Question

Applying Laplacian has which of the following result(s)?

(a) Produces image having greyish edge lines

(b) Produces image having featureless background

(c) All of the mentioned

(d) None of the mentioned

I have been asked this question in an interview for job.

The question is from Use of Second Order Derivative for Enhancement topic in division Image Enhancement of Digital Image Processing

Answer 1

Right choice is (c) All of the mentioned

The best I can explain: Since, Laplacian is a derivative operator, so, highlights the gray-level discontinuities in an image and deemphasizes areas with slowly varying gray levels. Hence, produces images having greyish edge lines superimposed on featureless background.