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15 January 2008 Reconstruct three-dimensional image by two-wavelength digital holographic contouring
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The reconstruction of digital hologram is a key topic in the research of digital holography, which is maturely developed for the reconstruction of two-dimensional image. Recently, the reconstruction of three-dimensional image has attracted much more attention. In this paper, we apply the two-wavelength digital holographic contouring method to obtain the three-dimensional image, the basic idea of which is to reconstruct the shape through the phase difference that can be numerically calculated by Fresnel diffraction algorithm. Considering the fact that the obtained phase is wrapped on the interval (-π, π], and the unwrap algorithm always fails for the object with large height steps or spatially isolated areas, we adopt the two-wavelength digital holography to provide an equivalent longer wavelength such that the obtained phase is continuous everywhere. The experiment results prove the feasibility and efficiency of the method.
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Qing Tian, Hui Wang, Hongzhen Jin, and Yong Li "Reconstruct three-dimensional image by two-wavelength digital holographic contouring", Proc. SPIE 6832, Holography and Diffractive Optics III, 68321R (15 January 2008);

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