基于嵌入式图像终端的农作物虫害监测系统设计

为实现对农作物虫害的实时预警并辅助疾病诊断,实现无人值守的病虫害智能监控,设计一种嵌入式设备与工控机相结合的农作物虫害监测系统。通过下位机ARM-Linux嵌入式图像终端采集农作物叶片图像,利用TCP/IP网络发送数据;上位机监测系统利用虚拟仪器接收并解析图像,完成图像格式转换、虫害诊断与实时显示。针对传统基于Web技术的图像监控系统只能通过浏览器或专用客户端软件浏览图像,而不能处理数据的缺点,设计网络ppm格式图像数据至LabVIEW图像数据的转换函数,实现农作物叶片图像的自动采集、显示与图像处理功能。测试结果表明,该系统工作稳定,在农业病虫害的图像采集与诊断防治方面具有重要的应用价值。     

基于ARM11的H.264实时监控系统

基于视频监控应用领域应用广泛,对视频监控的实时性已成为检验安防系统的重要标准,为此设计以TE6410开发板为硬件平台为核心基于Linux系统实现H. 264软件编码的实时监控系统。平台采用cmos摄像头基于V4L2接口采集视频,采用X264软件编码压缩,实现了视频的高度压缩比;基于RTP协议打包封装H. 264视频流经网络传输到VLC播放器,显示监控画面。经实验测试结果证明,系统监控图像清晰,播放流畅达到了实时监控的效果。     

基于无线网络的血液冷藏温度监控系统的设计

针对血液温度监控的特殊情况,利用Delphi,采用Windows API函数配合多线程技术对血站冰箱温度实时监控,通过通讯接口在上位机端完成现场数据实时采集与动态图形显示,同时将采集到的数据存储在SQL Server数据库中,实现血站冰箱温度网络化系统管理,可解决血站对冷藏设备温度手工控制的问题。     

基于USB接口与LabVIEW的数据采集系统设计

设计了基于USB接口与LabVIEW的数据采集系统.单片机将采集到的信号通过USB接口与串口间的桥接控制器——PL2303传输到PC机,通过LabVIEW进行分析处理.整个系统分为数据采集和数据处理2部分.实验证明,系统能实时精确地显示单片机采集的信号.     

基于EPOLL机制的实时监控传输系统的设计与实现

受最大连接数、数据带宽等因素的影响,图像传输质量波动性较大,导致现有视频监控系统传输效率较低。基于EPOLL机制完成实时监控传输系统的设计与实现,建立EPOLL机制模型,分析摄像头与Linux内核架构的关系,定义图像传输协议,实现客户端图像帧请求及数据解析,最后于GTK+平台实时显示。实测数据验证,相对于传统的SELECT和POLL模型,EPOLL模型的适应性更强、传输效率更高、稳定性更好,为视频采集、视频监控等实时应用提供了一定的参考价值和技术支撑。     

基于LabVIEW的局域网监控报警系统

基于LabVIEW虚拟仪器平台开发出的局域网监控报警系统,该系统通过监控服务端采集实时图片,并利用TCP传输协议,将监控现场图像信息实时发送到监控客户端。并通过图像报警模块判断监控区域是否有异常情况发生,从而触发报警,并将报警信号和报警图片实时发送到监控客户端,在监控客户端触发报警。通过本系统进行局域网监控报警测试结果表明:该系统监控稳定,报警灵敏,图像传输保存稳定高效,具有较高的监控安全性,系统构建简单,造价较低,实现了局域网监控报警功能。     

基于AT89S52的多路数据采集系统的设计与实现

设计了一种基于AT89S52的多路数据采集系统.该系统由两路串行A/D转换器ADC0832、单片机AT89S52、外扩62256 RAM和LED数码显示等组成,其中给出了系统设计原理框图、硬件接口电路图和软件设计流程图.通过对两路波形信号进行采集、处理和显示,结果表明该系统能实现多路数据的实时采集、数据处理和显示输出等功能,具有较好的通用性,可广泛应用于工业自动控制领域.     

嵌入式图像处理与接口设计研究

该文介绍了两种用于嵌入式系统的数字图像采集接口方法,I／O接口和内存直接写入．对采集速度要求不高的应用中,I／O接口方法可以简化接口电路设计,减少系统资源．对于要求实时进行图像处理的系统,直接写入内存法可以在不需要处理器干预的情况下,直接将图像数据写入系统存储区内,实现高速图像采集．     

数字图像采集接口电路设计方法

本文介绍了两种用于嵌入式系统的数字图像采集接口方法,I/O接口和内存直接写入。在对采集速度要求不高的应用中,I/O接口方法可以简化接口电路设计,减少系统资源。对于要求实时进行图像处理的系统,直接写入内存法可以在不需要处理器干预的情况下,直接将图像数据写入系统存储区内,实现高速图像采集。本文主要讨论I/O接口方法。     

ZigBee技术在电压监控预警系统中的应用

为了实现大型工厂或社区电压检测的网络化管理,采用ZigBee技术设计了电压无线通信监测预警系统。监控系统分为上位机和下位机两部分,通过Visual Basic编程语言,利用可视化插件及图像绘制算法开发监测预警平台,收集由协调器经串口发送给计算机的采集数据,以实现上位机采集电压数据,绘制实时图像以及超标报警的功能。利用IAR集成开发环境,通过使用Z-Stack协议栈控制ZigBee网络中各个ZigBee模块,以实现ZigBee网络的组建以及对电压数据采集、数据传送和数据接收功能。     

汉字倒说

汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

钱生钱!

我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了     

Inequalities for inscribed simplexes

The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex.     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

微薄的薪水,高尚的情操

现在,我们可以没有面包,没有钱,没有房子,没有车子……但我们唯独不能丢失的是高尚的情操,笃定的信念,还有,满满的希望!     

Virtual reality approach for 3D large model browsing on web site

Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching.