Photographic imaging
US4063799A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 1965 |
| Grant date | Dec 20, 1977 |
| Priority date | — |
| Expiry date | Oct 23, 1985 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/46
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This disclosure depicts an optical system and method for encoded storage and retrieval, wherein record images are enciphered using incoherent light and wherein deciphering of the coded images is performed in coherent light. More particularly, the disclosure depicts encoding images by inserting a complex phase function in the Fourier transform plane of the imaging means which satisfies the relation: EQU .PHI.(x, y) = .PHI.(-x, -y). To retrieve a decoded image of the original object, the encoded record is illuminated with collimated coherent quasi-monochromatic light and its Fourier transform is formed in a plane in space. A complex phase function equal to the autoconvolution of the coding function is located in the transform plane. The phase-altered distribution in the transform plane is retransformed to produce a decoded image. Exemplary coding and decoding phase function is also depicted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.