说明：  细化算法，对图像转化二值图像后，对高亮部分细化之几个像素，适用于道路提取，某物体骨架提取，线路提取等领域
(After the image is transformed to two value images, a few pixels of the highlighting part are applied to the extraction of road, the extraction of an object skeleton, the extraction of line and so on.)