Read, Crop and then Save multiple images

I am really new to Matlab, but I need for a project to crop multiple images with the same rectangle and then save them into a new folder.

(I have 172 images in the folder, first one is called frame10.jpg, last one is frame182.jpg)

Here's my code so far:

for n=10:182

      image_{n}=imread(sprintf('frame%s.jpg', num2str(n)));

end

[x rect] = imcrop(image_{10})

for n=11:182

      imcrop(image_{n}, rect)

end

When I Run it, it opens up all the figures of the images correctly cropped.

My questions are: how can I tell matlab not to open up all the figures of the cropped images since I do not need to see them?

How do I save all the cropped images in a new folder 'Cropped' inside the current folder? (possibly using imwrite but it's not necessary)

Answer 1

[KSSV]

images = dir('*.jpg') ;  % GEt all images of the folder 
N = length(images) ;     % number o fimages 
I = imread(images(1).name) ;  % crop one to get rect 
[x, rect] = imcrop(I) ;

for i = 1:N
    I = imread(images(i).name) ;   % REad image 
    I = imcrop(I,rect) ;           % crop image 
    [filepath,name,ext] = fileparts(images(i).name) ;
    imwrite(I,strcat(name,'cropped',ext)) ;   % Save image 
end

[Marco Beccarini]

Thank you!! It worked perfectly! I just had to change "fileparts(files(i).name)" with "fileparts(images(i).name)" to make it work.

[KSSV]

Ohhhh...yes...typo error...

[Sudheer Nagalapalli]

i am not gettde is code right can u help me dir('*.jpg') in place of * what we have to write and when i am run that code i am getting this error Index exceeds matrix dimensions.

Error in facecrop3 (line 3) I = imread(images(1).name) ; % crop one to get rect

[hana razak]

Hi there,

Thanks for your answer. I had the same problem and this code also worked perfectly well for me.

If I may ask the experts here, is there any way to replace the original images instead of saving the new images in 'cropped.jpg'?

Thank you

[KSSV]

Use tis line at imwrite:

 imwrite(I,strcat(name,ext)) ;   % Save image

[Image Analyst]

Instead of this:

[filepath,name,ext] = fileparts(images(i).name) ;
imwrite(I,strcat(name,'cropped',ext)) ;   % Save image

try this:

fullFileName = fullfile(images(i).folder, images(i).name);
imwrite(I,fullFileName) ;   % Save image

Also I'd avoid using i (the imaginary number) as a variable name, and avoid using I because upper case "i" looks too much like 1 (one) and l (lower case L).

[hana razak]

Thank you very much dear experts. Your answers really made my day :)

[nisa sarfraz]

I = imread(images(1).name) ; % crop one to get rect

this line gives error of index matrix dimension exceeds. please suggest some solution.

Answer 2

[Ismail Nasri]

</matlabcentral/answers/uploaded_files/270469/Captureblm.PNG> Hiw can i use this script for detecting crop and saving multiples images

[Mustafa Yildiz]

Hello did you find any way for do that ?