Perceptual Science Series

Physiologically Based Models of Stereovision

Dr. Ning Qian

Monday, October 24, 2005, 02:00pm - 03:00pm

Columbia University, Center Neurobiology & Behavior

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I will discuss some of our work on modeling stereoscopic depth perception based on physiological properties of binocular cells in the visual cortex.  I will show that binocular disparity maps can be effectively computed from stereograms with a population of complex cells, without explicit feature matching.  I will then describe a unified theory for understanding depth effects of both horizontal and vertical disparities.  I will present our psychophysical data for testing two key predictions of the theory.  Finally, I will show that our stereo model can be naturally combined with the motion-energy model to explain a family of Pulfrich depth illusions, and will address some recent criticisms of this explanation.

Dr. Ning Qian