%0 Journal Article
%T An Optimized Freeman Chain Coding Method and Its Application to Engineering Drawing Plotting<br>一种优化的Freeman链码及其在工程图纸绘制中的应用
%A Wang Huiyuan
%A <br>王汇源
%J 中国图象图形学报
%D 1999
%I 
%X In this paper, we present an optimized Freeman chain coding method for bi level line structured images and discuss its application in the storage and automatic plotting of engineering drawings. Compared with the traditional Freeman chain coding that uses single ring or multi ring image quantizers, the proposed method is based on already quantized dot matrix digital images, and is a lossless coding method. We select the code length according to the statistics of the length of straight line segment in the image and thus minimize the average number of bits needed to encode the segment. Theoretical rate analysis and several experimental results show that the proposed method achieves lower bit rate than the existing one and can be easily applied to the storage and plotting of engineering drawings.
%K Vector chain
%K Freeman chain code
%K Bi
%K level images
%K Image encoding<br>矢量链
%K Freeman链码
%K 图象编码
%K 工程制图
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=D06194629680C940ACE75262F54B9D85&aid=48A44634809F86CDAE110C8C81D24E0F&yid=B914830F5B1D1078&vid=E158A972A605785F&iid=38B194292C032A66&sid=4D7D059FFBF006B9&eid=7ABC4505E3960D2B&journal_id=1006-8961&journal_name=中国图象图形学报&referenced_num=0&reference_num=0