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IEEE International Symposium on Geoscience and remote sensing (IGARSS)

作者： D.G. Long Microwave Earth Remote Sensing (MERS) Laboratory Electrical and Computer Engineering Department Brigham Young University Provo UT USA

The NASA Scatterometer (NSCAT) is a spaceborne scatterometer which flew aboard the National Space Development Agency of Japan's ADvanced Earth Observing Satellite (ADEOS). The NSCAT instrument has proven to be remarkably sensitive and accurate, achieving a calibration of within a few tenths of a dB. The key source of calibration error for NSCAT /spl sigma//sup 0/ measurements is the spacecraft attitude knowledge. Unfortunately, the attitude of the ADEOS spacecraft as determined by its onboard sensors is not as accurate as desired. Further, there appear to be biases in the spacecraft attitude between the ascending and descending portions of the orbit. The accuracy and stability of the NSCAT instrument makes it possible to use the /spl sigma//sup 0/ measurements to infer the mean spacecraft attitude. This approach models the observed /spl sigma//sup 0/ as a polynomial function of incidence angle and determines gain corrections to ensure consistency between different antennas (beam balance) while estimating the orbit-varying spacecraft attitude such that the beam balance correction is fixed over the orbit and with time. The result is improved accuracy and consistency of the /spl sigma//sup 0/ measurements.

关键词： Position measurement Space vehicles Extraterrestrial measurements Radar measurements Spaceborne radar Instruments Calibration Antenna measurements NASA Earth

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Comparison of TRMM and NSCAT observations of surface backscatter over the Amazon rain forest

Comparison of TRMM and NSCAT observations of surface backsca...

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IEEE International Symposium on Geoscience and remote sensing (IGARSS)

作者： D.G. Long Microwave Earth Remote Sensing (MERS) Laboratory Electrical and Computer Engineering Department Brigham Young University Provo UT USA

The Tropical Rain Measuring Mission (TRMM) precipitation radar (PR) is designed to measure backscatter from rain in order to map the amount and extent of rain in the tropical regions. The TRMM PR also measures the normalized radar cross section (/spl sigma//spl deg/) of the surface at a nominal resolution of approximately 4.4 km over an incidence range of 0-18/spl deg/. The Ku-band NASA Scatterometer (NSCAT) made 25 km resolution measurements of the surface /spl sigma//spl deg/ at incidence angles of 15.5/spl deg/ and higher and at 10.5/spl deg/. A comparison of NSCAT and TRMM PR /spl sigma//spl deg/ observations over the Amazon rain forest is presented. The relative calibration and noise levels of the two sensors are compared.

关键词： Backscatter Rain Extraterrestrial measurements Sea measurements Radar measurements Spaceborne radar Radar cross section Sea surface Calibration Earth

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image region extraction for content-based image retrieval 9

Image region extraction for content-based image retrieval

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9th European Signal processing Conference, EUSIPCO 1998

作者： Androutsos, D. Plataniotis, K.N. Venetsanopoulos, A.N. Department of Electrical and Computer Engineering Digital Signal and Image Processing Laboratory University of Toronto 10 King's College Road TorontoONMoS3G4 Canada Ryerson Polytechnic University 350 Victoria Street Toronto ONM5B2K3 Canada

We present a technique for coarsely extracting the regions of natural color images which contain directional detail, e.g.. edges, texture, etc.. and smooth color regions. which we then use for image database indexing. As a measure of color activity, we use a perceptually modified distance measure based on the sum-of-Angles criterion. We then apply histogram thresholding techniques to separate the image into smooth color regions and busy regions where edge, texture and color activity exists. Color segmentation is performed on the smooth areas using HSV histogram techniques, to obtain image regions with one dominant average color. Database indices are then created from the busy regions using the directional detail histogram technique along with the color vectors representing the segmented smooth areas. image retrieval is then performed using the histogram intersection method for the detailed areas and color vector distance measures are utilized for retrieval of the smooth color regions.

关键词： Color

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A Family Of Order Statistic Based Dissimilarity Measures And Their Application In image processing

A Family Of Order Statistic Based Dissimilarity Measures And...

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International Conference on Optimization of electrical and Electronic Equipment, OPTIM

作者： C. Vertan V. Buzuloiu R.M. Rangayyan Image Processing and Analysis Laboratory (IPAL) Applied Electronics and Information Engineering DepartmentFaculty of Electronics and Telecommunications Politehnica University Bucharest Romania Department of Electrical and Computer Engineering University of Calgary Calgary AB Canada

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Video segmentation of MPEG compressed data

Video segmentation of MPEG compressed data

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IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： I. Koprinska S. Carrato Indian Institute of Technology Bangalore Sofia Bulgaria Department of Electrical Engineering and Computer Science (D.E.E.I.) Image Processing Laboratory University of Trieste Trieste Italy

An approach for parsing MPEG compressed video into shots and sub-shots based only on the macroblock (MB) and motion vector (MV) information is presented. The system follows a two-pass scheme and has a hybrid rule-based/neural structure. A rough scan over the P frames locates the potential shot boundaries and the solution is then refined by a precise scan over the B frames of the respective neighborhoods. The "simpler" boundaries are recognized by the rule-based module, while the decisions for the "complex" ones are refined by the neural part. The latter is also used to distinguish dissolves from object and camera motions and to break the shots into sub-shots. The experiments demonstrate high speed and accuracy in shot detection and their characterization.

关键词： Video compression Transform coding Cameras image coding image reconstruction image segmentation Gunshot detection systems Histograms image processing Laboratories

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Twin-image removal by digital filtering and optical scanning holography

Twin-image removal by digital filtering and optical scanning...

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Southeastern Symposium on System Theory

作者： Taegeun Kim Ting-Chung Poon G. Indebetouw Optical Image Processing Laboratory Bradely Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA Physics Department Virginia Polytechnic Institute and State University Blacksburg VA USA

We propose an adjusted digital filtering method to overcome the Nyquist limitation of the iterative algorithm used to eliminate the twin image and demonstrate its advantages over existing algorithms. We also have appl... 详细信息

关键词： Optical filters Holographic optical components Digital filters Filtering Holography image reconstruction Bandwidth Optical noise Optical recording Convolution

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Normal mammogram analysis and recognition

Normal mammogram analysis and recognition

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IEEE International Conference on image processing

作者： Sheng Liu C.F. Babbs E.J. Delp Department of Basic Medical Sciences School of Veterinary Medicine Purdue University West Lafayette IN USA Video and Image Processing Laboratory (VIPER) School of Electrical and Computer Engineering Purdue University West Lafayette IN USA

Presents a novel approach to the problem of computer aided analysis of digital mammograms for breast cancer detection: namely, the development of algorithms to recognize unequivocally normal mammograms. First, the authors eliminate amorphous "clouds" or "blobs" in mammograms produced by normal glandular tissue of varying density using local average subtraction. Then the authors identify and remove normal connective tissue markings based on a set of specially designed line detectors. Any abnormality that may exist in the mammogram is therefore enhanced in the residual image, which makes the decision regarding the normality of the mammogram, much easier.

关键词： Lesions Biomedical imaging Medical diagnostic imaging Breast Cancer Tumors image processing Laboratories Biomedical engineering computer aided analysis

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YINSAR: a compact, low-cost interferometric synthetic aperture radar

YINSAR: a compact, low-cost interferometric synthetic apertu...

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IEEE International Symposium on Geoscience and remote sensing (IGARSS)

作者： D.G. Thompson D.V. Arnold D.G. Long G.F. Miner M.A. Jensen T.W. Karlinsey A.E. Robertson J.S. Bates Dept. of Electr. & Comput. Eng. Brigham Young Univ. Provo UT USA Microwave Earth Remote Sensing Laboratory Electrical and Computer Engineering Department Brigham Young University Provo UT USA Brigham Young University Provo UT US

Synthetic aperture radar (SAR) has proven useful for many different applications. Many more applications would be possible with a low-cost instrument. To address this need, BYU (Brigham Young University) has developed YSAR and YINSAR. These compact, low-cost systems are operated from four or six passenger aircraft. The prototype system, YSAR, showed the feasibility of obtaining images with low-cost SAR. YINSAR is an interferometric SAR with many improvements over YSAR. This paper reports the current status of YINSAR.

关键词： Synthetic aperture radar interferometry Instruments Costs Synthetic aperture radar Aircraft Prototypes Radio frequency Earth remote sensing Laboratories

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A Region-Based Representation of images in MARS

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Journal of VLSI Signal processing Systems for Signal, image, and Video Technology 1998年第1-2期20卷 137-150页

作者： Servetto, Sergio D. Rui, Yong Ramchandran, Kannan Huang, Thomas S. Beckman Inst. Adv. Sci. and Technol. Univ. Illinois at Urbana-Champaign Urbana IL 61801 United States Universidad Nacional de La Plata Argentina Univ. Illinois at Urbana-Champaign United States Comp. Res. Adv. Applications Group IBM Argentina Argentina Image Formation and Processing Group Beckman Institute UIUC United States Department of Computer Science UNLP Argentina Dept. of Elec. and Comp. Engineering UIUC United States Multimedia Commun. Res. Department Bell Laboratories Murray Hill NJ United States Info. Sciences Research Department AT and T Labs. Florham Park NJ United States Department of Computer Science UIUC United States Southeast University China Tsinghua University China University of Illinois Urbana-Champaign IL United States Image Formation and Processing Group Beckman Inst. Advance Sci. Technol. UIUC United States Vis. Technol. Grp. of Microsoft Res. Redmond WA United States City College of New York United States Columbia University United States AT and T Bell Labs. United States Ctr. for Telecommunications Research Columbia University United States Elec. and Comp. Eng. Department United States Beckman Institute Coordinated Science Laboratory IL United States IEEE Signal Processing Society United States IEEE IMDSP Technical Committee United States IEEE Transactions on Image Proc. United States National Taiwan University Taipei Taiwan Massachusetts Inst. of Technology Cambridge MA United States Department of Electrical Engineering MIT United States School of Electrical Engineering United States Lab. for Info. and Signal Processing Purdue University United States Dept. of Elec. and Comp. Engineering United States Coordinated Science Laboratory United States Image Formation and Processing Group Beckman Inst. Adv. Sci. and Technol. United States MIT Lincoln Laboratory IBM Thomas J. Watson Research Center Rheinishes Landes Museum Bonn Germany Swiss Institutes of Technology Zurich Switzerland Swiss Institutes of Technology Lausanne S

We study the problem of representing images within a multimedia Database Management System (DBMS), in order to support fast retrieval operations without compromising storage efficiency. To achieve this goal, we propose new image coding techniques which combine a wavelet representation, embedded coding of the wavelet coefficients, and segmentation of image-domain regions in the wavelet domain. A bitstream is generated in which each image region is encoded independently of other regions, without having to explicitly store information describing the regions. Simulation results show that our proposed algorithms achieve coding performance which compares favorably, both perceptually and objectively, to that achieved using state-of-the-art image/video coding techniques while additionally providing region-based support.

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1.5V resistive fuse for image smoothing and segmentation

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ELECTRONICS LETTERS 1997年第10期33卷 851-852页

作者： Athreya, JKV Gregson, PH Department of Electrical Engineering Computer Vision and Image Processing Laboratory Technical University of Nova Scotia Halifax Canada

A 1.5V resistive fuse for image smoothing and segmentation using bulk-driven MOSFETs is presented. The circuit switches on only if the differential voltage applied across its input terminals is less than a set voltage;it switches off if the differential voltage is higher than the set value. The useful operation range of the circuit is 0.4V with a supply voltage of 1.5V and threshold voltages of V-Tn = 0.828V and V-Tp = -0.56V for n and g channel MOSFETs, respectively.

关键词： image processing segmentation (image processing)

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