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Global Motion Estimation Method and Device

A global motion and global motion vector technology, applied in the field of image processing, can solve problems such as large amount of calculation and inaccurate global motion vector, and achieve the effect of improving accuracy

Active Publication Date: 2020-01-17
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the global motion estimation of the image is performed by using the global motion vector estimation in the pixel domain and the hierarchical global motion vector estimation, but there is a problem that the calculation amount is large or the calculated global motion vector is inaccurate.

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  • Global Motion Estimation Method and Device

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Embodiment Construction

[0032] In the prior art, when performing global motion estimation, a pixel-domain global motion estimation method or a hierarchical global motion estimation method is usually used. in:

[0033] The global motion estimation process in the pixel domain can be defined as a process of finding the minimum value of the sum of squares of differences between each pixel point in the image of the current frame and the predicted point in the reference image. Therefore, in the global motion estimation method in the pixel domain, all the pixels in the current frame image are involved in the calculation, and there is a problem of large amount of calculation.

[0034] In the hierarchical global motion estimation method, the estimation of the global motion vector and the local motion vector are carried out independently, that is, in addition to the calculation of the local motion vector, the estimation of the global motion vector is also required. Therefore, there is also A problem with a la...

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Abstract

The invention provides an overall motion estimation method and a device. The method comprises steps of calculating a motion vector of each block of the previous frame of image; clustering all blocks of the previous frame image; and calculating to obtain a center of mass of a cluster and using the motion vector corresponding to the center of mass of the cluster as an overall motion vector of the current frame of image and outputting the overall motion vector. According to the invention, precision of the calculated overall motion vector can be improved and calculation resources are saved.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a global motion estimation method and device. Background technique [0002] The motion estimation method generally predicts the motion vector of the current block in the current frame image based on the motion vectors of the surrounding blocks in the current frame image, or the motion vectors of the blocks at similar positions in the previous frame image. The motion vectors of the surrounding blocks and the motion vectors of blocks at similar positions in the previous frame image only represent the local motion of the image, and cannot accurately reflect the global motion of the image. [0003] In order to solve the above problems, in the prior art, the method of adding global motion estimation on the basis of the motion vectors of surrounding blocks and the motion vectors of blocks at similar positions in the previous frame image is used to speed up the speed of...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/527
Inventor 王森林福辉罗小伟
Owner SPREADTRUM COMM (SHANGHAI) CO LTD