MATLAB: Compare images in one folder with a single image

compareImage Processing Toolbox

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!

Best Answer

Try this code, parts of which I pulled from the FAQ:
% 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.
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