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

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

(a) Fourier transform

(b) Inverse Fourier transform

(c) None of the mentioned

(d) All of the mentioned

This question was posed to me in unit test.

My question is based upon Filtering in Frequency Domain in chapter Intensity Transformations and Spatial Filtering of Digital Image Processing

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Right option is (b) Inverse Fourier transform

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

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