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Neighborhood correlated sub-pixel positioning method

A sub-pixel positioning and neighborhood-related technology, which is used in measurement devices, instruments, character and pattern recognition, etc., can solve the problems of large calculation amount and long processing time of the correlation method, and achieves fast processing speed, strong anti-interference ability, The effect of high positioning accuracy

Inactive Publication Date: 2010-10-27
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

Therefore, the calculation amount of the correlation method is very large, and the processing time of each frame is relatively long.

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  • Neighborhood correlated sub-pixel positioning method

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Embodiment Construction

[0029] The method of the present invention is further described in detail through the following examples.

[0030] A neighborhood-related sub-pixel positioning method, comprising the following steps:

[0031] Such as figure 1 As shown, first select the target template 1, the selection principle of the template size is just enough to cover the entire target spot to reduce the amount of processing calculations, the size is N×N, and the gray value g of each pixel is stored at the same time t ;

[0032] Then, according to the needs of the measurement range, select the required measurement area 2 on the CCD image surface, with a size of M×M. In order to reduce the amount of calculation, the area of ​​this area should be as small as possible under the condition of ensuring the measurement range. Store the measurement area every The gray value g of a pixel a ;

[0033] The target template is moved pixel by pixel in the selected CCD image surface measurement area, and the correlat...

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Abstract

The invention relates to a method for precisely positioning CCD facula, in particular to a neighborhood correlated sub-pixel positioning method. The method comprises the following steps: firstly, selecting a proper target template, and synchronously storing the gray value gt of each pixel; selecting a measurement area on the CCD image surface and storing the gt of each pixel in the measurement area; moving the target template pixel by pixel in the selected measurement area on the CCD image surface and synchronously carrying out correlated standardized algorithm, and recording the correlation coefficient C(x,y) of each pixel position; finding out the pixel position (X,Y) of the maximum correlation coefficient by comparison; selecting two points respectively in the areas adjacent to the facula position coordinates (X,Y), recording the correlation coefficients and calculating the correlation coefficients and respective coordinate figure thereof by the method of subdividing the adjacent areas to obtain the final precise facula position coordinate figure (X0,Y0). The method of the invention effectively improves the measuring preciseness, and compared with the traditional method, the amount of calculation is remarkably reduced and the method has good anti-interference property.

Description

technical field [0001] The invention relates to a method for precise positioning of CCD light spots, in particular to a sub-pixel positioning method using neighborhood correlation. Background technique [0002] In recent years, with the development of technology in the fields of national defense, industry, and construction in China, it is often necessary to perform high-precision measurement of small displacements or small deformations. So far, the detection method used is basically to use CCD imaging and then pixel positioning of the light spot. Therefore, the selection of pixel positioning algorithm is very important for the improvement of measurement accuracy. Generally, pixel positioning is divided into coarse positioning and fine positioning. Coarse positioning refers to determining the target to be measured in a specific area in the image. The algorithm is relatively difficult. There are a large number of recognition algorithms; fine positioning is sub-pixel positionin...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/64G01B11/00
Inventor 刘绍锦王志乾赵雁李建荣沈铖武刘畅耿天文李冬宁
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI