Atmospheric and Ocean Optics, Remote Sensing, Radiometry, IR Systems, UV and X-ray Applications, Adaptive Optics http://scitation.aip.org/ Atmospheric and Ocean Optics, Remote Sensing, Radiometry, IR Systems, UV and X-ray Applications, Adaptive Optics Generalized multiple kernel framework for multiclass geospatial objects detection in high-resolution remote sensing images http://link.aip.org/link/?JOE/51/016203/1&agg=rss Xiangjuan Li, Xian Sun, Hao Sun, Yu Li, and Hongqi Wang<br/> Multiclass geospatial objects detection within complex environments is a challenging problem in remote-sensing areas. In this paper we propose a novel, generalized kernel-based learning framework for the purpose of enhanced object detection. There are two novel areas. (1) Multisource information, in ... [Opt. Eng. 51, 016203 (2012)] published Fri Feb 10, 2012. Hyperspectral matched filter with false-alarm mitigation http://link.aip.org/link/?JOE/51/016202/1&agg=rss Robert S. DiPietro, Dimitris G. Manolakis, Ronald B. Lockwood, Thomas Cooley, and John Jacobson<br/> One of the fundamental challenges for a hyperspectral imaging surveillance system is the detection of sub-pixel objects in background clutter. The background surrounding the object, which acts as interference, provides the major obstacle to successful detection. One algorithm that is widely used in ... [Opt. Eng. 51, 016202 (2012)] published Fri Feb 10, 2012. Simulation of practical single-pixel wire-grid polarizers for superpixel stokes vector imaging arrays http://link.aip.org/link/?JOE/51/016201/1&agg=rss Alan D. Raisanen, Michael D. Presnar, Zoran Ninkov, Kenneth Fourspring, Lingfei Meng et al.<br/> An optical tracking sensor that produces images containing the state of polarization of each pixel can be implemented using individual wire-grid micropolarizers on each detector element of a solid-state focal plane array. These sensors can significantly improve identification and tracking of various ... [Opt. Eng. 51, 016201 (2012)] published Tue Feb 7, 2012. Super-resolution land-cover mapping based on the selective endmember spectral mixture model in hyperspectral imagery http://link.aip.org/link/?JOE/50/126201/1&agg=rss Ke Wu, Liangpei Zhang, Ruiqing Niu, Bo Du, and Yi Wang<br/> Hyperspectral imagery contains a large number of mixed pixels, which limits its utility. Super-resolution mapping is a potential solution to this problem, designed to use the proportion of land covers to obtain a sharpened thematic map with higher resolution. Endmember is a fundamental variable in t ... [Opt. Eng. 50, 126201 (2011)] published Mon Nov 28, 2011. Ultraviolet laser generation by frequency doubling of focused Gaussian beam http://link.aip.org/link/?JOE/50/126501/1&agg=rss Hu Miao, Zhang Hui, An Ru-De, and Tang Yong-Pan<br/> A new theory for describing the ultraviolet (UV) laser generation mechanism by frequency doubling of focused Gaussian beam in nonlinear crystal was presented. The nonlinear crystal used for UV laser generation, such as beta-barium borate (BBO), has dramatically small phase matching acceptance angles ... [Opt. Eng. 50, 126501 (2011)] published Mon Nov 21, 2011. Pseudorandom noise codebased technique for thin-cloud discrimination with CO and O absorption measurements http://link.aip.org/link/?JOE/50/126002/1&agg=rss Joel F. Campbell, Narasimha S. Prasad, and Michael A. Flood<br/> NASA Langley Research Center is working on a continuous wave (cw) laser-based remote sensing scheme for the detection of CO and O from space-based platforms suitable for an active sensing of CO emissions over nights, days, and seasons (ASCENDS) mission. ASCENDS is a future space-based mission to det ... [Opt. Eng. 50, 126002 (2011)] published Fri Nov 18, 2011. On linear and circular depolarization LIDAR signatures in remote sensing of bioaerosols: experimental validation of the Mueller matrix for randomly oriented particles http://link.aip.org/link/?JOE/50/126001/1&agg=rss Gilles Roy, Xiaoying Cao, and Robert Bernier<br/> Strong experimental data supporting the theoretical relationship between linear and circular depolarizations for randomly oriented particles are presented. The analysis of the data leads to the first experimental validation of the theoretical representation of the scattering Mueller matrix as having ... [Opt. Eng. 50, 126001 (2011)] published Thu Nov 17, 2011. Countermeasure effectiveness against a man-portable air-defense system containing a two-color spinscan infrared seeker http://link.aip.org/link/?JOE/50/126401/1&agg=rss James Jackman, Mark Richardson, Brian Butters, and Roy Walmsley<br/> Man-portable air-defense (MANPAD) systems have developed sophisticated counter-countermeasures (CCM) to try and defeat any expendable countermeasure that is deployed by an aircraft. One of these is a seeker that is able to detect in two different parts of the electromagnetic spectrum. Termed two-col ... [Opt. Eng. 50, 126401 (2011)] published Wed Nov 16, 2011. Performance of a flexible optical aberration generator http://link.aip.org/link/?JOE/50/116601/1&agg=rss Christopher C. Wilcox, Freddie Santiago, Ty Martinez, Jonathan R. Andrews, Sergio R. Restaino et al.<br/> The Naval Research Laboratory has developed a method for simulating atmospheric turbulence and a testbed that simulates its aberrations using a liquid crystal (LC) spatial light modulator (SLM). This testbed allows the simulation of so-called atmospheric seeing conditions ranging from very poor to v ... [Opt. Eng. 50, 116601 (2011)] published Wed Nov 2, 2011. Metrological comparison of terrestrial laser scanning systems Riegl LMS Z390i and Trimble GX http://link.aip.org/link/?JOE/50/116201/1&agg=rss Higinio Gonzalez-Jorge, Pablo Rodriguez-Gonzalvez, Diego Gonzalez-Aguilera, and Maria Varela-Gonzalez<br/> A low cost physical artifact with traceability to the national standard meter is used for the metrological comparison of two terrestrial laser scanning systems: Riegl LMS Z390i and Trimble GX. The artifact is based on five spheres equidistantly situated and seven cubes of different dimensions. Accu ... [Opt. Eng. 50, 116201 (2011)] published Wed Oct 26, 2011. Tracking a large number of closely spaced objects based on the particle probability hypothesis density filter via optical sensor http://link.aip.org/link/?JOE/50/116401/1&agg=rss Liangkui Lin, Hui Xu, Wei An, Weidong Sheng, and Dan Xu<br/> This paper presents a novel approach to tracking a large number of closely spaced objects (CSO) in image sequences that is based on the particle probability hypothesis density (PHD) filter and multiassignment data association. First, the particle PHD filter is adopted to eliminate most of the clutte ... [Opt. Eng. 50, 116401 (2011)] published Wed Oct 26, 2011. Differential deposition technique for figure corrections in grazing-incidence x-ray optics http://link.aip.org/link/?JOE/50/106501/1&agg=rss Kiranmayee Kilaru, Brian D. Ramsey, Mikhail V. Gubarev, and Don A. Gregory<br/> A differential deposition technique was investigated as a way to minimize axial figure errors in full-shell, grazing-incidence, reflective x-ray optics. These types of optics use a combination of off-axis conic segmentshyperbolic, parabolic, and/or elliptical, to reflect and image x-rays. Several su ... [Opt. Eng. 50, 106501 (2011)] published Wed Sep 28, 2011. Data consistency conditionbased beam-hardening correction http://link.aip.org/link/?JOE/50/076501/1&agg=rss Shaojie Tang, Xuanqin Mou, Qiong Xu, Yanbo Zhang, James Bennett et al.<br/> In medical x ray computed tomography (CT) imaging devices, the x ray tube usually emits a polychromatic spectrum of photons resulting in beam-hardening artifacts in the reconstructed images. The bone-correction method has been widely adopted to compensate for beam-hardening artifacts. However, its c ... [Opt. Eng. 50, 076501 (2011)] published Mon Jul 25, 2011. Lithology intelligent identification using support vector machine and adaptive cellular automata in multispectral remote sensing image http://link.aip.org/link/?JOE/50/076201/1&agg=rss Xianmin Wang, Ruiqing Niu, and Ke Wu<br/> Remote sensing provides a new idea and an advanced method for lithology identification, but lithology identification by remote sensing is quite difficult because 1. the disciplines of lithology identification in a concrete region are often quite different from the experts' experience; 2. in the regi ... [Opt. Eng. 50, 076201 (2011)] published Wed Jul 6, 2011. Bearings-only tracking with iterated extended risk sensitive filter http://link.aip.org/link/?JOE/50/066401/1&agg=rss Munisamy Srinivasan<br/> This paper concerns the application of an iterated extended risk sensitive filter (IERSF) to target tracking problems. The relative merits of IERSF vis-a-vis the extended risk sensitive filter (ERSF) for a bearings-only tracking problem using root mean square error (RMSE) and robustness with uncerta ... [Opt. Eng. 50, 066401 (2011)] published Fri Jul 1, 2011. Fourier transform hyperspectral imaging polarimeter for remote sensing http://link.aip.org/link/?JOE/50/066201/1&agg=rss Chunmin Zhang, Haiying Wu, and Jie Li<br/> Theory and simulations of a novel hyperspectral imaging polarimeter for remote sensing are presented. The spectropolarimeter is formed by cascading two laser servocontrol modified wave plates (MWP) and a polarization interference imaging spectrometer (PIIS). Using the phase modulation of the MWPs, t ... [Opt. Eng. 50, 066201 (2011)] published Thu Jun 9, 2011. Efficient extreme ultraviolet transmission gratings for plasma diagnostics http://link.aip.org/link/?JOE/50/066501/1&agg=rss Christoph Braig, Peter Predehl, and Ernst-Bernhard Kley<br/> We report on a theoretical study of free-standing phase transmission gratings for high-resolution extreme ultraviolet (EUV) and soft x-ray spectroscopy and investigate their properties. Designed for wavelengths between about 2 and 40 nm, the devices may provide a first order diffraction efficiency b ... [Opt. Eng. 50, 066501 (2011)] published Thu Jun 9, 2011. Reanalysis of turbulence effects on short-exposure passive imaging http://link.aip.org/link/?JOE/50/016001/1&agg=rss David H. Tofsted<br/> The standard method for modeling the atmospheric short-exposure modulation transfer function (MTF) is due to Fried. This method involves evaluating the impact of amplitude and phase modulations of the propagating wavefront after the removal of the mean wavefront tilt. This tilt is determined by a le ... [Opt. Eng. 50, 016001 (2011)] published Wed Jan 26, 2011. Study on phase function in Monte Carlo transmission characteristics of poly-disperse aerosol http://link.aip.org/link/?JOE/50/016002/1&agg=rss Lu Bai, Zhen-sen Wu, Shuang-qing Tang, Ming Li, Pin-hua Xie et al.<br/> HenyeyGreenstein (H-G) phase function is typically used as an approximation to Mie phase function and its shortcomings have been discussed in numerous papers. But the judicious criterion of when the H-G phase function would be valid is still ambiguous. In this paper, we use the direct sample phase f ... [Opt. Eng. 50, 016002 (2011)] published Wed Jan 26, 2011. Determining the complex index of refraction of an unknown object using turbulence-degraded polarimetric imagery http://link.aip.org/link/?JOE/49/126201/1&agg=rss Milo W. Hyde IV, Jason D. Schmidt, Michael J. Havrilla, and Stephen C. Cain<br/> A novel index-of-refraction material-characterization technique using passive polarimetric imagery degraded by atmospheric turbulence is presented. The method uses a variant of the LeMaster and Cain [J. Opt. Soc. Am. A 25(9), 21702176 (2008)] blind-deconvolution algorithm to recover the true object ... [Opt. Eng. 49, 126201 (2010)] published Tue Dec 21, 2010. Extended use of two crossed Babinet compensators for wavefront sensing in adaptive optics http://link.aip.org/link/?JOE/49/126601/1&agg=rss Lancelot Paul and Ajay Kumar Saxena<br/> An extended use of two crossed Babinet compensators as a wavefront sensor for adaptive optics applications is proposed. This method is based on the lateral shearing interferometry technique in two directions. A single record of the fringes in a pupil plane provides the information about the wavefron ... [Opt. Eng. 49, 126601 (2010)] published Thu Dec 16, 2010.