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The natural and artificial image patches that were used in the experiment. Image patches spanned the naturally occurring range of hues and skews in the pixel histogram. To ease comparison to existing data sets, a Maltese cross image, a random-dot image, and a 1/f noise image were also included in the image sets. Stimuli were smoothly attenuated with a cosine window (1.0° at half height) when displayed in the experiments.
