A DWT-based Digital Video Watermarking Scheme with Error Cor(2)

Abstract. In this paper, a digital video watermarking algorithm is proposed. We present a novel DWT-based blind digital video watermarking scheme with scrambled watermark and error correcting code. Our scheme embeds different parts of a single watermark in

algorithms do not solve these problems effectively. In our scheme, we attack this problem by applying scene change detections and scrambled watermarks in a video. The scheme is robust against frame dropping, as the same part of the watermark is embedded into the frames of a scene. For different scenes, different parts of the watermark are used, making the scheme robust against frame averaging and statistical analysis. At the same time, an audio watermark is included to enhance the robustness of the scheme. Error correcting code of a video watermark can be embedded as an audio watermark and used for refining the embedded watermark during detection. Our approach cultivates an innovative idea in embedding different parts of a watermark according to scene changes, and in embedding its error correcting code as an audio watermark. Although the concept is quite simple, this approach is never explored in the literature, and its advantages are clear and significant. The effectiveness of this scheme is verified through a number of experiments.

This paper is organized into four sections. The next section presents the details of the novel video watermark scheme and the experimental results are shown in Section

3. Section 4 provides a conclusion and the further improvement of this scheme.

2. A Video Watermarking Scheme

The new watermarking scheme we propose is based on Discrete Wavelet Transform. Fig. 1 shows an overview of our watermarking process. In our scheme, an input video is split into audio and video stream and undergoes watermarking respectively. On the other hand, a watermark is decomposed into different parts which are embedded in

corresponding frames of different scenes in the original video.

Fig. 1. Overview of the watermarking process

As applying a fixed image watermark to each frame in the video leads to the problems in maintaining statistical and perceptual invisibility [7], our scheme employs independent watermarks for successive but different scenes. Applying