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Taken as a starting point, this simple yet powerful
predictivity principle has surprisingly rich implications. Suppose
that we want to design a visual system that generates accurate
predictions of the occlusion sequence in
Figure 1a--d. If the depth relation
between the rectangular occluder and the moving circle is known, then
it is easy to predict the disappearance of the circle; the system
would have to know only the location and velocity of the circle and of
the occluder.
The reappearance of the circle (Figure 1d) is harder
to predict; Figure 1c contains no direct evidence that
a circle is about to appear anywhere. Nevertheless, if the visual
system can predict accurately the reappearance of the circle,
then it would more completely satisfy the predictivity principle. We
therefore conclude that the predictivity principle implies that the
visual system should predict disocclusion events like the
reappearance of the circle in Figure 1d, as well as
occlusion events.
Next: Prediction of Disocclusion
Up: The Predictivity Principle:
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