Motion vector self-selection method for image stream file compression

A technology of motion vector and file compression, which is applied in the field of image processing, can solve the problems of low-reliability coding block search center, high coding efficiency, and does not take into account the reliability of motion vectors in coding blocks, so as to reduce search complexity and improve The effect of accuracy

Active Publication Date: 2021-09-28
KANGDA INTERCONTINENTAL MEDICAL EQUIP CO LTD
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  • Summary
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Problems solved by technology

However, the PMV decision-making process in this relatively fixed selection mode does not take into account the reliability of the motion vectors in the adjacent coding blocks. In the case of low reliability, it cannot be used as the search center of the current coding block very accurately. If the current The search center of the coding block is accurate, which will make the coding efficiency higher

Method used

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  • Motion vector self-selection method for image stream file compression
  • Motion vector self-selection method for image stream file compression
  • Motion vector self-selection method for image stream file compression

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Embodiment 1

[0037] When encoding an image stream file, the smaller the encoding block is selected, the higher the encoding efficiency is. At the same time, since the motion of the image frames in the image stream file (a video file composed of successive image frames) is coherent and has a certain motion trend consistency, the selected coding block (that is, the target in the present invention) There is a strong correlation between the motion vector (MV) of a coded block) and the set of motion vectors (MVs) of neighboring coded blocks. Therefore, the predicted motion vector (PMV) can be based on the judgment of the direction bias of the motion vector on the feature points of the coding block, so that the motion vector with better consistency with the image motion direction can be selected and added to the candidate list, thereby improving the confidence and accuracy of the obtained PMV. Coding efficiency.

[0038] In the existing H.265 / HEVC, the fast search algorithm of TZ search is comm...

Embodiment 2

[0081] In order to better verify and research the technical content of the present invention, this embodiment uses a simulation experiment to verify the present invention, by comparing the motion vector self-selection method proposed by the present invention with the rate-distortion and Computational complexity is used to verify the performance of the algorithm. The experimental test uses standard H.265 / HEVC video sequences, which have different resolutions and image texture characteristics. The configuration of the simulation experiment environment is shown in Table 1:

[0082] Table 1: Simulation experiment environment

[0083]

[0084] In order to evaluate the performance of the algorithm proposed in this patent, BD-BR and BD-PSNR are still used as the evaluation criteria of the algorithm performance, and the computational complexity (CI) of encoding is measured by the average encoding time.

[0085]

[0086] where T HM (QP i ) and T pro (QP i ) respectively repr...

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Abstract

The invention discloses a motion vector self-selection method for image stream file compression, which relates to the technical field of image processing and mainly comprises the following steps: acquiring a candidate list of motion vectors of a target coding block through an AMVP technology; based on a corresponding relation between a time candidate motion vector and a space candidate motion vector and a difference relation between a first angular motion vector and a third angular motion vector in the candidate list, selecting a predicted motion vector, or selecting the predicted motion vector after screening the motion vectors added in the candidate list; and performing motion estimation according to the predicted motion vector, and performing compression processing on an image stream file according to an estimation result. According to the invention, the direction deviation is judged by utilizing the motion vector of the edge adjacent coding block, so that the angular motion vector close to the motion direction deviation is selected and added into the candidate list, and the confidence coefficient of the finally selected predicted motion vector is improved.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a motion vector self-selection method for image stream file compression. Background technique [0002] Compared with H.264 / AVC, a highly compressed digital video encoder standard, in order to further improve coding efficiency, new coding tools are introduced in H.265 / HEVC, such as the maximum The size is expanded from 16×16 to 64×64, the intra-frame coding prediction mode is increased from 9 to 35, and the prediction of the motion vector (MotionVector, MV for short) of the current coding block adopts Advanced Motion Vector Prediction (AMVP for short). ) technology, etc. Through in-depth research, it is found that the number of candidate MVs selected by the AMVP technology used in H.265 / HEVC is small, and the prediction motion vector (Prediction Motion Vector, PMV for short) of the current coding block can be obtained from the adjacent coding block (with the current The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/513H04N19/176
CPCH04N19/513H04N19/176
Inventor 蒋先涛蔡佩华张纪庄郭咏梅郭咏阳
Owner KANGDA INTERCONTINENTAL MEDICAL EQUIP CO LTD
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