无人机H.265双路视频传输系统的设计与实现

针对无人机视频传输设备接口兼容能力差、编码速率高的现状,设计了兼容高清多媒体接口(High Definition Multimedia Interface,HDMI)、串行数字接口(Serial Digital Interface,SDI)、复合同步视频广播信号(Composite Video Broadcast Signal,CVBS)三种接口的低码率视频传输系统。系统以Hi3519为核心,采用H. 265的方式编码。在接口兼容方面,通过搭配不同的视频接口芯片,兼容多种视频输入接口;在编码效率方面,同时压缩两路1080p60视频仅需3. 2 Mb/s的压缩码率。相比采用H. 264编码方式、需要视频接口转换器的方案,采用一片主处理器和多种视频接口芯片的方案具有低成本、低功耗、小体积的优点,更适用于无人机。通过搭建无线链路测试了系统的视频传输性能,结果表明,系统连接可靠、易于操作,可以实现实时、稳定的传输。

Design and implementation of an H.265-coded dual channel video transmission system for UAV

For the current situation of poor compatibility and high coding rate of video transmission equipment for unmanned aerial vehicle(UAV),a low bit rate video transmission system compatible with high definition multimedia interface(HDMI),serial digital interface(SDI) and composite video broadcast signal(CVBS) interfaces is designed.The system takes Hi3519 as the core and adopts H.265 video encode algorithm.In terms of interface compatibility,various video input interfaces are compatible with different video interface chips.In terms of coding efficiency,it only takes 3.2 Mb/s to compress dual 1080p60 input video at the same time.Compared with the scheme adopting H.264 video encode algorithm and requiring video interface converter,the proposed scheme that uses one main processor and multiple video interface chips has the advantages of low cost,low power consumption and small size,and it is more suitable for UAV.The video transmission performance of the system is tested by setting up a wireless data link.The results show that the system designed is connected reliably,easy to operate,and can realize real-time and stable transmission.