| Presentation | 2006-02-21 A Watermark Decoding by an Extraction Key in Karhunen Loeve Based Watermarking Takeshi YAMAMOTO, Mitsugu KAKUTA, Yukio KOSUGI, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | A digital watermark is useful technology as a method to embed kind of key information for proof to digital contents. The digital watermark (KL watermark) for the image based on Karhunen Loeve transformation that we have proposed is an embedding method by application of the basis of an image. The method has confirmed that it has tolerance to JPEG compression and composite transformation. Moreover, it has a feature that an embedded watermark information can be taken out in the hand from received the embedding image. However, this feature is also the subject that the taken-out watermark will be used for another contents image. To such a subject, in the previous work [1], KL watermarking by low embedding intensity (dumping factor) was studied. Generally, by the digital watermarking, if a dumping factor becomes large, decoding accuracy will improve. Since there is such character, the embedding which enlarged the dumping factor in the range that can permit degradation of embedding quality of image is general approach. In the embedding by KL watermark such a tendency is also the same. In the previous study, in order to make it difficult to watermark divert, disorder of a data structure of embedding image is applied. Such disorder effect occurs in an embedding image, after an embedding image passes a multimedia communication system. Moreover, it was shown that separation with a cover image and a watermark becomes difficult in decoding by such embedding. In this paper, an image authentication based on KL watermark is proposed. First, by proposed method, encryption of a watermark is performed in embedding. In decoding, a watermark can be extracted only by performing decoding using a threshold value. Next, it is shown that decoding from the image by the proposed method is performed with the open algorithm of decoding, while this paper shows that decoding from the image embedded by conventional method is not performed. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Karhunen Loeve Transform / Watermarking / Multimedia Communication / Data Structure / Open Algorithm |
| Paper # | ITS2005-83,IE2005-290 |
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| Conference Information | |
| Committee | ITS |
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| Conference Date | 2006/2/14(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Intelligent Transport Systems Technology (ITS) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A Watermark Decoding by an Extraction Key in Karhunen Loeve Based Watermarking |
| Sub Title (in English) | |
| Keyword(1) | Karhunen Loeve Transform |
| Keyword(2) | Watermarking |
| Keyword(3) | Multimedia Communication |
| Keyword(4) | Data Structure |
| Keyword(5) | Open Algorithm |
| 1st Author's Name | Takeshi YAMAMOTO |
| 1st Author's Affiliation | Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology() |
| 2nd Author's Name | Mitsugu KAKUTA |
| 2nd Author's Affiliation | Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology |
| 3rd Author's Name | Yukio KOSUGI |
| 3rd Author's Affiliation | Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology |
| Date | 2006-02-21 |
| Paper # | ITS2005-83,IE2005-290 |
| Volume (vol) | vol.105 |
| Number (no) | 609 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |