Question

In linear spatial filtering, what is the pixel of the image under mask corresponding to the mask coefficient w (1, -1), assuming a 3*3 mask?

(a) f (x, -y)

(b) f (x + 1, y)

(c) f (x, y – 1)

(d) f (x + 1, y – 1)

The question was asked in final exam.

This interesting question is from Spatial Filtering in section Intensity Transformations and Spatial Filtering of Digital Image Processing

Answer 1

Correct choice is (d) f (x + 1, y – 1)

The best explanation: The pixel corresponding to mask coefficient (a 3*3 mask) w (0, 0) is f (x, y), and so for w (1, -1) is f (x + 1, y – 1).