公开(公告)号：US10523964B2

公开(公告)日：2019-12-31

申请号：US15919060

申请日：2018-03-12

Applicant: QUALCOMM Incorporated

Inventor： Hsiao-Chiang Chuang ,  Jianle Chen ,  Yi-Wen Chen ,  Xiang Li ,  Marta Karczewicz ,  Wei-Jung Chien

IPC: H04N19/543 ,  H04N19/517 ,  H04N19/61 ,  H04N19/107 ,  H04N19/20 ,  H04N19/30 ,  H04N19/577 ,  H04N19/70 ,  H04N5/14

Abstract: A video decoder can be configured to determine that a block of video data is encoded using a bi-directional inter prediction mode; determine that the block of video data is encoded using a bi-directional optical flow (BIO) process; inter predict the block of video data according to the bi-directional inter prediction mode; perform the BIO process for the block, wherein performing the BIO process for the block comprises determining a single motion vector refinement for a group of pixels in the block, wherein the group of pixels comprises at least two pixels; refine the group of pixels based on the single motion vector refinement; and output a BIO refined predictive block of video data comprising the refined group of pixels.

公开(公告)号：US10432943B2

公开(公告)日：2019-10-01

申请号：US15654580

申请日：2017-07-19

Applicant: QUALCOMM Incorporated

Inventor： Xiang Li ,  Jianle Chen ,  Marta Karczewicz

IPC: H04N19/136 ,  H04N19/124 ,  H04N19/30 ,  H04N19/186 ,  H04N19/42 ,  H04N19/105 ,  H04N19/70

Abstract: Techniques are described for signaling information used to generate three-dimensional (3D) color lookup tables for color gamut scalability in multi-layer video coding. A lower layer of video data may include color data in a first color gamut and a higher layer of the video data may include color data in a second color gamut. To generate inter-layer reference pictures, a video encoder and/or video decoder performs color prediction to convert the color data of a reference picture in the first color gamut to the second color gamut. The video coder may perform color prediction using a 3D lookup table. According to the techniques, a video encoder may encode partition information and/or color values of a 3D lookup table generated for color gamut scalability. A video decoder may decode the partition information and/or color values to generate the 3D lookup table in order to perform color gamut scalability.

公开(公告)号：US10327002B2

公开(公告)日：2019-06-18

申请号：US14743253

申请日：2015-06-18

Applicant: QUALCOMM Incorporated

Inventor： Chao Pang ,  Krishnakanth Rapaka ,  Xiang Li ,  Joel Sole Rojals ,  Cheng-Teh Hsieh ,  Marta Karczewicz

IPC: H04N19/513 ,  H04N19/52 ,  H04N19/176 ,  H04N19/184 ,  H04N19/174 ,  H04N19/503 ,  H04N19/172 ,  H04N19/105 ,  H04N19/159 ,  H04N19/593 ,  H04N19/109

Abstract: Techniques and systems are provided for encoding and decoding video data. For example, a method of encoding video data including a plurality of pictures is described. The method includes performing intra-picture prediction on a block of one of the pictures to generate a prediction unit. Performing the intra-picture prediction includes selecting a reference block for intra-block copy prediction of a coding tree unit (CTU). The reference block is selected from a plurality of encoded blocks, and blocks within the CTU encoded with bi-prediction are excluded from selection as the reference block. Performing the intra-picture prediction further includes performing intra-block copy prediction with the selected reference block to generate the prediction unit. The method also includes generating syntax elements encoding the prediction unit based on the performed intra-picture prediction.

公开(公告)号：US10327001B2

公开(公告)日：2019-06-18

申请号：US14743176

申请日：2015-06-18

Applicant: QUALCOMM Incorporated

Inventor： Chao Pang ,  Krishnakanth Rapaka ,  Xiang Li ,  Joel Sole Rojals ,  Cheng-Teh Hsieh ,  Marta Karczewicz

IPC: H04N19/513 ,  H04N19/184 ,  H04N19/172 ,  H04N19/503 ,  H04N19/52 ,  H04N19/176 ,  H04N19/174 ,  H04N19/105 ,  H04N19/159 ,  H04N19/593 ,  H04N19/109

Abstract: Techniques and systems are provided for encoding and decoding video data. For example, a method of encoding video data includes obtaining video data at an encoder, and determining to perform intra-picture prediction on the video data, using intra-block copy prediction, to generate the plurality of encoded video pictures. The method also includes performing the intra-picture prediction on the video data using the intra-block copy prediction, and, in response to determining to perform the intra-picture prediction on the video data using the intra-block copy prediction, disabling at least one of inter-picture bi-prediction or inter-picture uni-prediction for the plurality of encoded video pictures. The method also includes generating the plurality of encoded video pictures based on the received video data according to the performed intra-block copy prediction.

公开(公告)号：US10284842B2

公开(公告)日：2019-05-07

申请号：US14194159

申请日：2014-02-28

Applicant: QUALCOMM Incorporated

Inventor： Adarsh Krishnan Ramasubramonian ,  Ying Chen ,  Xiang Li ,  Ye-Kui Wang

IPC: H04N19/105 ,  H04N19/597 ,  H04N19/30 ,  H04N19/513 ,  H04N19/187 ,  H04N19/39 ,  H04N19/167 ,  H04N19/577

Abstract: A method of coding video data includes upsampling at least a portion of a reference layer picture to an upsampled picture having an upsampled picture size. The upsampled picture size has a horizontal upsampled picture size and a vertical upsampled picture size. At least one of the horizontal or vertical upsampled picture sizes may be different than a horizontal picture size or vertical picture size, respectively, of an enhancement layer picture. In addition, position information associated with the upsampled picture may be signaled. An inter-layer reference picture may be generated based on the upsampled picture and the position information.

公开(公告)号：US20180376166A1

公开(公告)日：2018-12-27

申请号：US16015046

申请日：2018-06-21

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/577 ,  H04N19/82 ,  H04N19/159 ,  H04N19/105 ,  H04N19/573 ,  H04N19/583 ,  H04N19/61

Abstract: A device for decoding video data is configured to perform interpolation filtering using an N-tap filter to generate an interpolated search space for a first block of video data; obtain a first predictive block in the interpolated search space; determine that a second block of video data is encoded using a bi-directional inter prediction mode and a bi-directional optical flow (BIO) process; perform an inter prediction process for the second block of video data using the bi-directional inter prediction mode to determine a second predictive block; perform the BIO process on the second predictive block to determine a BIO-refined version of the second predictive block, wherein a number of reference samples used for calculating intermediate values for BIO offsets is limited to a region of (W+N−1)×(H+N−1) integer samples, wherein W and H correspond to a width and height of the second block in integer samples.

公开(公告)号：US20180376149A1

公开(公告)日：2018-12-27

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

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：US20180278949A1

公开(公告)日：2018-09-27

申请号：US15927854

申请日：2018-03-21

Applicant: QUALCOMM Incorporated

Inventor： Marta Karczewicz ,  Yi-Wen Chen ,  Wei-Jung Chien ,  Hsiao-Chiang Chuang ,  Xiang Li ,  Jianle Chen

IPC: H04N19/513 ,  H04N19/44

Abstract: Techniques related to decoder-side motion vector derivation (DMVD) are described. For example, this disclosure describes techniques related to applying one or more constraints to motion information, such as a motion vector (MV) derived by DMVD, and/or a MV difference between an initial MV and an MV derived by DMVD. When the constraint is applied to the DMVD, in certain examples, only the derived motion information which meets the constraint is regarded as valid motion information. Conditions may be placed on the constraints.

公开(公告)号：US10057574B2

公开(公告)日：2018-08-21

申请号：US15040913

申请日：2016-02-10

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/117 ,  H04N19/70 ,  H04N19/61 ,  H04N19/593 ,  H04N19/176 ,  H04N19/50 ,  H04N19/503 ,  H04N19/82 ,  H04N19/86

CPC classification number: H04N19/117 ,  H04N19/176 ,  H04N19/50 ,  H04N19/503 ,  H04N19/593 ,  H04N19/61 ,  H04N19/70 ,  H04N19/82 ,  H04N19/86

Abstract: Examples include a device for coding video data, the device including a memory configured to store video data, and one or more processors configured to obtain adaptive loop filtering (ALF) information for a current coding tree unit (CTU) from one or more of: (i) one or more spatial neighbor CTUs of the current CTU or (ii) one or more temporal neighbor CTUs of the current CTU, to form a candidate list based at least partially on the obtained ALF information for the current CTU, and to perform a filtering operation on the current CTU using ALF information associated with a candidate from the candidate list. Coding video data includes encoding video data, decoding video data, or both encoding and decoding video data.

公开(公告)号：US20180199072A1

公开(公告)日：2018-07-12

申请号：US15862203

申请日：2018-01-04

Applicant: QUALCOMM Incorporated

Inventor： Xiang Li ,  Xin Zhao ,  Li Zhang ,  Jianle Chen ,  Hsiao-Chiang Chuang ,  Marta Karczewicz

IPC: H04N19/96 ,  H04N19/176 ,  H04N19/61 ,  H04N19/18 ,  H04N19/124 ,  H04N19/105 ,  H04N19/13 ,  H04N19/159

Abstract: A method of decoding video comprising: receiving an encoded block of video data, determining a transform for the encoded block of video data, wherein the transform has a size S that is not a power of two, rounding S to a power of two creating a transform with a modified size S′, applying an inverse transform with the modified size S′ to the encoded block of video data to create residual video data, and decoding the residual video data to create decoded block of video data.