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检索条件"机构=Video and Image Processing Laboratory School of Electrical and Computer Engineering"

共 374 条记录，以下是311-320 订阅

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

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

引用

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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Normal mammogram classification based on regional analysis

Normal mammogram classification based on regional analysis

引用

2002 45th Midwest Symposium on Circuits and Systems

作者： Sun, Yajie Babbs, Charles F. Delp, Edward J. Video/Image Processing Laboratory Sch. of Elec./Computer Engineering Purdue University West Lafayette IN 47907-1285 United States Department of Basic Medical Sciences School of Veterinary Medicine Purdue University West Lafayette IN 47907-1246 United States

The majority of screening mammograms are normal. It will be beneficial if a detection system is designed to help radiologists readily identify normal regions of mammograms. In this paper, we will present a binary tree classifier based on the use of global features extracted from different levels of a 2-D Quincunx wavelet decomposition of normal and abnormal regional images. This classifier is then used to classify whether an entire whole-field mammogram is normal. This approach is fundamentally different from other approaches that identify a particular abnormality in that is independent of the particular type of abnormality.

关键词： Mammography

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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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Normal mammogram classification based on regional analysis

Normal mammogram classification based on regional analysis

引用

Midwest Symposium on Circuits and Systems (MWSCAS)

作者： Yajie Sun C.F. Babbs E.J. Delp Video and Image Processing Laboratory School of Electrical and Computer Engineering Purdue University West Lafayette IN USA Department of Basic Medical Sciences School of Veterinary Medicine Purdue University West Lafayette IN USA

关键词： Feature extraction Cancer detection Classification tree analysis Mammography Lesions Biomedical imaging Decision trees image databases Sun image processing

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A recursive shape error concealment algorithm

A recursive shape error concealment algorithm

引用

IEEE International Conference on image processing

作者： Xiaohuan Li A.K. Katsaggelos G.M. Schuster Image and Video Processing Laboratory Department of Electrical and Computer Engineering Northwestern University Evanston IL USA Abteilung Ekktechnik Hochschule für Technik Rapperswil Switzerland

The encoding of shape information is a distinguishing feature of MPEG-4. In error prone communication networks, it is important and efficient to conceal shape errors spatially, so as to avoid propagation of errors in the video frames. The proposed system first defines the missing area's four rectangular neighbors. It then detects in the neighbors the lines that intersect the borders and redefines them in a geometric coordinate system. These lines are paired under some optimization objective so that they connect smoothly in the missing area. Each pair is extrapolated and corrected recursively until a close curve is formed. Test results on various sequences under various error rates are presented and compared with other shape concealment methods.

关键词： Shape computer errors Decoding Streaming media Motion compensation image coding MPEG 4 Standard Laboratories Communication networks Testing

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An optimal shape encoding scheme using skeleton decomposition

An optimal shape encoding scheme using skeleton decompositio...

引用

IEEE Workshop on Multimedia Signal processing

作者： Haohong Wang G.M. Schuster A.K. Katsaggelos T.N. Pappas Image and Video Processing Laboratory Department of Electrical and Computer Engineering NorthWestern University Evanston IL USA Abteilung Elektrotechnik Hochschnle für Technik und Wirtschaft Rapperswil Switzerland

This paper presents an operational rate-distortion (ORD) optimal approach for skeleton-based boundary encoding. The boundary information is first decomposed into skeleton and distance signals, by which a more efficient representation of the original boundary results. Curves of arbitrary order are utilized for approximating the skeleton and distance signals. For a given bit budget for a video frame, we solve the problem of choosing the number and location of the control points for all skeleton and distance signals and for all boundaries within a frame, so that the overall distortion is minimized. The problem is solved with the use of Lagrangian relaxation and a shortest path algorithm in a 4D directed acyclic graph (DAG) we propose. By defining a path selection pattern, we reduce the computational complexity of the 4D DAG shortest path algorithm from O(N/sup -5/) to O(N/sup -4/), where N is the number of admissible control points for a skeleton. A suboptimal solution is also presented for further reducing the computational complexity of the algorithm to O(N/sup -2/). The proposed algorithm outperforms experimentally other competing algorithms.

关键词： Encoding Skeleton Lagrangian functions Computational complexity MPEG 4 Standard Shape control Approximation error image coding Distortion Standardization

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Transmit power allocation for an extended V-BLAST system

Transmit power allocation for an extended V-BLAST system

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Seung Hoon Nam Kwang Bok Lee Pattern Recognition and Image Processing Laboratory Samsung Advanced Institute of Science and Technology Suwon South Korea School of Electrical Engineering and Computer Science Seoul National University Seoul South Korea

ISBN: (纸本)0780375890

Vertical Bell Laboratories Layered Space-Time (V-BLAST) is a promising system that realizes the enormous capacity of multiple-input multiple-output (MIMO) communications. We present an extension of V-BLAST, and propose an effective transmit power allocation scheme for the extended system. The proposed transmit power allocation scheme minimizes the bit error rate (BER) averaged over all detection stages, and requires small feedback overhead from the receiver to the transmitter. Simulation results show that the extended V-BLAST system with the proposed transmit power allocation scheme provides a significant reduction in the BER compared to the conventional V-BLAST system. When the minimum mean square error (MMSE) nulling is adopted, the extended V-BLAST system is found to achieve the BER performance comparable to that of the maximum likelihood (ML) detection for the conventional V-BLAST architecture.

关键词： Bit error rate MIMO Feedback Transmitters Maximum likelihood detection Transmitting antennas Space technology computer science Mean square error methods Information theory

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Text scanner with text detection technology on image sequences

Text scanner with text detection technology on image sequenc...

引用

International Conference on Pattern Recognition

作者： Keechul Jung Kwang In Kim T. Kurata M. Kourogi JungHyun Han Pattern Recognition and Image Processing Laboratory Michigan State University USA Artificial Intelligence Laboratory KAIST South Korea National Institute for Advanced Industrial Science and Technology Japan School of Electrical and Computer Engineering Sung Kyun Kwan University South Korea

ISBN: (纸本)076951695X

We propose a text scanner which detects wide text strings in a sequence of scene images. For scene text detection, we use a multiple-CAMShift algorithm on a text probability image produced by a multi-layer perceptron. To provide enhanced resolution of the extracted text images, we perform the text detection process after generating a mosaic image in a fast and robust image registration method.

关键词： image sequences Layout image registration Cameras Parameter estimation videos Pixel image processing Robustness Optical character recognition software

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A rate-distortion optimal video pre-processing algorithm

A rate-distortion optimal video pre-processing algorithm

引用

IEEE International Conference on image processing

作者： P.V. Karunaratne C.A. Segall A.K. Katsaggelos Image and Video Processing Laboratory Department of Electrical and Computer Engineering Northwestern University Evanston IL USA

Pre-processing algorithms improve the quality of a compression system by removing unimportant data before encoding. This enhances both the visual quality and coding efficiency of the system. We cast the pre-processing problem in the operational rate-distortion framework. Filtering the displaced frame difference is the focus, and the proposed method couples the choice of the quantization scale to the response of the prefilter. Coding errors are then addressed by penalizing significant differences between coded blocks. Finally, experimental results illustrate the efficacy of the method within the context of an MPEG-2 coding scenario.

关键词： Rate-distortion Low pass filters image coding Decoding Transform coding video compression Focusing image quality Filtering algorithms image sequences

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