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    USING PREVIOUSLY RENDERED SCENE FRAMES TO REDUCE PIXEL NOISE
    13.
    发明申请
    USING PREVIOUSLY RENDERED SCENE FRAMES TO REDUCE PIXEL NOISE 审中-公开

    公开(公告)号：US20200058103A1

    公开(公告)日：2020-02-20

    申请号：US16530854

    申请日：2019-08-02

    Applicant: Nvidia Corporation

    Inventor： Shiqiu Liu ,  Jacopo Pantaleoni

    IPC: G06T5/00 ,  G06T5/20 ,  G06T15/06 ,  G06T15/50 ,  G06T1/20 ,  G06T5/40

    Abstract: This disclosure presents a method to denoise a ray traced scene where the ray tracing uses a minimal number of rays. The method can use temporal reprojections to compute a weighted average to the scene data. A spatial filter can be run on the scene data, using the temporal reprojection count to reduce the size of the utilized spatial filter radius. In some aspects, additional temporal filters can be applied to the scene data. In some aspects, global illumination temporal reprojection history counts can be used to modify the spatial filter radius. In some aspects, caustic photon tracing can be conducted to compute a logarithmic cost, which can then be utilized to reduce the denoising radius used by the spatial filter. The modified and adjusted scene data can be sent to a rendering process to complete the rendering to generate a final scene.

    REFLECTION DENOISING IN RAY-TRACING APPLICATIONS
    14.
    发明申请
    REFLECTION DENOISING IN RAY-TRACING APPLICATIONS 审中-公开

    公开(公告)号：US20190287294A1

    公开(公告)日：2019-09-19

    申请号：US16355214

    申请日：2019-03-15

    Applicant: NVIDIA Corporation

    Inventor： Shiqiu Liu ,  Christopher Ryan Wyman ,  Jon Hasselgren ,  Jacob Munkberg ,  Ignacio Llamas

    IPC: G06T15/50 ,  G06T15/06 ,  G06T5/00 ,  G06T5/20

    Abstract: Disclosed approaches may leverage the actual spatial and reflective properties of a virtual environment—such as the size, shape, and orientation of a bidirectional reflectance distribution function (BRDF) lobe of a light path and its position relative to a reflection surface, a virtual screen, and a virtual camera—to produce, for a pixel, an anisotropic kernel filter having dimensions and weights that accurately reflect the spatial characteristics of the virtual environment as well as the reflective properties of the surface. In order to accomplish this, geometry may be computed that corresponds to a projection of a reflection of the BRDF lobe below the surface along a view vector to the pixel. Using this approach, the dimensions of the anisotropic filter kernel may correspond to the BRDF lobe to accurately reflect the spatial characteristics of the virtual environment as well as the reflective properties of the surface.

    Filtering render data using multiple iterations for a filter direction
    15.
    发明授权
    Filtering render data using multiple iterations for a filter direction 有权

    公开(公告)号：US11688042B2

    公开(公告)日：2023-06-27

    申请号：US17376939

    申请日：2021-07-15

    Applicant: NVIDIA CORPORATION

    Inventor： Shiqiu Liu ,  Jacopo Pantaleoni

    IPC: G06T5/00 ,  G06T5/20 ,  G06T1/20 ,  G06T5/40 ,  G06T15/06 ,  G06T15/50

    CPC classification number: G06T5/002 ,  G06T1/20 ,  G06T5/20 ,  G06T5/40 ,  G06T15/06 ,  G06T15/50 ,  G06T2207/20182

    Abstract: Various approaches are disclosed to temporally and spatially filter noisy image data—generated using one or more ray-tracing effects—in a graphically rendered image. Rather than fully sampling data values using spatial filters, the data values may be sparsely sampled using filter taps within the spatial filters. To account for the sparse sampling, locations of filter taps may be jittered spatially and/or temporally. For filtering efficiency, a size of a spatial filter may be reduced when historical data values are used to temporally filter pixels. Further, data values filtered using a temporal filter may be clamped to avoid ghosting. For further filtering efficiency, a spatial filter may be applied as a separable filter in which the filtering for a filter direction may be performed over multiple iterations using reducing filter widths, decreasing the chance of visual artifacts when the spatial filter does not follow a true Gaussian distribution.

    REFLECTION DENOISING IN RAY-TRACING APPLICATIONS
    16.
    发明申请
    REFLECTION DENOISING IN RAY-TRACING APPLICATIONS 有权

    公开(公告)号：US20220327765A1

    公开(公告)日：2022-10-13

    申请号：US17852132

    申请日：2022-06-28

    Applicant: NVIDIA Corporation

    Inventor： Shiqiu Liu ,  Christopher Ryan Wyman ,  Jon Hasselgren ,  Jacob Munkberg ,  Ignacio Llamas

    IPC: G06T15/06 ,  G06T15/60 ,  G06T5/00 ,  G06T5/20 ,  G06T15/50

    Abstract: Disclosed approaches may leverage the actual spatial and reflective properties of a virtual environment—such as the size, shape, and orientation of a bidirectional reflectance distribution function (BRDF) lobe of a light path and its position relative to a reflection surface, a virtual screen, and a virtual camera—to produce, for a pixel, an anisotropic kernel filter having dimensions and weights that accurately reflect the spatial characteristics of the virtual environment as well as the reflective properties of the surface. In order to accomplish this, geometry may be computed that corresponds to a projection of a reflection of the BRDF lobe below the surface along a view vector to the pixel. Using this approach, the dimensions of the anisotropic filter kernel may correspond to the BRDF lobe to accurately reflect the spatial characteristics of the virtual environment as well as the reflective properties of the surface.

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