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教授

博士生导师

硕士生导师

任职 : 精密与特种加工教育部重点实验室 副主任; 中国光整加工专业委员会 主任委员; 中国生产工程学会 常务理事; 中国国际磨粒加工技术学会(ICAT)常务理事

性别:男

毕业院校:东北工学院

学位:博士

所在单位:机械工程学院

学科:机械制造及其自动化

办公地点:机械工程学院知方楼7185室

联系方式:0411-84706138 gaohang@dlut.edu.cn

电子邮箱:gaohang@dlut.edu.cn

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结合分层处理的激光光条亚像素中心提取方法

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发表时间:2022-10-06

发表刊物:红外与激光工程

所属单位:机械工程学院

卷号:46

期号:10

页面范围:225-232

ISSN号:1007-2276

摘要:A sub-pixel center extraction algorithm based on hierarchical processing was proposed for the implementation of laser stripe processing in the large aerospace parts measurement with high speed and precision. Firstly, the high-resolution image was compressed into low-resolution image with structural invariance. Then, the normal vector of the center of laser stripe was calculated by using quadratic curve fitting in the low-resolution image. The normal vector in the low-resolution image was reproduced to the high-resolution image based on the theory of normal regression. The judgment of gray center on normal direction was established to determine calculated pixels. The sub-pixel center of calculated pixels on the normal direction was accurately calculated by the gray weighted centroid method. Finally, the presented method was utilized to measure a composite material standard part and complex aviation parts in the laboratory and assembly testing machine, respectively. Experimental results show that the precision of the reconstruction of a single stripe on the surface of object is 0.269 mm and the precision of three-dimension surface measurement is 0.268 mm. It indicates that the proposed method can improve the speed and precision of the engineering measurement of large part. Moreover, the method can satisfy the requirements of the in-site measurement of large aerial parts.

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