- Compute the forward or inverse Fast Fourier transform.
- Apply one of 26 frequency domain filters including ideal filters, Butterworth filters, emphasis filters, Bartlett filters, Gaussian filters, Hanning filters, notch filters and a homomorphic filter.
- Create a frequency distance image for filter shaping.
- Create binary mask filters in the frequency domain.
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| IDRISI offers Fourier transformation analysis which is useful for noise removal.
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