Results 181 to 190 of about 5,322 (221)

Immersion digital in-line holographic microscopy

Optics Letters, 2006
Digital in-line holographic microscopy is a promising new tool for high resolution imaging. We demonstrate, by using latex beads, that a considerable increase in numerical aperture, and, therefore, resolution can be achieved if the space between a source and a CCD camera chip is filled with a high refractive index medium.
J, Garcia-Sucerquia, Wenbo, Xu, M H, Jericho, H J, Kreuzer   +3 more
openaire   +2 more sources

Superesolution in digital holographic microscopy

2011 10th Euro-American Workshop on Information Optics, 2011
In this contribution, we address with the possibility to overcome the limited resolving power of imaging systems beyond the limit imposed by Abbe's diffraction theory. We first review the mathematical foundations underlying superresolution (SR) from an information theory point of view and then we focus on two multiplexing approaches in digital ...
Alejandro Calabuig, Vicente Mico, Zeev Zalevsky, Carlos Ferreira, Javier Garcia   +4 more
openaire   +1 more source

Digital Holographic Microscopy to Assess Cell Behavior

2023
Digital holographic microscopy is an imaging technique particularly well suited to the study of living cells in culture, as no labeling is required and computed phase maps produce high contrast, quantitative pixel information. A full experiment involves instrument calibration, cell culture quality checks, selection and setup of imaging chambers, a ...
Brad, Bazow, Van K, Lam, Thuc, Phan, Byung Min, Chung, George, Nehmetallah, Christopher B, Raub   +5 more
openaire   +2 more sources

Digital Holographic Microscopy (DHM)

Imaging & Microscopy, 2006
Digital Holographic Microscopes (DHM) enables strictly noninvasive visualisation of unstained transparent, and partially reflective specimens, in real time, by providing simultaneously amplitude and phase changes of, a light wave transmitted or reflected.
Yves Emery, Etienne Cuche, Christian Depeursinge, Pierre Marquet, Benjamin Rappaz, Pierre Magistretti   +5 more
openaire   +1 more source

Autofocusing in digital holographic microscopy

3D Research, 2011
Many applications in non-destructive testing at a microscopic level and in live cell imaging require automated focusing due to unstable environmental conditions, moving specimen or the limited depth of field of the applied optical imaging systems.
Patrik Langehanenberg, Gert von Bally, Björn Kemper   +2 more
openaire   +1 more source

Coherence effects in digital in-line holographic microscopy

Journal of the Optical Society of America A, 2008
We analyze the effects of partial coherence in the image formation of a digital in-line holographic microscope (DIHM). The impulse response is described as a function of cross-spectral density of the light used in the space-frequency domain. Numerical simulation based on the applied model shows that a reduction in coherence of light leads to broadening
Unnikrishnan, Gopinathan, Giancarlo, Pedrini, Wolfgang, Osten   +2 more
openaire   +2 more sources

Digital Holography and Digital Holographic Microscopy

2015
Whereas conventional analog holography (AH) entails physical re-illumination of the hologram of the object with a reading beam and finding the 3D real or virtual image, digital holography (DH) is a numerical procedure that simulates Fresnel diffraction of light from the re-illuminated hologram on a computer and numerically determines the images, which ...
Georges T. Nehmetallah, Rola Aylo, Logan A. Williams   +2 more
openaire   +1 more source

Tomography by point source digital holographic microscopy

Applied Optics, 2014
We propose a tomographic method for point source inline holographic microscopy. By recording a set of holograms at different illumination angles, shadowing effects are eliminated resulting in three-dimensional images with the same precision at the micrometer-scale in all directions.
Clément, Remacha, Brenden Scott, Nickerson, Hans Jürgen, Kreuzer   +2 more
openaire   +2 more sources

Simultaneous Multiplane Imaging in Digital Holographic Microscopy

Journal of Display Technology, 2011
We describe a numerical method applied to the reconstruction of a digital hologram, that allows to obtain the image of an object at three planes at different depths simultaneously. In order to do this, we introduce a numerical quadratic deformed diffraction grating into the algorithm.
Paturzo Melania, Finizio A, Ferraro Pietro   +2 more
openaire   +4 more sources

Digital holographic microscopy with physical phase compensation

Optics Letters, 2009
An optical configuration for digital holographic microscopy is presented. Digital off-axis holograms are recorded by using a single-cube beam splitter in a nonconventional configuration so as to both split and combine a diverging spherical wavefront emerging from a microscope objective.
Qu, Weijuan, Yu, Yingjie, Chee Oi, Choo, Anand, Asundi   +3 more
openaire   +2 more sources