【作者】 韩文娟；

【导师】 王金城；

【作者基本信息】 中国海洋大学 ， 光学工程， 2006， 硕士

【摘要】 合成全息显示技术进入数字化阶段之后,大幅面大视场的数字合成全息显示技术便在三维显示领域内独树一帜,成为众多的公司、科研机构和研究者致力探索的热点。其中,由小面积单元全息图拼接获得大面积全息图的方案具有较强的实用价值,并且已经产品化,初步投入使用。本文分析了实现全息图拼接需要解决的问题,提出一种实现全息图拼接的方法,并且通过实验验证了方法是可行的。本文参考了有关合成全息的前沿技术,结合前期实验工作的经验,利用现有的图像处理软件,使用研制开发的数字合成全息系统,实现了全息图的拼接。制作拼接全息图主要包括三个步骤:(1)三维场景的“分割”。实验中选用由计算机生成的三维场景,并使用虚拟摄像机,实现对整个场景的“分割”,确定各个单元全息图所要记录的内容。(2)单元全息图的制作。包括:对所要记录场景进行采样的过程,使用图像变换的方法,将获得的体视图序列转换为全息记录时狭缝通道对应的图像序列的过程,以及全息记录过程。(3)单元全息图的拼接和场景再现。本文的工作重点是分析实现全息图拼接的视场原理和利用合成全息技术拍摄单元全息图时需要解决的问题,提出拍摄具有较大再现视场的单元全息图的方法,通过实验制作了多个具有较大再现视场的单元全息图,并且将它们拼接,得到了面积超过普通全息记录干板面积的白光再现反射型拼接全息图。论文主要有六部分构成。前言部分,简述从全息技术的诞生到大面积数字合成全息图出现的整个过程,指出全息图拼接技术的提出是符合发展需要的。第一章,讨论全息图拼接相关的原理,主要包括:全息图再现视场分析、合成全息技术的原理、通过合成全息技术实现全息图拼接存在的问题以及解决方法等。第二章,介绍实现全息图拼接的方案,包括图像处理软件的选择、场景“分割”、单元全息图的制作以及拼接全息图的再现。第三章,具体实验阶段,分为验证性实验和调整后最终完成拼接实验两个阶段。第四章,对实验结果的分析总结,探讨了拼接方法的可行性,并对存在的不足提出解决的方法。第五章,对全息图拼接技术的发展前景进行展望。更多还原

【Abstract】 Holography is in a digital development. Large scale and large viewing field stereograms are more superior than any other patterns used in stereo-display fields. It is a hotpot that many researchers endeavor in. The method of making large-scale stereogram by stitching together small-scale ones has rather practicability, and has been put into products. This thesis analyzes the difficulties in making large-scale stereograms, brings forward a way to make the technology of mosaic to be the truth and tests it in experiments.The whole process includes three steps. They are division of the scene, producing the small-scale holographic units and piecing up the units into a large one in order to get the reappearance of the scene. In the course, several kinds of image software are used to provide images to make sure all the units can construct a whole stereogram, and the reality of the scene recorded may be remained. The DSH (Digital Synthesized Holographic) system is used to make the small-scale units.The main job of the thesis focuses on the achievement of the stitching skill. Based on analyzing the field of vision, a way by increasing the distance of the viewer to get a larger field of vision is practiced. At the same time, the technology of image transformation can solve the problems , such as distortion and so on.The thesis is composed of six parts. In the first part, the developing history and priority of the digital holography are induced. Difficulties of making large-scale holography by stitching many units are also indicated. The second part is important. In this section, some basic concepts and theories are discussed briefly. The main difficulties and settlements are put forward, too. The third part brings up the experimental scheme. The selection of software, the division of the scene, image transformation and design of display instruments are expatiated. The forth part brings the method into effect, including two segments. The first one is mainly testing the feasibility of the method to make a small-scale unit with large field of vision. In the second segment, some parameters are adjusted to get a perfect achievement. A larger stereogram built by three small units is made. The fifth part analyzes the problems in the achievement, discusses the insufficiencies of our experiment, and gives several relevant ameliorations. The last part summarizes the meaning of this experiment. And the foreground of the method in application is expected.更多还原