Fast computation of image-reconstruction process of high-speed parallel phase-shifting digital holography

We present a fast computational system for high-speed parallel phase-shifting digital holography. The image reconstruction process of parallel phase-shifting digital holography consists of the following processes: decomposition of recorded phase-shifted hologram, interpolation of vacant pixels in decomposed holograms, phase-shifting interferometry, and light propagation. We accelerated phase-shifting interferometry and light propagation processes, whose computational load was much heavier than that of the others, by a graphics processing unit (GPU). We adopted Compute Unified Device Architecture (CUBA) as a software development environment. A GPU with CUDA can achieve 6.3× and 9.0× faster computational times in phase-shifting interferometry and light propagation processes than a CPU, respectively.