Matlab简单计算水下图像质量指标UIQM的代码
时间: 2023-07-16 12:12:39 浏览: 113
UIQM(Underwater Image Quality Measure)是一种用于评估水下图像质量的指标,可以用MATLAB进行计算。下面是一个简单的MATLAB代码示例:
```
% 读取水下图像
I = imread('underwater_image.jpg');
% 计算UIQM
uiqm = compute_uiqm(I);
% 显示结果
disp(['UIQM值为:', num2str(uiqm)]);
function u = compute_uiqm(I)
% 计算UIQM
% I: 输入的水下图像
% 从图像中提取颜色分量
R = double(I(:,:,1));
G = double(I(:,:,2));
B = double(I(:,:,3));
% 计算图像的均值和标准差
meanR = mean(R(:));
stdR = std(R(:));
meanG = mean(G(:));
stdG = std(G(:));
meanB = mean(B(:));
stdB = std(B(:));
% 计算对比度
C1 = sqrt(stdR^2 + stdG^2 + stdB^2);
C2 = sqrt(meanR^2 + meanG^2 + meanB^2);
% 计算饱和度
S = std(R(:))/(mean(R(:)) + eps) + std(G(:))/(mean(G(:)) + eps) + std(B(:))/(mean(B(:)) + eps);
% 计算清晰度
G = fspecial('gaussian', [7 7], 1.5);
Rg = imfilter(R, G, 'symmetric');
Gg = imfilter(G, G, 'symmetric');
Rgg = imfilter(Rg, G, 'symmetric');
Rx = R - Rgg;
Rxx = imfilter(Rx.^2, G, 'symmetric');
Q = sqrt(Rxx./Gg);
% 计算UIQM值
u = C1*C2*S*mean(Q(:));
end
```
上述代码中,我们首先读入水下图像,然后通过 `compute_uiqm` 函数计算UIQM值。其中,我们首先从图像中提取RGB颜色分量,然后计算每个通道的均值和标准差,接着计算对比度、饱和度和清晰度,并最终将它们相乘得到UIQM值。