一种自适应的同步音频水印算法

针对Garcia水印算法1]所存在的不足，提出一种改进的自适应同步音频水印算法。算法具有以下特点:(1)应用声学模型,利用载体掩蔽阈值选择嵌入位置,以保证水印的隐藏性;(2)在时域嵌入同步码以抵制可能受到的同步攻击;(3)将音频载体进行分段,在每段音频自适应嵌入水印,并在每个段首嵌入段号以区别不同音频段;(4)利用数据冗余性,重复嵌入多份水印以提高水印提取的成功率。实验结果表明,水印具有较好的隐藏性、鲁棒性和抗同步性。

A Self-adaptive Synchronous Audio Watermarking Scheme

Against to existing deficiencies of Garcia’s watermarking scheme,an improved self-adaptive audio watermarking scheme with synchronization is proposed. The features of this scheme are:(1)The imbedding positions are determined according to psychoacoustic model in order to satisfy imperceptible; (2) Synchronous codes are imbedded into audio signal in time domain so as to withstand the possible synchronous attacks; (3) To segment audio signal firstly, watermarking is re-adaptively embedded into each segment, and the sequence of segment is imbedded into the front of every segment to discriminate different segments; (4) Using the redundance of audio, reduplicate watermarking signals are imbedded into audio so as to improve the successive probability. Experimental results show the algorithm is imperceptible,robust and good resistant to synchronization attacks.