Ferroelectric optical image comparator
US5267179A · kind A · utility
12Cited by
30References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 30, 1989 |
| Grant date | Nov 30, 1993 |
| Priority date | — |
| Expiry date | Aug 30, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/88
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A ferroelectric optical image comparator has a lead lanthanum zirconate titanate thin-film device which is constructed with a semi-transparent or transparent conductive first electrode on one side of the thin film, a conductive metal second electrode on the other side of the thin film, and the second electrode is in contact with a nonconducting substrate. A photoinduced current in the device represents the dot product between a stored image and an image projected onto the first electrode. One-dimensional autocorrelations are performed by measuring this current while displacing the projected image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.