Illumination detecting and recording method and device therefor
US4079388A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1976 |
| Grant date | Mar 14, 1978 |
| Priority date | — |
| Expiry date | Jan 27, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/246
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Conventionally, color films must be used with the light source or illumination for which it was designed, such as for natural daylight, fluorescent-light or tungsten-light or, if used with another light source, a suitable conversion filter must be placed over the camera lens. However, an improvement in the emulsion of the film provide an improved type of film with which good printed images are available through a mere correction during printing of the film. The present invention provides a method and a device for detecting and recording the type of illumination through detection of their spectral properties and detection of existence of a flickering noise due to an alternating voltage of the commercial power supply, and a system for an automatic film development.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.