Real-Time Incoherent Digital Holography System Using an Embedded Graphic Processing Unit

Incoherent digital holography (IDH) is a technique that enables single-shot three-dimensional (3D) imaging by recording holograms with incoherent light, such as sunlight and LEDs. IDH is expected to be a next-generation 3D measurement technique, but there are two challenges: speeding up both denoising required for IDH due to insufficient light and the diffraction calculations required to obtain reconstructed images. We propose a real-time IDH system in which single-exposure phase-shifting digital holography, which can record multiple phase-shifted holograms in a single exposure, is combined with an embedded graphic processing unit (GPU). The proposed system enables real-time color imaging of the real world from incoherent holograms with
$2448 \times 2048$
pixels while reducing noise at 21.2 frames per second. The effect of the denoising was evaluated by speckle contrast, showing that noises were well reduced. Compared to five existing studies using field programable gate arrays and GPUs, the proposed system is capable of computing large hologram reproduction at high speed. The proposed system is a prototype for future incoherent holographic cameras.