Compression protocol for optimized random phase color holographic videos by delta encoding

Abstract

In this paper, we develop a tailor-made compression protocol with high performance, both for lossless and lossy compression of holographic videos generated by means of optimized random phases. We demonstrate that this holographic generation technique introduces an interframe correlation that makes delta encoding an efficient way to store holographic video data. By combining this encoding with common lossless compression algorithms, we achieve an increase of the compression ratio of 0.35 compared to a holographic video generated by direct application of the Gerchberg–Saxton algorithm. Additionally, we show that a high level of lossy compression can be achieved with this encoding, with better reconstruction quality than direct application of common video compression techniques, like MPEG-4 and motion-JPEG. Furthermore, we verify experimentally the performance of the compression scheme by using a space division multiplexing color holographic projection setup. Compression ratios of more than six are achieved while maintaining a high level of quality after experimental optical reconstruction.