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Which of the following mask(s) is/are used to sharpen images by subtracting a blurred version of original image from the original image itself?

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Which of the following mask(s) is/are used to sharpen images by subtracting a blurred version of original image from the original image itself?

(a) Unsharp mask

(b) High-boost filter

(c) All of the mentioned

(d) None of the mentioned

The question was posed to me in a national level competition.

The query is from Use of Second Order Derivative for Enhancement in section Image Enhancement of Digital Image Processing

1 Answer

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Correct answer is (c) All of the mentioned

For explanation: Unsharp mask sharpens images by subtracting a blurred version of original image from the original image itself.

A high-boost filter is a generalized form of unsharp mask.

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