说明：  图像的二值化处理就是讲图像上的点的灰度置为0或255，也就是讲整个图像呈现出明显的黑白效果。即将2566个亮度等级的灰度图像通过适当的阀值选取而获得仍然可以反映图像整体和局部特征的二值化图像。 已通过测试。
(Binary image processing is about the point grayscale image is set to 0 or 255, that is, speaking to the entire image showing a clear black and white. Upcoming 2566 brightness levels of grayscale images, select the appropriate threshold binary image can still reflect the image of global and local features. Has been tested.)