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Based on random fractional Fourier transform adaptive watermarking algorithm

Author: GuoJun
Tutor: LiuShuTian
School: Harbin Institute of Technology
Course: Optics
Keywords: Digital watermarking Adaptive Watermarking Random fractional Fourier transform Block selection Choose high amplitude Phase Shift Keying Amplitude Shift Keying
CLC: TP309.7
Type: Master's thesis
Year: 2008
Downloads: 34
Quote: 0
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Abstract


With the arrival of the information age , multimedia data protection of property rights and certification to become a big problem. Digital watermarking is a potential way to solve these problems , the watermark information embedded by the carrier , on other occasions the watermark information recovery , thus proving the ownership of the carrier . And many recent work has focused on improving its robustness to face a variety of attacks . In this article, we propose a random fractional Fourier transform based watermarking algorithm. Random fractional Fourier transform is based on the fractional Fourier transform is a new transformation, with the Fourier transform and fractional Fourier transform similar nature that he has a lot of good , easy optical implementation. Transform itself has a strong safety, so that our watermarking algorithm has a good anti-attack capability. We used the random scrambling to improve the security of the watermark . In addition to random fractional Fourier transform , we use random block selection and high amplitude selection to improve the robustness of the algorithm . Meanwhile, we can adjust the phase shift keying / amplitude shift keying strength to improve the algorithm transparency. Our solution is based on image feature extraction, in the analysis of the main image feature extraction algorithm based on , we combine the image fractal dimension characteristics to determine the embedded position and intensity , consistent with human visual model , to ensure the watermark transparency while also strengthening the security of the watermark , the watermark is an adaptive algorithm, is a new generation of watermarking algorithms for watermark embedding and detection provides a convenient. In the paper, we designed two programs . Compare two scenarios were tested in a variety of processes under two scenarios watermarking algorithm results, obtained watermarking algorithm optimization results, and watermarking algorithms involved in all the relevant factors are analyzed , pointing out that the performance -related reasons, and the direction of future work . We conducted under several conditions of attack to verify the effectiveness of the proposed watermarking algorithm , the results show that the proposed algorithm to noise attack , attack and JPEG compression shear attack is effective. Comparison with other algorithms , and a number of security against attacks also shows certain advantages . The results show that the proposed watermarking algorithm has some applicability .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > General issues > Security and confidentiality > Encryption and decryption
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