基于人眼视觉系统的自适应量化数字水印算法研究

New Color Image Watermarking Based on Adaptive Quantization

提出了一种将彩色水印图像嵌入到原始彩色载体图像中的新算法.首先,利用DCT静态图像压缩技术,将彩色水印图像编码成一维二进制序列并进行随机置乱;然后将原始彩色载体图像分解为R、G、B三个彩色分量并分别实施小波变换,进而结合视觉感知特性自适应确定水印嵌入位置;最后结合人眼视觉系统(掩蔽特性及对颜色的感知特性)确定量化间隔,并通过全新的量化处理过程完成水印信息的自适应嵌入.仿真实验表明:该数字水印嵌入方案不仅具有较好的透明性,而且对诸如叠加噪声、JPEG压缩、平滑滤波、几何剪切、图像增强、马赛克效果等攻击均具有较好的鲁棒性.

A new color image watermarking algorithm based on adaptive quantization is proposed in this paper, in which a meaningful color image can he embedded into color digital image. First, the color digital watermark is converted into binary sequence by still image compression and permutation. Second, the color components （R,G,B） are performed by discrete wavelet decomposition, and the embedded location is identified according to HVS. Finally, the binary sequence is embedded into color components （R,G,B） in the DWT domain by using the technique of adaptive quantization. Experimental results show that the proposed watermarking scheme is invisible and robust against various signal processing such as cropping, compression, filtering, noise adding, image enhancement, and mosaic.