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    Quantization parameter control for video coding with joined pixel/transform based quantization
    263.
    发明授权
    Quantization parameter control for video coding with joined pixel/transform based quantization 有权

    公开(公告)号：US10681358B2

    公开(公告)日：2020-06-09

    申请号：US16224320

    申请日：2018-12-18

    Applicant: QUALCOMM Incorporated

    Inventor： Dmytro Rusanovskyy ,  Adarsh Krishnan Ramasubramonian ,  Marta Karczewicz

    IPC: H04N19/186 ,  H04N19/18 ,  H04N19/124 ,  H04N19/176 ,  G06T5/00 ,  H04N19/85

    Abstract: A device for processing high dynamic range and/or wide color gamut (HDR/WCG) video data can be configured to determine a quantization parameter for quantized transform coefficients of a block of the HDR/WCG video data; inverse quantize the quantized transform coefficients based on the determined quantization parameter to determine dequantized transform coefficients; based on the dequantized transform coefficients, determine a block of residual values for the block of the HDR/WCG video data; based on the block of residual values, determine a reconstructed block for the block of the HDR/WCG video data; determine one or more dynamic range adjustment (DRA) parameters for the block of the HDR/WCG video data; adjust the one or more DRA parameters based on the determined quantization parameter to determine one or more adjusted DRA parameters; and perform DRA on the reconstructed block of the HDR/WCG video data using the one or more adjusted DRA parameters.

    POSITION-DEPENDENT INTRA-INTER PREDICTION COMBINATION IN VIDEO CODING
    265.
    发明申请
    POSITION-DEPENDENT INTRA-INTER PREDICTION COMBINATION IN VIDEO CODING 审中-公开

    公开(公告)号：US20200162737A1

    公开(公告)日：2020-05-21

    申请号：US16684379

    申请日：2019-11-14

    Applicant: QUALCOMM Incorporated

    Inventor： Geert Van der Auwera ,  Adarsh Krishnan Ramasubramonian ,  Marta Karczewicz ,  Luong Pham Van

    IPC: H04N19/126 ,  H04N19/503 ,  H04N19/593 ,  H04N19/176

    Abstract: A device for coding video data includes a processor configured to generate an inter-prediction block and an intra-prediction block for a current block of video data; for each sample of a prediction block to be generated: determine a first weight for the sample according to a position of the sample in the prediction block; determine a second weight for the sample according to the position of the sample in the prediction block; apply the first weight to a sample at the position in the inter-prediction block to generate a weighted inter-prediction sample; apply the second weight to a sample at the position in the intra-prediction block to generate a weighted intra-prediction sample; and calculate a value for the sample at the position in the prediction block using the weighted inter-prediction sample and the weighted intra-prediction sample; and code the current block using the prediction block.

    Color remapping for non-4:4:4 format video content
    267.
    发明授权
    Color remapping for non-4:4:4 format video content 有权

    公开(公告)号：US10574959B2

    公开(公告)日：2020-02-25

    申请号：US16027185

    申请日：2018-07-03

    Applicant: QUALCOMM Incorporated

    Inventor： Adarsh Krishnan Ramasubramonian ,  Joel Sole Rojals ,  Dmytro Rusanovskyy

    IPC: H04N9/67 ,  H04N9/77 ,  H04N19/132 ,  H04N19/122 ,  H04N19/186 ,  H04N19/182 ,  H04N19/70

    Abstract: A video decoder is configured to reconstruct a first version of a current picture; determine a transformed sample of the first component, a transformed sample of the second component, and a transformed sample of the third component by applying a first matrix to a triplet comprising the samples of the first, second, and third components; include the transformed samples of the first, second, and third components in a second version of the current picture; determine, based on the transformed samples of the first, second, and third components and a first row of a second matrix, a set of transformed samples for the third component, the set of transformed samples for the third component including samples of the third component that are immediately neighboring the transformed sample of the third component; and include the set of transformed samples for the third component in the second version of the current picture.

    Methods and systems for generating color remapping information supplemental enhancement information messages for video
    269.
    发明授权
    Methods and systems for generating color remapping information supplemental enhancement information messages for video 有权

    公开(公告)号：US10397443B2

    公开(公告)日：2019-08-27

    申请号：US15436313

    申请日：2017-02-17

    Applicant: QUALCOMM Incorporated

    Inventor： Adarsh Krishnan Ramasubramonian ,  Joel Sole Rojals ,  Dmytro Rusanovskyy ,  Done Bugdayci Sansli ,  Marta Karczewicz

    IPC: H04N1/60 ,  G06T7/90 ,  H04N19/70 ,  H04N19/186

    Abstract: Systems, methods, and computer readable media are described for providing improved color remapping. In some examples, a video bitstream is obtained that includes a plurality of pictures having a first color characteristic. A color remapping information (CRI) supplemental enhancement information (SEI) message is identified from the video bitstream. A restriction is placed on the CRI SEI message such that a value of a syntax element of the CRI SEI message is restricted based on a condition. One or more samples of the plurality of pictures is remapped from the first color characteristic to a second color characteristic using a color remapping model of the CRI SEI message according to the restriction. In some cases, the condition is a chroma format of the plurality of pictures, in which case the value of the syntax element of the CRI SEI message is restricted based on the chroma format. In some cases, the condition is a color remap value identifying a purpose of the color remapping model of the CRI SEI message, in which case the value of the syntax element of the CRI SEI message is restricted based on the color remap value.

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