基于压缩特征的数字图像篡改取证研究

Research on Tampering Forensics Digital Image Based on Compression Feature

随着计算机网络和多媒体技术的迅速发展,数字图像的恶意篡改和伪造也越来越容易,判断图像真实性和完整性显得尤为重要.对最流行的JPEG图像进行研究,图像篡改操作会破坏、打乱图像数据之间彼此关联性和内在连续性,通过图像压缩特征的差值曲线发现:单次压缩后图像的差值曲线只有一个波谷,而双重JPEG压缩图像的差值曲线有两个波谷,因此可以根据图像的差值曲线来检测图像是否被篡改.

With the rapid development of computer network and multimedia technology, the digital image forgery tampering and also more and more easily, to judge the authenticity and integrity of the image is very important. The research of image in JPEG format is currently the most popular, because the image tampering operation will destroy, disrupt the image data between the relevance and the inherent continuity, found by the difference curve of image compression features： a single compressed image difference curve is only one wave valley, and double JPEG compression curve of the difference image two trough, so it can be judged according to the difference curve of image to the image has been tampered with.