How to crop multiple images?

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

Answer 1

[Walter Roberson]

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.

[Mohammad Shakhawat Sumon]

its not working. can you help me to operate this code.

>> fff

Error using imread>get_format_info (line 543)

Unable to determine the file format.

Error in imread (line 391)

fmt_s = get_format_info(fullname);

Error in fff (line 8)

theImage = imread(ssss);

and i am use this code

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

ssss = 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

[Walter Roberson]

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]

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]

Change

dinfo = dir(imageDir);

to

dinfo = dir( fullfile(imageDir, '*.jpg') );

Change

  theImage = imread('00027 22.jpg');

to

  theImage = imread(sssss);

[Mohammad Shakhawat Sumon]

Thanks a lot.

Its working well.

[dinesh bharathi]

I want to do the same with Interlacing parameter with value set to 'Adam7'. How do I do it?

[Image Analyst]

@dinesh bharathi, did you post in the right place? This post involves reading in a sequence of images. What is "interlacing parameter"? No one in this thread mentions "interlacing parameter".

If you have any more questions, then attach your data and code to read it in with the paperclip icon after you read this:

TUTORIAL: How to ask a question (on Answers) and get a fast answer

[dinesh bharathi]

@Image Analyst I just figured it out. I wanted to process images in batch and save them under Adam 7 interlaced format. I worked out imwrite(croppedImage, fullFileName,'png','InterlaceType','adam7'); in R2020b it was giving me weird response bby writing files differently. But when i tried the same imwrite(croppedImage, fullFileName,"png","InterlaceType","adam7"); in R2022a I was getting what i desired. Now it works fine.