Compressing phase-only holograms via deep phase unwrapping

We propose a compression method for phase-only holograms. We first apply a deep neural network-based phase unwrapping algorithm to a target phase map. The unwrapped phase map becomes spatially smooth like natural images. On the basis of this characteristic, we then compress the unwrapped phase map using a deep image compression method. We demonstrate that phase unwrapping achieves high rate-distortion performance.