针对地震勘探数据压缩的JPEG 2000算法改进  

The Compression of Seismic Data Based on JPEG 2000

作　　者：张正炳[1] 杨顺辽[1] 徐锋涛[1] 桂志先[2] 

机构地区：[1]长江大学电子信息学院,湖北荆州434023 [2]长江大学地球物理与石油资源学院,湖北武汉430100

出　　处：《长江大学学报（自然科学版）》2017年第21期1-6,共6页Journal of Yangtze University(Natural Science Edition)

摘　　要：为减轻海量地震数据给地震勘探的远程质量监督所带来的巨大压力,对静止图像压缩标准JPEG2000算法进行了适当改进:去掉了原编码算法中用于均值调整的预处理和用于色彩处理的分量间变换2个部分及其在解码器中的对应部分,改进了数据输入输出的动态范围和编解码器所能表示的数据动态范围,使其与地震数据的大动态范围相匹配。利用改进后的算法对地震数据进行压缩试验,结果表明,对叠前数据压缩5倍以下时,信噪比高于42dB,效果较好,对叠后数据压缩15倍以下时,信噪比高于30dB。To reduce the pressure of massive seismic data on the remote control of seismic exploration,JPEG 2000 algorithm with excellent performance for image encoding is properly modified for a suitable seismic data compression.The modification includes that the preprocessing and forward Inter-component transform in the encoding algorithm of JPEG2000 and their counter-parts in the decoding algorithm are removed,and the dynamic ranges of both the data I/O and the entropy encoder/decoder are improved to adapt the large dynamic range of seismic data.The modified algorithm is used to compress both pre-stack and post-stack seismic data.Experiment results show that when pre-stack data are compressed with compression ratio below 5∶1,the SNR of the decompressed data is more than 42 dB,and when post-stack data are compressed with compression ratio below 15∶1,the SNR of the decompressed data is more than 30 dB.

关 键 词：地震数据压缩 JPEG2000 地震勘探 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]