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How to crop multiple images?

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Mohammad Shakhawat Sumon
Mohammad Shakhawat Sumon on 16 Sep 2019
I need some help for multiple images cropping. I used this code but it showed error and said Computer Image System Toolbox used.
In here i use this code for cropping.
imageDir = 'D:\Masters Thesis\ssss';
ssss = imageSet(imageDir);
for k = 1 : ssss.Count
theImage = imread(ssss);
croppedImage = imcrop(theImage,[646, 1291, 481, 600]);
baseFileName = sprintf('Image #%d.png', k);
fullFileName = fullfile(imageDir, baseFileName);
imwrite(croppedImage, fullFileName);
end
can anyone help me to solve this prolem.
TIA

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Answers (2)

Walter Roberson
Walter Roberson on 16 Sep 2019
Edited: Walter Roberson on 16 Sep 2019
Yes, imageSet requires the Computer Vision Toolbox.
imageDir = 'D:\Masters Thesis\ssss';
dinfo = dir(imageDir);
dinfo([dinfo.isdir]) = []; %remove folders
filenames = fullfile(imageDir, {dinfo.name});
numfiles = length(filenames);
for k = 1 : nulfiles
sss = filenames{k};
theImage = imread(ssss);
croppedImage = imcrop(theImage,[646, 1291, 481, 600]);
baseFileName = sprintf('Image #%d.png', k);
fullFileName = fullfile(imageDir, baseFileName);
imwrite(croppedImage, fullFileName);
end
Notice, though, that you are finding all files in the directory, and writing new files to the same directory. Suppose you stop part way (such as due to a bug in your code.) Then Image*.png files will have been created in the directory, and when you go to run the code again, they will be found in the directory -- and will be re-cropped and re-output, probably under a different name.
Nothing that you are doing associates a particular input file name with a particular output file name. Formally, MS Windows makes no promises about the order of files in a directory. You cannot tell, looking at an output file name, which input file it came from. You should consider changing that.

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Walter Roberson
Walter Roberson on 16 Sep 2019
You have files in the directory that are not images. It is not clear what you want the result of applying imread() to those non-images to be.
Alternatively, they might be images but matlab does not recognize the file extension . For example matlab does not recognize .orf images (Olympus cameras raw files)
Mohammad Shakhawat Sumon
Mohammad Shakhawat Sumon on 19 Sep 2019
I use this code which is given below. It works only for one picture but when i select the folder for all picture it's not working. So that i need more time for one by one picture.
Can you give me some suggestion for all images read it simultinously.
imageDir = 'D:\Masters Thesis\ssss';
dinfo = dir(imageDir);
dinfo([dinfo.isdir]) = []; %remove folders
filenames = fullfile(imageDir, {dinfo.name});
numfiles = length(filenames);
for k = 1 : numfiles
sssss = filenames{k};
theImage = imread('00027 22.jpg');
croppedImage = imcrop(theImage,[650,620, 481, 600]);
baseFileName = sprintf('Image #%d.png', k);
fullFileName = fullfile(imageDir, baseFileName);
imwrite(croppedImage, fullFileName);
end
And also i attached my folder position.
Walter Roberson
Walter Roberson on 19 Sep 2019
Change
dinfo = dir(imageDir);
to
dinfo = dir( fullfile(imageDir, '*.jpg') );
Change
theImage = imread('00027 22.jpg');
to
theImage = imread(sssss);

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Mohammad Shakhawat Sumon
Mohammad Shakhawat Sumon on 20 Sep 2019
Thanks a lot.
Its working well.

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