wavelet transform used to decompose singal into wavelet components.Compute the discrete wavelet transform (DWT). This method uses the pyramid algorithm and was adapted from pseudo-code written by D. B. Percival.

基于DWT和SVD的双重水印算法的源代码 包含嵌入 检测 提取-Based on DWT and SVD dual watermarking algorithm source code Extracts contain embedded detection