| With the continuous development of communication technology, especially the rapid development and popularization of the computer network, image processing and transmission technique in recent years, image or video is widely applied in network. Current IP Network has no guarantee of quality. The real-time video stream delivery which is the focus and difficulty in communication area, can meet the QoS requirements, and will have important meaning.The core of video communication is the image encoding and decoding. H264 is the latest video coding standard, which is developed by Joint Video Team (JVT) joined by both ISO/IEC Motion Picture Experts (MPEG) and ITU-T Video Coding Experts Group (VCEG). Compared with the previous standards, under the same image quality, it has better encoding efficiency as well as better Internet adaptability and error robustness. Therefore, it is considered wildly as the next-generation video coding standard.With the aid of current mature technique of video compression and transmission and according to the current effective demand of troops, this thesis designed a system of real-time video stream transmission and control. The video transmission system was researched by emphasizing the two important targets, real-time and quality, in video/image transmission. The system adopted H.264 video coding standard. In the respect of selecting transmission layer protocol, a new design idea of RTP real-time video transmission based on UDP protocol was put forward by comparing TCP protocol with RTP protocol which can guarantee the real-time and quality of service in digital video transmission. We mainly analyzed the error control and bit-rate control of video signal transmission with the technology of resynchronization marker, data partitioning, and the bit-rate control in picture layer and macroblock layer. The system could ensure the reliability of video data transmission and the restoring quality of images in the communication channel and network. |
PDF Full Text Request