基于i.MX6无人机视频码率受控的压缩系统设计

针对无人机数据链视频数据信道带宽受限要求,采用飞思卡尔i.MX6的嵌入式视频处理硬件平台,设计无人机视频H.264压缩码率受控系统,解决压缩编码的运动估计搜索范围、最大关键帧间距问题,在数据传输中采用SPI接口缓冲区码率控制机制,控制系统SPI输出码率受限的设计。实验测试表明,设计的视频处理系统视频压缩数据受控,可根据无人机无线信道设计要求,完成无人机视频压缩编码码率可控视频传输。

Design of the Embedded Video Compression System for Video Data Rate Controlled Based on i.MX6

For the output bit rate of UAV airborne video compression system is unstable and the bandwidth of wireless channel is limited. This paper based on i.MX6 video processing hardware platform to compress video data that have been taken by H.264 standard. Basing on the motion estimation search range,the maximum spacing design of the key frames and using buffer rate control mechanisms to control the output bit rate,the problem of wireless channel's limited bandwidth is solved. The experimental results show that compared with the system which is not used the rate control mechanism;the proposed approach can guarantee the stable output bit rate and small amount of data after processing.