Results 21 to 30 of about 763,372 (283)
Optical approach of a hypercatadioptric system depth of field [PDF]
, 2010 A catadioptric system is composed of a mirror and a perspective camera. Since the mirror is curved and the distance between the mirror and the camera is short, some parts of the panoramic image keep blurred.
Zenou, Emmanuel, Zhang, Siyuan
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Video-rate 3D Particle Tracking with Extended Depth-of-field in Thick Biological Samples [PDF]
, 2017 We present a single-aperture 3D particle localisation and tracking technique with a vastly increased depth-of-field without compromising optical resolution and throughput. Flow measurements in a FEP capillary and a zebrafish blood vessel are demonstrated
Carles, Guillem +5 more
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Indian Journal of Ophthalmology, 2021 Purpose: To study the relationship between the amplitude of accommodation (AA) measured by the Royal Air Force (RAF) rule and near addition (NA) prescribed in presbyopic patients to assess how far practice is different from theoretical recommendations ...
Susmi Deepu +5 more
doaj +1 more source
Subjective method of refractometry and depth of focus
Journal of Optometry, 2012 Purpose: To study the impact of the depth of focus on subjective refraction and distribution of myopic and hyperopic refractions. Methods: A total of 450 eyes of 305 subjects in the age range of 23–34 years were recruited for the study. A distribution of
Nikolai M. Sergienko +2 more
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Time-sequential Pipelined Imaging with Wavefront Coding and Super Resolution [PDF]
, 2017 Wavefront coding has long offered the prospect of mitigating optical aberrations and extended depth of field, but image quality and noise performance are inevitably reduced. We report on progress in the use of agile encoding and pipelined fusion of image
Bradburn +6 more
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Optical ptychography with extended depth of field [PDF]
, 2017 Ptychography is an increasingly popular phase imaging technique. However, like any imaging technique it has a depth of field that limits the volume of a thick specimen that can be imaged in focus. Here, we have proposed to extend the depth of field using
Andrew Maiden +3 more
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Trade-Off Asymmetric Profile for Extended-Depth-of-Focus Ocular Lens
Photonics, 2022 We explore the possibility of extending the depth of focus of an imaging lens with an asymmetric quartic phase-mask, while keeping the aberration within a relatively low level.
Lenny A. Romero +2 more
doaj +1 more source
Extending AMCW lidar depth-of-field using a coded aperture [PDF]
, 2011 By augmenting a high resolution full-field Amplitude Modulated Continuous Wave lidar system with a coded aperture, we show that depth-of-field can be extended using explicit, albeit blurred, range data to determine PSF scale. Because complex domain range-
Cree, Michael J. +2 more
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Highlighted depth-of-field photography: Shining light on focus [PDF]
, 2011 We present a photographic method to enhance intensity differences between objects at varying distances from the focal plane. By combining a unique capture procedure with simple image processing techniques, the detected brightness of an object is ...
Horstmeyer, Roarke William +3 more
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Shaded-Mask Filtering for Extended Depth-of-Field Microscopy [PDF]
, 2013 This paper proposes a new spatial filtering approach for increasing the depth-of-field (DOF) of imaging systems, which is very useful for obtaining sharp images for a wide range of axial positions of the object.
Calatayud, Arnau +4 more
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