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《Remote Sensing Technology and Application》 2004-03
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A Boundary Tracking Method Based on Preferential Direction for Searching

LIU Jia-hang~1, YANG Jian-feng~1, SHAN Xin-jian~2, YIN Jing-yuan~3(1.Space Optics Laboratory, Xi'an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences, Xi'an 710068, China; 2.Institute of Geology, CSB, Beijing 100029, China;3.Seismic Bureau of Shanghai, Shanghai 200062, China)  
In digital image processing, especially in region analying, boundaries and edges are very important information. In this work, the author presents a boundary tracking method based on the direction priority for searching. This method, whose the operation unit is region, takes the normal direction of the direction which is built by current boundary point and previous boundary point as the first direction to clockwise detect next boundary point in 4-neighbour or 8-neighbour of the current boundary point. When the tracking probe meets the first boundary point of the region, the tracking of this region is finished and begins the next tracking of next region. The boundary extracted with this method from image, not only retains the basic expectation of a boundary as a pixel width, connectivity and exactly locating on the contour of a region, present the periphery characteristic of a region, but also the boundary and inner-edge, which are caused by the holes in the region, can be easily separated from each other and either can be output as a thesis map for use. As the method taking well notice of the action which previous boundary points impact upon the posteriors, boundary points can keep their correlations. Because of these foundations, grid-formatted boundaries can be easily translated into vectors during the course of tracking following the requirement of application in practice.
【Fund】: 上海市科学技术基金2002年专项;; "十五"国家科技攻关项目和国家863计划共同资助。
【CateGory Index】: TP391.41
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