Information extraction apparatus, information extraction method, information-extraction computer program product, and storage medium
US8514457B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 13, 2010 |
| Grant date | Aug 20, 2013 |
| Priority date | — |
| Expiry date | Nov 18, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/32208
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Tools are provided for (i) obtaining image data in which information is embedded by printing multiple types of patterns in a matrix, (ii) calculating multiple vertical-line-segment sequences and multiple horizontal-line-segment sequences, obtained by connecting vertically arranged patterns and horizontally arranged patterns, respectively, in the image data with polygonal lines, (iii) searching for a vertical line segment and a horizontal line segment intersecting with each other for each combination of one of the vertical-line-segment sequences and one of the horizontal-line-segment sequences, (iv) calculating an intersection point between the thus-found vertical line segment and the horizontal line segment as a position of a pattern, and (v) extracting the information embedded in the printed material by identifying types of patterns at the calculated intersection points.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.