Optical correlator
US6804412B1 · kind B1 · utility
35Cited by
8References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 14, 2000 |
| Grant date | Oct 12, 2004 |
| Priority date | — |
| Expiry date | Aug 14, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06E3/005
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method is described of optically performing a joint transform correlation starting from images displayed side-by-side on a spatial light modulator illuminated by a collimated light source. The image is focused by a lens onto a camera, the image is recorded by a frame grabber, and processed by a computer. By using a two pass process, the result is a measure of the correlation of the images. The images may be preprocessed in a phase-encoded chequerboard pattern and binarised by thresholding based on the average value of neighbouring pixels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.