一种结合小波域和空域的图像数字水印新算法

提出了一种结合小波域和空域的图像数字水印新算法。依据重要性将原始水印分成两部分,分别嵌入载体图像小波域和空域。并利用混沌系统对水印序列的嵌入位置进行置乱。重要水印嵌入小波域多级分解的低频子图;采用二值量化算法。其余水印嵌入载体空域非LSB的中间比特位;并采用最小化像素改变策略。实验结果证明了该算法在提高水印容量的同时,嵌入水印也具有很好的安全性、隐蔽性和鲁棒性。

A Novel Image Digital Watermarking Algorithm Combining DWT and Spatial Domain

A novel image digital watermarking algorithm combining DWT with spatial domain is proposed in this paper. According to data importance for DWT,the original watermark image is splitted into two parts which are inserted into spatial domain and wavelet domaim respectivly,and utilizing chaotic systems to scramble the watermarks embedding positions.The important data are embedded to the low frequency coefficients of deep wavelet domain using binary quantization algorithm.The rest are inserted in spatial domain instead of using LSB method,the watermarks are embedded to median bits of pixels,and the strategy of minimizing changes of host image pixels is adopted.Experimental results demonstrate that,not only the watermarking capacity is increased,but also the embedded watermarks are invisible,secure and robust.