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检索条件"主题词=change detection algorithms"

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Fast Reliable Multi-Scale Motion Region detection in Video Processing

Fast Reliable Multi-Scale Motion Region Detection in Video P...

引用

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

作者： Jiangbo Lu Gauthier Lafruit Francky Catthoor IMEC Multimedia Group Leuven Belgium Department of Electrical Engineering University of Leuven Belgium

Motion region detection is an important vision topic usually tackled by a background subtraction principle, which has some practical restrictions. We hence propose a multi-scale motion region detection technique that can fast and reliably segment foreground motion regions from two successive video frames. The key idea is to leverage multi-scale structural aggregation to effectively accentuate real motion changes while suppressing trivial noisy changes. Consequently, this technique can be effectively applied to motion region-of-interest (ROI) based video coding. Our experiments show that the proposed algorithm can reliably extract motion regions and is less sensitive to thresholds than single-scale methods. Compared with a H.264/AVC encoder, the proposed semantic video encoder achieves a bitrate saving ratio of up to 34% at the similar video quality, besides an overall speedup factor of 2.6 to 3.6. The motion-ROI detection can process a 352 × 288 size video at 20 fps on an Intel Pentium 4 processor.

关键词： Motion detection Image segmentation Video coding Noise level Signal processing algorithms Object detection Noise reduction Layout change detection algorithms Pixel

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Secret Key Estimation for Image Sequential Steganograph in Transform Domain

Secret Key Estimation for Image Sequential Steganograph in T...

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IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference

作者： Xiangyang Luo Daoshun Wang Ping Wang Fenlin Liu Institute of Information Science and Technology Zhengzhou China Department of Computer Science and Technology Tsinghua University Beijing China

Trivedi et al. presented an effective LMP (locally most powerful) method (2005) to estimate the secret key for sequential steganography in mid- and high-frequency of DCT domain. In this paper, we proposed an improved LMP algorithm, which not only can reliably estimate the secret key for mid- and high-frequency sequential embedding, but also for the case of low-frequency. Moreover, the application of improved algorithm for DWT sequential steganography is discussed. Results of experiment show the performance of improved algorithm is desirable for low-, mid- and high-frequency steganography in DCT domain and in the subbands of DWT domain.

关键词： Steganography Discrete cosine transforms Discrete wavelet transforms Signal to noise ratio Sequential analysis Digital images Spread spectrum communication change detection algorithms Statistics Information science

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Probabilistic Sensor Deployment in Wireless Sensor Network: A New Approach

Probabilistic Sensor Deployment in Wireless Sensor Network: ...

引用

International Conference on Advanced Communication Technology (ICACT)

作者： Md. Obaidur Rahman Md. Abdur Razzaque Choong Seon Hong Networking Lab Department of Computer Engineering Kyung Hee University South Korea

Wireless sensor network has the two major tasks: sensing & detecting of any event over a sensing region. Quality of network coverage entirely depends upon the success of these tasks. Network coverage can be degraded after sensor deployment due to sensor's finite energy. So, it is a decisive task to identify those regions of a network where further deployment of sensor is required to improve the quality of network coverage. Exposure is a probabilistic concept and it determines the probability of detecting any event by the sensors. In this paper we proposed a new approach to find out least covered regions in a sensor network where further sensor deployment is desirable. This approach used some graph-theory based algorithm. In order to improve the network coverage the proposed technique of this paper gives a noticeable performance. The experimental output of the proposed approach is a satisfied one for the improvement quality of network coverage. Moreover in case of sensing or detecting, use of closest sensor of a cluster to a particular point of event makes the overall computation less expensive for the proposed technique.

关键词： Wireless sensor networks Event detection Clustering algorithms Clustering methods Computer networks Electronic mail Degradation change detection algorithms Joining processes Monitoring

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Effectiveness of Hierarchical Heavy Hitter Identification for Intrusion detection

Effectiveness of Hierarchical Heavy Hitter Identification fo...

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IEEE International Conference on Multi Topic

作者： Saba Pervez Uppal Sara Tahir Butt Asim Karim Department of Computer Science Lahore University of Management Sciences Pakistan School of Computer Science Carnegie Mellon University USA

ISBN: (纸本)1424415535;9781424415526

Network traffics volume is employed extensively for monitoring and identification of traffic patterns. A straight forward approach that maintains the volume for all flows and their aggregations is computationally intractable for today's high speed networks. Recently, the online hierarchical heavy hitter algorithm has been proposed for efficient change detection in network streams. We implement the hierarchical heavy hitter identification into an intrusion detection system and evaluate its effectiveness using the DARPA intrusion detection evaluation data sets. Our results show that this approach can be particularly valuable for detecting denial of service attacks and port sweeps. We explore the strengths and weakness of the approach for various attack types.

关键词： Intrusion detection Telecommunication traffic change detection algorithms Computer crime High-speed networks Protocols Computerized monitoring Computer networks Internet Business communication

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Multi-Camera Scene Analysis using an Object-Centric Continuous Distribution Hidden Markov Model

Multi-Camera Scene Analysis using an Object-Centric Continuo...

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IEEE International Conference on Image Processing

作者： Murtaza Taj Andrea Cavallaro Multimedia and Vision Group-Queen Mary University of London UK

We propose a multi-camera event detection framework that can operate on a common ground plane as well as on the image plane. The proposed event detector is based on an object-centric state modeling that uses a continuous distribution hidden Markov model (CDHMM). Video objects are first detected using statistical change detection and then tracked using graph matching. Next, the algorithm recognizes events by estimating the most likely object state sequence using a HMM decoding strategy, based on the Viterbi algorithm. We demonstrate and evaluate the proposed framework on standard event detection datasets with single and multiple cameras, with both overlapping and non-overlapping fields of view.

关键词： Image analysis Hidden Markov models Event detection Object detection Detectors change detection algorithms State estimation Decoding Viterbi algorithm Cameras

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A Hybrid BIST Scheme for Multiple Heterogeneous Embedded Memories

A Hybrid BIST Scheme for Multiple Heterogeneous Embedded Mem...

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The 16th Asian Test Symposium(第十六届亚洲测试学术会议)

作者： Li-Ming Denq Cheng-Wen Wu Department of Electrical Engineering National Tsing Hua University Hsinchu Taiwan 30013

It is common that an SOC contains hundreds or even thousands of heterogeneous embedded memories. Many of these embedded memories have wide data words, leading to high routing penalty from the BIST circuits. Previous BIST schemes solve the problem using serial interface, e. g., based on the IEEE 1500 architecture and novel scan approaches, to reduce the routing area overhead. However, serial approaches do not allow at- speed test and diagnosis, and are very slow. In this paper, we propose a hybrid BIST architecture that reduces the routing penalty, while allowing at-speed test and diagnosis of the memory cores. The test time is close to that of a typical parallel BIST method. Experimental results show that the proposed BIST can effectively reduce the area overhead.

关键词： Built-in self-test Routing Circuit testing Communication system control Random access memory Automatic testing Logic testing Centralized control Fault diagnosis change detection algorithms

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A Novel Normalized Cross-Correlation Based Echo-Path change Detector

A Novel Normalized Cross-Correlation Based Echo-Path Change ...

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IEEE Region 5 Annual Technical Conference

作者： Mohammad Asif Iqbal Steven L. Grant University of Missouri Rolla Rolla MO USA

A double-talk detector is used to freeze acoustic echo canceller's (AEC) filter adaptation during periods of near-end speech. Increased sensitivity towards double-talk results in declaring echo-path changes as double-talk which adversely effects the performance of an AEC as we freeze adaptation when we really need to adapt. Thus, we need an efficient and simple echo-path change detector so as to differentiate any echo-path variations from double-talk condition. In this paper, we derive a novel test statistic for echo-path change detection. The proposed decision statistic detects any echo-path variations, is normalized properly and is computationally very efficient as compared to existing techniques. Simulations demonstrate the efficiency of the proposed algorithm.

关键词： Detectors Speech Acoustic signal detection Adaptive filters Microphones Statistics change detection algorithms Echo cancellers Signal synthesis Testing

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Research on Network Traffic Anomaly detection Algorithm

Research on Network Traffic Anomaly Detection Algorithm

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IEEE Symposium on Computers and Communications (ISCC)

作者： Jun Lv Tong Li Xing Li Academy of Armored Forces Engineering Beijing China China Education and Research Network Tsinghua University Beijing China

Network traffic anomaly detection is a difficult problem in network management. This paper proposed the wavelet generalized likelihood ratio WGLR) algorithm and the error performance detection (EPD) algorithm to solve this problem. The WGLR algorithm combines the generalized likelihood ratio (CLR) algorithm and the Wavelet transform method, and has an advantage of less computation cost. The EPD algorithm, which is based on the prediction error of the traffic model, will detect the anomalous change in the signal without test window delay. Simulating and network traffic experimental results show that the new algorithm has the better performance in network traffic anomaly detection.

关键词： Telecommunication traffic detection algorithms change detection algorithms Traffic control Computer network management Wavelet transforms Computational efficiency Predictive models Testing Delay

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Binary Document Images Authentication by Thinning Digital Patterns

Binary Document Images Authentication by Thinning Digital Pa...

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International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIHMSP)

作者： Chu-Hsing Lin Wen-Kui Chang Yu-Ying Lin Lun-Yuen Cheng Department of Computer Science and Information Engineering Tunghai University Taichung Taiwan

ISBN: (纸本)9780769529943;0769529941

As most documents have been digitized and transmitted over the Internet, it becomes very crucial to protect the integrity of them. Integrity is the process of ensuring that a document is changed by unauthorized users. In this paper, inspired by the Yang and Kot's method, we proposed a novel scheme to verify the integrity of binary documents by using its digital patterns. We compute the black patterns and white patterns of a document and embed watermark information in it. The experimental result shows that by using our proposed method one can verify the integrity of a digital document, any little change made to it can be detected easily.

关键词： Authentication Watermarking Protection Internet Embedded computing Handheld computers Cryptography Payloads Computer science change detection algorithms

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Audiovisual Tracking Using STAC Sensors

Audiovisual Tracking Using STAC Sensors

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ACM/IEEE International Conference on Distributed Smart Cameras, ICDSC

作者： Huiyu Zhou Murtaza Taj Andrea Cavallaro Multimedia and Vision Group Queen Mary University of London London UK

In this paper we present an audiovisual tracking algorithm using a stereo audio and cycloptic vision (STAC) sensor. A STAC sensor is composed of a single camera mounted between two microphones. Target localization is performed using color-based change detection in the video modality and on estimation of time difference of arrival (TDOA) between the two microphones in the audio modality. The TDOA is computed by means of a multi-band generalized cross correlation (GCC) analysis. The estimated directions of arrival are then ltered using a Riccati Kalman Iter . The visual and audio estimates are nally integrated, at likelihood level, into a particle Iter that uses a zero-order motion model. We demonstrate that the Kalman ltering improves the accuracy of the audio source localization and sensor fusion with particle ltering under image occlusions. We also demonstrate the proposed audiovisual tracker to generate metadata for very low bitrate teleconferencing.

关键词： Target tracking Microphones Kalman filters change detection algorithms Cameras Time difference of arrival Direction of arrival estimation Riccati equations Motion estimation Sensor fusion

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