Question

Which of the following filter(s) results in a value as average of pixels in the neighborhood of filter mask.

(a) Smoothing linear spatial filter

(b) Averaging filter

(c) Lowpass filter

(d) All of the mentioned

I had been asked this question in an internship interview.

My doubt is from Smoothing Linear Spatial Filters in section Intensity Transformations and Spatial Filtering of Digital Image Processing

Answer 1

Right choice is (d) All of the mentioned

Explanation: The output as an average of pixels in the neighborhood of filter mask is simply the output of the smoothing linear spatial filter also known as averaging filter and lowpass filter.