在二值图像中，相互联结的黑像素的集合成为一个(黑)区域。本程序通过对图像内每个区域进行标记操作，求得区域的数目。

采用8连通判别算法。

从左到右，从上到下，依次检测每个像素，如果发现某像素点像素值为0，则依次检测该点的右上、正上、左上及左前点共四个点的像素值，判断他们的连通性。-value of the two images, mutual association of black pixels set to become a (black) region. The procedures of images within each region marking operation, the number of regional obtained. 8 connectivity using discriminant algorithm. From left to right, top to bottom, following detection of each pixel, pixels if it is found that a certain point pixel value is 0, then followed the detection point of difference is, the upper left point and left a total of four points pixel value judgment of their connectivity.