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    Prediction mode information upsampling for scalable video coding
    3.
    发明授权
    Prediction mode information upsampling for scalable video coding 有权

    公开(公告)号：US10721478B2

    公开(公告)日：2020-07-21

    申请号：US15585918

    申请日：2017-05-03

    申请人： QUALCOMM Incorporated

    发明人： Vadim Seregin ,  Jianle Chen ,  Xiang Li ,  Krishnakanth Rapaka ,  Marta Karczewicz ,  Ying Chen

    IPC分类号： H04N19/00 ,  H04N19/159 ,  H04N19/463 ,  H04N19/33 ,  H04N19/52 ,  H04N19/517 ,  H04N19/176

    摘要： In one embodiment, an apparatus configured to code video data includes a processor and a memory unit. The memory unit stores video data associated with a first layer having a first spatial resolution and a second layer having a second spatial resolution. The video data associated with the first layer includes at least a first layer block and first layer prediction mode information associated with the first layer block, and the first layer block includes a plurality of sub-blocks where each sub-block is associated with respective prediction mode data of the first layer prediction mode information. The processor derives the predication mode data associated with one of the plurality of sub-blocks based at least on a selection rule, upsamples the derived prediction mode data and the first layer block, and associates the upsampled prediction mode data with each upsampled sub-block of the upsampled first layer block.

    Reference picture list construction in intra block copy mode
    5.
    发明授权
    Reference picture list construction in intra block copy mode 有权

    公开(公告)号：US10178403B2

    公开(公告)日：2019-01-08

    申请号：US15187694

    申请日：2016-06-20

    申请人： QUALCOMM Incorporated

    发明人： Vadim Seregin ,  Krishnakanth Rapaka ,  Ye-Kui Wang ,  Marta Karczewicz

    IPC分类号： H04N11/02 ,  H04N19/503 ,  H04N19/70 ,  H04N19/593 ,  H04N19/573

    摘要： An apparatus configured to construct a reference picture list includes a memory and one or more processors in communication with the memory. The memory is configured to store one or more reference pictures. The one or more processors are configured to determine (i) a first number representative of a total number of reference pictures available for prediction in at least one of inter mode or intra block copy mode and (ii) a second number representative of a total number of reference pictures to be included in the reference picture list, and in response to a determination that the second number is greater than or equal to the first number, refrain from replacing a reference picture in the reference picture list with a current picture to be predicted. The one or more processors may encode or decode the current picture based on the reference picture list.

    QP derivation and offset for adaptive color transform in video coding
    6.
    发明授权
    QP derivation and offset for adaptive color transform in video coding 有权

    公开(公告)号：US10057578B2

    公开(公告)日：2018-08-21

    申请号：US14876594

    申请日：2015-10-06

    申请人： QUALCOMM Incorporated

    发明人： Krishnakanth Rapaka ,  Li Zhang ,  Rajan Laxman Joshi ,  Marta Karczewicz

    IPC分类号： H04N7/12 ,  H04N19/124 ,  H04N19/186 ,  H04N19/44 ,  H04N19/18 ,  H04N19/176 ,  H04N19/60 ,  H04N19/12

    摘要： A device for decoding video data is configured to determine, based on a chroma sampling format for the video data, that adaptive color transform is enabled for one or more blocks of the video data; determine a quantization parameter for the one or more blocks based on determining that the adaptive color transform is enabled; and dequantize transform coefficients based on the determined quantization parameter. A device for decoding video data is configured to determine for one or more blocks of the video data that adaptive color transform is enabled; receive in a picture parameter set, one or more offset values in response to adaptive color transform being enabled; determine a quantization parameter for a first color component of a first color space based on a first of the one or more offset values; and dequantize transform coefficients based on the quantization parameter.

    Intra block copy block vector signaling for video coding
    10.
    发明授权
    Intra block copy block vector signaling for video coding 有权

    公开(公告)号：US09948949B2

    公开(公告)日：2018-04-17

    申请号：US14743564

    申请日：2015-06-18

    申请人： QUALCOMM Incorporated

    发明人： Krishnakanth Rapaka ,  Joel Sole Rojals ,  Marta Karczewicz

    IPC分类号： H04N7/12 ,  H04N19/593 ,  H04N19/52

    CPC分类号： H04N19/593 ,  H04N19/52

    摘要： This disclosure describes techniques for coding video data according to an intra Block Copy (BC) coding mode. A block vector difference that identifies a prediction block may be represented by a plurality of syntax elements, which may be encoded and decoded. This disclosure proposes various techniques whereby a video encoder may conditionally signal syntax elements representing the absolute value and/or sign of the components of the block vector difference. Likewise, a video decoder may be configured to infer the values of the syntax elements representing the absolute value and/or sign of the components of the block vector difference when such syntax elements are not signaled.