函数实现了图像中单象素宽白色相交直线交点的检测.利用的是最简单的邻域中计算白点的个数的算法，当一个象素的window邻域中有四个邻域为白色的时候，该点即为交点。-Function to achieve a single-pixel wide image of white intersection point of intersection of a straight line detection. Use is the simplest o-domain calculation of the n