Journal ArticleDOI
Resolution enhancement by aperture synthesis in digital holography
Thomas Kreis,Karsten Schluter +1 more
TLDR
In this paper, the point spread function of double-aperture digital holography is determined and an experimental method for the determination of this shift with subpixel accuracy is given.Abstract:
The resolution of digital holography as an optical imaging system is described by the point spread function of the system. Here the point spread function of double-aperture digital holography is determined. It promises the possibility of a resolution increase by the use of synthetic apertures, where we combine the digital holograms of two CCD arrays in one large hologram and reconstruct, or we superpose coherently the two reconstructed wave fields after a proper shift. An experimental method for the determination of this shift with subpixel accuracy is given. Furthermore, experimental results on numerically reconstructed wave fields from synthetic holograms stemming from two mutually shifted digital holograms of the same scene are presented.read more
Citations
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Journal ArticleDOI
Fourier ptychography: current applications and future promises
Pavan Chandra Konda,Lars Loetgering,Kevin C. Zhou,Shiqi Xu,Andrew R. Harvey,Roarke Horstmeyer +5 more
TL;DR: This review presents details about a relatively new procedure termed Fourier ptychography (FP), which addresses the above trade-off to produce gigapixel-scale images without requiring any moving parts.
Journal ArticleDOI
Image quality improvement of digital holography by superposition of reconstructed images obtained by multiple wavelengths.
TL;DR: A method to improve the image quality of a digital holographic reconstructed image by means of speckle reduction by superposing reconstructed images with different wavelengths.
Journal ArticleDOI
THz holography in reflection using a high resolution microbolometer array.
Peter Zolliker,Erwin Hack +1 more
TL;DR: The use of digital THz holography for surface profilometry as well as its potential for video-rate imaging are highlighted and Fourier transform phase retrieval to phase stepping methods are compared.
Journal ArticleDOI
High resolution digital holographic synthetic aperture applied to deformation measurement and extended depth of field method
TL;DR: The potential of the synthetic-aperture method in digital holography to increase the resolution, to perform high accuracy deformation measurement, and to obtain a three-dimensional topology map is discussed.
Journal ArticleDOI
Reflective Fourier ptychographic microscopy using a parabolic mirror.
TL;DR: A darkfield illuminator for reflective FPM consisting of a parabolic mirror and a flat LED panel is proposed, which increases the signal-to-noise ratio of the acquired images because the normal beam of each LED is directed toward the object.
References
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Book
Handbook of Holographic Interferometry: Optical and Digital Methods
TL;DR: In this paper, the Fourier Transform is used for the reconstruction of digital Holograms, and the convolutional approach is used to reconstruct the Holographic Histogram.
Journal ArticleDOI
Direct phase determination in hologram interferometry with use of digitally recorded holograms
TL;DR: In this paper, the phase determination in hologram interferometry is performed using a CCD target and phase estimation from the digitally sampled holograms, which are then used to calculate the phase of the interference phase.
Journal ArticleDOI
Measurement of the Diameter of α Orionis with the Interferometer.
Albert A. Michelson,F. G. Pease +1 more
Journal ArticleDOI
A circle fitting procedure and its error analysis
TL;DR: In this paper, an efficient least squares circle fitting procedure and its general random-error analysis are described, and the first-order random errors of the center coordinates and the radius of the fitted circle are discussed in detail.
Journal ArticleDOI
Suppression of the dc term in digital holography
TL;DR: In this article, the authors discuss the suppression of the dc term in digital holography and propose a solution to this problem, which they call suppression of dc-term in holographic data.