通过自适应调制扩展全息显示视角与视场，提升虚拟现实体验。
Large Étendue 3D Holographic Display with Content-adaptive Dynamic Fourier Modulation
- 利用多光源和傅里叶平面自适应调幅实现光路扩展。
- 模拟与实验均显著提升图像质量与光通量范围（étendue）。
- 适合研究高阶全息显示与近眼虚拟现实系统的人群。
新兴全息显示技术为下一代虚拟现实系统提供独特能力。然而，当前全息近眼显示器的光通量范围（étendue）较小，导致视场与眼盒尺寸之间存在直接权衡。尽管已有光通量扩展研究，但现有方法或在图像质量上受限，或需极高刷新率的空间光调制器。本文提出一种新方法，结合多个相干光源与内容自适应的全息谱幅度调制。为生成时间复用的相位与振幅图案，我们设计了一种瞳孔感知的基于梯度下降的计算全息算法，以大基线目标光场为监督信号。与基准方法相比，本方法在仿真及实验原型中均显著提升了图像质量与光通量范围。
原文摘要 · Abstract (English)
Emerging holographic display technology offers unique capabilities for next-generation virtual reality systems. Current holographic near-eye displays, however, only support a small étendue, which results in a direct tradeoff between achievable field of view and eyebox size. Étendue expansion has recently been explored, but existing approaches are either fundamentally limited in the image quality that can be achieved or they require extremely high-speed spatial light modulators. We describe a new étendue expansion approach that combines multiple coherent sources with content-adaptive amplitude modulation of the hologram spectrum in the Fourier plane. To generate time-multiplexed phase and amplitude patterns for our spatial light modulators, we devise a pupil-aware gradient-descent-based computer-generated holography algorithm that is supervised by a large-baseline target light field. Compared with relevant baseline approaches, our method demonstrates significant improvements in image quality and étendue in simulation and with an experimental holographic display prototype.
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