Question

The transfer function of High frequency emphasis is given as: Hhfe(u, v) = a + b Hhp(u, v), for Hhp(u, v) being the highpass filtered version of image,a≥0 and b>a. What happens when b increases past 1?

(a) The high frequency are emphasized

(b) The low frequency are emphasized

(c) All frequency are emphasized

(d) None of the mentioned

This question was posed to me in an internship interview.

I need to ask this question from Unsharp Masking, High-boost filtering and Emphasis Filtering in chapter Intensity Transformations and Spatial Filtering of Digital Image Processing

Answer 1

Correct answer is (a) The high frequency are emphasized

Easiest explanation: The transfer function of High frequency emphasis is given as: Hhfe(u, v) = a + b Hhp(u, v), for Hhp(u, v) being the highpass filtered version of image,a≥0 and b>a. When b increases past 1, the high frequency are emphasized.