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    IMPLICIT TRANSFORM SELECTION IN VIDEO CODING
    42.
    发明申请
    IMPLICIT TRANSFORM SELECTION IN VIDEO CODING 审中-公开

    公开(公告)号：US20200296370A1

    公开(公告)日：2020-09-17

    申请号：US16815920

    申请日：2020-03-11

    Applicant: QUALCOMM Incorporated

    Inventor： Hilmi Enes Egilmez ,  Amir Said ,  Vadim Seregin ,  Marta Karczewicz

    IPC: H04N19/122 ,  H04N19/61 ,  H04N19/176 ,  H04N19/593

    Abstract: An example method includes inferring, for a current transform block of a current video block, a transform type from a plurality of transform types that includes one or more discrete cosine transforms (DCTs) and one or more discrete sine transforms (DSTs), wherein inferring the transform type comprises: determining a size of the current transform block; determining whether the current video block is partitioned using intra-subblock partitioning (ISP); and responsive to determining that the size of the current transform block is less than a threshold and that the current video block is partitioned using ISP, selecting a particular DST of the one or more DSTs as the selected transform type; transforming, using the selected transform type, the current transform block to obtain a block of reconstructed residual data for the video block; and reconstructing, based on the reconstructed residual data for the video block, the video block.

    Extended multiple transform selection for video coding
    46.
    发明授权
    Extended multiple transform selection for video coding 有权

    公开(公告)号：US11683527B2

    公开(公告)日：2023-06-20

    申请号：US17450509

    申请日：2021-10-11

    Applicant: QUALCOMM Incorporated

    Inventor： Hilmi Enes Egilmez ,  Vadim Seregin ,  Amir Said ,  Marta Karczewicz

    IPC: H04N19/625 ,  H04N19/61 ,  H04N19/176

    CPC classification number: H04N19/625 ,  H04N19/176 ,  H04N19/61

    Abstract: An example device for coding video data includes a memory configured to store video data; and one or more processors implemented in circuitry and configured to: code a first codeword representing a selected transform scheme of a set of transform candidates of a multiple transform selection (MTS) scheme for a current block of video data, the selected transform scheme being a secondary transform of a set of available secondary transforms to be applied in addition to a primary transform; code a second codeword representing the secondary transform from the set of available secondary transforms; and apply the primary transform and the secondary transform during coding of residual data for the current block. The second codeword may be a value for a low-frequency non-separable transform (LFNST) syntax element.

    Multi-scale optical flow for learned video compression
    47.
    发明授权
    Multi-scale optical flow for learned video compression 有权

    公开(公告)号：US11638025B2

    公开(公告)日：2023-04-25

    申请号：US17207244

    申请日：2021-03-19

    Applicant: QUALCOMM Incorporated

    Inventor： Reza Pourreza ,  Amir Said ,  Yang Yang ,  Yinhao Zhu ,  Taco Sebastiaan Cohen

    IPC: H04N19/51 ,  H04N19/172 ,  H04N19/137 ,  H04N19/107 ,  H04N19/593 ,  G06N3/08

    Abstract: Systems and techniques are described for encoding and/or decoding data based on motion estimation that applies variable-scale warping. An encoding device can receive an input frame and a reference frame that depict a scene at different times. The encoding device can generate an optical flow identifying movements in the scene between the two frames. The encoding device can generate a weight map identifying how finely or coarsely the reference frame can be warped for input frame prediction. The encoding device can generate encoded video data based on the optical flow and the weight map. A decoding device can generate a reconstructed optical flow and a reconstructed weight map from the encoded data. A decoding device can generate a prediction frame by warping the reference frame based on the reconstructed optical flow and the reconstructed weight map. The decoding device can generate a reconstructed input frame based on the prediction frame.

    VIDEO INTRA PREDICTION USING HYBRID RECURSIVE FILTERS
    48.
    发明申请
    VIDEO INTRA PREDICTION USING HYBRID RECURSIVE FILTERS 有权

    公开(公告)号：US20230016033A1

    公开(公告)日：2023-01-19

    申请号：US17934934

    申请日：2022-09-23

    Applicant: QUALCOMM Incorporated

    Inventor： Amir Said ,  Xin Zhao ,  Wei-Jung Chien ,  Jianle Chen ,  Marta Karczewicz

    IPC: H04N19/61 ,  H04N19/117 ,  H04N19/82 ,  H04N19/593 ,  H04N19/10 ,  H04N19/192 ,  H04N19/436 ,  H04N19/615 ,  H04N19/70 ,  H04N19/80 ,  H04N19/91

    Abstract: An example method of decoding video data includes obtaining, from a coded video bitstream and for a current block of the video data, an indication of an intra-prediction mode that identifies an initial predictive block; filtering, in parallel, samples in a current line of a plurality of lines of the initial predictive block based on filtered values of samples in a preceding line of the plurality of lines and unfiltered values of samples in the current line to generate filtered values for samples for the current line; and reconstructing, using intra prediction, values of samples of the current block based on the filtered values of the samples of the current initial predictive block and residual data for the current block that represents a difference between the filtered values of the samples of the current initial predictive block and the values of samples of the current block.

    Adaptive multiple transform coding
    49.
    发明授权
    Adaptive multiple transform coding 有权

    公开(公告)号：US11218694B2

    公开(公告)日：2022-01-04

    申请号：US16576677

    申请日：2019-09-19

    Applicant: QUALCOMM Incorporated

    Inventor： Vadim Seregin ,  Akshay Gadde ,  Hilmi Enes Egilmez ,  Marta Karczewicz ,  Amir Said

    IPC: H04N19/61 ,  H04N19/176 ,  H04N19/103 ,  H04N19/115 ,  H04N19/156

    Abstract: Techniques are described for improving transform coding. For example, an encoded block of video data can be obtained, and a width and/or a height of the block can be determined. The width can be compared to a first threshold and/or the height can be compared to a second threshold. A horizontal transform and a vertical transform can be determined for the block based on comparing the width of the block to the first threshold and/or the height of the block to the second threshold. The horizontal transform and the vertical transform are determined without decoding a syntax element that indicates the horizontal transform and the vertical transform (e.g., the syntax element is not in an encoded video bitstream processed by a decoding device). In some cases, residual data is determined using the horizontal and vertical transforms, and a video block is determined using the residual data and a predictive block.

    Probability initialization for video coding
    50.
    发明授权
    Probability initialization for video coding 有权

    公开(公告)号：US11178399B2

    公开(公告)日：2021-11-16

    申请号：US16816016

    申请日：2020-03-11

    Applicant: QUALCOMM Incorporated

    Inventor： Jie Dong ,  Amir Said ,  Vadim Seregin ,  Marta Karczewicz

    IPC: H04N19/13 ,  H04N19/44 ,  H04N19/124 ,  H04N19/91

    Abstract: An example method for entropy decoding of video data includes retrieving a pre-defined initialization value for a context of a plurality of contexts used in a context-adaptive entropy coding process to entropy code a value for a syntax element for an independently codable unit of video data; determining, based on the pre-defined initialization value and in a linear domain, an initial probability state of the context; and entropy decoding, from a bitstream and based on the initial probability state of the context, a bin of the value for the syntax element.

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