基于信息隐藏的监控图像防篡改方法

Forensic method for monitored image based on information hiding

针对当前监控图像可能被恶意篡改的问题,提出了一种基于信息隐藏的监控图像保存及防篡改方法。首先,通过信息隐藏的手段,将监控图像的来源传感器及摄取时间信息进行隐藏,给出了一种基于信息隐藏的监控图像及现场信息保存的大致流程。然后,采用信息隐藏中典型的最低有效比特位(LSB)替换隐藏算法,给出了现场信息的随机嵌入和提取算法。最后,实验分析结果表明,在图像质量得到较好保持的情况下,所提方法能够实现现场信息的有效嵌入和提取,验证了所提方法的可行性和有效性。

For the problem that the monitored images may be altered illegally by some persons, a method to protect the monitored images and forensic information was proposed based on the technique of information hiding. Firstly, by hiding the series number of the source sensor and monitoring time of the monitored image, the simple flow was presented based on information hiding to restore the monitored image and forensic information. Then, using the typical Least Significant Bit （ LSB） substitution algorithm, the algorithms to embed and extract forensic information were presented in detail. At last, the experimental results show that, the proposed method could successfully embed and extract the forensic information while preserving the image quality almost perfectly, which verifies the practicability and efficiency of the proposed method.