一种用于认证二值文本图像窜改定位的数字水印算法

众多二值文本图像水印算法在嵌入水印时,都要对黑色像素进行变动,很容易引起图像失真,为解决此问题,提出一种新的水印算法,该算法按行列统计文本黑色像素信息并生成水印,将水印编码与差错控制码绑定,将文本分块,利用不可视黄点表征水印嵌入文本空白处。实验结果表明,嵌入水印后,图像效果良好,水印提取实现了盲提取,并具有完整性鉴定和窜改定位的功能。

Digital watermarking method for binary text images authentication and tamper localization

Numerous algorithms of binary text image watermarking in embedding watermark depend on shuffling the black pixels, which would easily lead to image distortion. To solve this problem, this paper proposed a novel watermarking method that relied on the imperceptibility of yellow dots on white paper. This method counted the black pixels information of binary text image in the form of rows and columns to generate the watermarks, and then binding these watermarks with the error control code. Meanwhile, it divided the original binary text into blocks, the watermarks described as imperceptible yellow dots were then embedded into the selected white pixel of each block. Experimental results show that the watermarked binary text images have fine quality and the watermarks can be extracted blindly, which can authenticate the binary text images and accurately localise the tampered areas.