Video copying apparatus spectrally-responsive to slides or negatives
US4922333A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1988 |
| Grant date | May 1, 1990 |
| Priority date | — |
| Expiry date | Dec 15, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/11
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Video copying apparatus generates a color sequential video signal from originals having different spectral characteristics, such as photographic slides and negatives. The apparatus includes a color filter wheel with a plurality of color filters that are sequentially interposed into the optical path between a camera and the original. By providing separate red filters in the filter wheel, the spectral pass bands of the red filters can be matched to the separate and distinctive red spectral responses of a slide or a negative. The output color video signal is obtained from a progression of filtered image signals generated by the camera according to the type of original. In one embodiment, a succession of video fields including red image signals from both red filters is continuously applied to a framestore and the selection of the appropriate red signal is made by storing only the color video signals corresponding to the desired type of original.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.