Application Research On AVS Audio Digital Watermarking Based On Chaotic Key

With the development of the internet and multimedia, the protection for the intellectual copyright becomes more and more urgent and important, meanwhile, the digital watermarking is the effective means to slove the intellectual copyright problems. Recently, research on the still image watermarking technology becomes more and more matured; while the research on audio digital watermarking is becoming a hot topic.Audio digital watermarking embeds the watermark with certain algorithm, the watermark can be the pseudo random sequences, then detect and extract the watermark from the watermarked media. The chaotic sequence has some good characteristics, such as the randomness, the sensitiveness to the initial value and the control parameter, easiness to generate, thus, they are widely used in the field of the information hiding, communication system and encryption.This thesis studies and realizes the two kinds of embedded and extraction algorithms based on chaotic keys in the AVS Audio MDCT domain. The chaotic sequence can be used as the watermarking using the initial value and parameter as secret keys, moreover, a 64X64 image can be encrypted with the chaotic sequence to improve the digital watermarking structure and increase the encryption. Meanwhile, the thesis realizes the blind detection with module 2 data operation.The algorithm is validated with Matalab7.1 using the AVS standard encoding and decoding software. The simulation results show the robustness and imperceiveness of the watermarking, moreover, it can be embedded with high capacity using blind detection. Meanwhile, it can keep the good property after the filter, resample, requantization, and the AVS encoding and decoding attacks. It is possible to protect the AVS Audio copyright according to the specific requirements.