How to retrieve specific pixels from an image based on the label

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Patrice Gaofei 2021-1-1

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https://ww2.mathworks.cn/matlabcentral/answers/706348-how-to-retrieve-specific-pixels-from-an-image-based-on-the-label

评论： Patrice Gaofei 2021-1-3

采纳的回答： Image Analyst

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Hello everyone,

I am conducting some works on image restoration, particularly on specular reflection removal. I have obtained some results and I would like to evaluate the performance of my method using some quantitative metrics suh PSNR, SSIM, COV, etc. However, I would like to compute these metrics only for the regions that have restored. Please, how can I retrieve only the pixels of the restored regions from the processed images? This is the code I wrote for computing the evaluation metrics for the entire image.

allPSNR = zeros(1, numImages);
allSSIM = zeros(1, numImages);
for k = 1 : numImages
	baseFileName = theFiles(k).name;
	fullFileName = fullfile(theFiles(k).folder, baseFileName);
    
    baseFileName1 = theFiles1(k).name;
	fullFileName1 = fullfile(theFiles1(k).folder, baseFileName1);
	lab = imread(fullFileName);
    img = imread(fullFileName1);
    
    allPSNR(k) = psnr(img, lab);
    allSSIM(k) = ssim(img, lab);   
end
    
meanPSNR = mean(allPSNR);
meanSSIM = mean(allSSIM);

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Patrice Gaofei 2021-1-1

Thank you for your comments. Yes, I do have the binary image that will help map out the regions. That is what I call label.

Patrice Gaofei 2021-1-1

Please Mr./Mrs. Image Analyst, any hep?

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采纳的回答

Image Analyst 2021-1-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/706348-how-to-retrieve-specific-pixels-from-an-image-based-on-the-label#answer_588943

在 MATLAB Online 中打开

See if it will work for one-dimensional vectors:

    allPSNR(k) = psnr(img(binaryImage), lab(binaryImage));
    allSSIM(k) = ssim(img(binaryImage), lab(binaryImage));   

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Image Analyst 2021-1-2

Of course pixel values at different locations can be equal. What if you had a completely uniform image where every single pixel in the entire image had the same gray scale value or RGB color? Maybe I'm not understanding what you're trying to say.

Patrice Gaofei 2021-1-3