权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Three dimensional real image display with conical holographic stereograms

圆锥全息立体图三维实像显示

基本信息

批准号：
02452079
负责人：
TSUJIUCHI Jumpei
金额：
$ 4.22万
依托单位：
Chiba University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-02452079/
关键词：
Hologram Three Dimensional Display Color Hologram Liquid Crystal Spatial Light Modurator Compensation of Cromatic Aberration Diffraction Grating Holographic Stereogram ホログラフィックステレオグラム

项目摘要

Many types of holographic stereograms have been studied due to their ability of reconstructing three dimensional images made by computers. Among then, the conical holographic stereogram is one of the most interesting methods because of the following advantages ; the facility of reconstructing floating images above the hologram surface and the possibility of observing images from the upper inclined direction. The following results are obtained in this research.(1) Since the image blur is in proportion to the distance between the image and the hologram plane, the blur tends to be large in conical holographic stereograms. To compensate this blur, a new illumination optics for reconstruction is proposed. In this method, the hologram is illuminated by the diffracted light of a grating with the same average spatial frequency as the hologram(2) To make the hologram quickly, a liquid crystal spatial light modulator(LC-SLM)is employed to record the hologram, instead of photographic transparencies with different perspectives. It is analyzed that the quality of images displayed by the LC-SLM and by the hologram.(3) As a basic study of making color holograms, it is measured spectral diffraction efficiencies of Bragg gratings made with three wavelengths. In order to make a color holographic stereogram, an optical setup is proposed by using three different laser lights and a color LC-SLM.

由于具有重建计算机制作的三维图像的能力，许多类型的全息立体图已被研究。其中，圆锥全息立体图是最有趣的方法之一，因为它具有以下优点；在全息图表面上方重建浮动图像的便利性以及从上方倾斜方向观察图像的可能性。本研究得到以下结果：(1)由于图像模糊与图像与全息图平面之间的距离成正比，圆锥形全息立体图的模糊往往较大。为了补偿这种模糊，提出了一种用于重建的新照明光学器件。在该方法中，全息图由与全息图具有相同平均空间频率的光栅衍射光照射（2）。为了快速制作全息图，采用液晶空间光调制器（LC-SLM）来记录全息图，而不是不同视角的照相胶片。分析了LC-SLM和全息图显示的图像质量。(3)作为彩色全息图制作的基础研究,测量了三种波长的布拉格光栅的光谱衍射效率。为了制作彩色全息立体图，提出了使用三种不同激光和彩色 LC-SLM 的光学装置。