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A method and system for inter-frame image motion estimation based on code rate control

A rate control and motion estimation technology, applied in the field of image processing, can solve problems such as the increase of coding complexity, and achieve the effect of reducing calculation, reducing the amount of invalid calculation, and avoiding inefficiency

Active Publication Date: 2022-05-17
KANGDA INTERCONTINENTAL MEDICAL EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

H.265 / HEVC adopts hybrid coding technology. Compared with H.264 / AVC, its coding block size increases from 16×16 to 64×64, and the average coding compression rate increases by 55%-87%. However, its coding The complexity also increases

Method used

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  • A method and system for inter-frame image motion estimation based on code rate control
  • A method and system for inter-frame image motion estimation based on code rate control
  • A method and system for inter-frame image motion estimation based on code rate control

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Embodiment 1

[0038] Motion estimation is the process of finding the matching block corresponding to the current coding block in the reference image. In essence, it is the process of searching and determining the optimal displacement of the current coding block. Its basic idea is to divide each frame of the image sequence into many non-overlapping prediction units, select the coded image as the reference image, find the best matching reference block of the current coding block in the current image from the reference image, and Assume that all pixels within a block have the same amount of displacement. For each block, according to a certain matching criterion, find the matching block that is most similar to the current coding block within a specific search range of the reference frame, and the relative displacement between the matching block and the current coding block is the motion vector (Motion vector, MV ). The process of obtaining motion vectors in video coding is called motion estima...

Embodiment 2

[0068] In order to better understand the technical content of the present invention, this embodiment illustrates the technical content of the present invention in the form of a system structure, such as figure 2 As shown, an inter-frame image motion estimation system based on bit rate control, including:

[0069] A list obtaining unit, configured to obtain a motion vector candidate list of the current coding block based on the motion correlation in the space-time domain;

[0070] A central acquisition unit, configured to screen the motion vector candidate with the smallest cost in the motion vector candidate list based on the rate-distortion cost function as the predicted motion vector;

[0071] A center search unit, configured to perform a motion search centered on the predicted motion vector, and calculate the rate-distortion cost of the coded block obtained during the motion search process;

[0072] The vector obtaining unit is used for selecting the coding block with the...

Embodiment 3

[0082] In order to better verify the technical content of the present invention, in a preferred embodiment, a simulation experiment is used to verify the effect of the present invention. In this preferred embodiment, the standard reference model HM of H.265 / HEVC is adopted, random access (RA) configuration is used, and the values ​​of four quantization parameters (quantization parameters, QP) are: 22, 27, 32 , 37. By comparing the motion estimation method proposed by the present invention with the H.265 / HEVC reference software, the rate-distortion (BD-Rate) and the relative reduction of encoding time ΔT are used to verify the performance improvement percentage of the algorithm under the input of different series of video sequences. Where ΔT is calculated by the following formula:

[0083]

[0084] Among them, T vtm ,T pro are the motion estimation coding time of HM and the motion estimation method proposed by the present invention, respectively.

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Abstract

The invention discloses a method for estimating inter-frame image motion based on code rate control, which relates to the technical field of image processing and mainly includes the steps of: obtaining a motion vector candidate list of the current coding block based on motion correlation in the time-space domain; The cost function selects the motion vector candidate with the lowest cost in the motion vector candidate list as the predicted motion vector; performs motion search centered on the predicted motion vector, and calculates the rate-distortion cost of the coding block obtained during the motion search; After the code rate corresponding to the coding block exceeds the threshold, the coding block with the smallest rate-distortion cost is selected to obtain the motion vector. The invention uses the rate-distortion function to determine the optimal motion search center, and performs the second outward motion search based on the motion center, reducing the amount of invalid calculations caused by the disordered search in the traditional technology, and at the same time avoiding A region search with finite points may lead to local minimum trapping.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to an inter-frame image motion estimation method and system based on code rate control. Background technique [0002] Currently, high-resolution (4K×4K, 8K×8K) video applications are widely used, and more importantly, with the rapid development of the Internet, various video applications have been born. With the improvement of video application requirements, the current video coding technology is facing great challenges. The Joint Collaborative Team on Video Coding (JCT-VC) released a high-efficiency video compression standard H.265 / HEVC in 2013. H.265 / HEVC adopts hybrid coding technology. Compared with H.264 / AVC, its coding block size increases from 16×16 to 64×64, and the average coding compression rate increases by 55%-87%. However, its coding The complexity also increases. In video coding, the main purpose of inter-frame prediction between consecutive frames ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/147H04N19/176H04N19/52H04N19/567
CPCH04N19/147H04N19/176H04N19/52H04N19/567
Inventor 蒋先涛陈剑明谢英志王辉汪帅伊陆炎张纪庄郭咏梅郭咏阳
Owner KANGDA INTERCONTINENTAL MEDICAL EQUIP CO LTD