convolution of multiple images with multiple filters

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MA on 25 Oct 2021
Commented: Image Analyst on 25 Oct 2021
Let's assume I have a set of images in one variable X, where the size of this variable is 4D [width, height, channels, number of images]. Now, I want to do a convolution with a set of filters that are all in one variable F of size 4D [filter width, filter height, channels, number of filters]. Is there any function in Matlab that could do that or any thing similar to this idea?

Accepted Answer

Image Analyst
Image Analyst on 25 Oct 2021
I'd just do a for loop over the 4th dimension
for k = 1 : size(X, 4)
thisFilter = F(:, :, :, k);
thisX = X(:, :, :, k);
filteredImage = convn(thisX, thisFilter, 'same');
For readability and maintainability, I really recommend you use more descriptive variable names. No one lilkes to read code that looks like alphabet soup.
Image Analyst
Image Analyst on 25 Oct 2021
How would that work? Let's say you have 20 images and 100 filters? How many filtered output images do you want? If it's 20x100 = 2000 then just have two for loops. Don't worry about for loops being slow, especially for only 2000 iterations. You computer can do 200 iterations in microseconds. It's the filtering itself that will take most of the time, not the iterations.

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