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• W2134217087 abstract "Variations in illumination on a scene and trichromatic sampling by the eye limit inferences about scene content. The aim of this work was to elucidate these limits in relation to an ideal observer using color signals alone. Simulations were based on 50 hyperspectral images of natural scenes and daylight illuminants with correlated color temperatures 4000 K, 6500 K, and 25,000 K. Estimates were made of the (Shannon) information available from each scene, the redundancies in receptoral and postreceptoral coding, and the information retrieved by an observer identifying corresponding points across image pairs. For the largest illuminant difference, between 25,000 K and 4000 K, a postreceptoral transformation providing minimum redundancy yielded an efficiency of about 80% in the information retrieved. This increased to about 89% when the transformation was optimized directly for information retrieved, corresponding to an equivalent Gaussian noise amplitude of 3.0% or to a mean of 3.6 x 10(4) distinct identifiable points per scene. Using color signals to retrieve information from natural scenes can approach ideal observer efficiency levels." @default.
• W2134217087 created "2016-06-24" @default.
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• W2134217087 date "2009-08-31" @default.
• W2134217087 modified "2023-10-14" @default.
• W2134217087 title "Approaching ideal observer efficiency in using color to retrieve information from natural scenes" @default.
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• W2134217087 doi "https://doi.org/10.1364/josaa.26.000b14" @default.
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