Multiple digital watermaking algorithm to protect digital images based on integer wavelet matrix norm quantization

With the development of computer technology, digital images' integrity and authenticity are queried more and more widely. As a protection and authentication technology, digital watermaking technology has been used in image field. In this paper, a multiple digital watermarking algorithm is proposed based on integer wavelet transform to protect digital images and estimate its integrity and authenticity. Using matrix norm quantization, it embeds watermarks into low frequency, medium frequency and high frequency detail subbands of images' integer wavelet domain and it is is a blind testing watermaking algorithm. Attacking experiments show that the algorithm not only has both robustness and sensitivity, but also exactly locates distorted area, so it is an effective multiple digital watermaking algorithm.