公开(公告)号：US10986340B2

公开(公告)日：2021-04-20

申请号：US16426749

申请日：2019-05-30

Applicant: QUALCOMM Incorporated

Inventor： Hilmi Enes Egilmez ,  Yung-Hsuan Chao ,  Amir Said ,  Vadim Seregin ,  Marta Karczewicz ,  Wei-Jung Chien

IPC: H04N19/12 ,  H04N19/46 ,  H04N19/186 ,  H04N19/176 ,  H04N19/169

Abstract: An example device for decoding video data includes a memory configured to store video data; and a processor implemented in circuitry and configured to decode a truncated unary codeword representing a multiple transform (MT) scheme for a current block of the video data to determine the MT scheme; apply the MT scheme to transform coefficients of the current block to produce residual data for the current block of video data; and decode the current block using the residual data. The MT scheme may include a plurality of transforms, such as a horizontal transform and a vertical transform, a primary transform and a second transform, or any combination of separable and/or non-separable transforms. Thus, a single truncated unary codeword may represent the entire MT scheme, that is, each of a plurality of transforms of the MT scheme.

公开(公告)号：US10958928B2

公开(公告)日：2021-03-23

申请号：US16379560

申请日：2019-04-09

Applicant: QUALCOMM Incorporated

Inventor： Yung-Hsuan Chao ,  Yu-Chen Sun ,  Wei-Jung Chien ,  Yi-Wen Chen ,  Marta Karczewicz

IPC: H04N19/513 ,  H04N19/70 ,  H04N19/176 ,  H04N19/44

Abstract: A method of decoding video data comprising performing a prediction process for one or more neighboring blocks of video data that are neighboring a current block of video data to obtain prediction pixel values for neighboring pixels of the current block of video data, deriving a template for the current block of video data using the prediction pixel values, performing a decoder-side motion vector derivation technique using the derived template to derive a motion vector for the current block of video data, and decoding the current block of video data using the derived motion vector.

公开(公告)号：US20200382813A1

公开(公告)日：2020-12-03

申请号：US16886381

申请日：2020-05-28

Applicant: QUALCOMM Incorporated

Inventor： Marta Karczewicz ,  Hongtao Wang ,  Muhammed Zeyd Coban ,  Yung-Hsuan Chao

IPC: H04N19/88

Abstract: Techniques for coding coefficients in a residual block are described. A video coder (e.g., video encoder or video decoder) may code (e.g., encode or decode), in an interleaving manner, coefficient information on a coefficient-by-coefficient basis for coefficients in a residual block of a current block of the video data in a first pass, wherein the coefficient information for a coefficient includes one or more of a significance flag indicating whether a value of the coefficient is not zero, a parity flag indicating whether the value of the coefficient is odd or even, a sign flag indicating whether the value of the coefficient is positive or negative, and one or more greater than flags indicating whether an absolute value of the coefficient is greater than respective threshold values, and after the first pass, code remainder information for coefficients in the residual block of the current block in a second pass.

公开(公告)号：US20200186794A1

公开(公告)日：2020-06-11

申请号：US16705174

申请日：2019-12-05

Applicant: QUALCOMM Incorporated

Inventor： Yung-Hsuan Chao ,  Dmytro Rusanovskyy ,  Yu Han ,  Wei-Jung Chien ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/105 ,  H04N19/137 ,  H04N19/159 ,  H04N19/176

Abstract: Embodiments include systems and methods of generating merge candidates for an inter-prediction mode of a video block. In particular, embodiments include methods of generating spatial-temporal motion vector predictor candidates. Embodiments may include video encoders and video decoders.

公开(公告)号：US20190230356A1

公开(公告)日：2019-07-25

申请号：US16250845

申请日：2019-01-17

Applicant: QUALCOMM Incorporated

Inventor： Yung-Hsuan Chao ,  Yi-Wen Chen ,  Wei-Jung Chien ,  Marta Karczewicz

IPC: H04N19/124 ,  H04N19/119 ,  H04N19/176 ,  H04N19/174 ,  H04N19/96

Abstract: A method of coding video data comprising determining a quantization group (QG) based on one or more of a size of a CU splitting node and a value of a region-based parameter, determining a single quantization parameter for all blocks of video data within the determined quantization group, and performing a quantization process on transform coefficients of all blocks of video data within the determined quantization group using the determined single quantization parameter.

公开(公告)号：US11496745B2

公开(公告)日：2022-11-08

申请号：US16909892

申请日：2020-06-23

Applicant: QUALCOMM Incorporated

Inventor： Marta Karczewicz ,  Yung-Hsuan Chao ,  Muhammed Zeyd Coban ,  Hongtao Wang

IPC: H04N19/14 ,  H04N19/70 ,  H04N19/176 ,  H04N19/46 ,  H04L65/70 ,  H04L65/75

Abstract: A video decoder can be configured to determine that a block of video data is encoded without transforming residual data for the block; determine a quantization parameter for the block of video data; based on the determined quantization parameter, determine a range for levels of quantized residual values of the block; divide the range into k intervals, wherein k is an integer value; determine a level for a quantized residual value of the block based on the k intervals by receiving information indicating the level for the quantized residual value is within a particular interval of the k intervals, receiving information indicating a difference value that represents a difference between a reference level value for the particular interval and the level for the quantized residual value of the block, and based on the reference level value and the difference value, determining the level for the quantized residual value.

公开(公告)号：US11418787B2

公开(公告)日：2022-08-16

申请号：US16912232

申请日：2020-06-25

Applicant: QUALCOMM Incorporated

Inventor： Yu Han ,  Geert Van der Auwera ,  Muhammed Zeyd Coban ,  Wei-Jung Chien ,  Yung-Hsuan Chao ,  Alican Nalci ,  Marta Karczewicz

IPC: H04N19/186 ,  H04N19/124 ,  H04N19/176 ,  H04N19/169 ,  H04N19/70

Abstract: A video decoder can be configured to determine a predicted luma quantization parameter (QP) for a luma component of a coding unit; receive, in the bitstream of encoded video data, first syntax indicating a luma delta QP value for the luma component; determine a QP value for the luma component based on the predicted luma QP and the luma delta QP value; determine a predicted chroma QP for a chroma component of the coding unit; receive, in the bitstream of encoded video data, second syntax indicating a chroma delta QP value for the chroma component of the coding unit; and determine a QP value for the chroma component of the coding unit based on the predicted chroma QP and the chroma delta QP value.

公开(公告)号：US11381819B2

公开(公告)日：2022-07-05

申请号：US16918741

申请日：2020-07-01

Applicant: QUALCOMM Incorporated

Inventor： Yu Han ,  Geert Van der Auwera ,  Muhammed Zeyd Coban ,  Wei-Jung Chien ,  Yung-Hsuan Chao ,  Alican Nalci ,  Marta Karczewicz

IPC: H04N19/124 ,  H04N19/176 ,  H04N19/96 ,  H04N19/463 ,  H04N19/186

Abstract: Examples of block-level signaling of quantization parameter offsets is described. Such block-level signaling of quantization parameter offsets provides block level flexibility to determine a more precise chroma quantization parameter (QP) for a chroma block. With the block-level quantization parameter offset signaling described in this disclosure, there is more flexibility in defining the chroma QP, resulting in more accurate determination of chroma QP on a chroma block-by-chroma block basis.

公开(公告)号：US11228768B2

公开(公告)日：2022-01-18

申请号：US16991305

申请日：2020-08-12

Applicant: QUALCOMM Incorporated

Inventor： Marta Karczewicz ,  Yung-Hsuan Chao ,  Muhammed Zeyd Coban ,  Hongtao Wang

IPC: H04N19/157 ,  H04N19/176 ,  H04N19/132 ,  H04N19/124 ,  H04N19/463 ,  H04N19/122

Abstract: A method of decoding video data includes receiving a value indicating that a lossless mode is enabled for a block of the video data and, in response to determining that the value indicates that the lossless mode is enabled for the block of the video data, determining a maximum size for a lossless-coded transform block of the block of the video data is set to a maximum scanning size of the non-lossless coding block. The method further includes inverse scanning residual values for the block of the video data based on the maximum size for the lossless-coded transform block to generate a residual block for the block of the video data and reconstructing the block of the video data based on the residual block.

公开(公告)号：US20210092393A1

公开(公告)日：2021-03-25

申请号：US17029767

申请日：2020-09-23

Applicant: QUALCOMM Incorporated

Inventor： Yung-Hsuan Chao ,  Cheng-Teh Hsieh ,  Marta Karczewicz

IPC: H04N19/132 ,  H04N19/146 ,  H04N19/186 ,  H04N19/176

Abstract: An example device includes a memory configured to store at least a portion of an encoded video bitstream; and one or more processors that are implemented in circuitry and configured to: determine, based on a parameter of a first block of video data, a maximum number of entries to be used for palette-mode coding of the current block; generate, based on the determined maximum number of entries and based on a palette predictor, a palette for the first block of video data, the palette including one or more entries each including a palette index that is associated with a color value; decode, from the encoded video bitstream and for the first block of video data, index values for samples of the first block that identify entries in the palette; and reconstruct, based on the index values, the samples of the first block.