Perceptually Guided Corrective Splatting

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Date
2001
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Journal ISSN
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Publisher
Blackwell Publishers Ltd and the Eurographics Association
Abstract
One of the basic difficulties with interactive walkthroughs is the high quality rendering of object surfaces with non-diffuse light scattering characteristics. Since full ray tracing at interactive rates is usually impossible, we render a precomputed global illumination solution using graphics hardware and use remaining computational power to correct the appearance of non-diffuse objects on-the-fly. The question arises, how to obtain the best image quality as perceived by a human observer within a limited amount of time for each frame. We address this problem by enforcing corrective computation for those non-diffuse objects that are selected using a computational model of visual attention. We consider both the saliency- and task-driven selection of those objects and benefit from the fact that shading artifacts of "unattended" objects are likely to remain unnoticed. We use a hierarchical image-space sampling scheme to control ray tracing and splat the generated point samples. The resulting image converges progressively to a ray traced solution if the viewing parameters remain unchanged. Moreover, we use a sample cache to enhance visual appearance if the time budget for correction has been too low for some frame. We check the validity of the cached samples using a novel criterion suited for non-diffuse surfaces and reproject valid samples into the current view.
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@article{
10.1111:1467-8659.00507
, journal = {Computer Graphics Forum}, title = {{
Perceptually Guided Corrective Splatting
}}, author = {
Haber, Jorg
and
Myszkowski, Karol
and
Yamauchi, Hitoshi
and
Seidel, Hans-Peter
}, year = {
2001
}, publisher = {
Blackwell Publishers Ltd and the Eurographics Association
}, ISSN = {
1467-8659
}, DOI = {
10.1111/1467-8659.00507
} }
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