Perceptually Guided Corrective Splatting
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 hardw...
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| Vydáno v: | Computer graphics forum Ročník 20; číslo 3; s. 142 - 153 |
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| Hlavní autoři: | , , , |
| Médium: | Journal Article |
| Jazyk: | angličtina |
| Vydáno: |
Oxford, UK and Boston, USA
Blackwell Publishers Ltd
01.09.2001
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| Témata: | |
| ISSN: | 0167-7055, 1467-8659 |
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| 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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| AbstractList | 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. Abstract only |
| Author | Seidel, Hans-Peter Haber, Jörg Myszkowski, Karol Yamauchi, Hitoshi |
| Author_xml | – sequence: 1 givenname: Jörg surname: Haber fullname: Haber, Jörg organization: Max-Planck-Institut für Informatik, Saarbrücken, Germany – sequence: 2 givenname: Karol surname: Myszkowski fullname: Myszkowski, Karol organization: Max-Planck-Institut für Informatik, Saarbrücken, Germany – sequence: 3 givenname: Hitoshi surname: Yamauchi fullname: Yamauchi, Hitoshi organization: Max-Planck-Institut für Informatik, Saarbrücken, Germany – sequence: 4 givenname: Hans-Peter surname: Seidel fullname: Seidel, Hans-Peter organization: Max-Planck-Institut für Informatik, Saarbrücken, Germany |
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| Copyright | The Eurographics Association and Blackwell Publishers 2001 |
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| SubjectTerms | Image-based modeling/rendering panoramic image projective geometry vanishing line |
| Title | Perceptually Guided Corrective Splatting |
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