Question

Smoothing in frequency domain is achieved by attenuating which of the following component in the transform of a given image?

(a) Attenuating a range of high-frequency components

(b) Attenuating a range of low-frequency components

(c) All of the mentioned

(d) None of the mentioned

I had been asked this question by my college professor while I was bunking the class.

Question is from Smoothing Frequency-Domain Filters topic in chapter Intensity Transformations and Spatial Filtering of Digital Image Processing

Answer 1

Right answer is (a) Attenuating a range of high-frequency components

The best I can explain: Since, edges and sharp transitions contribute significantly to high-frequency contents in the gray level of an image. So, smoothing is done by attenuating a range of high-frequency components.