Data hiding in complex-amplitude modulation using a digital micromirror device
This enables secure information transmission and copyright protection in optical applications, representing an incremental improvement.
The paper tackled the problem of embedding external data into digital micromirror device (DMD) patterns without altering the original complex light field, achieving this by exploiting inherent encoding redundancy in the superpixel scheme.
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.