opencv计算ssim的c++代码
时间: 2023-07-24 14:18:52 浏览: 67
以下是使用OpenCV计算SSIM的C++代码示例:
```c++
#include <opencv2/opencv.hpp>
#include <iostream>
double getMSSIM(const cv::Mat& i1, const cv::Mat& i2)
{
const double C1 = 6.5025, C2 = 58.5225;
/***************************** INITS **********************************/
int d = CV_32F;
cv::Mat I1, I2;
i1.convertTo(I1, d); // cannot calculate on one byte large values
i2.convertTo(I2, d);
cv::Mat I2_2 = I2.mul(I2); // I2^2
cv::Mat I1_2 = I1.mul(I1); // I1^2
cv::Mat I1_I2 = I1.mul(I2); // I1 * I2
/***********************PRELIMINARY COMPUTING ******************************/
cv::Mat mu1, mu2; //
cv::GaussianBlur(I1, mu1, cv::Size(11, 11), 1.5);
cv::GaussianBlur(I2, mu2, cv::Size(11, 11), 1.5);
cv::Mat mu1_2 = mu1.mul(mu1);
cv::Mat mu2_2 = mu2.mul(mu2);
cv::Mat mu1_mu2 = mu1.mul(mu2);
cv::Mat sigma1_2, sigma2_2, sigma12;
cv::GaussianBlur(I1_2, sigma1_2, cv::Size(11, 11), 1.5);
sigma1_2 -= mu1_2;
cv::GaussianBlur(I2_2, sigma2_2, cv::Size(11, 11), 1.5);
sigma2_2 -= mu2_2;
cv::GaussianBlur(I1_I2, sigma12, cv::Size(11, 11), 1.5);
sigma12 -= mu1_mu2;
///////////////////////////////// FORMULA ////////////////////////////////
cv::Mat t1, t2, t3;
t1 = 2 * mu1_mu2 + C1;
t2 = 2 * sigma12 + C2;
t3 = t1.mul(t2); // t3 = ((2*mu1_mu2 + C1).*(2*sigma12 + C2))
t1 = mu1_2 + mu2_2 + C1;
t2 = sigma1_2 + sigma2_2 + C2;
t1 = t1.mul(t2); // t1 =((mu1_2 + mu2_2 + C1).*(sigma1_2 + sigma2_2 + C2))
cv::Mat ssim_map;
cv::divide(t3, t1, ssim_map); // ssim_map = t3./t1;
cv::Scalar mssim = cv::mean(ssim_map); // mssim = average of ssim map
return mssim[0];
}
int main(int argc, char** argv)
{
if (argc != 3)
{
std::cout << "usage: " << argv[0] << " <input_image1> <input_image2>" << std::endl;
return -1;
}
cv::Mat img1 = cv::imread(argv[1], cv::IMREAD_GRAYSCALE);
cv::Mat img2 = cv::imread(argv[2], cv::IMREAD_GRAYSCALE);
double ssim = getMSSIM(img1, img2);
std::cout << "SSIM: " << ssim << std::endl;
return 0;
}
```
在这个示例中,我们使用了OpenCV中的函数 `cv::GaussianBlur()` 来计算图像的均值和方差。函数 `cv::mean()` 用于计算SSIM映射的平均值。
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