此专栏的系列文章之四，详细讲诉了图像识别中的“霍夫变化”(Hough Transform)算法，该算法可以提取出图像中的直线、圆、矩形等图形，在图像识别中是一种较重要的算法。-column of this series of articles 4, the detail v. Image Recognition "Hough change" (Hough Transform) algorithm, the algorithm can extract images of straight-line, circle, rectangle and other graphics, image recognition is a more important algorithm.