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Which of the following image component is characterized by a slow spatial variation?

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in Digital Image Processing by (701k points)
Which of the following image component is characterized by a slow spatial variation?

(a) Illumination component

(b) Reflectance component

(c) All of the mentioned

(d) None of the mentioned

The question was posed to me by my school principal while I was bunking the class.

My doubt is from Homomorphic filtering in division Intensity Transformations and Spatial Filtering of Digital Image Processing

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Right answer is (a) Illumination component

To explain I would say: The illumination component of an image is characterized by a slow spatial variation.

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