图像的边缘、轮廓检测。其边缘检测主要包括有Robert、Sobel、Prewitt、Gauss-Laplace等算子；以及Hough变换等常用的检测算法代码。-Image edge, contour detection. Its edge detection mainly including Robert, Sobel, Prewitt, Gauss-Laplace operator, etc. and Hough transform detection algorithm and other