KEYWORDS: Digital holography, 3D image reconstruction, Reconstruction algorithms, Holography, Digital imaging, 3D image processing, Holograms, Fringe analysis, Near field diffraction, Charge-coupled devices
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.
KEYWORDS: Digital holography, Holograms, 3D image reconstruction, 3D image processing, 3D metrology, Charge-coupled devices, Image processing, Digital imaging, Holography, Reconstruction algorithms
In this paper, we introduce the potentialities of the digital hologram for the three-dimensional shape measurement from
numerical reconstructed image. The image processing of the Fresnel digital hologram recorded by CCD sensor and the
algorithm for 3d shape reconstruction is taken into account. Firstly, we stitch a series of small digital holograms to obtain a
hologram with larger size. Secondly, the reconstructed image sequences of different depth planes are obtained by
numerical reconstructing hologram. Finally, the depth information of each sample point of object is gained by algorithm of
focus measure evaluation, in which the maximum focus measure of a region is found by the grey level variance of image
sequence. The basic principle of this technique and its experimental verification are presented.
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