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A frequency domain filter of the corresponding filter in spatial domain can be obtained by applying which of the following operation(s) on filter in spatial domain?

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A frequency domain filter of the corresponding filter in spatial domain can be obtained by applying which of the following operation(s) on filter in spatial domain?

(a) Fourier transform

(b) Inverse Fourier transform

(c) None of the mentioned

(d) All of the mentioned

The question was posed to me in quiz.

This intriguing question originated from Filtering in Frequency Domain in chapter Intensity Transformations and Spatial Filtering of Digital Image Processing

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The correct option is (a) Fourier transform

Easiest explanation: Filters in spatial domain and frequency domain has a Fourier transform pair relation.  A frequency domain filter of the corresponding filter in spatial domain can be obtained by applying inverse Fourier transform on spatial domain filter.

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