matlab计算PSNR
时间: 2023-08-23 22:07:34 浏览: 156
在Matlab中计算PSNR(峰值信噪比)的代码可以有多种实现方式。其中一种常见的实现方式如下:
```matlab
function \[PSNR, MSE\] = psnr(X, Y)
if size(X,3)~=1 % 判断图像是否为彩色图像
org = rgb2ycbcr(X); % 将RGB图像转换为YCbCr格式
test = rgb2ycbcr(Y);
Y1 = org(:,:,1); % 只计算Y分量(亮度分量)
Y2 = test(:,:,1);
Y1 = double(Y1); % 转换为double类型
Y2 = double(Y2);
else % 灰度图像,不需要转换
Y1 = double(X);
Y2 = double(Y);
end
if nargin < 2
D = Y1;
else
if any(size(Y1)~=size(Y2))
error('The input size is not equal to each other!');
end
D = Y1 - Y2;
end
MSE = sum(D(:).*D(:)) / numel(Y1); % 计算均方差MSE
PSNR = 10*log10(255^2 / MSE); % 计算峰值信噪比PSNR
end
```
这段代码可以计算彩色图像和灰度图像的PSNR值。对于彩色图像,首先将RGB图像转换为YCbCr格式,然后只计算Y分量(亮度分量)的PSNR值。对于灰度图像,直接计算PSNR值即可。请注意,这段代码中的PSNR计算公式是基于灰度级为255的情况下计算的。
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