Video Watermarking Algorithm Based DC Coefficient

After deeply analyzing the standard of MPEG2 video encoding formats, proposing a MPEG2 video watermarking technology based DC coefficient. The binary image is treated as watermarking information after being dealt with the mixed method of Logistic chaotic map and error correction coding. Unlike the traditional watermarking algorithm, it is not necessary to decode all the video data, and to do inverse Discrete Cosine Transformation (IDCT) after inverse quantization, and then to do Discrete Cosine Transform (DCT) after embed watermark. However in this paper, in the purpose of rapidly and efficiently embed watermark, to extract the compressed video in the MPEG2 transport stream, and decode the I-frame video data of the luminance component of the last macro block of the each of slice, and then modify the last DC coefficient directly to embed watermark according to watermark information. The results show that this watermarking algorithm of compressed MPEG2 video based on satisfy the general requirements for embedding capacity, not only has strong robustness but also has a good invisibility.