一种灵敏的文本图像认证混沌脆弱水印技术

提出了一种适合二值文本图像产品认证、完整性证明和内容篡改证明的脆弱数字水印算法．文中定义了区域的最不重要像素块LSPB（Least Significant Pixel Block）概念，将一个区域中非嵌入水印点的像素值映射成混沌初值，经过混沌迭代生成水印信息，然后将水印比特嵌入到LSPB的中心像素．实验表明，嵌入水印后的二值图像视觉质量好。算法能够准确地检测并定位对含水印图像的篡改．是一种灵敏的完全盲水印方案．

Sensitive Chaotic Fragile Watermarking Technique for Binary Images Verification

A new fragile watermarking scheme is presented. Which is capable of authentication, tamper-proofing and integrity verification of binary text images. By defining concept of LSPB(Least Significant Pixel Block), let the values of non-watermarked pixels be mapped to the initial values of the chaotic mapping. The watermark, which obtained by iterating several times of the chaotic mapping, is embedded into the central pixel of LSPB. Experimental results demonstrate that, those watermarked binary images have good visual quality, the algorithm can detect and localize precisely the tampers on the watermarked image. It is a sensitive and complete blind watermark scheme.