A device for obtaining the width of moiré fringes by using image processing technology

A moiré fringe and image processing technology, which is applied in the direction of image data processing, image data processing, and optical devices, can solve the problems of frequency-domain processing algorithm calculations that cannot meet the speed requirements and low calculation accuracy, and achieve calculation Fast and precise results

Inactive Publication Date: 2011-12-21
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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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 used

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  • A device for obtaining the width of moiré fringes by using image processing technology
  • A device for obtaining the width of moiré fringes by using image processing technology
  • A device for obtaining the width of moiré fringes by using image processing technology

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Experimental program
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Embodiment 1

[0049] Such as Figure 3a As shown, the straight line a j The intersection point 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 evenly distributed within the range of 360°, and the interval angle between adjacent straight lines is 0.3°, 0.4°, or 0.5°.

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

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

Embodiment 2

[0056] line family a j The intersection point 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-l).

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

[0058] Take the line a c The pixel value x of each point on the Moiré fringe image passing through the position ic (i=1, 2...n); Utilize formula (11) to calculate straight line a c Direction 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 moiré fringes, in particular to a device for obtaining the width of moiré fringes by using image processing technology. technical background [0002] Moiré fringes have the optical characteristics of high magnification. Using the measurement of Moiré fringe displacement can achieve high-precision detection. It has important application prospects in the field of hull deformation and machine tool processing. Therefore, it is very good to quickly and accurately calculate the direction angle and width of Moiré fringes. actual meaning. [0003] The current methods for obtaining Moiré fringes only include frequency calculation algorithms, threshold segmentation algorithms, 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. Therefore,...

Claims

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Application Information

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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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