Image Restoration

In order to realize the full potential of the next generation of extremely large aperture telescopes (e.g., the European Extremely Large Telescope, the Giant Magellan Telescope, and the Thirty Meter Telescope), as well as large aperture telescopes that will operate during daylight (e.g. the Daniel K. Inouye Solar Telescope), it is essential that techniques are developed that can yield high-resolution, high contrast imagery from observations taken through strong atmospheric turbulence.

Images in the left column show data acquired without (top ) and with (bottom) adaptive optics compensation. The images in the right column show the objects recovered using our multi-frame blind deconvolution algorithm.

Our current interests in this area of research are in developing advanced image restoration algorithms, methods for ultra-high resolution wave front sensing, novel techniques for adaptive optics compensation, and approaches that improve the synergy between image acquisition and post processing. Advances in these topics will benefit a wide range of studies in astronomy including globular clusters, the cores of Galaxies, Galaxy-Galaxy lensing, exoplanets, Kepler fields, binary brown dwarfs, proto-planetary disks, and asteroid systems. Outside of the academic world it will have application for monitoring the health and safety of the US assets in the near-Earth space environment (which is crucial to national security) and also for downward imaging (surveillance) from high altitude platforms.

Restoration of AO compensated speckle data of Alpha Andromeda obtained with the 8.4m Large Binocular Telescope in AZ. Example speckle frame (left), model of speckle frame (center) and object recovered from 200 frames of data showing two stars with separation of 18 milli-arcsec (diffraction-limited resolution is 19 milli-arcsec) and a contrast ratio of 0.13.
This figure demonstrates the performance of our baseline MFBD algorithm vs. that of the standard speckle interferometric (SI) reconstructions, both using the same 60 ms speckle data acquired with ‘Alopeke at the Gemini North 8-m telescope. The left images show the results from our speckle interferometry (SI) Fourier-based analysis of 5000, 60 ms frames for the V=9 stellar system TOI-884 (top left) and 3000, 60 ms frames for the stellar system α Com (bottom left) with both systems observed at 832 nm. The top right and bottom right images show the same data reduced with our MFBD algorithm but using only 1,000 and 500 image frames respectively