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Method for detecting all-zero blocks in H.264

A technology of reference block and coding block, applied in the field of video coding

Inactive Publication Date: 2012-07-25
XI AN JIAOTONG UNIV
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Problems solved by technology

[0010] Most of the existing all-zero block detection technologies detect all-zero blocks by judging the relationship between the sum of absolute errors (SAD) of 4×4 blocks and the preset threshold, while the coding characteristics of H.264 and the characteristics of the video itself Not considered, so there is still room for improvement in the detection rate of all-zero blocks

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  • Method for detecting all-zero blocks in H.264
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  • Method for detecting all-zero blocks in H.264

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Embodiment Construction

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0032] The present invention divides 4*4 residual blocks into two types: the first type is all-zero blocks, and the second type is non-all-zero blocks.

[0033] According to the coding characteristics of H.264, the reference block obtained through motion estimation is the most similar block to the current coding block, so the characteristics of the reference block (REF_AZB) can roughly reflect the characteristics of the current coding block. Statistics show that when the reference block is an all-zero block (REF_AZB=1), the average probability that the current coding block is an all-zero block is 84.99%; when the reference block is a non-all-zero block (REF_AZB=0), the current coding block is all-zero The average probability of a block is 31.31%. It can be seen from this that when the characteristics of the reference block are different, the characteristics ...

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Abstract

The invention provides a method for detecting all-zero blocks in H.264. Based on the relativity between a reference block and a current encoding block and by combining with an idea of mode recognition, a linear classifier for all-zero block detection is provided. Through carrying out all-zero block prejudgment before transform and quantization, the condition that a residual block coefficient is zero can be detected in advance, thereby omitting the transform and quantization process of a residual block. The method has an extremely great significance for encoding of a video with a low code rate, because the proportion of the all-zero blocks is very large under the condition of low code rate, and the calculation complexity of the transform and quantization can be greatly reduced if most of all-zero blocks are detected, thereby improving encoding efficiency.

Description

technical field [0001] The invention belongs to the technical field of video coding, and in particular relates to a method for detecting all-zero blocks in H.264. Background technique [0002] H.264 is a new-generation digital video coding standard proposed by JVT, a joint video team composed of experts from the International Telecommunication Union (ITU) and the International Organization for Standardization (ISO / IEC). Compared with the previous video coding standards, H.264 uses new coding technologies such as multiple prediction modes, 4×4 integer transformation, adaptive arithmetic coding, etc., and its coding efficiency is increased by more than 70%, but its computational complexity is very high , making it very difficult for the encoder to implement real-time encoding. Generally speaking, mode selection and motion estimation are the two parts with the highest complexity at the H.264 encoding end. In recent years, many fast mode selection and fast motion estimation me...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N7/46H04N7/50H04N19/142
Inventor 黄华王萍邓妍
Owner XI AN JIAOTONG UNIV
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