| Project/Area Number |
12555111
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
情報通信工学
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
MIYAZAKI Akio Graduate School of Information Science and Electrical Engineering (ISEE), Kyushu University, Ass. Prof., 大学院・システム情報科学研究院, 助教授 (70192763)
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| Co-Investigator(Kenkyū-buntansha) |
SAKURAI Kouichi ISEE, Kyushu University, Ass. Prof., 大学院・システム情報科学研究院, 助教授 (60264066)
OOHAMA Yasutada ISEE, Kyushu University, Ass. Prof., 大学院・システム情報科学研究院, 助教授 (20243892)
鎌田 清一郎 九州大学, 大学院・システム情報科学研究院, 助教授 (00204602)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥8,500,000 (Direct Cost: ¥8,500,000)
Fiscal Year 2001: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2000: ¥6,100,000 (Direct Cost: ¥6,100,000)
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| Keywords | digital watermark / information security / digital contents / digital video / text document / copyright protection / wavelet transform / morphological signal processing |
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| Research Abstract |
(1) Development of digital watermarking method for images and video : We have proposed a new watermarking method for both still images and video using the wavelet transform. We have confirmed that this method is robust against common image processing operations like lossy compression as JPEG and MPEG, adding noise, reduction of grayscale level, and StirMark attacks. Furthermore, this method enables us to distinguish malicious changes such as modifying or forging a part of an image from non-malicious changes resulting from common image processing operations.
(2) On the evaluation of performance of digital watermarking method in the frequency domain : We have focused on the quantization- and correlation-based watermarking methods in the frequency domain and suggested the model of watermark embedding and extraction system. Next, using this model, we have analyzed the watermarking methods and proposed how to evaluate its performance. As a result, we can know how many bits are able to be embedded and how large the embedded intensity should be set. Furthermore, we have discussed the improvement of the DWT- and DCT-based watermarking methods.
(3) Development of image data protection and management system : Based on the above results, we have proposed several image data protection and management systems as follows :
(a) Playback- and copy-control system for MPEG video.
(b) Retrieval and verification system for digital images.
(c) Authentication and protection system for JPEG images.
Furthermore, we have produced a watermark embedding and extraction software for Windows PC by way of experiment.
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