A Block Based Novel Digital Video Watermarking Scheme Using Dct

Abstract

The rapid growth of network distributions of images and video, there is a need for copyright protection against piracy. For this purpose we are using video watermarking (VM). Different digital watermarking schemes have been proposed to address this issue of ownership identification. Digital watermarking is a process by which user specified signal(Watermark) is hidden or embedded into another signal(Video Signal) by the watermark embedding process. Afterwards the recovery of the watermark is achieved with the help of the watermark extraction process. The video watermark is robust against the attack of frame dropping, averaging and statistical analysis. It leads to broad curiosity in multimedia security and multimedia copyright protection. The most important issue in VM are the invisibility of the watermark and the resilience of watermarking to attacks.Watermarking techniques are classified into three categories. They are Spatial Domain Method(SDM), Transform Domain Method(TDM) and Compressed Domain Method(CDM). Here explained about to transform domain method. This method used the discrete cosine transform(DCT), Discrete Fourier Transform(DFT) and Discrete Wavelet Transform(DWT) for watermark embedding.DWT are more popularity due to their spatial localization, frequency spread etc.. But DCT watermarking was to human perception model to modify low coefficients of DCT blocks.It has a larger embedding capacity and robustness. This technique provides better results with high accuracy.