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检索条件"主题词=Algorithm development"

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NONPARAMETRIC MULTISCALE CURVE SMOOTHING

NONPARAMETRIC MULTISCALE CURVE SMOOTHING

引用

CONF ON APPLICATIONS OF ARTIFICIAL INTELLIGENCE 1993 : MACHINE VISION AND ROBOTICS ( PREPRINTS )

作者： ROSIN, P Curtin Univ. of Technology (Australia)

ISBN: (纸本)0819412007

Lowe demonstrated a method for automatically segmenting and smoothing image curves by varying degrees. It was intended to remove noise and unnecessary fine detail, aiding subsequent processing such as grouping and matching. An alternative technique is described in this paper that is based on recursively subdividing the curve into alternative sets of sections. Rather than use thresholds on the values of curvature and its derivatives to determine the segmentation and degree of smoothing our technique is driven by three qualitative measures: (1) a criterion for selecting potential breakpoints, (2) a criterion for determining the amount of smoothing for curve sections, and (3) a significance measure that determines which sections form the best selection. The advantages of the technique are robustness, scale invariance, and the absence of parameters.

关键词： Evolutionary algorithms Image segmentation Artificial intelligence Image processing Image processing algorithms and systems algorithm development Quantization Error analysis Feature extraction Fourier transforms

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REAL-TIME NAVIGATION AND OBSTACLE AVOIDANCE FOR TELEOPERATED VEHICLES

REAL-TIME NAVIGATION AND OBSTACLE AVOIDANCE FOR TELEOPERATED...

引用

CONF ON MOBILE ROBOTS 7

作者： BOUFFOUIX, S BOGAERT, M Univ. Libre de Bruxelles (Belgium) Belgian Scientific and Technical Research Ctr. of the Metalworking Industry (Belgium)

ISBN: (纸本)0819410322

In this paper, we describe a real-time navigation assistance system dedicated to teleoperated vehicles for indoor applications. In order to obtain real-time reaction and motion continuity (no ''perception/move/step'' cycle), the system is decomposed in three levels working in parallel, with short cycle times. The lowest level, the pilot, continuously computes tangential and rotational speeds for the locomotion system, in order to follow a particular subgoal. This subgoal is dynamically generated by the second level, the subgoal generator, in order to avoid local obstacles, and tracking milestones positions (x,y,th). The highest level, the geometrical path planner, computes an optimal path composed of milestones to be roughly followed by the vehicle. In the first part of the paper, we present a global view of the navigation assistance system, its decomposition in three levels and its embedding in the overall system. In the second part, we give a more detailed description of each level, and we terminate with a presentation of results obtained in a real environments.

关键词： Navigation systems Mobile robots algorithm development Sensors Computer simulations Environmental sensing Motion models Safety Automatic control Pollution control

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DESIGN OF A COMMON DATABASE FOR RESEARCH IN MAMMOGRAM IMAGE-ANALYSIS

DESIGN OF A COMMON DATABASE FOR RESEARCH IN MAMMOGRAM IMAGE-...

引用

CONF ON BIOMEDICAL IMAGE PROCESSING AND BIOMEDICAL VISUALIZATION

作者： DANCE, DR Royal Marsden Hospital and Institute of Cancer Research (United Kingdom)

ISBN: (纸本)0819411388

The advantages of a common database for rnammographic image analysis are indisputable. I believe that we have reached the stage where the need for such a database is urgent. However, the problem of designing a common database is not trivial and there are many questions which must be answere(l before major effort should be invested in its production.

关键词： Databases algorithm development Image analysis Mammography Absorbance Digital imaging Image storage Tissues Cancer Physics

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SHAPE RECONSTRUCTION FROM SHADING WITH PERSPECTIVE PROJECTION

SHAPE RECONSTRUCTION FROM SHADING WITH PERSPECTIVE PROJECTIO...

引用

CONF ON APPLICATIONS OF ARTIFICIAL INTELLIGENCE 1993 : MACHINE VISION AND ROBOTICS ( PREPRINTS )

作者： LEE, KM KUO, CCJ Univ. of Southern California (South Korea) Univ. of Southern California (United States)

ISBN: (纸本)0819412007

In this research, we propose a novel algorithm which recovers the surface height directly from images obtained via perspective projection. Most existing shape from shading (SFS) algorithms are developed under the assumption of an orthogonal projection model, which is a special case of the general perspective projection model. As a result, there exist substantial reconstruction errors in their real applications especially for the case when the object is not far away from the camera. By introducing an explicit triangular element surface model and combining perspective imaging geometry, we are able to relax the orthogonal projection assumption and derive a more general reflectance model with perspective projection. We formulate the perspective SFS problem as a minimization problem parameterized by surface nodal heights, and determine the surface height by solving an equivalent linear system of equations. Simulation results for several test images are given to demonstrate the performance of the proposed algorithm. The proposed perspective SFS algorithm gives more accurate results than conventional SFS algorithms and is very attractive in practical applications.

关键词： Evolutionary algorithms Reconstruction algorithms Reflectivity Artificial intelligence Cameras Image processing 3D modeling Light sources algorithm development Visual process modeling

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ADAPTIVE WEIGHTED MEDIAN PREDICTIVE CODING OF IMAGES 4

ADAPTIVE WEIGHTED MEDIAN PREDICTIVE CODING OF IMAGES

引用

4TH CONF ON NONLINEAR IMAGE PROCESSING

作者： SONG, XD YIN, L NEUVO, Y Tampere Univ. of Technology (Finland)

ISBN: (纸本)0819411353

In linear predictive coding, especially in adaptive linear predictive coding, channel errors tend to propagate destroying significant portions of an image. In this paper, an adaptive weighted median predictive coding scheme which is robust against channel errors is proposed. Neither overhead information nor error correction coding is needed. The scheme is applied to real images and is shown to provide much improved performance at high bit error rates (BER).

关键词： Aluminium phosphide Image compression Nonlinear image processing Digital filtering algorithm development Binary data Electrical engineering Forward error correction Modulation Optimal filtering

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SINGLE-SHOT MEASUREMENT OF THE INTENSITY AND PHASE OF A FEMTOSECOND LASER-PULSE

SINGLE-SHOT MEASUREMENT OF THE INTENSITY AND PHASE OF A FEMT...

引用

CONF ON ULTRAFAST PULSE GENERATION AND SPECTROSCOPY

作者： KANE, DJ TREBINO, R Southwest Sciences Inc. (United States) Sandia National Labs. (United States)

ISBN: (纸本)0819410888

We report and demonstrate a new technique to measure the full intensity and phase of a single femtosecond laser pulse. The technique, which we call 'frequency resolved optical gating' (FROG), is inexpensive, easy to implement, and provides an output that graphically displays the instantaneous frequency vs. time of the pulse. Using almost any instantaneous nonlinear- optical interaction of two replicas of the ultrashort pulse to be measured, FROG involves measuring the spectrum of the signal pulse as a function of delay between the two replicas. The resulting trace of intensity vs. frequency and delay yields an intuitive display of the pulse, similar to the pulse spectrogram. We show that the problem of inverting the FROG trace to obtain the pulse intensity and phase is a two-dimensional phase-retrieval problem. As a result, the FROG trace yields, in principle, an essentially unique pulse intensity and phase. In this work, we show that this is the case in practice, also. In addition, we present an iterative- Fourier-transform algorithm for inverting the FROG trace.

关键词： Spectroscopy Ultrafast phenomena Phase retrieval Femtosecond phenomena algorithm development Ultrafast laser spectroscopy Fourier transforms CCD cameras Polarization Cameras

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FAST POSITION MEASUREMENT USING CCD

FAST POSITION MEASUREMENT USING CCD

引用

2nd International Symposium on Measurement Technology and Intelligent Instruments

作者： YUAN, F DING, ZL XU, J JIANG, ZM QIANG, XF HARBIN INST TECHNOL DEPT PRECIS INSTRUMENTSHARBIN 150006PEOPLES R CHINA

ISBN: (纸本)0819413844

A measurement system of position composed of CCD image sensor hardware circuits and a single chip microprocessor system is presented in this paper. It makes use of hardware circuits and software to realize a dynamic WifldoW in which the position signal is contained when doing measurement. Coupled with interpolation and look up table technique subpixel a c c Li r a c y and high rate measurment can be achieved. This measurement system can be used in aligning ziicasuring angle pointing etc.

关键词： Charge-coupled devices Signal processing CCD image sensors algorithm development Digital signal processing Sensors Electronic circuits Lithium Optical amplifiers Software development

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INTERACTIVE TASK PLANNING SYSTEM FOR SPACE ROBOTS

INTERACTIVE TASK PLANNING SYSTEM FOR SPACE ROBOTS

引用

1993 SPIE Technical Conference on Telemanipulator Technology and Space Telerobotics

作者： OKABAYASHI, K WATANABE, I AOKI, T MARUYAMA, T UCHIYAMA, T FUJITSU LABS LTD NAKAHARA KUKAWASAKIKANAGAWA 211JAPAN

ISBN: (纸本)0819413224

For space robots telemanipulation long communication delay and operator load are serious problems. We have developed a useful off-line robot motion planning system. The operator enters commands using object-level instructions, and low-level actions like path planning, sensor feedback, etc. are generated and executed automatically. The command generation and path planning algorithms in this system are original. The path planning algorithm can generate a collision free path in a few seconds using ready-made suggested paths which we call path- templates. The system greatly simplifies the operator's task and also frees the operator from dealing with the communication delay inherent in space robot telemanipulation.

关键词： Space robots Sensors Motion models Human-machine interfaces Telecommunications Robotic systems algorithm development Relays Visualization Control systems

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ADAPTING FDDI TO GIGABIT TRANSMISSION RATES

ADAPTING FDDI TO GIGABIT TRANSMISSION RATES

引用

2ND CONF ON HIGH-SPEED FIBER NETWORKS AND CHANNELS

作者： DOBOSIEWICZ, W GBURZYNSKI, P Univ. of Alberta (Canada)

ISBN: (纸本)0819409634

The FDDI ring-protocol combination is well-suited for large local (`campus') area networks. However, for larger networks, FDDI users suffer excessive access delay, even under very light traffic. Moreover, FDDI achieves full capacity only in special circumstances, and heavy load is not a sufficient condition for achieving it. We propose a modification of FDDI that has none of these deficiencies. By changing the interpretation of holding the token, we get a protocol that allows every station to transmit when the link is silent. The resulting token-passing protocol yields a capacity-1 network even for modest values of TTRT. Additionally, stations endure a very small access delay under light load. All the other properties are identical to those of FDDI. The proposed protocol uses standard FDDI components. Moreover, the protocol is compatible with FDDI to the point that it works correctly even if some of the stations attached to it operate under the original FDDI protocol (those stations will get the performance offered by FDDI, while the stations using the new protocol will get a larger bandwidth and a lesser access delay).

关键词： Local area networks Receivers Information operations Failure analysis algorithm development Clocks Palladium Solar concentrators Transmitters Visualization

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WAVELET-BASED SENSOR FUSION 6

WAVELET-BASED SENSOR FUSION

引用

CONF ON SENSOR FUSION 6

作者： HUNTSBERGER, T JAWERTH, B Univ. of South Carolina (United States)

ISBN: (纸本)0819413240

Sensor fusion can be performed either on the raw sensor output or after a segmentation step has been done. Our previous work has concentrated on neural network models for sensor fusion after segmentation. Although this method has been shown to be fast and reliable, there is still the overhead entailed from using entire images. The wavelet transform is a multiresolution method that is used to decompose images into detail and average channels. These channels maintain all of the image information and sensor fusion logic operations can be done within the wavelet coefficient space. In addition, image compression can be done within this same space for possible remote transmission. This paper examines sensor fusion within the wavelet coefficient space. The results of some experimental studies performed on the 1024 node NCUBE/10 at the University of South Carolina are also included.

关键词： Wavelets Image fusion Image segmentation Sensor fusion Image compression Wavelet transforms algorithm development Image processing algorithms and systems Logic Sensors

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