Classification model and enhancement of robustness in video digital watermark

Analyzing the characteristics of video digital watermark, we propose that robustness should be classified as inter-frame robustness and intra-frame robustness, and the former is more important than the latter. This classification model is a theoretical truss for designing high robust video digital watermark algorithms. Enhancement of robustness can be done according to this classification model. It is valuable in theory and practice. At last, a new video digital watermark algorithm is proposed with high robustness based on embedding and extracting of random frames, which proves this model.