Video watermarking scheme based on IDR frames using MPEG-2 structure

摘要

A robust, imperceptible and blind video watermarking scheme based on MPEG-2 is presented. The proposed algorithm using the DC coefficients from 8 × 8 block of discrete coefficient transform generated by picking candidate IDR frames based on column transposition method in order to embed the scrambled binary watermark. The watermark can only be extracted by using the secret keys, enhances the security of watermark. The robustness is evaluated by testing against spatial synchronisation attacks, temporal synchronisation attacks and re-encoding attacks by evaluating two parameters as normalised correlation and bit error rate in order to find the degree of similarity and degree of dissimilarity respectively between the original and extracted watermark. The superiority of the proposed algorithm is that the excellent robustness achieved against temporal synchronisation attacks and compression attack by comparing it with previous work and also good perceptibility obtained without changing the motion vectors during the DPCM process of MPEG-2 encoding scheme.