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1دورية أكاديمية
المؤلفون: Shu-Bin Liu, Bing-Kun Xie, Rong-Ying Yuan, Meng-Xuan Zhang, Jian-Cheng Xu, Lei Li, Qiong-Hua Wang
المصدر: PhotoniX, Vol 4, Iss 1, Pp 1-20 (2023)
مصطلحات موضوعية: Imaging system, Parallel camera, Compound eye, Computational imaging, Deep learning, Super resolution, Applied optics. Photonics, TA1501-1820
الوصف: Abstract High performance imaging in parallel cameras is a worldwide challenge in computational optics studies. However, the existing solutions are suffering from a fundamental contradiction between the field of view (FOV), resolution and bandwidth, in which system speed and FOV decrease as system scale increases. Inspired by the compound eyes of mantis shrimp and zoom cameras, here we break these bottlenecks by proposing a deep learning-based parallel (DLBP) camera, with an 8-μrad instantaneous FOV and 4 × computational zoom at 30 frames per second. Using the DLBP camera, the snapshot of 30-MPs images is captured at 30 fps, leading to orders-of-magnitude reductions in system complexity and costs. Instead of directly capturing photography with large scale, our interactive-zoom platform operates to enhance resolution using deep learning. The proposed end-to-end model mainly consists of multiple convolution layers, attention layers and deconvolution layer, which preserves more detailed information that the image reconstructs in real time compared with the famous super-resolution methods, and it can be applied to any similar system without any modification. Benefiting from computational zoom without any additional drive and optical component, the DLBP camera provides unprecedented-competitive advantages in improving zoom response time (~ 100 ×) over the comparison systems. Herein, with the experimental system described in this work, the DLBP camera provides a novel strategy to solve the inherent contradiction among FOV, resolution and bandwidth.
وصف الملف: electronic resource
العلاقة: https://doaj.org/toc/2662-1991Test
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2دورية أكاديمية
المؤلفون: Jianan Liu, Jing Cui, Haodong Shi, Qi Wang, Zhuang Liu, Yingchao Li, Peipei Wang, Qiang Fu, Chao Wang
المصدر: Photonics, Vol 10, Iss 11, p 1208 (2023)
مصطلحات موضوعية: lenslet-array integral field spectrometer, micro-pupil array, pre-imaging system, Applied optics. Photonics, TA1501-1820
الوصف: To address the problem of slit limitation in traditional slit imaging spectrometers, which hampers fast the identification, efficient tracking, and precise avoidance of faint targets in lunar orbit, this article proposes a lenslet-array integral field spectrometer structure that is free of slits, static, and that is fast and efficient for the visible-to-near-infrared wavelength band. Firstly, the field of view segmentation model is analyzed, and the requirement of the telecentric degree of the pre-imaging system is obtained. Secondly, the influence of aberrations, such as spherical aberration and coma distortion on the micro-pupil dispersion model is analyzed. Based on this, the pre-imaging system is designed to meet the requirements of aberration correction and the telecentricity of the system. Finally, the structure of the spectral system is designed, and the integrated system is optimized. The smile of the lenslet-array integral field spectrometer is ±1 nm, and the MTF is greater than 0.7 at 60 lp/mm and close to the diffraction limit.
وصف الملف: electronic resource
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3دورية أكاديمية
المؤلفون: Jiayu Wang, Haodong Shi, Yingchao Li, Qiang Fu, Yingjie Zhao, Huilin Jiang
المصدر: Photonics, Vol 10, Iss 8, p 929 (2023)
مصطلحات موضوعية: spectral polarization imaging system, polarization effect, polarimetric calibration, Mueller matrix, Applied optics. Photonics, TA1501-1820
الوصف: A polarization analysis method based on a multi-parameter model is proposed to address the polarization effect analysis and calibration requirements of a dual-coded snapshot spectral polarization imaging system. A full-link polarization effect model for a spectral polarization imaging system is established that includes a digital micromirror array (DMD), prism grating prism (PGP), micro-polarizer array detector (MPA), and multi-film. The influence of parameters such as the refractive index, incident angle, grating refractive index, constant, prism refractive index, vertex angle, multi-layer film complex refractive index, and film thickness on the optical transmittance of the system are analyzed. Using a dynamic data exchange mechanism to perform full-link, full-FOV, and full-pupil ray tracing on the optical system, the polarization effect distribution of the system under different degrees of polarization (DOP) and wavelengths is obtained. A calibration experiment for the controllable incident wavelength and DOP using narrowband filters and glass stacks is established. The experimental results show that in the 420 nm, 532 nm, and 635 nm wavelength bands, the MSEs of the calibrated values are 1.3924 × 10−4, 1.6852 × 10−4, and 1.6735 × 10−4, respectively. It is proven that the calibration method based on a multi-parameter model is feasible. Finally, the spectral polarization image at 532 nm is calibrated. The contrast ratio of metallic aluminum is calibrated from 7.13 to 15.33. This study provides a theoretical basis for the analysis and calibration of polarization effects in a dual-coded snapshot spectral polarization imaging system.
وصف الملف: electronic resource
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4دورية أكاديمية
المؤلفون: Changzheng Lu, Changhua Liu, Meng Shao, Zhiyong Wu, Chun Jiang, Jingtai Cao, Tao Chen
المصدر: Photonics, Vol 10, Iss 7, p 819 (2023)
مصطلحات موضوعية: space target detection, imaging system, sCMOS, vacuum cooling, Applied optics. Photonics, TA1501-1820
الوصف: The sCMOS imaging system with deep vacuum cooling technology has become a necessary way to improve the detection capability of space targets. In order to improve the detection capability of the photoelectric detection equipment for space targets, this paper developed the Highly Sensitive Deep Vacuum Cooling Imaging System (HSDVCIS). Firstly, we designed the imaging readout processing circuit using the GSENSE4040 sCMOS image sensor designed and manufactured by Gpixel and the deep vacuum cooling structure using thermoelectric cooling. Then, we tested the designed HSDVCIS with readout noise, dark current, and dynamic range of 3.96 e−, 0.12 e−/pixel/sec, and 84.49 dB, respectively, and tested the image sensor with a minimum cooling temperature of −40 °C. Finally, according to the results of observation experiments, we validated that the photoelectric detection equipment equipped with HSDVCIS improved the limiting detection magnitude (at SNR = 5 level) from 13.22 to 13.51 magnitudes within a 3 s exposure time by turning on the cooling function. Therefore, HSDVCIS designed in this paper can achieve highly sensitive detection of space targets. At the same time, the development of HSDVCIS also provides technical reserves and strong support for future research on the imaging systems using multiple image sensor mosaics.
وصف الملف: electronic resource
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5دورية أكاديمية
المؤلفون: Rui Sun, Jiale Long, Yi Ding, Jiaye Kuang, Jiangtao Xi
المصدر: Photonics, Vol 10, Iss 4, p 395 (2023)
مصطلحات موضوعية: imaging system, computational imaging, single-pixel imaging, image reconstruction, Applied optics. Photonics, TA1501-1820
الوصف: Hadamard single-pixel imaging (SPI) employs the differential measurement strategy to eliminate the effect of negative value of Hadamard basis patterns but leads to doubling the number of measurements. To reduce the number of measurements, a Hadamard SPI method based on positive patterns is proposed. In this method, only the positive patterns are used to acquire measurement values and reconstruct images, so the number of measurements will be reduced by 1/2. Combined with the intensity correlation theory of ghost imaging, the average value of the acquired measures is found; this average value is subtracted from all the measurement values to obtain the spectral coefficients, thus the background noise is eliminated to ensure the imaging quality. Simulation and experimental results show that the proposed method has good noise robustness and can efficiently reconstruct high quality images.
وصف الملف: electronic resource
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6دورية أكاديمية
المؤلفون: Yueqi Zhai, Jiaqi Niu, Jingquan Liu, Bin Yang
المصدر: International Journal of Optomechatronics, Vol 15, Iss 1, Pp 160-169 (2021)
مصطلحات موضوعية: compound eyes, precision engraving, imaging system, microlens array, Materials of engineering and construction. Mechanics of materials, TA401-492, Applied optics. Photonics, TA1501-1820
الوصف: A bionic artificial compound eye manufactured on a concave mold with precision engraving method for imaging, which allows for the rapid fabrication of large-scale compound eyes at a low cost. Thousands of concave structures are accurately machined and positioned omnidirectionally in concentric rings with a minimum diameter of 100 μm on a hemisphere. The PDMS ommatidia can be obtained once replicated, which can greatly improve preparation efficiency, and the peel-off process can also be optimized by alcohol ultrasonic without edge damage. The optical performance and field of view of the artificial compound eye are also investigated, and the experimental results are around 120°. Furthermore, the combination of the prepared compound eye and the commercial CMOS camera successfully captures images of different shapes.
وصف الملف: electronic resource
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7دورية أكاديمية
المؤلفون: Sensen Song, Zhenhong Jia, Jie Yang, Nikola K. Kasabov
المصدر: IEEE Photonics Journal, Vol 12, Iss 5, Pp 1-16 (2020)
مصطلحات موضوعية: Imaging system, image segmentation, neutrosophic set theory, saliency map, the method of threshold, Applied optics. Photonics, TA1501-1820, Optics. Light, QC350-467
الوصف: Due to more or less deviations in the imaging system, there will be noise in the image, which makes the image segmentation inaccurate. To divide a natural image into a more accurate binary image, the target and background of the image are effectively separated to achieve a more effective segmentation result. Therefore, this paper proposes an image segmentation algorithm combining a saliency map and neutrosophic set (NS) theory. First, to overcome the problem of weak edges in the image, we highlight the details and use the guided filter to filter the various channels of the natural image. Then, the initial saliency map is generated. After the weighted superposition of the initial saliency map, the local entropy map and the gray scale map, the final saliency map can be generated using the nonlinear function, and it can effectively highlight the foreground information of the image. Second, the saliency map is transformed to the NS domain and interpreted by three subsets: true (T), indeterminate (I), and false (F). According to NS theory, the indeterminacy is reduced, and the segmentation results are finally obtained by using the method of threshold. Various experiments were done and compared with other state-of-the-art approaches. These experiments demonstrate the effect of the proposed work, which is fast and effective for de-noising.
وصف الملف: electronic resource
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8دورية أكاديمية
المؤلفون: Chengyang Hu, Sigang Yang, Minghua Chen, Hongwei Chen
المصدر: IEEE Photonics Journal, Vol 12, Iss 2, Pp 1-8 (2020)
مصطلحات موضوعية: Optical snapshot, imaging system, Applied optics. Photonics, TA1501-1820, Optics. Light, QC350-467
الوصف: Higher dimensional optical imaging has seen remarkable growth in the past decade. As a representative method, multiplexed structured illumination (MSI) has been widely introduced for its ultra-high resolution of high-dimensional information. In this letter, an imaging framework for recovering higher dimensional image data, which terms quadrature multiplexed structured illumination (QMSI), is proposed and demonstrated. QMSI incorporates the illumination pattern spatial phase information as a new parameter into the encoding process. This strategy can double the frequency spectrum utilization without any overhead compared to MSI, which means it can double the image sequence depth or image spatial resolution. As a proof of concept, we demonstrate the performance of QMSI by experiments on multispectral imaging.
وصف الملف: electronic resource
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9دورية أكاديمية
المصدر: Photonics, Vol 9, Iss 8, p 534 (2022)
مصطلحات موضوعية: imaging system, freeform, multi-mirror, Applied optics. Photonics, TA1501-1820
الوصف: A data point calculation method that does not require the use of Fermat′s principle and a simple and general design method of starting points of freeform off-axis multi-mirror optical systems are proposed in this paper, which aim to promote the realization of high-performance reflective systems containing freeform surfaces. Taking a planar system and the required parameters as the input, a good starting point for a freeform off-axis multi-mirror system can be automatically obtained using the proposed method. The design of a freeform off-axis five-mirror system with a low F-number is taken as an example to show the effectiveness of the proposed method. The method can also be used for the design of freeform reflective systems with other numbers of mirrors.
وصف الملف: electronic resource
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10دورية أكاديمية
المصدر: Photonics, Vol 9, Iss 5, p 326 (2022)
مصطلحات موضوعية: imaging system, freeform surface, nonsymmetric system, three-mirror off-axis, Applied optics. Photonics, TA1501-1820
الوصف: In this manuscript, we have launched a study on the completely nonsymmetric freeform optical system with neither rotational symmetry nor planar symmetry. An off-axis three-mirror freeform optical system with nonsymmetric geometry is proposed and a direct design method is developed for the nonsymmetric freeform optical system. The design field points are sampled across the full FOV to control the imaging quality and object–image relationship. In this system, the center of the image plane is greatly away from the plane determined by the centers of the three mirrors. This nonsymmetric system with F/1.3, a focal length of 50 mm, and an 8° × 6° field of view can achieve imaging quality close to the diffraction limit. This work provides a feasible nonsymmetric system design idea for the optical community.
وصف الملف: electronic resource
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