US3781801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for optical recognition of characters
Assignee: Turlabor AG
•
Filing: 1971-11-10
•
Granted: 1973-12-25
•
Expires: 1991-11-10
Abstract
Abstract A character is optically scanned by being moved in a direction perpendicular to an alignment of photosensitive elements such as photodiodes. The photodiodes, to which sampling pulses are applied produce successive scanning pulses so that the character can be considered as divided into a matrix grid. The information within the matrix grid is grouped into several displaced grids, each displaced grid representing information produced at corresponding offset locations in a cell of the original grid. The information of each of the displaced grids is separately compared bit by bit with reference characters to ascertain conformity to the greatest degree to establish identity of the character which has been scanned.
Inventors
- 👤 M Anderegg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:03
CPC Classifications
G; G06; G06V; G06V10/00; G06V10/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
195 words
A process for the optical recognition of characters, in which the character is scanned in the manner of a grid formed of cells arranged along mutually perpendicular coordinate axes, the scanning information thus obtained being compared with references characters, said process comprising scanning the character which is to be recognized within each grid cell, the scanning being effected by photoelectrically sensitive elements which are arranged in a column and by moving the character to be recognized perpendicularly to said column, two of the photoelectrically sensitive elements being arranged in said column for each grid cell, supplying two successive sampling pulses to each photoelectrically sensitive element during the time corresponding to the relative change of position of the character by the distance of one grid cell such that four scanning portions are obtained for each grid cell, evaluating the scanning information corresponding to identical positions in all grid cells separately from the scanning information of the other positions, and comparing each evaluated scanning information of said identical positions bit by bit with the reference characters to determine the reference character having the greatest degree of conformity with one of said evaluated scanning information of identical positions.
Claim 2
Dependent Claim
195 words
A process for the optical recognition of characters, in which the character is scanned in the manner of a grid formed of cells arranged along mutually perpendicular coordinate axes, the scanning information thus obtained being compared with references characters, said process comprising scanning the character which is to be recognized within each grid cell, the scanning being effected by photoelectrically sensitive elements which are arranged in a column and by moving the character to be recognized perpendicularly to said column, two of the photoelectrically sensitive elements being arranged in said column for each grid cell, supplying two successive sampling pulses to each photoelectrically sensitive element during the time corresponding to the relative change of position of the character by the distance of one grid cell such that four scanning portions are obtained for each grid cell, evaluating the scanning information corresponding to identical positions in all grid cells separately from the scanning information of the other positions, and comparing each evaluated scanning information of said identical positions bit by bit with the reference characters to determine the reference character having the greatest degree of conformity with one of said evaluated scanning information of identical positions.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |