中文说明：
基于matlab开发环境，编写了边缘检测的图形识别小程序。用于圆形标点。要求标点为白底黑圆。适合初学者理解图形识别的原理。
English Description：
Based on MATLAB development environment, a small program of edge detection and graphic recognition is written. Used for circular punctuation. Punctuation is required to be black circle on white background. Suitable for beginners to understand the principle of graphic recognition