Character recognition system utilizing feature extraction
US3992697A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1974 |
| Grant date | Nov 16, 1976 |
| Priority date | — |
| Expiry date | Dec 27, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V30/10
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A character recognition system comprising means for scanning a character on a document field, the field being composed of plural features each of which lies in a respectively defined area on the character. A pair of video shift registers, one for positive video and one for negative video, are provided to shift the signals therethrough. Each video shift register includes a plurality of stages for serially storing and shifting a binary quantization of a character pattern sample within said field. Feature extraction logic circuitry is provided and includes a plurality of feature detecting means to provide signals indicative of the recognition of predetermined features as the character pattern is shifted through selected stages of the video shift register. The detecting means include plural mask matrices coupled to said video shift registers. The output of the matrices are provided to encoding means for encoding the signals from the matrices into plural, multi-bit binary codes, one of such codes for each of said geographic areas. Each code serves to indicate a feature detected within the geographic area. Plural shift registers are provided coupled to the encoding means to store said co…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.