A krawtchouk moment based video watermarking scheme
Leida Li · Journal of Optoelectronics·laser · 2008
A new video watermarking scheme is presented based on Krawtchouk moments(KVW).The ′localness′ property of Krawtchouk moments(KMs) permits the watermark to be inserted locally at a certain object region selected by the user.KVW first computes KMs of I frame and the adjacent P frame after selecting the same most significant object region.The robustness to the cropping of lower KMs and high similarity between video frames are combined to select an optimal moment set.The moments in the optimal moment set are modified according to the random watermark bits.The difference vector is reconstructed and added to I frame in spatial domain to obtain the watermarked I frame.In detection,the KMs of the possibly attacked I frame are computed.And the KMs of original I frame are substitued by the adjacent KMs of P frame selected in the optimal moment set as the key to extract watermark bits.Extensive simulation results show that KVW achieves good image quality and it is robust to frame cropping and common signal processing attacks.