Min Kyosik, Park Jae-Hyeung
Opt Express. 2020 Dec 7;28(25):38140-38154. doi: 10.1364/OE.411312.
A digital micro-mirror device is one of the most frequently used spatial light modulators for holographic three-dimensional displays due to its fast refresh rate. The modulation by the digital micro-mirror device is, however, limited to the binary amplitude modulation, and it degrades the reconstruction image quality. In this paper, we propose a novel binary hologram encoding technique which applies the error diffusion algorithm considering the carrier wave of the hologram. The error diffusion weights designed for the hologram carrier wave suppress the binarization noise around the carrier wave where the most signal energy is concentrated, which enhances the reconstruction quality. The combination with the time-multiplexing enables speckless enhanced-quality three-dimensional reconstruction with shallow depth of focus. The proposed technique is verified by simulations and optical experiments.
数字微镜器件因其快速刷新率而成为全息三维显示中最常用的空间光调制器之一。然而，数字微镜器件的调制仅限于二元振幅调制，这会降低重建图像质量。在本文中，我们提出了一种新颖的二元全息图编码技术，该技术考虑了全息图的载波并应用误差扩散算法。为全息图载波设计的误差扩散权重抑制了载波周围信号能量最集中处的二值化噪声，从而提高了重建质量。与时分复用相结合，能够实现具有浅焦深的无斑点高质量三维重建。通过仿真和光学实验验证了所提出的技术。
