Question

A process that accentuate the contribution to enhancement made by high-frequency components, by multiplying the highpass filter by a constant and adding an offset to the highpass filter to prevent eliminating zero frequency term by filter is known as _______

(a) Unsharp masking

(b) High-boost filtering

(c) High frequency emphasis

(d) None of the mentioned

I got this question in an interview.

Question is taken from Unsharp Masking, High-boost filtering and Emphasis Filtering topic in division Intensity Transformations and Spatial Filtering of Digital Image Processing

Answer 1

The correct choice is (c) High frequency emphasis

Explanation: High frequency emphasis is the method that accentuate the contribution to enhancement made by high-frequency component. In this we multiply the highpass filter by a constant and add an offset to the highpass filter to prevent eliminating zero frequency term by filter.