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Global motion estimation method and device

A global motion and motion vector technology, applied in the field of image and video coding

Inactive Publication Date: 2012-10-03
PEKING UNIV +2
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] In view of this, the embodiment of the present invention provides a global motion estimation method and device to solve the problem of low precision and poor accuracy of global motion estimation in the prior art

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  • Global motion estimation method and device

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Embodiment Construction

[0052] In order to effectively improve the precision and accuracy of global motion estimation, the embodiment of the present invention provides a method for global motion estimation, which includes: according to the attribute of the motion vector corresponding to each pixel in the current frame of the image to be estimated Information, at least one cluster is determined, wherein each cluster includes a plurality of pixels; the current frame is divided into multiple regions, and according to the number of pixels contained in each cluster in each region, it is determined that each cluster is in According to the distribution variance in the current frame, determine the cluster where the motion model input pixel is located according to the distribution variance; according to the macroblock segmentation mode where each pixel is located in the cluster where the input pixel is located and / or the amplitude of each pixel Angle information, select motion model input pixels; according to ...

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Abstract

The invention discloses a global motion estimation method and a device, being used for solving the problems of low accuracy and poor precision of global motion estimation in the prior art. In the method, at least a cluster is determined according to motion vector attribute information corresponding to each pixel point of current frame of an image to be estimated; the current frame is divided intoa plurality of areas, distribution variance of each cluster in the current frame is determined according to the number of the pixel points included in each cluster in each area, and the cluster in which a motion module input pixel is determined according to the distribution variance; the motion module input pixel is selected according to macro block partition and / or argument information of each pixel point in the cluster; parameters of a motion module are determined according to the input pixel point and the set motion module, and the position of the pixel point of a reference frame after motion compensation of the image to be estimated according to the parameters. The proposal provided by the invention excludes the interference and influence of local motion to global motion, thus providing the estimation with higher precision and more precise result.

Description

technical field [0001] The present invention relates to the technical field of image and video coding, in particular to a global motion estimation method and device. Background technique [0002] Global Motion Estimation (GME) is widely used in image and video processing such as image registration, computer vision, camera motion detection, object recognition and tracking, and content-based video coding. Global motion estimation methods in the prior art can generally be classified into the following categories: methods based on space domain, methods based on frequency domain, methods based on image features and textures, methods based on spatio-temporal slices, and so on. [0003] The method based on space domain is widely used, but due to the existence of interference pixels and noise, the accuracy of the estimation result is greatly affected. At the same time, due to the need for multiple iterations in the calculation process, the complexity of the calculation is increased...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N19/176H04N19/527
Inventor 吕品刘家瑛郭宗明
Owner PEKING UNIV
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