Showing papers by "Osamu Matoba published in 2023"
TL;DR: In this article , the van Cittert-Zernike theorem was used to image a moving object in a random light field using a measured complex coherence function through a polarization camera, which is calculated from auto-correlation and cross correlation functions of phase-shifted speckle intensity distributions.
Abstract: To see through a random light field in real-time, single-shot generalized Hanbury Brown–Twiss experiments using a polarization camera are proposed. The target intensity distribution is obtained from a complex coherence function which is calculated from auto-correlation and cross correlation functions of phase-shifted speckle intensity distributions. The phase-shifted speckle intensity distributions are simultaneously obtained through a strategy of parallel phase-shifting digital holography. Experimental results show that the proposed method can image a moving object in a random light field using a measured complex coherence function through the van Cittert–Zernike theorem.
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TL;DR: Based on the characteristics of the electronic circuit including the LED and PD, the authors theoretically formulated the fundamental equations for the circuit based on Kirchhoff's Law and V-I characteristics of LEDs and PD.
Abstract: In 1989, B.J. Van Zeghbroeck et al., who was working for IBM Research Center at that time, announced the notion of PTT (Photon Transport Transistor) as an optical coupling device of light emitting diode (LED) and light receiving diode (Photo Diode, PD), where the carrier of the base layer is light (Photon) only. Later, it was theoretically shown that PTT has an amplification function in a positive feedback circuit and works as an extremely low-noise transistor element. In this paper, based on the characteristics of the electronic circuit including the LED and PD, we discuss the expression of the amplification function of the PTT positive feedback circuit. First, we theoretically formulate the fundamental equations for the circuit based on Kirchhoff’s Law and V-I characteristics of LED and PD. Second, we perform the actual circuit operation experiments of PTT positive feedback circuit. Lastly, we analyze the expression of amplification function and its operational behavior based on the measured values in the experiments, using approximated characteristic equations of LED and PD.
TL;DR: In this paper , the authors used U-net as a deep learning model to improve the quality of reconstructed images, and constructed an optical system that integrates a light-field microscope and an epifluorescence microscope, which acquired the light field data and high-resolution two-dimensional images, respectively.
Abstract: Light-field three-dimensional (3D) fluorescence microscopes can acquire 3D fluorescence images in a single shot, and followed numerical reconstruction can realize cross-sectional imaging at an arbitrary depth. The typical configuration that uses a lens array and a single image sensor has the trade-off between depth information acquisition and spatial resolution of each cross-sectional image. The spatial resolution of the reconstructed image degrades when depth information increases. In this paper, we use U-net as a deep learning model to improve the quality of reconstructed images. We constructed an optical system that integrates a light-field microscope and an epifluorescence microscope, which acquire the light-field data and high-resolution two-dimensional images, respectively. The high-resolution images from the epifluorescence microscope are used as ground-truth images for the training dataset for deep learning. The experimental results using fluorescent beads with a size of 10 µm and cultured tobacco cells showed significant improvement in the reconstructed images. Furthermore, time-lapse measurements were demonstrated in tobacco cells to observe the cell division process.
TL;DR: In this paper , the van Cittert-Zernike theorem was used to image a moving object in a random light field using a measured complex coherence function through a polarization camera, which is calculated from auto-correlation and cross correlation functions of phase-shifted speckle intensity distributions.
Abstract: To see through a random light field in real-time, single-shot generalized Hanbury Brown-Twiss experiments using a polarization camera are proposed. The target intensity distribution is obtained from a complex coherence function which is calculated from auto-correlation and cross correlation functions of phase-shifted speckle intensity distributions. The phase-shifted speckle intensity distributions are simultaneously obtained through a strategy of parallel phase-shifting digital holography. Experimental results show that the proposed method can image a moving object in a random light field using a measured complex coherence function through the van Cittert-Zernike theorem.
TL;DR: The Feature Issue of Optics Express is organized in conjunction with the 2022 Optica conference on 3D Image Acquisition and Display: Technology, Perception and Applications which was held in hybrid format from 11 to 15, July 2022 as part of the Imaging and Applied Optics Congress and Optical Sensors and Sensing Congress 2022 in Vancouver, Canada as discussed by the authors .
Abstract: This Feature Issue of Optics Express is organized in conjunction with the 2022 Optica conference on 3D Image Acquisition and Display: Technology, Perception and Applications which was held in hybrid format from 11 to 15, July 2022 as part of the Imaging and Applied Optics Congress and Optical Sensors and Sensing Congress 2022 in Vancouver, Canada. This Feature Issue presents 31 articles which cover the topics and scope of the 2022 3D Image Acquisition and Display conference. This Introduction provides a summary of these published articles that appear in this Feature Issue.