基于時(shí)空二維混沌的數(shù)字水印算法

本文提出一種將時(shí)空二維混沌應(yīng)用到數(shù)字水印中去的算法。首先利用時(shí)空二維混沌直
接生成信息模板，加入到作品圖像離散余弦變換（DCT）域的頻率成分中去。合法使用者通過時(shí)空混沌中的初值和耦合系數(shù)來重新生成信息模板，與作品進(jìn)行相關(guān)比較進(jìn)行檢測。由于時(shí)空二維混沌具有密鑰空間大、參數(shù)敏感性的特點(diǎn)，該算法具有很高的安全性。實(shí)驗(yàn)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。
Abstract: A new digital watermarking algorithm based on spatiotemporal chaos is proposed. This method firstly used two-dimensional chaos to generate template. After DCT transformation, graph’s frequency component was added with the template. The receiver used chaos’s initial value and coupling coefficient to regenerate the template. Through the comparison, the user can confirm the work’s copyright. Because the spatiotemporal chaos system has huge key space and was sensitive to the initial parameter, this method shows great security. Experimental results show that this scheme is very robust against the typical image processing attacks such as noise , filtering and lossy compression.