Digital Watermarking Algorithm Based On The Davinci Platform

In recent years, the digital watermarking technology has been developed rapidly in the field of information security as an effective method for protecting digital works'Intellectual Property.The thesis proposes a double digital watermarking algorithm based on DT-CWT, according to the concept of zero-watermark, the stability of Singular Value Decomposition, SVD, and the frequency-domain property of Dual-tree Complex Wavelet Transform, DT-CWT. It also verifies the feasibility of the algorithm through Matlab simulation. The Davinci platform is a complete and easy-to-use set of open platforms, optimized for the digital video system. The digital watermarking algorithm is realized on the DaVinci platform in this thesis. Thereby, the algorithm can be realized conveniently in a DaVinci software framework via the Application Programming Interfaces function.The thesis introduces basic principles of the digital watermarking at first, including the definition, characteristics, classfications and the basic framework of the digital watermarking system. Secondly, it details research status and application of the digital watermarking, typical digital watermarking algorithms and basic evaluation criteria. At last, it focuses on study of principles and realization of algorithms. In the algorithm, a first layer of watermark is embedded by the singular value decomposition; next, an image embedded with the watermark is performed by DT-CWT transform; and then a second layer of watermark is constructed via sub-image matrix acquired by DT-CWT, thus, it has anti-counterfeit effect doubly. Dual watermarks enhance the security greatly. The algorithm not only solves the contradiction between robustness and imperceptibility of the watermark, but also maintains characteristics of each layer of the watermark independently. Simultaneously, the extraction of DT-CWT watermark is independent of the singular valve decomposition, which shortens detection time greatly. Experiments prove that the algorithm has a strong robustness to resist wave filtering, JPEG compression and ordinary geometric attack.DaVinci technology is complex technique, which takes digital video as its application target and is introduced by TI in 2005.The architecture of DaVinci is a programmable DSP and ARM dual-core, and the key value of the DaVinci technology lies in the powerful API function. DaVinci software can be easily called through a standard API interface in a configurable framework. The thesis gives prominence to advantages of the DaVinci platform by introducing itself, then it analyzes the process in which the digital watermarking algorithm is packaged as the DaVinci software, and it also gives the results of the digital watermarking algorithm realized on the DaVinci platform.