Results 241 to 250 of about 1,598,929 (274)

Depth of field extended scattering imaging by light field estimation

Optics Letters, 2018
Imaging through scattering media is challenging especially for three-dimensional scenarios. A lot of efforts have been made, but they suffer from tedious point spread function acquisition process or limited depth of field (DOF). In this Letter, a DOF extended scattering imaging method is proposed based on light field estimation.
Xin Jin, Zhouping Wang, Xiaoyu Wang, Qionghai Dai   +3 more
openaire   +2 more sources

Extended Depth of Field in Confocal Microscopy

Biophotonics Congress: Biomedical Optics Congress 2018 (Microscopy/Translational/Brain/OTS), 2018
We present a new type of confocal microscope that simultaneously image a specimen at four different depths, thus providing volumetric imaging at video rate. Our technique is an attractive tool for in vivo high-speed volumetric calcium imaging.
Amaury Badon, Jerome Mertz
openaire   +1 more source

Smart camera with extended depth of field

SPIE Proceedings, 2006
A smart camera is studied that combines the blurring logarithmic asphere lens and maximum entropy processing to extend the depth of field 10 times over that of a conventional lens and to provide near diffraction-limited performance. For this camera, a circularly symmetric logarithmic lens with radially varying focus length provides an image with ...
Wanli Chi, Nicholas George
openaire   +1 more source

Extended Depth-of-Field Intraocular Lenses

2019
Extended depth-of-focus (EDOF) optical profiles are a new optical design that is currently considered as an attractive alternative to accommodative and multifocal intraocular lenses (IOLs). Currently several optical principles might be utilized to indicate the physical mechanism of light bundling and are applied to EDOF IOLs—diffractive and/or ...
Jorge L. Alió, Andrzej Grzybowski, Piotr Kanclerz   +2 more
openaire   +1 more source

Integral imaging with extended depth of field

SPIE Proceedings, 2005
One of the main drawbacks on integral imaging systems is their limited depth of field. With the current state of sensor technology such limitation is imposed by the pixilated structure of cell detectors. So, depth of field only can be optimized by proper selection of system parameters. However, nowadays sensor technology experiments a fast development.
Manuel Martínez-Corral, Raúl Martínez-Cuenca, Genaro Saavedra, Bahram Javidi   +3 more
openaire   +1 more source

High Resolution - Extended Depth of Field Imaging

Frontiers in Optics, 2006
A pupil phase mask, designed for incoherently illuminated scenes, allows imaging with significantly increased depth of field, while maintaining acceptable resolution and color preservation. Color and contrast of the resulting images may be enhanced digitally.
Eyal Ben-Eliezer, Emanuel Marom, Naim Konforti, Leah Bar, Nahum Kiryati   +4 more
openaire   +1 more source

Extended Depth of Field through Unbalanced OPD

Frontiers in Optics 2008/Laser Science XXIV/Plasmonics and Metamaterials/Optical Fabrication and Testing, 2008
The depth of field of a conventional camera is extended simply by inserting an annular glass ring in front of the lens. The operating principle is explained and experimental results are shown.
Kaiqin Chu, Nicholas George, Wanli Chi
openaire   +1 more source

Extended Depth of Field: Axially Merging Foci

Frontiers in Optics, 2006
We present a family of phase-only zone plates with substructure rings. For extending the depth of field, the foci are merged axially. And the substructure rings follows sequences used in spread spectrum techniques.
Jorge Ojeda-Castañeda, A. Sauceda-Carvajal, J. E. A. Landgrave   +2 more
openaire   +1 more source

Extending depth of field in noisy light field photography

2017 IEEE 8th International Conference on Awareness Science and Technology (iCAST), 2017
A robust depth of field (DOF) extension algorithm was proposed based on the refocusing property of a light field photograph and the depth-from-defocus approach of multi-focus image fusing. The main techniques of the algorithm are depth estimation and all-in-focus image estimation. By making use of the redundancy of a light field photograph, we leverage
Shih-Shuo Tung, Hao-Chiang Shao, Wen-Liang Hwang   +2 more
openaire   +1 more source

Optical correlator with extended depth of field

Optics Communications, 1981
Abstract Preprocessing with a Fabry-Perot etalon in the image plane of an optical correlator is used to extend the depth of field of the instrument without reducing its selectivity. Experimental results are compared with the output of a classical correlator as well as with theory.
openaire   +1 more source