Question

Which of the following filters response is based on ranking of pixels?

(a) Nonlinear smoothing filters

(b) Linear smoothing filters

(c) Sharpening filters

(d) Geometric mean filter

The question was asked in a national level competition.

Question is from Smoothing Spatial Filters in section Intensity Transformations and Spatial Filtering of Digital Image Processing

Answer 1

Right choice is (a) Nonlinear smoothing filters

The explanation: Order static filters are nonlinear smoothing spatial filters whose response is based on the ordering or ranking the pixels contained in the image area encompassed by the filter, and then replacing the value of the central pixel with the value determined by the ranking result.