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Predictions for ModelFest data set. Data points are average contrast thresholds of 16 observers in 10 labs for 43 different targets. The solid curve is the prediction of the RV1 model. Parameter values: kc = 1, ks = 10.1, wc = 0.53, ρ = 2.4, β = 1.685, P0 = 1.4E−3. Note that changing P0 translates the entire predicted curve vertically on the logarithmic (dB) scale. Threshold contrast in dB = 20log(ct), where here ct is the 82% correct contrast threshold (RMS error = 1.09 dB).
