Data Compression of Ultrasonic Flaw Detection for Trains′ Wheels Based on IWT
-
摘要: 针对一代小波变换阈值压缩算法实现复杂、实时性差且存在浮点系数等问题,提出了一种基于整数小波变换的机车轮对超声检测数据阈值压缩算法,从阈值函数和非零系数位置标记两个方面对传统阈值压缩方式进行了优化,并与传统阈值压缩方式和基于一代小波变换的阈值压缩算法的压缩效果进行了对比.结果表明:该算法在超声检测数据的压缩中能够获得更高的压缩倍数和重构精度,具有良好的应用前景.Abstract: There are some shortcomings for the threshold compression algorithm based on traditional wavelet transform,such as complex,poor real-time,floating-point coefficients and so on.As such,this article proposes a threshold compression algorithm based on IWT that applies in the data compression of train wheels of ultrasonic flaw detection.The algorithm optimizes threshold function and the marking method of position of non-zero coefficients.By contrast with the compression effect of traditional threshold compression and algorithm based on traditional wavelet transform,it shows that the algorithm the article proposes can get higher compression ratio and reconstruction accuracy,which has good application prospects.
-
Keywords:
- Ultrasonic flaw detection /
- Data compression /
- IWT /
- Threshold process
-
-
[1] 纪凤珠,孙世宇,王长龙,等.模糊提升小波包变换降噪法在漏磁检测信号处理中的应用[J].无损检测,2011,33(5):22-24. [2] CALDERBANKR,DAUBECHIESI,SWELDENSW,et al.Wavelet transforms that map integer stointegers.Princeton[R].USA:Princeton University,1996. [3] 闰常友,杨奇逊,刘万顺.基于提升格式的实时数据压缩和重构算法[J].中国电机工程学报,2005,25(9):6-10. [4] 王佳旭,李晓光,丁伯愿,等.基于小波变换的X射线焊缝缺陷图像处理[J].无损检测,2009,31(12):998-1001. [5] 孙延奎.小波分析及其应用[M].北京:机械工业出版社,2005:101-103. [6] 闫浚.管道超声检测系统中数据压缩算法的研究与实现[D].上海:上海交通大学,2007. [7] KIM S C,KANG T J.Automated defect detection system using wavelet packet frame and Gaussian mixture model[J].JOSA A,2006,23(11):2690-2701. [8] 赵阳,梅劲松,石峥映,等.机车轮辋超声检测信号的数字处理技术[J].无损检测,2012,34(9):23-26. [9] 张臻,于海勋.光纤缺陷的超声信号小波阈值去噪改进算法[J].无损检测,2009,31(12):895-897. [10] 孙金凤.电力数据压缩传输及解压算法的研究与实现[D].北京:北京化工大学,2008. [11] 王雪梅,倪文波,王平.高速铁路轨道无损检测技术的研究现状和发展趋势[J].无损检测,2013,35(2):10-17.
计量
- 文章访问数: 5
- HTML全文浏览量: 2
- PDF下载量: 7
下载:
