Compare each image with another

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Abhishek Singh
Abhishek Singh 2019-7-2
评论： Anu 2022-1-16
As suggested by @Image Analyst to read images from the system to workspace I am using his code he answered on a different question.
folder = 'D:\My Pictures\whatever'
filePattern = fullfile(folder, '*.jpg');
f=dir(filePattern)
files={f.name}
for k=1:numel(files)
fullFileName = fullfile(folder, files{k})
cellArrayOfImages{k}=imread(fullFileName)
end
Now I want to compare each image in my workspace to other image using the score ssim(). I have to categorize those images into 4 groups dependent on the score (0.7,0.9) using ifelse and also then save them into different folders in my system which would be great. Please let me know how can I do this which would also not slow the system as I have lots of images. Thanks in advance.
  2 个评论
KALYAN ACHARJYA
KALYAN ACHARJYA 2019-7-2
@Abhishake Suppose you have called the image1,
Now, you have to find SSIM in between image1 and ??? Please clarify?
group1={};group2={}...... %Preallocation
n=1,m=1.....
if SSIM_value==0.7
group1{n}=current_image
n=n+1;
elseif
...
So on....
Abhishek Singh
Abhishek Singh 2019-7-2
Yes, I have to find ssim() between all the images.

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采纳的回答

Image Analyst
Image Analyst 2019-7-2
I suggest you don't store all the images in a cell array because you might run out of memory if you have a lot of them. I'd just use a double for loop:
numImages = numel(files);
allSsim = ones(numImages, numImages);
for k = 1 : numImages - 1
fullFileName1 = fullfile(folder, files{k});
image1 = imread(fullFileName1);
for k2 = k + 1 : numImages
fullFileName2 = fullfile(folder, files{k2});
image2 = imread(fullFileName2);
allSsim(k, k2) = ssim(image1, image2) % Compute ssim
allSsim(k2, k) = allSsim(k, k2); % Make symmetric.
end
end
  12 个评论
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Image Analyst
Image Analyst 2019-7-14
I'm attaching a kmeans demo for grayscale and color. Adapt as needed. Good luck. ?️
Abhishek Singh
Abhishek Singh 2019-7-14
Thanks a lot for your tremendous help and effort. So far your previous algorithm is also working with only small erroneous result I mentioned just an hour ago. Do you know why that should happen? I will look at the mat files you have attached. Thank you once again.

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更多回答（1 个）

Anu
Anu 2022-1-16
Thanks, @Image Analyst, The code is really helpful.
folder = 'C:\Users\anusu\Downloads\figures\New folder';
filePattern = fullfile(folder, '*.tif');
f=dir(filePattern);
files={f.name};
numImages = numel(files);
allSsim = ones(numImages, numImages);
for k = 1 : numImages - 1
fullFileName1 = fullfile(folder, files{k});
image1 = imread(fullFileName1);
for k2 = k + 1 : numImages
fullFileName2 = fullfile(folder, files{k2});
image2 = imread(fullFileName2);
[ssimval,ssimmap] = ssim(image1,image2);
figure();
imshow(ssimmap,[])
title('Local SSIM Map with Global SSIM Value:'+num2str(ssimval))
subtitle(sprintf('%d',k, k2))
fileC = fullfile(folder, sprintf('SSIM%d.png', k, k2));
saveas(gcf, fileC);
allSsim(k, k2) = ssim(image1, image2); % Compute ssim
allSsim(k2, k) = allSsim(k, k2); % Make symmetric.
end
end
The above code works perfectly except the subtitle. May I know how to print the k, k2 values in a figure title so that I understand which images are compared to draw the map? Any suggestion/help would be appreciated. Thanks.
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Image Analyst
Image Analyst 2022-1-16
@Anu so simply get rid of the backslash n
folder = 'C:\Users\anusu\Downloads\figures\New folder';
filePattern = fullfile(folder, '*.tif');
f=dir(filePattern);
files={f.name};
numImages = numel(files);
allSsim = ones(numImages, numImages);
for k = 1 : numImages - 1
fullFileName1 = fullfile(folder, files{k});
image1 = imread(fullFileName1);
for k2 = k + 1 : numImages
fullFileName2 = fullfile(folder, files{k2});
image2 = imread(fullFileName2);
[ssimval,ssimmap] = ssim(image1,image2);
figure();
imshow(im2double(ssimmap),[])
impixelinfo;
caption = sprintf('Local SSIM Map with Global SSIM Value: %.4f for k = %d, k2 = %d', ssimval, k, k2);
title(caption)
fileC = fullfile(folder, sprintf('SSIM%d.png', k, k2));
saveas(gcf, fileC);
allSsim(k, k2) = ssim(image1, image2); % Compute ssim
allSsim(k2, k) = allSsim(k, k2); % Make symmetric.
end
end
Anu
Anu 2022-1-16
@Image Analyst Ohh I tried this before but without removing \n, and it didn't work. Now it makes sense and thanks so much!

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