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A discussion of leaky prediction based scalable coding

A discussion of leaky prediction based scalable coding

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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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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...

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

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

引用

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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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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Significance of intracranial pressure pulse morphology in pediatric traumatc brain injury

Significance of intracranial pressure pulse morphology in pe...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： M. Aboy J. McNames D. Cuesta-Frau W. Wakeland T. Thong S. Lai B. Goldstein Biomedical Signal Processing Laboratory Electrical and Computer Engineering Portland State University Portland OR USA Computer Vision Group ETS-Alcoi Polytechnic University of Valencia Spain Systems Science Ph.D. Program Portland State University Portland OR USA Biomedical Engineering OGI School of Science and Engineering Oregon Health and Sciences University Portland OR USA Complex Systems Laboratory Department of Pediatrics Oregon Health and Sciences University Portland OR USA

We investigated the relationship between the intracranial pulse pressure (ICP/sub PP/) and the mean intracranial pressure (ICP/sub M/). In adult patients, several research groups have described a linear relationship between ICP/sub PP/ and ICP/sub M/ within the range of cerebral autoregulation. Current monitoring and therapy are mainly based on the mean ICP/sub M/, since it is believed that the ICP/sub M/ contains most of the information provided by the other pulse morphology metrics. In this paper we attempt to answer whether there is further information within the ICP morphology not explained by ICP/sub M/ that might be of prognostic significance. We screened ICP records of 42 patients admitted to the Pediatric Intensive Care Unit at Doernbecher Children's Hospital for segments in which the ICP/sub M/ varied at least 5 mmHg during a 1-hour period. We found 54 segments in 9 different pediatric TBI patients (ages 0.2-17.8 years, mean=9.9 years). ICP/sub PP/ and ICP/sub M/ were calculated for each pulse using an automatic pressure detection algorithm. The coefficient of linear correlation r was > 0.70 in 43/54 segments (p < 0.001), which indicates that there exists a linear relationship between ICP/sub PP/ and ICP/sub M/. However, we found r > 0.90 only in 16/54 segments (p=NS) . This result and visual inspection of ICP/sub PP/ vs. ICP/sub M/ density plots suggest that ICP pulse pressure is not fully explained by the ICP M.

关键词： Cranial pressure Morphology Brain injuries Iterative closest point algorithm Pediatrics Patient monitoring Medical treatment Hospitals Detection algorithms Inspection

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A new video watermarking protocol

A new video watermarking protocol

引用

Midwest Symposium on Circuits and Systems (MWSCAS)

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

This paper overviews the problems with temporal synchronization in video watermarking and describes a new approach for efficient synchronization and resynchronization. A complete version of the new method has been pre... 详细信息

关键词： Watermarking Protocols Detectors Signal processing Robustness Streaming media image processing Laboratories Digital TV Digital video broadcasting

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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...

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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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Error resilience of video transmission by rate-distortion optimization and adaptive packetization

Error resilience of video transmission by rate-distortion op...

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IEEE International Conference on Multimedia and Expo (ICME)

作者： Yuxin Liu P. Salama E. Delp Video and Image Processing Laboratory (VIPER) 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

We propose new schemes to introduce error resilience into the compressed video bitstreams for transmission over packet networks. First, we develop an adaptive packetization scheme that prohibits any dependency across packets, for error resilience purposes, while exploiting the dependency within each packet to improve the source coding performance. Secondly, we address a two-layer rate-distortion optimization scheme to serve our packetization method. We also use forward error correction (FEC) coding across packets to provide further error protection. Finally, we present a simplified version of our schemes to make it fully compliant with the current ITU video coding standard - H.263+.

关键词： Resilience Rate-distortion image coding Video compression computer errors Propagation losses Motion estimation Forward error correction Video coding Streaming media

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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

作者： L.A. Christopher E.J. Delp C.R. Meyer P.L. Carson Video and Image Processing Laboratory School of Electrical and Computer Engineering Purdue University West Lafayette IN USA Department of Radiology University of Michigan Ann Arbor MI USA

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.

关键词： Bayesian methods Ultrasonic imaging Breast image segmentation Markov random fields Magnetic resonance imaging Acoustic noise image processing Cost function Attenuation

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