MATLAB: How to combine two images of different sizes

digital image processingMATLAB

I have a small picture image that I want combine with a larger one,just like sticking them together. Re-sizing and adding them didn't work because the smaller one gets stretched too much when I re-sized it to size of the larger one,and the opposite when I tried re-sizing the larger one to the size of the smaller one. Can anyone help?

Best Answer

You want the two images to be adjacent to each other in their different sizes? Or you want them to be adjacent but the same size as each other? Or you want to mix together the images like by transparency? Or you want to replace part of the first image by the second image?

If you want the two images to be adjacent to each other in their different sizes, then pad the edge of the first matrix with a band of as many zeros as matches the size of the second image, and then store the second image into the appropriate place in those zeros. Though you might have to use some value other than 0 (e.g., you might want the empty space to be white.)

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MATLAB: How to merge two images of different sizes ?

You can just index elements in bigger image and assign them values of smaller image.

combinedImage = biggerImage;
s = size(smallerImage);
combinedImage(x:x+s(1)-1, y:y+s(2)-1, :) = smallerImage;

This example works only if smaller image fits entirely into bigger image after placed to specific location!

If you want be able to put smaller image to location that part of it will be outside of bigger image, you have to handle this case properly. There are more options you can do. You can extend bigger image (and set some background color) or crop smaller image.

Whole example code:

 % 'specific location' point
 x = 123;
 y = 274;
 % create example images
 biggerImage = rand(512,512,3);
 smallerImage = ones(64,64,3);
 % merge images
 combinedImage = biggerImage;
 s = size(smallerImage);
 combinedImage(x:x+s(1)-1, y:y+s(2)-1, :) = smallerImage;
 imshow(combinedImage);

Result:

MATLAB: Combining 2 images of different size

CompositeImage = BiggerImage;
CompositeImage(FirstRow : FirstRow + size(SmallerImage,1) - 1, FirstColumn : FirstColumn + size(SmallerImage,2) - 1) = SmallerImage;

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MATLAB: How to merge two images of different sizes ?

MATLAB: Combining 2 images of different size

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