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：US20160301939A1

公开(公告)日：2016-10-13

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

CPC classification number: H04N19/197 ,  H04N19/124 ,  H04N19/136 ,  H04N19/137 ,  H04N19/14 ,  H04N19/152 ,  H04N19/16 ,  H04N19/176 ,  H04N19/184

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.

Abstract translation: 公开了用于显示流压缩（DSC）的量化参数（QP）更新分类技术。 一方面，一种用于确定量化参数（QP）值的方法包括确定当前块是否包括从平坦区域到复杂区域的过渡，或者是平坦块，并且确定先前块是否包括从平坦区域 到一个复杂的区域或是一个平坦的块。 该方法还可以包括基于先前和当前块是否包括从平坦区域到复杂区域的过渡来选择用于计算当前块的QP调整值的默认技术或替代技术，或者是平坦块。

公开(公告)号：US20150358645A1

公开(公告)日：2015-12-10

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 ,  H04N19/119 ,  H04N19/186 ,  H04N19/159 ,  H04N19/176 ,  H04N19/105 ,  H04N19/13

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.

Abstract translation: 公开了用于显示流压缩（DSC）的熵编码技术。 一方面，视频数据的熵编码方法包括至少部分地基于块的编码模式将视频数据的块划分成多个采样组。 所述方法还包括响应于所述至少一个组中的所有样本等于预定值而对所述组中的至少一个组执行基于组的跳跃来对所述块进行熵编码。

公开(公告)号：US20140219573A1

公开(公告)日：2014-08-07

申请号：US14170463

申请日：2014-01-31

Applicant: QUALCOMM Incorporated

Inventor： Chia-Yuan Teng ,  Natan Haim Jacobson

IPC: G06T9/00

CPC classification number: G06T9/00 ,  H04N19/94

Abstract: Certain aspects relate to systems and techniques for compressing image data using pattern mode compression schemes. A pattern mode compression scheme can reduce the amount of data stored in a frame buffer to reduce power costs of an image display system. In some implementations, pattern mode compression can be suitable for compression of pixel blocks having a limited color palette with one or more pixels of a different foreground color, and a slope-enabled pattern compression can be suitable for compression of pixel blocks having a gradient. Input pixel values can be compared against a dynamically-populated, fixed size pattern entry database to determine whether pattern mode compression or slope-enabled pattern mode compression should be used to compress the image block.

Abstract translation: 某些方面涉及使用模式模式压缩方案来压缩图像数据的系统和技术。 模式模式压缩方案可以减少存储在帧缓冲器中的数据量，以降低图像显示系统的功率成本。 在一些实现中，图案模式压缩可适用于具有具有不同前景颜色的一个或多个像素的有限调色板的像素块的压缩，并且斜率启用图案压缩可适用于具有梯度的像素块的压缩。 可以将输入像素值与动态填充的固定大小的模式条目数据库进行比较，以确定是否应使用模式模式压缩或斜率启用模式压缩来压缩图像块。

公开(公告)号：US10979705B2

公开(公告)日：2021-04-13

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 ,  H04N19/593 ,  H04N19/112 ,  H04N19/159 ,  H04N19/174 ,  H04N19/182

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.

公开(公告)号：US10432936B2

公开(公告)日：2019-10-01

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 ,  H04N19/115 ,  H04N19/152 ,  H04N19/176 ,  H04N19/186 ,  H04N19/184

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：US10284849B2

公开(公告)日：2019-05-07

申请号：US15092434

申请日：2016-04-06

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/14 ,  H04N19/15 ,  H04N19/176 ,  H04N19/124 ,  H04N19/184 ,  H04N19/129 ,  H04N19/46 ,  H04N19/61

Abstract: Techniques for quantization parameter (QP) for display stream compression (DSC) based on complexity measure are disclosed. In one aspect, a method for determining a QP value includes determining a complexity value of a plurality of previous blocks and selecting a technique from a plurality of defined techniques for calculating a QP adjustment value for a current block based on the determined complexity value. The method may further include calculating the QP adjustment value for the current block via the selected technique and determining the QP value for the current block based on the QP adjustment value.

公开(公告)号：US10244255B2

公开(公告)日：2019-03-26

申请号：US15078792

申请日：2016-03-23

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/593 ,  H04N19/147 ,  H04N19/174 ,  H04N19/11 ,  H04N19/186 ,  H04N19/124 ,  H04N19/625 ,  H04N19/61 ,  H04N19/423 ,  H04N19/112 ,  H04N19/159 ,  H04N19/15 ,  G09G5/02 ,  G09G5/00

Abstract: A method and apparatus for coding video information are disclosed. In one example, the method may involve: identifying one or more prediction modes for a fixed-rate codec, each prediction mode having a rate-distortion cost; and selecting, for a current block, a prediction mode that has the lowest rate-distortion cost from among the one more prediction modes not previously selected. The method may involve: (i) determining whether the selected prediction mode would result in overflow or underflow of a buffer of the fixed-rate codec; and (ii) determining whether the selected prediction mode would result in remaining bits in the slice being insufficient to code remaining blocks of the slice. The method may involve utilizing a fallback mode to code the current block in response to each of the selected one or more prediction modes resulting in at least one of conditions (i) and (ii) being true.

公开(公告)号：US20180302651A1

公开(公告)日：2018-10-18

申请号：US15950504

申请日：2018-04-11

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/65 ,  H04N19/176 ,  H04N19/124 ,  H04N19/46 ,  H04N19/91

Abstract: A method of content compression including receiving a first block of samples including at least a first sample and a second sample, calculating a predictor value for the first block of samples, calculating a residual between the predictor value and the first sample, quantizing the residual to generate a quantized residual, de-quantizing the quantized residual to generate a de-quantized residual, reconstructing the first sample using the de-quantized residual and the predictor value to generate a first reconstructed sample, calculating an error value based on the first sample and the first reconstructed sample, and modifying the second sample by the error value.

公开(公告)号：US09979970B2

公开(公告)日：2018-05-22

申请号：US14820404

申请日：2015-08-06

Applicant: QUALCOMM Incorporated

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

IPC: H04N19/152 ,  H04N19/119 ,  H04N19/176 ,  H04N19/124 ,  H04N19/174

CPC classification number: H04N19/152 ,  H04N19/119 ,  H04N19/124 ,  H04N19/174 ,  H04N19/176

Abstract: In one example, there is provided a method that includes coding a block within a slice of video data. The slice may comprise one or more blocks of the video data. The method further includes storing bits corresponding to the block in a buffer, determining information indicative of a position of the block within the slice, and determining fullness of the buffer based at least in part on the position of the block within the slice.