基于不变矩相似度的快速图像拼接

针对图像拼接中普遍存在的效率低和误匹配等问题,提出了一种基于不变矩相似度的快速拼接方法。首先利用不变矩相似度准则,预估输入图像的重叠区域,然后采用SIFT算法进行特征点检测和匹配,减少了不必要的特征提取和误匹配。利用稳健的RANSAC算法实现特征点提纯并计算单应性矩阵。最后,针对带运动目标的动态场景融合后易出现鬼影的现象,提出一种改进的分段线性加权融合算法以消除拼接鬼影。     

基于匹配策略融合的低误差快速图像拼接算法

针对目前多数拼接算法正确匹配率低、耗时及误差大的问题,提出了基于匹配策略融合的改进图像拼接算法。该算法首先仅在图像的重合区域提取SIFT特征点,并计算SURF特征描述符;其次,融合改进的最近邻比次近邻、双向交叉检查及匹配差值的阈值化3种匹配策略,结合坐标约束及RANSAC算法完成特征匹配;最后,提出利用配准参数计算任意图像到参考图像坐标空间的投影变换模型的方法,并利用多线程技术将所有图像投影至参考坐标系,经过亮度校正、加权融合后合成全景图。实验结果表明,提出的拼接算法正确匹配率提高了10~20%,拼接总耗时约为传统逐帧扩大式拼接算法的1/3,且累计误差大大降低,拼接图像畸变小。     

一种改进的RANSAC图像拼接算法

针对RANSAC算法迭代次数过多导致的图像拼接效率不高的问题,提出一种改进的RANSAC图像拼接算法;首先采用SIFT算法提取尺度不变特征点,利用双向互匹配策略对特征点进行匹配,在使用RANSAC算法计算单应性矩阵之前,利用相邻特征点之间的关系对初始特征点对进行筛选,最后使用加权平滑法完成图像的融合;实验结果表明该方法有效地减少了特征点对数,提高了RANSAC的运行时间,图像拼接效率有了很大的提高。     

一种改进的快速图像拼接方法

为了提高图像拼接的速度,提出了一种快速的图像拼接方法.首先在SUSAN角点检测算法检测出图像角点的基础上,采用图像分块和邻近角点剔除的方法来保证图像角点分布均匀并且避免出现角点聚簇现象,利于提高拼接的精度.其次,利用灰度相关性进行特征角点的匹配并消除伪匹配.然后采用改进的RANSAC算法快速地估计变换矩阵,该算法中采用预检测的方法快速抛弃那些不是候选模型的临时模型,加快了算法的速度.最后进行颜色融合,生成无缝拼接图像.实验结果表明,该方法在得到较高精度的情况下,大大减少了运算量,提高了图像拼接的速度.     

基于拉普拉斯金字塔融合的岩心图像拼接算法

针对岩心图像拼接效率低以及易出现鬼影现象的问题,提出了一种基于最佳缝合线的拉普拉斯金字塔融合的岩心图像拼接方法.首先将待拼接的两幅岩心图像进行灰度变换,根据ORB算法计算并描述特征点;其次使用改进的random sample consensus (RANSAC)算法对特征点进行提纯,完成特征点匹配;根据匹配的特征点计算图像间的配准关系,最后根据最佳缝合线实现岩心图像的拉普拉斯金字塔融合,完成拼接.实验结果表明,改进的RANSAC算法能在保证正确率的同时提升速度,而且本文提出的图像融合方法避免了鬼影的产生,在融合区域的PSNR、SSIM和DoEM客观评价指标上与另外两种图像融合算法相比都有所提升.     

基于ORB特征的无人机遥感图像拼接改进算法

针对传统的SIFT算法运行速度较慢、不适合处理实时性要求高的无人机遥感图像的缺点,提出了一种基于ORB特征的快速遥感图像拼接改进算法。首先通过ORB算法快速得到特征点和特征描述,采用K最近邻算法（KNN）进行粗匹配,然后采用随机抽样一致性算法（RANSAC）进行精匹配,最后使用改进的加权平均方法对图像进行融合拼接。实验结果表明,该算法在保证匹配精度的基础上,处理速度较经典的SIFT算法提高了41倍。在图像融合时,该算法能有效地消除拼接重影错位现象。     

一种消除图像拼接缝和鬼影的快速拼接算法

由于提取SIFT特征进行图像拼接的算法复杂度较高且不能很好地处理拼接缝和鬼影等问题,提出了一种消除拼接缝和鬼影的快速图像拼接算法.该算法首先划定提取SIFT特征的范围,计算出匹配特征点后使用RANSAC算法求取两幅图像间的坐标变换关系矩阵H,然后结合最佳缝合线算法和改进的加权平均融合算法实现无缝拼接.实验结果表明,提出的算法不仅有效地消除了拼接缝和鬼影,也提高了图像拼接的效率.     

基于特征点匹配的全景图像拼接技术研究

提出了一种基于特征点匹配的全景图像拼接算法,首先提取各图像中的SIFT特征,通过特征点匹配完成两幅图像的配准;再根据图像配准结果计算出图像间的变换矩阵;最后采用渐入渐出加权平均的融合方法对两幅图像进行无缝拼接。实验表明,该算法具有匹配精度高、鲁棒性强等特点,可以快速而自动地生成全景图像。     

基于运动平滑约束项的快速误匹配剔除算法

针对图像拼接时用随机抽样一致性（RANSAC）算法迭代计算过程中计算量大、匹配正确率低的问题,提出了一种基于运动平滑约束项的误匹配剔除算法。首先采用快速旋转不变特征（ORB）算法提取特征点,基于汉明距离实现特征点初匹配;其次,基于运动平滑约束项统计邻域支持估计量实现误匹配粗剔除;然后,进一步采用空间几何约束关系实现误匹配精剔除;最后,利用分组排序采样求解模型参数,采用加权平均实现图像融合。实验结果表明,该算法的误匹配剔除率相比缩小抽样点总量算法提升了75.6%,相比自适应阈值算法提升了24%,此方法能有效剔除误匹配,实现图像精确拼接。     

基于改进SIFT的图像拼接算法

针对基于SIFT算法的图像拼接中算法复杂度过大和特征点匹配不准的问题,提出了用CS-LBP算子结合SIFT特征点生成特征描述符以及特征双向匹配的图像拼接算法。首先提取SIFT关键点,对每个关键点生成81维的CS-LBP特征描述子,然后利用特征向量双向匹配策略寻找符合特征匹配关系的匹配点对完成粗匹配,最后再利用RANSAC算法计算待拼接图像之间的变换矩阵,从而实现图像的拼接。实验结果表明,该方法能够有效地减少运算量,加快运算速度,拼接效果也较为理想。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

基于AD9626的模拟信号采集存储卡设计

自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

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.     

A human-computer interface for non-computer specialists

The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users.