【作者】 张弢；

【导师】 刘载文；

【作者基本信息】 北京工商大学 ， 控制理论与控制工程， 2010， 硕士

【摘要】 视频监控系统是信息科学、计算机科学、机器视觉等学科理论及各种硬件和技术相结合的综合系统,可以为突发性事件的取证、分析、研究提供及时、全面和可靠的信息,帮助管理人员合理调动资源,有针对性地制定解决方案,从而提高安全防范水平。视频监控以其在城市治安管理上的独特优势,已经成为当今人工智能领域的一个研究热点。然而,目前的视频监控系统结构简单,其各部分的算法仍存在一些缺陷,因此迫切需要采取更先进的技术,提高视频监控系统在实际应用中的可行性、稳定性和实时性。本文从视频监控系统的整体结构入手,运用智能信息处理的相关技术,对其中涉及到的相关理论方法进行研究。首先,针对运动目标检测过程易受背景抖动、环境光线变化等外界因素干扰而造成目标提取失败这一问题,提出一种基于时域差分法和背景减除法相结合的运动目标检测方法,降低了噪声对目标检测所造成的误判,并且对背景扰动、阴影等影响有较好地抑制作用,使检测的准确率明显提高;其次,在对运动目标识别与分类的研究中,采用D-S(Dempster-Shafer)证据理论对运动目标的面积、速度和形状复杂度进行多特征信息融合。针对D-S证据理论在证据高冲突下失效这一问题,采用一种优化权值分配模型的改进方法,有效地消除了冲突证据对融合结果的影响,使目标识别的结果更加合理、客观;最后,将基于参数化主动轮廓模型的目标跟踪方法应用于本文设计的基于多模块信息融合的视频监控系统中。该系统通过集成运动检测模块、头部检测模块、目标识别模块、主动轮廓跟踪四个模块,克服单个模块的局限性来提高监控系统整体性能,为复杂环境下的运动目标的检测、识别与跟踪提供了一种新途径。本文对提出的运动目标检测方法、目标识别分类方法以及开发的视频监控系统进行了大量的实验,验证了这些方法在实际应用中的有效性,具有一定的理论价值和实用价值。更多还原

【Abstract】 The visual surveillance system is the complex combination system of information science, computer science, machine vision and all kinds of hardware, technology and theories. The visual surveillance system not only provide prompt, comprehensive and the reliable information for sudden event’s evidence collection, analysis and research, but also help administrators transfer the resources reasonably, and works out the pertinence solution. Thus the visual surveillance system can remarkable raises the level of security protection.Starting with the overall structure of visual surveillance system, this thesis has studied the main involved theories by utilizing the technique of intelligence information processing. Firstly, the paper proposed a novel method for moving-objects detection based on fusion of background subtraction and an improved three frames differencing in view of the influence of applications in the reality, such as light changes, camera shake, backgrounds disturbing and so on. The experimental results show that the new method effectively decreases the misjudgments caused by noise, significantly improves the accuracy, and can meet the needs of real-time. Secondly, aiming at the problem of target identification in the multi-features fusion of the visual surveillance system, a improved Dempster-Shafter evidence theory are put forward on the basis of optimization theory, which have effectively solved the problem of object recognition in the condition of high evidence conflict. This algorithm is used for video surveillance system to distinguish vehicle, people and other objects. Through analyzing the simulation example, the results show that the algorithm can gives a more reasonable combination results and has a good adaptive ability. At last, the visual surveillance system based on fusion of mult-model data is designed, which integrates motion detector module, head detector module, target recognition module and parametric active contours tracker module. The main goal of using more than one module is to make up for deficiencies in the individual modules, thus achieving a better overall tracking performance than each single module could provide.Lots of experiments are also provided for theories put forward in this thesis, including moving-objects detection and adaptive background updating method, object recognition method, and at result the effectiveness and feasibility of these methods are proved.更多还原