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If r be the gray-level of image before processing and s after processing then which expression defines the negative transformation, for the gray-level in the range [0, L-1]?

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If r be the gray-level of image before processing and s after processing then which expression defines the negative transformation, for the gray-level in the range [0, L-1]?

(a) s = L – 1 – r

(b) s = crᵞ, c and ᵞ are positive constants

(c) s = c log (1 + r), c is a constant and r ≥ 0

(d) none of the mentioned

This question was addressed to me during an interview.

My question is taken from Basic Grey Level Transformation topic in division Image Enhancement of Digital Image Processing

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The correct answer is (a) s = L – 1 – r

Explanation: The expression for negative transformation is given as: s = L – 1 – r.

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