Point-spread function reconstruction in ground-based astronomy

Computer Science Presentation

Dr. Raymond Chan
Choh-Ming Li Professor and Chairman, Department of Mathematics
The Chinese University of Hong Kong
SIAM Fellow and Member of the SIAM Council

Point-spread function reconstruction in ground-based astronomy

Because of atmospheric turbulence, images of objects in outer space acquired via ground-based telescopes are usually blurry. One way to estimate the blurring kernel or point spread function (PSF) is to make use of the aberration of wavefront received at the telescope, i.e., the phase. However only the low-resolution wavefront gradients can be collected by wavefront sensors. In this talk, I will discuss how to use regularization methods to reconstruct high-resolution phase gradients and then use them to recover the phase and the PSF in high accuracy. I will end by relating the problem to high-resolution image reconstruction and methods for solving it.

Wednesday, July 19, 2017
10:00 -11:00 am
Manchester Hall, Room 229