Edit Detection System by Digital Watermarking of Video Contents Characteristic Information Based on Digital Signature

摘要

In this paper, a video edit detection system is proposed for the purpose of detection of illegally edited video. Our method is based on the concept of digital signature that can prove the message's integrity by attaching a digest that is generated from the message itself. In our system, a message of digital signature mechanism corresponds to a video content, so does a digest to so-called VFI(Video Fingerprint Information), that describes characteristics of video content. VFI is embedded over the content by digital watermark techniques. The edit detection, or content integrity, is confirmed by comparing embedded VFI and newly extracted VFI'. After implementing our proposal using both VFI of average value of Y, Cb, Cr per frame and a watermarking method of DCT coefficient manipulation, some simulation experiments are executed to investigate its characteristics. From the results, embedded watermark (VFI) is extracted after MPEG recompression and video editing(frame cut) was successfully detected and our system's basic applicability is confirmed.