Question

I would like to add a cell array of images together using imadd, but imadd only takes two arguments. Is there a reduce function in MATLAB which I could use add all of these images together without writing a for loop?

images = {im1, im2, im3};
sum = reduce(@imadd, images);

Answer 1

You could just use an array with an extra dimension. E.g. for 2-d (grayscale images)

images = {im1, im2, im3};
imarr = cat(3, images{:});
imsum = sum(imarr, 3);

Of course there’s no need to create the cell array in the first place; you could go straight to

imarr = cat(3, im1, im2, im3);
imsum = sum(imarr, 3);

or even

imsum = sum(cat(ndims(im1)+1, im1, im2, im3),ndims(im1)+1);

which also more generally combines any dimensional matrices.