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Which of the following filter(s) attenuates high frequency while passing low frequencies of an image?

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Which of the following filter(s) attenuates high frequency while passing low frequencies of an image?

(a) Unsharp mask filter

(b) Lowpass filter

(c) Zero-phase-shift filter

(d) All of the mentioned

I had been asked this question during an interview.

The question is from Filtering in Frequency Domain in portion Intensity Transformations and Spatial Filtering of Digital Image Processing

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Correct option is (b) Lowpass filter

Explanation: A lowpass filter attenuates high frequency while passing low frequencies.

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