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Method and apparatus for intra transform skip mode

A technology of transform skipping mode and inverse transform, which is applied in the field of video coding system, and can solve problems such as not helping to improve compression efficiency

Active Publication Date: 2015-02-25
HFI INNOVATION INC
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Problems solved by technology

However, for some residual data, 2D transformation may not help improve compression efficiency

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  • Method and apparatus for intra transform skip mode
  • Method and apparatus for intra transform skip mode
  • Method and apparatus for intra transform skip mode

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[0018] In video coding systems, 2D transforms are often used on residuals from inter / intra prediction to exploit redundancy between residual data. The 2D transform coefficients are converted to 1D data using the selected scan mode. The one-dimensional transformed data is processed by quantization to generate symbols to be compressed by entropy coding. The scan pattern is designed to properly convert two-dimensional data to one-dimensional data, and also to achieve good compression performance for subsequent entropy encoding. In the HEVC system, three scan modes are used for figure 2In the 4x4 and 8x8TUs shown, scan pattern 210 corresponds to diagonal scan from top right to bottom left, scan pattern 220 corresponds to horizontal scan from right to left, and scan pattern 230 corresponds to vertical scan from bottom to top. The scanning pattern starts at the locations indicated by open circles (212, 222, and 232) and ends at the locations indicated by solid circles (214, 224, ...

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Abstract

A method and an apparatus for video coding including an Intra transform Skip mode are disclosed. When the transform Skip mode is ON for a transform unit, embodiments according to the present invention apply different coding processes to the transform unit. The coding process with the transform Skip mode ON uses a different scan pattern from the coding process with the transform Skip mode OFF. According to various embodiments, the transform Skip mode is enabled when the transform unit size is 4x4, the prediction unit and the transform unit having the same size, or the prediction unit uses an intra 4x4 mode. When the transform Skip mode is enabled, a flag can be signaled in the bitstream to indicate the transform Skip mode selection. Furthermore, the flag can be incorporated in a picture level, a slice level or a sequence level of the video bitstream.

Description

[0001] Cross References to Related Applications [0002] This application claims the priority of the PCT patent application filed on June 7, 2012 with the application number PCT / CN2012 / 076581 titled "Improved Intra Transform Skip (Improved Intra Transform Skip)", and the objects of the above applications are hereby incorporated Reference. technical field [0003] The present invention relates to video coding systems. In particular, the present invention relates to a method and apparatus for integrating a transform skip mode video coding system for an intra-predicted transform unit (transform unit). Background technique [0004] Motion estimation (ME) is an efficient inter-frame coding technique to exploit temporal redundancy between video sequences. Motion-compensated (Motion-compensated, MC) interframe coding has been widely used in various international video coding standards. Motion estimation employed in various coding standards is generally a block-based technique, ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/159H04N19/176H04N19/70H04N19/12H04N19/127
Inventor 安基程赵亮郭峋雷少民
Owner HFI INNOVATION INC
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