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Journal of the Optical Society of America. A, Optics, Image Science, and Vision

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https://www.readbyqxmd.com/read/28157857/electromagnetic-induction-holography-imaging-for-stroke-detection
#1
Lulu Wang
This paper presents the application of the electromagnetic induction holography (EMIH) approach to imaging the electromagnetic activity of the brain, with a particular focus on stroke detection. An integral equation formulation is presented to describe the scattered magnetic field from the distribution of optically small dielectric and magnetic objects of arbitrary shapes adsorbed onto a planar electromagnetic substrate. A numerical computer model was developed in a MATLAB environment to validate the theory...
February 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28157856/online-multi-object-tracking-with-efficient-track-drift-and-fragmentation-handling
#2
Jaeyong Ju, Daehun Kim, Bonhwa Ku, David K Han, Hanseok Ko
This paper addresses the problem of multi-object tracking in complex scenes by a single, static, uncalibrated camera. Tracking-by-detection is a widely used approach for multi-object tracking. Challenges still remain in complex scenes, however, when this approach has to deal with occlusions, unreliable detections (e.g., inaccurate position/size, false positives, or false negatives), and sudden object motion/appearance changes, among other issues. To handle these problems, this paper presents a novel online multi-object tracking method, which can be fully applied to real-time applications...
February 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28157855/congratulations-and-changes-to-the-josa-a-team-editorial
#3
P Scott Carney
Editor-in-Chief P. Scott Carney introduces new Topical Editors Antigone Marino and Alessandro Rizzi.
February 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28157854/time-domain-electromagnetic-scattering-by-a-sphere-in-uniform-translational-motion
#4
Timothy J Garner, Akhlesh Lakhtakia, James K Breakall, Craig F Bohren
Scattering by a uniformly translating sphere of a pulse that modulates the amplitude of a linearly polarized plane wave was formulated using the frame-hopping method involving a laboratory inertial reference frame and the sphere's comoving inertial reference frame. The incident signal was defined in the laboratory frame and transformed to the comoving frame with the Lorentz transformation, thereby altering the incident signal's spectrum, direction of propagation of the carrier plane wave, and the direction of the incident electric field, depending on the sphere's velocity...
February 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28157853/long-period-fiber-gratings-with-off-resonance-spectral-response-based-on-mechanical-oscillations
#5
Shir Shahal, Avi Klein, Gilad Masri, Hamootal Duadi, Moti Fridman
We present long period fiber gratings with off-resonance spectral response. Our long period fiber gratings are created by the periodic structure of large perturbations in the fiber diameter. These perturbations result in unique spectral response, even in off-resonance frequencies. Writing these long period fiber gratings is based on utilizing the mechanical vibrations of tapered fibers during the tapering process. This writing method is simple and robust; it has high efficiency, high reproducibility, and low polarization dependency; and it enables real-time tunability of the periodicity, efficiency, and length of the grating...
February 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28157852/expression-of-the-degree-of-polarization-based-on-the-geometrical-optics-pbrdf-model
#6
Kai Wang, Jingping Zhu, Hong Liu, Bingzheng Du
An expression of the degree of polarization (DOP) based on the geometrical optics polarimetric bidirectional reflectance distribution function model is presented. In this expression, the DOP is related to the surface roughness and decreases at different reflection angles because diffuse reflection is taken into consideration. A shadowing/masking function introduced into the specular reflection expression makes the DOP values decrease as the angle of incidence or observation approaches grazing. Different kinds of materials were measured to validate the accuracy of this DOP expression...
February 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28157851/cp-tensor-based-compression-of-hyperspectral-images
#7
Leyuan Fang, Nanjun He, Hui Lin
In this paper, an effective CANDECOMP/PARAFAC tensor-based compression (CPTBC) approach is proposed for on-ground hyperspectral images (HSIs). By considering the observed HSI cube as a whole three-order tensor, the proposed CPTBC method utilizes the CANDECOMP/PARAFAC tensor decomposition to decompose the original HSI data into the sum of R rank-1 tensors, which can simultaneously exploit both the spatial and spectral information of HSIs. Specifically, compared with the original HSI data, the R rank-1 tensors have fewer non-zero entries...
February 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28157850/impact-of-a-detector-dead-time-in-phase-resolved-doppler-analysis-using-spectral-domain-optical-coherence-tomography
#8
Julia Walther, Edmund Koch
For any oblique sample movement containing a transverse velocity component, the commonly used linear relationship between the phase shift and the axial velocity component is erroneous for spectrometer-based optical coherence tomography (spectral domain OCT, SD-OCT). We recently proposed a new Doppler model that assumes a continuous integration of the photocurrent. In this research, we extend the model for detectors with a shutter control by taking detector dead time into account. We present the new relation between phase shift and oblique sample displacement as well as the correlation of the phases of consecutive depth scans, in dependency on the detector dead times ranging from 5% to 90%, as numerically calculated universal contour plots, which are valid for any center wavelength and sample beam size...
February 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28157849/2%C3%A2-%C3%A3-%C3%A2-1d-crossed-strongly-modulated-gratings-for-polarization-independent-tunable-narrowband-transmission-filters
#9
A-L Fehrembach, K Sharshavina, F Lemarchand, E Popov, A Monmayrant, P Arguel, O Gauthier-Lafaye
We design a narrowband polarization independent transmission guided mode resonance filter whose center wavelength is tunable with respect to the angle of incidence. The device is composed of two identical structures assembled back to back. Each half structure is a dielectric multilayer stack in which a grating is engraved. This so-called 2×1D crossed gratings component has already been demonstrated for reflection filtering [Opt. Lett.36, 1662 (2011)OPLEDP0146-959210.1364/OL.36.001662; Opt. Lett.39, 6038 (2014)OPLEDP0146-959210...
February 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28157848/local-normal-vector-field-formulation-for-periodic-scattering-problems-formulated-in-the-spectral-domain
#10
M C van Beurden, I D Setija
We present two adapted formulations, one tailored to isotropic media and one for general anisotropic media, of the normal vector field framework previously introduced to improve convergence near arbitrarily shaped material interfaces in spectral simulation methods for periodic scattering geometries. The adapted formulations enable the definition and generation of the normal vector fields to be confined to a region of prolongation that includes the material interfaces but is otherwise limited. This allows for a more flexible application of geometrical transformations like rotation and translation per scattering object in the unit cell...
February 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28157847/monitor-brightness-changes-under-a-wide-range-of-surround-conditions
#11
Ye Seul Baek, Youngshin Kwak, Seung-Ok Park
Display brightness data were collected under a wide range of surround conditions. A 24 in. (60.96 cm) LCD display was used to generate color stimuli, and a 107 in. (271.78 cm) two-dimensional illuminator was used to generate various surround conditions. The brightness values of the display under 89 monitor-surround-luminance combinations were collected from 10 or 24 observers. The surround ratio, S<sub>R</sub>, i.e., the luminance ratio between the surround and the monitor, varied from 0 to 90. Based on the collected brightness data, we propose a new c value as the log function of the surround ratio, S<sub>R</sub>, to improve the performance of the CIECAM02 brightness predictor Q...
February 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28157846/remote-classification-from-an-airborne-camera-using-image-super-resolution
#12
Matthew Woods, Aggelos Katsaggelos
The image processing technique known as super-resolution (SR), which attempts to increase the effective pixel sampling density of a digital imager, has gained rapid popularity over the last decade. The majority of literature focuses on its ability to provide results that are visually pleasing to a human observer. In this paper, we instead examine the ability of SR to improve the resolution-critical capability of an imaging system to perform a classification task from a remote location, specifically from an airborne camera...
February 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28157845/data-driven-background-representation-method-to-video-surveillance
#13
Zhihui Li, Yingji Xia, Zhaowei Qu
Background subtraction is the fundamental step of moving object detection. As current methods use specific data-based or data learning methods to represent background, this will induce the problem of model distortion while the scenarios cannot meet their assumptions or model conditions. A novel data-driven framework is proposed to represent the background using the intrinsic characteristics of the background. In the framework, the model-free adaptive control method is used as an instance to analyze the background by its status of the nearest time instants, and linearize them dynamically from a pure data perspective...
February 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28157844/discreteness-of-the-real-point-emitters-as-a-physical-condition-for-diffraction
#14
Román Castañeda
The discreteness of the zeroth-order class of the spectrum of classes of point emitters is shown as a necessary and sufficient physical condition for describing diffraction from the aperture plane to the far field. Although it does not contradict the continuity requirement of the cross-spectral density, it points out that this mathematical requirement is physically redundant. This feature gives new insight on the understanding of diffraction as well as novel tools for design and development of efficient non-paraxial propagation algorithms...
February 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28157843/perifoveal-s-cone-and-rod-driven-temporal-contrast-sensitivities-at-different-retinal-illuminances
#15
Cord Huchzermeyer, Jan Kremers
We evaluated a technique for measuring temporal contrast sensitivities to sine-wave modulation driven by S-cones and rods in the perifovea using triple silent substitution. Isolating stimuli for S-cones and rods were created using an eight-channel, four-primary LED stimulator that has been validated before. Sensitivities were measured at 10 different temporal frequencies between 1 and 28 Hz in three normal observers at 14 different retinal illuminances between 0.07 and 587 photopic troland (phot Td) and at three different retinal illuminances over the same range in one S-cone monochromat...
February 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28157842/characterization-design-and-optimization-of-a-two-pass-twisted-nematic-liquid-crystal-spatial-light-modulator-system-for-arbitrary-complex-modulation
#16
A J Macfaden, T D Wilkinson
Arbitrary two-dimensional complex modulation of an optical field is a powerful tool for coherent optical systems. No single spatial light modulator (SLM) offers true arbitrary complex modulation, but they can be combined in order to achieve this. In this work, two sides of a twisted nematic (TN) liquid crystal SLM are used sequentially to implement different arbitrary modulation schemes. In order to fully explore and exploit the rich modulation behavior offered by a TN device, a generalized Jones matrix approach is used...
February 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28157841/generalized-kubelka-munk-approximation-for-multiple-scattering-of-polarized-light
#17
Christopher Sandoval, Arnold D Kim
We introduce a new model for multiple scattering of polarized light by statistically isotropic and mirror-symmetric particles, which we call the generalized Kubelka-Munk (gKM) approximation. It is obtained through a linear transformation of the system of equations resulting from applying the double spherical harmonics approximation of order one to the vector radiative transfer equation (vRTE). The result is a 32×32 system of differential equations that is much simpler than the vRTE. We compare numerical solutions of the vRTE with the gKM approximation for the problem in which a plane wave is normally incident on a plane-parallel slab composed of a uniform absorbing and scattering medium...
February 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28157840/optical-second-harmonic-images-of-sacran-megamolecule-aggregates
#18
Yue Zhao, Khuat Thi Thu Hien, Goro Mizutani, Harvey N Rutt, Kittima Amornwachirabodee, Maiko Okajima, Tatsuo Kaneko
We have detected a second-order nonlinear optical response from aggregates of the ampholytic megamolecular polysaccharide sacran extracted from cyanobacterial biomaterials by using optical second-harmonic-generation (SHG) microscopy. The SHG images of sacran cotton-like lump, fibers, and cast films showed SHG intensity microspots of several tens of micrometers in size. The dependence of the SHG spot intensity on an excitation light polarization angle was observed to illustrate sacran molecular orientation in these microdomains...
February 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28059233/cytopathological-image-analysis-using-deep-learning-networks-in-microfluidic-microscopy
#19
G Gopakumar, K Hari Babu, Deepak Mishra, Sai Siva Gorthi, Gorthi R K Sai Subrahmanyam
Cytopathologic testing is one of the most critical steps in the diagnosis of diseases, including cancer. However, the task is laborious and demands skill. Associated high cost and low throughput drew considerable interest in automating the testing process. Several neural network architectures were designed to provide human expertise to machines. In this paper, we explore and propose the feasibility of using deep-learning networks for cytopathologic analysis by performing the classification of three important unlabeled, unstained leukemia cell lines (K562, MOLT, and HL60)...
January 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/28059232/analysis-of-the-average-photon-path-length-between-two-consecutive-reflections-from-the-cavity-walls
#20
Lazo M Manojlović
In this paper a general theoretical analysis of the average photon path length between two consecutive photon reflections from the cavity walls has been presented. The presented analysis relies only on the energy conservation law and the assumption of the uniform photon distribution within the cavity volume. The obtained general result coincides with the solution previously obtained but under more stringent conditions.
January 1, 2017: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
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