MATLAB: Storing Images from Cell Array into Different Files

Question

Hi,

I have already divided a picture into 100 smaller pictures and stored each image in a 10×10 cell array. I am now trying to save them to my computer as a file using imwrite.

[m,n] = size(Pgray);
Blocks = cell(m/100,n/100);
counti = 0;
for i = 1:100:m-99
   counti = counti + 1;
   countj = 0;
   for j = 1:100:n-99
        countj = countj + 1;
        Blocks{counti,countj} = Pgray(i:i+99,j:j+99);
   end
end

I think I need to create a for loop that does this for each cell, but I'm not sure how:

imwrite(Blocks{1,1}, 'Image1.jpg')

I want it to do this for every image of cell array size 10×10 so that it stores them into a folder and is labelled 'Image(1 through 100).jpg'.

Thanks in advance!

Answer 1

Here is a for loop that generates a different filename in each iteration:

for i = 1:100
    newfilename = strcat('Image', num2str(i), '.jpg')
    imwrite(img, newfilename)
end

In this example, strcat combines multiple strings into one string and num2str converts a number to string.

Make sure you are imwriting these files in the correct output directory. An easy way to do this is by putting the path to the output directory in which you want to save stuff, using the cd command, before the for loop.

cd('your_path_to_outputdirectory')