CAJ | 학술논문

几何攻击会使水印嵌入与检测失去同步,影响水印的检测.为解决几何攻击造成的水印同步问题,基于方向可控金字塔变换域特征实现了水印图像旋转失真的检测.结合归一化小波树熵掩码及小波域人眼对比敏感度掩码完成了小波超树的自适应调制,实现了水印信息的嵌入.基于小波超树算法的抗缩放攻击能力以及采用方向可控金字塔变换设计,算法能够抵抗缩放攻击和旋转攻击.仿真结果表明,算法对几何攻击具有较强的鲁棒性.
궤하공격회사수인감입여검측실거동보,영향수인적검측.위해결궤하공격조성적수인동보문제,기우방향가공금자탑변환역특정실현료수인도상선전실진적검측.결합귀일화소파수적엄마급소파역인안대비민감도엄마완성료소파초수적자괄응조제,실현료수인신식적감입.기우소파초수산법적항축방공격능력이급채용방향가공금자탑변환설계,산법능구저항축방공격화선전공격.방진결과표명,산법대궤하공격구유교강적로봉성.
Geometrical attacks can cause the loss of synchronism between the watermarking embedding and the detection,thus have negative effect on watermark detection. To solve the synchronism problem caused by geometrical attacks, features of the steerable pyramid coefficients are used to estimate the rotation of the watermarked image, then adaptive wavelet tree modulation employing normalized wavelet tree entropy mask and contrast sensitive function is applied to embed the watermark. Owing to the super tree algorithm's ability of resistance to scaling attack and adoption of steerable pyramid, the proposed algorithm can resist both scaling attacks and rotating attacks. The simulation result indicated that the proposed algorithm can efficiently resist geometric attacks.