An Improved Otsu Algorithm and its Application in the Detection of Laser Spot
In free space laser communication, correctly detecting and tracking on the energy center of beacon is a prerequisite and basis for communication. But in a real environment, as the impact of atmospheric turbulence, laser becomes highly divergent after transmission through the atmosphere, image in the CCD camera is the divergent speckle. Because of energy distribution of the divergent speckle, it is difficult to accurately locate the energy center of the main beam. In this paper, we consider that an image with a laser spot consists of a main spot, some speckles and background. Our purpose is extracting the main spot from complex background. That is, to extract the main spot as foreground and merge the speckles into background. We propose an improved Otsu algorithm, which uses twice consecutive the degree of energy approximation to control the number of recursive computation, then separates of the main spot and speckles to the greatest degree, finally obtains center coordinate of the laser spot utilizing a centroid algorithm. Experimental results demonstrate the feasibility and practicality of the proposed algorithm.
component laser spot laser communication otsu main spot
Xu Jing Fang ming Yang Huamin
School of Computer Science and Technology Changchun University of Science and Technology Changchun, China
国际会议
2010 International Conference on Future Information Technology(2010年未来信息技术国际会议 ICFIT 2010)
长沙
英文
533-536
2010-12-14（万方平台首次上网日期，不代表论文的发表时间）