Digital video watermarking based on dither modulation

A video authentication technique for security and copyright protection based on Discrete Cosine Transform (DCT) and Dither Modulation (DM) is discussed in this paper. Video watermarking embeds a permanent message signal in the video frames in order to secure the video from unauthorized reproducing. The presented watermarking algorithm works in frequency domain utilizing the concept of Dither Modulation (DM) which is basically an implementation of Quantization Index Modulation (QIM). The binary watermark is transformed into its bit planes. The first four Most Significant Bit planes are extracted and embedded into video frames. Blind watermark extraction is adopted using Inverse QIM and Minimum Distance Decoder. The proposed algorithm is evaluated for robustness and various attacks like JPEG compression, noising, luminance modification, filtering and rotation.