- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2018 IEEE International Conference on Consumer Electronics - Asia (ICCE-Asia) - Jeju (2018.6.24-2018.6.26)] 2018 IEEE International Conference on Consumer Electronics - Asia (ICCE-Asia) - Robust HDR Video Synthesis Using Superpixel-Based Illumination Invariant Motion Estimation
摘要： We propose a novel high dynamic range (HDR) video synthesis algorithm from alternatively exposed low dynamic range (LDR) videos. We first develop a superpixel-based motion estimation technique using an illumination-invariant feature descriptor. Then, we merge the warped frames to obtain the HDR frame. Experimental results demonstrate that the proposed algorithm provides high-quality HDR videos compared to state-of-the-art algorithms.
关键词： High dynamic range (HDR) video,HDR imaging
更新于2025-09-19 17:15:36
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[IEEE 2018 International Conference on Information and Communication Technology Convergence (ICTC) - Jeju (2018.10.17-2018.10.19)] 2018 International Conference on Information and Communication Technology Convergence (ICTC) - Deep Inverse Tone Mapping Optimized for High Dynamic Range Display
摘要： The popularity of high dynamic range (HDR) makes the inverse tone mapping become an important technique for HDR display. In this paper, we propose a convolutional neural network (CNN) based inverse tone mapping method to generate a high-quality HDR image from one single standard dynamic range (SDR) image. First, we present a CNN design with a three-channel input, which considers both luminance and chrominance. Second, we propose to use overlapped inputs to remove the boundary artifacts, caused by zero padding in CNN. Experimental results demonstrate the high quality of our generated HDR images compared to the ground truth and conventional inverse tone mapping methods.
关键词： inverse tone mapping,high dynamic range imaging,convolutional neural networks
更新于2025-09-19 17:15:36
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A Wide Dynamic Range NUC Algorithm for IRCS Systems
摘要： Uniformity is a key feature of state-of-the-art infrared focal planed array (IRFPA) and infrared imaging system. Unlike traditional infrared telescope facility, a ground-based infrared radiant characteristics measurement system with an IRFPA not only provides a series of high signal-to-noise ratio (SNR) infrared image but also ensures the validity of radiant measurement data. Normally, a long integration time tends to produce a high SNR infrared image for infrared radiant characteristics radiometry system. In view of the variability of and uncertainty in the measured target’s energy, the operation of switching the integration time and attenuators usually guarantees the guality of the infrared radiation measurement data obtainted during the infrared radiant characteristics radiometry process. Non-uniformity correction (NUC) coe?cients in a given integration time are often applied to a speci?ed integration time. If the integration time is switched, the SNR for the infrared imaging will degenerate rapidly. Considering the e?ect of the SNR for the infrared image and the infrared radiant characteristics radiometry above, we propose a-wide-dynamic-range NUC algorithm. In addition, this essasy derives and establishes the mathematical modal of the algorithm in detail. Then, we conduct veri?cation experiments by using a ground-based MWIR(Mid-wave Infared) radiant characteristics radiometry system with an ?400 mm aperture. The experimental results obtained using the proposed algorithm and the traditional algorithm for di?erent integration time are compared. The statistical data shows that the average non-uniformity for the proposed algorithm decreased from 0.77% to 0.21% at 2.5 ms and from 1.33% to 0.26% at 5.5 ms. The testing results demonstrate that the usage of suggested algorithm can improve infrared imaging quality and radiation measurement accuracy.
关键词： Infrared radiation,Cooling infrared focal plane array,Non-uniformity correction,Wide dynamic range
更新于2025-09-19 17:15:36
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Ultrafast and broadband photodetectors based on a perovskite/organic bulk heterojunction for large-dynamic-range imaging
摘要： Organic-inorganic hybrid perovskite (OIHP) photodetectors that simultaneously achieve an ultrafast response and high sensitivity in the near-infrared (NIR) region are prerequisites for expanding current monitoring, imaging, and optical communication capabilities. Herein, we demonstrate photodetectors constructed by OIHP and an organic bulk heterojunction (BHJ) consisting of a low-bandgap nonfullerene and polymer, which achieve broadband response spectra up to 1 μm with a highest external quantum efficiency of approximately 54% at 850 nm, an ultrafast response speed of 5.6 ns and a linear dynamic range (LDR) of 191 dB. High sensitivity, ultrafast speed and a large LDR are preeminent prerequisites for the practical application of photodetectors. Encouragingly, due to the high-dynamic-range imaging capacity, high-quality visible-NIR actual imaging is achieved by employing the OIHP photodetectors. We believe that state-of-the-art OIHP photodetectors can accelerate the translation of solution-processed photodetector applications from the laboratory to the imaging market.
关键词： Organic-inorganic hybrid perovskite,ultrafast response,photodetectors,high-dynamic-range imaging,broadband response,near-infrared
更新于2025-09-19 17:13:59
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Automotive 3.0 ?μm Pixel High Dynamic Range Sensor with LED Flicker Mitigation
摘要： We present and discuss parameters of a high dynamic range (HDR) image sensor with LED flicker mitigation (LFM) operating in automotive temperature range. The total SNR (SNR including dark fixed pattern noise), of the sensor is degraded by floating diffusion (FD) dark current (DC) and dark signal non-uniformity (DSNU). We present results of FD DC and DSNU reduction, to provide required SNR versus signal level at temperatures up to 120°C. Additionally we discuss temperature dependencies of quantum efficiency (QE), sensitivity, color effects, and other pixel parameters for backside illuminated image sensors. Comparing +120°C junction vs. room temperature, in visual range we measured a few relative percent increase, while in 940 nm band range we measured 1.46x increase in sensitivity. Measured change of sensitivity for visual bands—such as blue, green, and red colors—reflected some impact to captured image color accuracy that created slight image color tint at high temperature. The tint is, however, hard to detect visually and may be removed by auto white balancing and temperature adjusted color correction matrixes.
关键词： temperature dependence,sensitivity,LED flicker mitigation,quantum efficiency,automotive,CMOS,high dynamic range,image sensor
更新于2025-09-19 17:13:59
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Rapid and wide-range detection of NO <sub/>x</sub> gas by N-hyperdoped silicon with the assistance of a photovoltaic self-powered sensing mode
摘要： Wide dynamic range NOx sensors are vital for environment and health purposes, but few sensors could achieve wide range detection with ultralow and ultrahigh concentrations at the same time. In this article, the microstructured and nitrogen-hyperdoped silicon (N-Si) for NOx gas sensing is investigated systematically. Working by the change of surface conductivity, the sensor is ultra-sensitive to low concentration of NOx down to 11 ppb, and shows a rapid response/recovery time of 22/33 s for 80 ppb. When NOx concentration increases and exceeds a threshold value (10–50 ppm), an n–p conduction type transition is observed due to the inversion of the conduction type of major carriers, which limits the sensor’s dynamic range at high concentration. However, when the sensor works in a photovoltaic self-powered mode under the asymmetric light illumination (ALI), the limitation can be successfully overcome. Therefore, with the combination of the two working principles, a wide dynamic range stretching over six orders of magnitude (~0.011–4,000 ppm) can be achieved.
关键词： dynamic range,conduction type transition,asymmetric light illumination,hyperdoped silicon,self-powered gas sensing
更新于2025-09-19 17:13:59
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Industrial Applications of Nanomaterials || Nanomaterials-based UV photodetectors
摘要： Photodetectors are essential elements applied in video imaging, optical communications, biomedical imaging, security, night-vision, gas sensing, and motion detection, which possess the ability to transform light into electrical signals precisely. As the scale and diversity of application areas are growing, the need for innovative photodetection platform technologies with higher performance in terms of speed, efficiency or wavelength range, as well as material flexibility, transparency, and complementary metal-oxide-semiconductor (CMOS) integrability, is becoming more critical. In the past decades, extensive efforts have been devoted to explore the next generation of photodetector materials, such as In2Te3, ZnO, and GaN, with low noise, high photosensitivity, and good stability. However, many of these novel photodetector materials still suffer from limited photocurrent and photoresponse speed.
关键词： Nanomaterials,Schottky contacts,photoconductive gain,photodetection mechanism,photoresistors,linear dynamic range,responsivity,external quantum efficiency,photodiodes,specific detectivity,UV photodetectors
更新于2025-09-19 17:13:59
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Experimental Methods for Studying the Power Contrast of Laser Radiation
摘要： The streak-camera method for measuring the laser radiation (LR) front pro?le with a large dynamic range and the method for measuring the power contrast based on photodiodes are described. The results of the implementation of these measurement methods at the “Luch” facility of the RFNC–VNIIEF using the SER-5 streak camera developed by the authors and specially developed optical schemes are presented. The results of measurements of the LR power contrast, performed in power experiments and demonstrating the possibility of measuring deep pro?les of pulses with a dynamic range to 106 and 109 and a time resolution of 250 ps and 70 ps (at the ?rst and second harmonics, respectively) are presented.
关键词： dynamic range,streak camera,power contrast
更新于2025-09-19 17:13:59
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[IEEE 2018 International Computers, Signals and Systems Conference (ICOMSSC) - Dalian, China (2018.9.28-2018.9.30)] 2018 International Computers, Signals and Systems Conference (ICOMSSC) - Three-Dimensional Pulse Electric Field Test System with Optical Fiber
摘要： A three-dimensional pulse electric field system with optical fiber is developed. It is made up of electric field testing probe, optical transmission system, optical receiver and display, which can realize three-dimensional pulse electric field measurement in the whole space. This paper introduced the three-Dreceiving antenna, the three-D electric field signal synthesis and photoelectric receiver and then analyzed the design of the three-D receiving antenna and the method of three dimensional electric field synthesis. At last, the performance of the testing system is measured. Results show that the system has good test performance whose bandwidth can reach 1KHz-1GHz, dynamic range can be up to 60dB.
关键词： dynamic range,3-D electric field sensor,bandwidth test,Pulse electric field
更新于2025-09-19 17:13:59
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Quantum-Efficiency and Bandwidth Optimized Electro-Optic Sampling
摘要： Electro-optic sampling (EOS) allows for field-sensitive detection of optical waveforms in a broad spectral range, extending from the far-infrared (THz) all the way to the near-infrared. Most recently, EOS has been employed for highly sensitive spectroscopy of liquids and gases in the mid-infrared (MIR) molecular fingerprint region, overcoming the notorious limitations of broadband detectors in this spectral range and providing a glance at the potential of this coherent detection scheme for molecular spectroscopy. In this paper, we investigate – in theory and experiment – the trade-off between quantum-efficiency/dynamic range (DR) and detection-bandwidth in EOS. The theoretical model describes the two-step-process of the EOS detection in one dimension, where the nonlinear up-conversion is calculated with the first order propagation equation, followed by heterodyne detection of the generated sum-frequency field with a strong gate pulse. In a first experiment, we sample an octave-spanning spectrum centred at 8.6 μm, using high-power, 16-fs pulses spectrally centred at 1030 nm. We show a frequency up-conversion-efficiency of 2%, which is unprecedented in EOS, measured as the maximum delay-dependent MIR power decrease behind the EOS crystal (500-μm thick GaSe). On the other hand, the maximum MIR depletion is only 0.3% for a 85-μm thick crystal, which is due to the shorter interaction length. However, this thinner crystal greatly benefits the detection bandwidth, as can be seen from the simulations. As our heterodyne detection with unprecedented local oscillator powers (450 mW at 28 MHz) is shot-noise-limited, this conversion efficiency results in an unprecedented amplitude DR of 6.5×106 (for 20 s of measurement time). This DR directly benefits spectroscopic measurements with unprecedented sensitivities. Our simulations show beneficial phase matching for sampling pulses centred at 2 μm. Therefore, the bandwidth-DR trade-off is expected to be less severe and we are currently investigating the 2 μm-based detection experimentally.
关键词： heterodyne detection,quantum-efficiency,dynamic range,bandwidth,Electro-optic sampling
更新于2025-09-16 10:30:52