H.264/AVC Video Watermarking Algorithm Against Requantization Transcoding
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摘要: 根据H.264/AVC特定的编解码架构,该文提出一种基于残差系数符号编码的新水印方案。在重量化转码分析的基础上,结合纹理复杂度和率失真开销差距选择嵌入水印的宏块,解决了重量化转码过程中宏块模式变化引起水印不同步问题。水印嵌入不是直接对系数进行叠加,而是结合DCT残差系数特点,通过特定的符号编码方式对系数进行轻微调制。实验结果表明,该算法可以抵抗重量化转码、加性白高斯噪声、亮度与对比度调节等攻击,并且能很好地保持视频感知质量。Abstract: According to H.264/AVC specific codec architecture, a novel watermarking algorithm with symbol encoding is proposed. Based on the analysis of requantization transcoding, the macroblock used for watermarking is selected with the combination of texture complexity and rate-distortion cost. The problem of watermark synchronization between the sender and receiver can be solved. The watermark information is embedded by slight modulating the coefficients with specific symbol encoding, instead of directly adding the watermark to the quantized coefficients. Experimental results reveal that the proposed scheme is robust against attacks such as requantization transcoding, additive white Gaussian noise, brightness and contrast adjustment, while preserving the perceptual quality.
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Key words:
- Video watermarking /
- H.264/AVC /
- Requantization transcoding /
- Symbol encoding
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