Morphology and position measurement of irregular opaque particle with digital holography of side scattering

Li, Tianxiong; Wu, Yingchun; Wu, Xuecheng

doi:10.1016/j.powtec.2021.08.065

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…Digital holography (DH) uses CCD or COMS to record holograms, and with the help of computer programming, both the amplitude and phase information of recorded objects can be reconstructed. 1,2) DH has emerged as a low-cost and compact tool for the acquisition of two or three-dimensional (3D) information in various applications, such as DH microscopy, 3,4) particle field measurements, [5][6][7][8][9][10][11] etc. One of the outstanding advantages of DH is that it can simulate the diffraction process of object waves from the hologram plane to the reconstructed image plane through numerical calculations, and achieve a digitally focused reconstructed image from a single recorded digital hologram.…”

Section: Introductionmentioning

confidence: 99%

Autofocusing in off-axis digital Fresnel holography using S-th power weighted neighborhood correlation coefficient

Zhang,

Song,

Qiu

2023

Jpn. J. Appl. Phys.

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Accurately determining the focus plane of the reconstructed image is crucial for obtaining high-quality reconstructed images in the process of digital hologram reconstruction. In this paper, a focusing evaluation function based on S-th power weighted neighborhood correlation coefficient (SPWNCC) is proposed to realize automatic focusing of the reconstructed image in off-axis digital Fresnel holography. The Fresnel transform method is utilized as the off-axis digital holographic reconstruction algorithm. Both the numerical simulation and optical experiment results are given to verify the validity of the proposed autofocusing method. The obtained focusing curve can maintain good unimodality and noise immunity performance over a large search range (approximately 800 mm). The proposed SPWNCC based focusing evaluation function has a certain guiding significance on the automatic focusing of off axis digital holographic reconstructed images of long distance recorded objects.

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