@article{neumann-2006-gamma, title = "Accurate Display Gamma Functions based on Human Observation", author = "Attila Neumann and Alessandro Artusi and L\'{a}szl\'{o} Neumann and Georg Zotti and Werner Purgathofer", year = "2007", abstract = "This paper describes an accurate method to obtain the Tone Reproduction Curve (TRC) of display devices without using a measurement device. It is an improvement of an existing technique based on human observation, solving its problem of numerical instability and resulting in functions in log--log scale which correspond better to the nature of display devices. We demonstrate the effiency of our technique on different monitor technologies, comparing it with direct measurements using a spectrophotometer.", issn = "0361-2317", journal = "Color Research & Applications", note = "2006 angenommen, 2007 erschienen", number = "4", volume = "32", pages = "310--319", keywords = "Generalized Gamma Function, Colour Reproduction, Display Measurement, Human Visual System, Spatial Vision", URL = "https://www.cg.tuwien.ac.at/research/publications/2007/neumann-2006-gamma/", } @inproceedings{havran-2005-sccg, title = "On Cross-Validation and Resampling of BRDF Data Measurements", author = "Vlastimil Havran and Attila Neumann and Georg Zotti and Werner Purgathofer and Hans-Peter Seidel", year = "2005", abstract = "We discuss the validation of BTF data measurements by means used for BRDF measurements. First, we show how to apply the Helmholtz reciprocity and isotropy for a single data set. Second, we discuss a cross-validation for BRDF measurement data obtained from two different measurement setups, where the measurements are not calibrated or the level of accuracy is not known. We show the practical problems encountered and the solutions we have used to validate physical setup for four material samples. We describe a novel coordinate system suitable for resampling the BRDF data from one data set to another data set. Further, we show how the perceptually uniform color space CIELab is used for cross-comparison of BRDF data measurements, which were not calibrated.", month = may, location = "Budmerice, Slovakia", booktitle = "Proceedings SCCG 2005", pages = "161--168", keywords = "reflectance function, BRDF data acquisition, BRDF data validation, predictive rendering", URL = "https://www.cg.tuwien.ac.at/research/publications/2005/havran-2005-sccg/", } @inproceedings{zotti-2005-lum, title = "Approximating Real-World Luminaires with OpenGL Lights", author = "Georg Zotti and Attila Neumann and Werner Purgathofer", year = "2005", abstract = "Dynamic illumination in real-time applications using OpenGL is still usually done with the classical light forms of point lights, directional lights and spot lights. For applications simulating real-world scenes, e.g. architectural planning, finding parameter sets for these simple lights to match real-world luminaires is required for realistic work. This paper describes a simple approach to process a luminaire data file in IESNA IES-LM63-95 format to create an approximation using at most 2 OpenGL lights to represent one luminaire.", month = feb, isbn = "80-903100-9-5", publisher = "UNION press", organization = "University of West Bohemia", note = "only on conference CD-ROM", location = "Plzen", address = "Plzen", editor = "Vaclav Skala", booktitle = "WSCG 2005 Short Paper Proceedings", pages = "49--52", keywords = "interactive illumination planning, OpenGL, Real-world luminaires", URL = "https://www.cg.tuwien.ac.at/research/publications/2005/zotti-2005-lum/", } @techreport{Neumann-2004-HOB, title = "Human Observation Based Generalized Gamma Functions", author = "Attila Neumann and Alessandro Artusi and L\'{a}szl\'{o} Neumann and Georg Zotti and Werner Purgathofer", year = "2004", abstract = "This paper describes an accurate method to obtain the Tone Reproduction Curve (TRC) of display devices without using a measurement device. It is an improvement of an existing technique based on human observation, solving its problem of numerical instability and resulting in functions in log--log scale which correspond better to the nature of display devices. We demonstrate the effiency of our technique on different monitor technologies, comparing it with direct measurements using a spectrophotometer.", month = dec, number = "TR-186-2-04-13", address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria", institution = "Institute of Computer Graphics and Algorithms, Vienna University of Technology ", note = "human contact: technical-report@cg.tuwien.ac.at", keywords = "Display Measurement, Human Visual System, Spatial Vision", URL = "https://www.cg.tuwien.ac.at/research/publications/2004/Neumann-2004-HOB/", } @inproceedings{neumann-2004-ipm, title = "Interactive Perception Based Model for Characterization of Display device", author = "Attila Neumann and Alessandro Artusi and Georg Zotti and L\'{a}szl\'{o} Neumann and Werner Purgathofer", year = "2004", 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.", month = jan, isbn = "0819451967", organization = "IST&SPIE", location = "San Jose, California, USA", booktitle = "Color Imaging IX: Processing, Hardcopy, and Applications IX", keywords = "Display Measurement, Human Visual System", URL = "https://www.cg.tuwien.ac.at/research/publications/2004/neumann-2004-ipm/", } @talk{neumann-2004-aip, title = "aIPBMfCoDD", author = "Attila Neumann", year = "2004", event = "?", location = "San Jose", URL = "https://www.cg.tuwien.ac.at/research/publications/2004/neumann-2004-aip/", } @inproceedings{Neum04GCM, title = "Gamut Clipping and Mapping based on Coloroid System", author = "L\'{a}szl\'{o} Neumann and Attila Neumann", year = "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. After 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. The 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.", booktitle = "Proceedings of Second European Conference on Colour in Graphics, Imaging and Vision", pages = "548--555", keywords = "Coloroid Color System, Gamut Clipping, Gamut Mapping, Human Perception", URL = "https://www.cg.tuwien.ac.at/research/publications/2004/Neum04GCM/", } @inproceedings{Artusi-2003-Del, title = "Delivering Interactivity to Complex Tone Mapping Operators", author = "Alessandro Artusi and Jir\'{i} Bittner and Michael Wimmer and Alexander Wilkie", year = "2003", abstract = "The accurate display of high dynamic range images requires the application of complex tone mapping operators. These operators are computationally costly, which prevents their usage in interactive applications. We propose a general framework that delivers interactive performance to an important subclass of tone mapping operators, namely global tone mapping operators. The proposed framework consists of four steps: sampling the input image, applying the tone mapping operator, tting the point-sampled tone mapping curve, and reconstructing the tone mapping curve for all pixels of the input image. We show how to make use of recent graphics hardware while keeping the advantage of generality by performing tone mapping in software. We demonstrate the capabilities of our method by accelerating several common global tone mapping operators and integrating the operators in a real-time rendering application.", month = jun, isbn = "3-905673-03-7", publisher = "Eurographics Association", organization = "Eurographics", location = "Leuven, Belgium", editor = "Per Christensen and Daniel Cohen-Or", booktitle = "Rendering Techniques 2003 (Proceedings Eurographics Symposium on Rendering)", pages = "38--44", URL = "https://www.cg.tuwien.ac.at/research/publications/2003/Artusi-2003-Del/", } @inproceedings{Devlin-2002-STA, title = "STAR Report on Tone Reproduction and Physically Based Spectral Rendering", author = "K. Devlin and A. Chalmers and Alexander Wilkie and Werner Purgathofer", year = "2002", booktitle = "Eurographics 2002", publisher = "Eurographics Association", URL = "https://www.cg.tuwien.ac.at/research/publications/2002/Devlin-2002-STA/", }