Qasim Zaidi


Qasim Zaidi is a Distinguished Professor of Vision Science at the State University of New York, College of Optometry. He did his Ph.D. at the University of Chicago on pre-retinal and retinal color mechanisms, and his post-doc at Bell Labs on higher-order color mechanisms. His current projects include color perception of real objects and neural mechanisms of 3-D shape perception. He is a recipient of the SUNY Chancellor's Award for Excellence in Scholarship & Creative Activities, and a Fellow of the Optical Society of America.


Colour Vision Meeting 2007: Color-Based Object Identification: Alternatives to Inverse Optics

Spectral-reflectances can characterize objects that do not differ in shape or texture, but lights reflected from objects change with illumination, so we tested whether people are good at color-based object-identification.

Under two distinct lights, we presented pairs of real objects, three of which were made from the same material, and observers picked the odd object. Object-identification was subject to systematic inaccuracies that ruled out color-constancy, contrast-constancy, inverse-optics and heuristic algorithms, instead observers seem to have used color dissimilarity along the vector parallel to the illuminant color change to pick the odd object.  The neglect of useful information and the use of a demonstrably limited assumption may reflect an "Opportunistic" Bayesian strategy.


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