摘要
在井壁超声成象测井系统中,数据传输速率受测井电缆的限制,有必要研究超声成象图象的无损压缩算法。文章提出了一种适合于这种图象的无损压缩方案——分块自适应预测的编码算法。经过实验表明,该算法比较符合超声成象测井图象特点,其压缩倍数较现有无损压缩算法有很大提高,而算法复杂度没有明显增加。同时,整个算法完全是自适应的,无须预置码表,所需内存开销较小,因而特别适用于实时遥测系统。
In ultrasonic well logging, the data transfer rate of the logging system is limited by the transmission cables. Thus, data compression is necessary, but the common compression schemes are found to be not ideal for the well logging data ultrasonic well logging images, which have unique properties. Typical ultrasonic well logging images are studied and a suitable compression algorithm is proposed. Experiments show that this coding scheme is able to achieve higher compression ratios than lossless JPEC and JPEG-LS for the ultrasonic well logging image, while the complexity is comparable. The algorithm is self-adaptive and thus no code table is needed.
出处
《石油仪器》
2010年第1期71-73,10,共3页
Petroleum Instruments
关键词
测井
超声成象
图象无损压缩
Logging
Ultrasonic imaging
Lossless compression of image
