Watermarking Algorithm Based on Frequency Hopping Technique for Image

To deal with the problem of digital products copyright protection,an effective blind watermarking algorithm based on the wavelet transform and frequency hopping is proposed.By means of the frequency hopping technique,hopping of the embedding positions from band to band according to the secret key will enhance the randomicity and security.Experimental results show that the algorithm has a good robustness against noise,normal image processing,image compression and malicious attacks.