Question

The function of filters in Image sharpening in frequency domain is to perform reverse operation of which of the following Lowpass filter?

(a) Gaussian Lowpass filter

(b) Butterworth Lowpass filter

(c) Ideal Lowpass filter

(d) None of the Mentioned

I got this question by my school teacher while I was bunking the class.

This interesting question is from Gaussain Lowpass and Sharpening Frequency Domain Filters topic in division Filtering in Frequency Domain of Digital Image Processing

Answer 1

Correct answer is (c) Ideal Lowpass filter

Best explanation: The function of filters in Image sharpening in frequency domain is to perform precisely reverse operation of Ideal Lowpass filter.

The transfer function of Highpass filter is obtained by relation: Hhp(u, v) = 1 – Hlp(u, v), where Hlp(u, v) is transfer function of corresponding lowpass filter.