The Nyquist sampling rate for spiraling curves
Langue
en
Article de revue
Ce document a été publié dans
Applied and Computational Harmonic Analysis. 2021, vol. 52, p. 198-230
Elsevier
Résumé en anglais
We consider the problem of reconstructing a compactly supported function from samples of its Fourier transform taken along a spiral. We determine the Nyquist sampling rate in terms of the density of the spiral and show ...Lire la suite >
We consider the problem of reconstructing a compactly supported function from samples of its Fourier transform taken along a spiral. We determine the Nyquist sampling rate in terms of the density of the spiral and show that below this rate spirals suffer from an approximate form of aliasing. This sets a limit to the amount of undersampling that compressible signals admit when sampled along spirals. More precisely, we derive a lower bound on the condition number for the reconstruction of functions of bounded variation, and for functions that are sparse in the Haar wavelet basis.< Réduire
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