Optical information-reading apparatus and optical information-reading method
US8718370B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 26, 2011 |
| Grant date | May 6, 2014 |
| Priority date | — |
| Expiry date | Oct 22, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/1478
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus to enable a position of an image to be identified and to enable the image to be recognized reliably even when the image is unclean or external disturbance light is irradiates the image. On a assumption that a binarization threshold value is calculated for every block based on the maximum and minimum values of the brightness values in code symbol data, plural adjacent blocks, the threshold values of which are calculated, are grouped to generate groups. The area of each of the groups thus generated is compared with a predetermined area for a comparison standard and if the area of each of the groups thus compared is larger than that, these groups are selected. The position of the selected groups is identified. Brightness value of the code symbol data are binarized using the threshold value for every block in the selected groups.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.