利用canny检测原理，对图像进行边缘检测。-ege detection by canny theory。

EGE,（Easy Graphics Engine），是windows下的简易绘图库，是一个类似BGI(graphics.h)的面向C/C++语言新手的图形库，它的目标也是为了替代TC的BGI库而存在。-EGE, (Easy Graphics Engine), is a simple graphics library under windows, is similar to BGI (graphics.h) oriented C/C++ language novice graphics libr