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    Method and Apparatus for Reduction of Artifacts at Discontinuous Boundaries in Coded Virtual-Reality Images
    4.
    发明申请
    Method and Apparatus for Reduction of Artifacts at Discontinuous Boundaries in Coded Virtual-Reality Images 审中-公开

    公开(公告)号：US20190026934A1

    公开(公告)日：2019-01-24

    申请号：US16034601

    申请日：2018-07-13

    Applicant: MEDIATEK INC.

    Inventor： Cheng-Hsuan SHIH ,  Chia-Ying LI ,  Ya-Hsuan LEE ,  Hung-Chih LIN ,  Jian-Liang LIN ,  Shen-Kai CHANG

    IPC: G06T15/00

    Abstract: Methods and apparatus of processing 360-degree virtual reality images are disclosed. According to one method, a 2D (two-dimensional) frame is divided into multiple blocks. The multiple blocks are encoded or decoded using quantization parameters by restricting a delta quantization parameter to be within a threshold for any two blocks corresponding to two neighboring blocks on a 3D sphere. According to another embodiment, one or more guard bands are added to one or more edges that are discontinuous in the 2D frame but continuous in the 3D sphere. Fade-out process is applied to said one or more guard bands to generate one or more faded guard bands. At the decoder side, the reconstructed 2D frame is generated from the decoded extended 2D frame by cropping said one or more decoded faded guard bands or by blending said one or more decoded faded guard bands and reconstructed duplicated areas.

    Method and Apparatus of Face Independent Coding Structure for VR Video
    5.
    发明申请
    Method and Apparatus of Face Independent Coding Structure for VR Video 审中-公开

    公开(公告)号：US20170374364A1

    公开(公告)日：2017-12-28

    申请号：US15628826

    申请日：2017-06-21

    Applicant: MEDIATEK INC.

    Inventor： Jian-Liang LIN ,  Chao-Chih HUANG ,  Hung-Chih LIN ,  Chia-Ying LI ,  Shen-Kai CHANG

    IPC: H04N19/119 ,  H04N19/51 ,  H04N19/61 ,  H04N19/85

    CPC classification number: H04N19/119 ,  H04N19/103 ,  H04N19/114 ,  H04N19/51 ,  H04N19/597 ,  H04N19/61 ,  H04N19/85

    Abstract: A method and apparatus of video encoding or decoding for a video encoding or decoding system applied to multi-face sequences corresponding to a 360-degree virtual reality sequence are disclosed. According to embodiments of the present invention, at least one face sequence of the multi-face sequences is encoded or decoded using face-independent coding, where the face-independent coding encodes or decodes a target face sequence using prediction reference data derived from previous coded data of the target face sequence only. Furthermore, one or more syntax elements can be signaled in a video bitstream at an encoder side or parsed from the video bitstream at a decoder side, where the syntax elements indicate first information associated with a total number of faces in the multi-face sequences, second information associated with a face index for each face-independent coded face sequence, or both the first information and the second information.

    Method and Apparatus of Inter Coding for VR Video Using Virtual Reference Frames
    7.
    发明申请
    Method and Apparatus of Inter Coding for VR Video Using Virtual Reference Frames 审中-公开

    公开(公告)号：US20170374385A1

    公开(公告)日：2017-12-28

    申请号：US15629855

    申请日：2017-06-22

    Applicant: MEDIATEK INC.

    Inventor： Chao-Chih HUANG ,  Hung-Chih LIN ,  Jian-Liang LIN ,  Chia-Ying LI ,  Shen-Kai CHANG

    IPC: H04N19/597 ,  H04N19/176 ,  H04N19/105

    CPC classification number: H04N19/597 ,  H04N19/105 ,  H04N19/167 ,  H04N19/176

    Abstract: A method and apparatus of video encoding or decoding for a video encoding or decoding system applied to multi-face sequences corresponding to a 360-degree virtual reality sequence are disclosed. According the present invention, one or more multi-face sequences representing the 360-degree virtual reality sequence are derived. If Inter prediction is selected for a current block in a current face, one virtual reference frame is derived for each face of said one or more multi-face sequences by assigning one target reference face to a center of said one virtual reference frame and connecting neighboring faces of said one target reference face to said one target reference face at boundaries of said one target reference face. Then, the current block in the current face is encoded or decoded using a current virtual reference frame derived for the current face to derive an Inter predictor for the current block.

    Method and Apparatus for Mapping Omnidirectional Image to a Layout Output Format
    8.
    发明申请
    Method and Apparatus for Mapping Omnidirectional Image to a Layout Output Format 审中-公开

    公开(公告)号：US20170323423A1

    公开(公告)日：2017-11-09

    申请号：US15585224

    申请日：2017-05-03

    Applicant: MEDIATEK INC.

    Inventor： Jian-Liang LIN ,  Hung-Chih LIN ,  Chia-Ying LI ,  Shen-Kai CHANG

    IPC: G06T3/00 ,  H04N19/70 ,  H04N13/00

    CPC classification number: G06T3/0062 ,  G06T3/0087 ,  H04N13/139 ,  H04N19/597 ,  H04N19/70 ,  H04N19/88

    Abstract: Methods and apparatus of processing omnidirectional images are disclosed. According to one method, a current set of omnidirectional images converted from each spherical image in a 360-degree panoramic video sequence using a selected projection format is received, where the selected projection format belongs to a projection format group comprising a cubicface format, and the current set of omnidirectional images with the cubicface format consists of six cubic faces. If the selected projection format corresponds to the cubicface format, one or more mapping syntax elements to map the current set of omnidirectional images into a current cubemap image are signaled. The coded data are then provided in a bitstream including said one or more mapping syntax elements for the current set of omnidirectional images.

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