Enhanced three-dimensional imaging with large depth of field using pre-processing in optical scanning holography

作     者：Yao, Yongwei Zhang, Yaping Duan, Jilu Poon, Ting-Chung 

作者机构： Yunnan Kunming650500 China Bradley Department of Electrical and Computer Engineering Virginia Tech BlacksburgVA24061 United States 

出 版 物：《Optics Express》 (Opt. Express)

年 卷 期：2025年第33卷第3期

页      面：5810-5822页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0822[工学-轻工技术与工程] 0702[理学-物理学] 

基　　金：National Natural Science Foundation of China (62275113) Yunnan Provincial Science and Technology Department (Xing Dian Talent Support Program) 

主　　题：Holograms 

摘      要：Optical scanning holography (OSH) emerges as a groundbreaking single-pixel real-time holographic recording technique, charting new territory beyond conventional digital holography. A notable challenge in OSH, as with all three-dimensional (3D) imaging methods, is the susceptibility of reconstructed images corrupted by defocus noise. The noise is an unintended result of diffraction on the focused plane from out-of-focus planes of the three-dimensional object, which can degrade image quality upon holographic reconstruction. Current methods, however, all use some algorithms to post-process holographic data to achieve the purpose of eliminating out-of-focus noise, which is difficult to meet the requirements of real-time image processing. We propose an innovative pre-processing approach in optical scanning holography that not only eliminates defocus noise but also significantly enhances image quality. Preprocessing is accomplished by the utilization of a focus-tunable lens (FTL) to refocus the optical scanning beam according to the depth of the occlusion-free object. Complex holograms are then captured without the artifacts associated with defocus through real-time holographic data pre-processing. Numerical simulations and experimental results demonstrate that our proposed method can directly obtain high-quality reconstructed images with all the 3D information being in focus simultaneously. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.