基于YIQ色彩空间的彩色图像盲水印算法*

提出了一种将彩色图像作为数字水印嵌入到彩色宿主图像中的新算法，用于图像版权保护。将彩色水印图像进行一维数字化处理，并将彩色宿主图像由RGB色彩模式转换成YIQ色彩模式，采用整数小波变换将彩色水印嵌入到彩色图像YIQ色彩空间的Y分量中。彩色水印的提取不需要原始水印和原始宿主图像。实验表明：该数字水印算法不仅具有良好的透明性，而且对诸如叠加噪声、JPEG压缩、几何剪切、平滑滤波等攻击具有很强的鲁棒性。

Blind watermark algorithm for color image based on YIQ color space

This paper proposed a digital watermarking algorithm for color image watermark embedded to color host image based on YIQ color space to protect image copyright. Before embedding the watermark, processed color image that viewed as watermark into one dimension digital information and transformed the RGB space model of color host image to YIQ model. Then, according to the human visual system peculiarity and quantizing the wavelet coefficient, embedded encrypted watermark adaptively into the Y luminance component of the YIQ mode in IWT domain. The proposed algorithm allows extracting watermark without the help of original watermark and host image. Experiment results show that the proposed watermarking algorithm is invisible and robust against various signals processing such as noise adding, JPEG compression, geometric cropping, and smooth filtering etc.