Browsing by Subject "Image processing--Digital techniques"

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Browsing by Subject "Image processing--Digital techniques"

Now showing items 1-4 of 4

Fast numerical algorithm for the linear canonical transform

Hennelly, Bryan M. ; Sheridan, John T. (Optical Society of America, 2005-05-01)

The linear canonical transform (LCT) describes the effect of any quadratic phase system (QPS) on an input optical wave ﬁeld. Special cases of the LCT include the fractional Fourier transform (FRT), the Fourier transform ...
Generalizing, optimizing, and inventing numerical algorithms for the fractional Fourier, Fresnel, and linear canonical transforms

Hennelly, Bryan M. ; Sheridan, John T. (Optical Society of America, 2005-05-01)

By use of matrix-based techniques it is shown how the space–bandwidth product (SBP) of a signal, as indicated by the location of the signal energy in the Wigner distribution function, can be tracked through any quadraticphase ...
Key-space analysis of double random phase encryption technique

Monaghan, David S. ; Gopinathan, Unnikrishnan ; Naughton, Thomas J. ; Sheridan, John T. (Optical Society of America, 2007-09-10)

We perform a numerical analysis on the double random phase encryption/decryption technique. The key-space of an encryption technique is the set of possible keys that can be used to encode data using that technique. In the ...
Lateral image degradation in terrestrial laser scanning

Laefer, Debra F. ; Fitzgerald, Michael ; Maloney, Eoghan M. ; Coyne, David ; Lennon, Donal ; Morrish, Sean (International Association of Bridge and Structural Engineers, 2009-05)

The use of aerial laser scanning to detect change in infrastructure and buildings after major disasters has become increasingly common in recent years to help prioritize interventions. More recent efforts are being invested ...