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Recursive disparity estimation algorithm for real time stereoscopic video applications

Recursive disparity estimation algorithm for real time stere...

引用

IEEE International Conference on Image Processing

作者： E.A. Hendriks G. Marosi Department of EE Information Theory Group Delft University of Technnology Delft Netherlands Department of Telecommunication and Telematics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Several implementations of a recursive disparity estimator have been investigated in which bi-directional spatial predictions as well as temporal predictions are used. The recursive disparity estimator is showed to be very attractive for real time multi-view interpolation applications because of the use of the predictions and small search ranges or update sets. The estimated disparity fields are smooth, causing less visible artifacts in the interpolated intermediate viewpoints. Moreover, the recursive estimator is attractive for hardware implementation. Only a small number of updates have to be checked, thereby considerably reducing the number of operations to be executed.

关键词： Recursive estimation Motion estimation Cameras Image sequences Hardware Information theory Telematics Bidirectional control Interpolation Layout

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SLOW: A Practical pseudonym changing scheme for location privacy in VANETs

SLOW: A Practical pseudonym changing scheme for location pri...

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IEEE Vehicular Networking Conference (VNC)

作者： Levente Buttyán Tamás Holczer André Weimerskirch William Whyte Laboratory of Cryptography and Systems Security (CrySyS) Budapest University슠of슠Technology슠and슠Economics Hungary Escrypt Inc. USA NTRU Cryptosystems USA

ISBN: (纸本)9781424456857

Untraceability of vehicles is an important requirement in future vehicle communications systems. Unfortunately, heartbeat messages used by many safety applications provide a constant stream of location data, and without any protection measures, they make tracking of vehicles easy even for a passive eavesdropper. One commonly known solution is to transmit heartbeats under pseudonyms that are changed regularly in order to obfuscate the trajectory of vehicles. However, this approach is effective only if some silent period is kept during the pseudonym change and several vehicles change their pseudonyms nearly at the same time and at the same location. Unlike previous works that proposed explicit synchronization between a group of vehicles and/or required pseudonym change in a designated physical area (i.e., a static mix zone), we propose a much simpler approach that does not need any explicit cooperation between vehicles and any infrastructure support. Our basic idea is that vehicles should not transmit heartbeat messages when their speed drops below a given threshold, say 30 km/h, and they should change pseudonym during each such silent period. This ensures that vehicles stopping at traffic lights or moving slowly in a traffic jam will all refrain from transmitting heartbeats and change their pseudonyms nearly at the same time and location. Thus, our scheme ensures both silent periods and synchronized pseudonym change in time and space, but it does so in an implicit way. We also argue that the risk of a fatal accident at a slow speed is low, and therefore, our scheme does not seriously impact safety-of-life. In addition, refraining from sending heartbeat messages when moving at low speed also relieves vehicles of the burden of verifying a potentially large amount of digital signatures, and thus, makes it possible to implement vehicle communications with less expensive equipments.

关键词： Privacy Heart beat Vehicle safety Cryptography Communication system security Vehicle driving Laboratories Protection Accidents Digital signatures

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Stability analysis of feedback controlled resonant DC-DC converter using Poincare map function

Stability analysis of feedback controlled resonant DC-DC con...

引用

IEEE International Symposium on Industrial Electronics (ISIE)

作者： O. Dranga I. Nagy Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Hungary

ISBN: (纸本)0780370902

The stability analysis of the buck member of a dual channel resonant DC-DC converter family is reported. The study is confined to the symmetrical continuous current mode. The output voltage of the converter is controlled by a feedback loop applying constant frequency PWM. The dynamic analysis applies to stability criterion the positions of the characteristic multipliers of the Jacobian matrix belonging to the Poincare map function defined around the fixed point located in the Poincare plane where the trajectory of the variable structure, piecewise linear, nonlinear system pierces through the plane. The study reveals that the process loses its stability as a result of varying the loop gain.

关键词： Stability analysis Adaptive control Resonance DC-DC power converters Voltage control Feedback loop Frequency conversion Frequency locked loops Pulse width modulation Pulse width modulation converters

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Sensitivity analysis of time encoded bandlimited signals

Sensitivity analysis of time encoded bandlimited signals

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： A.A. Lazar L. Toth Department of Electrical Engineering Columbia University New York NY USA Department of Telecommunication and Media Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

A time encoding machine, consisting of a feedback loop containing an adder, an integrator and a Schmitt trigger, encodes amplitude information into a time sequence. We demonstrate how to construct a time decoding machine that perfectly recovers the amplitude information from the time sequence and is trigger parameter insensitive. We derive bounds on the error in signal recovery introduced by the quantization of the time sequence. We compare these with the recovery error introduced by the quantization of the amplitude of the bandlimited signal when irregular sampling is employed. Under Nyquist-type rate conditions, quantization of a bandlimited signal in the time and amplitude domains are shown to be largely equivalent methods of information representation.

关键词： Sensitivity analysis Encoding Quantization Trigger circuits Sampling methods Information representation Feedback loop Decoding Time division multiplexing Telecommunications

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Alternative admission rules based on the many sources asymptotics

Alternative admission rules based on the many sources asympt...

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IEEE Symposium on Computers and Communications (ISCC)

作者： G. Seres A. Szlavik J. Zatonyi J. Biro Traffic Analysis and Network Performance Laboratory Ericsson Research Hungary Hungary HSN Laboratory DTT Budapest University슠of슠Technology슠and슠Economics Hungary

This paper identifies the requirements placed against a resource manager function for use in QoS-enabled IP networks. The structure of the Internet and the composition of the services motivate the development of on-line resource brokers that can make admission decisions in real time, based on the best up-to-date information available on the state of the network. The difficulties with traffic models and traffic characterisation stimulate the use of measurement-based techniques that bypass the modelling step and provide the resource requirements of the traffic directly. The paper introduces a novel method for the computation of the bandwidth requirement of Internet traffic flows using the many sources asymptotics. The estimator method significantly reduces the computational complexity of the calculations, allowing the real-time operation of the algorithm even in a measurement-based environment. The method delivers bandwidth-type quantity, the format preferred by Internet control applications. The savings arising from the reduced computational complexity compared to existing methods are demonstrated in a numerical example.

关键词： Telecommunication traffic Quality of service Traffic control IP networks Resource management Web and internet services Bandwidth Communication system traffic control Computational complexity Delay estimation

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Friction and backlash measurement and identification method for robotic arms

Friction and backlash measurement and identification method ...

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International Conference on Advanced Robotics (ICAR)

作者： Lorinc Marton Bela Lantos Department of Electrical Engineering Sapientia Hungarian University of Transylvania Targu-Mures Romania Department of Control Engineering and Information Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

The paper presents a friction and a backlash identification method for robotic arms that are based on measurements performed during controlled robot motion. A modified friction model is proposed making use of which the linear least squares method can be applied for friction identification. The influence of the robot nonlinearities were also taken into consideration during the friction identification. The backlash gap was measured when the robot arm changes its direction taking into consideration the velocity and the drive motor current. A robot velocity control algorithm is also proposed for friction and backlash measurement. Experimental measurements are presented to show the applicability of the theoretical results.

关键词： Friction Arm Velocity measurement Manipulators Motion measurement Performance evaluation Motion control Robot control Robot motion Least squares methods

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Optimum noncoherent FM-DCSK detector: application of chaotic GML decision rule

Optimum noncoherent FM-DCSK detector: application of chaotic...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： G. Kolumban G. Kis F.C.M. Lau C.K. Tse Department of Measurement and Information Systems Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Department of Electronic and Information Engineering Hong Kong Polytechnic University Kowloon Hong Kong China

A new detector configuration is proposed for the detection of FM-DCSK signals with improved noise performance. Since the new detector configuration is developed directly from the chaotic GML decision rule, it offers the best noise performance in AWGN channel in the category of noncoherent detection if the reception of a single isolated symbol and memoryless modulation scheme is considered. The paper shows how the a priori information on chaotic signals may be exploited in waveform communication to maximize the noise performance.

关键词： Chaos Chaotic communication Additive white noise Gaussian noise Detectors AWGN Bandwidth Signal detection Frequency shift keying Maximum likelihood detection

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A note on the existence of optimal entropy-constrained vector quantizers

A note on the existence of optimal entropy-constrained vecto...

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IEEE International Symposium on Information Theory

作者： A. Gyorgy T. Linder Department of Computer Science and Information Theory Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Department of Mathematics and Statistics Queen's University Kingston Canada

Chou and Betts (1998) showed that for any source distribution with sufficiently light tails the optimal entropy-constrained vector quantizer (ECVQ) has a finite number of code points. This result addressed those optimal vector quantizers that achieve the lower convex hull of the operational distortion-rate function, i.e., quantizers Q that minimize the Lagrangian performance D(Q)+/spl lambda/H(Q) for some /spl lambda/>0, where D(Q) is the quantizer's expected distortion and H(Q) is its output entropy. This Lagrangian optimality criterion also matches the Lloyd-type algorithm used to optimize ECVQs, and corresponds to the fixed-slope approach in variable-rate lossy source coding. The existence of Lagrangian-optimal quantizers, however, was an open question. In this paper we show that optimal ECVQs minimizing the Lagrangian performance always exist under general conditions on the source and the distortion measure. A related result showing the existence of a mean-square optimal ECVQ in the class of regular ECVQs is also presented.

关键词： Lagrangian functions Distortion measurement Entropy Q measurement Computer science Information theory Probability distribution Source coding Random variables Quantization

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NFC Applications and Business Model of the Ecosystem

NFC Applications and Business Model of the Ecosystem

引用

16th IST Mobile and Wireless Communications, vol.3

作者： B. Benyo A. Vilmos K. Kovacs L. Kutor Budapest University슠of슠Technology슠and슠Economics Budapest Hungary SafePay Systems KFT Budapest Hungary Széchenyi István University Gyor Hungary Budapest Polytechnic Budapest Hungary

StoLPaN, a pan-European consortium of companies, universities and user groups co-funded by the European Commission (EU), Information Society Technologies (IST) Programme aims to define open commercial and technical frameworks for the remote management of NFC-enabled services on mobile devices. These frameworks will facilitate the deployment of NFC-enabled mobile applications across a wide range of vertical markets, regardless of the phone type and the nature of the services required. This paper introduces the business aspects of the NFC based service development and the technical infrastructure implementing the core of the NFC-enabled services.

关键词： Mobile communication Near Field Communication (NFC) RFID OTA Software engineering

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Monitoring drivers' vital parameters

Monitoring drivers' vital parameters

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International Symposium on Logistics and Industrial Informatics, LINDI

作者： Péter István Sas László Lukács Adalbert Kovács Endre Borbély Levente Kovács Department of Control Engineering and Information Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Department of Mathematics Polytechnic University of Timisoara Timisoara Romania Óbuda University Budapest Hungary

Accidents are not only caused by poor technical conditions of the vehicles, but also by tired, indisposed, or bad state-of-minded drivers. The managing of human factors needs the control, recording and monitoring of the most important vital parameters of the driver. The paper presents a real-time system, which is based on ECG recording and processing and needs only little cooperation of the driver.

关键词： Vehicles Electrocardiography Monitoring Heart rate variability Biomedical monitoring Educational institutions Bluetooth

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