Character recognition system employing extraneous and required peak detection with variable threshold controlled timing
US3987411A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 1975 |
| Grant date | Oct 19, 1976 |
| Priority date | — |
| Expiry date | Aug 11, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V30/192
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A character recognition system utilizing precisely designed correlation network to match the voltage waveform of a character being read with the closest ideal waveform in a standard character font along with an extraneous peak detector that determines whether extraneous peaks are present in the voltage waveform and a required peak detector that determines whether a predetermined pattern of required peaks are missing from the voltage waveform for that voltage waveform to have been induced by the printed character with which it was preliminarily identified, under the control of a variable threshold controlled timing circuit for an extended dynamic range of voltage waveforms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.