Resizing an image in matlab without introducing interpolated values

Question

I have a categorical image and I need to make it smaller. But, by default, when I use imresize in matlab, the output is not categorical either (it will be continuous). However, there are some methods like Otsu to convert it to categorical image, but I do not want to use those methods.

Is there any method in matlab by which I will be able to resize a categorical image to another categorical image without using any other operation on the resized image?

Answer 1

If you use nearest neighbor interpolation, it should only use values that were in the image before, ie, no weighted averages.

As from the docs , to achieve this, you should add 'nearest' to the function call to specify the nearest neighbor interpolation method. Default is bicubic interpolation.