[ { "id": "neumann-2006-gamma", "type_id": "journalpaper_notalk", "tu_id": null, "repositum_id": null, "title": "Accurate Display Gamma Functions based on Human Observation", "date": "2007", "abstract": "This paper describes an accurate method to obtain the\nTone Reproduction Curve (TRC) of display devices without using\na measurement device. It is an improvement of an existing technique\nbased on human observation, solving its problem of numerical instability\nand resulting in functions in log--log scale which correspond better\nto the nature of display devices.\nWe demonstrate the effiency of our technique on different monitor\ntechnologies, comparing it with direct measurements using a\nspectrophotometer.", "authors_et_al": false, "substitute": null, "main_image": { "description": null, "filetitle": "image", "main_file": false, "use_in_gallery": false, "access": "public", "image_width": 300, "image_height": 280, "name": "neumann-2006-gamma-image.png", "type": "image/png", "size": 6781, "path": "Publication:neumann-2006-gamma", "url": "https://www.cg.tuwien.ac.at/research/publications/2007/neumann-2006-gamma/neumann-2006-gamma-image.png", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2007/neumann-2006-gamma/neumann-2006-gamma-image:thumb{{size}}.png" }, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 232, 191, 177, 222, 190 ], "issn": "0361-2317", "journal": "Color Research & Applications", "note": "2006 angenommen, 2007 erschienen", "number": "4", "pages_from": "310", "pages_to": "319", "volume": "32", "research_areas": [ "Rendering" ], "keywords": [ "Generalized Gamma Function", "Colour Reproduction", "Display Measurement", "Human Visual System", "Spatial Vision" ], "weblinks": [], "files": [ { "description": null, "filetitle": "image", "main_file": false, "use_in_gallery": false, "access": "public", "image_width": 300, "image_height": 280, "name": "neumann-2006-gamma-image.png", "type": "image/png", "size": 6781, "path": "Publication:neumann-2006-gamma", "url": "https://www.cg.tuwien.ac.at/research/publications/2007/neumann-2006-gamma/neumann-2006-gamma-image.png", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2007/neumann-2006-gamma/neumann-2006-gamma-image:thumb{{size}}.png" }, { "description": null, "filetitle": "paper", "main_file": false, "use_in_gallery": false, "access": "public", "name": "neumann-2006-gamma-paper.pdf", "type": "application/pdf", "size": 457864, "path": "Publication:neumann-2006-gamma", "url": "https://www.cg.tuwien.ac.at/research/publications/2007/neumann-2006-gamma/neumann-2006-gamma-paper.pdf", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2007/neumann-2006-gamma/neumann-2006-gamma-paper:thumb{{size}}.png" } ], "projects_workgroups": [ "realreflect" ], "url": "https://www.cg.tuwien.ac.at/research/publications/2007/neumann-2006-gamma/", "__class": "Publication" }, { "id": "TR-186-2-05-05", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Computational Color Harmony based on Coloroid System", "date": "2005-06", "abstract": "The paper presents experimentally based rules and methods creating harmonic color sets. Firstly, dichromatic rules will be presented which concern color harmony relationships of only two hues. For an arbitrarily given hue pair, we define the textit{just harmonic} saturation values, resulting in just harmonic color pairs. These values express the fuzzy border between harmony and disharmony regions by a single scalar, most appropriately. \n\nSecondly, the value of harmony will be defined corresponding to the textit{contrast of lightness}, i.e. the difference of perceptual lightness values. \nThirdly, we formulate the harmony value of the textit{saturation contrast}, depending on hue and lightness. Results of these investigations form a basis for a unified, \ncoherent dichromatic harmony formula as well as for analysis of polychromatic color harmony. \n\nIntroduced color harmony rules are based on Coloroid, which is one of the $5-6$ main color-order systems and furthermore it is an textit{aesthetically uniform} continuous color space. \nColoroid has simple closed forward and backward transformation formulas with the color space of $CIE~XYZ$. It relies on a huge number of observations and experiments, and it is a very suitable tool of color dynamics for describing aesthetical relationships. \nIt had supported also numerous color plans of great architectural projects \nhaving been realized in the practice. \nThe experimental data and information to be retrieved from them are \njust partly processed and published so far. Our article utilizes a 'slice' of this database, \ntogether with additional complementary observations. \nThis paper is an issue of a planned series of articles, dealing with rules and coherences of color harmony based on the Coloroid system. ", "authors_et_al": false, "substitute": null, "main_image": { "description": null, "filetitle": "image", "main_file": false, "use_in_gallery": true, "access": "public", "image_width": 443, "image_height": 458, "name": "TR-186-2-05-05-image.jpg", "type": "image/jpeg", "size": 53934, "path": "Publication:TR-186-2-05-05", "url": "https://www.cg.tuwien.ac.at/research/publications/2005/TR-186-2-05-05/TR-186-2-05-05-image.jpg", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2005/TR-186-2-05-05/TR-186-2-05-05-image:thumb{{size}}.png" }, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 177, 496, 232 ], "number": "TR-186-2-05-05", "research_areas": [], "keywords": [ "Color Dynamics", "Computational Aesthetics", "Coloroid", "Color Order System", "Color Harmony", "Environmental Color Design" ], "weblinks": [], "files": [ { "description": null, "filetitle": "Computational Color Harmony", "main_file": true, "use_in_gallery": false, "access": "public", "preview_image_width": 600, "preview_image_height": 600, "name": "TR-186-2-05-05-Computational Color Harmony.pdf", "type": "application/pdf", "size": 7263941, "path": "Publication:TR-186-2-05-05", "preview_name": "TR-186-2-05-05-Computational Color Harmony:preview.png", "preview_type": "image/jpeg", "preview_size": 227752, "url": "https://www.cg.tuwien.ac.at/research/publications/2005/TR-186-2-05-05/TR-186-2-05-05-Computational Color Harmony.pdf", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2005/TR-186-2-05-05/TR-186-2-05-05-Computational Color Harmony:thumb{{size}}.png" }, { "description": null, "filetitle": "image", "main_file": false, "use_in_gallery": true, "access": "public", "image_width": 443, "image_height": 458, "name": "TR-186-2-05-05-image.jpg", "type": "image/jpeg", "size": 53934, "path": "Publication:TR-186-2-05-05", "url": "https://www.cg.tuwien.ac.at/research/publications/2005/TR-186-2-05-05/TR-186-2-05-05-image.jpg", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2005/TR-186-2-05-05/TR-186-2-05-05-image:thumb{{size}}.png" } ], "projects_workgroups": [ "rend" ], "url": "https://www.cg.tuwien.ac.at/research/publications/2005/TR-186-2-05-05/", "__class": "Publication" }, { "id": "havran-2005-sccg", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "On Cross-Validation and Resampling of BRDF Data Measurements", "date": "2005-05", "abstract": "We discuss the validation of BTF data measurements by means used for\nBRDF measurements. First, we show how to apply the Helmholtz reciprocity\nand isotropy for a single data set. Second, we discuss a\ncross-validation for BRDF measurement data obtained from two different\nmeasurement setups, where the measurements are not calibrated or the\nlevel of accuracy is not known. We show the practical problems\nencountered and the solutions we have used to validate physical setup\nfor four material samples. We describe a novel coordinate system\nsuitable for resampling the BRDF data from one data set to another\ndata set. Further, we show how the perceptually uniform color space\nCIELab is used for cross-comparison of BRDF data measurements, which\nwere not calibrated.", "authors_et_al": false, "substitute": null, "main_image": { "description": null, "filetitle": "image", "main_file": false, "use_in_gallery": true, "access": "public", "image_width": 913, "image_height": 743, "name": "havran-2005-sccg-image.jpg", "type": "image/jpeg", "size": 84962, "path": "Publication:havran-2005-sccg", "url": "https://www.cg.tuwien.ac.at/research/publications/2005/havran-2005-sccg/havran-2005-sccg-image.jpg", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2005/havran-2005-sccg/havran-2005-sccg-image:thumb{{size}}.png" }, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 203, 232, 222, 190, 312 ], "booktitle": "Proceedings SCCG 2005", "date_from": "2005-05-12", "date_to": "2005-05-14", "lecturer": [ 203 ], "location": "Budmerice, Slovakia", "pages_from": "161", "pages_to": "168", "research_areas": [ "Rendering" ], "keywords": [ "reflectance function", "BRDF data acquisition", "BRDF data validation", "predictive rendering" ], "weblinks": [], "files": [ { "description": null, "filetitle": "", "main_file": true, "use_in_gallery": false, "access": "public", "name": "havran-2005-sccg-.pdf", "type": "application/pdf", "size": 2250090, "path": "Publication:havran-2005-sccg", "url": "https://www.cg.tuwien.ac.at/research/publications/2005/havran-2005-sccg/havran-2005-sccg-.pdf", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2005/havran-2005-sccg/havran-2005-sccg-:thumb{{size}}.png" }, { "description": null, "filetitle": "image", "main_file": false, "use_in_gallery": true, "access": "public", "image_width": 913, "image_height": 743, "name": "havran-2005-sccg-image.jpg", "type": "image/jpeg", "size": 84962, "path": "Publication:havran-2005-sccg", "url": "https://www.cg.tuwien.ac.at/research/publications/2005/havran-2005-sccg/havran-2005-sccg-image.jpg", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2005/havran-2005-sccg/havran-2005-sccg-image:thumb{{size}}.png" } ], "projects_workgroups": [ "realreflect" ], "url": "https://www.cg.tuwien.ac.at/research/publications/2005/havran-2005-sccg/", "__class": "Publication" }, { "id": "lneumann-2005-cch", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "Computational Color Harmony based on Coloroid System", "date": "2005-05", "abstract": "This paper presents experimentally based rules and methods for the creation of harmonic color sets. First, dichromatic\r\nrules are presented which concern the harmony relationships of two hues. For an arbitrarily given hue pair,\r\nwe de\u0002ne the just harmonic saturation values, resulting in minimally harmonic color pairs. These values express\r\nthe fuzzy border between harmony and disharmony regions using a single scalar.\r\nSecond, the value of harmony is de\u0002ned corresponding to the contrast of lightness, i.e. the difference of perceptual\r\nlightness values. Third, we formulate the harmony value of the saturation contrast, depending on hue and lightness.\r\nThe results of these investigations form a basis for a uni\u0002ed, coherent dichromatic harmony formula as well as for\r\nanalysis of polychromatic color harmony.\r\nIntroduced color harmony rules are based on Coloroid, which is one of the 5", "authors_et_al": false, "substitute": null, "main_image": { "description": null, "filetitle": "image", "main_file": false, "use_in_gallery": true, "access": "public", "image_width": 177, "image_height": 169, "name": "lneumann-2005-cch-image.jpg", "type": "image/jpeg", "size": 32185, "path": "Publication:lneumann-2005-cch", "url": "https://www.cg.tuwien.ac.at/research/publications/2005/lneumann-2005-cch/lneumann-2005-cch-image.jpg", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2005/lneumann-2005-cch/lneumann-2005-cch-image:thumb{{size}}.png" }, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 177, 496, 232 ], "booktitle": "Computational Aesthetics in Graphics, Visualization and Imaging 2005", "date_from": "2005-05-18", "date_to": "2005-05-20", "editor": "L. Neumann, M. Sbert, B. Gooch, W. Purgathofer", "isbn": "3905673274", "lecturer": [ 177 ], "location": "Girona, Spain", "pages_from": "231", "pages_to": "240", "research_areas": [], "keywords": [], "weblinks": [], "files": [ { "description": null, "filetitle": "image", "main_file": false, "use_in_gallery": true, "access": "public", "image_width": 177, "image_height": 169, "name": "lneumann-2005-cch-image.jpg", "type": "image/jpeg", "size": 32185, "path": "Publication:lneumann-2005-cch", "url": "https://www.cg.tuwien.ac.at/research/publications/2005/lneumann-2005-cch/lneumann-2005-cch-image.jpg", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2005/lneumann-2005-cch/lneumann-2005-cch-image:thumb{{size}}.png" }, { "description": null, "filetitle": "PDF", "main_file": true, "use_in_gallery": false, "access": "public", "name": "lneumann-2005-cch-PDF.pdf", "type": "application/pdf", "size": 14403655, "path": "Publication:lneumann-2005-cch", "url": "https://www.cg.tuwien.ac.at/research/publications/2005/lneumann-2005-cch/lneumann-2005-cch-PDF.pdf", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2005/lneumann-2005-cch/lneumann-2005-cch-PDF:thumb{{size}}.png" } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/2005/lneumann-2005-cch/", "__class": "Publication" }, { "id": "lneumann-2005-cst", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "Color Style Transfer Techniques using Hue, Lightness and Saturation Histogram Matching", "date": "2005-05", "abstract": "We present new methods which transfer the color style of a source image into an arbitrary given target image\r\nhaving a different 3D color distribution. The color transfer has a high importance ensuring a wide area of applications\r\nfrom artistic transformation of the color atmosphere of images until different scientific visualizations using\r\nspecial gamut mappings.\r\nOur technique use a permissive, or optionally strict, 3D histogram matching, similarly to the sampling of multivariable\r\nfunctions applying a sequential chain of conditional probability density functions. We work by order\r\nof hue, hue dependent lightness and from both dependent saturation histograms of source and target images, respectively.\r\nWe apply different histogram transformations, like smoothing or contrast limitation, in order to avoid\r\nsome unexpected high gradients and other artifacts. Furthermore, we use dominance suppression optionally, by\r\napplying sub-linear functions for the histograms in order to get well balanced color distributions, or an overall\r\nappearance reflecting the memory color distribution better. Forward and inverse operations on the corresponding\r\ncumulative histograms ensure a continuous mapping of perceptual attributes correlating to limited derivatives.\r\nSampling an appropriate fraction of the pixels and using perceptually accurate and continuous histograms with\r\nminimal size as well as other gems make this method robust and fast.", "authors_et_al": false, "substitute": null, "main_image": { "description": null, "filetitle": "image", "main_file": false, "use_in_gallery": true, "access": "public", "image_width": 198, "image_height": 197, "name": "lneumann-2005-cst-image.jpg", "type": "image/jpeg", "size": 37923, "path": "Publication:lneumann-2005-cst", "url": "https://www.cg.tuwien.ac.at/research/publications/2005/lneumann-2005-cst/lneumann-2005-cst-image.jpg", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2005/lneumann-2005-cst/lneumann-2005-cst-image:thumb{{size}}.png" }, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 177, 232 ], "booktitle": "Computational Aesthetics in Graphics, Visualization and Imaging 2005", "date_from": "2005-05-18", "date_to": "2005-05-20", "editor": "L. Neumann, M. Sbert, B. Gooch, W. Purgathofer", "isbn": "3905673274", "lecturer": [ 177 ], "location": "Girona, Spain", "pages_from": "111", "pages_to": "122", "research_areas": [], "keywords": [], "weblinks": [], "files": [ { "description": null, "filetitle": "image", "main_file": false, "use_in_gallery": true, "access": "public", "image_width": 198, "image_height": 197, "name": "lneumann-2005-cst-image.jpg", "type": "image/jpeg", "size": 37923, "path": "Publication:lneumann-2005-cst", "url": "https://www.cg.tuwien.ac.at/research/publications/2005/lneumann-2005-cst/lneumann-2005-cst-image.jpg", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2005/lneumann-2005-cst/lneumann-2005-cst-image:thumb{{size}}.png" }, { "description": null, "filetitle": "PDF", "main_file": true, "use_in_gallery": false, "access": "public", "name": "lneumann-2005-cst-PDF.pdf", "type": "application/pdf", "size": 29728853, "path": "Publication:lneumann-2005-cst", "url": "https://www.cg.tuwien.ac.at/research/publications/2005/lneumann-2005-cst/lneumann-2005-cst-PDF.pdf", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2005/lneumann-2005-cst/lneumann-2005-cst-PDF:thumb{{size}}.png" } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/2005/lneumann-2005-cst/", "__class": "Publication" }, { "id": "matkovic-2005-glo", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "Global Contrast Factor-a New Approach to Image Contrast", "date": "2005-05", "abstract": "Contrast in image processing is usually de\u0002ned as a ratio between the darkest and the brightest spots of an image.\r\nIn this paper we introduce a different contrast de\u0002nition. The newly introduced Global Contrast Factor (GCF)\r\ncorresponds closer to the human perception of contrast. GCF uses contrasts at various resolution levels in order\r\nto compute overall contrast. Experiments were conducted in order to \u0002nd weight factors needed to calculate GCF.\r\nGCF measures richness of detail as perceived by a human observer, and as such can be used in various application\r\nareas like rendering, tone mapping, volume visualization, and lighting design", "authors_et_al": false, "substitute": null, "main_image": { "description": null, "filetitle": "image", "main_file": false, "use_in_gallery": true, "access": "public", "image_width": 210, "image_height": 327, "name": "matkovic-2005-glo-image.jpg", "type": "image/jpeg", "size": 40112, "path": "Publication:matkovic-2005-glo", "url": "https://www.cg.tuwien.ac.at/research/publications/2005/matkovic-2005-glo/matkovic-2005-glo-image.jpg", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2005/matkovic-2005-glo/matkovic-2005-glo-image:thumb{{size}}.png" }, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 235, 177, 232, 26, 190 ], "booktitle": "Computational Aesthetics in Graphics, Visualization and Imaging 2005", "date_from": "2005-05-18", "date_to": "2005-05-20", "editor": "L. Neumann, M. Sbert, B. Gooch, W. Purgathofer", "isbn": "3905673274", "lecturer": [ 190 ], "location": "Girona, Spain", "pages_from": "159", "pages_to": "168", "publisher": "Eurographics Association", "research_areas": [], "keywords": [], "weblinks": [], "files": [ { "description": null, "filetitle": "image", "main_file": false, "use_in_gallery": true, "access": "public", "image_width": 210, "image_height": 327, "name": "matkovic-2005-glo-image.jpg", "type": "image/jpeg", "size": 40112, "path": "Publication:matkovic-2005-glo", "url": "https://www.cg.tuwien.ac.at/research/publications/2005/matkovic-2005-glo/matkovic-2005-glo-image.jpg", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2005/matkovic-2005-glo/matkovic-2005-glo-image:thumb{{size}}.png" }, { "description": null, "filetitle": "PDF", "main_file": true, "use_in_gallery": false, "access": "public", "name": "matkovic-2005-glo-PDF.pdf", "type": "application/pdf", "size": 1339337, "path": "Publication:matkovic-2005-glo", "url": "https://www.cg.tuwien.ac.at/research/publications/2005/matkovic-2005-glo/matkovic-2005-glo-PDF.pdf", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2005/matkovic-2005-glo/matkovic-2005-glo-PDF:thumb{{size}}.png" } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/2005/matkovic-2005-glo/", "__class": "Publication" }, { "id": "zotti-2005-lum", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "Approximating Real-World Luminaires with OpenGL Lights", "date": "2005-02", "abstract": "Dynamic illumination in real-time applications using OpenGL is still usually done with the classical light forms of point lights, directional\n lights and spot lights. For applications simulating real-world\n scenes, e.g. architectural planning, finding parameter sets for\n these simple lights to match real-world luminaires is required for\n realistic work. This paper describes a simple approach to\n process a luminaire data file in IESNA IES-LM63-95 format to create\n an approximation using at most 2 OpenGL lights to represent one\n luminaire.", "authors_et_al": false, "substitute": null, "main_image": { "description": null, "filetitle": "image", "main_file": false, "use_in_gallery": true, "access": "public", "image_width": 1072, "image_height": 860, "name": "zotti-2005-lum-image.jpg", "type": "image/jpeg", "size": 140201, "path": "Publication:zotti-2005-lum", "url": "https://www.cg.tuwien.ac.at/research/publications/2005/zotti-2005-lum/zotti-2005-lum-image.jpg", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2005/zotti-2005-lum/zotti-2005-lum-image:thumb{{size}}.png" }, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 222, 232, 190 ], "address": "Plzen", "booktitle": "WSCG 2005 Short Paper Proceedings", "date_from": "2005-02-01", "date_to": "2005-02-03", "editor": "Vaclav Skala", "isbn": "80-903100-9-5", "location": "Plzen", "note": "only on conference CD-ROM", "organization": "University of West Bohemia", "pages_from": "49", "pages_to": "52", "publisher": "UNION press", "research_areas": [ "Rendering" ], "keywords": [ "interactive illumination planning", "OpenGL", "Real-world luminaires" ], "weblinks": [], "files": [ { "description": null, "filetitle": "", "main_file": true, "use_in_gallery": false, "access": "public", "name": "zotti-2005-lum-.pdf", "type": "application/pdf", "size": 561509, "path": "Publication:zotti-2005-lum", "url": "https://www.cg.tuwien.ac.at/research/publications/2005/zotti-2005-lum/zotti-2005-lum-.pdf", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2005/zotti-2005-lum/zotti-2005-lum-:thumb{{size}}.png" }, { "description": null, "filetitle": "image", "main_file": false, "use_in_gallery": true, "access": "public", "image_width": 1072, "image_height": 860, "name": "zotti-2005-lum-image.jpg", "type": "image/jpeg", "size": 140201, "path": "Publication:zotti-2005-lum", "url": "https://www.cg.tuwien.ac.at/research/publications/2005/zotti-2005-lum/zotti-2005-lum-image.jpg", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2005/zotti-2005-lum/zotti-2005-lum-image:thumb{{size}}.png" } ], "projects_workgroups": [ "realreflect" ], "url": "https://www.cg.tuwien.ac.at/research/publications/2005/zotti-2005-lum/", "__class": "Publication" }, { "id": "Neum04Hig", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "High-resolution Depth and Reflectance Map Estimation in Underwater Imaging", "date": "2004-12", "abstract": "This paper describes \r\na novel technique to simultaneously determining the threedimensional\r\ngeometry and reflectance map of a scene in underwater\r\nimaging. Underwater light is affected\r\nby an exponential wavelenght-dependent absorption\r\nand undesired scattering effects. These special conditions\r\nmake image and video processing a difficult task in participating\r\nmedia. It is shown how to use this disturbing\r\nabsorption effect to find a new way to accurately estimate\r\nthe scene depth-map and multispectral reflectivities.\r\nThe process requires the acquisition of a multispectral image\r\nof the underwater scenario with the appropriate camera\r\nand lightsource arrangement. The algorithm has been tested\r\non several synthetic images for different noise levels. The\r\npromising results show that the technique provides accurate\r\nand stable results.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 177, 460, 461, 232 ], "number": "TR-186-2-04-14", "research_areas": [], "keywords": [ "Underwater Imaging", "Depth Map" ], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/2004/Neum04Hig/", "__class": "Publication" }, { "id": "Neumann-2004-HOB", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Human Observation Based Generalized Gamma Functions", "date": "2004-12", "abstract": "This paper describes an accurate method to obtain the\nTone Reproduction Curve (TRC) of display devices without using\na measurement device. It is an improvement of an existing technique\nbased on human observation, solving its problem of numerical instability\nand resulting in functions in log--log scale which correspond better\nto the nature of display devices.\nWe demonstrate the effiency of our technique on different monitor\ntechnologies, comparing it with direct measurements using a\nspectrophotometer.", "authors_et_al": false, "substitute": null, "main_image": { "description": null, "filetitle": "", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Neumann-2004-HOB-.pdf", "type": "application/pdf", "size": 205123, "path": "Publication:Neumann-2004-HOB", "url": "https://www.cg.tuwien.ac.at/research/publications/2004/Neumann-2004-HOB/Neumann-2004-HOB-.pdf", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2004/Neumann-2004-HOB/Neumann-2004-HOB-:thumb{{size}}.png" }, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 232, 191, 177, 222, 190 ], "number": "TR-186-2-04-13", "research_areas": [], "keywords": [ "Display Measurement", "Human Visual System", "Spatial Vision" ], "weblinks": [], "files": [ { "description": null, "filetitle": "", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Neumann-2004-HOB-.pdf", "type": "application/pdf", "size": 205123, "path": "Publication:Neumann-2004-HOB", "url": "https://www.cg.tuwien.ac.at/research/publications/2004/Neumann-2004-HOB/Neumann-2004-HOB-.pdf", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2004/Neumann-2004-HOB/Neumann-2004-HOB-:thumb{{size}}.png" } ], "projects_workgroups": [ "realreflect" ], "url": "https://www.cg.tuwien.ac.at/research/publications/2004/Neumann-2004-HOB/", "__class": "Publication" }, { "id": "neumann-2004-ipm", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "Interactive Perception Based Model for Characterization of Display device", "date": "2004-01", "abstract": "This paper describes a simple to use, yet accurate way to obtain the Tone Reproduction Curve (TRC) of display devices without the use of a measurement device. Human vision is used to compare a series of dithered color patches against interactively changeable homogeneously colored display areas. Results comparing this method with spectrophotometer measurements are given for three monitors.", "authors_et_al": false, "substitute": null, "main_image": { "description": null, "filetitle": "image", "main_file": false, "use_in_gallery": true, "access": "public", "image_width": 300, "image_height": 300, "name": "neumann-2004-ipm-image.jpg", "type": "image/jpeg", "size": 8374, "path": "Publication:neumann-2004-ipm", "url": "https://www.cg.tuwien.ac.at/research/publications/2004/neumann-2004-ipm/neumann-2004-ipm-image.jpg", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2004/neumann-2004-ipm/neumann-2004-ipm-image:thumb{{size}}.png" }, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 232, 191, 222, 177, 190 ], "booktitle": "Color Imaging IX: Processing, Hardcopy, and Applications IX", "isbn": "0819451967", "location": "San Jose, California, USA", "organization": "IST&SPIE", "research_areas": [], "keywords": [ "Display Measurement", "Human Visual System" ], "weblinks": [], "files": [ { "description": null, "filetitle": "image", "main_file": false, "use_in_gallery": true, "access": "public", "image_width": 300, "image_height": 300, "name": "neumann-2004-ipm-image.jpg", "type": "image/jpeg", "size": 8374, "path": "Publication:neumann-2004-ipm", "url": "https://www.cg.tuwien.ac.at/research/publications/2004/neumann-2004-ipm/neumann-2004-ipm-image.jpg", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2004/neumann-2004-ipm/neumann-2004-ipm-image:thumb{{size}}.png" }, { "description": null, "filetitle": "Interactive Perception Based Display Characterization", "main_file": true, "use_in_gallery": false, "access": "public", "name": "neumann-2004-ipm-Interactive Perception Based Display Characterization.pdf", "type": "application/pdf", "size": 479599, "path": "Publication:neumann-2004-ipm", "url": "https://www.cg.tuwien.ac.at/research/publications/2004/neumann-2004-ipm/neumann-2004-ipm-Interactive Perception Based Display Characterization.pdf", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2004/neumann-2004-ipm/neumann-2004-ipm-Interactive Perception Based Display Characterization:thumb{{size}}.png" } ], "projects_workgroups": [ "realreflect" ], "url": "https://www.cg.tuwien.ac.at/research/publications/2004/neumann-2004-ipm/", "__class": "Publication" }, { "id": "neumann-2004-aip", "type_id": "talk", "tu_id": null, "repositum_id": null, "title": "aIPBMfCoDD", "date": "2004", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 232 ], "date_from": "2004-01-15", "event": "?", "location": "San Jose", "research_areas": [], "keywords": [], "weblinks": [], "files": [ { "description": "", "filetitle": "slides", "main_file": true, "use_in_gallery": false, "access": "public", "name": "neumann-2004-aip-slides.ppt", "type": "application/msword", "size": 524800, "path": "Publication:neumann-2004-aip", "url": "https://www.cg.tuwien.ac.at/research/publications/2004/neumann-2004-aip/neumann-2004-aip-slides.ppt", "thumb_image_sizes": [] } ], "projects_workgroups": [ "realreflect" ], "url": "https://www.cg.tuwien.ac.at/research/publications/2004/neumann-2004-aip/", "__class": "Publication" }, { "id": "Neum04GCM", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "Gamut Clipping and Mapping based on Coloroid System", "date": "2004", "abstract": "The paper presents novel techniques based on the Coloroid color system which hitherto has not been applied to gamut mapping. The introduced methods described are hue preserving and use three gravity centers in a hue-dependent way. Two of the gravity centers are shifted toward the direction of ‘negative saturation’, and can be used for regions of bright and dark colors, while a third gravity center is used for saturated colors. \r\nAfter a short survey of gamut mapping an introduction to the Coloroid describes concisely its features and formulas. Then a simple color clipping rule is presented applicable to any rendering applications. A gamut mapping method will be defined mapping from a generic input image to an RGB display. Other variations of the method describe RGB-CYMK transformation and also cross-media mapping for known input and output gamut boundaries. \r\nThe introduced methods apply hue and chroma dependent lightness compression. They can be applied in realistic computer graphics and digital photography as well as in printing technologies. They are straightforward to implement and have low computational costs.", "authors_et_al": false, "substitute": null, "main_image": { "description": null, "filetitle": "image", "main_file": false, "use_in_gallery": true, "access": "public", "image_width": 600, "image_height": 600, "name": "Neum04GCM-image.jpg", "type": "image/jpeg", "size": 93650, "path": "Publication:Neum04GCM", "url": "https://www.cg.tuwien.ac.at/research/publications/2004/Neum04GCM/Neum04GCM-image.jpg", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2004/Neum04GCM/Neum04GCM-image:thumb{{size}}.png" }, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 177, 232 ], "booktitle": "Proceedings of Second European Conference on Colour in Graphics, Imaging and Vision", "pages_from": "548", "pages_to": "555", "research_areas": [], "keywords": [ "Coloroid Color System", "Gamut Clipping", "Gamut Mapping", "Human Perception" ], "weblinks": [], "files": [ { "description": null, "filetitle": "Gamut Clipping and Mapping", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Neum04GCM-Gamut Clipping and Mapping.pdf", "type": "application/pdf", "size": 434136, "path": "Publication:Neum04GCM", "url": "https://www.cg.tuwien.ac.at/research/publications/2004/Neum04GCM/Neum04GCM-Gamut Clipping and Mapping.pdf", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2004/Neum04GCM/Neum04GCM-Gamut Clipping and Mapping:thumb{{size}}.png" }, { "description": null, "filetitle": "image", "main_file": false, "use_in_gallery": true, "access": "public", "image_width": 600, "image_height": 600, "name": "Neum04GCM-image.jpg", "type": "image/jpeg", "size": 93650, "path": "Publication:Neum04GCM", "url": "https://www.cg.tuwien.ac.at/research/publications/2004/Neum04GCM/Neum04GCM-image.jpg", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2004/Neum04GCM/Neum04GCM-image:thumb{{size}}.png" } ], "projects_workgroups": [ "realreflect" ], "url": "https://www.cg.tuwien.ac.at/research/publications/2004/Neum04GCM/", "__class": "Publication" }, { "id": "Redey-2004-SRLR", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "Self-referencing languages revisited", "date": "2004", "abstract": "Paradoxes, particularly Tarski's liar paradox, represent an ongoing challenge have long attracted special interest. There have been numerous attempts to give either a formal or a more realistic resolution to this area based on natural logical intuition or\ncommon sense. \n\nThe present semantic analysis of the problem components concludes that the traditional language of logic fails to detect Tarski's paradox, since the formalised version of a liar sentence does not represent a correct definition. Neither the formal language, nor the logical system is deficient in this respect. Only natural language statements cannot be interpreted adequately by traditional language of logic. ", "authors_et_al": false, "substitute": null, "main_image": { "description": null, "filetitle": "", "main_file": false, "use_in_gallery": false, "access": "public", "name": "Redey-2004-SRLR-.pdf", "type": "application/pdf", "size": 108117, "path": "Publication:Redey-2004-SRLR", "url": "https://www.cg.tuwien.ac.at/research/publications/2004/Redey-2004-SRLR/Redey-2004-SRLR-.pdf", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2004/Redey-2004-SRLR/Redey-2004-SRLR-:thumb{{size}}.png" }, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 478, 232 ], "booktitle": "Proceedings of the First Workshop on Philosophy and Informatics (WSPI 2004)", "date_from": "2004-03", "editor": "Büchel, G, Klein, B", "location": "Cologne", "pages_from": "105", "pages_to": "111", "research_areas": [], "keywords": [ "Tarski paradox", "Language of logic" ], "weblinks": [], "files": [ { "description": null, "filetitle": "", "main_file": false, "use_in_gallery": false, "access": "public", "name": "Redey-2004-SRLR-.pdf", "type": "application/pdf", "size": 108117, "path": "Publication:Redey-2004-SRLR", "url": "https://www.cg.tuwien.ac.at/research/publications/2004/Redey-2004-SRLR/Redey-2004-SRLR-.pdf", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2004/Redey-2004-SRLR/Redey-2004-SRLR-:thumb{{size}}.png" } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/2004/Redey-2004-SRLR/", "__class": "Publication" }, { "id": "neumann-2003-color", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "Color Appearance in Multispectral Radiosity", "date": "2003", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": { "description": null, "filetitle": "image", "main_file": false, "use_in_gallery": true, "access": "public", "image_width": 418, "image_height": 395, "name": "neumann-2003-color-image.jpg", "type": "image/jpeg", "size": 36189, "path": "Publication:neumann-2003-color", "url": "https://www.cg.tuwien.ac.at/research/publications/2003/neumann-2003-color/neumann-2003-color-image.jpg", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2003/neumann-2003-color/neumann-2003-color-image:thumb{{size}}.png" }, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 177, 457, 232, 207 ], "booktitle": "Proceedings on the 2nd Hungarian Computergraphics and Geometry Conference", "editor": "L. Szirmay-Kalos, G. Renner", "isbn": "9634207669", "pages_from": "183", "pages_to": "194", "research_areas": [], "keywords": [], "weblinks": [], "files": [ { "description": null, "filetitle": "image", "main_file": false, "use_in_gallery": true, "access": "public", "image_width": 418, "image_height": 395, "name": "neumann-2003-color-image.jpg", "type": "image/jpeg", "size": 36189, "path": "Publication:neumann-2003-color", "url": "https://www.cg.tuwien.ac.at/research/publications/2003/neumann-2003-color/neumann-2003-color-image.jpg", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2003/neumann-2003-color/neumann-2003-color-image:thumb{{size}}.png" }, { "description": null, "filetitle": "PDF", "main_file": true, "use_in_gallery": false, "access": "public", "name": "neumann-2003-color-PDF.pdf", "type": "application/pdf", "size": 485386, "path": "Publication:neumann-2003-color", "url": "https://www.cg.tuwien.ac.at/research/publications/2003/neumann-2003-color/neumann-2003-color-PDF.pdf", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2003/neumann-2003-color/neumann-2003-color-PDF:thumb{{size}}.png" } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/2003/neumann-2003-color/", "__class": "Publication" }, { "id": "xmas-2002", "type_id": "xmascard", "tu_id": null, "repositum_id": null, "title": "X-Mas 2002", "date": "2002", "abstract": "Der Blick auf Wien wurde Hartmann Schedels Weltchronik (1493) entnommen.\r\n\r\nDas Motiv \"Die Könige folgen dem Stern\" findet sich im Atlas Catalan der Bibliothèque Nationale de France (14. Jahrhundert). Es wurde für die Karte etwas überarbeitet.\r\n\r\nDie drei Buchstaben stehen für die Initialen der Magoi (gr.: Meister).\r\n\r\nDer Himmel basiert auf einem Screenshot von VRMoSS, dem Virtual Reality Model of the Solar System, entwickelt für das EU-Projekt \"ASH\" (http://www.ashproject.org, jetzt http://www.virtualcontrolroom.org). Es stellt den Blick auf den abendlichen Westhimmel im November des Jahres 7 v.u.Z. dar, an dem eine Konjunktion von Jupiter (Königsstern der chaldäischen Astrologie) und Saturn (Stern der Juden) vor dem Hintergrund der Fische (der Region Palästina zugeordnet) sichtbar war. Dieses Ereignis ist eine der besten natürlichen Erklärungen für den Biblischen \"Stern der Weisen\". Die Planeten sind stark vergrößert dargestellt. Der Lichtkegel des Zodiakallichts (an interplanetarem Staub gestreutes Sonnenlicht) wurde während der Nachbearbeitung eingefügt.\r\n\r\nDas Gesamtbild wurde mit GIMP, dem freien GNU Image Manipulation Programm, erstellt. \r\n\r\nIdee, Materialien: Attila Neumann, Georg Zotti, Alexander Wilkie und andere.\r\nVRMoSS, Ausführung: Georg Zotti (2002) \r\n\r\n\r\nThe lower part of the image is a woodcut of Vienna taken from Hartmann Schedel's Chronicle Of The World (1493).\r\n\r\nThe image \"The Kings Follow the Star\" was taken from the Atlas Catalan, Bibliothèque Nationale de France (14th Century) and slightly modified. According to central European tradition, one of the kings was a Moor.\r\n\r\nThe three letters represent the initials of the Magi (gr.: Master).\r\n\r\nThe sky image is a screenshot from VRMoSS (Virtual Reality Model of the Solar System), developed at our institute for the EU project \"ASH\" (http://www.ashproject.org, now http://www.virtualcontrolroom.org). It represents the evening sky of mid-November of the year 7 B.C.E., showing the close conjunction of Jupiter (star of the kings in Chaldean astrology) and Saturn (star of the Jews) - both greatly enlarged - in the constellation of Pisces (the fishes; related to Palestine), which is one of the best natural explanations of the biblical story of the star followed by the magi (\"wise men\" or \"kings\"). The light cone of the Zodiacal Light (sunlight reflected by dust in the Solar System) has been added during the postprocessing.\r\n\r\nThe image has been composed with GIMP, the free GNU Image Manipulation Program.\r\n\r\nIdea, material: Attila Neumann, Georg Zotti, Alexander Wilkie, and others.\r\nVRMoSS, artwork: Georg Zotti (2002) ", "authors_et_al": false, "substitute": null, "main_image": { "description": "", "filetitle": "image", "main_file": false, "use_in_gallery": true, "access": "public", "image_width": 1280, "image_height": 995, "name": "xmas-2002-image.tif", "type": "image/tiff", "size": 2032078, "path": "Publication:xmas-2002", "url": "https://www.cg.tuwien.ac.at/research/publications/2002/xmas-2002/xmas-2002-image.tif", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2002/xmas-2002/xmas-2002-image:thumb{{size}}.png" }, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 222, 232, 192 ], "research_areas": [], "keywords": [], "weblinks": [], "files": [ { "description": "", "filetitle": "image", "main_file": false, "use_in_gallery": true, "access": "public", "image_width": 1280, "image_height": 995, "name": "xmas-2002-image.tif", "type": "image/tiff", "size": 2032078, "path": "Publication:xmas-2002", "url": "https://www.cg.tuwien.ac.at/research/publications/2002/xmas-2002/xmas-2002-image.tif", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2002/xmas-2002/xmas-2002-image:thumb{{size}}.png" } ], "projects_workgroups": [ "xmas" ], "url": "https://www.cg.tuwien.ac.at/research/publications/2002/xmas-2002/", "__class": "Publication" }, { "id": "Neumann-thesis", "type_id": "phdthesis", "tu_id": null, "repositum_id": null, "title": "Constructions of Bidirectional Reflection Distribution Functions", "date": "2001", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 232 ], "date_end": "2001-06", "date_start": "1997-12", "supervisor": [ 190 ], "research_areas": [], "keywords": [], "weblinks": [], "files": [ { "description": "", "filetitle": "pdf", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Neumann-thesis-pdf.pdf", "type": "application/pdf", "size": 5132370, "path": "Publication:Neumann-thesis", "url": "https://www.cg.tuwien.ac.at/research/publications/2001/Neumann-thesis/Neumann-thesis-pdf.pdf", "thumb_image_sizes": [ 16, 64, 100, 175, 300, 600 ], "thumb_url": "https://www.cg.tuwien.ac.at/research/publications/2001/Neumann-thesis/Neumann-thesis-pdf:thumb{{size}}.png" } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/2001/Neumann-thesis/", "__class": "Publication" }, { "id": "Szir-1998-Pump", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Analysis and Pumping of the Albedo Function", "date": "1998-07", "abstract": "The paper\nintroduces a method, called the albedo pumping-up, to derive\nnew, physically plausible BRDFs from an existing\none or from any symmetric function.\nThis operation can be applied recursively\nby arbitrary number of times. An important application\nof this operation is the transformation of the Phong and\nBlinn models in order to make them produce\nmetallic effects.\nThe paper also examines the albedo function\nof reflectance models and comes to the conclusion\nthat widely used models violate\nenergy balance at grazing angles.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 177, 232, 206 ], "number": "TR-186-2-98-20", "pages_from": "1", "pages_to": "13", "research_areas": [], "keywords": [ "perceptual based fitting", "metal models", "energy balance", "albedo function", "BRDF representation", "Reflectance function" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Szir-1998-Pump-paper.gz", "type": "application/octet-stream", "size": 530217, "path": "Publication:Szir-1998-Pump", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Szir-1998-Pump/Szir-1998-Pump-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Szir-1998-Pump/", "__class": "Publication" }, { "id": "Szir-1998-Ref", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "New Simple Reflectance Models for Metals and other Specular Materia\nls", "date": "1998-07", "abstract": "The paper presents new, simple and physically\nplausible, but not physically based reflectance models for\nmetals and other specular materials. The\nmost important member of this family is the modification\nof the Phong model, which can eliminate its\nnon-metallic characteristics. The new model gives back the\nideal mirror in\nthe limit case, is easier to compute than other known models\nand is particularly suitable for importance sampling to\nefficiently generate reflected directions\nin Monte-Carlo ray-tracing algorithms.\nDue to its simplicity, the new\nmodel can become an integral part of commercial CAD systems to\ndescribe the specular part or metallic behavior.\nThe paper also examines the energy balance of the previously\nknown and the newly proposed BRDFs concentrating on the behavior\nat grazing angles, and comes to the conclusion that the Ward and\nthe Cook-Torrance models cannot guarantee energy balance and thus\nare not physically plausible. Finally, the generated images\ndemonstrate how the metallic impression can be provided by the\nnew models.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 177, 232, 206 ], "number": "TR-186-2-98-17", "pages_from": "1", "pages_to": "15", "research_areas": [], "keywords": [ "importance sampling", "albedo function", "BRDF representation", "Reflectance function" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Szir-1998-Ref-paper.gz", "type": "application/octet-stream", "size": 2964360, "path": "Publication:Szir-1998-Ref", "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Szir-1998-Ref/Szir-1998-Ref-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Szir-1998-Ref/", "__class": "Publication" }, { "id": "Neumann-1998-Inc", "type_id": "misc", "tu_id": null, "repositum_id": null, "title": "Incident Light Metering in Computer Graphics", "date": "1998", "abstract": null, "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 177, 190, 232, 235 ], "note": "In Computer Graphics Forum 17(4), pp. 235-247, Blackwell, Oxford, December 1998.", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Neumann-1998-Inc/", "__class": "Publication" }, { "id": "Neumann-1998-The", "type_id": "misc", "tu_id": null, "repositum_id": null, "title": "The Constant Radiance Term", "date": "1998", "abstract": null, "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 177, 190, 199, 232 ], "note": "In Machine, Graphics and Vision, No. 7(3), pp.535-549, Polish Academy of Sciences, Warsaw, 1998.", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1998/Neumann-1998-The/", "__class": "Publication" }, { "id": "Kresimir-1997-ILMCG", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "Incident Light Metering in Computer Graphics", "date": "1997-04", "abstract": "Every rendering process consists of two steps. The\nfirst is the computing of luminance values by methods like ray tracing\nor radiosity, and the second step is the mapping of the computed\nvalues to values appropriate for displaying. In the last years, as\nalternative to simple linear scaling which maps the average value to\nthe medium lumninance, some new ways of mapping were introduced. These\nnew methods are based on photography analogies and on human vision\nmodels. All existing methods follow, implicitly or explicitly, the\nreflected light metering principle. The method introduced in this\npaper is the first that follows the incident light metering used in\nprofessional photography and in the movie industry. Actually the\nirradiances are measured using a set of diffusors, which are placed\nautomatically in the scene, and a linear scale factor based on these\nmeasurements is used to map the computed radiances to the display\ndevice. The diffusors act as half space integrators, they collect the\nlight energy from all half space directions. The light comes from the\nprimary light sources, or it is the result of various\ninterreflections. The newly introduced method reproduces original\ncolors faithfully even for scenes with very low or very high average\nreflectivity.Every rendering process consists of two steps. The first\nis the computing of luminance values by methods like ray tracing or\nradiosity, and the second step is the mapping of the computed values\nto values appropriate for displaying. In the last years, as\nalternative to simple linear scaling which maps the average value to\nthe medium lumninance, some new ways of mapping were introduced. These\nnew methods are based on photography analogies and on human vision\nmodels. All existing methods follow, implicitly or explicitly, the\nreflected light metering principle. The method introduced in this\npaper is the first that follows the incident light metering used in\nprofessional photography and in the movie industry. Actually the\nirradiances are measured using a set of diffusors, which are placed\nautomatically in the scene, and a linear scale factor based on these\nmeasurements is used to map the computed radiances to the display\ndevice. The diffusors act as half space integrators, they collect the\nlight energy from all half space directions. The light comes from the\nprimary light sources, or it is the result of various\ninterreflections. The newly introduced method reproduces original\ncolors faithfully even for scenes with very low or very high average\nreflectivity.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 235, 177, 232, 190 ], "number": "TR-186-2-97-11", "pages_from": "1", "pages_to": "9", "research_areas": [], "keywords": [ "color mapping", "global illumination", "tone mapping" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Kresimir-1997-ILMCG-paper.gz", "type": "application/octet-stream", "size": 6155740, "path": "Publication:Kresimir-1997-ILMCG", "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Kresimir-1997-ILMCG/Kresimir-1997-ILMCG-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1997/Kresimir-1997-ILMCG/", "__class": "Publication" }, { "id": "Neumann-1996-NCB", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "A New Class of BRDF Models with Fast Importance Sampling", "date": "1996-12", "abstract": "We introduce a physically plausible mathematical model\nfor a large class of BRDFs. The new model can be defined\nin a user-friendly way and it is as simple as the\nwell-known Phong model, without any of its disadvantages.\nIt gives a good visual approximation of a lot of practical\nmaterials: metals, plastics, ceramics, retro-reflective\npaints, anisotropic materials, etc. The new model includes\nthe ideal diffuse model and ideal mirror as well, reflecting\nall of the incoming energy. Because of its illustrative\nproperties it can be used easily in most commercial\nsoftware and because of its low computational cost it is\n practical for VR.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 177, 232 ], "number": "TR-186-2-96-24", "pages_from": "1", "pages_to": "25", "research_areas": [], "keywords": [ "rendering", "reflection models", "anisotropy", "retro-reflective models", "BRDF", "albedo", "Monte Carlo", "imporance sampling" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Neumann-1996-NCB-paper.gz", "type": "application/octet-stream", "size": 176434, "path": "Publication:Neumann-1996-NCB", "url": "https://www.cg.tuwien.ac.at/research/publications/1996/Neumann-1996-NCB/Neumann-1996-NCB-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1996/Neumann-1996-NCB/", "__class": "Publication" }, { "id": "elias-1995-view", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "View Dependent Solution for Monte Carlo Progressive Refinement Radiosity", "date": "1995-05", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 439, 232, 190 ], "booktitle": "Proceedings of 11th Spring Conference on Computer Graphics", "date_from": "1995-05-29", "date_to": "1995-06-03", "location": "Bratislava, Slovakia", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/elias-1995-view/", "__class": "Publication" }, { "id": "Neumann-1995-SRM", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "The Stochastic Ray Method for Radiosity", "date": "1995-01", "abstract": "This paper solves the system of radiosity\nequations with a numerical approach rather than\nwith a physical interpretation as most current\nalgorithms do. Due to the high complexity of the\nproblem for highly complex scenes, a stochastic\nvariation of Jacobi iteration is developed which\nconverges stochastically to the correct solution.\nThe new method, called Stochastic Ray Method, is a\nsignificant improvement of Stochastic Radiosity. A\nlarge number of independent rays is chosen\nstochastically by importance sampling of the\npatches according to their power after the previous\niteration step. They all carry an equal amount of\npower into random directions, thereby representing\ntogether the total energy interreflection of the\nentire environment in a stochastic manner.\nAssuming a correctly distributed initial solution,\nwhich can be reached easily, the iteration\nprocess converges quickly and reduces the error\nin the result faster than other stochastic\nradiosity approaches. The new algorithm can\neasily be extended to treat various phenomena which\nare normally rather costly to incorporate in\nradiosity environments: specular reflection and\nspecular transmittance, non-diffuse emission and\n point light sources.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 177, 190, 216, 232, 439, 245, 440 ], "number": "TR-186-2-95-3", "pages_from": "1", "pages_to": "8", "research_areas": [], "keywords": [ "rendering", "radiosity", "stochastic", "raytracing" ], "weblinks": [], "files": [ { "description": null, "filetitle": "paper", "main_file": true, "use_in_gallery": false, "access": "public", "name": "Neumann-1995-SRM-paper.gz", "type": "application/octet-stream", "size": 55968, "path": "Publication:Neumann-1995-SRM", "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Neumann-1995-SRM/Neumann-1995-SRM-paper.gz", "thumb_image_sizes": [] } ], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/Neumann-1995-SRM/", "__class": "Publication" }, { "id": "neumann-1995-the", "type_id": "inproceedings", "tu_id": null, "repositum_id": null, "title": "The Stochastic Ray Method for Radiosity", "date": "1995", "abstract": "", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 177, 190, 216, 232, 439, 245, 440 ], "booktitle": "Rendering Techniques", "editor": "P. Hanrahan, W. Purgathofer", "location": "Wien, Austria", "note": "TALK: M. Feda 13.5.1995", "research_areas": [], "keywords": [], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1995/neumann-1995-the/", "__class": "Publication" }, { "id": "Neumann-1994-SRM", "type_id": "techreport", "tu_id": null, "repositum_id": null, "title": "The Stochastic Ray Method for Radiosity", "date": "1994-11", "abstract": "THIS TECHNICAL REPORT IS OUTDATED AND HAS BEEN SUPERSEDED BY TR-186-2-95-3.\nThis paper presents an efficient radiosity\nalgorithm for highly complex scenes. The new\niteration method, which is based on the Stochastic\nShooting Method, uses ray tracing to implicitly\ncalculate form factors. The variance in the solution\nis reduced by using a self-correcting, stochastically\nconverging iteration formula. The new algorithm can\nbe easily extended to simulate various phenomena\nnormally not found in radiosity environments:\ntransparency, specular reflection and point\n light-sources.", "authors_et_al": false, "substitute": null, "main_image": null, "sync_repositum_override": null, "repositum_presentation_id": null, "authors": [ 177, 190, 216, 232, 439, 245, 440 ], "number": "TR-186-2-94-17", "pages_from": "1", "pages_to": "13", "research_areas": [], "keywords": [ "" ], "weblinks": [], "files": [], "projects_workgroups": [], "url": "https://www.cg.tuwien.ac.at/research/publications/1994/Neumann-1994-SRM/", "__class": "Publication" } ]