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检索条件"主题词=Change Detection Algorithms"

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Algorithm and architecture of video segmentation hardware system with a programmable PE array

Algorithm and architecture of video segmentation hardware sy...

引用

IEEE Workshop on Signal Processing Systems (SIPS)

作者： Shao-Yi Chien Yu-Wen Huang Bing-Yu Hsieh Liang-Gee Chen Department of Electrical Engineering National Taiwan University Taipei Taiwan

ISBN: (纸本)0780375874

Video segmentation is a key unit in content-based video encoding systems, such as MPEG-4. Existing algorithms are too complex for real-time applications, and hardware implementation is infeasible because of the global and irregular operations. In this paper, a hardware system for video segmentation is proposed from algorithm level to hardware architecture level. A hardware-oriented algorithm is first proposed to generate accurate object masks with local pixel operations and morphological operations, which are suitable for hardware implementation. After that, the hardware architecture is designed based on partial-result-reuse architecture and programmable morphology PE array architecture, which can achieve both high flexibility and throughput. A prototype chip is implemented to achieve the processing speed of 30 QCIF frames per second and 7,680 morphological operations per second at 26 MHz. It also shows the hardware cost is small, and the proposed video segmentation hardware system is suitable to be integrated into any content-based video encoding systems.

关键词： Hardware MPEG 4 Standard change detection algorithms Encoding Image segmentation Morphological operations Morphology Throughput Real time systems Algorithm design and analysis

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Simulation models of TBM's echo and its signal processing algorithms

Simulation models of TBM's echo and its signal processing al...

引用

International Conference on Microwaves, Radar and Wireless Communications

作者： T. Brenner J. Goca W. Komorniczak Cz. Lesnik A. Modrzewski J. Pietrasinski Faculty of Electronics Institute of Radar Teclmology Military University of Technology Warsaw Poland

Difficulties concerning the detection of TBMs result from their radial speed, which is higher than a fighter's, and radar cross section (RCS) value, which is lower than a fighter's, so that fluctuations are very complicated. Signal processing algorithms relating radar echoes from TBMs in radar with stacked receiving beams are described. Moreover, a simulation model of such echoes is considered. On the basis of these models, introductory research results are presented (see Brenner, T. et al., ibid., p.773-7).

关键词： Signal processing algorithms Radar detection Statistics Radar cross section Azimuth Fluctuations Radar signal processing Radar antennas change detection algorithms Trajectory

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Controlling a gas/odor plume-tracking robot based on transient responses of gas sensors

Controlling a gas/odor plume-tracking robot based on transie...

引用

IEEE SENSORS

作者： H. Ishida G. Nakayama T. Nakamoto T. Moriizumi Department of Physical Electronics Tokyo Institute of Technology Tokyo Japan

Gas sensors provide the artificial sense of smell for a mobile robot to track an airborne gas/odor plume and to locate its source. However, a slow response of gas sensors has been the major factor limiting the development of plume-tracking robots. This paper describes a new control algorithm that overcomes the limitation. The basic idea is to detect the onset of a gas sensor response and start recovery by monitoring the relative change in each sensor output. Fast plume tracking is accomplished by making the robot take appropriate actions immediately when the sensor outputs start changing from one state to another. The detection of output change also leads to reliable plume detection and comparison of multiple sensor outputs since it is less affected by drift or sensitivity mismatch than the previous algorithm based on the absolute levels of sensor outputs. Experimental results have shown that the robot can track down a gas source within the distance of 2 m in 30 s even though semiconductor gas sensors with a long recovery time (> 60 s) are used.

关键词： Robot sensing systems Gas detectors Mobile robots change detection algorithms Signal processing algorithms Monitoring Oceans Animals Navigation Chemical hazards

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A comparative study of QoS routing schemes that tolerate imprecise state information

A comparative study of QoS routing schemes that tolerate imp...

引用

International Conference on Computer Communications and Networks (ICCCN)

作者： Xin Yuan Wei Zheng Shiling Ding Department of Computer Science Florida State University Tallahassee FL USA

ISBN: (纸本)078037553X

In large networks, maintaining precise global network state information is almost impossible. Many factors, including non-negligible propagation delay, infrequent link state update due to overhead concerns, link state update policy, resource reservation, and hierarchical topology aggregation, have impacts on the precision of the global network state information. To achieve efficient quality of service (QoS) routing, a practical routing algorithm must be able to make effective routing decisions in the presence of imprecise global network state information. In this paper, we compare five QoS routing algorithms that were proposed to tolerate imprecise global network state information, safety-based routing, randomized routing, multi-path routing, localized routing, and static multi-path routing. The performance of these routing algorithms are evaluated under two link state update policies, the timer based policy and the threshold based policy. The strengths and limitations of each scheme are identified.

关键词： Routing Quality of service change detection algorithms Propagation delay Maintenance Computer science Network topology Degradation Probes

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A robust phase-reversed tone detection using bispectrum and DFT-based algorithms

A robust phase-reversed tone detection using bispectrum and ...

引用

International Conference on Signal Processing Proceedings (ICSP)

作者： V. Bhatia A. De A. Gupta S. Senger Netaji Subhas Institute of Technology India Hughes Software Systems Limited India

This article proposes a novel method and apparatus to determine phase-reversal in a tone corrupted by additive white Gaussian noise. The technique presented here uses time-domain as well as frequency-domain based algorithms for proper estimation of phase change in disabling-tone signal. In this technique, instance of the phase-reversal is detected by a time domain algorithm. This is followed by estimation of the phase by a frequency-domain algorithm using bispectrum and DFT-based approaches. The proposed technique is tested for robustness after optimization of various parameters governing performance of the designs. Both, the bispectrum and DFT-based designs are able to detect successfully the presence of phase-reversed tone signal under noise.

关键词： Phase detection change detection algorithms Noise robustness Frequency estimation Phase estimation Additive white noise Time domain analysis Testing Design optimization Signal design

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Multi-layered videotext extraction method

Multi-layered videotext extraction method

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IEEE International Conference on Multimedia and Expo (ICME)

作者： L. Agnihotri N. Dimitrova M. Soletic Philips Research USA Briarcliff Manor NY USA Philips Semiconductors Monza Italy

The importance of video content analysis and retrieval increases as storage capacity grows in consumer devices. Videotext detection is very important for video indexing and retrieval enabling features such as commercial detection, intelligent keyframe extraction, program boundary detection and others. In this paper we propose multi-layered videotext detection tailored to an MP EG encoding scheme. We approached the videotext detection from a perspective of scalability and flexibility for different platforms with varying resources. We propose a three-layered algorithm. The first layer works in compressed domain features such as macroblock type. The second layer works in semicompressed domain such as DCT coefficients. The third layer works in uncompressed domain, i.e. spatial domain. As the next layer gets implemented the complexity increases but so does the precision of the algorithm. On constrained platforms, only the first layer would be implemented. On high-end platforms all three layers could be implemented to enable a full suite of indexing and retrieval applications.

关键词： Indexing Algorithm design and analysis change detection algorithms Layout Face detection Performance analysis Image color analysis Content based retrieval Transform coding Encoding

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Performance evaluation of scene change detection algorithms

Performance evaluation of scene change detection algorithms

引用

Asia-Pacific Conference on Communications

作者： Jong Whan Jang Il Kyun Oh Department of Information and Communication Engineering Pai Chai University Taejon South Korea

ISBN: (纸本)7563504028

Scene change detection algorithms become the key issues especially for video information in many digital video applications such as digital libraries and video servers. The accuracy and execution speed of the scene change detection algorithm is critical if large amounts of video data are to be processed. In this paper, we discuss the performance of the three previous proposed methods and present a new algorithm to use the histogram difference of DC images incorporating the HVS (human visual system) for fast and accurate detection. The simulation results are also presented for two test video sequences, commercials and news, to show that the proposed algorithm works better than the previous ones.

关键词： Layout detection algorithms Video sequences change detection algorithms Video on demand Video compression Information retrieval Histograms Decoding Computational efficiency

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Speaker change detection and speaker clustering using VQ distortion for broadcast news speech recognition

Speaker change detection and speaker clustering using VQ dis...

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

作者： K. Mori S. Nakagawa Department of Information and Computer Sciences Toyohashi University of Technology Toyohashi Aichi Japan

Addresses the problem of the detection of speaker changes and clustering speakers when no information is available regarding speaker classes or even the total number of classes. We assume that no previous information on speakers is available (no speaker model, no training phase) and that people do not speak simultaneously. The aim is to apply speaker grouping information to speaker adaptation for speech recognition. We use vector quantization (VQ) distortion as the criterion. A speaker model is created from successive utterances as a codebook by a VQ algorithm, and the VQ distortion is calculated between the model and an utterance. A result was obtained by the experiment on speaker detection and speaker clustering. The speaker change detection experiment was compared with results by generalized likelihood ratio and Bayesian information criterion. We show the superiority of our proposed method.

关键词： Broadcasting Loudspeakers Speech recognition Acoustic distortion Broadcast technology Magnetooptic recording Vector quantization change detection algorithms Clustering algorithms Bayesian methods

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Robust change detection by fusing intensity and texture differences

Robust change detection by fusing intensity and texture diff...

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Conference on Computer Vision and Pattern Recognition (CVPR)

作者： Liyuan Li M.K.H. Leung KRDL RWCP Multi Modal Functions Laboratory Singapore Singapore School of Computer Engineering Nanyang technological University Singapore Singapore

ISBN: (纸本)0769512720

The paper proposes a novel technique for robust change detection based upon the integration of intensity and texture differences between two frames. A new texture difference measure based on the relations between gradient vectors is described. The robustness of the measure with respect to noise and illumination changes has been analyzed. Two ways to integrate the intensity and texture differences are proposed. The first combines two measures according to the weightage of texture evidence, while the second takes into additional constraint of smoothness. The parameters of the algorithm are selected automatically. The computational complexity analysis indicates that the proposed technique can run in real-time. Experimental results show that by exploiting both intensity and texture differences for change detection, one can obtain much better segmentation results than using the intensity or structure difference alone.

关键词： Lighting Noise robustness Image edge detection Motion detection Background noise Noise level Statistical distributions Noise measurement change detection algorithms Computational complexity

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Matrix CUSUM: a recursive multi-hypothesis change detection algorithm

Matrix CUSUM: a recursive multi-hypothesis change detection ...

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IEEE International Symposium on Information Theory

作者： T. Oskiper H.V. Poor Department of Electrical Engineering Princeton University Princeton NJ USA

A new recursive M-ary change detection algorithm is described.

ISBN: (纸本)0780371232

A new recursive M-ary change detection algorithm is described.

关键词： detection algorithms Iron Distribution functions change detection algorithms Delay Random variables Algorithm design and analysis Minimax techniques Statistical distributions Density functional theory

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