Question

What is the name of the filter that multiplies two functions F(u, v) and H(u, v), where F has complex components too since is Fourier transformed function of f(x, y), in an order that each component of H multiplies both real and complex part of corresponding component in F?

(a) Unsharp mask filter

(b) High-boost filter

(c) Zero-phase-shift-filter

(d) None of the mentioned

The question was posed to me during an interview.

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

Answer 1

The correct choice is (c) Zero-phase-shift-filter

The explanation is: Zero-phase-shift-filter multiplies two functions F(u, v) and H(u, v), where F has complex components too since is Fourier transformed function of f(x, y), in an order that each component of H multiplies both real and complex part of corresponding component in F.