基于特征提取和Delta编码的超声波数据压缩方法

Ultrasonic data compression based on feature extraction and Delta encoding

为了保存超声检测过程中产生的大量数据,通过对超声波数据提取波形沿交点等特征,并在此基础上进行Delta编码,将特征提取与Delta编码进行结合,建立了一份十进制二进制编码表,使编码后所得的数据压缩比提高20%～40%。特征提取和Delta编码可以互补提高压缩比,并且可以根据重构精度的要求动态改变压缩比。最后用实例说明了这种压缩方法的压缩效果和还原效果。

A feature-based combined with Delta encoding data compression method is proposed to preserve massive a-wave data generated by automatic ultrasonic inspection.Special binary codes for representing decimal numbers are introduced to improve data compression ratio.By combining feature extraction with Delta encoding,data compression can be changed according to restore precision.An example is given to explain the compression and restore effect at the end of paper.