Data hiding in complex-amplitude modulation using a digital micromirror device

TL;DR

This paper introduces a method for data hiding in complex-amplitude modulation using a digital micromirror device, leveraging encoding redundancy to embed data without affecting the original light field.

Contribution

It proposes a superpixel scheme that exploits pattern redundancy in DMD-based complex light modulation for secure data embedding.

Findings

Large data capacity achieved without degrading light modulation quality

Original complex light information remains fully preserved

Suitable for secure transmission and copyright protection

Abstract

A digital micromirror device (DMD) is an amplitude-type spatial light modulator. However, a complex-amplitude light modulation with a DMD can be achieved using the superpixel scheme. In the superpixel scheme, we notice that multiple different DMD local block patterns may correspond to the same complex superpixel value. Based on this inherent encoding redundancy, a large amount of external data can be embedded into the DMD pattern without extra cost. Meanwhile, the original complex light field information carried by the DMD pattern is fully preserved. This proposed scheme is favorable for applications such as secure information transmission and copyright protection.