中文说明：matlab练习程序（二维直方图） 普通的直方图就是统计图像中像素灰度出现的次数。二维直方图的其中一维就是普通的直方图，即统计图像中像素灰度出现的次数。另一维的概念就比较模糊了，我看很多论文中都是用的当前像素邻域均值灰度出现的次数。按照这个意思，其实用当前像素邻域中值灰度出现的次数也是可以的。或者用什么厉害的算法处理一下，在统计出现灰度的次数也是可以的。所以按照这样推广，其实构成N维直方图也是未尝不可的。
English Description：
MATLAB training programs (two dimensional histogram) ordinary histogram statistics pixel intensity in an image show up frequently. One dimension of two-dimensional histogram is a normal histogram, namely statistics pixel intensity in an image of occurrences. Another dimension of the concept is vague, and I read a lot of papers are used for neighborhood mean gray of occurrences of the current pixel. By this means, in fact, with the current pixel values in a neighborhood gray level of occurrences is also possible. Or use what powerful algorithms, number appear in the statistics of gray is also possible. So according to this promotion, in fact constitutes a n-dimensional histogram is also acceptable.