| In recent years, embedded wireless video monitoring system gradually becomes a mainstream video monitoring way, which is widely used in various fields. By transplanting the mature technology used on land into underwater monitoring field, the performance of video monitoring system will improve, the embedded video monitoring technology also will acquired more and more applications, especially in aquaculture.Considered the actual situation in aquaculture development, a mobile video real-time transmission system is proposed based on the current related technologies of underwater video monitor, which focuses on solving the problems of video data acquisition and transmission, video image display in the browser and the control of the underwater mobile platform. Through the implementation of the design scheme, we built a prototype device of underwater video transmission with low-cost, stable performance and flexible motion.This video transmission system consists of three parts:the underwater mobile platform, the surface buoy and the upper computer. The underwater mobile platform hardware is mainly composed of ARM9 board, USB camera, STM32 board, attitude and depth sensors, propulsion and power, etc. Software is mainly to build a Linux system, including the Bootloader transplantation, kernel reduction and transplantation, the root file system’s making, Boa server porting to arm-linux system and system configuration. In addition, video transmission and motion control application programming is another key of software design. The wireless router, as a surface buoy, is used to set up LAN. The PC or mobile phone can be used as an upper computer, when the user enters the web address of Boa server into the brower of the upper computer, it can access the arm-linux system, realize the collection, wireless transmission of underwater image and remote control of the mobile platform.After completing the system platform construction and software design, this system has realized the functional requirements and reached the expected aim by passing the module test, system jointly debugging, tank trial. This system has advantages of flexible mobility, high transmission speed, easy operation, low costs, and can be applied into real-time mobile monitoring in shallow water environment. |
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