Unable to perform assignment because the indices on the left side are not compatible with the size of the right side

Hello,

I am trying to crop different parts of an image. the objects cannot be attained automatically or by coordinates so I have to crop them manually.

The code that I am using is:

im = imshow('DJI_0834.jpg');
for i = 1:30
   cropped(i)=imcrop(im)
end

It shows the image with the crop cursor but when I try to save the first crop it shows the error message in the title.

I also have a question if I can automatically save them as JPG files after finishing the crop.

Thanks.

Answer 1

[Ameer Hamza]

imcrop return an image (2D or a 3D array). You cannot assign it as an element of a numeric array. You need a cell array

im = imshow('DJI_0834.jpg');
cropped = cell(1, 30);
for i = 1:30
   cropped{i}=imcrop(im);
end

Access them using brace indexing

cropped{1}; % first cropped image
cropped{2}; % second cropped image
..
..
cropped{end}; % last cropped image

[YEMY]

Thank you, It worked for croping. I am still have one problem with saving all the data in the cell as images format. is ther a way to do so ?

[YEMY]

I mean, after getting the cropped images in a cell array, I want now to extract them as jpg files in order to use them in a further workflow

[Ameer Hamza]

Yes, you can save them using imwrite()

for i = 1:numel(cropped)
    imwrite(cropped{i}, sprintf('image%2d.png', i))
end

[YEMY]

It works, thanks.

[Ameer Hamza]

I am glad to be of help!