Abstract
In recent years, H.264 is a new video compression technology. Its compression and the video quality exceed in the previous technology. H.264 high compression efficiency makes video can easily spread on the Internet so that the copyright issue will be considered an important topic for H.264. Here, we propose a method to embed the watermark into H.264/AVC. Due to the use of residual block coding of H.264, most of the blocks after quantization are all-zero blocks, These all-zero blocks is a high compression efficiency of a major culprit for H.264. Therefore, the main idea of this paper is to keep the existing video quality and the all-zero blocks. We change part of quantized DCT (discrete cosine transformation) coefficients to embed digital watermark. It will cause large effect for human vision to modify the low frequency so that we only modify to the middle-frequency domain and high-frequency domain.