How to crop 4 different images from a single image?

I have a form with 4 image fields, stacked together horizontally, I want to crop these 4 images automatically, and want to save these 4 images individually with 4 different file names. How could I perform it using Matlab. Can you help me with some code for it?

Answer 1

[Image Analyst]

[rows, columns, numberOfColorChannels] = size(theImage);
col4 = round(columns/4, columns/2, 3*columns/4);
if numberOfColorChannels == 1
  % Gray scale image.
  image1 = theImage(:, 1:col4(1));
  image2 = theImage(:, col4(1)+1:col4(2));
  image3 = theImage(:, col4(2)+1:col4(3));
  image4 = theImage(:, col4(3)+1:end);
else
  % Color image.
  image1 = theImage(:, 1:col4(1), :);
  image2 = theImage(:, col4(1)+1:col4(2), :);
  image3 = theImage(:, col4(2)+1:col4(3), :);
  image4 = theImage(:, col4(3)+1:end, :);
end

Then use imwrite to save each quadrant.

[Image Analyst]

OK, with that image, you need to threshold it

binaryImage = grayImage < 128;

and then skeltonize the image with bwmorph,

binaryImage = bwmorph(binaryImage, 'skel', inf);

extract a line half way down and find the middle line and use find() to figure out where the vertical lines are.

lineLocations = find(binaryImage(rows/2,:));

Then use those columns to extract the images like I did above. Let me know if you still can't figure it out.

[Prashant]

Thanks...