Results 261 to 270 of about 198,881 (290)

Phase-shifting digital holography

Optics Letters, 1997
A new method for three-dimensional image formation is proposed in which the distribution of complex amplitude at a plane is measured by phase-shifting interferometry and then Fresnel transformed by a digital computer. The method can reconstruct an arbitrary cross section of a three-dimensional object with higher image quality and a wider viewing angle ...
I, Yamaguchi, T, Zhang
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Continuous phase-shifting holography

Journal of the Optical Society of America A, 2019
A scanning full-field interferometer is a key device in the optical scheme of digital hyperspectral hologram registration. Behind the theory of hyperspectral holography is Fourier transform spectroscopy, wherein the set of spectrally resolved complex amplitudes of the object’s hyperspectral field is obtained via the Fourier transform of a series of ...
Sergey G. Kalenkov, Georgy S. Kalenkov, Alexander E. Shtanko   +2 more
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Dynamic phase-shifting photoelasticity

Applied Optics, 2001
The application of phase-shifting photoelasticity to a real-time dynamic event involves simultaneous recording of the four phase-shifted images. Here an instrument, believed to be novel, is developed and described for this purpose. Use of a Multispec Imager is introduced into digital photoelasticity for the first time to our knowledge.
A, Asundi, L, Tong, C G, Boay
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Phase-shift coherence holography

Optics Letters, 2010
We propose and experimentally demonstrate a new reconstruction scheme for coherence holography using computer-generated phase-shift coherence holograms. A 3D object encoded into the spatial coherence function is reconstructed directly from a set of incoherently illuminated computer-generated holograms with numerically introduced phase shifts.
Dinesh N, Naik, Takahiro, Ezawa, Yoko, Miyamoto, Mitsuo, Takeda   +3 more
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Parallel phase-shifting color digital holography using two phase shifts

Applied Optics, 2009
We propose parallel phase-shifting color digital holography using two phase shifts. This technique enables the instantaneous acquisition of three-dimensional information of a moving color object. The interference fringe image that contains six holograms with two phase shifts for three wavelengths is recorded by a single shot exposure.
Takashi, Kakue, Tatsuki, Tahara, Kenichi, Ito, Yuki, Shimozato, Yasuhiro, Awatsuji, Kenzo, Nishio, Shogo, Ura, Toshihiro, Kubota, Osamu, Matoba   +8 more
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Phase shift selection for two-step generalized phase-shifting interferometry

Applied Optics, 2011
A phase shift selection method is proposed to design algorithms immune against phase shift errors in two-step generalized phase-shifting interferometry. A general formula for wavefront reconstruction error is derived, and its specific expressions for two common errors are also given.
Xiangfeng, Xu, Luzhong, Cai, Hongguang, Yuan, Qian, Zhang, Guangcan, Lu, Chu, Wang   +5 more
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Accurate Phase Shift Extraction for Generalized Phase-Shifting Interferometry

Chinese Physics Letters, 2010
An accurate phase shift extraction method for generalized phase-shifting interferometry is suggested. Based on the nearly random phase distribution of the diffraction field of the object, a singular formula is derived to calculate the unknown phase shift without the requirements of an iteration process or the selection of the correct value from two or ...
Xu Xian-Feng, Cai Lu-Zhong, Wang Yu-Rong, Li Dai-Lin   +3 more
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Phase shifting for nonsinusoidal waveforms with phase-shift errors

Journal of the Optical Society of America A, 1995
In phase measurement systems that use phase shifting techniques, phase errors that are due to nonsinusoidal waveforms can be minimized by applying synchronous phase shifting algorithms with more than four samples. However, when the phase shift calibration is inaccurate, these algorithms cannot eliminate the effects of nonsinusoidal characteristics.
K. Hibino, K.G. Larkin, B. F. Oreb, D. I. Farrant   +3 more
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Embedded phase shifting: Robust phase shifting with embedded signals

2015 IEEE Conference on Computer Vision and Pattern Recognition (CVPR), 2015
We introduce Embedded PS, a new robust and accurate phase shifting algorithm for 3D scanning. The method projects only high frequency sinusoidal patterns in order to reduce errors due to global illumination effects, such as subsurface scattering and interreflections.
Daniel Moreno, Kilho Son, Gabriel Taubin
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Algorithm immune to tilt phase-shifting error for phase-shifting interferometers

Applied Optics, 2000
As a phase shifter usually suffers from both translational and tilt-shift errors during shifting, so every pixel in the same interferogram will have a different phase-shift value. Thus nonlinear phase-measurement errors cannot be avoided, but even translational-shift error has been corrected effectively.
M, Chen, H, Guo, C, Wei
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