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What is the Second Derivative of Image Sharpening called?

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in Digital Image Processing by (701k points)
What is the Second Derivative of Image Sharpening called?

(a) Gaussian

(b) Laplacian

(c) Canny

(d) None of the mentioned

This question was addressed to me in an interview for job.

My query is from Sharpening Spatial Filters topic in section Intensity Transformations and Spatial Filtering of Digital Image Processing

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Best answer
Right answer is (b) Laplacian

Explanation: It is also called Laplacian.

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