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Method for estimating block matching motion of H.264 encode

A motion estimation and block matching technology, applied in the field of video image coding, can solve problems such as high hardware overhead, and achieve the effects of improving operation speed, improving search accuracy, and high flexibility

Inactive Publication Date: 2009-03-04
昆山杰得微电子有限公司
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Problems solved by technology

[0006] For hardware design, the fast search method needs to dynamically adjust the access area of ​​the storage unit data according to the search results of each step, and the hardware overhead is large.

Method used

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  • Method for estimating block matching motion of H.264 encode
  • Method for estimating block matching motion of H.264 encode
  • Method for estimating block matching motion of H.264 encode

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Embodiment Construction

[0013] The main basis of the method of the present invention is: the continuity of the motion of the video image and the integrity of the moving object in the image, thereby causing the motion vectors of adjacent macroblocks in the same frame image to have high temporal and spatial correlation, and can be based on the motion of the encoded block. vector to predict the motion vector of the current block. The search center is predicted by the motion vectors of adjacent blocks, and the center is further biased towards the global optimal point. In a small range near the global optimal point, the probability of finding the global optimal point will be greatly improved, thereby greatly improving the coding efficiency.

[0014] The process of the method of the present invention includes the steps of determining the adaptive search center, dynamically adjusting the size of the search area, and stopping in advance according to the search matching threshold, see figure 2 shown. The mo...

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Abstract

The invention discloses a block-matching motion estimation method for the coding of H.264, which comprises the following steps: motion vectors of four macroblocks which are adjacent to the current macroblock and comprise a left macroblock, a right macroblock, an upper left macroblock and an upper right macroblock in a video image are obtained; according to the motion vectors obtained, a searching center is determined; a searching scope is adjusted according to the average value of the motion vectors; and motion searching is carried out in the searching scope, and the minimum absolute error SAD rule is utilized to carry out matching and stop judgment ahead of schedule. The motion estimation method utilizes the strong associativity between the current macroblock of the image and the motion vectors of the adjacent macroblocks and can greatly improve searching accuracy, lower calculation complexity and increase calculation speed on the premise of basically no signal to noise ratio loss.

Description

technical field [0001] The invention relates to video image coding in the computer field, in particular to an adaptive block matching motion estimation method based on H.264 coding. Background technique [0002] H.264 is a video coding standard proposed by experts from ITU-T and ISO to achieve higher video compression ratio, better image quality and good network adaptability. Facts have proved that H.264 encoding has the characteristics of saving code stream more than other video compression standards, and is simpler than MPEG-4 algorithm. [0003] In order to improve coding efficiency, H.264 / AVC adopts many new technologies, one of which is that inter-frame coding adopts Block-Matching Motion Estimation (BMME, Block-Matching Motion Estimation) technology. The accuracy and timeliness of motion estimation based on block matching is one of the main factors affecting the overall performance of the encoder. The calculation of matching search for image blocks is very large, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N19/139H04N19/176H04N19/57
Inventor 仲巡黄小振欧阳合林晓芸葛志荣
Owner 昆山杰得微电子有限公司
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