Image size reduction by averaging pixels into one

Hello, I want to reduce the size of an image by averaging every 4 neighbouring pixels into 1 pixel of the output image. This should help me to get an N/2 x N/2 image from an N x N image.

I was using a kernal = ones(2) and conv2(). But I was not able to get the dientions to half of the original image. Can you please help?

Thank you.

Answer 1

[Ameer Hamza]

There can be several ways to do this in MATLAB. Check my answer here: https://www.mathworks.com/matlabcentral/answers/543872-compress-down-a-1000x1000-matrix-into-a-100x100-matrix. Apart from those methods, imresize() will also work

im_resized = imresize(img, 1/2)

[matlab quest]

Thanks! That worked well.