公开(公告)号：US10356428B2

公开(公告)日：2019-07-16

申请号：US15092407

申请日：2016-04-06

Applicant: QUALCOMM Incorporated

Inventor： Vijayaraghavan Thirumalai ,  Natan Haim Jacobson ,  Rajan Laxman Joshi

IPC: H04N19/196 ,  H04N19/176 ,  H04N19/16 ,  H04N19/137 ,  H04N19/152 ,  H04N19/124 ,  H04N19/184 ,  H04N19/136 ,  H04N19/14

Abstract: Quantization parameter (QP) update classification techniques for display stream compression (DSC) are disclosed. In one aspect, a method for determining a quantization parameter (QP) value includes determining whether a current block includes a transition from a flat region to a complex region or is a flat block and determining whether a previous block includes a transition from a flat region to a complex region or is a flat block. The method may also include selecting a default technique or an alternative technique for calculating a QP adjustment value for the current block based on whether the previous and current blocks include a transition from a flat region to a complex region or are flat blocks.

公开(公告)号：US20170201753A1

公开(公告)日：2017-07-13

申请号：US15398567

申请日：2017-01-04

Applicant: QUALCOMM Incorporated

Inventor： Vijayaraghavan Thirumalai ,  Natan Haim Jacobson ,  Rajan Laxman Joshi

IPC: H04N19/154 ,  H04N19/60 ,  H04N19/103 ,  H04N19/174 ,  H04N19/186

CPC classification number: H04N19/154 ,  H04N19/103 ,  H04N19/117 ,  H04N19/12 ,  H04N19/147 ,  H04N19/174 ,  H04N19/176 ,  H04N19/186 ,  H04N19/60 ,  H04N19/85

Abstract: Systems and methods are disclosed for calculating a distortion value of a frame or block, in a number of color spaces, and determining an optimal coding mode based on the calculated distortion values. One embodiment includes a system having a video source that includes a video camera or a video archive that contains previously stored video content, and a processor configured to encode the stored video content.

公开(公告)号：US20160044308A1

公开(公告)日：2016-02-11

申请号：US14819306

申请日：2015-08-05

Applicant: QUALCOMM Incorporated

Inventor： Natan Haim Jacobson ,  Vijayaraghavan Thirumalai ,  Rajan Laxman Joshi ,  Min Dai

IPC: H04N19/105 ,  H04N19/112 ,  H04N19/182 ,  H04N19/159 ,  H04N19/174

CPC classification number: H04N19/105 ,  H04N19/112 ,  H04N19/159 ,  H04N19/174 ,  H04N19/182 ,  H04N19/593

Abstract: A method and apparatus for video coding with spatial prediction mode for multi-mode video coding is disclosed. In one aspect, the method includes coding a slice of video data, the slice including a plurality of pixels organized into a first line and a plurality of non-first lines. The coding of the slice further includes coding a current pixel of the first line in a spatial prediction mode using a previous pixel of the first line as a predictor and coding another pixel of a non-first line in a coding mode other than the spatial prediction mode.

Abstract translation: 公开了一种用于多模式视频编码的空间预测模式的视频编码方法和装置。 在一个方面，该方法包括对视频数据片进行编码，该片包括组织成第一行和多个非第一行的多个像素。 切片的编码还包括使用第一行的先前像素作为预测器在空间预测模式中编码第一行的当前像素，并且以空间预测以外的编码模式对非第一行的另一个像素进行编码 模式。

公开(公告)号：US10666984B2

公开(公告)日：2020-05-26

申请号：US15449755

申请日：2017-03-03

Applicant: QUALCOMM Incorporated

Inventor： Vijayaraghavan Thirumalai ,  Natan Haim Jacobson ,  Rajan Laxman Joshi

IPC: H04N19/91 ,  H04N19/13 ,  H04N19/182 ,  H04N19/48

Abstract: Methods and apparatus for coding video information having a plurality of video samples include partitioning samples into groups for transmission within a single clock cycle, wherein the samples are associated with a bit length B, and a group having a group size K. The sample group is mapped to a code number and coded to form a vector-based code comprising a first portion identifying a type of look-up-table used to performing the mapping, and a second portion representing the samples of the group. The look-up-table may be constructed based upon occurrence probabilities of different sample groups. In addition, different types of look-up-tables may be used for different B and K values.

公开(公告)号：US10574988B2

公开(公告)日：2020-02-25

申请号：US15353669

申请日：2016-11-16

Applicant: QUALCOMM Incorporated

Inventor： Vijayaraghavan Thirumalai ,  Natan Haim Jacobson ,  Rajan Laxman Joshi

IPC: H04N19/124 ,  H04N19/91 ,  H04N19/15 ,  H04N19/176 ,  H04N19/14 ,  H04N19/174 ,  H04N19/184

Abstract: Provided are systems and methods for adjusting quantization parameters of blocks of video data to be encoded, in order to reduce visual artifacts between slices of video data. Each slice includes one or more blocks organized in one or more lines, and can be coded independently without information from any other slices of video data. A complexity value of a current block corresponding to a last block of the slice on a particular line is determined and used to determine whether the current block includes a transition from a complex region to a flat region, wherein complex regions are characterized as having higher complexity in comparison to flat regions. In response to a determination that the current block includes such a transition, the QP for coding the current block may be decreased.

公开(公告)号：US10448024B2

公开(公告)日：2019-10-15

申请号：US15398567

申请日：2017-01-04

Applicant: QUALCOMM Incorporated

Inventor： Vijayaraghavan Thirumalai ,  Natan Haim Jacobson ,  Rajan Laxman Joshi

IPC: H04N19/154 ,  H04N19/174 ,  H04N19/186 ,  H04N19/103 ,  H04N19/60 ,  H04N19/176 ,  H04N19/147 ,  H04N19/117 ,  H04N19/12 ,  H04N19/85

Abstract: Systems and methods are disclosed for calculating a distortion value of a frame or block, in a number of color spaces, and determining an optimal coding mode based on the calculated distortion values. One embodiment includes a system having a video source that includes a video camera or a video archive that contains previously stored video content, and a processor configured to encode the stored video content.

公开(公告)号：US09936203B2

公开(公告)日：2018-04-03

申请号：US15078797

申请日：2016-03-23

Applicant: QUALCOMM Incorporated

Inventor： Natan Haim Jacobson ,  Vijayaraghavan Thirumalai ,  Rajan Laxman Joshi

IPC: G06K9/36 ,  H04N19/14 ,  H04N19/174 ,  H04N19/176 ,  H04N19/186 ,  H04N19/61 ,  H04N19/124

CPC classification number: H04N19/14 ,  H04N19/124 ,  H04N19/174 ,  H04N19/176 ,  H04N19/186 ,  H04N19/61

Abstract: A method and apparatus for detecting a complex region of an image are disclosed. In one example, the method may involve calculating complexity values for a current block, a next block, and a previous block. The method may involve: (i) detecting that the previous complexity value is less than a first threshold value, and that the next complexity value is greater than a second threshold value; and (ii) determining that neither a transition to the current block nor a transition to the previous block is a flat-to-complex region transition. The method may involve detecting a flat-to-complex region transition when transitioning to the next block in response to (i) and (ii).

公开(公告)号：US20170280139A1

公开(公告)日：2017-09-28

申请号：US15465328

申请日：2017-03-21

Applicant: QUALCOMM Incorporated

Inventor： Vijayaraghavan Thirumalai ,  Natan Haim Jacobson ,  Rajan Laxman Joshi

IPC: H04N19/124 ,  H04N19/105 ,  H04N19/176

CPC classification number: H04N19/124 ,  H04N19/105 ,  H04N19/126 ,  H04N19/15 ,  H04N19/152 ,  H04N19/176 ,  H04N19/197

Abstract: Methods and apparatus for coding video information having a plurality of video samples are disclosed. Blocks for video data are coded by an encoder based upon a quantization parameter (QP) for each block. The QP used for each block may be limited by a maximum QP value. A buffer fullness of a buffer unit may be determined that indicates of a ratio between a number of bits currently occupied in the buffer unit and a current capacity of the buffer unit. The encoder may determine an adjustment value for the maximum QP based upon the determined buffer fullness. By dynamically adjusting the maximum QP for coding blocks of video data, distortion from quantization may be reduced while preventing the buffer unit from overflowing or emptying.

公开(公告)号：US20170150150A1

公开(公告)日：2017-05-25

申请号：US15353669

申请日：2016-11-16

Applicant: QUALCOMM Incorporated

Inventor： Vijayaraghavan Thirumalai ,  Natan Haim Jacobson ,  Rajan Laxman Joshi

IPC: H04N19/124 ,  H04N19/15 ,  H04N19/91

CPC classification number: H04N19/124 ,  H04N19/14 ,  H04N19/15 ,  H04N19/174 ,  H04N19/176 ,  H04N19/184 ,  H04N19/91

Abstract: Provided are systems and methods for adjusting quantization parameters of blocks of video data to be encoded, in order to reduce visual artifacts between slices of video data. Each slice includes one or more blocks organized in one or more lines, and can be coded independently without information from any other slices of video data. A complexity value of a current block corresponding to a last block of the slice on a particular line is determined and used to determine whether the current block includes a transition from a complex region to a flat region, wherein complex regions are characterized as having higher complexity in comparison to flat regions. In response to a determination that the current block includes such a transition, the QP for coding the current block may be decreased.

公开(公告)号：US20170118473A1

公开(公告)日：2017-04-27

申请号：US15296998

申请日：2016-10-18

Applicant: QUALCOMM Incorporated

Inventor： Vijayaraghavan Thirumalai ,  Natan Haim Jacobson ,  Rajan Laxman Joshi

IPC: H04N19/13 ,  H04N19/15 ,  H04N19/46 ,  H04N19/50 ,  H04N19/625 ,  H04N19/132 ,  H04N19/124

CPC classification number: H04N19/13 ,  H04N19/119 ,  H04N19/122 ,  H04N19/124 ,  H04N19/132 ,  H04N19/15 ,  H04N19/176 ,  H04N19/182 ,  H04N19/186 ,  H04N19/436 ,  H04N19/46 ,  H04N19/50 ,  H04N19/625

Abstract: Provided are systems and methods for entropy encoding video data. A plurality of samples of a block of video data is partitioned into one or more groups of samples, based upon a coding mode of the block and a chroma subsampling image format of the samples. Entropy coding is performed on the block via performing a group-wise skip on at least one of the one or more groups in response to all of the samples in the at least one group having a value equal to a predetermined value, the group-wise skip comprising refraining from encoding the samples associated with the at least one group.