A Rapid Tracing Method for Linear Objects Skeleton from Colored Scanning Map
Cartographic feature vectorization was one of the most salient problems in the acquisition of geographic information from scanned topographic maps.lt was the main method to switch the image to a binary image or distribute the plate of colored map before vectorization. Or collect the geographic data from the separated original directly. But. It was inefficient, at the same time, it would lead to many consequences such as elements separation and data tattered. In order to remove the effects of map separating and thinning and extract the linear objects skeleton speedily and efficaciously from colored scanning map, this paper makes an analysis of characteristics of colored scanned maps, especially of liner objects. In view of the various appearances, an algorithm of part thinning and asynchronous operations is put forward. During the process of line tracing, a tracing window is open and it moves along the line. We can put part-image into the memory of the computer and do some thinning, and then judge what are the middle points and what are the intersections or the ends of the line. According to the idea, we can extract the whole geometric information of the lines. Examination is done in many different liner objects conditions and in the actual map digitization, the system that take the algorithm as the dominant factor is used by the author. It is proved that it is rapid and perfect to fellow lines on a 24bits scanning map in some actual data-extraction.
Image processing Thinning Line following Vector Data acquisition and update
LIU Xingui SUN Qun
Institute of Surveying and Mapping,Information Engineering University,P.R.China,450052
国际会议
成都
英文
93-97
2011-05-13（万方平台首次上网日期，不代表论文的发表时间）