CAJ | 학술논문

为权衡水印技术的鲁棒性和对篡改敏感性的冲突,本文提出了在载体图像中嵌入鲁棒水印和全脆弱水印的双重数字水印方案.首先对水印图像进行了置乱和加密,并对得到的加密水印进行了扩频处理.接着在混合变换域内实现了对加密扩频水印的嵌入:先对图像载体进行小波变换和离散余弦变换,通过修改各块的部分余弦系数的差值实现水印信息的嵌入.提取时实现了盲水印提取.实验结果表明,该算法具有很强的安全性和不可见性,对抗噪声和剪切攻击具有良好的鲁棒性.
위권형수인기술적로봉성화대찬개민감성적충돌,본문제출료재재체도상중감입로봉수인화전취약수인적쌍중수자수인방안.수선대수인도상진행료치란화가밀,병대득도적가밀수인진행료확빈처리.접착재혼합변환역내실현료대가밀확빈수인적감입:선대도상재체진행소파변환화리산여현변환,통과수개각괴적부분여현계수적차치실현수인신식적감입.제취시실현료맹수인제취.실험결과표명,해산법구유흔강적안전성화불가견성,대항조성화전절공격구유량호적로봉성.
In order to balance the collision between the robustness and the sensitivity tampering of the watermarking technolo-gy, a dual digital watermarking scheme which embeds robust watermarking and fragile watermarking into the carrier images is pro-posed. A scramble operation and encryption to watermarking images are first prosecuted. A spread spectrum technique is used in the encrypted watermarking. Then, we embed an encrypted spread spectrum watermark into the hybrid transform domain: the experi-ment first performs discrete wavelet transform and discrete cosine transform to the carrier image, and then embeds the watermarking message by changing part of each block DCT coefficient. The receiver realizes blind watermarking extraction. The experimental re-sults show that this algorithm possesses better secrecy and invisibility, and has good robustness to noise and cropping attacks.