MotionIllusions

MotionIllusions - Motion Illusions As Optimal Percepts...

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Unformatted text preview: Motion Illusions As Optimal Percepts Whats Special About Perception? Arguably, visual perception is better optimized by evolution than other cognitive abilities. Human visual perception outperforms all modern computer vision systems. Understanding human vision will be helpful for building AI systems Perception is an inference problem Ambiguity of Perception One-to-many mapping of retinal image to objects in the world Same issue with 2D retina and 3D images Hermann von Helmholtz (1821-1894) German physician/physicist who made significant contributions to theories of vision Perception as unconscious inference Recover the most likely objects in the world based on the ambiguous visual evidence Percept is a hypothesis about what the brain thinks is out there in the world. Additional Knowledge Is Required To Perceive Innate knowledge E.g., smooth shapes are more common than jagged shapes E.g., any point in the image has only one interpretation Gestalt grouping principles Specific experience E.g., SQT is an unlikely letter combination in English E.g., bananas are yellow or green, not purple Illusions Most of the time, knowledge helps constrain perception to produce the correct interpretation of perceptual data. Illusions are the rare cases where knowledge misleads E.g., hollow face illusion http://www.michaelbach.de/ot/fcs_hollow-face/ Constraints: light source, shading cues, knowledge of faces The Aperture Problem Some slides adapted from Alex Pouget, Rochester The Aperture Problem The Aperture Problem The Aperture Problem Horizontal velocity (deg/s) Vertical velocity (deg/s) The Aperture Problem Horizontal velocity (deg/s) Vertical velocity (deg/s) The Aperture Problem The Aperture Problem Horizontal velocity (deg/s) Vertical velocity (deg/s) The Aperture Problem Horizontal velocity (deg/s) Vertical velocity (deg/s) The Aperture Problem Horizontal velocity (deg/s) Vertical velocity (deg/s) Standard Models of Motion Perception IOC : intercept of constraints...
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MotionIllusions - Motion Illusions As Optimal Percepts...

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