CAJ | 학술논문

针对彩色图像和彩色水印的抗几何攻击鲁棒水印问题，提出一种基于可视加密的算法。该算法利用空域统计相关性，提取载体图像上的鲁棒特征，将其与彩色水印通过彩色可视加密绑定。为抗旋转攻击，提出利用图像的局部结构，提取图像的尺度不变特征点，使用特征点匹配来校正几何攻击的影响。实验结果表明，该算法对于加噪、滤波、JPEG压缩和旋转等攻击具有较强的鲁棒性，特别是在任意角度的旋转攻击下，提取的水印和原始水印的归一化相关值都在95%以上，可应用于医学图像和科学数据图像的保护和认证。
침대채색도상화채색수인적항궤하공격로봉수인문제，제출일충기우가시가밀적산법。해산법이용공역통계상관성，제취재체도상상적로봉특정，장기여채색수인통과채색가시가밀방정。위항선전공격，제출이용도상적국부결구，제취도상적척도불변특정점，사용특정점필배래교정궤하공격적영향。실험결과표명，해산법대우가조、려파、JPEG압축화선전등공격구유교강적로봉성，특별시재임의각도적선전공격하，제취적수인화원시수인적귀일화상관치도재95%이상，가응용우의학도상화과학수거도상적보호화인증。
Aiming at the design of geometric attack robust watermarking system for color image and color watermark, a watermarking system based on visual cryptography was proposed. The robust features of the image were extracted where the spatial correlation were fully utilized. These features were bounded with the watermark by visual cryptography. In addition, the local structure of the host image was analyzed and the Scale Invariant Feature Transform ( SIFT) was used to match the local features between the attacked image and the original image. The experimental results show that this algorithm is robust to most common attacks, such as noise addition, image filtering ( blurring) , JPEG compression and rotation. In addition, for rotation attack with arbitrary rotation angle, the normalized correlation between the extracted watermark and the original watermark is above 95%. This algorithm is applicable in applications such as medical image and scientific image protection, where modifications of the host images are usually not allowed.