计算机工程2013，Vol.39Issue(1)：217-220,4.DOI:10.3969/j.issn.1000-3428.2013.01.047
改进的圆形标志亚像素级中心检测方法
Improved Method of Sub-pixel Centre Detection in Circle Mark
摘要
Abstract
Existing pixel level edge detection algorithm is dependent on image gray value, and the calculating neighborhood is not clear. Aiming at this problem, an improved method of sub-pixel centre of the circle mark in photogrammetry is proposed. The sub-pixel edge based on digital coarse boundaries using a dual threshold method is found by rotating image coordinate system according to the local gradient direction of the coarse boundaries. An adaptive parameter S in rotated coordinate system is used to search local sub-pixel edge points, and the centre of ellipses is detected on the basis of these points. The proposed algorithm is realized using Matlab, and the experimental results demonstrate its excellent performance and high precision in good agreement with that of the Steger edge algorithm. It is concluded that the new method can satisfy the demands in the opto-electronic measurement.关键词
编码标志/亚像素/边缘检测/椭圆拟合/梯度/自适应选择Key words
coding mark/ sub-pixel/ edge detection/ ellipse fitting/ gradient/ adaptive selection分类
信息技术与安全科学引用本文复制引用
许策,马杰,赵全明,唐红梅..改进的圆形标志亚像素级中心检测方法[J].计算机工程,2013,39(1):217-220,4.基金项目
国家自然科学基金资助项目(61203245) （61203245）
河北省自然科学基金资助项目(F2012202027) （F2012202027）
