Regularity Guaranteeing Implementation of DWT Designed under Lifting Structure
This report introduces a regularity guaranteeing section in implementation of a discrete wavelet transform (DWT) to reduce an artifact, which is due to finite word length expression of coefficients, in a reconstructed signal. The DWT is initially designed to satisfy the regularity under long enough word length of coefficient values. However these are truncated to shorter length in implementation to reduce computational cost. Then some errors are observed in a reconstructed signal. In this report, we implement the lifting DWT in a non-lifting form, instead of the lifting form. It includes a regularity guaranteeing section so that the DWT always satisfy the regularity in spite of shortening word length. It was confirmed that an oscillation in a reconstructed signal was completely suppressed.
Masahiro Iwahashi Hitoshi Kiya
Nagaoka University of Technology, Niigata, 980-2188, Japan Tokyo Metropolitan University, Tokyo, 191-0065, Japan
国际会议
2011亚太信号与信息处理协会年度峰会(APSIPAASC 2011)
西安
英文
1-4
2011-10-18（万方平台首次上网日期，不代表论文的发表时间）