| Summary: | 博士 === 國立臺灣大學 === 電機工程學研究所 === 93 === In this dissertation, the algorithm and architecture design and implementation of digital watermarking coding system are presented. The research focuses on three watermarking system: SoC IP watermarking for IP identification and digital right management framework, wavelet-based visible watermarking and fragile watermarking.
Advances in semiconductor processing technology have led to rapid increases in integrated circuit (IC) design complexity. Intellectual property (IP)-based design methodologies have become a major concern in IC industries. Design reuse leads to the development of intellectual property identification techniques. A novel testing-based watermarking scheme for intellectual property (IP) identification is proposed. The principles are established for development of new watermarking IP identification procedures that depend on current IP-based design flow. Then, the digital right management framework for IP release is developed according IP identification technology. IP vendor or designer can protect and manage IPs adopting this method. The proposed scheme provides IP identification and digital right management complete solution.
Visible watermarking schemes are important intellectual property right protection mechanisms for digital images and videos that have to be released for certain purposes but illegal reproductions of them are prohibited. Efficient hardware architecture of wavelet-based adaptive visible watermarking is presented that adopts approximate technique, numerical reduction and resource sharing technique to reduce hardware complexity. Luminance characteristics are calculated to estimating the effect of background luminance. Local spatial characteristics are analyzed to characterize the activity level of pixels. The watermark image is embedding by modifying the coefficients of the host image according to scaling factor. According to experimental results, our method reduces the hardware complexity and holds high image quality. The experimental results have proven the proposed architecture is indeed hardware-effective.
A fragile watermark is useful in image authentication applications. A novel wavelet-based fragile watermarking scheme is designed according to the wavelet coefficients of the host image. This fragile watermark records the characteristics of the original image and is extracted without original image. After the fragile watermark is extracted, the approximate host image can be reconstructed. Then a modified image can be detected according to the fragile watermark and the reconstructed image. Afterward, an artificial neural network is used to analyze the tampering of the host image, locate where the tampering has occurred, and identify what kind of alteration has occurred. The fragile watermark provides sufficient authentication evidence. This method is novel and efficient.
In this dissertation, a testing-based IP watermarking, wavelet-based visible watermarking and fragile watermarking are designed and implemented. Solving remaining open problems related to digital watermarking and DRM developments are future research direction of the author.
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