Optical correlator
US4127778A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 14, 1977 |
| Grant date | Nov 28, 1978 |
| Priority date | — |
| Expiry date | Jan 14, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/002
- 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.