Question

Which of the following filtering is done in frequency domain in correspondence to lowpass filtering in spatial domain?

(a) Gaussian filtering

(b) Unsharp mask filtering

(c) High-boost filtering

(d) None of the mentioned

I had been asked this question during an internship interview.

I would like to ask this question from Filtering in Frequency Domain in division Intensity Transformations and Spatial Filtering of Digital Image Processing

Answer 1

Correct answer is (a) Gaussian filtering

The explanation is: A plot of Gaussian filter in frequency domain can be recognized similar to lowpass filter in spatial domain.