Butterworth lowpass filter has a parameter, filter order, determining its functionality as very sharp or very smooth filter function or an intermediate filter function. If the parameter value is very high, the filter approaches to which of the following filter(s)?(a) Ideal lowpass filter(b) Gaussian lowpass filter(c) All of the mentioned(d) None of the mentionedThis question was posed to me during an online interview.The question is from Smoothing Frequency-Domain Filters topic in section Intensity Transformations and Spatial Filtering of Digital Image Processing

Butterworth lowpass filter has a parameter, filter order, determining

1.	Butterworth lowpass filter has a parameter, filter order, determining its functionality as very sharp or very smooth filter function or an intermediate filter function. If the parameter value is very high, the filter approaches to which of the following filter(s)?(a) Ideal lowpass filter(b) Gaussian lowpass filter(c) All of the mentioned(d) None of the mentionedThis question was posed to me during an online interview.The question is from Smoothing Frequency-Domain Filters topic in section Intensity Transformations and Spatial Filtering of Digital Image Processing
Answer» Correct option is (a) Ideal lowpass FILTER The BEST explanation: For high value of filter ORDER Butterworth lowpass filter behaves as Ideal lowpass filter, while for LOWER order value it has a smoother form behaving like GAUSSIAN lowpass filter.

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