用波前平面提高全息体视图成像分辨率

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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90 μm,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。
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