Video watermarking by 3D DCT

The algorithm of three dimensional discrete cosine transform is used in video compression, which takes advantage of statistical behavior of video data both in spatial and temporal domains. The method presented here is based on the three dimensional discrete cosine transform of video scene, in contrast with previous works on video watermarking where each video frame was marked separately, or where only intra-frame or motion compensation parameters were marked in MPEG compressed videos. The watermark sequence used is encrypted, pseudo-noise signal to the video. The performance of the presented technique is evaluated experimentally.