公开(公告)号：US20200029091A1

公开(公告)日：2020-01-23

申请号：US16582939

申请日：2019-09-25

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/513 ,  H04N19/91 ,  H04N19/176 ,  H04N19/137

Abstract: Coding a motion vector difference (MVD) during an inter-prediction process. Example techniques may include determining a particular coding and/or signaling method for an MVD from among two or more MVD coding and/or signaling techniques. A video coder (e.g., a video encoder and/or a video decoder) may determine a particular MVD coding and/or signaling technique based on characteristics of video data or coding methods, including MV precision, Picture Order Count (POC) difference, or any other already coded/decoded information of a block of video data.

公开(公告)号：US10477240B2

公开(公告)日：2019-11-12

申请号：US15845484

申请日：2017-12-18

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/59 ,  H04N19/186 ,  H04N19/176 ,  H04N19/105 ,  H04N19/593 ,  H04N19/11 ,  H04N19/159

Abstract: Techniques are described of linear model (LM) prediction mode. In one or examples, a video encoder or video decoder may limit the number of neighboring luma samples that are fetched for downsampling thereby increasing the speed at which the video encoder or video decoder is able to complete the LM prediction encoding or decoding.

公开(公告)号：US10462462B2

公开(公告)日：2019-10-29

申请号：US15718725

申请日：2017-09-28

Applicant: QUALCOMM Incorporated

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

IPC: H04N7/12 ,  H04N19/13 ,  H04N19/137 ,  H04N19/513 ,  H04N19/70 ,  H04N19/52 ,  H04N19/91 ,  H04N19/523

Abstract: Coding a motion vector difference (MVD) during an inter-prediction process. Example techniques may include determining a particular coding and/or signaling method for an MVD from among two or more MVD coding and/or signaling techniques. A video coder (e.g., a video encoder and/or a video decoder) may determine a particular MVD coding and/or signaling technique based on characteristics of video data or coding methods, including MV precision, Picture Order Count (POC) difference, or any other already coded/decoded information of a block of video data.

公开(公告)号：US10448032B2

公开(公告)日：2019-10-15

申请号：US14017169

申请日：2013-09-03

Applicant: QUALCOMM Incorporated

Inventor： Jianle Chen ,  Liwei Guo ,  Xiang Li ,  Marta Karczewicz ,  Wei Pu

IPC: H04N19/30 ,  H04N19/117 ,  H04N19/187 ,  H04N19/33

Abstract: Methods and systems for video image coding are provided. Sets of filters may be selected and applied to video information at least partially based on phase displacement information between a first and second layer of video information. For example, the phase displacement information may correspond to a difference between a position of a pixel in the first layer and a corresponding position of the pixel in the second layer. The selected filter set can be an up-sampling filter or a down-sampling filter. The phase displacement information may be encoded as a syntax element embedded in the video bit stream.

公开(公告)号：US10448029B2

公开(公告)日：2019-10-15

申请号：US14688648

申请日：2015-04-16

Applicant: QUALCOMM Incorporated

Inventor： Xiang Li ,  Jianle Chen ,  Marta Karczewicz

IPC: H04N19/105 ,  H04N19/186 ,  H04N13/161 ,  H04N19/44 ,  H04N19/503 ,  H04N19/597 ,  H04N19/30 ,  H04N19/42 ,  H04N19/36

Abstract: Techniques are described for performing constrained three-dimensional (3D) color prediction for color gamut scalability in video coding. Color prediction techniques for color gamut scalability may be used by video coders to generate inter-layer reference pictures when a color gamut for a reference layer of video data is different than a color gamut for an enhancement layer of the video data, or when a bit depth of the reference layer is different than a bit depth of the enhancement layer. According to the techniques, a video coder may perform 3D color prediction with constrained bit depths of input and output color components of the 3D lookup table. According to further techniques, in the case of multiple layers, a video coder may perform 3D color prediction with constrained application to reference pictures in only one or more identified reference layers.

公开(公告)号：US10390015B2

公开(公告)日：2019-08-20

申请号：US15685738

申请日：2017-08-24

Applicant: QUALCOMM Incorporated

Inventor： Nan Hu ,  Jianle Chen ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/124 ,  H04N19/132 ,  H04N19/176 ,  H04N19/48 ,  H04N19/587 ,  H04N19/61 ,  H04N19/186 ,  H04N19/42 ,  H04N19/577

Abstract: A device for coding video data can be configured to perform a parameter derivation operation to determine one or more first parameters for a first block of video data; performing the parameter derivation operation to determine one or more second parameters for a second block of video data that is coded in a different coding mode than the first block of video data; code the first block of video data based on the one or more first parameters; and code the second block of video data based on the one or more second parameters.

公开(公告)号：US10368107B2

公开(公告)日：2019-07-30

申请号：US15676345

申请日：2017-08-14

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/186 ,  H04N19/159 ,  H04N19/176 ,  H04N19/11 ,  H04N19/593 ,  H04N19/103 ,  H04N19/96 ,  H04N19/70 ,  H04N19/463 ,  H04N19/46 ,  H04N19/124 ,  H04N19/91

Abstract: An example device includes a memory and processing circuitry in communication with the memory. The processing circuitry of a device is configured to form a most probable mode (MPM) candidate list for a chroma block of the video data stored to the memory, such that the MPM candidate list includes one or more derived modes (DMs) associated with a luma block of the video data associated with the chroma block, and a plurality of luma prediction modes that can be used for coding luminance components of the video data. The processing circuitry is further configured to select a mode from the MPM candidate list, and to code the chroma block according to the mode selected from the MPM candidate list.

公开(公告)号：US10368072B2

公开(公告)日：2019-07-30

申请号：US15166068

申请日：2016-05-26

Applicant: QUALCOMM Incorporated

Inventor： Li Zhang ,  Jianle Chen ,  Xin Zhao ,  Xiang Li ,  Hongbin Liu ,  Ying Chen ,  Marta Karczewicz

IPC: H04N19/13 ,  H04N19/174 ,  H04N19/159 ,  H04N19/42 ,  H04N19/70 ,  H04N19/126 ,  H04N19/139 ,  H03M7/40 ,  H04N19/46 ,  H04N19/91 ,  H04N19/146 ,  H04N19/184 ,  H03M7/30

Abstract: An example method of entropy coding video data includes obtaining 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 in a slice of the video data, wherein the pre-defined initialization value is stored with N-bit precision; determining, using a look-up table and based on the pre-defined initialization value, an initial probability state of the context for the slice of the video data, wherein a number of possible probability states for the context is greater than two raised to the power of N; and entropy coding, based on the initial probability state of the context, a bin of the value for the syntax element.

公开(公告)号：US10326986B2

公开(公告)日：2019-06-18

申请号：US15676314

申请日：2017-08-14

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/103 ,  H04N19/11 ,  H04N19/12 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/96 ,  H04N19/70 ,  H04N19/593 ,  H04N19/463

Abstract: Processing circuitry of a device is configured to determine that a plurality of derived modes (DMs) available for predicting a luma block of video data are also available for predicting a chroma block of the video data, the chroma block corresponding to the luma block, to form a candidate list of prediction modes with respect to the chroma block, the candidate list including one or more DMs of the multiple DMs, to determine to code the chroma block using any DM of the candidate list. The processing circuitry may, based on the determination to code the chroma block using any DM of the one or more DMs of the candidate list, code an indication identifying a selected DM of the candidate list to be used for coding the chroma block. The processing circuitry may code the chroma block according to the selected DM of the candidate list.

公开(公告)号：US10306229B2

公开(公告)日：2019-05-28

申请号：US15005736

申请日：2016-01-25

Applicant: QUALCOMM Incorporated

Inventor： Xin Zhao ,  Sungwon Lee ,  Jianle Chen ,  Li Zhang ,  Xiang Li ,  Ying Chen ,  Marta Karczewicz ,  Hongbin Liu

IPC: H04N19/12 ,  H04N19/60 ,  H04N19/70 ,  H04N19/103 ,  H04N19/109 ,  H04N19/112 ,  H04N19/122 ,  H04N19/129 ,  H04N19/136 ,  H04N19/157 ,  H04N19/159 ,  H04N19/167 ,  H04N19/176

Abstract: Example techniques are described to determine transforms to be used during video encoding and video decoding. A video encoder and a video decoder may select transform subsets that each identify one or more candidate transforms. The video encoder and the video decoder may determine transforms from the selected transform subsets.