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Spectral analysis of spatial sampling by photoreceptors: Topological disorder prevents aliasing
Abstract
To determine whether the spatial disorder of human photoreceptors is sufficient to prevent aliasing distortion, optical transform techniques were used to compute the power spectrum of a 12′ × 13′ array of foveal cones treated as sampling points and also the post-sampling spectra of gratings at spatial frequencies above (80 c/deg) and below (30 c/deg) the nominal Nyquist frequency for this array. No trace of aliasing was observed in the spectrum of the sampled 80 c/deg grating. The conclusion is that spatial disorder in foveal receptor placement allows alias-free sampling without introducing any appreciable spatial noise. © 1982.
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