基于全景相机的3D坐标测量方法

全景相机通过一次成像获取其周围3600场景,是一种大视场快速图像采集装置。研究了应用双鱼眼全景相机获取三维空间点的方法,研究了单鱼眼镜头成像模型,双鱼眼全景相机成像模型及图像变换原理。研究了鱼眼镜头成像畸变等校模型参数的标定方法,实现了对鱼眼畸变图像的矫正。提出了由全景图像数据解算任意方向等效鱼眼镜头成像数据的数学模型。最后应用平行光轴双目立体视觉技术,获得了被测场景的3D坐标数据。研究结果表明,应用这种方法在4 m×3 m×3 m的测量范围内精度可达13 mm。     

Legislation — Impact and Trends in Nutrition Labeling: A Global Overview

The need for accurate nutrition labeling on food products has never been greater. Obesity has assumed near-epidemic levels in both industrialized and emerging nations in recent years, and governments and consumer groups around the world are looking for ways to improve the nutritional choices for their citizenry while simultaneously balancing their freedom of choice through the use of nutrition labeling. Despite increasingly aggressive efforts by government and industry organizations to raise consumer awareness, though, many consumers either do not consult nutrition labels or they are not in a position to interpret the information on these labels accurately. To gain some fresh insights into nutrition labeling practices worldwide, this paper provides a review of the relevant peer-reviewed, scholarly, and government literature to describe regulations enacted to date, evolving and future trends, and the likely impact of food product labels. In this regard, the paper highlights similarities and discrepancies that exist, identifies gaps, and gives directions for the future.     

基于鱼眼视频图像的人群人数估计算法的研究

对于一些公共场所,人数的统计是安全领域的重要问题。为了获得大视角的监控视频,以得到更多有用的视频信息,同时兼顾实时性和监控成本,本文使用鱼眼镜头对人群进行监控。为了使所有视场范围内景物能够在有限大小的成像面上成像,设计者人为的引入桶形畸变,而且由于实际场景中的景物通过鱼眼镜头后,会产生权重不等的像素点,本文针对鱼眼图像透视加权模型,采用加权特征提取的方法,提取鱼眼图像中人群目标的特征,包括加权面积、加权周长、加权KLT角点数以及加权边缘点数这4个特征,并使用多元线性回归法估计出了人群中的人数,取得了良好的效果。     

四川名菜谱的营养评估

以四川名菜谱中50例菜肴为对象,通过微机编程计算出每一例菜肴中的营养素含量.拟定成年男性轻体力劳动者为评估标准,其每天所食副食均由菜肴供给,将上述得出的营养数据与中国营养学会推荐的每日膳食中营养标准供给量作比较,并就比较的结果对菜谱的合理性进行恰当的评估.     

An illusion effect of Maxwell’s fish-eye lens

We show that Maxwell＇s fish-eye lens can make a semi-circular perfect electric conductor look like a circular one. Such an effect can also be achieved （not perfectly） by using negative index metamaterials, but only within a single frequency. Maxwell＇s fish-eye lens, however, can work for a set of eigenfrequencies. Numerical simulations are performed to verify the effect.     

深入研究CSS下拉菜单

随着Web技术的发展,网页结构向着更加标准化的方向发展已经成为趋势。同时随着现代主流浏览器对CSS标准更加全面地支持,CSS在网页设计中表现层的位置终于得到重视,其强大的功能也正在得到不断深入的发掘和应用。一个典型的例子就是以前使用JavaScript等技术实现的下拉菜单,现在用CSS就可以轻松地实现了,并可以兼容当前所有主流的浏览器。     

Factors influencing behavioural intention to patronise restaurants using iPad as a menu card

Recently, several restaurants have launched mobile technology-based self-services by replacing their printed menus with iPads. To assess the perceived value of the iPad menu from the customers’ perspective, this study proposed and tested a new research model which includes both functional and emotional aspects of customers’ attitudes. The aim was based on the supposition that an overall value judgement in regard to using the iPad menu to promote dining experience will influence customers’ behavioural intention to patronise restaurants that use the new technology; 332 usable data gathered from cyberspace were tested against the research model. The results demonstrated the importance of perceived value. All functional factors (i.e. perceived control, perceived usefulness and perceived ease of use) and emotional factors (i.e. perceived enjoyment and perceived novelty) were significantly affecting perceived value. For managers interested in investing in these mobile self-service technologies, the findings provided them with sound advice based on empirical research.     

基于DELPHI的动态菜单的设计与应用

为了提高软件的灵活性,给出了动态菜单的分析设计思想及使用DELPHI实现动态菜单的关键技术。使用该设计方法,可以根据不同的用户在系统运行期间进行访问权限的动态调整,同时动态地对系统菜单进行设置和管理。     

毕业设计（论文）评审系统的设计与实现

毕业设计（论文）评审系统是高校教学改革和管理手段更新的必然选择．基于业务流程、功能需求和系统结构的分析完成了系统的结构和数据库设计,并对程序接口、动态菜单和动态表格等关键技术进行了论述．最后在系统中予以实现．