Object-based optical character recognition pre-processing algorithm
US8457423B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 2011 |
| Grant date | Jun 4, 2013 |
| Priority date | — |
| Expiry date | Sep 6, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V30/10
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method of pre-processing a defocused image of an object includes applying an object-based sharpening filter on the defocused image to produce a sharper image; and quantizing the sharper image using block-wise quantization. A system for generating decoded text data from alphanumeric information printed upon an object includes a camera that obtains image data of the alphanumeric information. The system also includes a pre-processor that (a) performs block-wise quantization of the image data to form conditioned image data, and (b) performs optical character recognition on the conditioned image data to generate the decoded text data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.