An Effective Reversible Watermarking for 2D CAD Engineering Graphics Based on Improved QIM
An Effective Reversible Watermarking for 2D CAD Engineering Graphics Based on Improved QIM
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DOI：
10.4018/jdcf.2011010104
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Fei Peng;Yu-Zhou Lei
中科院分区：
文献类型：
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作者：
Fei Peng;Yu-Zhou Lei
量化索引调制（QIM）被广泛应用于数字水印中，但由于其固有的局限性，QIM不能直接应用于可逆水印。本文对QIM算法进行了改进，使其适用于可逆水印。基于改进的QIM（IQIM）算法，提出了一种二维CAD工程图可逆水印算法。该算法利用实体顶点的相对幅度和相对相位作为载体来携带水印，并通过密钥控制数据恢复。实验结果表明，该方案能够在容量、不可感知性、鲁棒性、安全性和复杂度之间取得较好的平衡。
Quantization index modulation (QIM) is widely used in watermarking, but QIM cannot be applied to reversible watermarking directly due to its inherent limitations. In this paper, an improvement is made to QIM to make it suitable for reversible watermarking. Based on the improved QIM (IQIM), a reversible watermarking scheme for 2D CAD engineering graphics is proposed. The relative amplitudes and the relative phases of entity vertices are used as hosts to carry the watermark, respectively, and the data recovery is controlled by a secret key. Experimental results indicate that the proposed scheme can strike a good balance between capacity, imperceptibility, robustness, security and complexity.