一种基于多模式融合的多视点图像颜色校正方法

针对各种多视点成像系统中视点图像颜色不一致的问题,提出了一种基于多模式融合的多视点图像颜色校正方法.该方法通过定义四种通用的线性和非线性校正模式,首先对输入的源图像和参考图像进行视差估计,以视差估计得到的匹配块作为样本,然后对样本分别用四种校正模式进行训练,得到各种模式的校正参数,最后基于最小均方误差准则对各种校正模式进行融合,得到最终的校正图像.实验结果表明,该方法能实现参考图像与校正图像的最小均方根误差,且具有较好的校正效果.     

基于视点纠正的鱼眼图像场景化漫游方法

针对鱼眼图像畸变大、表示的场景信息不直观等特点,本文提出了一种基于视点纠正的鱼眼图像场景化漫游方法。该方法以鱼眼图像所表示的半球空间为观察对象,通过视点的转移在半球空间进行漫游,以对不同区域内的场景信息进行直观的观察。采用鱼眼图像校正算法为基础建立鱼眼镜头的球面映射模型,通过映射关系对以视点为中心的观察区域进行实时校正,当视点变化时对校正后的可视区域进行实时显示从而实现漫游。实验结果表明,通过本文算法能够实现鱼眼图像所表示半球空间的实时漫游,且漫游时显示的校正图像满足直线约束标准。     

多路CCD成像不均匀性校正算法

在多路CCD成像中,每路图像之间存在不均匀性,造成这种不均匀性的因素十分复杂,常规算法常无法将所有因素都考虑,影响了校正效果.根据图像的非均匀性特征,论文提出了一种基于场景的,采用两点校正理论,利用每路图像之间的线性关系来进行校正的方法,与传统两点校正算法和多点校正算法校正结果进行对比,给出了对比实验的校正结果.这种算法不需要标准辐射图像就可对多路CCD图像进行实时校正.为多CCD成像系统校正提供了一种有效的方法.     

基于FFST和Hessenberg分解的立体图像零水印算法

目的 为提高立体图像零水印方案抗几何攻击性能,提出一种基于快速有限剪切波变换（FFST）和Hessenberg分解的立体图像零水印算法。方法 首先分别对原始立体图像在YCbCr颜色空间下的左右视点亮度分量进行FFST,然后在得到的2个低频子带中,基于随机子块选择策略和Hessenberg联合分解来构造鲁棒特征矩阵,最后与预处理后的二值水印执行异或运算生成认证零水印。此外,零水印检测前先采用傅里叶-梅林变换方法对待认证的立体图像进行几何校正。结果 与相关算法相比,文中算法对常见非几何和几何攻击提取水印的平均NC值为0.984 1,表现出更优的抗攻击性能。结论 所提算法具有无损性和较强的安全性,可为立体图像版权保护提供可行的解决方案。     

基于区域主色特征的目标匹配算法

图像彩色特征被广泛应用于内容检索系统(CBIR)与目标识别系统中,如何描述获取区域图像彩色特征是应用颜色特征的基础.论文基于HSV色彩空间中色调量化直方图定义了目标区域主色特征,并综合目标区域主色均值距离与主色直方图相似性给出了区域颜色之间距离表达.同时利用算法对显微镜染色细胞图像中的细胞颜色进行了有效区分,得到了好的匹配结果.     

基于Leonard规正变量的修正高分辨率组合格式

通过对规正变量进行重构,本文提出了求解对流扩散方程的修正高分辨率组合格式,它能够求解边界层和大梯度等问题.首先,根据规正变量的定义得出了组合格式的通用表达式,然后对时间项采用二阶中心差分格式,得到了对流扩散方程的离散表达式,对离散化得到的代数方程组采用TDMA算法求解,并推导出了组合格式计算过程迭代收敛时所满足的充分条件.数值实验表明:新格式具有分辨率高,数值耗散较低,总偏差量较小,能很好模拟场变量的大梯度变化,计算结果优于传统格式.     

融合HSV与方向梯度特征的多尺度图像检索

针对现有彩色图像检索算法存在旋转变化鲁棒性差、特征维度高和检索时间长的问题,通过融合主曲率的改进方向梯度特征与HSV颜色特征,提出了一种创新的多尺度图像检索方法.该方法从多个尺度将图像表面的几何曲率信息融合到FHOG描述符中,得到基于主曲率的改进方向梯度算法(P-FHOG),在此基础上进一步融合图像的颜色信息,得到基于颜色特征与改进方向梯度特征的多尺度图像检索方法(CP-FHOG).在Corel-1000与Coil-100数据集上与先进的图像检索方法进行对比实验,分别取得了85.89％和93.38％的平均准确率,该算法相比其他算法准确率更高、旋转变化鲁棒性更强、检索时间更短,提高了检索效率.     

基于FCM和图割的交互式图像分割方法

为了提高在前景和背景颜色相似情况下图像的分割效果,提出了一种基于模糊C均值聚类(FCM)和图割的交互式图像分割方法。首先,利用分水岭算法对图像进行预处理,将图像分成多个小区域,用区域代替像素点进行分析。然后,采用模糊C均值算法对用户标记的前景区域和背景区域分别进行聚类分析,挖掘用户交互所提供的隐藏信息。用未标记区域的颜色分量到前景区域及背景区域类心的最小距离表示相似能量,用未标记区域与其相邻区域的相关性表示先验能量。最后,利用最大流/最小割算法求能量函数的全局最优解。与其他方法相比,该文方法具有较好的分割性能,能从前景背景相似的图像中较精确地提取感兴趣的物体,且用户操作简单。     

拼墙系统的颜色校正和多层图像处理系统设计

介绍一种基于DLP(数字光处理)显示技术拼接墙系统的颜色校正方法和可灵活配置的多层实时图像处理系统的设计,首先对每个DLP显示单元进行三基色校正,再对超高分辨率的拼接墙显示系统图像进行生成、分割、叠加等信号处理.颜色校正和多层图像处理系统与拼接墙每个显示单元构成一个分布式的系统,能同时显示大量信号源,且信号源的类型和数量可以灵活配置.所有信号均能实时高质量的在全拼接墙范围以任意大小、任意位置、任意顺序进行多个窗口的叠加显示.作为一种新型的多层图像处理系统,既增加了应用的灵活性,又可以减少资源浪费,降低成本.     

基于 YCbCr 颜色空间的快递单手写文字分割

目的在YCbCr颜色空间下,利用Cb颜色分量信息结合阈值分割方法,提取快递单图像手写体文字信息。方法首先将图像从RGB颜色空间转换到YCbCr颜色空间下,然后在Cb颜色分量图像下进行图像阈值分割处理操作,最后对提取出的手写体文字信息进行中值滤波去噪处理,并将该算法提取的结果与基于YCbCr颜色空间使用K均值聚类方法提取的结果在分割效果、分割时间与文字识别率上进行对比。结果利用Cb颜色分量提取出的手写体文字信息更清晰,具有更快的处理速度和更高的识别率,快递单图像平均处理时间为1.36 s,识别率为89%。结论单独利用Cb颜色分量信息提取手写文字就可得到较好的提取效果,算法简单、可行。     

From Industry 4.0 to Research 4.0. Development of High Performance Fibers in the Light of Digitization

We associate a variety of innovations with the term ＂Industry 4.0＂. The pioneer of many 4.0 modifications forms the basisfor the trend towards the integrated di...     

Roman iron and steel: A review

ABSTRACT

The production of ferrous metal increased during the Roman Late Republican period, Principate and Empire. The direct bloomery process was used to extract the metal from its ores using slag-tapping and slag-pit furnaces. The fuel was charcoal and an air blast was introduced by bellows-operated tuyères. Iron formed as a bloom, often as a spongy mass of metal, which contained impurities from the smelting process, including unreacted ore, fuel, slag and fragments from the furnace walls, while the metal was often inhomogeneous with varied carbon contents. Blooms were either smithed directly into bars or ingots or they were broken up, which also allowed the removal of gross impurities and a selection of pieces with similar properties to be made. These could then be forge-welded together and formed into characteristically shaped ingots. Making steel in the furnace seems to have been achieved: it depended on the ore and the furnace and conditions within it. Surface carburization was also carried out. Iron and steel were used extensively in construction and for tools and weapons. Fire welding was often used to add pieces of steel to make the edges of tools and weapons, which could be heat-treated by quenching to harden them.     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Synthesis of Alumina-Zirconia Nanocomposites by Solgel Process

Al₂O₃-ZrO₂ nanocomposites were developed starting with the solgel process. Composite alumina-zirconia nanopowders were synthesized from metallorganic precursors (Aluminium secondary butoxide and zirconium Iso propoxide) using the solgel process. The parameters affecting the synthesis—solvent, concentration of precursor, R/H ratio (i.e., dilution of water in solvent)—were varied as also the temperature and pH. BET and TEM were used to measure nanosize. Diffuse reflectance spectroscopy and also qualitative optical absorption led to identical particle size estimate. The variation of process parameters was used to study the effect and interdependence of process parameters. Artificial Neural Networks was used to rigorously analyze the process. Although this led to confirmation of interdependence of parameters, the presence of a single overwhelming solvent variable was also established. Then the optimal process was used to synthesize more nanopowder. To produce bulk nanocomposite the nanopowders were sintered by varying the temperature and time period. The sintered lithoids were probed with a vickers hardness tester to measure elastic modulus, hardness, and fracture toughness. The results showed high elastic modulus, modest hardness, and very high fracture toughness.     

Friction Stir Processing Strategies for Uniform Distribution of Reinforcement in a Surface Composite

Friction stir processing (FSP) is an important technique for preparing surface composites. Fabricating defect-free surface composites with uniform particle distribution by FSP is a challenging task. In this study, silicon carbide particles reinforced AA5083 alloy surface composites was fabricated using different FSP strategies including variation in process parameters, dual-tool processing and tool offset overlapping. Material flow of the processed material with reinforcement particles demonstrated that the distribution of particles was influenced by the stirring action of the probe as well as the extrusion of the plasticized material due to the movement of the tool. Process parameters, particularly rotational speed, showed a dominant influence on the distribution of silicon carbide particles.     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.     

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