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Which of the facts(s) is/are true for the first order derivative of a digital function?

Which of the facts(s) is/are true for the first order derivative of a digital function? Correct Answer Must be nonzero along the gray-level ramps

The first order derivative of a digital function is defined as: Must be zero in the areas of constant grey values. Must be nonzero at the onset of a gray-level step or ramp discontinuities. Must be nonzero along the gray-level ramps.

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