题目:The Logic of Depth Cue Combination
主讲人:Christopher W. Tyler教授
Christopher W. Tyler,杰出的视觉神经科学家,自动立体图的创造者(Magic Eye魔眼),担任美国史密斯—凯特威尔眼科研究院(The Smith-Kettle well Eye Research Institute)脑成像中心主任,伦敦城市大学教授(City University of London)。
The perceived distance of objects in the scene, or perceived depth, is a topic of longstanding interest and importance in visual perception. The question arises how different depth cues are physiologically calibrated when acting alone, and how the multiple cues are combined into the overall depth percept. The issue of calibration of each cue to the reality remains unsolved. Former theories assume that the weighted cues combine by linear summation. These theories thus have no mechanism to explain situations in which multiple cues give strong individual estimates of perceived depth, since they would then sum to a value much larger than one (i.e., greater than veridical depth). In fact, the empirical data show that summation is not linear but hasnonlinear (saturating) promotion effect in which combinations of a few depth cues give close to veridical depth perception and adding more depth cues has no further effect (except to increase reliability). A new theory that accounts for these empirical data will be presented.
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