Skip macroblock detection method and device

A detection method and macroblock technology, applied in the computer field, can solve problems such as large amount of calculation, and achieve the effect of reducing the amount of calculation

Active Publication Date: 2017-02-08
GUANGZHOU HUADUO NETWORK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of a very large amount of calculation when determining SKIP macroblocks in the prior art, an embodiment of the present invention provides a SKIP macroblock detection method and device

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  • Skip macroblock detection method and device
  • Skip macroblock detection method and device

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Embodiment Construction

[0064] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0065] Generally speaking, SKIP macroblocks are macroblocks with no pixel residuals and no motion vector residuals (ie, MVD=0). Especially in the case of static scenes or moving backgrounds, the proportion of SKIP macroblocks is very In the process of encoding, in order to reduce the code rate to a large extent, if the macroblock is known to be a SKIP macroblock, it is not necessary to perform DCT transformation or quantization on the SKIP macroblock, but only mark the SKIP macroblock , when decoding, just copy the corresponding macroblock from the reference frame directly according to the mark. It can be seen from this that the judgment of SKIP macroblocks is very important to improve the encoding effect and reduce the code rate. The ...

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Abstract

The invention discloses a method and device for detecting an SKIP macro block, and belongs to the technical field of computers. The method comprises the steps of acquiring the SAD between a current macro block and a current matched macro block in the process of motion search, detecting whether the SAD is smaller than an SAD experience threshold value corresponding to the quantization parameter of the current macro block in a root mode, stopping the motion research conducted on the current macro block and detecting whether the SAD is smaller than a secondary threshold value if the SAD is smaller than the SAD experience threshold value corresponding to the quantization parameter, and judging the current macro block to be the SKIP macro block if the SAD is smaller than the secondary threshold value. According to the method and device, the SAD of the current macro block is calculated only once or a few times, and when the SAD is smaller than the SAD experience threshold value corresponding to the quantization parameter of the current macro block and also smaller than the secondary threshold value, the current macro block can be determined to be the SKIP macro block. The problem that in the prior art, calculated quantity is very big when the SKIP macro block is determined is solved, and the effect of greatly lowering the calculated quantity is achieved.

Description

technical field [0001] The invention relates to the field of computer technology, in particular to a SKIP macroblock detection method and device. Background technique [0002] In H264 encoding, motion search accounts for more than 60% of the calculation of the entire encoding process, so improving the efficiency of motion search is of great significance to the encoding speed. A large number of statistics show that the number of residual-free macroblocks (SKIP macroblocks) in a frame of image accounts for 30-80% in non-scene switching and other pictures, so it is necessary to predict these SKIP macroblocks in advance. Make it skip the tedious process of motion search. [0003] The existing process of detecting SKIP macroblocks is as follows: first divide the current frame into macroblocks of 16 pixels*16 pixels, select a current macroblock on the current frame, and perform a motion search on the current macroblock in the reference frame. The best matching macroblock is dete...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/105H04N19/137H04N19/176H04N19/557
Inventor 张伟
Owner GUANGZHOU HUADUO NETWORK TECH
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