![]() Gibson hypothesized that there's sufficient information in the visual stimulus to specify a unique, unambiguous interpretation of 3D motion and depth. The optic flow then provides information about the observer's heading and the relative distance to each surface in the world. Then, the 3D motions of observer and objects can be inferred from the optical flow. The first step in motion perception is for the visual system to estimate optical flow from the changing pattern of light in the retinal image. Single point called the focus of expansion that corresponds to where the observer is heading. ![]() Near points move fast (long arrows),įar points move slowly (short arrows). Optical Flow: The diagram below is a representation of the physical motion in an image while an observer moves through the environmet.Įach arrow represents the speed and direction of motion for each Download and play the animation (4 Mb mpeg movie).ĭownload and play the movie (3.8 Mb QuickTime movie with sound).ĭownload and play the movie (1.9 Mb QuickTime movie with sound). But when set into motion, it is easy to interpret. Light displays" shown in class of people walking, dancing, etc.,ĭisplayed as the motion of a small number of dots attached to the
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