A Robust Video Watermarking Scheme to Scalable Recompression and Transcoding

In this paper, we present a simple but effective video watermarking scheme robust enough against scalable lossy recompression and transcoding. Most of video watermarking algorithms use DCT or DWT, but few of those method can withstand scalable recompression or transcoding. Algorithms with DWT and DCT usually based on specific encoding format, so the watermark will be lost after transform embedded video to other encoding formats. In our method, we use scene change to choose frames to embed watermark, so it can resist attack of aimless frame dropping. We use Arnold transformation to enhance the imperceptibility of the watermark. Our watermark is a fixed-size binary image, after Arnold transformation, it is uniformly embedded to the chosen frames by a spatial random mapping algorithm. The watermark after embedding to the frame has a high imperceptibility. The proposed algorithm allows blind detection without use of origin video. The embedded watermark can be extracted in a low resolution video recompressed from an embedded high resolution video or transcoded from other format embedded video.