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Which of the following is a second-order derivative operator?

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Which of the following is a second-order derivative operator?

(a) Histogram

(b) Laplacian

(c) Gaussian

(d) None of the mentioned

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This interesting question is from Combining Spatial Enhancements Methods in portion Intensity Transformations and Spatial Filtering of Digital Image Processing

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Correct answer is (b) Laplacian

To explain: Laplacian is a second-order derivative operator.

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