Abstract
Fracture surfaces are occasionally modelled by Fourier’s two-dimensional series that can be converted into digital 3D reliefs mapping the morphology of solid surfaces. Such digital replicas may suffer from various artefacts when processed inconveniently. Spatial aliasing is one of those artefacts that may devalue Fourier’s replicas. According to the Nyquist–Shannon sampling theorem the spatial aliasing occurs when Fourier’s frequencies exceed the Nyquist critical frequency. In the present paper it is shown that the Nyquist frequency is not the only critical limit determining aliasing artefacts but there are some other frequencies that intensify aliasing phenomena and form an infinite set of points at which numerical results abruptly and dramatically change their values. This unusual type of spatial aliasing is explored and some consequences for 3D computer reconstructions are presented.
Graphical Abstract
Fourier’s replicas of scanned surfaces correctly reproduce all morphological features only if the number N of harmonic terms in the Fourier sum does not exceed a critical value derived from the Nyquist frequency of the scanned original. Incorporating harmonic terms of higher frequencies in the Fourier sum, an abrupt increase of aliasing effects occurs whenever the frequencies in the Fourier sum reach even multiples of the Nyquist frequency. Illustration N = 50 represents a correct reproduction whereas illustrations N = 228 and N = 440 show critical abrupt increases of aliasing artifacts.
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Acknowledgments
This work was supported by the Grant Agency of the Czech Republic under contract no. 13-03403S. One of us (T.F.) was partly supported on the basis of the grant no. LO 1408 within the program I-LO (NPU I) administered by the Ministry of Education, Youth and Sports of the Czech Republic.
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Ficker, T., Martišek, D. 3D Image Reconstructions and the Nyquist–Shannon Theorem. 3D Res 6, 23 (2015). https://doi.org/10.1007/s13319-015-0057-4
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DOI: https://doi.org/10.1007/s13319-015-0057-4