Detection of barcodes in binary images with arbitrary orientation
US5120940A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 10, 1990 |
| Grant date | Jun 9, 1992 |
| Priority date | — |
| Expiry date | Aug 10, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/1443
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The location and orientation of a barcode block is determined by first producing an image of the document that excludes the barcode block and producing a second image wherein the spaces in the barcode block have been deleted thereby providing a solid rectangular block. The two images are subtracted to reject large background clutter while displaying with certainty the full image of the barcode block. Thereafter, down-sampling occurs to remove small clutter and other non-barcode objects while locating the centroid of each barcode block. The image containing the centroid is up-scaled and used to calculate the position of the barcode block in the original document for use by a barcode reader.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.