zero-phase wavelet

The zero order V-system is just Haar wavelet.

0次V系统恰是Haar小波。

With the earth as current loop, the zero-modal current is large in impedance, and the traveling wave runs slowly, so the line-modal current signal caused by the transmission line fault is processed with wavelet transform.

由于零模电流以大地为回路，其波阻抗大，并且行波波速比较慢，所以，文中对输电线路故障后的线模电流信号进行小波处理。

Partial wavelet coefficients can't be set zero when the threshold is undersize so parts of noises are retained and some useful signals will be taked off when the threshold is iusto major so parts of useful signals are lost.

如果阈值选取过小，那么有一部分的噪声小波系数将不能被置零，从而在去噪后的信号中保留了部分噪声信息，使去噪的效果变差。

Based on the good statistical feature of wavelet image, it presents a study of the most popular coding methods: embedded zero wavelet ( EZW), set partitioning in hierarchical trees ( SPIHT).

并根据灰度图像经小波变换以后系数的分布、统计特性，对现今十分流行的嵌入零树（EZW）、分层树集合分割排序（SPIHT）算术编码方法进行研究。

According to zero-watermarking, a zero-embedding algorithm for multiple watermarks was proposed based on wavelet and chaos.

摘要根据零水印概念, 提出一种基于小波和混沌的多重水印零嵌入算法.