Improving performance of single-pass real-time holographic projection

TL;DR

This paper introduces a novel single-transform time-multiplexed hologram generation method that enhances real-time binary holographic projection by emulating multi-level modulation with fewer sub-frames, improving accuracy and speed.

Contribution

The paper presents the STTM approach, a new method for hologram generation that reduces error and computation time compared to existing techniques like OSPR, with a hybrid method combining both.

Findings

STTM produces lower mean squared error than OSPR for N up to 5.

STTM achieves this with a generation time of 1/N of OSPR.

Hybrid approach combines benefits of STTM and OSPR.

Abstract

This work describes a novel approach to time-multiplexed holographic projection on binary phase devices. Unlike other time-multiplexed algorithms where each frame is the inverse transform of independently modified target images, Single-Transform Time-Multiplexed (STTM) hologram generation produces multiple sub-frames from a single inverse transform. Uniformly spacing complex rotations on the diffraction field then allows the emulation of devices containing 2^N modulation levels on binary devices by using N sub-frames. In comparison to One-Step Phase Retrieval (OSPR), STTM produces lower mean squared error for up to N = 5 than the equivalent number of OSPR sub-frames with a generation time of 1/N of the equivalent OSPR frame. A mathematical justification of the STTM approach is presented and a hybrid approach is introduced allowing STTM to be used in conjunction with OSPR in order to combine performance benefits.