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基于代价策略的H.264/AVC半脆弱水印算法 总被引:2,自引:0,他引:2
In order to solve some existing problems on detecting malicious tampering by video watermarking based on H.264/AVC video compression standard,a semi-fragile video watermarking algorithm for H.264/AVC based on cost strategy was proposed.To further improve the robustness of the feature codes in semi-fragile video watermarking algorithm,a new generation algorithm for feature codes by eliminating the correlation of them was proposed.In order to meet the requirement that the semi-fragile watermarks should be uniformly embedded into the video frames to locate the tampered region accurately,a minimal cost function was introduced to select a DCT coefficient in the 4 × 4 block residual to embed watermark which had minimal impact on the video quality and bit rates.Experimental results show that the proposed algorithm can significantly reduce impact on video quality and bit rate because of embedding the watermarking by adopting the minimum cost function and it is sensitive to malicious manipulations.The retrieved feature code and watermarking can detect and locate malicious manipulations. 相似文献
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一种基于视觉模型的小波域图像盲水印算法 总被引:1,自引:1,他引:0
本文提出了一种基于混沌置乱和JND阈值的小波域图像盲水印算法.依据人眼的视觉特性,对宿主图像进行离散小波变换,在小波域子带LH2、HL2幅值较大的系数以及LL2幅值较小的系数中嵌入水印,水印的嵌入采用量化调制的方式,并取JND阈值作为量化间隔,使水印实现盲提取.实验结果表明,在一定不可见性的情况下,此算法对一些常见的水印攻击有较好的鲁棒性. 相似文献
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一种基于H.264/AVC的视频可逆脆弱水印算法 总被引:1,自引:0,他引:1
结合H.264压缩编码标准的特性,该文提出一种新的基于H.264/AVC的视频可逆脆弱水印算法。算法先计算当前宏块预测残差块量化的离散余弦变换(DCT)系数的哈希值生成认证码,再把认证码作为水印信息嵌入到下一个相邻宏块活性最大的4′4块的最后一个非零量化DCT系数中。在解码端,通过比较认证码和提取的水印信息进行视频数据完整性的认证。实验结果表明,该算法对视频质量和码率的影响较小,并且能对认证通过的视频数据进行还原和对认证失败的视频Ⅰ帧遭篡改区域进行有效的定位。 相似文献
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