matlab中的霍夫变换检测圆，利用其检测直线的原理，来检测圆形，非常有效。-matlab principle of Hough transform circle detection, using its line detection to detect round, very effective.

MATLAB 调用IGES文件的工具箱 利用工具箱函数 可直接对IGES文件进行处理 (MATLAB toolbox called IGES file using toolbox functions can be processed directly on the IGES file)