A New Semi-fragile Watermarking Algorithm for Image Authentication
一种用于图像认证的半脆弱性数字水印算法

The watermark can be embedded or extracted by the mean quantization operation of the encrypted sequence constructed by the high frequency coefficients in the Harr wavelet transform domain, and the mean quantization parameters can be adjusted according to the sensitivity requirements. The experimental results demonstrate that the proposed algorithm has good perceptual transparence. The malicious modification can be distinguished from the common image processing such as brightness adjustment, linear filtering and so on, while the tampered area can be located exactly.