【作者】 于佳；

【导师】 王金城；

【作者基本信息】 中国海洋大学 ， 光学工程， 2005， 硕士

【摘要】 二十世纪末到现在,合成全息显示技术进入了数字化发展阶段。在高质量合成立体显示的研究中,大幅面大视场的合成全息图一直是研究的前沿和热点。由小型单元全息图拼接大型全息图的方案具有较强的实用性,并且已经投入商业生产和使用。本文介绍了拼接方法的基础技术之一,图像变换方法,并结合实际分析了不同图像变换技术的特点,提出了自己方案进行了实验和分析。 本文参考国内外合成全息图前沿技术,提出一种利用现有数字图像处理软件实现图像变换预矫正的方法。结合该方法拍摄合成全息图主要包括四个主要步骤:一,模型的建立和图像的采集。本文选择由计算机生成三维场景,并依照图像变换和全息记录的要求,用软件进行场景采样,生成原始二维图像序列。二,图像变换处理,对原始二维图象进行透视畸变的预矫正。三,菲涅尔全息图母板的拍摄。以数字微反射镜(DMD)作为空间光调制器,利用实验室现有数字合成全息图拍摄系统拍摄菲涅尔全息图。四,白光再现全息图的拍摄。 本文的工作重点在根据图像变换的原理,提出了一种利用现有计算机图像处理软件完成图像变换对合成全息图的透视畸变进行预矫正的方法,并用经过该方法进行预矫正的二维图像序列制作菲涅尔合成全息图。 本文的主要内容包括:第一部分,前言主要阐述了合成全息技术的发展历史和现状。第二部分主要讨论了合成全息图的双眼视差原理与合成立体原理,合成全息图再现像的畸变及其产生的原因,并提出用图像变换矫正图像透视畸变的方法。第三部分提出本次实验的实验方案,计算得出各项参数,并具体说明了实验多成,包括:制作三维场景,进行采样,用现有软件实现图象变换预矫正,拍摄合成全息图母板和白光再现全息图。第四部分是对实验结果的分析和总结、对图像变换方法的可行性和实用性分析、对实验中遇到问题的分析和相应改进方法的讨论。第五部分总结了本次实验的意义,并对图像变换方法的应用和进一步的工作进行了前景展望。更多还原

【Abstract】 Since the end of the 20th century, stereograms have been in a digital development. In the research of the high-quality stereogram display system, large scale and large viewing field stereograms have always been in the leading edge. The method of making large-scale stereogram by piecing together small-scale stereograms has rather high practicability, and has been put into mass produce. As one of the elementary techniques of piecing together method, the perspective image predistortion methods are introduced compared, and the comparatively suitable method is tested and practiced.There are four steps of making a stereogram using perspective image predistortion method: first step, set up the scene and sample images. The scene is made in computer and according to the rule of hologram recording; images are sampled from the scene. Second step, perspective image predistortion processing. Digital image processing software is choosing to accomplish this step. Third step, make the master hologram. A transmitting hologram is made using the existing stereogram producing system. Last step, make the reflective hologram that could be observed in white light.The most important work of the experiment is to analysis the relationship of the image and the scene during stereogram reappearing and recording, calculate all the geometry parameters, according to which the perspective image predistortion is accomplished automatically by using the existing image processing software.The thesis has several main contents: the fist part introduces the development and the status quo of stereogram. The second part mainly discusses the reason of the predistortion method, the image relationship of the stereogram, and the main reason of the image distortion and the ways of its compensation. The third part brings up the plan of the experiment, including scene modeling, image sampling, perspective image predistortion, and the master hologram recording. The forth part concerns bringing the play into practice, and finally making a reflective hologram that could show the result of the predistortion method in white light. The fifth part discusses the result of the experiment, analysis the problems occurred in the experiment. The sixth part summarizes the meaning of the experiment and takes a glance of the future work.更多还原