Optical pattern recognition apparatus with coordinate conversion function
US5528702A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | May 20, 1992 |
| Grant date | Jun 18, 1996 |
| Priority date | — |
| Expiry date | May 20, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/92
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An optical pattern recognition apparatus has an optical coordinate converter unit which simultaneously and in parallel converts an entered reference image and an entered input image from an entered coordinate system to a desired coordinate system to produce a coordinate-converted reference image and a coordinate-converted input image. A joint transform correlator receives the coordinate-converted reference image and the coordinate-converted input image and generates a correlation coefficient between the coordinate-converted reference image and the coordinate-converted input image so that a correlation between each entered reference and each entered input image is obtained to effect pattern recognition in real time. A feedback circuit normalizes the generated correlation coefficient between the coordinate-converted reference image and the coordinate-converted input image with a maximum correlation coefficient. The feedback circuit changes a subsequently generated correlation coefficient between the coordinate-converted reference image and the coordinate-converted input image depending on the normalized correlation coefficient so that, if the coordinate-converted reference image is o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.