View Full Document

Invariance and Selectivity in the Ventral Visual Pat



View the full content.
View Full Document
View Full Document

6 views

Unformatted text preview:

Invariance and Selectivity in the Ventral Visual Pathway Stuart Geman Division of Applied Mathematics Brown University Providence Rhode Island 02912 USA Abstract Pattern recognition systems that are invariant to shape pose lighting and texture are never sufficiently selective they suffer a high rate of false alarms How are biological vision systems both invariant and selective Specifically how are proper arrangements of sub patterns distinguished from the chance arrangements that defeat selectivity in artificial systems The answer may lie in the nonlinear dynamics that characterize complex and other invariant cell types these cells are temporarily more receptive to some inputs than to others functional connectivity One consequence is that pairs of such cells with overlapping receptive fields will possess a related property that might be termed functional common input Functional common input would induce high correlation exactly when there is a match in the sub patterns appearing in the overlapping receptive fields These correlations possibly expressed as a partial and highly local synchrony would preserve the selectivity otherwise lost to invariance Keywords correlation synchrony microcircuitry nonlinearity binding vision 1 Introduction Practical computer vision systems answer practical questions Is there a license plate in the image What is the license plate number Is there a defect in the chip geometry How many faces are in the image Who is in the image Biological vision systems are less oriented towards a single question or set of questions and more oriented towards an ongoing process of image analysis Indeed real world images have essentially infinite detail which can be perceived only by a process that is itself ongoing and essentially infinite The more you look the more you see The implications of these remarks for biological vision systems are controversial One extreme viewpoint is that when faced with a complex image brains construct an ever more elaborate



Access the best Study Guides, Lecture Notes and Practice Exams

Loading Unlocking...
Login

Join to view Invariance and Selectivity in the Ventral Visual Pat and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Invariance and Selectivity in the Ventral Visual Pat and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?