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1.浙江师范大学 信息光学研究所,浙江 金华 321004
2.浙江省光信息检测与显示技术研究重点实验室,浙江 金华 321004
[ "李勇(1972—),男,浙江台州人,博士,教授,2006年于四川大学获得博士学位,主要从事光学三维感知、全息三维显示方面研究。E-mail:liyong@zjnu.cn" ]
收稿日期:2022-01-27,
修回日期:2022-02-18,
纸质出版日期:2022-05-05
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李勇, 何良波, 詹建东, 等. 基于数字化全息的虚实混合场景动态三维显示[J]. 液晶与显示, 2022,37(5):632-638.
Yong LI, Liang-bo HE, Jian-dong ZHAN, et al. Dynamic 3D display of mixed virtual and real scene based on digitized holography[J]. Chinese journal of liquid crystals and displays, 2022, 37(5): 632-638.
李勇, 何良波, 詹建东, 等. 基于数字化全息的虚实混合场景动态三维显示[J]. 液晶与显示, 2022,37(5):632-638. DOI: 10.37188/CJLCD.2022-0028.
Yong LI, Liang-bo HE, Jian-dong ZHAN, et al. Dynamic 3D display of mixed virtual and real scene based on digitized holography[J]. Chinese journal of liquid crystals and displays, 2022, 37(5): 632-638. DOI: 10.37188/CJLCD.2022-0028.
提出了一种数字全息图(DH)与计算机制全息图(CGH)结合的虚实混合场景全息三维显示方法。首先采用无透镜傅里叶变换数字全息图记录真实场景三维信息。接着根据空间光调制器像素间距对DH进行采样频率变换。然后在频域对变换后的DH进行高通滤波及场景的缩放、面内旋转、平移等操作。最后采用双极强度法计算虚拟场景的CGH。计算中,将处理后的DH作为双极强度叠加的初始值,从而实现了真实和虚拟场景全息图的融合。搭建彩色动态全息三维显示系统对提出的方法进行了实验验证。对商用反射式液晶4 K投影仪进行了改造,实现了30 fps的彩色动态全息三维显示。实验结果表明所提出的方法实现了DH和CGH的高效融合,为虚实混合场景动态全息三维显示提供了一种有效途径。
A holographic three-dimensional display method of virtual and real scene based on the combination of digital hologram (DH) and computer-generated hologram (CGH) is proposed. Firstly, the lensless Fourier transform digital hologram is used to record the three-dimensional information of the real scene. Secondly, the sampling frequency of DH is transformed according to the pixel interval of spatial light modulator. Then high pass filtering, scene scaling, in-plane rotation and translation operations are performed on the transformed DH in the frequency domain. Finally, the CGH of virtual scene is calculated by bipolar intensity method. In the calculation, the processed DH is taken as the initial value of bipolar intensity superposition, so as to realize the fusion of real and virtual scene holograms. The color dynamic holographic three-dimensional display system is built to verify the proposed method by experiments. A commercial 4K projector employing reflective liquid crystal is reformed, and the color dynamic holographic three-dimensional display of 30 fps is realized. Experimental results show that the proposed method realizes the efficient fusion of DH and CGH, and provides an effective way for dynamic holographic three-dimensional display of virtual and real mixed scenes.
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