psnr和ssim源代码（c++版）

结合网络上的资料和自己的修改，实现了psnr和ssim的c++版本。

#include<iostream>
#include<opencv2\opencv.hpp>
#include <math.h> 
#include <stdio.h> 
#include <cv.h>	
#include <highgui.h>
using std::cout;
using std::endl;
int ssim(char *ref_image, char *obj_image)
{
	// default settings
	double C1 = 6.5025, C2 = 58.5225;

	IplImage
		*img1 = NULL, *img2 = NULL, *img1_img2 = NULL,
		*img1_temp = NULL, *img2_temp = NULL,
		*img1_sq = NULL, *img2_sq = NULL,
		*mu1 = NULL, *mu2 = NULL,
		*mu1_sq = NULL, *mu2_sq = NULL, *mu1_mu2 = NULL,
		*sigma1_sq = NULL, *sigma2_sq = NULL, *sigma12 = NULL,
		*ssim_map = NULL, *temp1 = NULL, *temp2 = NULL, *temp3 = NULL;


	/***************************** INITS **********************************/
	img1_temp = cvLoadImage(ref_image);
	img2_temp = cvLoadImage(obj_image);

	if (img1_temp == NULL || img2_temp == NULL)
		return -1;

	int x = img1_temp->width, y = img1_temp-&