用于对检测图像中的平行直线。如果图像中有两条平行的直线，则将这两条平行直线提取出来。-Used for detection of parallel straight-line image. If the image has two parallel straight lines, they will be two parallel straight lines extracted.

数字图像处理边缘检测（hough变化-平行直线检测，轮廓跟踪、提取，种子填充算法1和2）的具体实现。-The edge detection digital image processing (hough change- parallel line detection, the concrete realization of contour tracking, extract, seed filling algorithm 1 and 2).