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中文摘要：
提出了一种新的多功能彩色数字图像双水印算法。提取原始彩色图像的R、G、B3个色彩通道，在蓝色分量B的中频系数上嵌入扩频后的版权水印。再根据绿色分量G生成认证水印，嵌入在量化后的提升小波系数上，不需要考虑两种水印的嵌入顺序。实验表明。版权水印具有很好的抗剪切性，鲁棒性较强、透明性较好；认证水印可精确进行图像篡改检测和定位。
英文摘要：
A new muhifunctional double-watermarking algorithm of digital image was proposed. The original imagewas decomposed into R, G, B, three color components. Copyright watermark that modulated by sequence spread spectrumwas embedded in B component＇s intermediate frequency coefficients. Authentication watermark was embedded in lifting wavelet coefficients quantified, which was made by G component. The two kinds of watermark can be embedded at the same time or separately. The experimental results show that copyright watermark can well protect from shear transformation attack and it has good robustness and imperceptibility.The authentication watermark algorithm can realize tamper detection and location well.
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