LINE SEGMENT EXTRACTOR
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专利名称：LINE SEGMENT EXTRACTOR
发明人：NISHIO SHUICHI,MAEJIMA TSUKASA 申请号：JP4865089
申请日：19890302
公开号：JPH02228779A
公开日：
19900911
专利内容由知识产权出版社提供
摘要：PURPOSE:To efficiently extract a line segment constituting an objective body from a density picture, where brightness and darkness is not made clear, by executing line thinning according to the density value of each picture element to the density edge picture and extracting the line segment for each range of a certain density value. CONSTITUTION:The line thinning is executed according to the density value of each picture element in an edge detection part 5 to the density edge picture, to which differentiation processing is executed. Then, since the line segment is extracted for each range of a certain line-thinned density value, the line segment can be extracted separately for a part, in which an edge is made clear, and a part in which the edge is not made clear. After the line segment is extracted in a line segment extraction part 6 concerning all points having a value more than a threshold value on a Hough plane after Hough transform, it is judged in a line thinning integration processing part 8 whether the line segment can be regarded same or not. Accordingly, the line segment corresponding to a point near the maximum point on the Hough plane can be extracted as well. Thus, even when the brightness and darkness is not made clear in the density picture, the line segment can be satisfactorily extracted.
申请人：N T T DATA TSUSHIN KK
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