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A novel active and passive microwave remote sensing technique for measuring ocean surface wind vector

A novel active and passive microwave remote sensing techniqu...

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MTS/IEEE OCEANS, 2005

作者： Soisuvarn, Seubson Jones, W. Linwood Jelenak, Zorana Central Florida Remote Sensing Laboratory University of Central Florida Electrical and Computer Engineering Department Orlando FL 32816-2450 UCAR/NOAA/NESDIS ORA Camp Spring MD 20746

ISBN: (纸本)0933957343

This paper describes a novel technique of ocean surface vector wind measurement using active and passive microwave sensing from a satellite. For over a decade, satellite microwave scatterometers have remotely sensed ocean wind vector (speed and direction) by measuring ocean radar backscatter (sigma-0) at several different azimuth angles (looking forward and aft). Also, ocean wind speeds have been measured by conical scanning passive microwave radiometers looking either forward or aft. This paper combines these two techniques to obtain wind speed and direction from a conical scanning instrument that scans either forward or aft, which is extremely desirable from an instrument design and satellite accommodations standpoint. An overview of the active/passive wind vector algorithm is discussed, and wind vector retrievals are presented using microwave measurements from Japan's ADEOS-II satellite. These results are compared with wind vectors from the SeaWinds scatterometer.

关键词： Oceanography

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Oceanic rain rates from the WindSat radiometer

Oceanic rain rates from the WindSat radiometer

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2005 IEEE International Geoscience and remote sensing Symposium, IGARSS 2005

作者： Ahmad, Khalil Jones, W. Linwood Thomas-Stahle, Jody Kummerow, Christian D. Central Florida Remote Sensing Laboratory University of Central Florida Department of Electrical and Computer Engineering PO Box 162450 Orlando FL 32816 Department of Atmospheric Science Colorado State University Fort Collins CO 80523

ISBN: (纸本)0780390504

WindSat is a high precision, conical scanning microwave radiometer that was launched in January 2003 on the Coriolis satellite. The main objective of the WindSat mission is to demonstrate the "proof of concept" of measuring the ocean surface wind speed and direction using polarimetric microwave radiometry. However, in addition to wind vector, this five frequency, 22-channel radiometer is used to remotely sense other atmospheric and ocean surface environmental parameters. This paper presents the first utilization of WindSat to infer rain rates over the ocean. A description of the WindSat multi-channel, physically-based, rainfall retrieval algorithm is given. This preliminary algorithm is a modified version of the Advanced Microwave Scanning Radiometer (AMSR-E) oceanic rainfall algorithm developed at the Colorado Sate University. Examples of WindSat retrieved rain rates are presented for a variety of oceanic rain events. Further, a quantitative assessment of the WindSat rainfall retrieval accuracy is made through comparisons with rain measurements from the Tropical Rainfall Measuring Mission (TRMM) standard products. Results from statistical comparisons are presented using collocated rain observations obtained near-simultaneously by WindSat and the TRMM Microwave imager (TMI). © 2005 IEEE.

关键词： Radiometers

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Using a free-parts representation for visual speech recognition

Using a free-parts representation for visual speech recognit...

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Digital Imaging Computing: Techniques and Applications, DICTA 2005

作者： Lucey, Patrick Lucey, Simon Sridharan, Sridha Speech Audio Image and Video Research Laboratory Queensland University of Technology GPO Box 2424 Brisbane 4001 Australia Advanced Multimedia Processing Laboratory Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA 15213 United States

ISBN: (纸本)0769524672

Motivated by the success of free-parts based representations in face recognition, we have attempted to address some of the problems associated with applying such a philosophy to the task of speaker-independent visual speech recognition. A major problem with canonical area-based approaches in automatic visual speech recognition is the dependence these approaches have on locating and tracking the speaker's region of interest (ROI) correctly. By employing a free-parts representation, we assume that the position/structure of patches within the mouth image can be relaxed so they can "freely" move to varying extents, hence reducing the influence of the front-end effect. In this paper, we show that by using a free-parts representation we gain some robustness against the problem of ROI localisation and tracking compared to current area-based feature extraction techniques such as the discrete cosine transform (DCT). Also in this paper, we expose the importance of representation for the task of visual speech recognition highlighted by the poor results current representations yield. © 2005 IEEE.

关键词： Speech recognition

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IMPROVED SPEECH READING THROUGH A FREE-PARTS REPRESENTATION

IMPROVED SPEECH READING THROUGH A FREE-PARTS REPRESENTATION

引用

2005 International Conference on Auditory-Visual Speech processing, AVSP 2005

作者： Lucey, Simon Lucey, Patrick Advanced Multimedia Processing Laboratory Department of Electrical and Computer Engineering Carnegie Mellon University PittsburghPA15213 United States Speech Audio Image and Video Research Laboratory Queensland University of Technology GPO Box 2424 Brisbane4001 Australia

Motivated by the success of free-parts based representations in face recognition [1] we have attempted to address some of the problems associated with applying such a philosophy to the task of speaker-independent automatic speech reading. Hitherto, a major problem with canonical area-based approaches in automatic speech reading is the intrinsic lack of training observations due to the visual speech modality’s low sample rate and large variability in appearance. We believe a free-parts representation can overcome many of these limitations due to its natural ability to generalize by producing many observations from a single mouth image, whilst still preserving the ability to discriminate between various visual-speech units. This approach additionally requires a modification to traditional techniques employed for the estimation of hidden Markov Models (HMMs), whose resultant models we currently refer to as free-parts HMMs (FP-HMMs). Results will be presented on the CUAVE audiovisual speech database. © AVSP 2005. All rights reserved.

关键词： Hidden Markov models

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Optical flow-based tracking of deformable objects using a non-prior training active feature model 5th

Optical flow-based tracking of deformable objects using a no...

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5th Pacific Rim Conference on Multimedia, PCM 2004

作者： Kim, Sangjin Kang, Jinyoung Shin, Jeongho Lee, Seongwon Paik, Joonki Kang, Sangkyu Abidi, Besma Abidi, Mongi Image Processing and Intelligent Systems Laboratory Department of Image Engineering Graduate School of Advanced Imaging Science Multimedia and Film Chung-Ang University 221 Huksuk-Dong Tongjak-Ku Seoul156-756 Korea Republic of Imaging Robotics and Intelligent Systems Laboratory Department of Electrical and Computer Engineering The University of Tennessee KnoxvilleTN37996-2100 United States

ISBN: (纸本)9783540239857

This paper presents a feature point tracking algorithm using optical flow under the non-prior training active feature model (NPT-AFM) framework. The proposed algorithm mainly focuses on analysis of deformable objects, and provides real-time, robust tracking. The proposed object tracking procedure can be divided into two steps: (i) optical flow-based tracking of feature points and (ii) NPT-AFM for robust tracking. In order to handle occlusion problems in object tracking, feature points inside an object are estimated instead of its shape boundary of the conventional active contour model (ACM) or active shape model (ASM), and are updated as an element of the training set for the AFM. The proposed NPT-AFM framework enables the tracking of occluded objects in complicated background. Experimental results show that the proposed NPT-AFM-based algorithm can track deformable objects in real-time. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Optical flows

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Acousto-optics with MATLAB®

Acousto-optics with MATLAB&reg

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Acousto-optics and Photoacoustics

作者： Poon, Ting-Chung Kim, Taegeun Optical Image Processing Laboratory Bradley Department of Electrical and Computer Engineering Virginia Tech Blacksburg VA 24061 United States Department of Optical Engineering Sejong University 98 Kunja-Dong Kwangjin-Ku Seoul 143-747 Korea Republic of

MATLAB&reg is a widely accepted software tool routinely used in engineering, but not so much in applied optics and especially in acousto-optics. In this talk, we first explore the use of MATLAB&reg to solve so... 详细信息

MATLAB® is a widely accepted software tool routinely used in engineering, but not so much in applied optics and especially in acousto-optics. In this talk, we first explore the use of MATLAB® to solve some well-known examples in acousto-optics such as Bragg diffraction and Raman-Nath diffraction. After establishing the correctness of the MATLAB® approach, we then apply it to investigate image processing using acousto-optics and complete power transfer into the second and third Bragg order.

关键词： computer aided software engineering

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Ocean surface wind vector retrievals using active and passive microwave sensing on ADEOS-II

Ocean surface wind vector retrievals using active and passiv...

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IEEE International Symposium on Geoscience and remote sensing (IGARSS)

作者： S. Soisuvarn W.L. Jones T. Kasparis Central Florida Remote Sensing Laboratory Electrical and Computer Engineering Department University of Central Florida Orlando FL USA

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QuikSCAT Radiometer (QRad) rain rates for wind vector quality control

QuikSCAT Radiometer (QRad) rain rates for wind vector qualit...

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OCEANS

作者： K.A. Ahmad W. Linwood Jones T. Kasparis Central Florida Remote Sensing Laboratory Department of Electrical and Computer Engineering University of Central Florida Orlando FL USA

The Sea Winds scatterometer onboard the QuikSCAT satellite measures the ocean normalized radar cross section to infer the surface wind vector. In addition, SeaWinds simultaneously measures the polarized microwave brightness temperature of the ocean/atmosphere, and this passive microwave measurement capability is known as the QuikSCAT Radiometer (QRad). QRad brightness temperatures are used to infer instantaneous rain rates over oceans using a statistical retrieval algorithm that has been developed using collocated QRad brightness temperatures with TRMM Microwave imager (TMI) rain rate measurements. In this paper, QRad retrieved rain rate examples are presented and comparisons are made with independent near simultaneous rain observations including the TRMM 3B42RT data product. This near-real-time global precipitation data product combines all passive microwave with geostationary visible/infrared precipitation estimates in global 3-hour universal time windows. Results demonstrate that QRad rain measurements agree well with these independent microwave rain observations, which demonstrates the utility of using QRad rain retrievals as a "stand alone rain quality flag".

关键词： Rain Quality control Sea measurements Atmospheric measurements Microwave measurements Oceans Brightness temperature Microwave radiometry Radar measurements Satellite broadcasting

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Variational-based method to extract parametric shapes from images

Variational-based method to extract parametric shapes from i...

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International Conference on computer Vision (ICCV)

作者： M.T. El-Melegy N.H. Al-Ashwal A.A. Farag Electrical Engineering Department Assiut University Asyut Egypt Computer Vision and Image Processing Laboratory University of Louisville KY USA

In this paper, we propose a variational method to segment image objects, which have a given parametric shape based on a level-set formulation of the Mumford-Shah functional, and the shape parameters. We define an energy functional composed by two complementary terms. The first one detects object boundaries using a Chan-Vese-like method. The second term constrains the contour to find a shape compatible with the parametric shape. The segmentation of the object of interest is given by the minimum of our energy functional. This minimum is computed with the calculus of variation and the gradient descent method that provide a system of evolution equations solved with the well-known level set method. We focus in this paper on the parametric category of image linear objects. Applications of the proposed model are presented on synthetic and real images

关键词： Shape image segmentation Level set computer vision Focusing image processing Object detection Calculus Application software Equations

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A robust multi-view freehand three-dimensional ultrasound imaging system using volumetric registration

A robust multi-view freehand three-dimensional ultrasound im...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Honggang Yu M.S. Pattichis M.B. Goens Department of Electrical and Computer Engineering Image and Video Processing and Communications Laboratory USA Childrens Hospital Heart Center University of New Mexico Albuquerque NM USA

In this paper, we describe a freehand, three-dimensional ultrasound imaging system. The system uses an electromagnetic position and orientation measurement device to capture two-dimensional ultrasound images at arbitrary planar orientations in space. For robust performance, we use a novel electromagnetic interference detection algorithm that can be used to estimate the probability density function of position and orientation measurement errors. Another important contribution of the proposed system is its ability to reconstruct from multiple standard views. The multi-view reconstruction procedure results in significant reduction in reconstruction error. The system uses object-based 3D volume registration, allowing for arbitrary rigid object movements in inter-view acquisition. The proposed system has been validated on simulated data and a physical, 3D ultrasound calibration phantom. Quantitative experimental results demonstrate the effectiveness of the 3D registration system, and a significant reduction in the mean-squared error via the use of the proposed multi-view reconstruction method.

关键词： Ultrasonic imaging Robustness image reconstruction Position measurement Electromagnetic devices Extraterrestrial measurements Electromagnetic interference Detection algorithms Probability density function Calibration

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