Question

Using gray-level transformation, the basic function power-law 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

The question was posed to me in unit test.

My question is taken from Basic Grey Level Transformation topic in chapter Image Enhancement of Digital Image Processing

Answer 1

Right answer is (b) negative and identity transformations

For explanation I would say: 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.