Research And Implementation Of Network Surveillance System Based On H.264and FPGA

This paper presents a solution to the network surveillance system based on FPGA andH.264according to the development in this field home and abroad.The network surveillance system is mainly based on embedded CPU whose core isFPGA、PC and network devices. Real-time image is collected and compressed by embeddedCPU. PC can get access to the image server by network, receiving and displaying the image.In order to improve the H.264algorithm, this paper uses Hardware Describe Language torealize the compression of the image. Intra frame prediction、DCT and quantization andCAVLC are described in this paper. A new intra-prediction algorithm is proposed and itgreatly reduces computation complexity.Image vedio collecting and network transmission are achieved by dual NIOS Ⅱ in theembedded CPU. Image vedio is collected by CMOS image sensor OV9650with1.3millionpixels. In order to achieve multi-task management and network transmission, this paper usesμ C/OS Ⅱand LWIP to accomplish the design. The raw image data are so big that it cannot be transmitted directly. So they must be compressed by H.264to reduce the data quantityand increase the network transmission ability.The network terminals can access to the embedded CPU by visiting the IP address. Thejob has done in this paper includes: transplanting and programming the programs ofμ C/OS Ⅱsupporting LWIP、self-making of the interface circuit of vedio collecting、theshare and coordination of dual NIOS Ⅱ core. This design is based on experimental boxprovided by Altera.This system achieves great success in such fields, including: compression rate、thehigh-definition image and coordination between hardware core and software core. This designhas great prospective with the low budget and wide application fields.