用波前平面提高全息体视图成像分辨率  

Improvement of Imaging Resolution of Holographic Stereogram Using Wavefront Plane

作　　者：黄应清[1] 赵锴[2] 蒋晓瑜[2] 闫兴鹏[2] 

机构地区：[1]中国人民解放军装甲兵工程学院训练部,北京100072 [2]中国人民解放军装甲兵工程学院信息工程系,北京100072

出　　处：《中国激光》2016年第2期206-214,共9页Chinese Journal of Lasers

基　　金：全国优秀博士学位论文作者专项资金(201432);北京市自然科学基金(4152049);北京市科技新星计划(Z1511000003150119)

摘　　要：针对全息体视图成像分辨率较低的问题,提出了用波前平面提高成像分辨率的方法。定量分析了空间采样、角采样和衍射效应对全息体视图成像极限分辨率的影响;以人眼在距离全息图600 mm处观察的极限分辨能力为标准,给出了全息体视图的成像极限分辨率与三维场景深度及全息单元(Hogel)尺寸之间的关系;得出了在波长取632.8 nm时,全息体视图能够高分辨率再现的三维场景的极限深度为12.80 mm,最佳Hogel尺寸为90μm,并且依据极限深度设置了波前平面。选择2个三维场景进行了验证实验:数字模拟再现了结构较为复杂的坦克模型,可以准确表现出模型的各个深度上的精细结构;用基于空间光调制器的全息三维显示系统对茶壶模型进行了光学再现,再现图像很好地提供了深度和光泽等三维感知因素。Because of the low imaging resolution of holographic stereogram, a method using wavefront plane is proposed to improve imaging quality. The resolution limit of holographic stereogram is mainly affected by spatial sampling, angular sampling and diffraction. The influences due to these factors are analyzed with mathematical equations. Supposing that the distance between hologram and human eyes is about 600 mm, the relationship between imaging resolution limit and depth of three-dimensional scene or Hogel size is provided according to acuity of human eyes. The depth limit of three-dimensional scene and optimal Hogel size are 12.80 mm and 90 p.m, respectively, if the wavelength is 632.8 rim. A wavefront plane which is decided by depth limit is set. The experiments are performed with two three-dimensional scenes to evaluate the proposed method. With numerical simulation method, the tank model which has complicate structures is reproduced. The elaborate features of tank model at every depth are accurately obtained. A teapot model is optically reconstructed with holographic three-dimensional display system based on spatial light modulator. The three-dimensional cues such as depth and gloss are well provided in the reconstructed images.

关 键 词：全息 计算全息 全息显示 成像分辨率 

分 类 号：O438.1[机械工程—光学工程]