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首页> 《中国测试》期刊 >本期导读>飞秒激光烧蚀光斑轮廓提取及其链码描述研究

飞秒激光烧蚀光斑轮廓提取及其链码描述研究

210    2020-04-27

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作者:王福斌, 潘兴辰, 孙志林

作者单位:华北理工大学电气工程学院, 河北 唐山 063210


关键词:飞秒激光;光斑图像分割;Freeman链码;Huffman编码


摘要:

利用飞秒激光对单晶硅材料烧蚀加工时,TT开户:在烧蚀过程中会出现等离子体发光现象,为得到其中有价值的加工工艺信息,需要对其进行光斑轮廓信息的提取。该文使用Freeman链码描述光斑轮廓,并使用Huffman编码对图像链码进行压缩,减少图像特征处理计算量。首先,对光斑图像进行增强处理,采用多尺度Retinex增强法突出光斑核心区域的边界特征,使得光斑核心区域的形貌特征便于观察。其次,采用最大类间方差(Ostu)阈值分割方法对光斑核心区域目标的分割提取。最后,采用Canny+Gasussian方法分割光斑图像核心区域的轮廓,提取光斑轮廓的Freeman链码,并用Huffman编码对图像链码进行压缩。使用Huffman编码压缩后的链码串在进行计算时,速度快于直接采用Freeman链码计算时的速度。并且使用Huffman编码压缩后的链码串对图像进行描述时,可有效地减少计算量,节省大量时间。


Research on the contour extraction of spot ablated by femtosecond laser and its chain code description
WANG Fubin, PAN Xingchen, SUN Zhilin
College of Electrical Engineering, North China University of Science and Technology, Tangshan 063210, China
Abstract: When the single-crystal silicon material is ablated by femtosecond laser, plasma luminescence phenomenon occurs during the ablation process. In order to obtain valuable processing information, it is necessary to extract the spot contour information. In this paper, the Freeman chain code is used to describe the spot contour, and the image chain code is compressed by Huffman coding to reduce the amount of calculation at the image feature. Firstly, the spot image is enhanced, and the multi-scale Retinex enhancement method is used to highlight the boundary features of the core area of the spot, so that the topographical features of the spot core area are easy to observe. Secondly, the maximum inter-class variance (Ostu) threshold segmentation method is used to segment and extract the target of the spot core region. Finally, the Canny+Gasussian method is used to segment the contour of the core region of the spot image, extract the Freeman chain code of the spot contour, and compress the image chain code with Huffman coding. The chain code string compressed with Huffman coding is faster than the speed of the Freeman chain code calculation. And when the Huffman coded compressed chain code string is used to describe the image, the calculation amount is effectively reduced, and a large amount of time can be saved.
Keywords: femtosecond laser;image segmentation of spot;Freeman chain code;Huffman coding
2020, 46(4):116-122  收稿日期: 2019-10-04;收到修改稿日期: 2019-11-14
基金项目:
作者简介: 王福斌(1968-),男,山东菏泽市人,副教授,博士,研究方向为数字图像处理、机器视觉、飞秒激光微纳加工
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