双通道局部处理的自适应图像增强方法

为了在无需人工干预的情况下自适应地处理多种不同特征的降质图像,有效恢复图中的细节信息,提出一种双通道局部处理的图像增强方法.首先在HSV色彩空间内分别在亮、暗双通道对亮度分量进行局部分析,计算出与之相适应的增强函数,对图像进行增强;然后对双通道的增强结果进行混合高斯加权合并,得到增强后的亮度分量;最后分析增强前后亮度分布的差异,计算色彩补偿函数,矫正增强过程中引入的色彩失真.此外,还提出一种快速滑窗技术,以有效地降低运算的时间复杂度.实验结果表明,该方法能够灵活地处理如曝光不足、曝光过度、逆光以及雾霾影响等不同种类的图像,甚至是综合了以上多种特性的复杂图像,在处理效果和自适应能力上优势明显.     

量子遗传算法在灰度图像中的应用

传统图像自适应增强算法存在着适应性较差,计算量大,人工干预变换参数不足等问题。Tubbs将图像增强处理中常用的非线性变换函数表示成一个归一化非完全Beta函数B(α,β),但确定Beta参数至今仍是一个复杂问题。本文主要介绍利用量子遗传算法对非线性变换参数α和β的自适应取值,实现灰度图像自适应增强,通过仿真实验验证了遗传算法增强图像的有效性。     

基于自适应分块的动态场景HDR图像合成算法

通过提出基于梯度上升优化处理的自适应分块算法与基于图像序列梯度域运动检测与去除相结合的方法,自适应调整分块大小及动态区域块的融合权值,最终达到混淆去除的目的.同时,利用Gaussian中心函数窗口滤波,去除在分块融合过程中引入的块边缘不连续性痕迹.实验结果表明,该方法能快速有效地增强多曝光图像融合生成HDRI并去除混淆问题.     

基于图像纹理清晰度的数字水印算法

为了提高嵌入水印图像的视觉效果和解决自适应调节参数简单的问题,借鉴了离散小波变换下纹理特征清晰度分析评价标准的思想,对文献[1]提出的分块自适应水印算法做出了改进,并提出了一种改进的水印算法.对图像离散小波变换的近似子带进行分块和纹理特征计算处理,对纹理特征计算值进行分类和确定对应分类的嵌入强度,将水印信息嵌入到近似子带分块SVD(奇异值分解)的S矩阵中.实验结果表明,通过纹理清晰度分析出来的自适应效果好于文献[1]中提到的方法,PSNR=70,NC=0.9926,而且水印信息具有良好的鲁棒性和不可见性.     

基于曲波变换的图像非线性增强改进算法

在传统曲波图像增强中,非线性增益函数通常需要调节多个参数。针对该问题,提出一种基于曲波变换的图像非线性增强改进算法。在处理低对比度图像前,对其空间域特征进行分析处理,将空间域非线性增强和曲波非线性增强处理相结合,通过较少的参数选择,结合曲波变换的多尺度特性,提高曲波增强方法的自适应度。实验结果证明,该算法具有较好的图像增强效果。     

基于物联网技术的小波域分块压缩感知算法的图像重构系统设计

针对低照明度重构图像分辨率不高、重构时间长的问题,提出了基于小波域分块压缩感知算法的图像重构系统。建立低照明度图像采样模型,采用图像的景深自适应调节方法进行小波域分块压缩感知和信息融合处理。利用多尺度的Retinex算法进行小波域分块压缩感知和信息提取,提取图像的信息熵特征量。采取图像自适应增强方法进行低照度图像增强处理,使用物联网技术进行低照明度图像的三维信息重构,结合细节增强方法进行低照度图像增强处理,完成重构系统设计,实现透射率图的轮廓检测和特征重构。仿真结果表明,采用该方法进行低照明度图像重构的分辨率较高,边缘感知能力较好,且重构耗时较短,实际应用效率较高。     

一种流体艺术风格的自适应LIC绘制方法

把LIC算法应用到非真实感绘制中,提出一种自适应流体艺术图的LIC绘制方法.对源图像亮度分量计算切矢量场,然后对其进行增强、平滑处理获得结构矢量场;通过随机扰动源图像获得纹理参考图像;根据结构矢量场和纹理参考图像的局部特征产生可变的LIC积分步长和步数,自适应地处理纹理参考图像;最后对绘制效果进行颜色渲染,生成具有丰富颜色特征的流体艺术图.实验表明,该方法能够较好地模拟诸如梵高画的流体艺术风格,呈现生动、灵活的波动感.     

AR场景中的基础态势数据展示与优化

随着增强现实（AR）设备的发展，增强态势已经成为其主要应用点。由于AR设备计算能力和图像处理能力的不足，存在场景生成速度慢和视野狭窄等问题。基于AR设备上的态势信息显示应用和设备地理信息场景显示功能的实现，本文对地形分块化算法进行优化，并提出一种自适应Mesh区域化算法来解决上述问题。对所提出的算法、传统地形生成算法和地形分块化算法进行测试，通过对比和分析，结果表明，所提算法比传统地形生成算法在显示效果和精细度方面更优，比地形分块化算法系统开销更小。因此，本文提出的自适应Mesh区域化算法可以用较小的硬件开销保证增强态势显示应用中地理信息场景显示功能的效果。     

一种快速的自适应图像增强算法①

提出了一种快速的自适应图像增强算法。算法首先对原始图像进行高斯平滑滤波,然后根据原始图像的整体信息和局部信息对图像的像素值进行偏移。最后,利用偏移后的图像信息和非线性函数对图像进行变换,从而实现了对图像细节的增强。通过将RGB图像变换到HSV彩色空间,将增强算法推广到了彩色图像的处理。实验结果表明,该算法运行速度快,能有效改善图像质量。同时能够根据环境的亮暗,自动调整增强效果,具有自适应的功能。     

基于投影降质图像的对比度调整算法研究

获取图像的过程中,经常会遇到由于事物的投影而影响图像的拍摄效果,导致图像不清晰,图像边缘模糊,无法观察部分事物的细节。通过对比度调整,可以增强图像效果。笔者将需要处理的图像经过USM锐化,增强图像的边缘细节信息,利用限制对比度自适应直方图均衡算法完成提高降质图像的清晰度,并通过实验比较了几种算法的效果。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate