http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CA-1256214-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_177ffddcf403561ef91f982bdce914e2 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H04N1-41 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G06K9-58 |
| filingDate | 1984-04-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1989-06-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_7169f3b5c40c33270609d90c612ccab4 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_745b3a005bc8752a1e30cab17c750c3e http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4c72663f376f5f4a981c07616d7b304e |
| publicationDate | 1989-06-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CA-1256214-A |
| titleOfInvention | Method and apparatus for vectorizing documents and for symbol recognition |
| abstract | Abstract An apparatus codes a scanned document locally representing each graphic element within a prescribed measure of accuracy by a trapezoidal approximation. The invention also includes a method for similarly coding a scanned document. The apparatus determines whether each scanned run is indicative of a .gamma.- or .lambda. -junction, the termination of an old, or the commencement of a new graphic element, and whether a new linear approximation is necessary. The invention in a preferred embodiment recognizes symbols by determining the center of mass and maximum extremity of a symbol candidate, and comparing it to a reference library after normalizing with respect to scale, orientation and center of mass. In a preferred embodiment, an adaptive threshold parameter governs coding so as to reject noise and optimize a pair of linear predicters in a small number of scans. In a further preferred embodiment the accuracy of the linear predicters is refined so that the error is exponentially bounded. |
| priorityDate | 1984-04-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 27.