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Device for obtaining width of Moire fringe by using image processing technology

A moiré fringe and image processing technology, applied in image data processing, image data processing, optical devices, etc., can solve the problems of low calculation accuracy, and the calculation amount of frequency domain processing algorithm is difficult to meet the speed requirements, and achieve high precision High, fast computing effect

Inactive Publication Date: 2013-08-21
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the methods for calculating Moiré fringes only need to include frequency calculation algorithm, threshold segmentation algorithm, etc. The threshold segmentation method has a fast calculation speed but low calculation accuracy, and the frequency domain processing algorithm has a large amount of calculation and cannot meet the speed requirements.

Method used

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  • Device for obtaining width of Moire fringe by using image processing technology
  • Device for obtaining width of Moire fringe by using image processing technology
  • Device for obtaining width of Moire fringe by using image processing technology

Examples

Experimental program
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Effect test

Embodiment 1

[0049] like Figure 3a shown, the straight line a j The intersection o of (j=1, 2...m) is selected at the darkest position in the central area of ​​the Moiré fringe image, and the line family a j (j=1, 2...m) are uniformly distributed in the range of 360°, and the interval angle between adjacent straight lines is 0.3°, 0.4°, or 0.5°.

[0050] Take the straight line a j The pixel value x of each point on the moiré image through the position ij (i=1, 2...n); use formula (1) to calculate straight line a j Orientation image gray value root mean square error σ j ;

[0051] σ j = 1 n - 1 Σ i = 1 n ( x ij - x ...

Embodiment 2

[0056] straight line a j The intersection o of (j=1, 2...m) is selected at the brightest position in the central area of ​​the Moiré fringe image, and the line family a j (j=1, 2...m) contains two sets of straight lines a c (c=1, 2...l) (ld (d=1, 2...p) (p=m-1).

[0057] line group a c (c=1, 2...l) are uniformly distributed in the range of 360°, and the interval angle between adjacent straight lines is 1°, 1.5° or 2°.

[0058] Take the straight line a c The pixel value x of each point on the moiré image through the position ic (i=1, 2...n); use formula (11) to calculate the straight line a c Orientation image gray value root mean square error σ c ;

[0059] σ c = 1 n - 1 Σ i = 1 n ( x ...

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Abstract

The invention relates to a device for obtaining the width of a Moire fringe by using an image processing technology. The device comprises a device for acquiring an image of the Moire fringe, a device for obtaining the direction of the Moire fringe and a device for calculating the width of the Moire fringe, wherein the device for obtaining the direction of the Moire fringe defines a group of straight lines aj which are intersected into the same point on the image of the Moire fringe, obtains image gray value root mean square errors sigma j in the direction of the straight lines alpha j by using pixel values xij of each point on the image of the Moire fringe at positions where the straight lines aj pass, and uses a straight line au which corresponds to the minimum image gray value root meansquare error sigma u in the sigma j as the direction of the Moire fringe. According to gray values of pixel points on the image of the Moire fringe which is acquired by a computer, the device provided by the invention automatically identifies a direction angle of the Moire fringe, calculates the width of the Moire fringe, is high in calculation speed and high in accuracy, and can be widely applied to the fields of small-angle accurate measurement, photoelectric displacement accurate measurement and the like.

Description

technical field [0001] The invention relates to a device for obtaining the width of moire fringes, in particular to a device for obtaining the width of moire fringes by using image processing technology. technical background [0002] Moiré fringe has the optical characteristics of high magnification magnification. The measurement of moire fringe displacement can realize high-precision detection. It has important application prospects in the fields of ship hull modification and machine tool processing. actual meaning. [0003] At present, the methods for obtaining Moiré fringes only include frequency obtaining algorithms, threshold segmentation algorithms, etc. The threshold segmentation method has a faster calculation speed but lower calculation accuracy, and the frequency domain processing algorithm has a large amount of calculation and cannot meet the speed requirements. Therefore, how to find a fast and accurate algorithm to obtain the Moiré fringe width has become an ur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00G06T7/00G01B11/02G01B11/26
Inventor 王明佳武治国韩广良李桂菊
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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