CAJ | 학술논문

针对离散余弦变换（DCT）的特点,提出一种自适应水印算法.选取JPEG量化矩阵若干DCT中频系数,并求均值,比较嵌入位与均值的关系,调整嵌入位的大小实现水印自适应嵌入.利用Arnold变换对水印信息进行预处理和后续处理,降低水印信息的相关性;同时用随机控制方法选取水印嵌入图像块,用于控制随机选取块的密钥作为该算法的一个密钥,实现水印的加密处理,提高水印的安全性.实验表明,该算法在保证隐蔽性的前提下,水印提取效果较好,对旋转、剪切、JPEG、修改等攻击具有较好的鲁棒性和稳健性.
침대리산여현변환（DCT）적특점,제출일충자괄응수인산법.선취JPEG양화구진약간DCT중빈계수,병구균치,비교감입위여균치적관계,조정감입위적대소실현수인자괄응감입.이용Arnold변환대수인신식진행예처리화후속처리,강저수인신식적상관성;동시용수궤공제방법선취수인감입도상괴,용우공제수궤선취괴적밀약작위해산법적일개밀약,실현수인적가밀처리,제고수인적안전성.실험표명,해산법재보증은폐성적전제하,수인제취효과교호,대선전、전절、JPEG、수개등공격구유교호적로봉성화은건성.
Aiming at the characteristics of Discrete Cosine transformation to propose an adaptive digital watermarking algorithm was proposed,Some medium frequency DCT coefficients with JPEG matrix were selected and their mean was calculated,and after comparing the mean with the embedded coefficient,watermarking embedded adaptively was achieved by adjusting the value of embedded coefficient.The pretveatment and subsequent treatment on watermarking were conducted by Arnold transformation to reduce the relativity among watermarking dates.Embedded image blocks were chose randomly with a key,and the key was regarded as a key of the algorithm to achieve watermarking encrypted and improve the security of the algorithm.The experiment shows that the algorithm has a good effect on extracted watermarking,enough robustness and toughness for some common image processing operations,such as rotation,cutting,JPEG compression,altering,etc.