【摘要】 结合多小波变换与离散余弦变换技术和分形技术,利用图像的视觉特征向量,提出并实现了一种新的鲁棒的图像水印算法。首先,对图像进行多小波变换;然后,结合水印序列,对中低频系数进行分形编解码;接着,对解码后生成低频系数进行DCT变换;最后,提取其视觉特征向量,与水印共同生成水印提取密钥,完成水印的嵌入。实验结果说明本文提出的算法在JPEG压缩、滤波、噪声、旋转,缩放,弯曲等方面比同类算法有更好的鲁棒性。更多还原

【Abstract】 A new robust image watermarking algorithm of combining multi-wavelet transform and discrete cosine transform and fractal techniques, using the visual feature vector of images, is proposed and implemented. First, multi-image wavelet transform is finished; and then, combined with the watermark sequence is, the low-frequency coefficients are fractally coded and encoded; Moreover, decoded to the DCT-generated low-frequency coefficients; Finally, the extraction of visual feature vector, together with the watermark is generated watermark extracting the key to complete the watermark embedding. Experiments show: the Method in the JPEG compression, filtering, noise and the geometric deformation, such as the rotation, scaling, bending etc. have a good robustness.更多还原