Statistics of cone responses to natural images:implications for visual coding

摘要

We gathered hyperspectral images of natural, foliage-dominated scenes and converted them to human cone quantal catches to characterize the second-order redundancy present within the retinal photoreceptor array under natural conditions. The data are expressed most simply in a logarithmic response space, wherein an orthogonal decorrelation robustly produces three principal axes, one corresponding to simple changes in radiance and two that are reminiscent of the blue-yellow and red-green chromatic-opponent mechanisms found in the primate visual system. Further inclusion of spatial stimulus dimensions demonstrates a complete spatial decorrelation of these three cone-space axes in natural cone responses. # 1998 Optical Society of America [S0740-3232(98)02408-9] OCIS codes: 0120.0280, 330.4060, 330.1720, 330.5310, 120.5630.