摘要
雷达视频数据在传输过程中必须进行压缩,由于雷达数据的敏感性,压缩过程一般都采取无损压缩。作为一种性能优异的字典压缩算法,LZW算法被广泛应用于当今各类数据压缩领域。针对雷达数据传输高实时性要求以及LZW算法大部分时间花费在字典检索过程的特点,提出一种利用哈希表对LZW算法进行优化改进,从而显著降低检索字典时间的新方法。通过对雷达数据、图片数据和文本数据进行编码并对比各自的编码速度,证实了优化算法的有效性。最后使用真实的雷达数据对该算法进行实际验证,并与游程编码进行对比,得到一些有用的结论。
Radar data must be compressed before transmitted and the non-destructive compression method is used because of its importance normally. LZW algorithm is an excellent dictionary compression algorithm and which is widely used in the field of compression. For high real-time requirement of radar data transmission and the character of LZW algorithm that which spends most of time in dictionary retrieval process,a hash table is used to optimize LZW algorithm by decreasing the dictionary retrieval time. The encoding speeds with optimized LZW algorithm of three kinds of data including picture data,radar data and text data are compared and which get a better result. At last,the optimized LZW algorithm is compared with the RLC algorithm with real radar data in a simulation experiment and gets some useful conclusion.
出处
《舰船科学技术》
北大核心
2015年第11期120-123,共4页
Ship Science and Technology
