Compare images in one folder with a single image?
3 views (last 30 days)
Show older comments
Anounymous85
on 6 Jan 2019
Commented: Image Analyst
on 15 May 2022
There is a folder with a set of sub folders. Each one of them contains several images.
Is there a way to compare first image in the first sub folder, with the first image of another folder. And so on...
Any idea? Thank you!
0 Comments
Accepted Answer
Image Analyst
on 6 Jan 2019
% Specify the folder where the reference image file lives.
refFolder = pwd; % or wherever, such as 'C:\Users\yourUserName\Documents\My Pictures';
% Check to make sure that folder actually exists. Warn user if it doesn't.
if ~isfolder(refFolder)
errorMessage = sprintf('Error: The following reference folder does not exist:\n%s', refFolder);
uiwait(warndlg(errorMessage));
return;
end
% Read in the reference image.
fullRefImageFileName = fullfile(refFolder, 'whatever.png');
if ~exist(fullRefImageFileName, 'file')
errorMessage = sprintf('Error: The following reference image does not exist:\n%s', fullRefImageFileName);
uiwait(warndlg(errorMessage));
return;
else
refImage = imread(fullRefImageFileName);
end
% Specify the folder where the test image files live.
testFolder = pwd; % or wherever, such as 'C:\Users\yourUserName\Documents\My Pictures';
% Check to make sure that folder actually exists. Warn user if it doesn't.
if ~isfolder(testFolder)
errorMessage = sprintf('Error: The following test image folder does not exist:\n%s', testFolder);
uiwait(warndlg(errorMessage));
return;
end
% Get a list of all files in the folder with the desired file name pattern.
filePattern = fullfile(testFolder, '*.PNG'); % Change to whatever pattern you need.
theFiles = dir(filePattern);
for k = 1 : length(theFiles)
baseFileName = theFiles(k).name;
fullFileName = fullfile(testFolder, baseFileName);
fprintf(1, 'Now reading %s\n', fullFileName);
% Read in test image.
testImage = imread(fullFileName);
imshow(testImage); % Display image.
drawnow; % Force display to update immediately.
% Now do whatever you want with this file name,
% such as comparing the image array with refImage in some function you write.
results = CompareImages(testImage, refImage);
end
Adapt as needed. Write back if there are any problems with it.
Remember, the CompareImages() function in there is something you have to write because we don't know how you want to compare the test images to the reference image.
9 Comments
Sneha P
on 15 May 2022
results = CompareImages(testImage, refImage);
In place of this if i use
results = isequal(testImage, refImage); --> It's reading all images in folder instead comparing testimage folder and refimage
Image Analyst
on 15 May 2022
I'm not seeing a question there, so I'll just expand on that statement.
For one call it just uses isequal on a pair of images. Of course that function gets called in a loop so eventually it will compare all images.
More Answers (0)
See Also
Categories
Find more on Image Processing Toolbox in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!