Results 231 to 240 of about 168,029,963 (264)

Optical microscopy with extended depth of field

Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences, 1983
Abstract A method is described that allows the depth of field in optical microscopy to be extended, in principle without limit, while high-resolution, diffraction-limited imaging is retained. Experimentally, an extension of more than two orders of magnitude has been achieved.
C. J. R. Sheppard, D. K. Hamilton, I. J. Cox   +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

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

Polynomial phase masks for extending the depth of field of a microscope

Applied Optics, 2008
A polynomial phase mask is designed and fabricated for enhancing the depth of field of a microscope by more than tenfold. A generic polynomial of degree 31 that consists of 16 odd power terms is optimized by simulated annealing with a realistic average modulation transfer function (MTF) iteratively set as the target MTF.
Nicolas, Caron, Yunlong, Sheng
openaire   +2 more sources

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

The influence of chromatic components on extended depth of field imaging

Microscopy Research and Technique, 2009
AbstractThe analysis of variance is one of the most commonly used algorithms for detecting focalized zones in digital images and is an entry point to extended focalization techniques beyond those established by optical laws. This article analyses the dependence of the red, green, and blue (RGB) and lightness, hue, and saturation (LHS) components when ...
Javier, Navas, Joaquín, Martín
openaire   +2 more sources

Experimental realization of an imaging system with an extended depth of field

Applied Optics, 2005
We describe the experimental realization of an all-optical imaging system with an extended depth of field (DOF). The core of the system is a phase mask consisting of 16 Fresnel lenses (FLs) that are spatially multiplexed and mutually exclusive. Because each FL, in tandem with the primary lens, is designed to produce a sharp image for a specific object ...
Eyal, Ben-Eliezer, Emanuel, Marom, Naim, Konforti, Zeev, Zalevsky   +3 more
openaire   +2 more sources

Extended depth of field method with a designed diffraction optical element based on multi-depth fusion and end-to-end optimization

Optics Communications, 2022
Xinzhu Sang, Binbin Yan, Xinhui Xie
exaly  

Extended depth of field and aberration control for inexpensive digital microscope systems

Optics Express, 1999
Edward R Dowski, W Thomas Cathey
exaly  

Diffusion coded photography for extended depth of field

ACM Transactions on Graphics, 2010
Oliver S Cossairt, Changyin Zhou, Shree K. Nayar   +2 more
exaly