A pixel-based fragile image watermarking method based on s absolute moment block truncation coding (AMBTC) is proposed in this paper. To enhance the readability of the tampered image, we apply pixel concept to design pixel-based tampering detection and content recovery mechanisms. In the proposed scheme, recovery information is derived from the AMBTC compression codes of the original image, and authentication codes are generated by a pseudo random generator (PRG). Both data are then discretely embedded into the two least significant bits (LSBs) of pixels in the original image with turtle shell-based data hiding method. Therefore, each non-overlapped pixel pair in a watermarked image has 2 bits of recovery information and 2 bits of authentication code. When the recipient suspects that the received image may have been tampered with, the hidden authentication code can be used to locate tampered pixels, and then the hidden recovery information can be extracted and then used to restore the tampered pixels.

该文提出了一种基于绝对矩块截断编码(AMBTC)的基于像素的脆弱图像水印方法。为了提高篡改图像的可读性，我们应用像素概念来设计基于像素的篡改检测和内容恢复机制。在所提出的方案中，恢复信息是从原始图像的 AMBTC 压缩码中导出的，认证码是由伪随机发生器 (PRG) 生成的。然后使用基于龟壳的数据隐藏方法将两个数据离散地嵌入到原始图像中像素的两个最低有效位 (LSB) 中。因此，水印图像中的每个非重叠像素对都有2位恢复信息和2位认证码。当接收方怀疑接收到的图像可能被篡改时，