3.7 多目标识别 若场景中存在多个目标，则可以通过多目标识别和定位进一步提高精度。另 外，在跟踪过程中，若因为遮挡、光照等因素，某个目标跟踪失败后，还可以通 过其它场景中的目标继续实现定位，因此多目标识别可以提高算法鲁棒性。 Harris-SIFT 特征匹配 目标1目标 0 目标N 仿射检验 仿射检验 仿射检验 目标 0 目标 4 ⋯ 目标 N 成 功 失 败 成 功 目标数据库 终止 图 3-12 多目标识别示意图 Figure 3-12 Framework of multiple-object recognition 如图 3-12所示，和单目标识别一样，多目标识别也分为特征匹配、仿射检验、 模式识别三步，不同的是，需要对匹配特征点集合按目标分类，再依次对各个类 别进行仿射检验，以判断当前场景中是否存在某个目标，算法概括如下： 离线：使用 Harris-SIFT建立目标数据库 在线： 1. 从当前场景图像提取 Harris-SIFT特征点 2. 快速搜索近似最近邻居，得到匹配特征点集合 3. 将匹配特征点按目标类别分类

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本书是美国萨福克大学已使用十余年的经典教程，利用跨平台开源软件开发框架Qt阐释了C++和设计模式中的主要思想。全书共分四个部分：第一部分介绍C++、UML、Qt、模型-视图、SQL、XML、设计模式等基础知识，目的是为零基础的C++初学者铺垫一条学习面向对象编程的快捷之路；第二部分讲解内存访问、继承等重要的C++特性，是前一部分的延伸和拓展；第三部分使用Phonon编写了一个多媒体播放器，展示了主要技术理念的应用方法；附录部分给出了C++保留关键字、Debian和Qt程序开发环境的配置等内容。每节的练习题和各章后面的复习题，既可作为课堂上的讨论题，也可进一步启发读者对于关键知识点的思考。

Editorial Reviews Review "...well written and flows smoothly...provides electrical engineering students with a new perspective in applied electromagnetics and circuit design...highly recommended." (CHOICE, September 2006) "...well written and flows smoothly...provides electrical engineering students with a new perspective in applied electromagnetics and circuit design...highly recommended." (CHOICE, September 2006) Product Description A Landmark text thoroughly updated, including a new CD As digital devices continue to be produced at increasingly lower costs and with higher speeds, the need for effective electromagnetic compatibility (EMC) design practices has become more critical than ever to avoid unnecessary costs in bringing products into compliance with governmental regulations. The Second Edition of this landmark text has been thoroughly updated and revised to reflect these major developments that affect both academia and the electronics industry. Readers familiar with the First Edition will find much new material, including: * Latest U.S. and international regulatory requirements * PSpice used throughout the textbook to simulate EMC analysis solutions * Methods of designing for Signal Integrity * Fortran programs for the simulation of Crosstalk supplied on a CD * OrCAD(r) PSpice(r) Release 10.0 and Version 8 Demo Edition software supplied on a CD * The final chapter on System Design for EMC completely rewritten * The chapter on Crosstalk rewritten to simplify the mathematics Detailed, worked-out examples are now included throughout the text. In addition, review exercises are now included following the discussion of each important topic to help readers assess their grasp of the material. Several appendices are new to this edition including Phasor Analysis of Electric Circuits, The Electromagnetic Field Equations and Waves, Computer Codes for Calculating the Per-Unit-Length Parameters and Crosstalk of Multiconductor Transmission Lines, and a SPICE (PSPICE) tutorial. Now thoroughly updated, the Second Edition of Introduction to Electromagnetic Compatibility remains the textbook of choice for university/college EMC courses as well as a reference for EMC design engineers. An Instructor's Manual presenting detailed solutions to all the problems in the book is available from the Wiley editorial department. From the Publisher Deals with the topic of interference (electromagnetic compatibility) in electronic systems. It builds on basic undergraduate electrical engineering concepts and principles and applies them to the design of electronic systems that operate compatibly with other electronic systems and do not create interference phenomena. To facilitate classroom teaching it is divided in two parts. The first provides the basic principles and skills for review, while the second refers to applications and aspects of EMC design. --This text refers to an out of print or unavailable edition of this title. From the Back Cover A Landmark text thoroughly updated, including a new CD As digital devices continue to be produced at increasingly lower costs and with higher speeds, the need for effective electromagnetic compatibility (EMC) design practices has become more critical than ever to avoid unnecessary costs in bringing products into compliance with governmental regulations. The Second Edition of this landmark text has been thoroughly updated and revised to reflect these major developments that affect both academia and the electronics industry. Readers familiar with the First Edition will find much new material, including: Latest U.S. and international regulatory requirements PSpice used throughout the textbook to simulate EMC analysis solutions Methods of designing for Signal Integrity Fortran programs for the simulation of Crosstalk supplied on a CD OrCAD® PSpice® Release 10.0 and Version 8 Demo Edition software supplied on a CD The final chapter on System Design for EMC completely rewritten The chapter on Crosstalk rewritten to simplify the mathematics Detailed, worked-out examples are now included throughout the text. In addition, review exercises are now included following the discussion of each important topic to help readers assess their grasp of the material. Several appendices are new to this edition including Phasor Analysis of Electric Circuits, The Electromagnetic Field Equations and Waves, Computer Codes for Calculating the Per-Unit-Length Parameters and Crosstalk of Multiconductor Transmission Lines, and a SPICE (PSPICE) tutorial. Now thoroughly updated, the Second Edition of Introduction to Electromagnetic Compatibility remains the textbook of choice for university/college EMC courses as well as a reference for EMC design engineers. About the Author CLAYTON R. PAUL, PHD, is Professor and Sam Nunn Chair of Aerospace Systems Engineering, Department of Electrical and Computer Engineering, Mercer University. He is also Emeritus Professor of Electrical Engineering at the University of Kentucky, where he served on the faculty for twenty-seven years. Dr. Paul is the author of twelve textbooks in electrical engineering, has contributed numerous chapters to engineering handbooks and reference texts, and has published numerous technical papers in scientific journals and symposia. He is a Fellow of the IEEE and a Honorary Life Member of the IEEE EMC Society.

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