Question

An enhanced image can be obtained as: g(x,y)=f(x,y)-∇^2 f(x,y), where Laplacian is being subtracted from f(x, y) the input image. What does this conclude?

(a) That the center spike would be negative

(b) That the immediate neighbors of center spike would be positive.

(c) All of the mentioned

(d) None of the mentioned

The question was posed to me by my college professor while I was bunking the class.

I need to ask this question from Laplacian in Frequency Domain in section Image Enhancement of Digital Image Processing

Answer 1

Right option is (c) All of the mentioned

To elaborate: For the above given enhanced image the Laplacian subtraction suggest that the center coefficient of Laplacian mask is negative and so the center spike is negative with its immediate neighbors being positive.