打印扫描不变的多轮廓像素翻转文本图像水印算法

Print-scan Invariant Multi-contour Pixel Flipping Text Image Watermark Algorithm

基于打印扫描不变量,提出一种多轮廓像素翻转的文本图像水印算法,其中包含三个措施:提出一种水印压缩预处理方法,通过压缩水印信息,在总嵌入容量一定的情况下,增加水印嵌入的次数,从而提高水印鲁棒性;提出多轮廓像素翻转策略,降低水印错误嵌入的可能性,进一步提高水印鲁棒性;以打印扫描不变量为特征值,结合离散余弦变换和多轮廓像素翻转策略提出一种优化的双域结合的水印嵌入及提取算法,在保证水印不可见性的同时,提高水印抵抗打印扫描攻击的能力。实验表明,本文算法能够在保证水印不可见性的前提下,提高水印对打印扫描攻击的鲁棒性,同时也能够抵抗常见的图像攻击。

Based on the print-scan invariant,a multi-contour pixel flipped watermarking algorithm for text images was proposed,which contains three measures as follows.First,a watermark compression preprocessing method was proposed.By compressing watermarking information,the number of times of watermark embedding is increased under the condition of a certain total embedding capacity,so as to improve the robustness of the watermark.Second,a multi-contour pixel flipping strategy was proposed,which can reduce the possibility of false embedding of the watermark,and further improve watermark robustness.Finally,characterized by print-scan invariant,combined with discrete cosine transform and multi-contour pixel flipping strategy,an optimized dual-domain combined watermark embedding and extraction algorithm was proposed to improve the ability of the watermark to resist print-scan attack while ensuring the invisibility of the watermark.Experiments show that the proposed algorithm can improve the robustness of the watermark against print-scan attack while ensuring the invisibility of the watermark,and it can also resist common image attacks.