23 December 2011 Coherent noise reduction in digital holographic phase contrast microscopy by varying the reference wave
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Abstract
Digital holography is widely used as a high resolution metrological technique in many domains. As a coherent imaging method, the speckle noise is inherent in the system and degrades image quality and optical resolution. An improved fiber-space-hybrid lensless Fourier-transform digital holography system is proposed. Multiple holograms are recorded with different oblique illumination. All hologram are reconstructed individually using the same program and each reconstructed image has a different speckle pattern. The oblique illumination system is optimized by an automatic two dimensional scanning of the fiber tip. Thus only a limited illumination area of light spot is demanded. By averaging the reconstructed images, the speckle noise of the reconstructed image is reduced. We demonstrate the effectiveness of the technique experimentally. The proposed system is convenient and practical. It can lead to a high quality result automatically.
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Yizhuo Zhang, Yizhuo Zhang, Dayong Wang, Dayong Wang, Yunxin Wang, Yunxin Wang, Zhiwei Zhou, Zhiwei Zhou, Jie Zhao, Jie Zhao, } "Coherent noise reduction in digital holographic phase contrast microscopy by varying the reference wave", Proc. SPIE 8204, Smart Nano-Micro Materials and Devices, 82042U (23 December 2011); doi: 10.1117/12.903597; https://doi.org/10.1117/12.903597
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