Research on Blind Watermarking Embedding Algorithm with Replacing Middle Frequency Coefficients in DCT Domain
置换DCT域中频系数的盲水印嵌入算法研究*

This paper proposed a blind watermarking algorithm based on replacing the middle frequency coefficients in DCT domain,and researched the self-adaptive embedding method of digital watermarking by employing the algorithm.This algorithm pierced into the traditional watermarking embedding algorithms,such as additive algorithm and multiplicative algorithm,which solved the problem that the detection accuracy becomes lower because the DCT coefficients of the original image exist in the extracted watermark.Moreover,the watermark was self-adaptively embedded in image using HVS,and the embedded digital watermarking is not inverse radically.The experiments prove the strong robustness against the attacks such as filtering,cropping and adding noise.