| Presentation | 2002/3/7 Character Recognition in Scene Images by Controlling Focal Length 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) | This paper proposes a method that estimates the optimum focal length for character recognition even in dim light conditions. Insufficient illumination makes it difficult to determine the correct focal length and decreases the recognition rate. To overcome this problem, we determine the optimum focal length for the assumed character size from several recognition experiments for different levels of illumination. Recognition accuracy is further improved by adopting zoom control. Tests involving multiple fonts show that our method increases the recognition rates over a wide range of camera-object distances and illumination levels. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | scene images / character recognition / digital still camera / focal length / zooming |
| Paper # | TL2001-59 |
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| Conference Information | |
| Committee | TL |
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| Conference Date | 2002/3/7(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
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| Vice Chair | |
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| Paper Information | |
| Registration To | Thought and Language (TL) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Character Recognition in Scene Images by Controlling Focal Length |
| Sub Title (in English) | |
| Keyword(1) | scene images |
| Keyword(2) | character recognition |
| Keyword(3) | digital still camera |
| Keyword(4) | focal length |
| Keyword(5) | zooming |
| 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 | ATR MEDIA INFORMATION SCIENCE LABORATORIES |
| Date | 2002/3/7 |
| Paper # | TL2001-59 |
| Volume (vol) | vol.101 |
| Number (no) | 710 |
| Page | pp.pp.- |
| #Pages | 8 |
| Date of Issue | |