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Extended depth of field by colored apodization
Optics Letters, 2011We describe an approach to achieving extended depth of field for a camera system based on reducing the aperture of the blue channel of a three-color camera by apodizing the lens with a yellow-colored filter. The resulting improvement in depth of field for the blue channel allows red and green channels to be digitally postprocessed for improved ...
Andrew, Kay +2 more
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Extended depth-of-field imaging and ranging in a snapshot [PDF]
Optica, 2014 Traditional approaches to imaging require that an increase in depth of field is associated with a reduction in numerical aperture, and hence with a reduction in resolution and optical throughput.
Guillem Carles +2 more
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Extended depth-of-field microscopy
SPIE Proceedings, 2010In this paper, we present details of a scanning two-photon fluorescence microscope we have built with a nearisotropic scan rate. This means that the focal spot can be scanned at high speed along any direction in the specimen, without introducing systematic aberrations.
Christopher Smith +4 more
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Extended Depth of Field in Microscope
Optics in the Life Sciences, 2013A cubic phase mask is used in an infinity microscope objective to extend depth of field. The mask is placed between the objective and tube lens, so that neither objective nor tube lens needs redesigning.
Tingyu Zhao, Guoqiang Li
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Multiple-frame photography for extended depth of field
Applied Optics, 2013For extending the depth of field, we analyze the result of superimposing several snapshots, which are taken while changing the amount of focus error, at full pupil aperture. We unveil the use of a varifocal lens for controlling the amount of focus error, without modifying either the lateral magnification or light throughput.
Jorge, Ojeda-Castañeda +2 more
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Digitized optical microscopy with extended depth of field
Applied Optics, 1989Partial information about a 3-D object, such as a stereoscopic pair of projections, is sometimes more desirable than the whole 3-D information. We demonstrate how to (1) synthesize a clear projection of a small complex object from a succession of digitized images obtained by moving the object stepwise through the focal plane, (2) synthesize a clear ...
K, Itoh, A, Hayashi, Y, Ichioka
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Pattern image enhancement by extended depth of field
Microelectronics Reliability, 2014Abstract Most optical defect localization techniques such as dynamic laser stimulation or photon emission microscopy require a pattern image of the device to be taken. The main purpose is for device navigation, but it also enables the analyst to identify the location of the monitored activity by superimposing it onto the pattern image.
Chef, Samuel +5 more
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Smart camera with extended depth of field
SPIE Proceedings, 2006A 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
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Extended Depth of Field in Confocal Microscopy
Biophotonics Congress: Biomedical Optics Congress 2018 (Microscopy/Translational/Brain/OTS), 2018We 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
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Integral imaging with extended depth of field
SPIE Proceedings, 2005One 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 +3 more
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