公开(公告)号：US11178399B2

公开(公告)日：2021-11-16

申请号：US16816016

申请日：2020-03-11

Applicant: QUALCOMM Incorporated

Inventor： Jie Dong ,  Amir Said ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/13 ,  H04N19/44 ,  H04N19/124 ,  H04N19/91

Abstract: An example method for entropy decoding of video data includes retrieving 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 for an independently codable unit of video data; determining, based on the pre-defined initialization value and in a linear domain, an initial probability state of the context; and entropy decoding, from a bitstream and based on the initial probability state of the context, a bin of the value for the syntax element.

公开(公告)号：US11134273B2

公开(公告)日：2021-09-28

申请号：US16560918

申请日：2019-09-04

Applicant: QUALCOMM Incorporated

Inventor： Marta Karczewicz ,  Muhammed Zeyd Coban ,  Jie Dong

IPC: H04N19/61 ,  H04N19/13 ,  H04N19/176

Abstract: A video decoder can be configured to determine a size of a transform unit, wherein the transform unit comprises N coefficient groups and each coefficient group comprises M coefficients, wherein M and N are integer values; determine a regular bin count threshold for the transform unit based on the size of the transform unit; context decode syntax elements for the transform unit until the first number of regular coded bins is reached; in response to reaching the first number of regular coded bins, bypass decode additional syntax elements of the transform unit; determine values for a first set of coefficients of the transform unit based on the context decoded syntax elements; and determine values for a second set of coefficients of the transform unit based on the additional syntax elements.

公开(公告)号：US20200267412A1

公开(公告)日：2020-08-20

申请号：US16560918

申请日：2019-09-04

Applicant: QUALCOMM Incorporated

Inventor： Marta Karczewicz ,  Muhammed Zeyd Coban ,  Jie Dong

IPC: H04N19/61 ,  H04N19/176 ,  H04N19/13

Abstract: A video decoder can be configured to determine a size of a transform unit, wherein the transform unit comprises N coefficient groups and each coefficient group comprises M coefficients, wherein M and N are integer values; determine a regular bin count threshold for the transform unit based on the size of the transform unit; context decode syntax elements for the transform unit until the first number of regular coded bins is reached; in response to reaching the first number of regular coded bins, bypass decode additional syntax elements of the transform unit; determine values for a first set of coefficients of the transform unit based on the context decoded syntax elements; and determine values for a second set of coefficients of the transform unit based on the additional syntax elements.

公开(公告)号：US20200007873A1

公开(公告)日：2020-01-02

申请号：US16459164

申请日：2019-07-01

Applicant: QUALCOMM Incorporated

Inventor： Muhammed Zeyd Coban ,  Jie Dong ,  Marta Karczewicz

IPC: H04N19/18 ,  H04N19/126 ,  H04N19/176 ,  H04N19/463 ,  H04N19/103 ,  H04N19/96

Abstract: The disclosure describes example techniques for determining a context used for encoding or decoding flags used to indicate a value of a coefficient. The techniques also relate to determining a quantization or dequantization factor to use for the coefficient. For determining the context and the quantization or dequantization factor, a video coder may determine values of flags used for encoding or decoding a previous coefficient and use the determined values of the flags for determining the context and the quantization or dequantization factor for the current coefficient.

公开(公告)号：US20190306534A1

公开(公告)日：2019-10-03

申请号：US16371605

申请日：2019-04-01

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/86 ,  H04N19/132 ,  H04N19/82 ,  H04N19/70

Abstract: A video encoder or video decoder may be configured to obtain a block of decoded video data, wherein the block of video data comprises a set of samples; apply a first filter operation to a first subset of the set of samples to generate a first subset of filtered samples; apply a second filter operation to a second subset of the set of samples to generate a second subset of filtered samples, wherein the first subset is different than the second subset; and output a block of filtered samples comprising the first subset of filtered samples and the second subset of filtered samples.

公开(公告)号：US20210076032A1

公开(公告)日：2021-03-11

申请号：US16929868

申请日：2020-07-15

Applicant: QUALCOMM Incorporated

Inventor： Nan Hu ,  Jie Dong ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/117 ,  H04N19/132 ,  H04N19/159 ,  H04N19/186 ,  H04N19/172

Abstract: As part of a process to encode or decode video data, a video coding device determines a value by applying an adaptive loop filter (ALF) to luma samples corresponding to a chroma sample of a current picture, the luma samples corresponding to the chroma sample being within a filter pattern that is the same for all chroma formats and types of chroma samples. A center coefficient of the filter pattern is applied to a collocated luma sample of the chroma sample. The video coding device adds the value to the chroma sample to determine a modified chroma value.

公开(公告)号：US20200296378A1

公开(公告)日：2020-09-17

申请号：US16816016

申请日：2020-03-11

Applicant: QUALCOMM Incorporated

Inventor： Jie Dong ,  Amir Said ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N19/13 ,  H04N19/91 ,  H04N19/124 ,  H04N19/44

Abstract: An example method for entropy decoding of video data includes retrieving 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 for an independently codable unit of video data; determining, based on the pre-defined initialization value and in a linear domain, an initial probability state of the context; and entropy decoding, from a bitstream and based on the initial probability state of the context, a bin of the value for the syntax element.

公开(公告)号：US20190116359A1

公开(公告)日：2019-04-18

申请号：US16158031

申请日：2018-10-11

Applicant: QUALCOMM Incorporated

Inventor： Jie Dong ,  Jianle Chen ,  Marta Karczewicz

IPC: H04N19/117 ,  H04N19/82 ,  H04N19/105 ,  H04N19/172

Abstract: A video decoder can be configured to determine a reconstructed image; apply a first filter to the reconstructed image to determine a first filtered image; based on the reconstructed image, determine parameters for a second filter; apply the second filter, using the parameters for the second filter, to the first filtered image to determine a second filtered image.

公开(公告)号：US11451840B2

公开(公告)日：2022-09-20

申请号：US16416815

申请日：2019-05-20

Applicant: QUALCOMM Incorporated

Inventor： Muhammed Zeyd Coban ,  Marta Karczewicz ,  Jie Dong

IPC: H04N21/2383 ,  H04L1/00 ,  H03M13/25

Abstract: An example device includes processing circuitry configured to determine a first state of a data structure, the first state representing a first quantizer applied to a previously quantized or inverse quantized value of a previous transform coefficient of residual data for a block of the video data and update the data structure to a second state according to the first state and a parity of a partial set of syntax elements representing a partial set of a plurality of coefficient levels for the previous transform coefficient. The processing circuitry is further configured to determine a second quantizer to be used to quantize or inverse quantize a current value of a current transform coefficient according to the second state of the data structure and quantize or inverse quantize the current value of the current transform coefficient using the second quantizer.

公开(公告)号：US11418790B2

公开(公告)日：2022-08-16

申请号：US16912315

申请日：2020-06-25

Applicant: QUALCOMM Incorporated

Inventor： Amir Said ,  Cheng-Teh Hsieh ,  Jie Dong

IPC: H04N19/13 ,  H04N19/103 ,  H04N19/124 ,  H04N19/176

Abstract: Techniques are described of hybrid coders that are configured to selectively use adaptive or non-adaptive coding techniques. A video coder (e.g., video encoder or video decoder) may code (e.g., encode or decode) first video data (e.g., a syntax element or value), for coding a first block, based on an adaptive context model (e.g., one or more adaptive context models) and code second video data, for coding a second block, based on a non-adaptive context model (e.g., one or more non-adaptive context models).