Tilt and displacement correction for digital holographic multi-aperture imaging

Bo Chen; Yusi Shan

doi:10.1117/12.2602683

9 October 2021 Tilt and displacement correction for digital holographic multi-aperture imaging

Bo Chen, Yusi Shan

Proceedings Volume 11896, Advanced Optical Imaging Technologies IV; 118961A (2021) https://doi.org/10.1117/12.2602683
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China

Abstract

For the distributed aperture synthesis imaging system based on digital holography, the influence of sub-aperture’s tilt and displacement on the synthetic aperture image is analyzed firstly, and then a correction method based on the image correlation and image sharpness optimization is proposed and validated by experiments. The tilt of the photo detector in the sub aperture leads to the displacement of the reconstructed target amplitude while the displacement leads to the piston, tilt and displacement of the reconstructed target amplitude. For the two errors, the image correlation method can be used to estimate the tilt and displacement values initially, and then the tilt and displacement values are iterated by the stochastic parallel gradient descent algorithm to improve the sharpness of synthetic aperture images. The experimental results show that the sharpness of synthetic aperture image are significantly improved after correction, but speckle noise has an obvious influence on the correction accuracy.

Citation Download Citation

Bo Chen and Yusi Shan "Tilt and displacement correction for digital holographic multi-aperture imaging", Proc. SPIE 11896, Advanced Optical Imaging Technologies IV, 118961A (9 October 2021); https://doi.org/10.1117/12.2602683

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KEYWORDS

Digital holography

Image quality

Holography

Sensors

Fourier transforms

Target detection

Digital imaging

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