Results 211 to 220 of about 1,184,514 (267)

Digital hologram recording and stereo reconstruction from a single hologram

SPIE Proceedings, 2013
In this paper we present novel results on the reconstruction of stereoscopic information from a single phase-shift hologram captured using a 2:2 μm pixel-pitch CMOS camera in a holographic interferometer configuration. The low pixel-pitch camera allows the digitizing of holograms with a higher spatial-frequency than what has been reported in the ...
Angelo Arrifano, Marc Antonini, Paulo T. Fiadeiro, Manuela Pereira   +3 more
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Object reconstruction from noisy holograms

Optical Engineering, 1990
The inappropriate processing and digitization of an optical hologram to become a digital hologram can be modeled by additive noise superimposed on the hologram and followed by a clipping operator. Direct reconstruction of this noisy digital hologram will usually yield unsatisfactory results because the noise will be the dominating term on the ...
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Wavefront reconstruction using computer-generated holograms

SPIE Proceedings, 2012
We propose a new method to determine the wavefront of a laser beam, based on modal decomposition using computer-generated holograms (CGHs). Thereby the beam under test illuminates the CGH with a specific, inscribed transmission function that enables the measurement of modal amplitudes and phases by evaluating the first diffraction order of the ...
Christian Schulze, Daniel Flamm, Oliver A. Schmidt, Michael Duparré   +3 more
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Scanline rendering of digital HPO holograms and hologram numerical reconstruction

Proceedings of the 22nd Spring Conference on Computer Graphics, 2006
This paper presents a fast and complete rendering method that can be used for creating digital horizontal parallax only (HPO) holograms of a scene consisting of triangle mesh objects. This method solves visibility and occlusion problems and is capable of working with triangles as the basic primitive instead of the usually used points.
Martin Janda, Ivo Hanák, Václav Skala
openaire   +1 more source

Sound wave hologram and optical reconstruction

Proceedings of the IEEE, 1967
An acoustic hologram is constructed using a sound wave (20 kHz), scanning the acoustic fields by a microphone, and lighting a lamp by amplified electrical signals from the microphone. The original image is reconstructed to illuminate the sound wave hologram of reduced size by the laser light (6328 A) and observed by a microscope.
Y. Aoki, N. Yoshida, N. Tsukamoto, M. Suzuki   +3 more
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Image reconstruction from noisy digital holograms

IEE Proceedings F Radar and Signal Processing, 1990
Indexing terms: Hologmms, Image processing Abstract: The method of projection onto convex sets (POCS) is used in signal reconstruction to find a function that satisfies a collection of con- straints, provided each of these constraints defines a convex set.
C.P. Mariadassou, B. Yegnanarayana
openaire   +1 more source

Acoustical Holograms and Optical Reconstruction

1969
Theoretical and experimental investigations of the construction of acoustical holograms and the optical reconstruction of their images are described. The matrix representation of Gabor’s hologram is presented, and the matrix method is used to analyze the experimental results obtained.
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Reconstructing volume holograms without image field losses

Applied Optics, 1991
The reconstruction of volume holograms at wavelengths different from that of hologram formation suffers from the degradation of image quality and thus of an incomplete retrieval of the stored information. The major source of information loss is due to image field reduction.
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Reconstruction techniques of holograms from Spacelab 3

Applied Optics, 1987
Fluid transport effects in a ground-based laboratory are fairly well known. Bouyancy driven transport occurs when there is a local density change in the fluid. In a low-g environment these density changes become less important, and other transport mechanisms dominate.
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Reconstruction of Transmission Holograms in Reflection

Optica Acta: International Journal of Optics, 1974
It is shown that an object wave can be reconstructed from a hologram by reflecting the illuminating wave from it. The image thus formed arises due to the backward coherent scattering from the metallic silver particles in the emulsion.
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