Perceptual Science Series
Physiologically Based Models of Stereovision
Dr. Ning Qian
Monday, October 24, 2005, 02:00pm - 03:00pm
Columbia University, Center Neurobiology & Behavior
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.