安全性是數字水印的重要指標之一，基于混沌序列的優良性能，本文提出一種基于混沌映射的DCT 域水印算法。將混沌序列作為水印信息，加入到載體圖像離散余弦變換（DCT）域的頻率成分中去。利用了混沌序列的難以偽造性來提高水印的安全性，實驗結果表明，該算法對于抵抗各種噪聲、濾波和壓縮等攻擊具有很好的魯棒性。
關鍵詞： 數字水印；混沌；DCT 域；安全性；魯棒性
Abstract: Security is one of the important requirements of digital watermarking. In the paper a
new digital watermarking algorithm based on chaos is proposed. This method uses chaos sequence to generate watermarking. After added it on to graph’s DCT transformation frequency component, because chaos sequence is hard to fabricate, so the security of digital watermarking is improved. Experimental results show that this algorithm is very robust against the typical image processing attacks such as noise , filtering and compression.
keyword: Digital watermarking；Chaos; DCT；Security；Robustness