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    Dynamic video configurations
    1.
    发明授权
    Dynamic video configurations 有权

    公开(公告)号：US11025933B2

    公开(公告)日：2021-06-01

    申请号：US15585581

    申请日：2017-05-03

    Applicant: Apple Inc.

    Inventor： Dazhong Zhang ,  Hang Yuan ,  Peikang Song ,  Jae Hoon Kim ,  Xing Wen ,  Sudeng Hu ,  Xiaosong Zhou ,  Chris Y. Chung ,  Hsi-Jung Wu

    IPC: H04N19/423 ,  H04N19/463 ,  H04N21/44 ,  H04N21/6379 ,  H04N21/6373

    Abstract: Techniques are disclosed for managing memory allocations when coding video data according to multiple codec configurations. According to these techniques, devices may negotiate parameters of a coding session that include parameters of a plurality of different codec configurations that may be used during the coding session. A device may estimate sizes of decoded picture buffers for each of the negotiated codec configurations and allocate in its memory a portion of memory sized according to a largest size of the estimated decoded picture buffers. Thereafter, the devices may exchange coded video data. The exchange may involve decoding coded data of reference pictures and storing the decoded reference pictures in the allocated memory. During the coding session, the devices may toggle among the different negotiated codec configurations. As they do, reallocations of memory may be avoided.

    Video coding techniques for multi-view video
    2.
    发明授权
    Video coding techniques for multi-view video 有权

    公开(公告)号：US10924747B2

    公开(公告)日：2021-02-16

    申请号：US15443342

    申请日：2017-02-27

    Applicant: Apple Inc.

    Inventor： Jae Hoon Kim ,  Chris Y. Chung ,  Dazhong Zhang ,  Hang Yuan ,  Hsi-Jung Wu ,  Jiefu Zhai ,  Xiaosong Zhou

    IPC: H04B1/66 ,  H04N19/176 ,  H04N19/105 ,  H04N19/112 ,  H04N19/174 ,  H04N19/593 ,  H04N19/597

    Abstract: Techniques are disclosed for coding and decoding video captured as cube map images. According to these techniques, padded reference images are generated for use during predicting input data. A reference image is stored in a cube map format. A padded reference image is generated from the reference image in which image data of a first view contained in reference image is replicated and placed adjacent to a second view contained in the cube map image. When coding a pixel block of an input image, a prediction search may be performed between the input pixel block and content of the padded reference image. When the prediction search identifies a match, the pixel block may be coded with respect to matching data from the padded reference image. Presence of replicated data in the padded reference image is expected to increase the likelihood that adequate prediction matches will be identified for input pixel block data, which will increase overall efficiency of the video coding.

    Efficient still image coding with video compression techniques
    3.
    发明授权
    Efficient still image coding with video compression techniques 有权

    公开(公告)号：US10812832B2

    公开(公告)日：2020-10-20

    申请号：US14732393

    申请日：2015-06-05

    Applicant: Apple Inc.

    Inventor： Hang Yuan ,  Chris Y. Chung ,  Jae Hoon Kim ,  Yeping Su ,  Jiefu Zhai ,  Xiaosong Zhou ,  Hsi-Jung Wu

    IPC: H04N19/85 ,  H04N19/33 ,  H04N19/88 ,  H04N19/503

    Abstract: Coding techniques for image data may cause a still image to be converted to a “phantom” video sequence, which is coded by motion compensated prediction techniques. Thus, coded video data obtained from the coding operation may include temporal prediction references between frames of the video sequence. Metadata may be generated that identifies allocations of content from the still image to the frames of the video sequence. The coded data and the metadata may be transmitted to another device, whereupon it may be decoded by motion compensated prediction techniques and converted back to a still image data. Other techniques may involve coding an image in both a base layer representation and at least one coded enhancement layer representation. The enhancement layer representation may be coded predictively with reference to the base layer representation. The coded base layer representation may be partitioned into a plurality of individually-transmittable segments and stored. Prediction references of elements of the enhancement layer representation may be confined to segments of the base layer representation that correspond to a location of those elements. Meaning, when a pixel block of an enhancement layer maps to a given segment of the base layer representation, prediction references are confined to that segment and do not reference portions of the base layer representation that may be found in other segment(s).

    Video Coding Techniques for Multi-View Video
    7.
    发明申请
    Video Coding Techniques for Multi-View Video 审中-公开

    公开(公告)号：US20180249164A1

    公开(公告)日：2018-08-30

    申请号：US15443342

    申请日：2017-02-27

    Applicant: Apple Inc.

    Inventor： Jae Hoon Kim ,  Chris Y. Chung ,  Dazhong Zhang ,  Hang Yuan ,  Hsi-Jung Wu ,  Jiefu Zhai ,  Xiaosong Zhou

    IPC: H04N19/176 ,  H04N19/105 ,  H04N19/112 ,  H04N19/174 ,  H04N19/593

    CPC classification number: H04N19/176 ,  H04N19/105 ,  H04N19/112 ,  H04N19/174 ,  H04N19/593 ,  H04N19/597

    Abstract: Techniques are disclosed for coding and decoding video captured as cube map images. According to these techniques, padded reference images are generated for use during predicting input data. A reference image is stored in a cube map format. A padded reference image is generated from the reference image in which image data of a first view contained in reference image is replicated and placed adjacent to a second view contained in the cube map image. When coding a pixel block of an input image, a prediction search may be performed between the input pixel block and content of the padded reference image. When the prediction search identifies a match, the pixel block may be coded with respect to matching data from the padded reference image. Presence of replicated data in the padded reference image is expected to increase the likelihood that adequate prediction matches will be identified for input pixel block data, which will increase overall efficiency of the video coding.

    SPHERE PROJECTED MOTION ESTIMATION/COMPENSATION AND MODE DECISION
    9.
    发明申请
    SPHERE PROJECTED MOTION ESTIMATION/COMPENSATION AND MODE DECISION 有权

    公开(公告)号：US20210321133A1

    公开(公告)日：2021-10-14

    申请号：US17207267

    申请日：2021-03-19

    Applicant: Apple Inc.

    Inventor： Jae Hoon Kim ,  Xiaosong Zhou ,  Dazhong Zhang ,  Hang Yuan ,  Jiefu Zhai ,  Chris Y. Chung ,  Hsi-Jung Wu

    IPC: H04N19/597 ,  H04N19/176 ,  H04N19/105 ,  H04N19/547

    Abstract: Techniques are disclosed for coding video data predictively based on predictions made from spherical-domain projections of input pictures to be coded and reference pictures that are prediction candidates. Spherical projection of an input picture and the candidate reference pictures may be generated. Thereafter, a search may be conducted for a match between the spherical-domain representation of a pixel block to be coded and a spherical-domain representation of the reference picture. On a match, an offset may be determined between the spherical-domain representation of the pixel block to a matching portion of the of the reference picture in the spherical-domain representation. The spherical-domain offset may be transformed to a motion vector in a source-domain representation of the input picture, and the pixel block may be coded predictively with reference to a source-domain representation of the matching portion of the reference picture.

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