DIGITAL VIDEO WATERMARKING

Abstract

The paper proposes the DEW watermarking algorithm for copyright protection of MPEG streams. The solution to copyright protection of media content is based on embedding digital watermarks. This paper reviews different watermarking methods using discrete cosine transform (DCT). The DEW algorithm embeds label bits by selectively discarding high frequency DCT coefficients in certain image regions. Metrics for which DEW method is most effective are defined. The performance of the proposed watermarking algorithm is evaluated by the robustness of the watermark, the size of the watermark, and the visual degradation the watermark introduces. These performance factors are controlled by three parameters, namely the energy difference, the number of DCT blocks used to embed a single watermark bit, and the lowest DCT coefficient that we permit to be discarded. The watermark was subject to wide range of attacks: re-encoding, cutting, re-labeling, changing of bit-rate. The resulting model can be used for video copyright protection.

Keywords

• digital watermarks
• video
• embedding information
• dew