Astronomy and Astrophysics – Astrophysics – Instrumentation and Methods for Astrophysics
Scientific paper
2009-09-03
International Journal of Power Control Signal and Computation(IJPCSC) Vol2. No.2, 2011, 119-123
Astronomy and Astrophysics
Astrophysics
Instrumentation and Methods for Astrophysics
9 figures, Proceedings of the International Conference on Advanced Computing, Cauvery College for Women & Bharathidasan Univer
Scientific paper
Shack Hartmann Sensor (SHS) is inflicted with significant background noise that deteriorates the wave-front reconstruction accuracy. In this paper, a simple method to remove the back ground noise with the use of Zernike polynomials is suggested. The images corresponding to individual array points of the SHS at the detector, placed at the focal plane are independently reconstructed using Zernike polynomials by the calculation of Zernike moments. Appropriate thresholding is applied on the images. It is shown with computational experiments that using Zernike Reconstructor along with usual thresholding improves the centroiding accuracy when compared to direct thresholding. A study was performed at different Signal to Noise ratio by changing the number of Zernike orders used for reconstruction. The analysis helps us in setting upper and lower bounds in the application of this denoising procedure.
Prasad Raghavendra B.
Roopashree M. B.
Vyas Akondi
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