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Adaptive rule-based recognition of events in video sequences

Adaptive rule-based recognition of events in video sequences

引用

IEEE International Conference on image processing

作者： V. Tzouvaras G. Tsechpenakis G. Stamou S. Kollias Image Video and Multimedia Laboratory School of Electrical and Computer Engineering National and Technical University of Athens Greece

Knowledge-based fuzzy inference and neural learning are used in this paper in order to model the event recognition task in semantic video analysis. The advantage of their use is the symbolic nature of the representation of the knowledge concerning the events to be recognized. Moreover, this knowledge can be adapted with the aid of data taken from video sequences. The proposed system has been tested in soccer video sequences for detecting some complex predetermined (and represented in the form of rules) events.

关键词： video sequences Fuzzy sets Fuzzy systems Event detection Data mining Character recognition Robustness Artificial neural networks Hybrid intelligent systems Object detection

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A discussion of leaky prediction based scalable coding

A discussion of leaky prediction based scalable coding

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： Yuxin Liu Zhen Li P. Salama E.J. Delp Video and Image Processing Laboratory (VZPER) School of Electrical and Computer Engineering Purdue University West Lafayette IN USA Department of Electrical and Computer Engineering Indiana University-Purdue University Indianapolis Indianapolis IN USA

In this paper, we focus on the leaky prediction based scalable coding (LPSC) structure and present a general framework for LPSC. We demonstrate the similarity between LPSC and motion compensation based multiple description coding scheme. We show that since the information contained in the enhancement layer in LPSC is actually a mismatch between two descriptions for each frame, it cannot be guaranteed that the enhancement layer always achieves superior reconstruction quality beyond that achieved by the base layer. We derive three reconstructions for each frame under the LPSC framework, and propose a maximum-likelihood (ML) estimation scheme for LPSC video reconstruction at the decoder. This generally achieves superior decoded video quality than both the enhancement layer and the base layer.

关键词： image coding image reconstruction Decoding Protection Motion compensation Streaming media Scalability Robustness Forward error correction computer errors

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Object tracking in clutter and partial occlusion through rule-driven utilization of Snakes

Object tracking in clutter and partial occlusion through rul...

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： G. Tsechpenakis K. Rapatzikos N. Tsapatsoulis S. Kollias Image Video and Multimedia Systems Laboratory School of Electrical and Computer Engineering National and Technical University of Athens Athens Greece

Efficient moving object tracking in cases of partial occlusion is a challenging task for the researchers in the fields of computer vision and video processing. In modern coding standards, like MPEG-4 and MPEG-7, the term of video objects is used to define moving objects in a video sequence. Automatic extraction of such objects is by no means trivial, and occlusion is one of the most important problems. This paper reformulates one of the most popular deformable templates for shape modeling and object tracking, the Snakes, in a probabilistic manner, in order to include providence for partial occlusion of the moving objects. Experiments of object tracking in partial occlusion, in complex natural sequences, where temporal clutter, abrupt motion and external lightning changes have been carried out, showing the efficiency of the proposed approach.

关键词： Shape video sequences Tracking Active contours computer vision History Multimedia systems Laboratories Modems MPEG 4 Standard

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Evaluation of joint source and channel coding over wireless networks

Evaluation of joint source and channel coding over wireless ...

引用

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

作者： Yuxin Liu C. Podilchuk E. Delp Video and Image Processing Laboratory (VIPER) School of Electrical and Computer Engineering Pwdue University West Lafayette IN USA Multimedia Research Laboratory Bell Laboratories Lucent Technologies Inc. Murray Hill NJ USA

Transmission of digital video signals over wireless networks demands efficient compression algorithms as well as reliable coding strategies. In this project, we provide a thorough evaluation of the joint source-channel video coding methodology from two points of view: source coding design for error resilience and channel coding for error detection and recovery. We investigate the current ITU video compression standard, H.263+, for 3G wireless transmission. In particular, we concentrate on error resilient features provided within the standard and forward error correction (FEC) to find the optimal combination of various system parameters under different lossy channel conditions.

关键词： Wireless networks Forward error correction Error correction video compression Resilience Channel coding image coding Laboratories Source coding Error correction codes

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New channels for carrying copyright and usage rights data in digital multimedia distribution

New channels for carrying copyright and usage rights data in...

引用

International Conference on Information Technology: Research and Education (ITRE)

作者： A.M. Eskicioglu E.J. Delp M.R. Eskicioglu Brooklyn College City University of New York Brooklyn NY USA Video and Image Processing Laboratory (VIPER) School of Electrical and Computer Engineering Purdue University West Lafayette IN USA Department of Computer Science University of Manitoba Winnipeg MAN Canada

Protection of intellectual property is a critical issue in digital multimedia distribution systems. Cryptographic tools are commonly used for secure delivery of content and access keys to consumers via terrestrial, satellite, cable and Internet transmissions. A third requirement is the distribution of the copyright or usage rights associated with the digital content. The integrity, as opposed to security, of this data is essential to prevent unauthorized modification. Two approaches have been proposed in the open literature: allocating special fields in the transport stream and embedding a watermark into multimedia content. We present two new methods, based on secret sharing, to create channels with guaranteed data integrity.

关键词： Cryptography Streaming media Protection Intellectual property Multimedia systems Satellites Power cables Internet Data security Watermarking

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Analysis of the performance of predictive SNR scalable coders

Analysis of the performance of predictive SNR scalable coder...

引用

IEEE International Conference on image processing

作者： J. Prades-Nebot G.W. Cook Grupo de Tratamiento de Senal (GTS) Departamento de Comunicaciones Universidad Politécnica de Valencia Valencia Spain Video and Image Processing Laboratory (VIPER) School of Electrical and Computer Engineering Purdue University West Lafayette IN USA

In this paper, we present an analysis of the performance of three predictive fine granular SNR-scalable coders and compare them with their non-scalable version. In our study, we assume an exponential model for the quantization noise and the use of linear prediction. Coders efficiency is assessed through the signal-to-noise ratio as a function of rate (SNR(R)) and the mean SNR. Validity of our analysis is tested by comparing theoretical results with simulations of the encoding of realizations of first order autoregressive processes. Results show that the use of coders which tolerate some prediction drift provides better results than other conventional scalable schemes.

关键词： Performance analysis Decoding image coding Signal to noise ratio Quantization Transmitters Encoding Signal processing Additive white noise Predictive models

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Towards supporting the teaching of history using an intelligent information system that relies on the electronic road metaphor

Towards supporting the teaching of history using an intellig...

引用

International Conference on Advanced Learning Technologies (ICALT)

作者： M. Wallace M. Stefanou K. Karpouzis S. Kollias Image Video and Multimedia Systems Laboratory Department of Electrical and Computer Engineering National and Technical University of Athens Greece Faculty of History and Archaeology School of Philosophy National and Kapodistrian University of Athens Greece

The new educational system in Greece, as far as teaching of history is concerned, is characterized by a shift away from sterile memorization and towards a critical approach of historical facts and phenomena that would contribute in both the development of pupils' historical concept and conscience and the promotion of critical thought. This reflects the globally accepted goals of teaching history courses. Such teaching goals can be greatly supported by computer-based applications, which can offer access to vast amounts of historical texts and data to be used next to the main scholar textbook and be analyzed by pupils. Still, existing applications seem to be quite inadequate for this purpose, as they require that the pupil be already informed on a matter, before the initiation of a quest for data. We describe an intelligent information system that is designed to facilitate browsing of educational material and historical sources, thus allowing pupils to efficiently retrieve information on topics that are not yet known to them and expand in this way their historical knowledge. This can help in fulfilling the teaching goals of the new educational system.

关键词： Education History Intelligent systems Information systems Application software Roads Multimedia systems Laboratories computer applications Information retrieval

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Automatic face region tracking for highly accurate face recognition in unconstrained environments

Automatic face region tracking for highly accurate face reco...

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IEEE Conference on Advanced video and Signal Based Surveillance (AVSS)

作者： Y.-O. Kim J. Paik Jingu Heo A. Koschan B. Abidi M. Abidi Korea Electronics and Technology Institute Puchon Gyeonggi South Korea Image Processing Laboratory Department of Image Engineering Graduate School of Advanced Imaging Science Multimedia and Film Chung-Ang University Seoul South Korea Imaging Robotics and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Tennessee Knoxville USA

We present a combined real-time face region tracking and highly accurate face recognition technique for an intelligent surveillance system. High-resolution face images are very important to achieving accurate identification of a human face. Conventional surveillance or security systems, however, usually provide poor image quality because they use only fixed cameras to record scenes passively. We have implemented a real-time surveillance system that tracks a moving face using four pan-tilt-zoom (PTZ) cameras. While tracking, the region-of-interest (ROI) can be obtained by using a low-pass filter and background subtraction with the PTZ. Color information in the ROI is updated to extract features for optimal tracking and zooming. FaceIt/sup /spl reg//, which is one of the most popular face recognition software packages, is evaluated and then used to recognize the faces from the video signal. Experimentation with real human faces showed highly acceptable results in the sense of both accuracy and computational efficiency.

关键词： Face recognition Surveillance Real time systems Humans Cameras Intelligent systems Security image quality Layout Low pass filters

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3-D Bayesian ultrasound breast image segmentation using the EM/MPM algorithm

3-D Bayesian ultrasound breast image segmentation using the ...

引用

IEEE International Symposium on Biomedical Imaging, ISBI 2002

作者： Christopher, Lauren A. Delp, Edward J. Meyer, Charles R. Carson, Paul L. Purdue University Video and Image Processing Laboratory Schooi of Electrical and Computer Engineering West LafayetteIN47907 United States University of Michigan Department of Radiology Ann ArborMI48109 United States

ISBN: (纸本)078037584X

In this paper, ultrasound breast image segmentation is improved by using the volumetric data available in neighboring slices. The new algorithm extends the EM/MPM framework to 3D by including pixels from neighboring frames in the Markov Random Field (MRF) clique. In addition, this paper describes a unique linear cost factor introduced in the optimization loop to compensate for the attenuation common to ultrasound images. © 2002 IEEE.

关键词： image segmentation

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A comparison of fixed-point 2D 9/spl times/7 discrete wavelet transform implementations

A comparison of fixed-point 2D 9/spl times/7 discrete wavele...

引用

IEEE International Conference on image processing

作者： Hyung Cook Kim E.J. Delp Video and Image Processing Laboratory School of Electrical and Computer Engineering Purdue University West Lafayette IN USA

We describe three 2D discrete wavelet transform fixed-point implementations and compare them in terms of quantization error for the Daubechies 9/spl times/7 filter bank. The three implementations are the polyphase form, lifting scheme, and reduced scaling lifting scheme. Experimental results show that the reduced scaling lifting scheme is more robust than the other schemes. Also, the number of cycles the implementations take on a Texas Instruments TMS320C6201 simulator are given as reference.

关键词： Discrete wavelet transforms Digital signal processing Quantization Computational efficiency Low pass filters Filter bank Instruments image processing Laboratories Robustness

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