FU Qin-wei,DU Xuan,ZHANG Yan,et al.Extraction of laser stripe center on translucent glue strip surface[J].Optics and Precision Engineering,2021,29(04):701-709.
FU Qin-wei,DU Xuan,ZHANG Yan,et al.Extraction of laser stripe center on translucent glue strip surface[J].Optics and Precision Engineering,2021,29(04):701-709. DOI: 10.37188/OPE.20212904.0701.
Extraction of laser stripe center on translucent glue strip surface
To solve the problem of unsuitability of the traditional laser stripe centerline extraction method for translucent objects, this study examines the extraction algorithm of laser stripe center on translucent strip surface to realize accurate measurement of the contour of the translucent strip. First, a comparative analysis of the laser stripes imaging mechanism of opaque and translucent glue strip was performed. Then, the one-dimensional gray-scale sequence of the translucent glue strip laser stripe was analyzed, and the difference in the peak distribution of the direct reflection component and the subsurface scattering component was elucidated, based on which the algorithm for extracting the laser stripe center of the translucent glue surface was proposed. The one-dimensional gray-scale sequence of the laser stripe was scanned and then the direct reflection component was extracted using mathematical morphology based on the value and distribution of the gray value peak. Finally, the gray barycenter method was used to windowing the direct reflection components in the gray sequence to extract the sub-pixel center position coordinates; the laser stripe center could be obtained via continuous scanning. Experimental results show that the average error of the laser stripe center extraction method reaches 3.197 pixels, and the average error after quadratic curve fitting is 0.714 pixels, which is better than the gray barycenter method without pretreatment. The proposed method can effectively extract the laser stripe center of translucent glue strip surface, which can help in laying the foundation for the contour measurement of translucent glue strip in the industrial field.
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