Method for recognizing previously localized characters present in digital gray tone images, particularly for recognizing characters struck into metal surfaces
US5073955A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 9, 1990 |
| Grant date | Dec 17, 1991 |
| Priority date | — |
| Expiry date | May 9, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V30/10
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for recognizing previously localized characters present in digital gray tone images, particularly for recognizing characters struck in metal surfaces, whereby, for training a trainable character recognition routine, steps are provided to generate reference characters presented line-like and to deposit these reference characters in a working memory of the trainable character recognition routine, whereby the number and nature of the reference characters correspond to the character set from which characters are to be recognized. For recognizing characters, steps are provided: to read the digitized character of the localized character to be recognized into a character recognition routine and an appertaining gray tone image is provided, to pre-process the character to be recognized so that a classification of the appertaining character can be implemented; to compare the preprocessed character to all reference characters previously learned by the character recognition routine, to implement a majority decision for identifying that reference character that has the greatest plurality of sub-features coinciding with the character to be recognized, and to produce a result signal from…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.