Design And Implementation Of Vehicle Monitoring System Based On MOST

In the traditional vehicle monitoring system research and development design, vehicle manufacturer always achieve multi-channel video transmission by using point to point method because of selection among the bandwidth and minimum possible cost. This means that, plenty of differential audio and video lines are required to be used, which will inevitably reduce the difficulty of interference by increasing the quality of vehicle harness. However, the transmission speed of data maybe decreased.Therefore, MOST(Media Oriented Systems Transportation, a kind of transportation agreement towards media system) technology emerged. Compared with traditional vehicle bus technology, MOST bus technology has advantage of high bandwidth, possible to carry multiple signals, flexible connection, convenient node expansion and high portability of procedure. As MOST technology is able to transmit multi-channel video /audio data flow only through a pair of unshielded twisted pair or optic fiber, it can effectively overcome the disadvantage caused by point to point transmission mode, and further accelerate the research and development of vehicle multimedia technology.The topic of vehicle monitoring system is proposed to meet the requirement of safe driving for driver, which is also a safety measure to provide relative protection for driver. Thus, this paper puts forward the topic of vehicle monitoring system, and adds master/slave node into MOST link to achieve video acquisition module, power management module and image identification module needed by vehicle monitoring. These three function modules transmit video/ audio data by asynchronous transfer mode, and achieve the connection and communication between each main control node through I2 C bus.First, this paper introduces the background and significance of researching MOST network technology, then clarifies the origin of MOST technology and its application in each field, and finally draws the current research status of vehicle monitoring in the field of vehicle electronics. On this basis, this paper points out, MOST bus technology has good advantage on the aspect of network transmission than other vehicle bus technology, which also provides the superiority of technology researched in this paper.Second, Adaptive control strategy of global brightness is used for image processing to instead of original PCA algorithm, which can modify the previous histogram balanced HE algorithm to adjust global brightness and optimize grey processing by focusing on image data. Technologies applied in this system are including MOST bus technology, power management technology and image identification technology. Moreover, it introduces MOST transmission agreement of vehicle monitoring system as well as the design and detailed achieve method of this agreement, then gives a specific definition of its detailed encapsulation frame format. Additionally, the detailed operation flow applied in vehicle monitoring system, framework, software and hardware environment of MOST transmission agreement are also introduced.Finally, this paper introduces vehicle monitoring system from three aspects, the overall structure, hardware design and software design of system. The overall structure is discussed at first, then the software/hardware structure of each function module is further discussed gradually. After completing the software/ hardware design of vehicle monitoring system, the embedded Linux is selected as operation system of terminal equipment, which finished the system migration accordingly. Then, the developed software system is verified by experiment, testing network environment and hardware platform are established to verify each function unit of this system. What’s more, video acquisition and image identification and other function modules are verified respectively during the test. The test results show that, the system discussed in this paper can achieve the objective of system design basically.