用matlab实现一种MSRCR图像增强算法,
时间: 2023-07-12 17:07:01 浏览: 56
MSRCR(Multi-Scale Retinex with Color Restoration)是一种图像增强算法,它在不同的尺度上对图像进行Retinex分解,并且通过颜色恢复来得到最终的增强图像。
以下是用MATLAB实现MSRCR算法的步骤:
1. 加载图像并将其转换为YCbCr颜色空间。
```matlab
img = imread('image.jpg');
img_ycbcr = rgb2ycbcr(img);
```
2. 对亮度分量(Y通道)进行多尺度Retinex分解。
```matlab
Y = double(img_ycbcr(:,:,1))/255;
sigma_list = [15,80,250];
G = fspecial('gaussian',[15 15],7);
Y_log = log(Y+1);
for i = 1:length(sigma_list)
sigma = sigma_list(i);
Gi = imfilter(Y,G*sigma,'replicate');
Li = log(Y+1) - log(Gi+1);
M(:,:,i) = imfilter(Li,G*sigma,'replicate');
end
```
3. 计算MSRCR权重。
```matlab
epsilon = 0.01;
W = zeros(size(Y));
for i = 1:length(sigma_list)
Wi = exp(-abs(M(:,:,i)-log(Y+1))/((sigma_list(i)^2)/epsilon));
W = W + Wi;
end
```
4. 对MSRCR权重进行归一化处理。
```matlab
W = W/length(sigma_list);
```
5. 进行颜色恢复。
```matlab
Cb = imresize(img_ycbcr(:,:,2),size(Y));
Cr = imresize(img_ycbcr(:,:,3),size(Y));
R = Y.^(1-W).*Cb.^W.*Cr.^W;
```
6. 将增强后的图像转换回RGB颜色空间。
```matlab
R = R.*255;
img_msrcr = cat(3,R,Cb,Cr);
img_msrcr = ycbcr2rgb(uint8(img_msrcr));
```
完整代码:
```matlab
img = imread('image.jpg');
img_ycbcr = rgb2ycbcr(img);
Y = double(img_ycbcr(:,:,1))/255;
sigma_list = [15,80,250];
G = fspecial('gaussian',[15 15],7);
Y_log = log(Y+1);
for i = 1:length(sigma_list)
sigma = sigma_list(i);
Gi = imfilter(Y,G*sigma,'replicate');
Li = log(Y+1) - log(Gi+1);
M(:,:,i) = imfilter(Li,G*sigma,'replicate');
end
epsilon = 0.01;
W = zeros(size(Y));
for i = 1:length(sigma_list)
Wi = exp(-abs(M(:,:,i)-log(Y+1))/((sigma_list(i)^2)/epsilon));
W = W + Wi;
end
W = W/length(sigma_list);
Cb = imresize(img_ycbcr(:,:,2),size(Y));
Cr = imresize(img_ycbcr(:,:,3),size(Y));
R = Y.^(1-W).*Cb.^W.*Cr.^W;
R = R.*255;
img_msrcr = cat(3,R,Cb,Cr);
img_msrcr = ycbcr2rgb(uint8(img_msrcr));
imshow(img_msrcr);
```
注意:在实现过程中,可能需要根据图像的特点调整参数,如sigma_list、epsilon等。