关键词: 数字水印 水印攻击 几何攻击 同步

Abstract:

Although we have made great progress in the research of robust watermarking techniques, how to resist the geometric attacks is one of the most difficulties in the watermarking field. So the research of watermarking techniques against geometric attacks has now become a focus, And many algorithms are pr  oposed, which fall into two classes： the first and second generation watermarking schemes, In this paper the current methods against geometric attacks   are surveyed and analyzed, and the advantages and disadvantages of each class are summarized, and some probable development directions are presented.

Key words: digital watermarking, watermark attackl geometric attack, synchronization