Question

The reflectance component of an image varies abruptly particularly at the junction of dissimilar objects. The characteristic lead to associate illumination with __________

(a) The low frequency of Fourier transform of logarithm of the image

(b) The high frequency of Fourier transform of logarithm of the image

(c) All of the mentioned

(d) None of the mentioned

This question was posed to me during an online interview.

Origin of the question is Homomorphic filtering in section Intensity Transformations and Spatial Filtering of Digital Image Processing

Answer 1

The correct option is (b) The high frequency of Fourier transform of logarithm of the image

To elaborate: The reflectance component of an image varies abruptly, so, is associated with the high frequency of Fourier transform of logarithm of the image.