Question

The mask shown in the figure below belongs to which type of filter?

(a) Sharpening spatial filter

(b) Median filter

(c) Smoothing spatial filter

(d) Sharpening frequency filter

I have been asked this question by my school principal while I was bunking the class.

This key question is from Smoothing Spatial Filters topic in section Intensity Transformations and Spatial Filtering of Digital Image Processing

Answer 1

The correct option is (c) Smoothing spatial filter

The best explanation: The mask shown in the figure represents a 3×3 smoothing filter. Use of this filter yields the standard average of the pixels under the mask.