摘要
提出了一种用于图像认证的小波域半盲脆弱水印算法。水印由二值伪随机序列组成,嵌入在小波域细节分量的感知重要系数中。采用自适应量化中间值系数的方法嵌入水印。基于整数小波变换,并对量化算法进行改进以避免舍入误差。水印提取时不需要原始图像。实验结果表明,算法具有较好的不可见性,且对一定强度的图像压缩、增强等处理有鲁棒性;对于模糊、加噪等攻击表现出较强的脆弱性;对剪切等攻击有较好的篡改定位能力。
A semi-blind fragile watermarking algorithm for image authentication is introduced in this paper.The watermark is composed of binary sequence and is embedded into the perceptually important coefficients in the high frequency by adaptively quantizing the median value.Based on integer wavelet transform, the quantization algorithm is improved to avoid rounding errors.The watermark can be extracted without resorting to the original host image.Experimental results show that the proposed watermarking scheme is invisible and is robust against common image processing such as JPEG compression and image enhancement.The algorithm is fragile to content modification such as blurring and adding noise and can effectively detect the tampered regions for cropping.
出处
《测绘科学》
CSCD
北大核心
2008年第1期83-84,61,共3页
Science of Surveying and Mapping
关键词
整数小波变换
数字水印
图像认证
integer wavelet transform
digital watermarking
image authentication
