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Speckle reduction for single sideband-encoded computer-generated holograms by using optimized carrier wave

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posted on 2024-01-09, 09:20 authored by Kyosik Min, Dabin Min, Jisoo Hong, Jae-Hyeung Park
Computer-generated holography (CGH) is an evolving field that facilitates three-dimensional displays, with speckle noise reduction being a pivotal challenge. In hologram synthesis, complex data with random phase distributions are typically employed as carrier waves for wide viewing angles and a shallow depth of field (DOF). However, these carrier waves are a source of speckle noise, which can significantly degrade image quality. In this paper, we propose a novel technique for speckle reduction for single sideband (SSB)-encoded holograms, applicable to any arbitrary 3D object. The proposed method focuses on optimizing the random carrier wave used in the hologram synthesis to achieve a uniform amplitude distribution at the object's location. This optimization results in a carrier wave that consistently exhibits uniform amplitude at specific depth planes, leading to a significant reduction of the speckle occurring from the carrier wave. The proposed method has been validated through simulations and optical experiments.

History

Funder Name

National Research Foundation of Korea (2022R1A2C2013455); Institute of Information & communications Technology Planning & Evaluation (2020-0-00548); Samsung Research Funding Center of Samsung Electronics (SRFC-IT1702-54)

Preprint ID

111415

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