Question

Which of the following gives an expression for high boost filtered image fhb, if f represents an image, f blurred version of f, fs  unsharp mask filtered image and A ≥ 1?

(a) fhb = (A – 1) f(x, y) + f(x, y) – f x, y)

(b) fhb = A f(x, y) – f(x,y)

(c) fhb = (A – 1) f(x, y) + fs(x, y)

(d) All of the mentioned

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

I would like to ask this question from Use of Second Order Derivative for Enhancement in division Image Enhancement of Digital Image Processing

Answer 1

The correct answer is (d) All of the mentioned

The explanation is: A high-boost filter is a generalized form of unsharp mask and is given by:

 fhb = A f(x, y) – f (x, y)

 Or, fhb = (A – 1) f(x, y) + f(x, y) – f(x, y), that can be written as

 fhb = (A – 1) f(x, y) + fs(x, y), where fs(x, y) = f(x, y) – f (x, y).