Image processing apparatus
US4833721A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1988 |
| Grant date | May 23, 1989 |
| Priority date | — |
| Expiry date | Feb 11, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/754
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An image processing apparatus comprises a detector which includes an image reading section of a digital copier and which chases outline information of an image pattern in a predetermined direction and thereby extracts outline points; an arithmetic operating circuit to respectively obtain outline tangential directions on the basis of the outline points; an extracting circuit to select a predetermined number of extraction points from the outline points; a coding circuit to sequentially obtain direction differences in the outline tangential directions on the basis of the extraction points and to code the direction differences; and a recognizing circuit to perform a non-linear matching between a code sequence coded by the coding circuit and a reference code sequence, thereby recognizing the image pattern. The coding circuit calculates the outline tangential directions using predetermined direction codes. With this apparatus, an image pattern can be stably and accurately recognized at high speed without being influenced by positional deviation, rotation, change in size, or the like of the image pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.