霍夫变换，圆检测，硬币检测，图片中硬币价格识别，K-mean，高斯滤波,边缘检测，gradient，包括硬币实例图片。自己写的函数，不用toolbox。-hough transform, circle detect, coin detect, coin prize calculate, edge detect, gradient, K-mean, self-define function, no toolbox library.