To improve a symbol reading rate by obtaining an image of a symbol reading area where a contract between the symbol such as a stamp and a background part is high.
A method for automatically reading a stamp in a captured image of the stamp (a symbol) includes: capturing an image of a stamp reading area including the stamp and a background part in a first light irradiation/capturing state where a primary purpose is to capture an image by regular reflection light from the stamp background part and acquiring a stamp black image (101); and/or capturing an image of the stamp reading area in a second light irradiation/capturing state where a primary purpose is to capture an image by regular reflection light from the stamp and capturing a stamp white image (103); and automatically reading the stamp on the basis of both the acquired images (102, 104, 106, 108, 201, and 202).
| JPH07334617A | 1995-12-22 | |||
| JPH06119492A | 1994-04-28 | |||
| JP2000099625A | 2000-04-07 |
| US4845770A | 1989-07-04 |
Miyazaki Yoshio
Kaoru Onozuka
Akio Tagami
High Masahiro
Tsutomu Kato