| Presentation | 2014-01-28 Decoding watermarks from clipped images and its evaluation based on IHC Ryo KODAMA, Masaki KAWAMURA, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | We report our method that won the IHC Award for images and its evaluation results. The method which has robustness for both JPEG compression and cropping is required in the digital watermarking for images. In this report, we propose the digital watermarking method which has tolerance for these attacks. High-frequency components of images are reduced by JPEG compression. Therefore, it is effective to embed watermarks into low-fre-quency components. In our method, for tolerance for JPEG compression watermarks are embedded into the third LL components of DWT coefficients. Moreover, since it is necessary for the watermarks to be decoded from cropped images, the images are divided into some blocks of a fixed size, and both markers and watermarks are embedded into these blocks. The markers are embedded in order to detect boundary of the blocks. We evaluated our method by using IHC evaluation criteria. As a result, the method can accomplish zero bit error rate at compression ratio 1/60 or larger, and the stego images have tolerance for both JPEG compression and cropping. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | digital watermarking / DCT coefficient / Quantization Index Modulation / wavelet transform / clippiing atack |
| Paper # | EMM2013-93 |
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| Conference Information | |
| Committee | EMM |
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| Conference Date | 2014/1/20(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Vice Chair | |
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| Paper Information | |
| Registration To | Enriched Multimedia (EMM) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Decoding watermarks from clipped images and its evaluation based on IHC |
| Sub Title (in English) | |
| Keyword(1) | digital watermarking |
| Keyword(2) | DCT coefficient |
| Keyword(3) | Quantization Index Modulation |
| Keyword(4) | wavelet transform |
| Keyword(5) | clippiing atack |
| 1st Author's Name | Ryo KODAMA |
| 1st Author's Affiliation | Faculty of Science, Yamaguchi University() |
| 2nd Author's Name | Masaki KAWAMURA |
| 2nd Author's Affiliation | Graduate School of Science and Engineering, Yamaguchi University |
| Date | 2014-01-28 |
| Paper # | EMM2013-93 |
| Volume (vol) | vol.113 |
| Number (no) | 415 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |