图像相似度检测，下面是直方图相交的代码，同种图片的识别率达90％以上，性能非常稳定。

程序的例子是8位（256色）位图，其他位图类似。

-Image similarity detection, the following is the histogram intersection of the code, the same kinds of picture identification rate of 90, performance is very stable. Procedures for example is 8-bit (256 colors) bitmap, and other similar bitmap.