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Fast motion assessment method based on object texture

A fast motion and evaluation technology, applied in the field of video coding, can solve the problems of not using the shape characteristics of video objects, affecting motion estimation, and the diamond search method is easy to fall into local minimum points, etc.

Inactive Publication Date: 2007-06-20
SHANGHAI JIAOTONG UNIV
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Problems solved by technology

This algorithm has two obvious defects. One defect is that the algorithm does not take advantage of the shape characteristics of video objects, and it is proposed in the frame-based coding environment. If this fast motion estimation method is simply applied to object-based In video coding, the effect of motion estimation is sometimes affected by the boundary characteristics of video objects; another flaw is that the algorithm assumes that the global minimum point is around the zero vector, but in fact not all video sequences can satisfy this assumption , for sequences that cannot satisfy the assumptions, the diamond search method is easy to fall into a local minimum point, which makes the effect of motion estimation worse

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  • Fast motion assessment method based on object texture

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Embodiment Construction

[0034] Embodiments of the present invention are provided below in conjunction with the contents of the accompanying drawings and methods.

[0035] As shown in Figure 1, the present invention can be divided into the following steps.

[0036] (1) Motion estimation of boundary texture macroblocks

[0037] In the present invention, first judge whether the current macroblock is a boundary texture macroblock, if it is a boundary texture macroblock, then the motion estimation method for it is: when performing shape coding, retain the shape motion vector MVs of the corresponding BAB block, The motion vector MV of the boundary texture macroblock is searched in the range of ±1 with the position determined by the MVs in the reference frame as the center. If the BAB block corresponding to the boundary texture macroblock is an Intra coding mode, let MVs=(0,0).

[0038] Table 1 Comparison of running results of boundary texture macroblock motion estimation using different search methods (s...

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Abstract

A quick motion value-evaluation method of objects includes the following steps: 1, the motion evaluation of border streak macro-blocks: Taking the position determined by MV3 as the center in a reference frame to search for border streak macro-block motion vector within minus or plus sphere, if BAB corresponding to the macro-block is an in-frame encode mode, then MV3=(0,0), 2, the motion evaluation of opaque macro-block in the object includes the selection of the initial search point, determination of search sphere and judgment to the interrupt of the motion evaluation.

Description

technical field [0001] The invention relates to a method for motion estimation, in particular to a method for rapid motion estimation based on object texture, and belongs to the technical field of video coding. Background technique [0002] In the traditional international video coding standards, many two-dimensional rectangular frames are used to express the video sequence, and the entire rectangular frame is uniformly coded without distinguishing the specific objects in it. The expression of this video sequence makes the video encoder unable to operate on a specific object in the rectangular frame, which greatly limits the flexibility of video coding. In object-based video coding standards, the coding of rectangular frames is transformed into coding of video objects of arbitrary shape, independent behavior, and independent texture. Due to the introduction of the concept of video objects, three types of information of video objects need to be encoded during video encoding:...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N19/51
Inventor 张瑞周军余松煜支琤
Owner SHANGHAI JIAOTONG UNIV