网络出口转换技术研究

随着网络利用的普及,企事业单位都多数建有自己的网络,为满足不同的需求,接入了多个网络出口。如何解决网络服务与网络接入的关系,提高网络服务系统接口带宽和访问速度,是多网接入用户需要解决的问题,文中结合作者的工作经验,以Web网站作为服务对象,对上述问题进行分析和研究,其成果对多网用户有较好的借鉴。     

基于灰度和边界方向直方图的医学图像检索

本文研究了采用分级检索的机制,综合利用灰度及形状特征进行基于内容的医学图像检索的方法,该方法克服了灰度直方图不能充分表示空间分布信息的不足。利用边界方向直方图描述形状特征,避开了对图像进行精确分割这一医学图像处理中的难点问题。对CT图像数据库进行的检索实验,验证了该方法具有良好的检索性能。     

电视图像的视觉传达设计研究

针对高清电视数字图像边缘对比度低、清晰显示难度大的问题,提出考虑视觉传达效果的二维灰度电视图像直方图边缘显示方法.首先对包含大量扰动信息和各类噪声的电视图像进行预处理,识别信号模式并进行特征提取;根据电视图像特征及灰度梯度在图像边缘的响应,获取直方图的统计特征并进行分块处理,形成二维灰度图像的直方图;搜寻出二维灰度图像直方图与电视数字图像边缘的内在关联性,实现对电视图像边缘的精确显示.实验结果证明,提出的电视图像边缘显示方法能够获得更好的视觉传达效果.     

基于灰色关联模型的作战效能影响因素分析

复杂电磁环境下,准确分析各种影响因素对电子装备作战效能的影响程度具有重要意义。针对统计方法不适用于数据样本少的的情况,利用灰色关联分析的方法,建立数据的灰色关联模型,结合实例对多种因素依据其与作战效能评估指标的关联程度进行排序,从中查找制约作战效能发挥的主要因素以指导装备实际的运用,分析结果与专家组评定基本符合。该方法在实践中已得到应用。     

图像处理技术用于批量产品数量自动统计

几何形状相同的批量产品数量自动统计是实现生产自动化的重要课题之一.分析工程背景的需求,将CCD摄像头拍摄的产品图像进行灰度变换和二值化后,可以得到数据压缩后的产品预处理图像.根据产品几何形状相同的特点,优化设计面积法统计目标像素并建立有效的算法模型,自动计算出批量产品的数量,实现实时计数.从而改善劳动环境、提高生产效率,进而拓展了数字图像处理技术在工业生产监测中的应用领域.     

基于Contourlet变换的图像消噪处理

文中提出了一种基于区域和Contourlet变换相结合的图像融合新方法,新方法利用小波Contourlet变换良好的多尺度性和多方向性特征,结合Contourlet变换的多聚焦图像融合算法,得到高频和低频图像。小波Contourlet由于变换缺乏平移不变性而产生图像失真,弱边缘具有几何信息,而噪声却不具备这个性质。为了在去噪声的同时更多地保留弱边缘信息,再次利用到循环平移的方法。实验结果表明,该文方法不仅在客观评价指标上优于小波变换法,而且从主观评价上来看,文中所提方法得到的图像更加清晰。     

基于灰色关联度的提升小波域图像融合算法

针对多聚焦图像,提出了一种基于提升静态小波变换(Lifting Stationary Wavelet Transform,LSWT)和灰色关联度相结合的图像融合算法.首先将待融合的两幅图像分别进行提升静态小波变换,低频分量采用平均法融合.其次针对低频分量和各个方向的高频分量,分别计算以每个像素为中心的方块的能量和均值.然后按照一定的融合规则,分别得到高频分量融合后的值.最后进行提升小波逆变换,得到融合后的图像.实验结果显示,该方法融合效果较好,优于传统算法.     

How useful are closed captions for learning mathematics via online video?

Closed captioning of instructional videos is a topic that has not seen much discussion despite its importance for hearing-impaired students and recent legal ramifications if videos are not appropriately captioned. In particular, it is unclear what best practice in captioning videos should be to benefit all learners in disciplines such as mathematics with a reliance on the development of visual explanation while providing audio narration. In this paper, we report on a study undertaken at an Australian university, to investigate the perceived level of usefulness of captions and their automatic translations in a mathematics course. We discovered that students broadly agreed that captions are a useful learning feature: to allow flexibility of where and when a video is watched, but also to help understand speaker accents, and clarify explanations that are difficult to hear in the recording. Due to the high levels of use and perceived educational benefits of closed captions in online video but limited literature, there is a significant need for new research in this area. An urgent discussion is needed to explore how students engage with closed captions, how they may support learning, and to investigate implications on instructional design of mathematical videos.     

Graph-based Lexicalized Reordering Models for Statistical Machine Translation

Lexicalized reordering models are very important components of phrasebased translation systems.By examining the reordering relationships between adjacent phrases,conventional methods learn these models from the word aligned bilingual corpus,while ignoring the effect of the number of adjacent bilingual phrases.In this paper,we propose a method to take the number of adjacent phrases into account for better estimation of reordering models.Instead of just checking whether there is one phrase adjacent to a given phrase,our method firstly uses a compact structure named reordering graph to represent all phrase segmentations of a parallel sentence,then the effect of the adjacent phrase number can be quantified in a forward-backward fashion,and finally incorporated into the estimation of reordering models.Experimental results on the NIST Chinese-English and WMT French-Spanish data sets show that our approach significantly outperforms the baseline method.     

Flexibility in the length of convolutions computed using Fourier-like fast transform algorithms

An efficient method of achieving flexibility in the length of discrete convolutions, computed using Fourier and Fourier-like fast transform algorithms, is described. Then this method is extended to discrete multidimensional convolutions computed using polynomial transforms.