Question

What causes the effect, imperceptible set of very fine ridge like structures in areas of smooth gray levels?

(a) Caused by the use of an insufficient number of gray levels in smooth areas of a digital image

(b) Caused by the use of huge number of gray levels in smooth areas of a digital image

(c) All of the mentioned

(d) None of the mentioned

I got this question in a job interview.

I would like to ask this question from Spatial and Gray-Level Resolution and Aliasing topic in chapter Image Enhancement of Digital Image Processing

Answer 1

Correct option is (a) Caused by the use of an insufficient number of gray levels in smooth areas of a digital image

For explanation I would say: The set of very fine ridge like structures in area of smooth gray levels generally is quite visible in images displayed using 16 or less uniformly spaced gray levels.