Audio watermarking based on MPEG-2 AAC
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摘要: 提出了一種針對MPEG-2 AAC壓縮音頻的脆弱水印算法.該算法利用了AAC中MDCT量化系數大于15的Huffman編碼特性來嵌入水印,并依據水印的頻率分布和音頻信號感知熵PE的大小對嵌入算法進行了分析和改進.實驗表明,該算法具有較高隱藏率和良好的不可感知性,并且水印的嵌入和提取過程十分方便快速,適合進行實時分析.Abstract: A fragile audio watermarking method for MPEG-2 AAC bitstreams was proposed. The algorithm of watermark embedding was carried out by modifying the LSBs (least significant bits) of quantized MDCT coefficient's magnitude that is greater than 15, and was improved by considering the watermark's distribution in frequency and the perceptual entropy of host audio. Experimental result shows the proposed watermarking scheme is not appreciable, and it is possible to insert high hide rate additive data effectively into encoded bitstreams. The embedding and retrieving process is easy and it is adaptive for real-time analysis applications.
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Key words:
- bitstream watermark /
- AAC /
- compression /
- Huffman coding
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