无人飞行器超低延时高速并行图像压缩系统  

Rapid and parallel image compression system with ultra-low delay for unmanned aerial vehicles

作　　者：李其虎[1,2] 文运丰[1] 贾瑞才[1] 肖嵩[2] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081 [2]西安电子科技大学综合业务网理论及关键技术国家重点实验室,陕西西安710071

出　　处：《光学精密工程》2013年第11期2914-2921,共8页Optics and Precision Engineering

基　　金：中国博士后科学基金资助项目(2013M541202)

摘　　要：针对无人飞行器测控系统对图像压缩技术在超低延时与高速编码方面的特殊需求,研究并设计了一种全硬件并行图像压缩系统,该系统采用基于小波分析理论联合零游程编码与指数哥伦布编码技术完成对信源数据的压缩。利用小波分析去除像素相关性,引入最优量化方式,采用零游程编码结合指数哥伦布编码去除像素概率冗余。算法在现场可编程门阵列(FPGA)中设计了一种并行处理模式,使得图像采集、变换与各个小波子代系数编码近似同步进行。实验结果表明,该压缩系统在型号为XILINX-VIRTEX-5-XC5VSX50T器件中可以同时满足4路分辨率为2 048pixel×2 048pixel×12bit高清图像压缩,单路数据吞吐量达280Mpixel/s;针对1 024pixel×768piexl格式图像编解码传输,延时低于100ms。A hardware parallel image compression system was designed according to the special re- quirements of unmanned aerial vehicles （UAVs） for image compression in low delay and high speed coding. A compression algorithm based on the wavelet analysis theory combined with zero-run-length coding index Columbus was designed for source coding techniques. In the algorithm, the wavelet anal- ysis was applied to remove the redundancy of pixels, and the optimal quantization was introduced to remove the redundancy of pixel probability by zero-runqength encoding and exponential Columbus. The proposed algorithm was realized in a Field Programming Gate Array（PF（iA） by a designed mode dec propagation delay is less than 100 ms for the format of 1 024 pixelX 768 pixel.

关 键 词：无人飞行器 图像压缩 信源编码 并行处理 小波分析 超低延时 

分 类 号：TN919.8[电子电信—通信与信息系统] V279[电子电信—信息与通信工程]