摘要
随着多媒体数据的广泛使用,其内容的真实性和完整性越来越受到人们的关注,基于内容的多媒体数据鉴别技术成为了一个重要的热点研究领域。根据静态图像的特征,提出了一个用于数字图像的、块对独立的鉴别方法。提取JPEG 压缩不变量作为特征,并引入参考块来辅助篡改定位。实验证明,它可以在一定程度上容忍JPEG 压缩,对篡改操作敏感,并可以在8*8 像素块的量级上对篡改区域进行精确定位。
With wide use of multimedia data, its content-based authenticity and integrity are more and more concerned,content-based multimedia data authentication technique becomes an important research hotspot. According to characteristics of still images, a block- pair independent authentication algorithm is proposed. Authentication algorithm extracts invariants of an image before and after JPEG compression and takes them as feature codes. Furthermore, and it introduces reference block to help tamper localizing. Experiments show that this authentication algorithm can tolerate JPEG lossy compression to a certain extent, while it is sensitive to malicious tampers. And those blocks detected as manipulated can be localized accurately at 8*8 pixel block level.
出处
《计算机工程与设计》
CSCD
北大核心
2005年第3期798-800,共3页
Computer Engineering and Design
