HU Tao, GUO Bao-ping, GUO Xuan, YANG Ou. Contour Feature Based on Image Registration[J]. Opto-Electronic Engineering, 2009, 36(11): 118
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A new image registration algorithm is presented based on contour-feature, which involves extracting the contour of the image, calculating the normal angle of each contour point and proceeding normal angle histogram statistics,then estimating quickly the rotation angle between two images by circular correlation of normal angle histograms. The estimation of rotation angle can simplify the estimation of other parameters and realize the quick registration. The proposed algorithm is invariant to image rotation, translation and scale, and robust to contour deletion and noise, which is extensive to be applicable to open contours and closed contours. Moreover, the proposed algorithm has been successfully applied in Printed Circuit Board (PCB) defect inspection to realize quick and exact registration of reference image contour and the testing image contour.