Spatial, temporal and spectral pre-processing for colour vision.


Fourier transforms of the spectral radiance of natural objects were investigated. The average spectral power spectrum Sc(fc) is well described by Sc(fc) = exp (-beta fc), with fc the spectral frequency (cycles micron-1), and beta = 0.419 +/- 0.097 microns. Average spectral contrast (Cc = [epsilon fc not equal to 0 Sc(fc)/Sc(0)]1/2) was 0.224 +/- 0.127… (More)


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