A Novel VQ-Based Watermarking Scheme with Genetic Codebook Partition
A Novel VQ-Based Watermarking Scheme with Genetic Codebook Partition
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发表时间：
2003
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通讯作者：
Feng-Hsing Wang;L. Jain;Jeng-Shyang Pan
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作者：
Feng-Hsing Wang;L. Jain;Jeng-Shyang Pan
提出了一种基于矢量量化（VQ）的数字静止图像水印方案。该方案首先将原始码本划分为两个子码本。为实现这一目标，提出了两个策略。第一种方法不需要复杂的算法，给用户完全的分区自由。第二种方法是遗传码本分割方法，该方法能够提高所提出的水印方案的性能。然后，将码本分割信息作为密钥用于所提出的水印方案中。在嵌入过程中，根据要嵌入的水印位选择子码本。然后执行传统的VQ最近码字搜索以获得输入向量的最近码字。在提取过程中，执行传统的VQ表查找过程。对于相同的密钥，可以通过检查对应码字属于哪个相同码本来确定隐藏的水印位。结果表明，该水印方案对水印图像具有更好的质量、对一些常见攻击具有更强的鲁棒性、更快的编码速度和有效的码本分割方法。
A novel watermarking scheme based on vector quantisation (VQ) for digital still images is presented. This scheme begins with the procedure of partitioning the original codebook into two sub-codebooks. To achieve this, two strategies are proposed. The first one requires no complex algorithm and gives the users full freedom for partitioning. The second one is a genetic codebook partition procedure, which has the ability to improve the perfonmance of tile proposed watermarking scheme. After that, the information of codebook partition is served as a secret key and is used in the proposed watermarking scheme. In the embedding procedure, according to the watermark bit to be embedded a sub-codebook is chosen. The traditional VQ nearest codeword search is then performed to obtain the nearest codeword for the input vector. In the extracting procedure, the traditional VQ table lookup procedure is executed. With the same secret key, the hidden watermark bit can be determined by examining which same-codebook the corresponding codeword is belonging to. It is denaonstated that the proposed watermarking scheme provides better quality in watermarked images, stronger robustness under some common attacks, faster encoding time, and effective methods for partitioning codebooks.