基于改进Hough变换的角点提取 :http://www.china-image.cn/lunwen/220060606191233225055022.html
《数字图像处理编程入门》: http://www-scf.usc.edu/~flv/ipbook/ 吕凤军硕士时期的作品
Hough检测直线,圆,椭圆的部分代码:http://dev.youkuaiyun.com/article/82/82821.shtm
http://www.ee.duke.edu/~jshorey
http://www.answers.com/topic/hough-transform
http://homepages.inf.ed.ac.uk/rbf/HIPR2/hough.htm
http://www.cs.iastate.edu/~baojie/acad/past/imageprocessing/hough.htm