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rgb WGM lasing woven in fiber braiding cavity

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Science China(Information Sciences) 2022年第8期65卷 247-253页

作者： Kun GE Zhiyang XU Dan GUO Ben NIU Jun RUAN Libin CUI Tianrui ZHAI College of Physics and Optoelectronics Faculty of ScienceBeijing University of Technology

It is critical to realize woven and wearable red-green-blue(rgb) whispering gallery mode(WGM)lasing that is tunable and flexible in the fiber braiding cavity. However, it is still a challenge to achieve tunable full-color lasing with the large color gamut by a facile approach. Here, we design the braiding cavity to realize rgb WGM lasing with high performance. The braiding cavity consists of three optical fibers coated with dye-doped polymer. Each fiber therein serves as a resonant cavity to support multiple lasing modes. There is no interference owing to the air gap between them; therefore, we can achieve full-color WGM lasing. The lasing emission in our fiber braiding cavity covers a color gamut of 86.7% larger than standard rgb *** work may provide a platform for potential applications in white laser and integrated optoelectronic devices.

关键词： rgb whispering gallery mode (WGM) lasing fiber braidingcavity full-color gamut

Converting TREx-rgb green-channel data to 557.7 nm auroral intensity:Methodology and initial results

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Earth and Planetary Physics 2024年第1期8卷 258-274页

作者： Jun Liang D.M.Gillies E.Spanswick E.F.Donovan University of Calgary CalgaryT2N 1N4Canada

The recently deployed Transition Region Explorer(TREx)-rgb(red-green-blue)all-sky imager(ASI)is designed to capture“true color”images of the aurora and *** the 557.7 nm green line is usually the brightest emission line in visible auroras,the green channel of a TREx-rgb camera is usually dominated by the 557.7 nm *** this rationale,the TREx mission does not include a specific 557.7 nm imager and is designed to use the rgb green-channel data as a proxy for the 557.7 nm *** this study,we present an initial effort to establish the conversion ratio or formula linking the rgb green-channel data to the absolute intensity of 557.7 nm auroras,which is crucial for quantitative uses of the rgb *** illustrate two approaches:(1)through a comparison with the collocated measurement of green-line auroras from the TREx spectrograph,and(2)through a comparison with the modeled green-line intensity according to realistic electron precipitation flux measurements from low-Earth-orbit satellites,with the aid of an auroral transport *** demonstrate the procedures and provide initial results for the TREx-rgb ASIs at the Rabbit Lake and Lucky Lake *** rgb response is found to be *** conversion ratios or formulas between rgb green-channel data and the green-line auroral intensity are given and can be applied immediately by TREx-rgb data *** methodology established in this study will also be applicable to the upcoming SMILE ASI mission,which will adopt a similar rgb camera system in its deployment.

关键词： TREx rgb green-line aurora auroral transport model

Modeling Dynamics of Leaf Color Based on rgb Value in Rice

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Journal of Integrative Agriculture 2014年第4期13卷 749-759页

作者： ZHANG Yong-hui TANG Liang LIU Xiao-jun LIU Lei-lei CAO Wei-xing ZHU Yan National Engineering and Technology Center for Information Agriculture Ministry of Industry and Information Technology/Jiangsu Key Laboratory for Information Agriculture/College of AgricultureNanjing Agricultural University

This paper was to develop a model for simulating the leaf color changes in rice （Oryza sativa L.） based on rgb （red, green, and blue） values. Based on rice experiment data with different cultivars and nitrogen （N） rates, the time-course rgb values of each leaf on main stem were collected during the growth period in rice, and a model for simulating the dynamics of leaf color in rice was then developed using quantitative modeling technology. The results showed that the rgb values of leaf color gradually decreased from the initial values （light green） to the steady values （green） during the first stage, remained the steady values （green） during the second stage, then gradually increased to the final values （from green to yellow） during the third stage. The decreasing linear functions, constant functions and increasing linear functions were used to simulate the changes in rgb values of leaf color at the first, second and third stages with growing degree days （GDD）, respectively; two cultivar parameters, Matrgb （leaf color matrix） and AR （a vector composed of the ratio of the cumulative GDD of each stage during color change process of leaf n to that during leaf n drawn under adequate N status）, were introduced to quantify the genetic characters in rgb values of leaf color and in durations of different stages during leaf color change, respectively; FN （N impact factor） was used to quantify the effects of N levels on rgb values of leaf color and on durations of different stages during leaf color change; linear functions were applied to simulate the changes in leaf color along the leaf midvein direction during leaf development process. Validation of the models with the independent experiment dataset exhibited that the root mean square errors （RMSE） between the observed and simulated rgb values were among 8 to 13, the relative RMSE （RRMSE） were among 8 to 10%, the mean absolute differences （da） were among 3.85 to 6.90, and the ratio of da to the mean observation values （Clap

关键词： rice leaf color rgb dynamic simulation visualization

An effective graph and depth layer based rgb-D image foreground object extraction method

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Computational Visual Media 2017年第4期3卷 387-393页

作者： Zhiguang Xiao Hui Chen Changhe Tu Reinhard Klette School of Information Science and Engineering Shandong UniversityJinan 250100China School of Computer Science and Technology Shandong UniversityJinan 250100China School of Engineering Computer and Mathematical SciencesAuckland University of TechnologyAuckland 1142New Zealand

We consider the extraction of accurate silhouettes of foreground objects in combined color image and depth map *** is of relevance for applications such as altering the contents of a scene,or changing the depths of co... 详细信息

关键词： rgb An effective graph and depth layer based rgb-D image foreground object extraction method

rgb三波段消光法测量细微颗粒粒度分布研究

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光学学报 2015年第7期35卷 188-195页

作者：黎石竹蔡小舒高伟刘浩上海理工大学颗粒与两相流测量研究所上海200093

提出了采用彩色相机rgb信号实现三波段消光法测量微米级颗粒粒度分布的方法。当一束平行白光入射到弥散细微颗粒时,测量不同波长的透射光强信号,用多波长消光法理论反演可以测得被测弥散细微颗粒粒度。当用彩色相机拍摄透射光,得到的图... 详细信息

提出了采用彩色相机rgb信号实现三波段消光法测量微米级颗粒粒度分布的方法。当一束平行白光入射到弥散细微颗粒时,测量不同波长的透射光强信号,用多波长消光法理论反演可以测得被测弥散细微颗粒粒度。当用彩色相机拍摄透射光,得到的图像实际是rgb三个波段的透射光信号,该信号与相机的rgb响应曲线、光源光谱特性、被测颗粒粒径及颗粒浓度有关。对rgb三波段信号用消光法理论进行分析和反演计算,可以得到细微颗粒的粒度分布。通过数值模拟与实验验证,表明用彩色相机rgb三波段消光法可以测量亚微米到3 mm大小的颗粒粒度分布。将该方法与图像法颗粒粒度测量相结合,可以将彩色相机测量颗粒粒度的范围拓展到从亚微米到数百微米。

关键词：测量彩色相机三波段消光法 rgb 颗粒粒度

基于rgb Gamma曲线的LED显示图像的色散校正技术

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光电子．激光 2008年第1期19卷 125-127页

作者：朴燕王瑞光丁铁夫长春理工大学吉林长春130022 中科院长春光学精密机械与物理研究所吉林长春130033

通过对rgb三基色发光二极管(LED)温度特性的测试和分析发现,随着环境温度的变化,每种基色的LED亮度与常温时的亮度相比都会发生一定程度的偏移,且其偏移量不相同,导致了图像白场平衡的失真。为了校正失真,针对每个基色LED提出一种不同... 详细信息

通过对rgb三基色发光二极管(LED)温度特性的测试和分析发现,随着环境温度的变化,每种基色的LED亮度与常温时的亮度相比都会发生一定程度的偏移,且其偏移量不相同,导致了图像白场平衡的失真。为了校正失真,针对每个基色LED提出一种不同环境温度下的Gamma补偿曲线,使rgb三基色LED在环境温度变化时具有相同的亮度偏移值,以保证白场平衡。本文提出的Gamma补偿技术克服了LED的温度特性引起显示屏图像的色彩失真和白场平衡的破坏,使图像的色彩不会受环境温度的变化而失真。

关键词：全色发光二极管(LED)显示 Gamma曲线 rgb 校正补偿

Color representation method using rgb color binary-weighted computer-generated holograms

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Chinese Optics Letters 2018年第8期16卷 25-29页

作者： Masato Fujiwara Naoki Takada Hiromitsu Araki Shohei Ikawaa Yuki Maeda Hiroaki Niwase Minoru Oikawa Takashi Kakue Tomoyoshi Shimobaba Tomoyoshi Ito Graduate School of h~teg＇rated Arts and Sciences Kochi University Kochi 780-8520 Japan 2Science Department Natural Sciences Cluster Research and Education Faculty Kochi University Kochi 780-8520 Japa Faculty of Science Kochi University Kochi 780-8520 .lapan IGraduate School of Engineering Chiba University Chiba 263-8522 Japan

We propose a method for color electroholography using a simple red-green-blue （rgb） gradation representa- tion method without controlling the respective brightness of tile reference rgb-colored lights. The proposed method uses rgb multiple bit planes comprising rgb binary-weighted computer-generated holograms with various light transmittanees. The object points of a given three-dimensional （3D） object are assigned to rgb nmltiple bit planes according to their rgb gradation levels. The rgb multiple bit planes are sequentially displayed in a tim-division-multiplexe- manner. Consequently, the proposed method yields a color gradation representation of a reconstructed 3D object.

关键词： rgb Color representation method using rgb color binary-weighted computer-generated holograms CGH

基于rgb降维模型和小波的彩色图像边缘检测

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浙江大学学报（工学版） 2004年第7期38卷 856-859,892页

作者：任俊李志能傅一平浙江大学信息与电子工程学系浙江杭州310027

针对彩色图像边缘检测计算量大的弱点,对彩色图像空间(rgb)进行三基色降维处理,保持图像的各个基色的灰度矩不变,以最大限度地保留原图像的主要特征.用三次B-样条函数作为光滑函数来定义小波函数,通过小波变换对降维后的图像进行边缘检... 详细信息

针对彩色图像边缘检测计算量大的弱点,对彩色图像空间(rgb)进行三基色降维处理,保持图像的各个基色的灰度矩不变,以最大限度地保留原图像的主要特征.用三次B-样条函数作为光滑函数来定义小波函数,通过小波变换对降维后的图像进行边缘检测.实验结果表明,该方法既可以突出细节边缘,也能够保持图像的主要信息,而且比其他彩色图像边缘检测方法平均减少了40%的计算时间.

关键词： rgb 降维模型小波变换边缘检测

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基于rgb渲染技术的地震多属性分析技术

煤炭学报 2009年第11期34卷 1512-1516页

作者：李艳芳程建远朱书阶王成煤炭科学研究总院西安研究院陕西西安710054

讨论了rgb联合渲染技术的原理,提出采用聚类分析与主成分分析相结合的方法,从众多的地震属性中优选出3类属性进行rgb联合渲染,并从人眼视觉结构角度对6个rgb合成地震属性图像质量给出了定量评价方法.实际资料对比表明:rgb联合渲染技术... 详细信息

讨论了rgb联合渲染技术的原理,提出采用聚类分析与主成分分析相结合的方法,从众多的地震属性中优选出3类属性进行rgb联合渲染,并从人眼视觉结构角度对6个rgb合成地震属性图像质量给出了定量评价方法.实际资料对比表明:rgb联合渲染技术获得的地震属性图像层次清晰,细节丰富,提高了从地震资料中快速提取地质体异常信息的能力.

关键词： rgb 渲染技术地震多属性图像质量