公开(公告)号：US11025903B2

公开(公告)日：2021-06-01

申请号：US15868821

申请日：2018-01-11

Applicant: QUALCOMM Incorporated

Inventor： Li Zhang ,  Wei-Jung Chien ,  Xin Zhao ,  Marta Karczewicz

IPC: H04N19/103 ,  H04N19/593 ,  H04N19/136 ,  H04N19/186 ,  H04N19/157 ,  H04N19/11

Abstract: An example device for decoding video data includes a memory for storing video data, and one or more processors implemented in circuitry and configured to construct an intra-prediction candidate list for a current chroma block of the video data indicating candidate intra-prediction modes for the current chroma block, wherein the intra-prediction candidate list indicates a subset of allowed luminance (luma) candidate intra-prediction modes, determine cost (e.g., sum of absolute transform difference (SATD)) values for each of the candidate intra-prediction modes in the intra-prediction candidate list for the current chroma block, and generate a prediction block for the current chroma block using one of the candidate intra-prediction modes indicated by the intra-prediction candidate list according to the cost values (e.g., the candidate intra-prediction mode having the lowest cost value).

公开(公告)号：US11012715B2

公开(公告)日：2021-05-18

申请号：US16269349

申请日：2019-02-06

Applicant: QUALCOMM Incorporated

Inventor： Li Zhang ,  Kai Zhang ,  Wei-Jung Chien ,  Marta Karczewicz

IPC: H04N19/105 ,  H04N19/157 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/503 ,  H04N19/64 ,  H04N19/132 ,  H04N19/52 ,  H04N19/174 ,  H04N19/593

Abstract: This disclosure describes example techniques that a video coder (e.g., video encoder or video decoder) may utilize to determine a block vector for a chroma block where the partition trees for the chroma component and the luma component are different (e.g., decoupled partition trees).

公开(公告)号：US10856003B2

公开(公告)日：2020-12-01

申请号：US16148738

申请日：2018-10-01

Applicant: QUALCOMM Incorporated

Inventor： Kai Zhang ,  Jianle Chen ,  Xiang Li ,  Wei-Jung Chien ,  Yi-Wen Chen ,  Li Zhang ,  Marta Karczewicz

IPC: H04B1/66 ,  H04N7/12 ,  H04N11/02 ,  H04N11/04 ,  H04N19/52 ,  H04N19/176 ,  H04N19/54 ,  H04N19/137 ,  H04N19/105

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 motion vector difference (MVD) representing a difference between a first motion vector of a current block of video data predicted using affine prediction and a first motion vector predictor (MVP) for the first motion vector, predict a second MVD from the first MVD for a second motion vector of the current block, and code the current block using affine prediction according to the first motion vector and the second motion vector. Predicting the second MVD from the first MVD in this may reduce bitrate of a bitstream including coded video data, as well as improve processing efficiency.

公开(公告)号：US10812791B2

公开(公告)日：2020-10-20

申请号：US15701711

申请日：2017-09-12

Applicant: QUALCOMM Incorporated

Inventor： Wei-Jung Chien ,  Yi-Wen Chen ,  Li Zhang ,  Marta Karczewicz

IPC: H04N19/105 ,  H04N19/70 ,  H04N19/52 ,  H04N19/139 ,  H04N19/44 ,  H04N19/513

Abstract: In one example, a method includes receiving, in a coded video bitstream and for a current prediction unit (PU) of a current picture of video data, a representation of an offset vector that identifies a block of a reference picture, wherein the offset vector is within a set of values that are not uniformly distributed. The example method further includes determining, based on the block of the reference picture identified by the offset vector, motion information for the current PU. The example method further includes reconstructing the current PU based on the determined motion information.

公开(公告)号：US10757420B2

公开(公告)日：2020-08-25

申请号：US16015027

申请日：2018-06-21

Applicant: QUALCOMM Incorporated

Inventor： Kai Zhang ,  Jianle Chen ,  Li Zhang ,  Xiang Li ,  Marta Karczewicz

IPC: H04N19/159 ,  H04N19/513 ,  H04N19/182 ,  H04N19/107 ,  H04N19/463 ,  H04N19/503 ,  H04N19/11 ,  H04N19/124 ,  H04N19/139 ,  H04N19/176 ,  H04N19/44 ,  H04N19/593 ,  H04N19/186

Abstract: Techniques are described for using an inter-intra-prediction block. A video coder may generate a first prediction block according to an intra-prediction mode and generate a second prediction block according to an inter-prediction mode. The video coder may weighted combine, such as based on the intra-prediction mode, the two prediction blocks to generate an inter-intra-prediction block (e.g., final prediction block). In some examples, an inter-intra candidate is identified in a list of candidate motion vector predictors, and an inter-intra-prediction block is used based on identification of the inter-intra candidate in the list of candidate motion vector predictors.

公开(公告)号：US10728573B2

公开(公告)日：2020-07-28

申请号：US16123747

申请日：2018-09-06

Applicant: QUALCOMM Incorporated

Inventor： Yu-Chen Sun ,  Yi-Wen Chen ,  Wei-Jung Chien ,  Li Zhang ,  Xiang Li ,  Marta Karczewicz

IPC: H04N19/563 ,  H04N19/176 ,  H04N19/182 ,  H04N19/82 ,  H04N19/52

Abstract: A video coder, such as a video encoder or a video decoder, may use reference pixels in a first picture to pad pixels outside a picture boundary of a second picture. The second picture is a different picture from the first picture. The padded pixels are in a padding area surrounding the second picture. The video coder may encode or decode one or more blocks of the video data based on the padded pixels.

公开(公告)号：US10708591B2

公开(公告)日：2020-07-07

申请号：US15925310

申请日：2018-03-19

Applicant: QUALCOMM Incorporated

Inventor： Li Zhang ,  Yu-Chen Sun ,  Wei-Jung Chien ,  Jianle Chen ,  Kai Zhang ,  Yi-Wen Chen ,  Marta Karczewicz

IPC: H04N19/117 ,  H04N19/107 ,  H04N19/176 ,  H04N19/96 ,  H04N19/82 ,  H04N19/86 ,  H04N19/119 ,  H04N19/154

Abstract: A video encoder reconstructs pixels of a current block and applies a deblocking filter to the reconstructed pixels of the current block to derive deblocking-filtered reconstructed pixels of the current block. Furthermore, the video encoder calculates distortion values based on values of the deblocking-filtered reconstructed pixels of the current block and original pixels of the current block. The video encoder selects, based on the calculated distortion values, an encoding mode for the current block. The encoding mode for the current block is a partitioning mode for the current block or a coding unit mode for the current block.

公开(公告)号：US10574993B2

公开(公告)日：2020-02-25

申请号：US15166153

申请日：2016-05-26

Applicant: QUALCOMM Incorporated

Inventor： Li Zhang ,  Marta Karczewicz ,  Jianle Chen ,  Wei-Jung Chien

IPC: H04N19/13 ,  H04N19/174 ,  H04N19/124 ,  H04N19/136 ,  H04N19/122 ,  H04N19/176 ,  H04N19/625 ,  H04N19/126 ,  H04N19/159 ,  H04N19/577 ,  H04N19/91 ,  H04N19/17 ,  H04N19/436 ,  H04N19/172 ,  H04N19/157 ,  H04N19/184

Abstract: A video coding device includes processor(s) configured to determine, for each of a plurality of bins of a value for a syntax element of a current transform coefficient, contexts using respective corresponding bins of values for the syntax element of previously coded transform coefficients. The processor(s) are configured to determine a context for an ith bin of the value for the syntax element of the current transform coefficient using a corresponding ith bin of a value for the syntax element of a previously coded transform coefficient. To use the corresponding ith bin of the value for the syntax element of the previously coded transform coefficient, the processor(s) are configured to use only the ith bin, and no other bins, of the value for the syntax element of the previously coded transform coefficient. ‘i’ represents a non-negative integer.

公开(公告)号：US20200045310A1

公开(公告)日：2020-02-06

申请号：US16601486

申请日：2019-10-14

Applicant: QUALCOMM Incorporated

Inventor： Yi-Wen CHEN ,  Wei-Jung Chien ,  Li Zhang ,  Yu-Chen Sun ,  Jianle Chen ,  Marta Karczewicz

IPC: H04N19/105 ,  H04N19/537 ,  H04N19/52 ,  H04N19/139 ,  H04N19/176

Abstract: A video decoder selects a source affine block. The source affine block is an affine-coded block that spatially neighbors a current block. Additionally, the video decoder extrapolates motion vectors of control points of the source affine block to determine motion vector predictors for control points of the current block. The video decoder inserts, into an affine motion vector predictor (MVP) set candidate list, an affine MVP set that includes the motion vector predictors for the control points of the current block. The video decoder also determines, based on an index signaled in a bitstream, a selected affine MVP set in the affine MVP set candidate list. The video decoder obtains, from the bitstream, motion vector differences (MVDs) that indicate differences between motion vectors of the control points of the current block and motion vector predictors in the selected affine MVP set.

公开(公告)号：US10555006B2

公开(公告)日：2020-02-04

申请号：US15851219

申请日：2017-12-21

Applicant: QUALCOMM Incorporated

Inventor： Li Zhang ,  Wei-Jung Chien ,  Marta Karczewicz

IPC: H04N19/82 ,  H04N19/13 ,  H04N19/176

Abstract: A device for decoding video data determines mode information for a current block of a current picture of the video data; derives weights for use in a bilateral filter based on the mode information for the current block; applies the bilateral filter to a current sample of the current block by assign the weights to neighboring samples of the current sample of the current block and the current sample of the current block and modifying a sample value for the current sample based on sample values of the neighboring samples, the weights assigned to the neighboring samples, the sample value for the current sample, and the weight assigned to the current sample; and based on the modified sample value for the current sample, outputs a decoded version of the current picture.