Question

The power-law transformation is given as: s = crᵞ, c and ᵞ are positive constants, and r is the gray-level of image before processing and s after processing. What happens if we increase the gamma value from 0.3 to 0.7?

(a) The contrast increases and the detail increases

(b) The contrast decreases and the detail decreases

(c) The contrast increases and the detail decreases

(d) The contrast decreases and the detail increases

The question was posed to me in an interview.

The above asked question is from Basic Grey Level Transformation topic in portion Image Enhancement of Digital Image Processing

Answer 1

Right choice is (c) The contrast increases and the detail decreases

Easy explanation: In power-law transformation as gamma decreases is increase in image details however, the contrast reduces.