IMX53Based Real-time Video Surveillance System Design And Implementation

As communications technology, computer technology and the rapid development of multimedia technology, high-quality video transmission is gradually replacing traditional voice and text media, and become the main digital network communications business. Embedded technology, network communication technology and multimedia image processing technology integration, digital video communication is becoming a trend in the field of development and there are broad prospects for development. Currently, based on the embedded video acquisition and transmission system terminal has been rapid development and wide application, but with many areas on the growing demand for high-definition video, currently most of the terminals to provide video data can not meet people the image quality requirements. With the improvement of video resolution, the existing transmission channel bandwidth has gradually become a constraint HD video capture and transmission terminal development bottleneck. Therefore, depending on the application requirements of the field of video quality, research-definition video capture, compression and real-time transmission method, to further improve and popularize high-definition video capture terminal has important significance.In this paper, embedded in high-definition video capture and transmission terminal application conduct research, based on Freescale’s IMX53development platform, the design of a real-time HD video capture and transmission device, the realization of high-definition video capture, compression and transmission. The main contents include the following aspects:First, the introduction CSI interface based HD camera video capture module method, the I2C interface, CSI interfaces, OV3640video sensor and driver model is described in detail; hardware encoding module and then call on the VPU collected the original YUV format HD video sequences encoding the H.264standard hardware compression; followed by half the length of a binary-based stream compression algorithm, designed a secondary high-definition video coding scheme to further improve video coding compression ratio, and thus occupy less network bandwidth; finally based on RTP/UDP/IP for real-time video data transmission scheme, the use of an open source library JRTPLIB to achieve real-time network transmission of video data.In order to verify that the system availability and timeliness of the terminal, the terminal each video capture module, hardware encoding module, the second encoding module and network real-time transmission module functions were tested. Experimental results show that the introduction of the subject software and hardware environment, the terminal capable of video sensor to the resolution of1024x768HD video coding process and the real-time network transfer speeds of up to30fps, and the transmission of the video image the quality is better able to meet the real-time requirements.