| With the development of information technology nowadays, the requirement on the multimedia information, especially the video information, is more and more urgent in many fields, for example, the video monitoring, video telephone and video conference are used more and more widely. Over these years, the video processing technology for mobile device such as train monitoring system, handheld mobile device and military mobile monitoring device becomes a new hotpot and bears a lot of practical applications.This paper is based on the design and implementation of vehicle-carried mobile video processing system, the whole system can capture and compress real-time video image of 720×576 DPI with meeting a certain compression ratio and video quality. We apply FVID drive model to design video capture program. Whereas the system requires higher real-time video capture than compression ratio, we apply JPEG image compression standard as compression method and a dedicated multimedia processor --TMS320DM642 as the hardware device, and in addition, we optimize the system to improve the execution efficiency so that rea-time video capture and compression can be achieved.Based on the actual requirements of the project, we apply JPEG and TMS320DM642 chip to the system after taking a serial analysis to the current video and image encoding standards and mainstream multimedia processing chip.To achieve it, the following works are finished in this paper:(1) Establish a video capture scheme and apply FVID drive model to design video caturing flow to achieve the video capure with frame rate of 25, resolution of 720×576;(2) Analyze each process module of JPEG encoding in details and make the JPEG coding based in CCS development environment is successfully implement on DM642;(3) Combine the special hardware, optimize the program further on such aspects as algorithm, memory configuration, pipeline, EDMA technology to reach the intended goal of processing 25 frame video per second. |
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