Question

Which of the following method is/are used for padding the image?

(a) Adding rows and column of 0 or other constant gray level

(b) Simply replicating the rows or columns

(c) All of the mentioned

(d) None of the mentioned

This question was addressed to me during an internship interview.

My enquiry is from Spatial Filtering topic in section Intensity Transformations and Spatial Filtering of Digital Image Processing

Answer 1

Correct option is (c) All of the mentioned

The best explanation: In neighborhood operation for spatial filtering using square mask, padding of original image is done to obtain filtered image of same size as of original image done, by adding rows and column of 0 or other constant gray level or by replicating the rows or columns of the original image.