Poster details
» Shift Variant Optical Systems in Imaging Algorithms
Presenter: Martin Rerabek
The properties of UWFC (Ultra Wide-Field Camera) astronomical systems along with specific visual data in astronomical images contribute to complicated evaluation of acquired image data. These systems contain a lot of different kinds of optical aberrations which negatively effect on image quality and imaging system transfer characteristics and cut precision of other astronomical measurement. It is very important to understand the ways how the astrometry measurements depend on optical aberrations and moreover how the optical aberrations affect the transfer characteristics of all optical system. If we define the PSF of optical system then we can use some suitable methods for restoration of original image. There are optical aberrations models for LSI/LSV (Linear Space Invariant/Variant) systems presented in this paper. These models are based on Seidel and Zernike approximating polynomials. Optical aberrations models serve us as suitable tools for understanding how to estimate and fit the wavefront aberration of real optical system. The real data from the BOOTES (Burst Observer and Optical Transient Exploring System) experiment are used for our simulations and modeling. The problems related to UWFC imagery have been addressed, especially restoration method using deconvolution algorithm in the presence of space variant PSF. The model of space variant imaging system and partially space variant optical system has been implemented in MATLAB. The “brute force” method has been used for restoration of testing images. The results of different deconvolution algorithms are demonstrated in this paper. This approach could help to improve the precision of astronomy measurements.
Coauthors:- Petr Páta, CTU in Prague