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    • 40-Issue 7
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    Real-time Denoising Using BRDF Pre-integration Factorization

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    Date
    2021
    Author
    Zhuang, Tao ORCID
    Shen, Pengfei ORCID
    Wang, Beibei ORCID
    Liu, Ligang ORCID
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    Abstract
    Path tracing has been used for real-time renderings, thanks to the powerful GPU device. Unfortunately, path tracing produces noisy rendered results, thus, filtering or denoising is often applied as a post-process to remove the noise. Previous works produce high-quality denoised results, by accumulating the temporal samples. However, they cannot handle the details from bidirectional reflectance distribution function (BRDF) maps (e.g. roughness map). In this paper, we introduce the BRDF preintegration factorization for denoising to better preserve the details from BRDF maps. More specifically, we reformulate the rendering equation into two components: the BRDF pre-integration component and the weighted-lighting component. The BRDF pre-integration component is noise-free, since it does not depend on the lighting. Another key observation is that the weighted-lighting component tends to be smooth and low-frequency, which indicates that it is more suitable for denoising than the final rendered image. Hence, the weighted-lighting component is denoised individually. Our BRDF pre-integration demodulation approach is flexible for many real-time filtering methods. We have implemented it in spatio-temporal varianceguided filtering (SVGF), ReLAX and ReBLUR. Compared to the original methods, our method manages to better preserve the details from BRDF maps, while both the memory and time cost are negligible.
    BibTeX
    @article {10.1111:cgf.14411,
    journal = {Computer Graphics Forum},
    title = {{Real-time Denoising Using BRDF Pre-integration Factorization}},
    author = {Zhuang, Tao and Shen, Pengfei and Wang, Beibei and Liu, Ligang},
    year = {2021},
    publisher = {The Eurographics Association and John Wiley & Sons Ltd.},
    ISSN = {1467-8659},
    DOI = {10.1111/cgf.14411}
    }
    URI
    https://doi.org/10.1111/cgf.14411
    https://diglib.eg.org:443/handle/10.1111/cgf14411
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    Eurographics Association copyright © 2013 - 2023 
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    Theme by @mire NV
    System hosted at  Graz University of Technology.
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