Abstract
Local variations in visual stimuli are presumably the basis for the eventual generation of the full range of percepts arising from patterns of light that fall on the retina. Here we describe an analysis of the local statistical structure of luminance and spectral contrast in a database of natural scenes. By analyzing circular patches in luminance and hyper-spectral images we determined: 1) the joint distributions luminance and spectral content (together with the average luminance and spectral content in the patch, and the size of each patch); 2) the joint distribution of the size of low contrast luminance and spectral content (in this case in conjunction with the average luminance and spectral content of the low contrast regions); 3) the joint distribution of luminance contrast and spectral content in center-surround configurations; and 4) the joint distribution of contrast and orientation perpendicular to the greatest local changes of luminance and spectral content. These statistics agree with the perceptual effects elicited by the contrast, luminance, spectral distribution and orientation in visual stimuli, suggesting that that the statistics of natural environments are incorporated into the early visual processing to generate percepts of these basic visual qualities, and ultimately the full range of percepts elicited by the physical world.
Published Version
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