Design And Implementation Of Embedded Streaming Video Monitoring Systems

In recent years, with the development of multimedia technique and wireless transmission technique, video capture and video transmission system based on embedded streaming technique is developing rapidly. This technique becomes a key technique in the field of remote video monitoring, video conference and industrial autocontrol. So it has extensive applications and great social and economic benefit to research the popular video coding-decoding technology and transmission technology of streaming media on embedded platforms.This paper takes the exploitation of a practical embedded video monitoring system as the background and studies the key techniques of embedded system. Besides, the type selection of embedded hardware platform, the design and the implementation of software system on embedded video monitoring server are studied in detail.This paper studies the popular structure frame of embedded streaming communication systems combining with the demanded specifications of the system. As the series of i.MX microprocessor based on freescale's ARM926EJ-S^TM core is capable in real-time MPEG4 and H.263 coding-decoding and it has many advantages in multimedia applications,we have selected MC9328MX21VM microprocessor of i.MX21 as the key component of the hardware platform.Besides,we have selected the free software ARM Linux operating system as the software platform; After analyzing the simulation testing and taking into account both compressibility and computational cost, we have selected MPEG4 as the criterion of video compression; What's more,we have selected the real-time streaming transport protocols RTP/RTCP and RTSP as the multimedia transport protocols.This paper introduces the design and reduction of the embedded ARM Linux core, the design and grafing of graphic user interface and the exploiting of the hardware equipment driver in ARM Linux system in detail. Specially, the implementation of multimedia data capture, coding and transmission in embedded system are studied in particular. The structure of system has good expansibility and clear framework. With this system, we can carry out wireless video monitoring, and the system is miniaturized, low power comsumed, reliable and stable.