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Method for improving triangulation accuracy

A triangular ranging and precision technology, applied in the field of measurement, can solve the problems of large interference and noise, poor accuracy and stability, and large amount of data calculation, and achieve the effects of high-precision measurement, low cost, and simple process.

Pending Publication Date: 2021-01-08
SHANGHAI LANBAO SENSING TECH
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of these methods are that the influence of interference and noise is relatively large, the image fluctuation is relatively large, the amount of data calculation is relatively large, the accuracy and stability are poor, and the color sensitivity is poor.

Method used

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  • Method for improving triangulation accuracy
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  • Method for improving triangulation accuracy

Examples

Experimental program
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Effect test

Embodiment Construction

[0029] According to one or more embodiments, the traditional algorithm calculation method is changed to:

[0030]

[0031] The principle of the algorithm is: on the basis of the original traditional algorithm, subtract the set threshold from all the pixel values ​​involved in the centroid calculation, and then perform the calculation. The specific effect of the algorithm formula is as follows:

[0032] For the standard Gaussian distribution waveform, the algorithm does not affect the pixel centroid position, but can reduce the maximum data calculation value to about 20% of the original. Measurement curve such as figure 1 Shown:

[0033] The measurement data are shown in Table 1 below:

[0034]

[0035] Note, in this example, Yth=110, A and B are 1, C=0, Yth=110, so S=5 and F=15 involved in the operation of the new algorithm. The calculation steps required by the two methods are the same. For the grayscale centroid algorithm The result is significantly greater than ...

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Abstract

The invention provides a method for improving triangulation accuracy. The method comprises a calculation formula, wherein S and F represent pixel position value ranges, A, B and C are coefficient factors, Xi is a pixel serial number, Yi is a pixel amplitude, Yth is a pixel threshold, and X is a centroid position.

Description

technical field [0001] The invention belongs to the technical field of measurement, and in particular relates to a method for improving the accuracy of triangular ranging. Background technique [0002] The principle of laser triangulation distance measurement is that the laser emits a beam of laser light that hits the object to be measured and reflects it back, and it is imaged on the CCD (imaging screen) through the lens, and the measured distance is obtained by the similarity of the geometric relationship triangle. [0003] z=bf / x where, [0004] b is the distance between the optical axis of the laser and the optical axis of the receiving lens; [0005] f is the focal length of the receiving lens; [0006] x is the distance from the receiving image point to the optical axis of the lens. [0007] Among them, if b and f are known, the distance z can be obtained only by measuring the value of x. [0008] The measurement of x is accomplished with a high-resolution linear a...

Claims

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Application Information

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IPC IPC(8): G01S17/48
CPCG01S17/48
Inventor 许永童许用疆谢勇张姣姣
Owner SHANGHAI LANBAO SENSING TECH