外文题目: Fast autofocusing in digital holography using the magnitude differential
作者: Lyu, Meng; Yuan, Caojin; Li, Dayan; Situ, Guohai
刊名: Appl. Optics
年: 2017 卷: 56 期: 13 页： F152--F157
英文关键词:

PHASE-CONTRAST MICROSCOPY; FOCUS MEASURE; RECONSTRUCTION; WAVELENGTH; CRITERION; OBJECTS; PLANE; SIZE
英文摘要:
Typical methods of automatic estimation of focusing in digital holography calculate every single reconstructed frame to get a critical function and then ascertain the focal plane by finding the extreme value of that function. Here, we propose a digital holographic autofocusing method that computes the focused distance using the first longitudinal difference of the magnitude of the reconstructed image. We demonstrate the proposed method with both numerical simulations and optical experiments of amplitude-contrast and phase-contrast objects. The results suggest that the proposed method performs better than other existing methods, in terms of applicability and computation efficiency, with potential applications in industrial and biomedical inspections where automatic focus tracking is necessary. (C) 2017 Optical Society of America


文献类型: 期刊论文
正文语种: English
收录类别: SCI
DOI: 10.1364/AO.56.00F152


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