Error detection by digital watermarking for MPEG-4 video coding
This paper describes a new approach to the digital watermarking of motion pictures dedicatedly for the MPEG-4 video coding, which intends to enhance the error detection ability. The conventional method lacks not only the detection ability but also the compatibility with video decoders widely used today. Thus in this approach the digital watermarks are to be embedded into the quantized DCT (Discrete Cosine Transform) coefficients for the error detection, where the prevention of the picture quality degradation is also attempted. Experimental results are shown to demonstrate that the error detection ability of the proposed approach is significantly improved, as compared with that of the conventional method; and that the degradation of the picture quality by the watermarking is extremely small.
error detection digital watermarking mpeg-4 error resilience