System Of Real-time Compression Of Aerial Video Based On H.264

75% of the human information is from the visual system.With the development of information technology and the increasing demand, the visual system in people's productions and lives is more and more attended ,and is gradually realized and applied.As the limitations of human beings and real-time demand, it makes UAV real-time aerial applications and technologies to develop constantly.The size of unmanned aerial video data is generally large, if we transmit it through the network back to the ground in real time,we will be limited to the low transmission rate and the poor stability of wireless network, so firstly we need to compress the video data in real time.For the above reasons, in my research a complete set of method for experiment will be shown. There are many video compression technologies, such as the MPEG series, but the video compression technology based on H.264 in compression efficiency and network compatibility is better than other compression technologies. Unmanned aerial vehicle's load is generally small, so the embedded system is used as the running platform of H.264. The embedded system is based on ARM chip and Linux which is open source operating system. Because the performance of ARM's processor is lower, so the project was developped under the architecture of the X86 of Intel . As the architecture of ARM is different from X86, so the experiment needs to cross compile.After the experiment, H.264 and the related software were transplanted to the ARM experiment board, and we acquire, compress the video data, and translate them through the network back to ground successfully.With the actual target's characteristics and the actual demands, the original algorithms in intra and inter prediction were improved, and the macro blocks were divided with the rough mode, the encoding rate of real-time compression is improved greatly. In order to further improve the performance of encoding,the parameters of H.264 were optimized, and the rate of compression was close to the real-time requirement. The modular design contributes to the upgrade of the system, improves the operation and efficiency of development, and it also can help us deploy the modules of the system to the pipeline architecture based on hardware of parallel system.