【作者】 李维；

【导师】 滕建辅；

【作者基本信息】 天津大学 ， 电路与系统， 2009， 硕士

【摘要】 多媒体技术发展日新月异,立体视频多媒体技术是其中的热点。立体视频根据观察视点的多少可以分为双目立体视频和多视点立体视频。其中双目立体视频又分为平行式和汇聚式摄像系统。本文中讨论的立体视频系统属于双目平行摄像系统。首先介绍了人眼视觉系统,分析了人眼视觉特性以及人眼视差原理,这是实现压缩和立体拍摄的理论原理。其次阐述了MPEG-2视频编码标准,包括系统结构,编码方式,以及“型”和“级”的概念。利用MPEG-2的时间可分级结合运动补偿预测和视差补偿预测实现立体编码方案,并提出了增强层中使用双向预测的帧结构编码方式。视差估计算法是进行立体匹配为的关键步骤,常用的立体的匹配算法可以分为全局匹配算法和区域匹配算法。区域匹配算法较为简单,应用较多,其中块内各像素点误差绝对和(SAD)算法在确定了匹配模板之后匹配速度快,但容易出现误配现象。对比SAD算法,块内各像素点差分误差的绝对和(SSAD)算法在一定程度上改进了匹配精度,取得了较精确的视差图。在立体显示方面,常见的方式有光分法、时分法、色分法。光分法有高成本,视点固定的缺点,时分法存在“闪烁”问题,色分法有固有的“串色干扰”问题。将时分法和色分法相结合,按场频时分互补方案和按行频时分互补方案进行软件实现,并提出了新的倍频场图像的时分互补方案且加以实现。更多还原

【Abstract】 With the rapid development of multimedia technology, 3D video multi-media technology has been grabbed the attention of the world, based on the observed number of point of view, which can be divided into binocular 3Dvideo and multi - viewpoint 3D video. Binocular stereo video includes parallel and cluster-type camera system. 3D video based on binocular parallel camera system is discussed.Firstly, human visual system (HVS) is introduced in this article, which is the principle of video compression and stereo camera shooting, and then, human visual characteristics and principle of the disparity are analyzed. Secondly, MPEG-2 video coding standard including system architecture, coding, as well as the concept of "profile" and "level" are introduced amply. In addition, scalability is supported by MPEG-2, time scalability can be realized stereo coding with motion compensation prediction and disparity compensation prediction and a encoding mode of frame struction using bidirectional prediction in enhancement layer is proposed. Disparity estimation algorithm for stereo matching is a crucial step, which can be divided into global and regional matching algorithm. Regional matching algorithm is simpler and applied usually. SAD algorithm can achieve fast matching with the matching template determined, but the mismatching is usually occurred. SSAD algorithm which is improved based on SAD algorithm increases matching precision in some degree and accurate disparity picture is obtained.In the stereo display aspect, there are several common methods, such as optical division time-division and anaglyph. The shortcoming of Optical division is its high-cost and fixed point of view when observing. There are "flicker" problem and "cross color interference" problem in time-division and anaglyph respectively. The field frequency time division anaglyph and the line frequency time division anaglyph are achieved in software programs by combining time-division and color-division,and a new time-division and anaglyph method reduplicating the vertical frequency of the field picuture is proposed and achieved.更多还原