公开(公告)号：US20210160481A1

公开(公告)日：2021-05-27

申请号：US17103415

申请日：2020-11-24

Applicant: QUALCOMM Incorporated

Inventor： Han Huang ,  Chun-Chi Chen ,  Adarsh Krishnan Ramasubramonian ,  Vadim Seregin ,  Wei-Jung Chien ,  Geert Van der Auwera ,  Marta Karczewicz

IPC: H04N19/105 ,  H04N19/61 ,  H04N19/186 ,  H04N19/176

Abstract: A video decoder can be configured to determine that a block of the video data is encoded using an adaptive color transform (ACT); determine that the block is encoded in a joint chroma mode, wherein for the joint chroma mode a single chroma residual block is encoded for a first chroma component of the block and a second chroma component of the block; determine a quantization parameter (QP) for the block; determine an ACT quantization parameter (QP) offset for the block based on the block being encoded using the ACT and encoded in the joint chroma mode; and determine an ACT QP for the block based on the QP and the ACT QP offset.

公开(公告)号：US11019360B2

公开(公告)日：2021-05-25

申请号：US16824431

申请日：2020-03-19

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/593 ,  H04N19/176 ,  H04N19/70 ,  H04N19/105

Abstract: In some examples, a device includes a memory configured to store a current block of the video data and one or more processors coupled to the memory. The one or more processors may be configured to derive a reference sample position (RSP) for a current sample of a current block according to one or more RSP derivation models. The one or more RSP derivation models may include a circular model, an elliptical model, a piece-wise linear model, a table-based model, or a parametric model. The one or more processors may be further configured to determine a reference sample value for a reference sample at the RSP, determine a predicted value for the current sample using the reference sample value, and code the current sample using the predicted value.

公开(公告)号：US20210092405A1

公开(公告)日：2021-03-25

申请号：US17024522

申请日：2020-09-17

Applicant: QUALCOMM Incorporated

Inventor： Thibaud Laurent Biatek ,  Adarsh Krishnan Ramasubramonian ,  Geert Van der Auwera ,  Marta Karczewicz

IPC: H04N19/159 ,  H04N19/46 ,  H04N19/176 ,  H04N19/70 ,  H04N19/59

Abstract: A video decoder obtains a transpose flag from the bitstream. The video decoder determines an input vector based on neighboring samples for a current block of the video data. The transpose flag indicates whether the input vector is transposed. Additionally, the video decoder determines a prediction signal. Determining the prediction signal includes multiplying a MIP matrix by the input vector. The prediction signal includes values corresponding to a first set of locations in a prediction block for the current block and the MIP matrix corresponds to the MIP mode index. The video decoder applies an interpolation process to the prediction signal to determine values corresponding to a second set of locations in the prediction block for the current block.

公开(公告)号：US20210084343A1

公开(公告)日：2021-03-18

申请号：US17024422

申请日：2020-09-17

Applicant: QUALCOMM Incorporated

Inventor： Adarsh Krishnan Ramasubramonian ,  Geert Van der Auwera ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/96 ,  H04N19/186

Abstract: An example device includes a memory and one or more processors. The one or more processors are configured to determine whether a first coding tree unit (CTU) is coded using single tree and based on the first CTU being coded using single tree, determine a first transform unit (TU) based on a first transform block (TB) of luma samples and a first two corresponding TBs of chroma samples. The one or more processors are also configured to determine whether a second CTU is coded using dual tree and based on the second CTU being coded using dual tree, determine a second TU based on either (i) a second TB of luma samples or (ii) a second two TBs of chroma samples. The first TU includes syntax structures used to transform first TB samples and the second TU includes syntax structures used to transform second TB samples.

公开(公告)号：US20210084324A1

公开(公告)日：2021-03-18

申请号：US17022700

申请日：2020-09-16

Applicant: QUALCOMM Incorporated

Inventor： Bappaditya Ray ,  Han Huang ,  Geert Van der Auwera ,  Marta Karczewicz

IPC: H04N19/51 ,  H04N19/176 ,  H04N19/117

Abstract: An example device for decoding video data includes memory configured to store the video data and one or more processors implemented in circuitry and communicatively coupled to the memory. The one or more processors are configured to determine whether a coding mode for a current block of the video data is an affine mode. The one or more processors are also configured to determine whether pattern refined optical flow (PROF) is enabled in the sequence parameter set (SPS) for the current block. Based at least in part on the coding mode for the current block being the affine mode and PROF being enabled in the SPS for the current block, the one or more processors are configured to disable a deblocking filter for subblock boundaries of the current block and decode the current block with the deblocking filter disabled for the subblock boundaries of the current block.

公开(公告)号：US20210058620A1

公开(公告)日：2021-02-25

申请号：US16997321

申请日：2020-08-19

Applicant: QUALCOMM Incorporated

Inventor： Adarsh Krishnan Ramasubramonian ,  Geert Van der Auwera ,  Wei-Jung Chien ,  Han Huang ,  Yu Han ,  Bappaditya Ray ,  Marta Karczewicz

IPC: H04N19/124 ,  H04N19/44 ,  H04N19/186 ,  H04N19/176

Abstract: Techniques are described for decoding video data. A video decoder may determine chroma blocks in a chroma quantization group (QG) of the video data, determine a quantization parameter predictor that is the same for each of the chroma blocks of the chroma QG, determine an offset value that is the same for two or more of the chroma blocks of the chroma QG, determine a quantization parameter value for each of the two or more of the chroma blocks in the chroma QG based on the quantization parameter predictor and the offset value inverse quantize coefficients of one or more residual blocks for the chroma blocks based on the determined quantization parameter value, generate the one or more residual blocks based on the inverse quantized coefficients, and reconstruct the chroma blocks based on the one or more residual blocks.

公开(公告)号：US20200304832A1

公开(公告)日：2020-09-24

申请号：US16824431

申请日：2020-03-19

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/593 ,  H04N19/105 ,  H04N19/70 ,  H04N19/176

Abstract: In some examples, a device includes a memory configured to store a current block of the video data and one or more processors coupled to the memory. The one or more processors may be configured to derive a reference sample position (RSP) for a current sample of a current block according to one or more RSP derivation models. The one or more RSP derivation models may include a circular model, an elliptical model, a piece-wise linear model, a table-based model, or a parametric model. The one or more processors may be further configured to determine a reference sample value for a reference sample at the RSP, determine a predicted value for the current sample using the reference sample value, and code the current sample using the predicted value.

公开(公告)号：US20200280742A1

公开(公告)日：2020-09-03

申请号：US16800467

申请日：2020-02-25

Applicant: QUALCOMM Incorporated

Inventor： Adarsh Krishnan Ramasubramonian ,  Geert Van der Auwera ,  Cheng-Teh Hsieh ,  Vadim Seregin ,  Luong Pham Van ,  Marta Karczewicz

IPC: H04N19/645 ,  H04N19/159 ,  H04N19/176 ,  H04N19/174

Abstract: A video coder may be configured to code video data by performing splitting of a coding unit (CU) of video data using intra sub-partition (ISP) to form a set of prediction blocks. The video coder may group a plurality of the prediction blocks from the set of prediction blocks into a first prediction block group (PBG). The video coder may reconstruct samples of prediction blocks included in the first PBG independently of samples of other prediction blocks included in the first PBG.

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.

公开(公告)号：US20200007895A1

公开(公告)日：2020-01-02

申请号：US16459024

申请日：2019-07-01

Applicant: QUALCOMM Incorporated

Inventor： Geert Van der Auwera ,  Adarsh Krishnan Ramasubramonian ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/82 ,  H04N19/176 ,  H04N19/105

Abstract: A video coder is configured to determine whether a condition is true for a block of a current picture of the video data. Based on the condition being true for the block, the video coder may apply a non-smoothing interpolation filter to unfiltered reference samples of the first block to generate predictive samples of the block. Based on the condition being false for the block, the video coder may apply a smoothing interpolation filter to unfiltered reference samples of the second block to generate predictive samples of the second block.