Question

In which of the following cases, we wouldn’t worry about the behaviour of sharpening filter?

(a) Flat segments

(b) Step discontinuities

(c) Ramp discontinuities

(d) Slow varying gray values

The question was posed to me in quiz.

My question is taken from Sharpening Spatial Filters topic in chapter Intensity Transformations and Spatial Filtering of Digital Image Processing

Answer 1

Correct choice is (d) Slow varying gray values

The explanation is: We are interested in the behaviour of derivatives used in sharpening in the constant gray level areas i.e., flat segments, and at the onset and end of discontinuities, i.e., step and ramp discontinuities.