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Quick global motion estimation method based on motion vector cancellation and differential principle

A technology of global motion and motion vector, applied in color TV parts, TV system parts, TV and other directions, can solve the problem that the coordinate matrix condition number cannot be guaranteed

Inactive Publication Date: 2009-06-10
ZHEJIANG UNIV
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Problems solved by technology

However, this fixed distance selection method does not guarantee the minimum condition number of the coordinate matrix

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  • Quick global motion estimation method based on motion vector cancellation and differential principle
  • Quick global motion estimation method based on motion vector cancellation and differential principle
  • Quick global motion estimation method based on motion vector cancellation and differential principle

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Embodiment Construction

[0045] Such as figure 1 As shown, a fast global motion estimation method based on the principle of motion vector cancellation and difference includes the following steps:

[0046] a. Input the current frame and reference frame of the video image, the current frame and the reference frame of the video image obtain the motion vector of each pixel of the video image through the optical flow method and form a motion vector field.

[0047] The corresponding motion vector MV(z) of any pixel in the motion vector field can be expressed as formula (1):

[0048] MV(z)=f(z|A,T)-z=(A-I)z+T (1)

[0049] In the formula, A is the transformation parameter of the global motion of the video image, T is the translation parameter of the global motion of the video image, I is the identity matrix, z=[x, y] T is the coordinates of any pixel in the video image.

[0050] b. Construct the global motion model of video image on motion vector field, global motion model is a four-parameter geometric mot...

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Abstract

The invention discloses a method for estimating quick global motion based on motion vector cancellation and a difference principle. The method comprises: firstly, inputting the current frame and a reference frame of a video image, and acquiring a motion vector of each pixel point of the video image by an optic flow method to form a motion vector field; secondly, constructing a global motion model of the video image on the motion vector field; thirdly, estimating a translation parameter T of global motion by utilization of the characteristic that motion vectors in diagonal and symmetrical positions on the motion vector field can cancel other motion components except a translation motion component; fourthly, estimating a conversion parameter A of the global motion by utilization of the difference principle of motion vector pairs on the same row and motion vector pairs on the same column on the motion vector field; and fifthly, substituting the translation parameter T and the conversion parameter A into the global motion model, and completing global motion estimation of the video image. The method greatly shortens the computation time under the condition of guaranteeing the estimation precision, and can be applied to a video processing system with higher real-time requirement.

Description

technical field [0001] The invention relates to the technical field of digital video processing, in particular to a fast global motion estimation method based on motion vector cancellation and difference principles. Background technique [0002] Camera movement is very common in everyday life. For example, shooting multiple images for panorama stitching, target object tracking in video surveillance applications, video shaking when making video calls with mobile phones, and video scene angle changes in video conferences, all of these processes include camera movement. The two-dimensional image motion caused by camera manipulation is called global motion. Modeling the global motion with a parameterized mathematical model and estimating its parameters is called global motion estimation. [0003] Global motion estimation plays a key role in areas such as image and video processing. In applications such as image registration and video moving object segmentation, global motion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/14H04N7/26H04N19/132H04N19/156H04N19/172H04N19/44
Inventor 田翔周凡袁龙涛
Owner ZHEJIANG UNIV
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