Illusions sometimes give us the keys to understand the mechanisms of the visual information processing. But, the mechanisms of the brightness illusions, for example the Mach band of the Craik-O'Brien effect, are not clear yet. In this paper, the role of the filling-in process on the brightness perception is explained. Its computational theory is discussed. And a neural network model of the filling-in process on the brightness perception is constructed based on the computational theory. Some properties of the Mach band and the Craik-O'Brien effect are simulated with the model, and its behavior is similar to some psychological experiment results.
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