用matlab检测直线，圆。椭圆的程序，对直线程序进行了改进，采用随机霍夫变换 ＆由粗到细的检测方式检测，效果好-detection using Matlab straight round. Elliptic procedures, the procedures for linear improvement, randomized Hough Transform & by coarse-to-fine detection methods for detection, effectiv