基于离散小波变换和离散余弦变换的彩色图像水印算法

Color Image Watermarking Algorithm Based on Discrete Wavelet Transform and Discrete Cosine Transform

摘要: 提出一种离散小波变换和离散余弦变换相结合的水印算法。首先，为提高水印信息的安全，将彩色水印图像二值化，再使用Arnold置乱；然后，将彩色载体图像转换到YCbCr色彩空间，对Y通道进行离散小波变换(DWT)，将低频信息分成8 * 8块，分别采用离散余弦变换(DCT)；最后，将加密的水印嵌入到每个DCT变换的低频信息中。仿真实验表明，算法具有较强的鲁棒性、较高的安全性及较好的简洁性。

Abstract: A watermarking algorithm based on the discrete wavelet transform and discrete cosine transform was proposed. First, in order to improve the security information of watermark, color watermark image is binarized, and Arnold is used to scramble. Then, the carrier image was converted to the YCbCr color space, and the Y channel was transformed by discrete wavelet transform (DWT). The low-frequency information was divided into 8 * 8 blocks using discrete cosine transform (DCT). Finally, the encrypted watermark is embedded into the low-frequency information of each DCT transform block. The simulation experiment showed that the algorithm has strong robustness, high security and good simplicity.