关键词: 轮廓提取, 模板匹配, 圆形目标, 阈值分割, 闭运算

Abstract: Serious deformation of the circular target can be caused by the existence of short distance and large deflection angle between the circular target and the image acquisition device. It will bring difficulty to the automatic detection of the target. A detection algorithm of close ranged circular target is figured?out. The close operation treatment is used for de-noising the background of images. The contour can be extracted by the extraction algorithm of nested double contour. Original contours can be got from all the contours by the contour feature extraction algorithm. The target contour is confirmed by detailed features of the original contours. Besides, the efficient detection of the target is implemented by adopting template matching algorithm to improve the efficiency and stability of the algorithm. The detection algorithm has been proven that it can effectively adapt to different environmental background and is very robust and real-time.

Key words: contour extraction, template match, circular target, threshold segmentation, closed operation