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    Method and apparatus to encode and decode images of points of a sphere
    11.
    发明授权
    Method and apparatus to encode and decode images of points of a sphere 有权

    公开(公告)号：US12283021B2

    公开(公告)日：2025-04-22

    申请号：US17415931

    申请日：2019-12-18

    Applicant: InterDigital VC Holdings, Inc.

    Inventor： Julien Fleureau ,  Bertrand Chupeau ,  Renaud Dore

    IPC: G06T3/073 ,  G06T3/40 ,  G06T9/00

    Abstract: Methods and devices are provided to encode points of a sphere onto an image by projecting them as a function of an isotropic region guided mapping operator and/or to decode pixels of an image onto a sphere by de-projected them according to the same parametrized mapping operator. A region of interest is determined on the sphere and the angular resolution of pixels of the image is modulated as a function of their distance to the reference pixel corresponding to the center of the region of interest. Chosen angular resolutions and size of the region of interest are associated with the image and encoded in a stream.

    Method and apparatus for decoding three-dimensional scenes
    14.
    发明授权
    Method and apparatus for decoding three-dimensional scenes 有权

    公开(公告)号：US11721044B2

    公开(公告)日：2023-08-08

    申请号：US17612808

    申请日：2020-05-26

    Applicant: InterDigital VC Holdings, Inc.

    Inventor： Julien Fleureau ,  Gerard Briand ,  Renaud Dore

    IPC: G06T9/00 ,  G06T15/20 ,  G06T15/50

    CPC classification number: G06T9/00 ,  G06T15/20 ,  G06T15/503

    Abstract: Generating an image from a source image can involve encoding a projection of a part of a three-dimensional scene. Pixels of a source image comprise a depth and a color attribute. Pixels of a source image are de-projected as colored point cloud. A de-projected point in a 3D space has the color attribute of the pixel that it has been de-projected from. Also, a score is attributed to the generated point according to a local depth gradient and/or a local color gradient of the pixel it comes from, the lower the gradient, the higher the score. The generated point cloud is captured by a virtual camera for rendering on a display device. The point cloud is projected onto the viewport image by blending color of points projected on a same pixel, the blending being weighted by the scores of these points.

    Methods and apparatus for depth encoding and decoding
    15.
    发明授权
    Methods and apparatus for depth encoding and decoding 有权

    公开(公告)号：US11671596B2

    公开(公告)日：2023-06-06

    申请号：US17047251

    申请日：2019-04-09

    Applicant: InterDigital VC Holdings, Inc.

    Inventor： Julien Fleureau ,  Renaud Dore ,  Franck Thudor ,  Thierry Tapie

    IPC: H04N19/124 ,  H04N19/176 ,  H04N19/179 ,  H04N19/597

    CPC classification number: H04N19/124 ,  H04N19/176 ,  H04N19/179 ,  H04N19/597

    Abstract: Methods and device for encoding/decoding data representative of depth of a 3D scene. The depth data are quantized in a range of quantized depth values larger than a range of encoding values allowed by a determined encoding bit depth. For blocks of pixels comprising the depth data, a first set of candidate quantization parameters is determined. A second set of quantization parameters is determined as a subset of the union of the first sets. The second set comprising candidate quantization parameters common to a plurality of blocks. One or more quantization parameters of the second set being associated with each block of pixels of the picture. The second set of quantization parameters is encoded, and the quantized depth values are encoded according to the quantization parameters.

    Method, apparatus and stream for encoding/decoding volumetric video
    17.
    发明授权
    Method, apparatus and stream for encoding/decoding volumetric video 有权

    公开(公告)号：US11367247B2

    公开(公告)日：2022-06-21

    申请号：US16766355

    申请日：2018-11-06

    Applicant: InterDigital VC Holdings, Inc.

    Inventor： Franck Thudor ,  Bertrand Chupeau ,  Renaud Dore ,  Thierry Tapie ,  Julien Fleureau

    IPC: G06T15/08 ,  G06T7/73 ,  G06T17/10 ,  G06T15/04 ,  H04N19/597

    Abstract: Encoding/decoding data representative of a 3D representation of a scene according to a range of points of view can involve generating a depth map associated with a part of the 3D representation according to a parameter representative of a two-dimensional parameterization associated with the part and data associated with a point included in the part, wherein the two-dimensional parameterization can be responsive to geometric information associated with the point and to pose information associated with the range of points of view. A texture map associated with the part can be generated according to the parameter and data associated with the point. First information representative of point density of points in a part of the part can be obtained. The depth map, texture map, parameter, and first information can be included in respective syntax elements of a bitstream.

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