基于离散小波变换的图像数字水印算法

提出了一种基于离散小波变换的图像数字水印嵌入提取算法。为保证水印的安全性,在嵌入之前先对水印做置乱处理,选择中低频带嵌入水印信息,以保证其不可感知性和鲁棒性。实验表明,该算法对常见的图像剪切、中值滤波、JPEG压缩和噪声干扰等均具有一定的抵抗力,较好地兼顾了图像水印的不可感知性要求和鲁棒性要求。

A Digital Watermarking Algorithm Based on DWT

An embedding and detecting algorithm for digital watermarking based on discrete wavelet transform is proposed. To ensure the security of the watermark and make the watermark be hard to be extracted, the watermark is scrambled before embedded into the original image. The watermark is embedded into the parts of medium and low frequency coefficients to guarantee its imperceptibility and robustness. The experimental results show that the method is feasible and the embedded watermarks with the proposed algorithm are imperceptible and robust enough against the commonly used image processing such as cropping, median filtering, JPEG compression, and noise etc.