抗解压缩压缩攻击的MP3压缩域音频水印.pdfVIP

Vol. 14 No.4 第 14 番第4 期 上梅大学学报(自然科学版) 2仪)8 年8 OF SHANGHAJ UNIVERSITY 2∞8 文章编寄:1 ∞小2861 (2∞8 )04 -0331 -05 抗解压缩/压缩攻击的 MP3 压缩域音频水印 朱奎龙， 侠丽敏 (上海大学通信与信息工程学院，上海 2α)(}72) 摘要:充分结合M凹的编码特性，提出一种M附压缩域的音频水印辑:法米对 M凹音乐进行版权保护.在M凹压缩 过程中.通过寻求 m 个能鼓较大的比例因子赖带，然后分别修改每个频带中最大修正的离散余弦变换(m阳lifi刷i discrete cosine transform ,MDCT) 系数的符号来服行水印的嵌入.在 MP3解问过科中对水印信号进行提椒，提取不需 要原始就体.嵌入过程和l 编制过程[fiJ 步完成，削提取过和相解闹过程亦是|叶步完成.实验证明，该算法具有很好的 昕觉透明性和1~姆的鲁棒性，可以有效地抵抗攻击者对比特流解码珩同理新!五缩的攻击. 关键词: MP3;音频7}(印;版权保护;比例刷子频带;修正的离散余弦变换系散 中回分类号: TP 391 文献标恋码:A MP3 Compression Based 飞~atermarking Capable of Resisting DecodinglR• coding Attack ZH lJ Kui唰long ， HOU Li哨lIn (School of Communication and Information Engineering , Shanghai Univer将ity. Shanghai 2仪XJ72 ， China) Abstract: This paper proposes a new scheme of audio watermarkíng based on M阳 compre捕ion for protecting copyright of MP3 music. During M阳 encoding ， energy of each scale band is computed to get m scale bands having relatively high energy. The lar事est modified discrete cosine transform (MDCT) coefficient is found in each scale band. The watermark bits are embedded by modifying the sign of the回 coefficients. The watermark can be extracted in the decoding process without using the original audio signal. The presence of watermark ís undetectable by human heari吨， and the scheme is robust against attack which is performed by decoding the watermarked MP3 bít stream and then re-coding it. Key words: MP3;