The Research Of MPEG-4 Video Capture And Compression System Based On DSP And VxWorks

Train's monitoring and recording device in running can control train's running accurately by sampling and recording various message of the train in time .It is the important device of protecting train's security.In all recorded data,video is the most veritably and directly when reappearing the fact of the time. The video capture system of the device can record the fact of the load and the cab in time.When accident happened ,the reason will be found out with video reappearance device.Base on the purpose,this thesis introduces the study and design of the video capture and compression system which is one of the important part of the train's monitoring and recording device.This thesis illustrates the design of MPEG-4 video capture and compression system based on TMS320DM642 DSP. It particulary introduces the process of driver development in VxWorks, and all kinds of techniques to optimize the MPEG-4 program.Firstly, this thesis introduces the theory of MPEG-4 encorde.Then it introduces the embedded operate system VxWorks and the common developing flow of device driver under the VxWorks.Then it analysis the hardware of the system and introduces the system as a whole,the video A/D chip,the video encode chip and the PCI bus. Finally,it introduces the realization of software of MPEG-4 encode and optimization to DSP.