Question

Using gray-level transformation, the basic function Logarithmic deals with which of the following transformation?

(a) Log and inverse-log transformations

(b) Negative and identity transformations

(c) nth and nth  root transformations

(d) All of the mentioned

This question was addressed to me during an online interview.

The question is from Basic Grey Level Transformation topic in section Image Enhancement of Digital Image Processing

Answer 1

The correct choice is (a) Log and inverse-log transformations

Easiest explanation: For Image Enhancement gray-level transformation shows three basic function that are:

Linearity for negative and identity transformation

Logarithmic for log and inverse-log transformation, and

Power-law for nth and nth  root transformations.