| Presentation | 2001/9/7 Camera-distance-related properties of character recognition in everyday scene images Takahiko SHIMMURA, Yoshinao SHIRAKI, Naoki MUKAWA, Minako SAWAKI, Norihiro HAGITA, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Character recognition systems using digital camera images should not only deal with the degradation of the character images but also address factors like camera distance, different illumination conditions and zoom control. In this paper, we report some results concerning the depth-related properties of several character recognition methods using two features (the "LDC", representing stroke direction distribution, and the "binary pattern-feature", representing blurred character patterns) and several preprocessings. Our experimental results for 26 alphabet characters with 20 fonts show that the tolerance range with LDC is superior, achieving a recognition rate over 90% for high-resolution images. However a zoom controller has to be employed in the case of low-resolution images to improve recognition. It also shows that the use of binary patterns coming from different binarization thresholds as input makes the tolerance range expand. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | scene images / pattern recognition / character recognition |
| Paper # | PRMU2001-97 |
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| Conference Information | |
| Committee | PRMU |
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| Conference Date | 2001/9/7(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
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| Paper Information | |
| Registration To | Pattern Recognition and Media Understanding (PRMU) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Camera-distance-related properties of character recognition in everyday scene images |
| Sub Title (in English) | |
| Keyword(1) | scene images |
| Keyword(2) | pattern recognition |
| Keyword(3) | character recognition |
| 1st Author's Name | Takahiko SHIMMURA |
| 1st Author's Affiliation | NTT Communication Science Laboratories, NTT Corporation() |
| 2nd Author's Name | Yoshinao SHIRAKI |
| 2nd Author's Affiliation | NTT Communication Science Laboratories, NTT Corporation |
| 3rd Author's Name | Naoki MUKAWA |
| 3rd Author's Affiliation | NTT Communication Science Laboratories, NTT Corporation |
| 4th Author's Name | Minako SAWAKI |
| 4th Author's Affiliation | NTT Communication Science Laboratories, NTT Corporation |
| 5th Author's Name | Norihiro HAGITA |
| 5th Author's Affiliation | NTT Communication Science Laboratories, NTT Corporation |
| Date | 2001/9/7 |
| Paper # | PRMU2001-97 |
| Volume (vol) | vol.101 |
| Number (no) | 303 |
| Page | pp.pp.- |
| #Pages | 7 |
| Date of Issue | |