Image Watermarking Method Based On Lifting Scheme Wavelet Research

Watermarking as one of the most important branchs of information hidingis, is a foreland problem, and it is important in digita works' copy protection and multimedia integrity authentication. Watermarking involves information theory, image processsing and net security knowledge, which is of great academic value and economic value.This paper mainly investigates how to design robust imgae watermarking for copyright and semi-fragile watermarking and fragile watermarking for image authentication. Firstly, it describes basic conception, character and various kinds of digital watermarking, then presents three novel schemes of based lift-wavelet transform , a robust watermarking . a semi-fragile watermarking and a fragile watermarking.The first scheme is proposes a robust image watermarking algorithm for copyright protection. According to the imge texture character, the scheme combines the qualities of lifting scheme wavelet and wavelet block and embedds gray watermarking self-adaptively in the coefficient. The algorithm has very strong robustness for some common image processing operations.The second scheme is proposes a self-adaptive semi-fragile watermarking mehtod based on image authentication. The algorithm self-adaptively embeds watermarking in the lift wavelet domain according to the characters of the wavelet coefficients, which is a good applied semi-frageile watermarking.The third scheme is proposes a fragile watermarking algorithm based on image authentication. Adopting the sensitivity the of chaos system, the algorithm introduces non-deterministic block-wise in interger wavelet domain. Involving wavelet transform and the neightbouring pixels, the algorithm improves tamper detection and the localization resolution.