Question

Which of the following filter(s) has the response in which the central pixel value is replaced by value defined by ranking the pixel in the image encompassed by filter?

(a) Order-Statistic filters

(b) Non-linear spatial filters

(c) Median filter

(d) All of the mentioned

The question was posed to me in an interview for job.

The query is from Smoothing Nonlinear Spatial Filter in chapter Intensity Transformations and Spatial Filtering of Digital Image Processing

Answer 1

Right option is (d) All of the mentioned

Explanation: An Order-Statistic filters also called non-linear spatial filters, response is based on ranking the pixel in the image encompassed by filter that replaces the central pixel value. A Median filter is an example of such filters.