High-resolution reconstruction of photon limited stellar images using phase gradients
Abstract
Phase-gradient and Knox-Thompson processes for determining the gradients of a stellar object's phase from speckle images are compared with respect to their behavior at low photon levels. The phase-gradient process is immune to the degrading effects of image wandering and image reentering, and is computationally simpler and faster than the Knox-Thompson process. Examples of reconstructions from simulated and real speckle images are presented.
- Publication:
-
Canadian Journal of Physics
- Pub Date:
- October 1988
- DOI:
- 10.1139/p88-139
- Bibcode:
- 1988CaJPh..66..847A
- Keywords:
-
- High Resolution;
- Image Processing;
- Speckle Interferometry;
- Stellar Spectra;
- Astronomical Photography;
- Atmospheric Turbulence;
- Phase Shift;
- Refractivity;
- Astronomy