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Specular Lobe-Aware Filtering and Upsampling for Interactive Indirect Illumination.

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Title: Specular Lobe-Aware Filtering and Upsampling for Interactive Indirect Illumination.
Authors: Tokuyoshi, Y.1 tokuyosh@square-enix.com
Source: Computer Graphics Forum. Sep2015, Vol. 34 Issue 6, p135-147. 13p. 15 Color Photographs, 1 Diagram, 1 Chart, 4 Graphs.
Subjects: Interactive computer graphics, Real-time rendering (Computer graphics), Image processing, Reflectance, Euclidean distance, Gaussian processes
Abstract: Although geometry-aware filtering and upsampling have often been used for interactive or real-time rendering, they are unsuitable for glossy surfaces because shading results strongly depend on the bidirectional reflectance distribution functions. This paper proposes a novel weighting function of cross bilateral filtering and upsampling to measure the similarity of specular lobes. The difficulty is that a specular lobe is represented with a distribution function in directional space, whereas conventional cross bilateral filtering evaluates similarities using the distance between two points in a Euclidean space. Therefore, this paper first generalizes cross bilateral filtering for the similarity of distribution functions in a non-Euclidean space. Then, the weighting function is specialized for specular lobes. Our key insight is that the weighting function of bilateral filtering can be represented with the product integral of two distribution functions corresponding to two pixels. In addition, we propose spherical Gaussianbased approximations to calculate this weighting function analytically. Our weighting function detects the edges of glossiness, and adapts to all-frequency materials using only a camera position and G-buffer. These features are not only suitable for path tracing, but also deferred shading and non-ray tracing-based methods such as voxel cone tracing. [ABSTRACT FROM AUTHOR]
Copyright of Computer Graphics Forum is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: <searchLink fieldCode="JN" term="%22Computer+Graphics+Forum%22">Computer Graphics Forum</searchLink>. Sep2015, Vol. 34 Issue 6, p135-147. 13p. 15 Color Photographs, 1 Diagram, 1 Chart, 4 Graphs.
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  Data: <searchLink fieldCode="DE" term="%22Interactive+computer+graphics%22">Interactive computer graphics</searchLink><br /><searchLink fieldCode="DE" term="%22Real-time+rendering+%28Computer+graphics%29%22">Real-time rendering (Computer graphics)</searchLink><br /><searchLink fieldCode="DE" term="%22Image+processing%22">Image processing</searchLink><br /><searchLink fieldCode="DE" term="%22Reflectance%22">Reflectance</searchLink><br /><searchLink fieldCode="DE" term="%22Euclidean+distance%22">Euclidean distance</searchLink><br /><searchLink fieldCode="DE" term="%22Gaussian+processes%22">Gaussian processes</searchLink>
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  Data: Although geometry-aware filtering and upsampling have often been used for interactive or real-time rendering, they are unsuitable for glossy surfaces because shading results strongly depend on the bidirectional reflectance distribution functions. This paper proposes a novel weighting function of cross bilateral filtering and upsampling to measure the similarity of specular lobes. The difficulty is that a specular lobe is represented with a distribution function in directional space, whereas conventional cross bilateral filtering evaluates similarities using the distance between two points in a Euclidean space. Therefore, this paper first generalizes cross bilateral filtering for the similarity of distribution functions in a non-Euclidean space. Then, the weighting function is specialized for specular lobes. Our key insight is that the weighting function of bilateral filtering can be represented with the product integral of two distribution functions corresponding to two pixels. In addition, we propose spherical Gaussianbased approximations to calculate this weighting function analytically. Our weighting function detects the edges of glossiness, and adapts to all-frequency materials using only a camera position and G-buffer. These features are not only suitable for path tracing, but also deferred shading and non-ray tracing-based methods such as voxel cone tracing. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Computer Graphics Forum is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1111/cgf.12525
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        Text: English
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        PageCount: 13
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      – SubjectFull: Interactive computer graphics
        Type: general
      – SubjectFull: Real-time rendering (Computer graphics)
        Type: general
      – SubjectFull: Image processing
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      – SubjectFull: Reflectance
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      – SubjectFull: Euclidean distance
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      – SubjectFull: Gaussian processes
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      – TitleFull: Specular Lobe-Aware Filtering and Upsampling for Interactive Indirect Illumination.
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              Text: Sep2015
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