Technology Research, Based On Tms320dm642 Video Image Processing

In this paper, the Evaluation Board TDS642EVM which takes the TMS320DM642 core is chosen as a hardware development platform to do the research of video compression and encryption coding.In the part of video compression encoding, the H.264 coding standard is selected as the object of study. In the paper, H.264 coding principle and the main technical has been analyzed. Combined with the characteristics of DM642, the open-source X264 encoder is transplanted to the DSP platform. Further more, the algorithm is optimized from the project level, C language level and linear assembly level. After testing, the optimized encoder has realized the real-time coding compression to the video form CIF. And then the Network Developer's Kit provided from TI is used to realize network transmission and storage of the encoded video from the EVM to PC, building a complete platform of network camera.In the part of video encryption, taking the requirements of video encryption into account, the thesis analyzed the performance of the current video encryption algorithm and studied a algorithm of chaotic encryption for the H.264. According to this algorithm we designed encryption scheme and carried on the simulation. The pseudo-random sequence which is generated by the Logistic mapping produces two groups of keys, which encrypt in intra-prediction mode, the coefficient after the transform and quantization, the motion vector, respectively. The simulation result indicated that this algorithm has security and real-time, having little influence on the coding compression and a certain degree of data interoperability, satisfying the requirement of video data encryption.