关键词: 数字水印, 脆弱, 图像认证, 拼贴攻击, 篡改定位

Abstract:

This paper proposes a new watermark algorithm based on the chaotic sequence to solve the security problems of Yeung-Mintzer algorithm and it has a significant improvement on the image invisibility and the tamper detection rate, while retains the other advantages. The method is intended for use in image verification applications, where one is interested in knowing whether and where the content of an image is altered maliciously. Theoretical analysis and experimental results prove that this algorithm has a great practicability and can be used for legal evidence image and medical image.

Key words: digital watermark, fragile, image authentication, collage attack, tamper localization