公开(公告)号：US11115658B2

公开(公告)日：2021-09-07

申请号：US16893974

申请日：2020-06-05

Applicant: QUALCOMM Incorporated

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

IPC: H04N7/18 ,  H04N19/11 ,  H04N19/59 ,  H04N19/176 ,  H04N19/70 ,  H04N19/159 ,  H04N19/105 ,  H04N19/132 ,  H04N19/186 ,  H04N19/91 ,  H04N19/167 ,  H04N19/61 ,  H04N19/23 ,  H04N19/136 ,  G06T3/40 ,  G06T7/50

Abstract: A method of decoding video data includes predicting luma samples for a block of the video data using matrix intra prediction (MIP), where using MIP comprises down-sampling a set of luma neighboring samples to generate down-sampled luma neighboring samples. The method further includes predicting chroma samples for the block using cross-component linear model (CCLM) prediction, where using CCLM prediction comprises predicting the chroma samples for the block based on the down-sampled luma neighboring samples generated from the MIP. The method further includes determining a prediction block for the block based on the luma samples and the chroma samples, decoding a residual block for the block, and combining the prediction block and the residual block to decode the block.

公开(公告)号：US11057622B2

公开(公告)日：2021-07-06

申请号：US16714432

申请日：2019-12-13

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/11 ,  H04N19/176

Abstract: A video decoder configured to determine a block of video data is intra predicted using an angular intra prediction mode, wherein the angular intra prediction mode is one of a bottom-left intra prediction mode or a top-right intra prediction mode; determine an aspect ratio of the block; locate one or more reference samples corresponding to the angular intra prediction mode; apply position dependent intra prediction combination to the reference samples to determine modified reference samples based on the aspect ratio of the block; and generate a predictive block for the block based on the modified reference samples.

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：US10979729B2

公开(公告)日：2021-04-13

申请号：US15826565

申请日：2017-11-29

Applicant: QUALCOMM Incorporated

Inventor： Dmytro Rusanovskyy ,  Adarsh Krishnan Ramasubramonian ,  Joel Sole Rojals

IPC: H04N19/70 ,  H04N19/50 ,  H04N1/64 ,  H04N19/17 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/12 ,  H04N19/136 ,  H04N19/46 ,  H04N21/431 ,  H04N19/39 ,  H04N21/47 ,  H04N19/52

Abstract: Provided are methods, apparatus, and computer-readable medium for processing video data using a video coding system that implements ST 2094-10 for modifying the color volume of a video signal. In various implementations, metadata blocks that include color volume transform parameters can be included in an encoded bitstream with an encoded video. Mastering display color volume parameters must also be included in the encoded bitstream when the color volume transform parameters are included in the bitstream. When the mastering display color volume parameters are not also included in the bitstream, all or part of the bitstream is non-conforming.

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：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：US10778978B2

公开(公告)日：2020-09-15

申请号：US15999393

申请日：2018-08-20

Applicant: QUALCOMM Incorporated

Inventor： Dmytro Rusanovskyy ,  Adarsh Krishnan Ramasubramonian ,  Marta Karczewicz

IPC: H04N19/124 ,  H04N19/85 ,  H04N19/117 ,  H04N19/98 ,  H04N19/186 ,  H04N19/169

Abstract: A method of processing video data including receiving video data, determining luma scale parameters for each of a plurality of ranges of codeword values for luminance components of the video data, performing a dynamic range adjustment process on the luminance components using the luma scale parameters, determining chroma scale parameters for chrominance components of the video data using a function of the luma scale parameters, and performing a dynamic range adjustment process on the chrominance components of the video data using the chroma scale parameters.