Browsing College of Engineering & Architecture by Subject "Image reconstruction"

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Comparison of Laplacian differential reconstruction of inline holograms recorded at two different wavelengths and distances

Ryle, James P. ; Li, Dayan ; Sheridan, John T. (Optical Society of America, 2010-04-11)

We record two holograms using two different illuminating wavelengths. Subtracting these holograms, the resulting reconstruction is an approximation to the second order Laplacian differentiation of the object wave.
Dual wavelength digital holographic Laplacian reconstruction

Ryle, James P. ; Li, Dayan ; Sheridan, John T. (Optical Society of America, 2010-09-15)

Access to the spatial derivatives of an optical wave field can be used to enhance edge detection, focusing, and holographic imaging. It was recently shown that, by using digital holographic techniques, the Laplacian of an ...
Generalized in-line digital holographic technique based on intensity measurements at two different planes

Situ, Guohai ; Ryle, James P. ; Gopinathan, Unnikrishnan ; Sheridan, John T. (Optical Society of America, 2008-02-10)

In-line digital holography based on two-intensity measurements [Zhang et al. Opt. Lett. 29, 1787 (2004)], is modiﬁed by introducing a π shifting in the reference phase. Such an improvement avoids the assumption that the ...