Digital Image Watermarking Algorithm

Digital watermarking has been a rising network information security technology. With the rapid development in recent years, it has become a popular topic in network security domain. And it hold wide application prospect in several domains, for example copyright protection, information hiding and etc.At first, this paper introduced watermark technology synoptically. It summarize the algorithm model and attack means of the watermark and generalized the existing picture watermark algorithm. Then we put forward a kind of improved digital watermark algorithm based on chaos array according to the shelter character of luminance and texture of the human visual system. Then we use lifting scheme improve wavelet analysis methods and proposed a kind of digital watermark algorithm based on error-correcting coded which is a method of communication theory and is to correct watermark signal. At last, we utilize the some characteristic of the picture and put forward a kind of the second generation watermark algorithm based on noise visibility function. The above three algorithms all show robust and dependability.