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The illumination component of an image is characterized by a slow spatial variation. 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 mentionedThis question was addressed to me during an online exam.This interesting question is from Homomorphic filtering in chapter Intensity Transformations and Spatial Filtering of Digital Image Processing

Answer» CORRECT option is (a) The LOW frequency of Fourier transform of logarithm of the IMAGE

Explanation: The illumination component of an image is characterized by a slow spatial VARIATION, so, is ASSOCIATED with the low frequency of Fourier transform of logarithm of the image.


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