Camera method and apparatus for recording with selected contrast
US4272186A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 21, 1979 |
| Grant date | Jun 9, 1981 |
| Priority date | — |
| Expiry date | May 21, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/727
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The provision in front of the image surface of a photosensitive element of a device that selectively directs image light with increased intensity to microscopic, spaced-apart portions of the image surface yields a photograph or like record having a selectively decreased contrast. The photograph is viewed independently of its location relative to the light directing device. Changing the apparent aperture through which image light reaches the light-directing device can control the amount of contrast decrease. Further, selective filtering of a portion of the incident light separately controls the contrast of high-exposure portions of the image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.