Research On Digital Watermarking Algorithm Based On Chaos

The digital media has become a main way for information communication along with the wide use of network. This thesis is concerned with one of the most important branch of information hiding, the digital watermarking technology, with emphasis on its applications in digital images.Firstly, this Paper introduces background of research of digital watermarking technologies, describes the basic concepts and classification of digital watermarking, as well as application fields and development of digital watermarking, formulates the design principles and methods of digital watermarking , and analyses the performance of digital image watermarking algorithm. Then, based on the existing watermarking algorithms , two invisible image watermarking schemes based on chaotic in DCT transform domain are proposed, one is adaptive image digital watermarking algorithm based on chaotic sequence , the other is color image watermarking algorithm based on chaotic. Finally, the good performance of the two algorithms is verified by some common image processing and attack experiments.In this paper an improved algorithm in DCT domain based on chaotic sequence is proposed. Exploiting some characteristics of Human Visual System (HVS) and DC components having much larger perceptual capacity than any AC components, watermark is adaptive embedded into the DC components of the original image. The experimental results show that the watermarks are invisible...