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Annual Northeast Bioengineering Conference

作者： D.M. Wootton A. Guez P. Vaidyanathan D. Avinash J.R. Stablum J.M. McDonough J.K. Udupa R. Arens Department of Mechanical Engineering and Mechanics Drexel University Philadelphia USA Department of Electrical and Computer Engineering Drexel University Philadelphia USA School of Biomedical Engineering Drexel University School of Biomedical Engineering Drexel University Philadelphia USA Department Dept. of Pulmonary Medicine Children's Hospital of Pennsylvania Philadelphia PA USA Medical Image Processing Group Drexel University Philadelphia PA USA Medical Image Processing Group University of Pennsylvania

Obstructive sleep apnea syndrome (OSAS) in children is correlated to anatomy of the upper airway. Segmented magnetic resonance images of airways from ten OSAS and ten matched control children were used to generate computer flow models. Steady turbulent axisymmetric flow models were solved at peak flow rate to estimate the effect of restricted airway area on pressure drop and resistance. OSAS patients had significantly higher pressure drop and resistance than controls. The magnitude of pressure drop was similar to reported critical airway closure pressures. A subset of OSAS patients had pressure drop and flow resistance similar to controls. Flow modeling may be a useful method to assess the role of anatomy in OSAS.

关键词： Sleep apnea Pediatrics Anatomy image segmentation Immune system Fluid flow control Pressure control Computational fluid dynamics image processing Magnetic resonance imaging

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New class of impulsive noise reduction filters based on kernel density estimation

New class of impulsive noise reduction filters based on kern...

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2003 IEEE International Conference on Accoustics, Speech, and Signal processing

作者： Smòlka, B. Plataniotis, K.N. Lukac, R. Venetsanopoulos, A.N. Edward S. Rogers Sr. Dept. Elec. E. University of Toronto 10 King's College Road Toronto Ont. M5S 3G4 Canada Slovak Image Processing Center Jarkova 343 049 25 Dobsina Slovakia Fac. of Appl. Sci. and Engineering University of Toronto 35 St. George Street Toronto Ont. M5S 3G4 Canada

This paper presents a new filtering scheme for the removal of impulsive noise in color images. It is based on estimating the probability density function for color pixels in a filter window by means of the kernel density estimation method. A quantitative comparison of the proposed filter with the vector median filter shows its excellent ability to reduce noise while simultaneously preserving fine image details.

关键词： Color image processing

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Some charactistical aspects of MarkRead - A software package for automatic mark data entry

Some charactistical aspects of MarkRead - A software package...

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Asia-Pacific Conference on Circuits and Systems, APCCAS 2002

作者： Tao, Ngo Quoc Toan, Do Nang Dept. of Image Processing and Knowledge Engineering Institute of Information Technology Hoang Quoc Viet Street 18 Caugiay Hanoi Viet Nam

ISBN: (纸本)0780376900

Automatic data entry plays an important role for improving speed and effectiveness for information technology. In order to recognize forms and join results into a database, it is necessary to correctly isolate geometrical objects and match forms with a pattern. Therefore, this paper presents some difficult problems of optical mark recognition such as detecting image skew, margins and basic geometrical objects, which are solved in the process of developing MarkRead, a software package for automatic mark data entry. © 2002 IEEE.

关键词： Optical data processing

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Resolving ambiguity in dept. extraction for motion capture using genetic algorithm

Resolving ambiguity in depth extraction for motion capture u...

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2002 Congress on Evolutionary Computation, CEC 2002

作者： Wai, Yin Yee Chow, Chi Kin Lee, Tong Computer Vision and Image Processing Laboratory Dept. of Electronic Engineering Chinese University of Hong Kong Shatin Hong Kong

ISBN: (纸本)0780372824

There is considerable interest in motion capture from an image sequence taken from a video camera. However, since the images only consist of 2D information, the distance of an object from the image plane cannot be determined uniquely unless some constraints are imposed. Coplanar motion is a popular constraint adopted for this purpose. If the captured motion is not coplanar, only two possible solutions can be obtained at the best even the actual size of the object is given. Therefore, the motion cannot be captured without resolving the distances of each control point from the image plane. By assuming smooth transition, the problem is formulated as one minimizing the transition between image frames and the application of GA to solve this optimization problem is proposed. © 2002 IEEE.

关键词： Video cameras

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Pruned multi-angle resolution fast beam-forming

Pruned multi-angle resolution fast beam-forming

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IEEE Sensor Array and Multichannel Signal processing Workshop, SAME 2002

作者： Yoon, Yeo-Sun Kaplan, Lance M. McClellan, James H. Center for Signal and Image Processing Georgia Institute of Technology School of Electrical and Computer Engineering AtlantaGA30332-0250 United States Dept. of Engineering CTSPS Clark Atlanta University AtlantaGA303 14 United States

ISBN: (纸本)0780375513

Delay-and-sum (DS) beam-forming is one of the basic beam-forming methods, and it is effective for both narrow- And wide-band sources. However, DS beam-forming exhibits high computational complexity. Recently, a fast multistage approximation of DS beam-forming was introduced. In order to further improve the computational efficiency of the fast beam-former, we have integrated a detector into the intermediate stages of the fast algorithm. This detector can save computations by stopping further processing to resolve benign angular sectors that do not contain a coherent source. The joint fast detector beam-former was tested using various wideband signals such as spread spectrum signals used in wireless communications. This technique should provide a useful direction finding solution in wireless communications and target localization applications. In addition, the fast algorithm can find initial values for high resolution direction-of-arrivals estimators such as coherent signal subspace methods. © 2002 IEEE.

关键词： Computational efficiency

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Stenosis detection using a new shape space for second order 3D-variations 17

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17th International Conference on Information processing in Medical Imaging, IPMI 2001

作者： Lin, Qingfen Danielsson, Per-Erik Image Processing Laboratory Dept. Electrical Engineering Linköpings Universitet 581 83 Sweden

ISBN: (纸本)3540422455

The prevalent model for second order variation in 3-D volumes is an ellipsoid spanned by the magnitudes of the Hessian eigenvalues. Here, we describe this variation as a vector in an orthogonal shape space spanned by spherical harmonic basis functions. From this newsh ape-space, a truly rotation- and shape-invariant signal energy is defined, consistent orientation information is extracted and shape sensitive quantities are employed. The advantage of these quantities is demonstrated in detection of stenosis in Magnetic Resonance Angiography(MRA) volume. The news hape space is expected to improve both the theoretical understanding and the implementation of Hessian based analysis in other applications as well. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Magnetic resonance

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Hybrid Segmentation of Anatomical Data 4th

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4th International Conference on Medical image Computing and Computer-Assisted Intervention, MICCAI 2001

作者： Imielinska, Celina Metaxas, Dimitris Udupa, Jayaram Jin, Yinpeng Chen, Ting College of Physicians and Surgeons Office of Scholarly Resources Medical Informatics Dept. and Dept. of Computer Science Columbia University United States Dept. of Computer and Information Science University of Pennsylvania United States Medical Image Processing Group Dept. of Radiology University of Pennsylvania United States Department of Biomedical Engineering Columbia University United States

ISBN: (纸本)3540426973

We propose new hybrid methods for automated segmentation of radiological patient data and the Visible Human data. In this paper, we integrate boundary-based and region-based segmentation methods which amplifies the strength but reduces the weakness of both approaches. The novelty comes from combining a boundary-based method, the deformable model-based segmentation with region-based segmentation methods, the fuzzy connectedness and Voronoi Diagram-based segmentation, to develop hybrid methods that yield high precision, accuracy and efficiency. This work is a part of a NTM funded effort to provide a fully implemented and tested Visible Human Project Segmentation and Registration Toolkit (Insight). © Springer-Verlag Berlin Heidelberg 2001.

关键词： Hospital data processing

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Improving AR using shadows arising from natural illumination distribution in video sequences

Improving AR using shadows arising from natural illumination...

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International Conference on Computer Vision (ICCV)

作者： Taeone Kim Yong-Duck Seo Ki-Sang Hong Department of E.E. Image Information Processing Laboratory South Korea Dept. of E.E Image Information Processing Lab POSTECH Korea Engineering Department SVR Lab Cambridge UK

ISBN: (纸本)0769511430

In this paper, we propose a method for generating realistic shadows of virtual objects inserted into a real video sequence. Our aim is to improve and extend the work of Sato, Sato, and Ikeuchi, (1999), which is based on a static camera, to the case of a video sequence. This extension consists of several procedures: calibration of a moving video camera and a graphic camera, removing false shadows occurring due to a shortcoming of the static camera approach for the estimation of an illumination distribution, and so on. The calibration of the moving camera is solved by camera self-calibration and, with it, we designed a flexible graphic world coordinate system embedding technique called "match move". We also show that the shortcoming of the previous static camera approach is overcome by using information from video sequence. Finally we present the experimental results of a real video sequence.

关键词： Lighting Video sequences Cameras Graphics Layout Calibration image reconstruction Information processing image sampling Shape

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SEGMENTATION OF RANGE image BASED ON KOHONEN NEURAL NETWORK

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Journal of Electronics(China) 2001年第3期18卷 237-241页

作者： Zou Ning Liu Jian Zhou Manli Li Qing(State Education Commission Res. Lab. for image processing & Intelligent Control. Electronic & Information engineering dept., Huazhong University of Science & Technology. Wuhan 430074) State Education Commission Res. Lab. for Image Processing & Intelligent Control Electronic & Information Engineering Dept. Huazhong University of Science & Technology Wuhan

This paper presents an unsupervised range image segmentation based on Kohonen neural network. At first, the derivative and partial derivative of each point are calculated and the normal in each points is gotten. With the character vectors including normal and range value, self-organization map is introduced to cluster. The normal analysis is used to eliminate over-segmentation and the last result is gotten. This method avoid selecting original seeds and uses fewer samples, moreover computes rapidly. The experiment shows the better performance.

关键词： Range image Segmentation Kohonen neural network Merge

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Packet reservation window multiple access with capture

Packet reservation window multiple access with capture

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IEEE International Conference on Communications (ICC)

作者： D.E. Ayyzldzz H. Delic Dept. of Electr. Eng. Nebraska Univ. Lincoln NE USA Signal and Image Processing Laboratory Department of Electrical and Electronics Engineering Bogazici University Istanbul Turkey

We consider the packet reservation window multiple access protocol (PRWMA) that successfully combines voice and data traffic over a cellular network. In agreement with the mobile channel environment, the presence of capture is also modeled. PRWMA is modified to accommodate the advantages presented by the capture effect. The proposed protocol's capacity and average delay performance is studied under the power capture model through simulations. Experiments indicate that significant performance gains are offered by the new algorithm.

关键词： Delay Access protocols Time division multiple access Propagation losses Power system modeling image processing Laboratories Data engineering Telecommunication traffic Traffic control

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