公开(公告)号：US09900617B2

公开(公告)日：2018-02-20

申请号：US14743829

申请日：2015-06-18

Applicant: QUALCOMM Incorporated

Inventor： Marta Karczewicz ,  Wei Pu ,  Vadim Seregin ,  Li Zhang ,  Joel Sole Rojals ,  Feng Zou ,  Rajan Laxman Joshi

IPC: H04N19/119 ,  H04N19/00 ,  H04N7/00 ,  H04N19/593 ,  H04N19/503

CPC classification number: H04N19/593 ,  H04N19/503

Abstract: Techniques are described for palette-based video coding. In palette-based coding, a video coder may form a “palette” as a table of colors for representing video data of a particular area (e.g., a given block). Rather than coding actual pixel values (or their residuals), the video coder may code palette index values for one or more of the pixels that correspond to entries in the palette representing the colors of the pixels. A palette may be explicitly encoded, predicted from previous palette entries, or a combination thereof. In this disclosure, techniques are described for coding a block of video data that has a single color value using a single color mode as a sub-mode of a palette coding mode. The disclosed techniques enable a block having a single color value to be coded with a reduced number of bits compared to a normal mode of the palette coding mode.

公开(公告)号：US09877048B2

公开(公告)日：2018-01-23

申请号：US14733722

申请日：2015-06-08

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/91 ,  H04N19/105 ,  H04N19/119 ,  H04N19/13 ,  H04N19/132 ,  H04N19/136 ,  H04N19/157 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/46

CPC classification number: H04N19/91 ,  H04N19/105 ,  H04N19/119 ,  H04N19/13 ,  H04N19/132 ,  H04N19/136 ,  H04N19/157 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/46

Abstract: Entropy coding techniques for display stream compression (DSC) are disclosed. In one aspect, a method of entropy coding video data includes partitioning a block of the video data into a plurality of groups of samples based at least in part on a coding mode of the block. The method further includes entropy coding the block via performing a group-wise skip on at least one of the groups in response to all of the samples in the at least one group being equal to a predetermined value.

公开(公告)号：US09872040B2

公开(公告)日：2018-01-16

申请号：US14586805

申请日：2014-12-30

Applicant: QUALCOMM Incorporated

Inventor： Wei Pu ,  Marta Karczewicz ,  Joel Sole Rojals ,  Liwei Guo ,  Rajan Laxman Joshi ,  Feng Zou

IPC: H04N19/583 ,  H04N19/124 ,  H04N19/14 ,  H04N19/46 ,  H04N19/593 ,  H04N19/176 ,  H04N19/127 ,  H04N19/18 ,  H04N19/94 ,  H04N19/93

CPC classification number: H04N19/583 ,  H04N19/124 ,  H04N19/127 ,  H04N19/14 ,  H04N19/176 ,  H04N19/18 ,  H04N19/46 ,  H04N19/593 ,  H04N19/93 ,  H04N19/94

Abstract: In palette-based coding, a video coder may form a so-called “palette” as a table of colors representing the video data of a given block. The video coder may code index values for one or more pixels values of a current block of video data, where the index values indicate entries in the palette that represent the pixel values of the current block. A method includes determining a number of entries in a palette, and determining whether a block of video data includes any escape pixels not associated with any entry in the palette. The method includes responsive to determining that the number of entries is one, and that the block does not include any escape pixels, bypassing decoding index values for the pixel values of the block, and determining the pixel values of the block to be equal to the one entry in the palette.

公开(公告)号：US20170359583A1

公开(公告)日：2017-12-14

申请号：US15617844

申请日：2017-06-08

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/157 ,  H04N19/159 ,  H04L29/06 ,  H04N19/127 ,  H04N19/169 ,  H04N19/146 ,  H04N19/176

CPC classification number: H04N19/157 ,  H04L65/607 ,  H04L65/80 ,  H04N19/11 ,  H04N19/127 ,  H04N19/146 ,  H04N19/147 ,  H04N19/159 ,  H04N19/176 ,  H04N19/184 ,  H04N19/188 ,  H04N19/423 ,  H04N19/593

Abstract: An apparatus configured to encode video data comprising a memory configured to store a block of video data and one or more processors in communication with the memory. The one or more processors are configured to determine a coding mode for encoding the block of video data from among one or more coding modes, wherein the coding mode is determined based on a maximum syntax element size, encode the block of video data in a plurality of substreams according to the determined coding mode to create a plurality of encoded substreams of video data, store the plurality of encoded substreams of video data in respective balance first-in, first-out (FIFO) buffers, and multiplex the plurality of encoded substreams in a bitstream for transmitting to a video decoder.

公开(公告)号：US20170302932A1

公开(公告)日：2017-10-19

申请号：US15481228

申请日：2017-04-06

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/124 ,  H04N19/152 ,  H04N19/115 ,  H04N19/176 ,  H04N19/184 ,  H04N19/186

CPC classification number: H04N19/124 ,  H04N19/115 ,  H04N19/152 ,  H04N19/176 ,  H04N19/184 ,  H04N19/186

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 video data may be coded in a particular color space, such as YCoCg, wherein different QP values may be used for coding different color components of the video data. Because the human eye is generally more sensitive to differences in luma compared to chroma, and more sensitive to differences in chromatic green than chromatic orange, when the YCoCg color space is used to code the video data, different QP values may be determined for each color component channel. By coding each color component using different QP values, loss from quantization may be reduced while also reducing the appearance of visual artifacts in the coded video data.

公开(公告)号：US20170099495A1

公开(公告)日：2017-04-06

申请号：US15271922

申请日：2016-09-21

Applicant: QUALCOMM Incorporated

Inventor： Krishnakanth Rapaka ,  Vadim Seregin ,  Rajan Laxman Joshi ,  Marta Karczewicz ,  Cheng-Teh Hsieh

IPC: H04N19/513 ,  H04N19/105 ,  H04N19/46 ,  H04N19/523

Abstract: A device for decoding video data adds motion information of a neighboring block of a current block to a merge candidate list, wherein the motion information comprises a motion vector of the neighboring block, and wherein the motion vector refers to the current picture; receives an index indicating a merge candidate from the merge candidate list; and in response to the index indicating the merge candidate corresponding to the motion information of the neighboring block, predicts the current block using a lower precision motion vector that represents a rounded version of the motion vector of the neighboring block.

公开(公告)号：US20170085891A1

公开(公告)日：2017-03-23

申请号：US15266623

申请日：2016-09-15

Applicant: QUALCOMM Incorporated

Inventor： Vadim Seregin ,  Rajan Laxman Joshi ,  Krishnakanth Rapaka ,  Marta Karczewicz ,  Cheng-Teh Hsieh

IPC: H04N19/196 ,  H04N19/186 ,  H04N19/176

CPC classification number: H04N19/198 ,  H04N19/124 ,  H04N19/157 ,  H04N19/176 ,  H04N19/182 ,  H04N19/186 ,  H04N19/463 ,  H04N19/593

Abstract: An apparatus configured to decode video data that comprises a memory configured to store the video data; and one or more processors. The one or more processors are configured to: receive a bitstream that is constrained such that escape values used in a palette mode for decoding the video data are no greater than a maximum value, wherein the bitstream includes information for determining at least one escape value representing a sample in a block of the video data to be decoded; and reconstruct the sample in the block of the video data using the information for determining the at least one escape value.

公开(公告)号：US20160366439A1

公开(公告)日：2016-12-15

申请号：US15179758

申请日：2016-06-10

Applicant: QUALCOMM Incorporated

Inventor： Wei Pu ,  Marta Karczewicz ,  Feng Zou ,  Rajan Laxman Joshi ,  Vadim Seregin

IPC: H04N19/593 ,  H04N19/159 ,  H04N19/503 ,  H04N19/182 ,  H04N19/176

CPC classification number: H04N19/593 ,  H04N19/93

Abstract: Techniques are described for using pixel values of pixels in a neighboring block as part of palette mode coding. A video decoder may copy pixel values of a pixel in a last row or column of a neighboring block as predictor or reconstructed pixel values for a run of pixels as part of extended index copy run for palette mode coding. The pixel in the last row or column of the neighboring block is the same line as the run of pixels.

Abstract translation: 描述了使用相邻块中的像素的像素值作为调色板模式编码的一部分的技术。 作为用于调色板模式编码的扩展索引拷贝运行的一部分，视频解码器可将相邻块的最后一行或列中的像素的像素值复制为像素像素的预测或重构像素值。 相邻块的最后一行或列中的像素与像素运行相同。

公开(公告)号：US09503715B2

公开(公告)日：2016-11-22

申请号：US14472134

申请日：2014-08-28

Applicant: QUALCOMM Incorporated

Inventor： Chao Pang ,  Jianle Chen ,  Joel Sole Rojals ,  Rajan Laxman Joshi ,  Liwei Guo ,  Marta Karczewicz

IPC: H04N19/00 ,  H04N19/174 ,  H04N19/159 ,  H04N19/176 ,  H04N19/593 ,  H04N19/105 ,  H04N19/61

CPC classification number: H04N19/105 ,  H04N19/159 ,  H04N19/174 ,  H04N19/176 ,  H04N19/593 ,  H04N19/61

Abstract: A method of encoding video data includes determining that a current block of video data is to be encoded using an intra block copy (BC) mode and constrained intra prediction, determining one or more reference blocks that may be used for encoding the current block using the intra BC mode, wherein each of the one or more reference blocks is encoded with an intra prediction mode, and encoding the current block of video data using the intra BC mode and at least one of the determined one or more reference blocks.

Abstract translation: 一种编码视频数据的方法包括：使用块内复制（BC）模式和约束的帧内预测来确定视频数据的当前块要被编码，确定一个或多个参考块，其可以用于使用 在BC内模式中，其中一个或多个参考块中的每一个被以帧内预测模式编码，并且使用帧内BC模式和所确定的一个或多个参考块中的至少一个对当前视频数据块进行编码。

公开(公告)号：US09491463B2

公开(公告)日：2016-11-08

申请号：US13861319

申请日：2013-04-11

Applicant: QUALCOMM Incorporated

Inventor： Joel Sole Rojals ,  Rajan Laxman Joshi ,  Wei-Jung Chien ,  Jianle Chen ,  Vadim Seregin ,  Marta Karczewicz

IPC: H04N7/50 ,  H04N19/615 ,  H04N19/70 ,  H04N19/13 ,  H04N19/14 ,  H04N19/18

CPC classification number: H04N19/615 ,  H04N19/13 ,  H04N19/14 ,  H04N19/18 ,  H04N19/70

Abstract: A method of decoding data indicative of a subset of transform coefficients is described. The coefficients are indicative of a block of video data. The method may include determining that no transform coefficient in the subset of transform coefficients has an absolute value greater than one, and, based on the determining, skipping one or more decoding passes on the subset of transform coefficients, the decoding passes relating to decoding level information associated with the subset of transform coefficients.

Abstract translation: 描述了一种解码表示变换系数子集的数据的方法。 系数表示视频数据块。 该方法可以包括确定变换系数的子集中的变换系数不具有大于1的绝对值，并且基于确定，跳过变换系数子集上的一个或多个解码通过，与解码级相关的解码通过 与变换系数子集相关联的信息。