Question

To accentuate the contribution to enhancement made by high-frequency components, which of the following method(s) should be more appropriate to apply?

(a) Multiply the highpass filter by a constant

(b) Add an offset to the highpass filter to prevent eliminating zero frequency term by filter

(c) All of the mentioned combined and applied

(d) None of the mentioned

I have been asked this question in my homework.

This interesting question is from Unsharp Masking, High-boost filtering and Emphasis Filtering in chapter Intensity Transformations and Spatial Filtering of Digital Image Processing

Answer 1

Right choice is (c) All of the mentioned combined and applied

The best explanation: To accentuate the contribution to enhancement made by high-frequency components, we have to multiply the highpass filter by a constant and add an offset to the highpass filter to prevent eliminating zero frequency term by filter.