一种基于高斯拟合法的激光光束中心提取方法

doi:10.16180/j.cnki.issn1007-7820.2020.05.012

Abstract

Abstract:

In laser-assisted vision measurement system, the selection of fitting data in Gauss fitting method affects the accuracy of laser light center extraction. Aiming at the difficulty to determine the number of Gaussian fitting data in laser images under uneven illumination, an adaptive Gaussian fitting method based on random sampling consistency algorithm was proposed in this paper. According to the characteristic of gray-scale variation in background region of laser image, the random sampling consistency algorithm was used to estimate the gray-scale distribution model of background region. The outliers of the model were extracted as Gaussian fitting data. Then, the Gaussian fitting method was used to obtain the sub-pixel coordinates of the center point of the laser light. The experimental results showed that the Gaussian fitting data in the laser image had an average fitting coefficient of 0.934, which improved the accuracy of laser light center extraction compared with the Gaussian fitting method for fixed fitting data length.

Key words: structured light, laser light center, Gaussian fitting method, random sample consensus algorithm, image processing, vision measurement

CLC Number:

TN247

ZHANG Tianhao,LI Haolin. A Method of Laser Center Extraction Based on Gaussian Fitting[J].Electronic Science and Technology, 2020, 33(5): 72-76.

Figures/Tables 7

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Table 1

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Table 2

References 16

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	a	b	拟合长度	x_max	R²
1	-0.049 7	253.32	20	1 395.593	0.919
2	-0.051 0	253.85	16	1 395.630	0.931
3	-0.049 5	253.77	17	1 395.575	0.925
4	-0.049 8	254.46	16	1 395.543	0.931
5	-0.048 5	255.94	14	1 395.477	0.934
6	-0.048 2	254.86	18	1 395.512	0.935
7	-0.046 7	253.74	19	1 395.586	0.927
8	-0.048 5	253.62	16	1 395.566	0.923
标准差	0.001 23	0.859	1.727	0.127 2	0.005 15

行	固定拟合数据长度高斯拟合法
行	中心坐标	拟合长度	R²	中心坐标	拟合长度	R²
50	1 492.974	30	0.931	1 493.022	58	0.922
100	1 491.593	30	0.920	1 491.116	57	0.931
1 000	1 455.037	30	0.894	1 455.032	28	0.947
2 000	1 414.252	30	0.828	1 414.569	21	0.939
2 500	1 395.757	30	0.803	1 395.565	18	0.929
3 000	1 375.295	30	0.837	1 376.083	20	0.934
4 000	1 340.173	30	0.883	1 340.279	30	0.936
均值			0.871			0.934

A Method of Laser Center Extraction Based on Gaussian Fitting

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