Spring 2005
Tuesdays
12:00 GWC 604
Seminar
Schedule:<http://math.la.asu.edu/~tom/cognition/math+cogsched.html>
On
Tuesday, January 25, at 12:00 Noon
in GWC 604,
the Mathematics and Cognition Seminar will
present brief discussion with Tom Taylor
of the Department of Mathematics and Statistics
and the Center for Social Dynamics and Complexity
on the topic of
"A Bayesian
method for subpixel resolution in undersampled images."
Abstract
| Super-resolution methods for electro-optical image collection systems make use of pixel spillover from diffraction limited blurring (i.e. the Airy disk) to deduce information about the preblurred image on a finer scale than the pixel density of image collection device would suggest. In astronmy such systems are commonly designed to such that the diffraction limited disk spills over quite a few pixels for optimal image analysis. In detection-challenged, low signal to noise ratio situations, however, a system design with little spillover may be a preferred design choice; these are called undersampled imaging systems. In working with such systems astronomer may use a "jitter" technique to create artificial pixel spillover. In this talk we present a sequential Monte Carlo method implementation of a Bayesian subpixel tracking algorithm for point sources imaged in an undersampled image colection system, and present simulations illustrating the degree of subpixel localization obtainable in several different signal to noise environments. |