Optical correlator
US4206365A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 26, 1978 |
| Grant date | Jun 3, 1980 |
| Priority date | — |
| Expiry date | May 26, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/46
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to an optical correlator comprising an optical system for imaging an object space, a spatial frequency filter disposed in or close by the image plane, and at least one photoelectric detector assigned to said spatial frequency filter. According to the invention the spatial frequency filter is a raster, the structures of which extend in the direction of the perspective vanishing lines of the image of the object space and/or perpendicularly to at least one of said vanishing lines. The size of the structure elements and/or the distance between the elements constituting the raster structure are chosen according to the distortion of the perspective image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.