Reduction of speckle in digital holography by discrete Fourier filtering
J. Maycock, B.M. Hennelly, J.B. Mc Donald, Y. Frauel, A. Castro, B. Javidi, and T.J. Naughton
J. Opt. Soc. Am. A 24(6), 1617-1622 (2007)
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).
Keywords (OCIS): 100.2000 Digital image processing, 030.4280 Noise in imaging systems, 030.6140 Speckle, 090.2880 Holographic interferometry, 070.2580 Fourier optics.