一种基于离散小波变换的数字图像认证算法

A Digital Watermarking of Image Authentication Algorithm Base on DWT

提出了一种基于离散小波变换的半脆弱水印认证算法。利用小波系数之间的相关性作为图像特征水印,利用小波系数块均值量化来嵌入,在鲁棒性和脆弱性方面达到很好的平衡。该算法能够识别图像的恶意篡改,并定位篡改发生区域,而对通常的图像处理具有一定的鲁棒性。

This paper presents a existing kind of semi-fragile watermarking authentication algorithm based on the DWT （Discrete Wavelet Transform）. The algorithm considers relations among wavelet coefficients as image features and the watermark that can protect the image content,thus the watermark bits imbed in the average value of the four adjacent wavelet coefficients with quantization since the average value has better stability than single wavelet coefficient. The algorithm is able to identify malicious changes, and can locate the tampered region. And it is very insensitive to the common image processing. In addition, it can stand against the collage attack.