IEEE Computer Graphics and Applications
Reverse engineering approach to appearance-based design of metallic and pearlescent paints
The Visual Computer: International Journal of Computer Graphics
Simulation of natural daylight illumination determined by a high dynamic range image
Programming and Computing Software
Proceedings of the 4th international conference on Computer graphics and interactive techniques in Australasia and Southeast Asia
Ldr2Hdr: on-the-fly reverse tone mapping of legacy video and photographs
ACM SIGGRAPH 2007 papers
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This paper considers the use of high dynamic range images as a source of natural daylight illumination in virtual scenes containing objects with complex optical properties (such as automotive multilayer paints). Physically justified algorithms for calculating the luminance of an object point and recognition of the sun to replace it by separate light source are outlined. An analysis of the correctness of the available high dynamic range images is performed, and their drawbacks are discussed. Two algorithms that allow to compensate the drawbacks of the representation of the visible sun in the high dynamic range images and thus perform a more accurate illumination simulation are proposed and elaborated. The correction of sun representation is based on the sky models adopted by the International Commission on Illumination (CIE). The modified illumination simulation algorithms make it possible to produce more accurate images. The algorithms are semi- automatic and robust with respect to errors in high dynamic range images. These algorithms are used in our computer graphics system for generating realistic images.