Design And Implementation Of Video Capture In Water Quality Online Monitor System

This paper have designed a kind of Water Quality Online Monitor System, this system is comprised of following components: eBox, GPRS Modern, detect instrument, camera and Monitoring Center. eBox is the hardware package housing the Water Quality Online Monitor System gets the water quality data from detect instrument by COM interface, the picture from camera by USB bus, communicates with central computer through GPRS modern via Internet, and alarms something exception. This unit runs a customized Windows CE Image. When the Monitoring Center receives the data from eBox, it processes those data and gives instruction to the eBox and give alarm when necessary.At first this paper compendiously introduces the structure of Water Quality Online Monitor System; after that this paper illuminates how to design and program driver of USB device under Windows CE in deeply and implements the vedio capture of Water Quality Online Monitor System. This USB camera driver is divided into MDD (Model Device Driver) layer and PDD (Platform Dependent Driver) layer, in MDD layer include all the vedio stream interface functions and all the USB entry functions which Windows CE needs to support USB device; in PDD layer implement all the function with commucate with the camera to support MDD layer. Discuss how to implement the USB three entry functions: USBDeviecAttach, USBInstallDriver, USBUninstallDriver and the vedio stream interface functions.As well known, although there are abundant of water resource, the fresh water resource is absent in fact. So people should not only save water but also need prevent water to be polluted. Form this sight, develop this system is valuable.