Browsing by Subject "Image processing"

Now showing items 1-3 of 3

Holography : an interpretation from the phase-space point of view

Situ, Guohai ; Sheridan, John T. (Optical Society of America, 2007-12-15)

The formation of holograms is interpreted as the consequence of the bilinearity of the ambiguity function. Reconstruction can then be regarded as the manipulation of the ambiguity function. Specifically, we show that in ...
Noninterferometric phase retrieval using a fractional Fourier system

Gopinathan, Unnikrishnan ; Situ, Guohai ; Naughton, Thomas J. ; Sheridan, John T. (Optical Society of America, 2008-01-01)

The signal extraction method based on intensity measurements in two close fractional Fourier domains is examined by using the phase space formalism. The fractional order separation has a lower bound and an upper bound that ...
Optical image encryption by random shifting in fractional Fourier domains

Hennelly, Bryan M. ; Sheridan, John T. (Optical Society of America, 2003-02-15)

A number of methods have recently been proposed in the literature for the encryption of two-dimensional information by use of optical systems based on the fractional Fourier transform. Typically, these methods require ...