The semi-fragile digital watermark embedding algorithm based on second-generation wavelet

This paper puts forward a semi-fragile watermarking embedding algorithm based on HVS and the relativity of the second generation wavelet coefficients. The embedding algorithm chooses low frequency coefficients as embedding region, groups low frequency coefficients and embeds watermark into the average of each group. Embedding algorithm sets strength factor, combining with the JND value to quantify the average and control embedding strength. Before embedding watermark, the paper encrypts watermark to ensure it´s security and enhance invisibility and robustness of it. According to the Matlab test, the embedding algorithm of this paper possesses high stability, allows high embedding strength, and the embedded watermark has favorable robustness and fragility.