- 學位論文
PDA作業系統之無線遠端監控
Wireless Remote Monitoring Utilizing Personal Digital Assistant System
摘要
本研究目的在發展一套適合於PDA作業系統上之無線遠端監控系統。透過TCP/IP通訊協定在乙太網路上傳輸控制指令到PC Server端，監控攝影機傳回Server端影像，並可控制攝影機變焦與驅動旋轉機構之水平和垂直方向馬達運轉。 本系統配合無線網路設備以主從式架構建立近端PC與遠端PDA連線。影像傳輸方面，在近端電腦擷取影像，以影像偵測選取所要傳輸的影像，運用影像內插法縮小影像尺寸，再經過JPEG影像壓縮與分割影像資料後，傳輸最後分割的影像資料；在遠端PDA上接收及組合影像資料與時間序列，並以Motion JPEG方式顯示近端影像，達到即時影像的效果。控制方面，由遠端傳輸控制命令，近端接收到控制命令後經由RS-232下達命令至控制器，驅動步進馬達帶動攝影機到達所要的位置。 本研究所設計的PDA無線網路監控系統，以240×320像素大小的影像為例，經過JPEG壓縮，壓縮率為95%，在實驗室區域網路的環境下進行傳輸，可達到每2.7秒傳輸一張影像畫面。
並列摘要
The purpose of this research is to develop a wireless remote monitoring system under the operation system of PDA. Through the connection of TCP/IP on the Ethernet, the codes in the system can be transferred to the PC Servers for capturing the images transmitted from a camera, adjusting the imaging focus, and driving the motors installed on the camera mount. This system is equipped with wireless connection to set up the Server and Client, a PC and a PDA, respectively, to transmit the images. In general these images are first captured by the Server. An image detector is then used to select the targeted images. An image interpolation technique is used to minimize the image sizes. Finally, after the process of compression and division according to the format of JPEG, these images are transmitted. On the other hand, the Client (PDA) receives and assembles the targeted images and time sequences and then the real-time images can be obtained with the format of Motion JEPG. At the mean time, the control codes are sent to controller through the RS-232, to drive the step Motor and move the speed dome camera into targeted position. Utilizing the proposed wireless system, experimental results show that one image with a size of 240ｘ320 pixels and a compression of 95%, can be transmitted within 2.7 second through the local area network.