Digital holography-assisted 3-D bright-field image reconstruction and refocusing
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Digital holography‑assisted 3‑D bright‑field image reconstruction and refocusing Syukran Hakim Bin Norazman1 · Tomoya Nakamura1,2 · Masahiro Yamaguchi1 Received: 12 March 2020 / Accepted: 8 August 2020 © The Optical Society of Japan 2020
Abstract We propose an image reconstruction technique of a color 3-D object to perform image refocusing by combining information from bright-field image and digital holography. The key concept is first to reconstruct the 3-D object using compressive holography. Next, a binary mask is created to separate objects and transparent voxels. Then, the mask is used to assist the 3-D color object reconstruction from a bright-field image. Finally, image refocusing can be performed by convolving the 3-D object with an incoherent point spread function. We demonstrated the proposed method by conducting a simulation of two different objects. In both simulations, the reconstructed objects give good agreement with ground truth.
1 Introduction Recently, digital image refocusing was made possible through light-field (LF) imaging technology. It enables the focus adjustment after an image is captured, and the LF camera that uses a microlens array has been commercialized. Another approach for digital refocusing is to capture focal-stack. Digital image refocusing is useful not only in consumer cameras, but also in digital microscopy applications in which thick samples need to be captured. Despite the advantage of the digital refocusing technique, there is a trade-off between spatial resolution and angular resolution in LF imaging, and longer shooting time is required for focalstack capturing [1]. From a wave optics perspective, LF imaging can be regarded as a counterpart to holography, i.e., the complete recording of light that contains both amplitude and phase information. Similar to LF, the technique of digital holography (DH) can be used to reconstruct the image at a different Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10043-020-00615-7) contains supplementary material, which is available to authorized users. * Syukran Hakim Bin Norazman [email protected] 1
School of Engineering, Tokyo Institute of Technology, 4259‑G2‑28 Nagatsuta, Midori‑ku, Yokohama, Kanagawa 226‑8502, Japan
PRESTO, Japan Science and Technology Agency, Chiyoda‑ku, Tokyo 102‑0075, Japan
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plane by calculating the light propagation [2]. Although image refocusing is possible via DH, the out of focus planes yield diffraction patterns due to its coherent propagation kernel, and the resulting image blur is different from the normal image captured using a common incoherent system. Therefore, the observed image is unnatural, and the diffraction pattern may cause a spurious structure. In this paper, we propose a new image reconstruction technique that combines a single bright-field (BF) and DH for digital refocusing. The proposed method will enable color BF image refocusing without the need of capturing z-stack images. The key idea is to use a compressive
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