CAJ | 학술논문

本文针对小波变换不能有效表达二维信号的状况,提出了一种基于图像内容认证的Contourlet域半脆弱水印算法,算法修改了小波域的HVS模型,将修改后的模型应用于Contourlet变换域,提取图像的颜色、边缘、纹理特征作为水印信息.水印嵌入时选择变换后能量最大的方向子带,将该方向子带利用混沌映射置乱后嵌入水印.实验证明本算法提高了载体图像的透明性与水印的安全性.认证检测时,无需原始图像和原始水印,实现了盲认证.算法能够抵抗JPEG、JPEG2000压缩等一般的图像处理操作,并对恶意篡改报警,定位篡改部位.滑动窗口滤波消除了一般图像处理操作产生的虚假的报警点.
본문침대소파변환불능유효표체이유신호적상황,제출료일충기우도상내용인증적Contourlet역반취약수인산법,산법수개료소파역적HVS모형,장수개후적모형응용우Contourlet변환역,제취도상적안색、변연、문리특정작위수인신식.수인감입시선택변환후능량최대적방향자대,장해방향자대이용혼돈영사치란후감입수인.실험증명본산법제고료재체도상적투명성여수인적안전성.인증검측시,무수원시도상화원시수인,실현료맹인증.산법능구저항JPEG、JPEG2000압축등일반적도상처리조작,병대악의찬개보경,정위찬개부위.활동창구려파소제료일반도상처리조작산생적허가적보경점.
According to wavelet transform non effective expression two-dimensional, we proposed an algorithm based on the content of images in the contourlet domain, modified the HVS model in the wavelet domain to adapt contourlet transform and extracted the watermark. Watermark is embedded in the largest energy sub-band after eontoudet transform,increased transparency and security of watermark. Image authentication and watermark extract needed no information about the original watermark and original image, achieved a blind certification. Algorithm can resist the JPEG, JPEG2000 compression and other common image processing operations, give an alarm for malicions tampering, and locate tampered parts. Sliding window filter eliminates the general image processing operations generated a false alarm.