图像灰度处理、二值化、边缘检测、有效区域查找和边界拟合的方法，是图像处理典型方法介绍。-this is picture lapalace & find validate area

四种常见的基于matlab的图像边缘检测技术程序。希望彼此能够沟通一下。-Four common image-based edge detection matlab technical procedures. I hope you able to communicate with each other.