ALGORITHM FOR SUBPIXEL EDGE POSITIONING AND PART SIZING UNDER COHERENT PROJECTION

被引：5
作者：
CIELO, P
VAUDREUIL, G
机构：
[1] The authors are with the National Research Council Canada, Industrial Research Institute, Boucherville, Que. J4B 6Y4
来源：
OPTICS AND LASER TECHNOLOGY | 1991年 / 23卷 / 02期
关键词：
EDGE POSITIONING; COHERENT SHADOW PROJECTION; SHADOW PROJECTION; EDGE DETECTION ALGORITHMS;
D O I：
10.1016/0030-3992(91)90019-K
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
An approach for subpixel edge positioning and part sizing by coherent shadow projection is described. Templates matching the Fresnel diffraction pattern at the shadow borders are used to locate precisely the edges by an iterative cross-correlation procedure. A similar procedure is followed to compensate for longitudinal displacements by monitoring their effects on the diffraction pattern. The performance is analysed in the presence of mechanical, optical and electronic perturbations. A resolution of nearly 0.015 pixels and an accuracy of 0.15 pixels have been obtained.
引用
收藏
页码：85 / 97
页数：13
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