Results 41 to 50 of about 1,601,477 (275)

Freeform optics for variable extended depth of field imaging

Optics Express, 2021
Imaging depth of field is shallow in applications with high magnification and high numerical aperture, such as microscopy, resulting in images with in- and out-of-focus regions. Therefore, methods to extend depth of field are of particular interest. Researchers have previously shown the advantages of using freeform components to extend depth of field ...
Sara Moein, Thomas J. Suleski
openaire   +2 more sources

Gravitational lensing by point masses on regular grid points [PDF]

, 2006
It is shown that gravitational lensing by point masses arranged in an infinitely extended regular lattice can be studied analytically using the Weierstrass functions.
Abramowitz, Afonso, Ahlfors, Alcock, An, An, Apostol, Asada, Blandford, Bourassa, Calchi Novati, Chang, Chang, De Jong J., Gil-Merino, Granot, Irwin, Jin H. An, Kayser, Keeton, Koblitz, Kochanek, Lang, Lang, Morgan, Nityananda, Paczyński, Petters, Press, Schechter, Schechter, Schneider, Schneider, Schneider, Schramm, Silverman, Subramanian, Vietri, Wambsganss, Wambsganss, Witt, Witt, Witt, Young   +43 more
core   +4 more sources

Monocular metasurface camera for passive single-shot 4D imaging

Nature Communications, 2023
The authors present a monocular camera equipped with a single-layer metalens for passive single-shot 4D imaging. It can simultaneously perform high-accuracy depth sensing and highfidelity polarization imaging over an extended depth of field.
Zicheng Shen, Feng Zhao, Chunqi Jin, Shuai Wang, Liangcai Cao, Yuanmu Yang   +5 more
doaj   +1 more source

All-in-Focus Sweep Imaging Based on Wigner Distribution Function

IEEE Access, 2018
To extend the depth of field, the all-in-focus image can be achieved via the computational imaging method by designing the data acquisition process under the condition of maintaining the signal-to-noise ratio.
Chang Liu, Shan Gao, Xing Zhao, Jun Qiu
doaj   +1 more source

Depth-of-Field-Extended Plenoptic Camera Based on Tunable Multi-Focus Liquid-Crystal Microlens Array

Sensors, 2020
Plenoptic cameras have received a wide range of research interest because it can record the 4D plenoptic function or radiance including the radiation power and ray direction.
Mingce Chen, Wenda He, Dong Wei, Chai Hu, Jiashuo Shi, Xinyu Zhang, Haiwei Wang, Changsheng Xie   +7 more
doaj   +1 more source

Fast Extended Depth-of-Field Reconstruction for Complex Holograms Using Block Partitioned Entropy Minimization

Applied Sciences, 2018
Optical scanning holography (OSH) is a powerful and effective method for capturing the complex hologram of a three-dimensional (3-D) scene. Such captured complex hologram is called optical scanned hologram. However, reconstructing a focused image from an
Peter Wai Ming Tsang, Ting-Chung Poon, Jung-Ping Liu   +2 more
doaj   +1 more source

Multispectral Extended Depth-of-Field Imaging via Stochastic Wavefront Optimization

IEEE Open Journal of Signal Processing
Extended depth-of-field (EDoF) is a desirable attribute for imaging systems where all features in the scene are in focus despite their relative distance.
Exequiel Oliva, Nelson Diaz, Samuel Pinilla, Esteban Vera   +3 more
doaj   +1 more source

Rigorous electromagnetic analysis of a microcylindrical axilens with long focal depth and high transverse resolution [PDF]

, 2001
We first present nonparaxial designs for a microcylindrical axilens with different long focal depths and rigorously analyze electromagnetic field distributions of the axilens using integral equations and the boundary-element method.
Dong, BZ, Gu, BY, Liu, J, Wang, J, Yang, GZ   +4 more
core   +1 more source

Spatiotemporal and quantitative analyses of phosphoinositides – fluorescent probe—and mass spectrometry‐based approaches

FEBS Letters, EarlyView.
Fluorescent probes allow dynamic visualization of phosphoinositides in living cells (left), whereas mass spectrometry provides high‐sensitivity, isomer‐resolved quantitation (right). Their synergistic use captures complementary aspects of lipid signaling. This review illustrates how these approaches reveal the spatiotemporal regulation and quantitative
Hiroaki Kajiho, Shin Morioka, Junko Sasaki, Takehiko Sasaki   +3 more
wiley   +1 more source

Distribution of the complex amplitude and intensity in a 3D scattering pattern formed by the optical system for an on-axis point object [PDF]

Компьютерная оптика, 2018
A quantitative evaluation of the depth of field of optical systems is given. Results of the calculation of the distribution of the complex amplitude and intensity in a three-dimensional scattering pattern formed by the optical system for an on-axis point
Sergey Koreshev, Denis Smorodinov, Oleg Nikanorov, Marina Alexeevna Frolova   +3 more
doaj   +1 more source