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中文摘要：
提出了一种安全性高的DWT（discrete wavelet transform）域鲁棒性扩频水印算法。该算法用Arnold变换对水印置乱，而后基于复合混沌二值序列对水印图案信号进行加密和扩频，并给出了一种小波域中量化步长的自适应确定方法，通过奇偶量化的方法将二值水印比特批量嵌入到载体的频域系数中。复合混沌密钥的使用与小波域系数修改的隐蔽性，增强了水印算法的安全性，基于混沌序列扩频码的扩频水印技术增强了水印的鲁棒性，同时很好地兼顾了水印的不可见性，并且实现了水印信息的盲提取。
英文摘要：
This paper put forward a robust spread spectrum algorithm with high safety in DWT（ discrete wavelet transform）domain. Permuted watermark by Arnold transformation, then encrypted and spread based on compound chaotic binary sequence. And presented a method of fixing quantization step adaptively in DWT domain. Embedded binary watermark bits in frequency domain through odd-even quantization. The use of compound chaotic keys and privacy of modification on coefficients of DWT domain enhanced the security of watermarking algorithm. Spread spectrum watermarking technology using chaotic sequence as spread-spectrum code improved the robustness of watermark. The imperceptibility and robustness were all took into consideration commendably, and realized blind extraction of watermark.
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