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In general, which of the following assures of no ringing in the output?(a) Gaussian Lowpass Filter(b) Ideal Lowpass Filter(c) Butterworth Lowpass Filter(d) All of the mentionedThe question was posed to me during an online exam.Origin of the question is Gaussain Lowpass and Sharpening Frequency Domain Filters topic in section Filtering in Frequency Domain of Digital Image Processing

Answer»

Correct CHOICE is (a) Gaussian LOWPASS FILTER

The explanation: Using Gaussian Lowpass Filter no ringing is assured, but IDEAL Lowpass Filter and BUTTERWORTH Lowpass Filter of order 2and more produces significant ringing.



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