| Presentation | 2014-03-07 Comparison of error correction capability between LDPC and Sourlas codes suitable for digital watermarking Nobuhiro HIRATA, Masaki KAWAMURA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | We compare error correction capability between LDPC and Sourlas codes for image digital watermarking. In the case of embedding watermarks by using QIM, messages are extracted with 15% error at a maximum due to JPEG compression. We, therefore, consider to correct errors of messages by error-correction codes; LDPC and Sourlas codes. Sourlas code has high redundancy, since messages are encoded by parity bits. By adjusting number of parity bits, messages are encoded by shortest code length of parity bits. In other words, it can decode from a part of parity bits. LDPC code is one of good error-correcting codes. It is difficult to adjust code length of watermarks, and also capability for error correction is different by code rate. When encoding messages by long code length, they are encoded by short code length, and then watermarks are embedded many times. In this case, since errors can be corrected by majority voting, it is possible to improve capability for error correction. In this report, we compare error correction capability between them, and then LDPC code with majority voting has better performance than the others. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | digital watermark / Sourlas codes / LDPC codes / Sum-product decode / quantization index modulation / JPEG compression |
| Paper # | EMM2013-101 |
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| Conference Information | |
| Committee | EMM |
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| Conference Date | 2014/2/28(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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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) | Comparison of error correction capability between LDPC and Sourlas codes suitable for digital watermarking |
| Sub Title (in English) | |
| Keyword(1) | digital watermark |
| Keyword(2) | Sourlas codes |
| Keyword(3) | LDPC codes |
| Keyword(4) | Sum-product decode |
| Keyword(5) | quantization index modulation |
| Keyword(6) | JPEG compression |
| 1st Author's Name | Nobuhiro HIRATA |
| 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 | 2014-03-07 |
| Paper # | EMM2013-101 |
| Volume (vol) | vol.113 |
| Number (no) | 480 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |