【摘要】 为了提高基于小波变换的图像数字水印算法抵御缩放等攻击的能力,提出了一种基于整数小波变换的图像盲数字水印算法。采用的整数小波变换利用了小波的多分辨分析特性能有效地匹配人类视觉系统模型的特点,更好地兼顾了水印透明性与鲁棒性之间的矛盾;算法中将嵌入的水印作为二值图像进行处理和隐藏,增强了水印所含信息的丰富性和直观性;多个水印副本的嵌入提高了图像抵御攻击的能力;数学形态学中的腐蚀与膨胀运算的运用提高了提取出水印的可辨识度。经过实验证明该算法具有较好的鲁棒性及实用性。更多还原

【Abstract】 In order to improve the ability of attack resistance(e.g.zoom,etc.) in watermark algorithms based on wavelet transform,a blind digital watermark algorithm based on integer wavelet transform for images is proposed.The integer wavelet transform has the characteristic of multi-resolution analysis which can match the HVS efficiently,so it can balance the contradiction between transparency and robustness of digital watermark very well.In the algorithm proposed,the embedded watermark is processed and hidden by the way of binary images,which makes the watermark information more rich and intuitive.More than one watermark copies improve the ability of attack resistance.Erosion and dilation operation in morphology is used to improve the recognition level of the recovered watermark.The experiment results demonstrate the better resistance,robustness and practicability.更多还原