基于DCT的数字水印的嵌入和提取

摘要

离散余弦变换（DCT）的这种频域算法能实现数字水印的嵌入和提取，然后对嵌入水印后的载体图像进行加噪、剪切、滤波等攻击实验，能够证明嵌入水印后的图像有较强的鲁棒性，进而说明数字水印技术的实用性．%The frequency domain algorithm for Discrete Cosine Transform(DCT) can achieve embedding and extraction of digital watermark. It proves that watermarking image has strong robustness by adding noise, shearing, filtering to embedded watermark carrier image, so digital watermark technolog is useful.