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1.
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。  相似文献   

2.
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。  相似文献   

3.
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。  相似文献   

4.
基于USB接口与LabVIEW的数据采集系统设计   总被引:3,自引:2,他引:1  
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.  相似文献   

5.
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。  相似文献   

6.
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。  相似文献   

7.
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.  相似文献   

8.
嵌入式图像处理与接口设计研究   总被引:1,自引:0,他引:1  
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.  相似文献   

9.
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。  相似文献   

10.
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。  相似文献   

11.
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.  相似文献   

12.
风的曲线     
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.  相似文献   

13.
Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F.  相似文献   

14.
《海外英语》2007,(5):44-45
It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,  相似文献   

15.
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/  相似文献   

16.
《海外英语》2007,(5):10-11
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?  相似文献   

17.
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language.  相似文献   

18.
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。  相似文献   

19.
20.
《海外英语》2007,(4):36
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.  相似文献   

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