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A Butterworth filter of what order has no ringing?(a) 1(b) 2(c) 3(d) 4The question was posed to me in quiz.This question is from Smoothing Frequency-Domain Filters topic in division Intensity Transformations and Spatial Filtering of Digital Image Processing

Answer» CORRECT answer is (a) 1

Explanation: A BUTTERWORTH filter of ORDER 1 has no ringing and ringing exist for order 2 although is imperceptible. A Butterworth filter of higher order shows significant factor of ringing.


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