Automatic brightness algorithm in a slide to video transfer unit
US5038216A · kind A · utility
32Cited by
6References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1989 |
| Grant date | Aug 6, 1991 |
| Priority date | — |
| Expiry date | Apr 20, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/75
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system for automatically controlling the brightness of an optical image which is translated into digital signal samples corresponding to the pixels constituting the image includes a variable area aperture through which the image is transmitted for digitization into the samples, a device for varying the area of the aperture, a device for detecting peak values of the samples, and a device for operating the aperture area varying device until the percentage of the peak values which are above a certain peak value is a certain percentage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.