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

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