Design Of Image Acquisition System Based On Embedded Linux

The system of embedded image captured has some characteristics, such as flexibility, software and hardware modification, mini-bulk, low cost, low power and system on chip. So, it not only adapts to general image acquisition but also has wide applications on the aspects of railway surveillance and secure inspection.It is an important part of railway detection to detect the wheel's scrape and to measure the wheel's size. It could find the scrape wheel and measure the figure size of wheel well through capturing the wheels image, transmitting image and processing image, so it is an important task that capturing the wheels image.An image captured embedded system was designed and implemented on the background in this paper. After vast researches of the existing image captured system home and abroad, this paper designed the whole system by embedded technology, it made use of ARM and Linux technology for capturing the wheels image.It is composed of two important parts in this image captured embedded system, including hardware and software system. The hardware system consists of embedded microprocessor, interface circuit, camera, LCD and remote computer. The front-end camera takes responsibility of capturing wheels image, then it sends the acquired data to the development board, the board takes responsibility of sending the data to the assigned display buffer in real time for completing image displayed on LCD. Finally, image data was send to remote computer by net. The software system is made up of embedded OS and application software. Embedded OS is build up on hardware platform for driving hardware and providing moving environment to application software. Application program is build up on OS for realizing the every function of embedded image captured system, including image captured, image displayed and image compressed.After confirmed the scheme of this image captured system, it has designed the hardware platform of the system, has build the embedded Linux OS and has designed the program of image captured and displayed as three important parts in the paper. This scheme of hardware platform of the system was made up of core board and equipments around. The core board has a S3C2440A chip which was produced by Samsung as a character of CPU, and based on that the core board was integrated with some necessary resources around. The equipments around was composed of four parts, including USB camera, keyboard, LCD, remote computer. The function of capturing image would come true because it is based on USB camera which has a OV511 chip. Through making use of the function interface of Video for Linux API, the image captured was done.After finished the hardware and software design of the system, system experiments were done. The results of the experiments indicate that the system can accomplish embedded capturing of the image, and reach the anticipated purpose.