Velocity Of River Flow Monitoring System Design Based On Video Processing

There are many numbers of rivers in our country. The comprehensive utilize of those possesses a significant status in the development of national economy and society. Flood and drought happens frequently in our country which causes enormous lose. Besides, uneven distribution and shortage of the water resource, in order to reasonable utilization, we need to regulate timely. To solve these problems, we need to rely on the hydrological monitoring information. The velocity measurement is one of the main works of the hydrological monitoring, but the current flow velocity measurement method has certain limitation in application. With the rapid development of multimedia technology and wireless network, at the same time embedded systems have been widely used in various fields in society, we can combine their own characteristics to design a small volume, accurate, convenient and flexible system, wireless video monitoring technology is applied to the new method for measuring flow velocity.The new method of measuring the flow velocity of this article is designed for river rapids during high flood, water level plummeted or skyrocketed, large sediment concentration, more mixture content, and the traditional speedometer cannot be used. The method of video surveillance technology is applied in the paper, the use of camera capture video images of the buoy in the river, through the camera calibration, a reasonable camera projection model is established, the coordinate information of monitor image is correctly switched to the actual surface coordinate information, and video image processing technology is applied for buoy detection and tracking to determine the trajectory of the buoy, in order to achieve the river flow velocity measurement.On hardware, the system makes use of AT91SAM9260ARM processor of Atmel Company and the TMS320DM642DSP chip of T1Company as the main hardware system architecture. ARM mainly makes use of control, lying in the core of system and having unique advantages in terms of communication and real-time control, and ARM hardware circuit could be designed. DSP mainly make use of compute, operating the timely processing of the video image data and greatly reducing the computation time and DSP hardware circuit could be designed. Information between the ARM and DSP is exchanged through the HPI interface, at the same time ARM is connected with WIFI wireless module through the USB interface, and the results will be long-range wireless transmission to the monitoring center. On software, using the Linux operating system builds Software development platform for central control module ARM, and the drive program of ARM peripheral device is designed. At the same time, CCS integrated development environment is established for video image processing module DSP, and using RF5software framework develops DSP software. DSP video processing module includes target detection algorithm design and target tracking algorithm design; it combines with monitoring system working environment to select the appropriate target detection algorithm and target tracking algorithm, and simulation.Designing a velocity of river flow monitoring system based on video processing can be well adapted to work in poor conditions, such as in wild remote places; it’s able to achieve the function for unattended regimen, which can be timely transmitted to the monitoring center, and the staff can analyze the data, it will provides a scientific basis for the rational management of water resources or flood prevention.