基于QR分解和小波变换的彩色图像水印算法

Color Image Watermarking Algorithm Based on QR Decomposition and Wavelet Transformation

为了提高水印的鲁棒性和不可见性,该项研究提出一种新的基于高效QR分解和小波变换的彩色图像盲水印提高算法。首先,将彩色宿主图像转化到Lab颜色空间后,进行小波变换,将其低频分量分成4×4非重叠像素块,然后对每个4×4非重叠的像素块logistic置乱并对选中像素块进行QR分解,通过量化矩阵R的第1行相应的元素来嵌入水印信息。提取水印过程中,不需要原始图像和原水印图像,实现盲提取。实验结果表明,该算法具有良好的不可见性和鲁棒性,能够有效抵抗JPEG压缩、中值滤波、剪切、放大、旋转、椒盐噪声和高斯噪声等多种恶意攻击。

In order to improve the robustness and imperceptibility,a color image blind watermarking algorithm based on the efficient QR decomposition and wavelet transformation is proposed.Firstly,the color host image was transformed to into lab color space,then wavelet was transformed,the low frequency component was decomposed into 4x4 non overlapping blocks of pixels,then each 4x4 non overlapping blocks of pixels was disordered of logistic and the selected pixel block was performed to QR decomposition,watermark information was embedded,through the quantization matrix R of the first line of the corresponding element.In the process of extracting the watermark,no original image and original watermark image were needed,and the blind extraction was realized.The results show that the algorithm satisfies the watermark imperceptibility basic requirements and better robustness,which can resist attacks such as the JPEG compression,median filtering,shearing amplification rotation Salt and pepper noise and Gaussian noise.