Image processing method and apparatus for correlating a test image with a template
US5809171A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 5, 1996 |
| Grant date | Sep 15, 1998 |
| Priority date | — |
| Expiry date | Jan 5, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/94
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The image correlation method and apparatus correlates or matches a test image with a template. The image correlation apparatus includes an image processor for partitioning the template into a number of labels, for determining the total number of pixels N.sub.T which form the template and for determining the number of pixels N.sub.i which form each of the labels i. The image correlation apparatus also includes comparator for comparing the test image to the template. The comparator respectively determines, for each predetermined gray level j, the number of pixels of the test image N.sub.j,i representative of a predetermined gray level j which correspond to a predetermined label i of the template. The comparator respectively also determines, for each predetermined gray level j, the number of pixels of the test image N.sub.j representative of a predetermined gray level j which correspond to the template. The image correlation apparatus further includes correlation means for determining the correlation X between the test image and the template according to a predetermined equation which is based, at least in part, upon N.sub.j,i, N.sub.j, N.sub.i and N.sub.T. The image correlation appar…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.