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Rotation of prediction residual blocks in video coding with transform skipping

A technology for transforming skipping and residual blocks, applied in the field of video decoding

Active Publication Date: 2015-03-25
QUALCOMM INC
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] Spatial or temporal prediction leads to predictive blocks of decoded blocks

Method used

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  • Rotation of prediction residual blocks in video coding with transform skipping
  • Rotation of prediction residual blocks in video coding with transform skipping
  • Rotation of prediction residual blocks in video coding with transform skipping

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Embodiment Construction

[0024] This disclosure describes techniques for coding residual data of a predicted residual block with transform skipping. Residual data for a residual block includes pixel difference values ​​between pixels of the video block to be coded and corresponding pixels of a prediction block generated for the block to be coded. When a residual block is coded using a lossless coding mode or a lossy coding mode in transform skip modes, the transform for the residual block may be skipped. When no transform is applied to the residual block, the residual data with energy higher than average (i.e., larger pixel difference values) may not be located at the upper left corner of the residual block, which is the case Entropy decoding expected.

[0025] When a transform for a residual block is skipped, entropy coding efficiency may be improved by rotating the residual block during encoding so as to position residual data with higher energy than average at the upper left corner of the residual...

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Abstract

Techniques are described for coding residual data of a prediction residual block with transform skipping. A transform may be skipped for a residual block when the residual block is coded using either a lossless coding mode or a lossy coding mode in a transform skip mode. According to the techniques, based on a transform being skipped for a residual block, a rotation unit included in a video encoder or a video decoder determines whether to rotate the residual block prior to coding residual data of the residual block. In some examples, a rotation value may be explicitly signaled between the video encoder and the video decoder. In other examples, the video encoder and the video decoder may each independently determine whether to rotate the residual block based on a type of boundary at two or more edges of the residual block.

Description

[0001] This application asserts U.S. Provisional Application Nos. 61 / 670,569, filed July 11, 2012, U.S. Provisional Application Nos. 61 / 815,148, filed April 23, 2013, and 61 / 833,781, each of which is incorporated herein by reference in its entirety. technical field [0002] This disclosure relates to video coding (ie, video encoding and video decoding) with transform skipping. Background technique [0003] Digital video capabilities can be incorporated into a wide range of devices, including digital television, digital broadcast systems, wireless broadcast systems, personal digital assistants (PDAs), laptop or desktop computers, tablet computers, e-book readers, digital Cameras, digital recording devices, digital media players, video game devices, video game consoles, cellular or satellite radiotelephones, so called "smart phones", video teleconferencing devices, video streaming devices and the like. Digital video devices implement video compression techniques such as the ...

Claims

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Application Information

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IPC IPC(8): H04N19/159H04N19/176H04N19/129H04N19/14H04N19/88
CPCH04N19/159H04N19/176H04N19/46H04N19/129H04N19/14H04N19/88H04N19/61
Inventor 瑞珍·雷克斯曼·乔许马尔塔·卡切维奇
Owner QUALCOMM INC
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