opencv C++中图像直方图计算及直方图比较

１直方图计算样例如下：

vector getimhist(Mat im)
{
	vector ims;
	split(im, ims);
	const int binnum[1] = {256};
	float valuerange[2] = { 0,255 };
	const float* hrange[1] = { valuerange };
	vector imhist;
	int chnum=ims.size();
	for(int i = 0; i 

这个函数既可以计算灰度图的也可以计算彩色图．

２直方图比较如下：

Mat vectmat2mat(vector ims)
{
	Mat bigim=ims[0];
	for (int i = 1; i  imhist1=getimhist(im1);
	vector imhist2=getimhist(im2);
	Mat hist1=vectmat2mat(imhist1);
	Mat hist2=vectmat2mat(imhist2);
	float histsim = compareHist(hist1, hist2, 0);

	return histsim;
}