Reduction of speckle in digital holography by discrete Fourier filtering.
We present a digital signal processing technique that reduces the speckle content in reconstructed digital holograms. The method is based on sequential sampling of the discrete Fourier transform of the reconstructed image field. Speckle reduction is achieved at the expense of a reduced intensity and resolution, but this trade-off is shown to be greatly superior to that imposed by the traditional mean and median filtering techniques. In particular, we show that the speckle can be reduced by half with no loss of resolution (according to standard definitions of both metrics).
Maycock
Jonathan
J
Department of Computer Science, National University of Ireland, Maynooth, County Kildare, Ireland.
Hennelly
Bryan M
BM
McDonald
John B
JB
Frauel
Yann
Y
Castro
Albertina
A
Javidi
Bahram
B
Naughton
Thomas J
TJ