Head-mounted holographic displays (HMHD) are projected to be the first commercial realization of holographic video display systems. HMHDs use liquid crystal on silicon (LCoS) spatial light modulators (SLM), which are best suited to display phase-only holograms (POH). The performance/watt requirement of a monochrome, 60 fps Full HD, 2-eye, POH HMHD system is about 10 TFLOPS/W, which is orders of magnitude higher than that is achievable by commercially available mobile processors. To mitigate this compute power constraint, display-ready POHs shall be generated on a nearby server and sent to the HMHD in compressed form over a wireless link. This paper discusses design of a feasible HMHD-based augmented reality system, focusing on compression requirements and per-pixel rate-distortion trade-off for transmission of display-ready POH from the server to HMHD. Since the decoder in the HMHD needs to operate on low power, only coding methods that have low-power decoder implementation are considered. Effects of 2D phase unwrapping and flat quantization on compression performance are also reported. We next propose a versatile PCM-POH codec with progressive quantization that can adapt to SLM-dynamic-range and available bitrate, and features per-pixel rate-distortion control to achieve acceptable POH quality at target rates of 60-200 Mbit/s that can be reliably achieved by current wireless technologies. Our results demonstrate feasibility of realizing a low-power, quality-ensured, multi-user, interactive HMHD augmented reality system with commercially available components using the proposed adaptive compression of display-ready POH with light-weight decoding.

中文翻译：

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通过轻量级压缩实现低功耗头戴式纯相位全息显示


头戴式全息显示器（HMHD）预计将成为全息视频显示系统的第一个商业实现。 HMHD 使用硅基液晶 (LCoS) 空间光调制器 (SLM)，最适合显示纯相位全息图 (POH)。单色、60 fps 全高清、2 眼、POH HMHD 系统的性能/瓦特要求约为 10 TFLOPS/W，这比商用移动处理器可实现的性能高出几个数量级。为了缓解这种计算能力限制，应在附近的服务器上生成可显示的 POH，并通过无线链路以压缩形式发送到 HMHD。本文讨论了一种可行的基于 HMHD 的增强现实系统的设计，重点关注将显示就绪的 POH 从服务器传输到 HMHD 的压缩要求和每像素率失真权衡。由于HMHD中的解码器需要在低功耗下运行，因此仅考虑具有低功耗解码器实现的编码方法。还报告了二维相位展开和平坦量化对压缩性能的影响。接下来，我们提出了一种具有渐进量化功能的多功能 PCM-POH 编解码器，可以适应 SLM 动态范围和可用比特率，并具有每像素率失真控制功能，以在 60-200 Mbit/s 的目标速率下实现可接受的 POH 质量，可以通过当前的无线技术可靠地实现。我们的结果证明了使用商用组件使用所提出的具有轻量级解码的显示就绪 POH 的自适应压缩来实现低功耗、有质量保证的多用户交互式 HMHD 增强现实系统的可行性。