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In biological systems, such as human visual system, there are
constraints
on the orientation of one eye relative to the other. The most important
one is the fixation constraint illustrated on the left. Fixation constraint
refers to the fact that the visual axes of the eyes intersect in 3D.
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In contrast to biological systems, artificial ones usually don't use any
constraints; artificial systems are intended to be general. To get some
intuition about what it means to have a general system without the fixation
constraint, look at the picture shown on the left. If generality were important
in visual perception, we all would have looked like that.
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