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基于局部区域模式噪声的数字图像源辨识算法 被引量:2
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作者 胡达 胡永健 刘琲贝 《合肥工业大学学报(自然科学版)》 CAS CSCD 北大核心 2012年第10期1335-1340,共6页
数码相机的传感器模式噪声可以作为相机指纹实现数字图像源辨识。针对模式噪声的提取效果对图像内容有较大的依赖性,文章发现亮度高纹理简单的区域模式噪声质量较高。因此,首先根据图像的纹理和亮度设计一个评估函数,用该函数对测试图... 数码相机的传感器模式噪声可以作为相机指纹实现数字图像源辨识。针对模式噪声的提取效果对图像内容有较大的依赖性,文章发现亮度高纹理简单的区域模式噪声质量较高。因此,首先根据图像的纹理和亮度设计一个评估函数,用该函数对测试图像每个块进行评估,选择出亮度高纹理简单的区域;最后利用选择区域的模式噪声,使用相关性检测器实现数字图像源辨识。实验证明了基于局部区域模式噪声的数字图像源辨识算法的有效性和优越性。 展开更多
关键词 数字图像源辨识 模式噪声 亮度高纹理简单 评估函数 相关性检测
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LED电子显示屏的设计现状探讨 被引量:1
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作者 王明 《科技创新与应用》 2016年第9期102-102,共1页
自改革开放以来,我国的科技水平不断提升,LED作为一种高科技的电子产品,之泛应用于各行各业,满足人们生产生活的要求。文章主要基于LED电子显示屏的设计现状进行了探讨,并介绍了LED显示屏由LED矩阵块组成,分为图文显示屏和视频显示屏。
关键词 超大的画面 亮度高 工作寿命长 超强视觉 灵活多变 工作电压低 微型化 性能稳定 耐冲击
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On High Brightness Temperature of Pulsar Giant Pulses
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作者 Victor M. Kontorovich 《Journal of Physical Science and Application》 2015年第1期48-60,共13页
A wide range of events observed at the giant pulses (high energy density, observed localization of giant pulses GPs relative to the average pulse, fine structure of GPs with duration up to some nanoseconds, observed ... A wide range of events observed at the giant pulses (high energy density, observed localization of giant pulses GPs relative to the average pulse, fine structure of GPs with duration up to some nanoseconds, observed circular polarization of GPs, correlation between the GP phase and the phase of the hard pulsar emission X-ray and gamma) can be explained from the viewpoint that the internal polar gap is a cavity-resonator stimulated by discharges and radiating through the breaks in the magnetosphere. The new results in this field [the electromagnetic (era) waves generation in the gap in the process of longitudinal acceleration in the electric field vanishing on the star surface, high frequency break in the spectrum as a result of switching off this generation, formation in this process a power-low spectrum with a high frequency (hf) break, the possibility determination of pulsar magnetic field by the hf break position, the difference between main pulse and inter pulse mechanism generation, quantization of em tornado rotation in the gap and appearance of the bands in the inter pulse spectrum, influence the high energy density in the gap on pair generation and position of the dead line in pulsars] are added in the intermediate epilogue. 展开更多
关键词 PULSARS giant pulses inner gap cavity-resonator spark rotation electromagnetic tornado.
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Wildlife Deterrence from Hazards Using High Brightness Ultraviolet Light
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作者 Donald J. Ronning 《Journal of Chemistry and Chemical Engineering》 2016年第3期109-119,共11页
The purpose of this study was to examine the behavioral impact of varying LED (light emitting diode) spectral emissions on avian species. A novel oculo-neuro-motor response to monochromatic LEDs has been identified.... The purpose of this study was to examine the behavioral impact of varying LED (light emitting diode) spectral emissions on avian species. A novel oculo-neuro-motor response to monochromatic LEDs has been identified. LED colored light of sufficient intensity matched to the short-wavelength cones of avian species can efficiently diminish overall visual perception leading to an augmented behavioral response. The study method involved monitoring the change in behavioral response after exposure to high brightness monochromatic LED light to wild Osprey (Pandion haliaetus) foraging and nesting in their natural environment. Our results demonstrated a statistically significant change in foraging behaviors with wild Osprey (p = 0.005) and in nesting behavior as a result of exposure to high brightness monochromatic LED light. An augmented behavioral responses was observed which is believed to be analogous to human reaction to solar glare and glint. The neuroimaging mechanism of avian species is discussed. This novel augmented behavioral response provides a new technique of studying the neuroscience of temporal and spatial light stimulus. A non-lethal deterrence technique involving the augmented behavioral response could mitigate mortality and morbidity of avian-human conflict in areas such as airports, airplane bird strikes, and wind turbines. 展开更多
关键词 Avian vision ultraviolet LED non-lethal deterrence solar glare solar glint.
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国内首次实现1.9~4.3μm全光纤中红外超连续谱光源 被引量:5
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作者 张斌 杨未强 +1 位作者 侯静 姜宗福 《中国激光》 EI CAS CSCD 北大核心 2012年第12期4-4,共1页
中红外(Mid—IR)超连续谱激光器具有光谱宽、空间相干性好和亮度高的优点,在光学测量、分子光谱学、生物医学成像以及光学生物组织蚀除等方面有着广泛的应用,因此成为超连续谱领域的研究热点之一。
关键词 中红外 光谱宽 空间相干性好 亮度高
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LED电子显示屏的设计现状探讨 被引量:1
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作者 邵亮 《电子乐园》 2022年第2期7-9,共3页
自改革开放以来 , 我国的科技水平不断提升 ,LED 作为一种高科技的电子产品 , 之泛应用于各行各业 ,满足人们生产生活的要求。文章主要基于 LED 电子显示屏的设计现状进行了探讨 , 并介绍了 LED 显示屏由 LED 矩阵块组成 , 分为图文显... 自改革开放以来 , 我国的科技水平不断提升 ,LED 作为一种高科技的电子产品 , 之泛应用于各行各业 ,满足人们生产生活的要求。文章主要基于 LED 电子显示屏的设计现状进行了探讨 , 并介绍了 LED 显示屏由 LED 矩阵块组成 , 分为图文显示屏和视频显示屏。 展开更多
关键词 超大的画面 亮度高 工作寿命长 超强视觉 灵活多变 工作电压低 微型化 性能稳定 耐冲击
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High efficiency organic light-emitting diodes using CuO_x/Cu dual buffer layers 被引量:3
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作者 陈征 邓振波 《Optoelectronics Letters》 EI 2015年第3期187-190,共4页
An organic light-emitting diode (OLED) device with high efficiency and brightness is fabricated by inserting CuOJCu dual inorganic buffer layers between indium-tin-oxide (ITO) and hole-transport layer (HTL). The... An organic light-emitting diode (OLED) device with high efficiency and brightness is fabricated by inserting CuOJCu dual inorganic buffer layers between indium-tin-oxide (ITO) and hole-transport layer (HTL). The CuOx/Cu buffer layer limits the operating current density obviously, while the brightness and efficiency are both enhanced greatly. The highest brightness of the optimized device is achieved to be 14 000 cd/m2 at current efficiency of 3 cd/A and bias voltage of 15 V, which is about 50% higher than that of the compared device without CuOJCu buffer layer. The highest efficiency is achieved to be 5.9 cd/A at 11.6 V with 3 400 cd/m^2, which is almost twice as high as that of the compared device. 展开更多
关键词 Buffer layers Efficiency Electronic equipment Light emitting diodes LUMINANCE Optical waveguides Tin oxides
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High-brightness blue organic light emitting diodes with different types of guest-host systems
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作者 王肖 张敬爽 +3 位作者 彭翠云 郭坤平 魏斌 张浩 《Optoelectronics Letters》 EI 2016年第2期89-92,共4页
We demonstrate high-brightness blue organic light emitting diodes(OLEDs) using two types of guest-host systems. A series of blue OLEDs were fabricated using three organic emitters of dibenz anthracene(perylene), di(4-... We demonstrate high-brightness blue organic light emitting diodes(OLEDs) using two types of guest-host systems. A series of blue OLEDs were fabricated using three organic emitters of dibenz anthracene(perylene), di(4-fluorophenyl) amino-di(styryl) biphenyl(DSB) and 4,4'-bis[2-(9-ethyl-3-carbazolyl)vinyl]biphenyl(BCzV Bi) doped into two hosting materials of 4,4'-bis(9-carbazolyl) biphenyl(CBP) and 2-(4-biphenylyl)-5(4-tert-butyl-phenyl)-1,3,4-oxadiazole(PBD) as blue emitting layers, respectively. We achieve three kinds of devices with colors of deep-blue, pure-blue and sky-blue with the Commission Internationale de L'Eclairage(CIE) coordinates of(0.16, 0.10),(0.15, 0.15) and(0.17, 0.24), respectively, by employing PBD as host material. In addition, we present a microcavity device using the PBD guest-host system and achieve high-purity blue devices with narrowed spectrum. 展开更多
关键词 guest biphenyl brightness coordinates colors normalized Internationale vinyl butyl biochemistry
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