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In a recent study, researchers developed a portable digital holographic camera system that can obtain full-color digital holograms of objects illuminated with spatially and temporally incoherent light in a single exposure. They employed a deep-learning-based denoising algorithm to suppress random noise in the image-reconstruction procedure, and succeeded in video-rate full-color digital holographic motion-picture imaging using a white LED.

The camera they developed is palm-sized, weighs less than 1 kg, operates on a table with wheels, does not require antivibration structures, and obtains incoherent motion-picture holograms under the condition of close-up recording.

The research is in the journal Advanced Devices & Instrumentation.

A single-shot full-color holographic image recording of a hand-sized reflective object was performed with the developed camera, and image-quality improvement by applying the designed image reconstruction procedure was experimentally demonstrated. A full-color holographic motion-picture recording of a dynamically moving 3D object was also demonstrated at the frame rate of 22 fps. Experimental results revealed that the developed holographic camera successfully works under the conditions of spatially incoherent continuous-wavelength white-light illumination, set on a moving body, and with close-up recording.

This work presents a single-shot full-color digital holographic camera that is portable by hand and operates with continuous-wavelength white-light illumination from an LED. Experimental results demonstrate video-rate full-color holographic motion-picture imaging of a dynamically moving 3D object. The image-reconstruction procedure employing a deep-learning-based denoising algorithm successfully improved the quality of the reconstructed images. The study also discussed how to improve the specifications of the holographic camera.