Distributed Image and Video Processing:

Directed Graphs, Bayesian Estimation, and Hidden Markov Models

报告时间：2007年5月16日上午10点

报告地点：信电楼4楼学术报告厅

报告人：Dan Schonfeld教授，美国伊利诺大学芝加哥校区电子与计算机工程系多媒体通信实验室的Co-Director

Traditional image and video processing algorithm are centralized. They rely on an implementation on a large server for efficient processing. However, with the emergence of large camera networks, we must design distributed algorithms that can scale with the size of the network and number of targets. In this talk, we present a general methodology to the design of distributed image and video processing system. The premise of our approach to distributed processing is the graphical decomposition of complex dynamical systems. We provide a distributed Bayesian approach to multi-object tracking and multi-camera tracking. Implementation of the proposed approach to distributed Bayesian tracking is achieved using a particle filtering framework. In this framework, multiple particle filters associated with individual targets and cameras collaborate to obtain the joint Bayesian estimate. We subsequently present a distributed multi-dimensional hidden Markov model (HMM). A complex non-casual multi-dimensional HMM is characterized by multiple distributed causal HMMs. The training and classification algorithms of the causal HMMs are derived by extension of the expectation-maximization (EM), general forward-backward (GFB), and Viberbi algorithms to multi-dimensional systems. We use the proposed HMM for multiple interactive motion trajectory classification and natural-man-made image segmentation.

Dan Schonfeld博士的简历

Schonfeld博士1964年6月11日出生于美国宾夕法尼亚州的西切斯特。他于1986年在加州大学伯克利分校获得电子工程和计算机科学的学士学位，1988年和1990年在约翰・霍普金斯大学分别获得电子和计算机工程的硕士和博士学位。他于1990年加入伊利诺大学芝加哥校区，现在，他是电子与计算机工程系的副教授。Schonfeld博士已经在各种期刊和会议上撰写了100多篇论文。他是2006年度VCIP和IEEE ICIP最佳学生论文奖的论文合著者。他现任associate editor of IEEE Transactions on Image Processing on Image and Video Storage， Retrieval and Analysis and associate editor of the IEEE Transactions on Circuits and Systems for Video Technology on Video Analysis，associate editor of IEEE Transaction on Signal Processing on Multidimensional Signal Processing and Multimedia Signal Processing，associate editor of IEEE Transaction on Image Processing on Nonlinear Filtering。他现在的研究领域涉及信号、图像和视频处理；视频通信、恢复和网络；图像分析和计算机视觉以及基因信号处理。