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Edge extraction is an important pre-processing operation in image processing and pattern recognition in machine vision. For example, coherent optical image processing for edge detection can be performed in a standard 4-f system with proper pupil designs. The possibility of pre-processing using digital holography for 3D image edge extraction is intriguing. In this talk, we will review some of the edge detection techniques used in single-pixel digital holography called optical scanning holography (OSH). OSH is a two-pupil system and different edge detection schemes through the different combinations of pupils are discussed.
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Yaping Zhang, Yongwei Yao, Bin Wang, Houxin Fan, T.-C. Poon, "Review on edge extraction as pre-processing in optical scanning holography," Proc. SPIE 11898, Holography, Diffractive Optics, and Applications XI, 118980J (9 October 2021); https://doi.org/10.1117/12.2599682