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arXiv · 1811.01771

The Nyquist sampling rate for spiraling curves

Philippe Jaming·Felipe Negreira·José Luis Romero
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Abstract

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.

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Philippe Jaming, Felipe Negreira, José Luis Romero. 2018-11-05. The Nyquist sampling rate for spiraling curves. https://arxiv.org/abs/1811.01771

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