How can I divide a image of 1500*1500 into different blocks of 32*32 and save all the images in a folder with different subfolders in it.

I have a folder in which i have sub folders of different image groups. Each image is 1500*1500, How can I divide it into different blocks of 32*32 and save all the images in that folder with different subfolders in it.

[Walter Roberson]

1500 = 46*32 + 28 -- that is, you would have partial blocks of 28 at the end. What do you want to do with those blocks?

[NEHA SINGH]

hello Sir, I want a total of 2116 blocks of 32*32. I am attaching my code where I want input image size of 32 *32 for classification. I have different subfolders of different granite tile images of 1500*1500. I want 2116 blocks of each images and save in a different folder.

Answer 1

[Walter Roberson]

%divide into blocks
temp = cell2mat(YourImage, [32 * ones(1, 46), 28], [32 * ones(1, 46), 28]);
separate_blocks = temp(1:end-1, 1:end-1);

%create output folder, making sure we do not overwrite any existing folder
while true
  foldername = tempdir('.');
  if ~exist(foldername, 'dir'); break; end
end
mkdir(foldername);

%write the images
for K = 1 : numel(separate_blocks)
   filename = fullfile(foldername, sprintf('%04d.bmp', K));
   imwrite(filename, separate_blocks{K});
end

http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F