Question

Logic operations between two or more images are performed on pixel-by-pixel basis, except for one that is performed on a single image. Which one is that?

(a) AND

(b) OR

(c) NOT

(d) None of the mentioned

I had been asked this question in a national level competition.

This key question is from Enhancement using Logic Operations topic in section Image Enhancement of Digital Image Processing

Answer 1

Right choice is (c) NOT

To elaborate: Although all the Arithmetic/Logic operations between two or more images are performed on pixel-by-pixel basis, except for NOT that is performed on a single image.