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Velocity tuned generalized Sobel operators for multiresolution computation of optical flow

Velocity tuned generalized Sobel operators for multiresoluti...

引用

IEEE International Conference on image processing

作者： M. Gokstorp P.-E. Danielsson Image Processing Laboratory Computer Engineering Division Department of Electrical Engineering Linköping University Sweden

Optical flow computation may be divided into four processing steps where the first is extraction of image features suitable for flow estimation. Using a generalization of the basic flow constraint it is possible to estimate flow vectors from a set of feature images obtained from the input image sequence. Generalized Sobel operators provide a suitable set of feature extraction operators. The set of five filters up to second order provides good approximations of ideal edge and line detectors. A review of spatial and frequency constraints on optical flow suggests a multiresolution approach to optical flow where the initial feature extractors consists of velocity tuned operators. We show that two-dimensional generalized Sobel operators may be extended to spatio-temporal velocity tuned filters for optical flow estimation. Experimental results compare well to existing methods.< >

关键词： Optical computing image motion analysis Optical filters Band pass filters Gabor filters Feature extraction Spatial resolution Frequency Equations image edge detection

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Parallel D-eigenvalues and parallel D-eigenvectors for linear time-varying systems

Parallel D-eigenvalues and parallel D-eigenvectors for linea...

引用

Southeastern Symposium on System Theory

作者： J.J. Zhu Electrical and Computer Engineering Department Remote Sensing and Image Processing Laboratory Louisiana State University Baton Rouge LA USA

Singular behavior of PD-eigenvalues of an nth-order scalar polynomial differential operator (SPDO) /spl Dscrsub /spl alpha=/spl deltasup n/+/spl Sigmasub k=1sup nspl alphasub k/(t)/spl deltasup k/spl minus/1/, where /spl delta/=d/dt, is investigated. Main results of this paper include: (i) definition and properties of PD-eigenvectors associated with PD-eigenvalues, (ii) definitions and properties of generalized PD-eigenvectors and generalized PD-eigenvalues for singular PD-eigenvalues; (iii) application of (i) and (ii) in stability analysis of linear time-varying (LTV) systems /spl Dscrsub /spl alpha/spl lcub/y/spl rcub/=0, and (iv) application (i) and (ii) in the realization of PD-characteristic equation. The new results will have a significant impact on applications of the unified eigenvalue theory to the analysis and control of LTV control systems, and its further development.< >

关键词： Time varying systems Eigenvalues and eigenfunctions Control systems Polynomials Stability analysis Control system analysis Riccati equations Remote sensing image processing Laboratories

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Meromorphic D-similarity transformation for linear time-varying systems

Meromorphic D-similarity transformation for linear time-vary...

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Southeastern Symposium on System Theory

作者： J.J. Zhu Electrical and Computer Engineering Department Remote Sensing and Image Processing Laboratory Louisiana State University Baton Rouge LA USA

This study constitutes an effort in identifying a class of unbounded coordinate transformations for vector linear time-varying systems of the form x/spl dot/=A(t)x. Main results of this paper include: (i) the definition and properties of meromorphic D-similarity transformations, (ii) two theorems on stability preserving meromorphic transformations. The results appear to be somewhat restrictive, but certainly shed some light on this intriguing yet difficult problem.< >

关键词： Time varying systems Polynomials Vectors Stability analysis Remote sensing image processing Laboratories Asymptotic stability

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Real-time histogram generation using optical scanning

Real-time histogram generation using optical scanning

引用

Southeastern Symposium on System Theory

作者： R.J. Pieper J.K. Richstein C.-M. Ho A. Lee T.-C. Poon Department of Electrical and Computer Engineering Naval Postgraduate School Monterrey CA USA Optical Image Processing Laboratory Bradley Department of Electrical Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

A prototype of an optical-electronic histogram generator has been designed and tested for 1-D objects. In this scheme, the object to be analyzed is laser scanned. The resulting optical signal is detected by a photodetector which generates an electrical signal output which is subsequently analyzed with a combination of analog and digital electronics. The system has shown to be fairly modular in design. Various aspects of the extension of the design to two dimensions is discussed.< >

关键词： Histograms Circuits Signal generators Nonlinear optics Clocks Photodetectors Mirrors Signal analysis Optical scattering Signal processing

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A CMOS VLSI IC for real-time opto-electronic two-dimensional histogram generation

A CMOS VLSI IC for real-time opto-electronic two-dimensional...

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Southeastern Symposium on System Theory

作者： J.K. Richstein D.J. Fouts R.J. Pieper T.-C. Poon Department of Electrical and Computer Engineering Naval Postgraduate School Monterrey CA USA Optical Image Processing Laboratory Bradley Department of Electrical Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

Histogram generation, a standard image processing operation, is a record of the intensity distribution in the image. A prototype of an optical-electronic histogram generator has been designed and tested for 1D objects using wirewrapped MSI TTL components (Richstein et al. 1993). The overall system design is such that the electronic signal obtained from the optically scanned two-dimensional semi-opaque image is processed and displayed within a period of one cycle of the scanning process. The authors report a VLSI design to be used in a two-dimensional real-time histogram generation scheme.< >

关键词： Very large scale integration CMOS integrated circuits Histograms Optical recording image generation image processing Prototypes Optical devices Optical design Testing

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Real-time frame-to-frame automatic contour detection on echocardiograms

Real-time frame-to-frame automatic contour detection on echo...

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computers in Cardiology (CinC)

作者： J.G. Bosch G. van Burken S.S. Schukking R. Wolff A.J. van de Goor J.H.C. Reiber Laboratory for Clinical and Experimental Image Processing Department of Diagnostic Radiology University Hospital Leiden Netherlands Department of Computer Architecture Faculty of Electrical Engineering Delft University of Technnology Netherlands

A PC-based system for real-time left ventricular endocardial contour detection on echocardiographic images has been developed in our laboratories. The system consists of an IBM-compatible PC equipped with a commercially available frame grabber and the special-purpose Minimum Cost Contour Detector (MCCD) board developed for this project. The MCCD board uses 1 or 2 Intel i960 processors and receives digital images (512*512*8 bit) from the frame grabber over a digital video bar in real time. The contour detection algorithm is based on dynamic programming. Detected contours and other results are transferred to the host via the AT-bus. processing time is short enough for real-time performance in a practical situation. Area of contours and regional areas in 8 segments are calculated in real time and displayed in graphs on the host system. The MCCD board is fully programmable and may be used for similar real-time contour detection applications, e.g. for X-ray angiography and intravascular ultrasound.< >

关键词： Real time systems Laboratories Costs Digital images Detection algorithms Dynamic programming X-ray detection X-ray detectors Angiography Ultrasonic imaging

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A new adaptive image contrast enhancement method

A new adaptive image contrast enhancement method

引用

image and Video processing 1993

作者： Yu, Tian-Hu Mitra, S.K. Department of Electrical and Computer Engineering Signal and Image Processing Laboratory University of California Santa BarbaraCA93106 United States

In direct methods of contrast enhancement, a contrast measure is first defined, which is then modified by a mapping function to generate the pixel value of the enhanced image. Various mapping functions such as the square root function, the exponential function, etc., have been introduced for the contrast measure modification. However, these functions do not produce satisfactory contrast enhancement results and are usually sensitive to noise and digitization effects. In addition, they are computationally complex from the point of view of implementation. In this paper, we propose a simple polynomial mapping function for the contrast measure modification. The polynomial function is easy to implement on digital computers and provides very satisfactary contrast enhancement. We also introduce an adaptive clipping technique to control the dynamic range of the output image. © 1993 SPIE. All rights reserved.

关键词： Exponential functions

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Root-loci for periodic linear systems 25

Root-loci for periodic linear systems

引用

25th Southeastern Symposium on System Theory, SSST 1993

作者： Zhu, J. Vemula, S.K. Louisiana State Univ. Electrical and Computer Engineering Department Baton RougeLA70803 United States Louisiana State Univ. Remote Sensing Aind Image Processing Laboratory Baton RougeLA70803 United States

ISBN: (纸本)0818635606

According to the Floquet theory, an nth-order linear periodic (LP) system of the form yn+αn(t) y/sup n-1/+...+α2(t)dy(t)/dt+α1(t)y=0 can be transformed into an equivalent linear time-invariant (LTI) system whose characteristic roots, known as Floquet characteristic exponents (FCEs), determine the stability of the LP system. A technique for obtaining an approximation of the characteristic equation for the FCEs is developed. Parametric loci of the FCE, similar to the root locus plot for a LTI system, are then developed for the LP system. The technique is exemplified by 2nd-order LP systems. The FCE loci are useful in the stability analysis and control design for LP systems. © 1993 IEEE.

关键词： Root loci

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Histogram-shape preserving algorithm for image enhancement

Histogram-shape preserving algorithm for image enhancement

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： T.-H. Yu S.K. Mitra Department of Electrical and Computer Engineering Signal and Image Processing Laboratory University of California Santa Barbara CA USA

A new direct contrast enhancement algorithm is proposed. It can be used to enhance the contrast of an image without increasing the dynamic range of the pixel values. A distinctive property of the proposed method is that it yields results matching the characteristic of the human visual system. The histogram of the enhanced image has almost the same shape as that of the original image.< >

关键词： image enhancement Dynamic range Pixel Histograms Shape Humans Visual system Displays Computational complexity Signal processing

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Nonlinear filters for image sharpening and smoothing

Nonlinear filters for image sharpening and smoothing

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IEEE International Conference on Systems engineering

作者： Mitra Yu Signal and Image Processing Laboratory Department of Electrical & Computer Engineering University of California Santa Barbara CA USA

A general approach to the transform-magnitude-shaping-based image enhancement method is advanced. In the method, the magnitude of the input image transform is modified using a nonlinear mapping expressible as a power series, while its phase is kept invariant. The inverse transform of the modified image transform results in a sharpening or smoothing depending on the choice of the power series coefficients. Further improvement in the overall enhancement is achieved by a two-channel processing scheme which is implemented by applying different transform amplitude shaping methods to the low-frequency and high-frequency components. Examples the proposed enhancement method are included.< >

关键词： Filtering image processing Transforms

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