Computational models of vision are today's version of the camera model of the eye. Vision is a mental function that has been fairly successfully replicated in artificial intelligence. "Computational vision" often means visual artificial intelligence (AI) or "machine vision". David Marr's book Vision, published posthumously in 1982, played a pivotal role in the story. It presented a mathematical theory of visual function at each stage of the system from retinal input to object recognition. It also set an agenda for the subsequent three decades' research in vision science, not least because of the shortcomings of Marr's blueprints for artificial visual systems. Bayesianism is one of the central approaches in the modeling of perceptual systems. It is a compelling manifestation of the inferentialist idea that perception is the process of drawing conclusions about states of affairs in the external world on the basis of limited sensory data which underdetermine their distal cause.