Urban color planning will not only excavate historical context to strengthen urban difference and highlight urban individuality,thereby forming urban style and features that are easy to identify and perceive,but integ...Urban color planning will not only excavate historical context to strengthen urban difference and highlight urban individuality,thereby forming urban style and features that are easy to identify and perceive,but integrate natural landscape and control urban color,open space,green space system and architectural elements to crate a splendid visual space.Adhering to the concept of inheriting the historical context and culture,urban color planning of Xuzhou City fully taps the cultural potential of the historical and cultural resources,natural landscape resources and local customs and practices and carries out a practical exploration of urban color and urban style and features as well as the heritage and development of local culture through the urban color planning of"one centre,two axes,two belts,three sections",so as to provide a constructive reference for urban color planning of other cities in China.展开更多
实木地板具有自然生长的色彩和纹理,是室内装饰的优良材料,为了满足特定的室内装饰要求的艺术效果,实木地板的尺寸需要精确、颜色需要协调,因此在生产过程中需要对实木地板的几何尺寸进行测量并对颜色进行分类,以满足客户的个性化需求...实木地板具有自然生长的色彩和纹理,是室内装饰的优良材料,为了满足特定的室内装饰要求的艺术效果,实木地板的尺寸需要精确、颜色需要协调,因此在生产过程中需要对实木地板的几何尺寸进行测量并对颜色进行分类,以满足客户的个性化需求。然而,传统人工分选的方法受劳动强度、工作效率、检测客观度等因素的制约,难以满足日益增长的产业自动化与智能化发展需求。本文基于机器视觉技术,对实木地板的几何尺寸和颜色采集系统进行设计,对实木地板外观尺寸测量和色差识别算法进行优化。在几何轮廓尺寸测量中,更多地考虑生产过程中木地板随机姿态对测量精度的影响,通过ArUco(Augmented Reality University of Cordoba)码实时感知木地板的三维姿态并进行矫正,提高尺寸测量的精度;在色差识别中,通过梯度自相关算子对木纹进行识别和去除,并以Lab颜色空间表征色差。经实验验证,本文的方法可根据基准板对加工缺失、多余轮廓进行识别,尺寸检测相对精度约0.8%,木地板的色差得到较好地表征和识别。展开更多
车车通信列车运行控制系统中移动授权的生成对城市轨道交通运营效率有着较大的影响。通过分析车车通信列车运行控制系统中移动授权的生成过程及性能,建立基于有色Petri网(colored Petri net,CPN)的车车通信移动授权信息交互的模型,进行...车车通信列车运行控制系统中移动授权的生成对城市轨道交通运营效率有着较大的影响。通过分析车车通信列车运行控制系统中移动授权的生成过程及性能,建立基于有色Petri网(colored Petri net,CPN)的车车通信移动授权信息交互的模型,进行性能分析。研究移动授权生成过程中端对端通信传输时延的延时概率,根据不同信道质量下统计传输时延的平均值,计算移动授权完成的成功率。分析结果表明,基于车车通信的列车运行控制系统移动授权的生成过程,符合地铁长期演进(long term evolution for metro,LTE-M)系统端到端延时时间不大于150 ms的概率不小于98%,时延随着信道质量的下降而增加。展开更多
Structural colors have always attracted much attention due to important applications in display devices,imaging security certification,optical data storage,and so on.The brightness of structure colors,as the carrier o...Structural colors have always attracted much attention due to important applications in display devices,imaging security certification,optical data storage,and so on.The brightness of structure colors,as the carrier of chiaroscuro information,is the key to making images appear stronger in the spatial and three-dimensional sense.However,relatively little work has been done on the control of the color brightness,and the reported structures are complex and difficult to fabricate.Here,we demonstrate a low-aspect-ratio anisotropic metasurface consisting of a PMMA film patterned by arrays of elliptical-shaped holes clamped by two thin aluminum films.By utilizing localized surface plasmon resonances,we realize a three-dimensional(3D)HSB(hue,saturation,and brightness)structure color with independent brightness control and enhance the cross-polarization reflection,covering approximately 120%of the s RGB color gamut.It is shown that the ratio of the major and minor axes leads to the independent control of brightness of the structural colors.The nanoprinting of HSB images with smooth brightness transitions is demonstrated through elaborate design of the metasurface geometry parameters and CMOScompatible micro-nano fabrication process.Our findings will facilitate the broad range of 3D nanoprinting and modern advanced display applications.展开更多
文摘Urban color planning will not only excavate historical context to strengthen urban difference and highlight urban individuality,thereby forming urban style and features that are easy to identify and perceive,but integrate natural landscape and control urban color,open space,green space system and architectural elements to crate a splendid visual space.Adhering to the concept of inheriting the historical context and culture,urban color planning of Xuzhou City fully taps the cultural potential of the historical and cultural resources,natural landscape resources and local customs and practices and carries out a practical exploration of urban color and urban style and features as well as the heritage and development of local culture through the urban color planning of"one centre,two axes,two belts,three sections",so as to provide a constructive reference for urban color planning of other cities in China.
文摘实木地板具有自然生长的色彩和纹理,是室内装饰的优良材料,为了满足特定的室内装饰要求的艺术效果,实木地板的尺寸需要精确、颜色需要协调,因此在生产过程中需要对实木地板的几何尺寸进行测量并对颜色进行分类,以满足客户的个性化需求。然而,传统人工分选的方法受劳动强度、工作效率、检测客观度等因素的制约,难以满足日益增长的产业自动化与智能化发展需求。本文基于机器视觉技术,对实木地板的几何尺寸和颜色采集系统进行设计,对实木地板外观尺寸测量和色差识别算法进行优化。在几何轮廓尺寸测量中,更多地考虑生产过程中木地板随机姿态对测量精度的影响,通过ArUco(Augmented Reality University of Cordoba)码实时感知木地板的三维姿态并进行矫正,提高尺寸测量的精度;在色差识别中,通过梯度自相关算子对木纹进行识别和去除,并以Lab颜色空间表征色差。经实验验证,本文的方法可根据基准板对加工缺失、多余轮廓进行识别,尺寸检测相对精度约0.8%,木地板的色差得到较好地表征和识别。
文摘车车通信列车运行控制系统中移动授权的生成对城市轨道交通运营效率有着较大的影响。通过分析车车通信列车运行控制系统中移动授权的生成过程及性能,建立基于有色Petri网(colored Petri net,CPN)的车车通信移动授权信息交互的模型,进行性能分析。研究移动授权生成过程中端对端通信传输时延的延时概率,根据不同信道质量下统计传输时延的平均值,计算移动授权完成的成功率。分析结果表明,基于车车通信的列车运行控制系统移动授权的生成过程,符合地铁长期演进(long term evolution for metro,LTE-M)系统端到端延时时间不大于150 ms的概率不小于98%,时延随着信道质量的下降而增加。
基金National Key Research and Development Program of China(2024YFA1209104)National Natural Science Foundation of China(12374282,61875225)。
文摘Structural colors have always attracted much attention due to important applications in display devices,imaging security certification,optical data storage,and so on.The brightness of structure colors,as the carrier of chiaroscuro information,is the key to making images appear stronger in the spatial and three-dimensional sense.However,relatively little work has been done on the control of the color brightness,and the reported structures are complex and difficult to fabricate.Here,we demonstrate a low-aspect-ratio anisotropic metasurface consisting of a PMMA film patterned by arrays of elliptical-shaped holes clamped by two thin aluminum films.By utilizing localized surface plasmon resonances,we realize a three-dimensional(3D)HSB(hue,saturation,and brightness)structure color with independent brightness control and enhance the cross-polarization reflection,covering approximately 120%of the s RGB color gamut.It is shown that the ratio of the major and minor axes leads to the independent control of brightness of the structural colors.The nanoprinting of HSB images with smooth brightness transitions is demonstrated through elaborate design of the metasurface geometry parameters and CMOScompatible micro-nano fabrication process.Our findings will facilitate the broad range of 3D nanoprinting and modern advanced display applications.
