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Video intraframe predictive coding method

A coding method and intra-frame prediction technology, applied in the field of image processing, can solve problems such as inability to eliminate image correlation, and achieve the effect of improving coding efficiency

Inactive Publication Date: 2011-06-29
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods are to eliminate the correlation between the current coding block and the image that has been decoded and reconstructed, but cannot eliminate the correlation with the image that has not been decoded and reconstructed.

Method used

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  • Video intraframe predictive coding method
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  • Video intraframe predictive coding method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The encoding process is:

[0040] (1) Encoding image summaries.

[0041] Write the image summary into the code stream. The specific method is to add a flag bit in the code stream syntax image header to indicate whether a new video lens appears. If a new video lens appears, the image summary is compressed according to lossless is written into the code stream in the same way; if a new video shot does not appear, there is no need to transmit the image summary.

[0042] (2) Calculate the predictive value in the image abstract prediction mode and the motion vector in the image abstract.

[0043] The original pixel value of the current coding block is searched for matching in the image summary, and the block with the smallest average absolute value difference is searched in the image summary as the best matching block of the current coding block, and the pixel value of the best matching block is used as the current coding The prediction value of the block in the image abstr...

Embodiment 2

[0076] The encoding process is:

[0077] (1) Encoding image summaries.

[0078] Write the image summary into the code stream, the specific method is as follows: add a flag bit in the code stream syntax image header to indicate whether a new video shot appears, if it is a new video shot, write the image summary according to the lossless compression written into the code stream.

[0079] (2) Calculate the predicted value in the image summary prediction mode.

[0080] The intra-frame prediction value of the coding block is the template of the current coding block. The best template matching block in the image summary is searched for the pixel value of the adjacent image block. The template of the current coding block is the pixel value located on the left and above of the current coding block. The L-shaped image area can also be a separate left or upper image area. This prediction mode is not used if neither left nor upper image regions exist. Such as figure 1 As shown in , ...

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Abstract

The invention belongs to the technical field of image processing, provides a video intraframe predictive coding method for intraframe prediction by using image hashing, and is characterized in that the image hashing for taking out the video lens is obtained for each video lens, predictive mode of image hashing is used in the image intraframe coding process for video lens, that is, intraframe prediction is carried out by using the image hashing so as to obtain intraframe predicted value that is then coded and written in code stream; and the image hashing of the video lens is coded and written in code stream. The invention uses image hashing information, can obviously improve the coding efficiency of video intraframe coding on the basis of the prior intraframe predictive coding, and is veryapplied to the application fields such as video editing and video flowing transmission.

Description

technical field [0001] The invention belongs to the technical field of image processing, in particular to a video intra-frame predictive encoding method. Background technique [0002] The current typical video coding algorithm adopts the hybrid coding technology framework based on prediction / transformation that has been used until now. Following this framework, two series of international video coding standards have been formulated: MPEG-X series and H.26X series, forming the H.264 A number of video coding standards represented by / AVC, AVS, VC-1, etc. have been widely recognized by the industry. Hybrid coding technology is based on Shannong information theory, uses classical set theory as a tool, and uses probability and statistics models to describe information sources. Its compression idea is based on data statistics, which can only remove data redundancy and completely ignore visual redundancy. Remain. The development of this technical framework has encountered a huge ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N7/32H04N19/11H04N19/147H04N19/44
Inventor 胡瑞敏王啟军王中元王师铮钟睿
Owner WUHAN UNIV