Device and method for reducing the amplitude range of signals representing an image
US4712132A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 8, 1986 |
| Grant date | Dec 8, 1987 |
| Priority date | — |
| Expiry date | Jan 8, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/68
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An embodiment of the device comprises: three subtracters, three multipliers and a correction coefficient determination device. The subtracters and multipliers make it possible to obtain three signals, whose values are multiplied by a same coefficient, in order that they retain the same ratios as the values of the signals supplied to the input of the device. The device for determining a correction coefficient comprises means for determining which of the input signals has the highest instantaneous value at each time, in order to apply thereto a predetermined, non-linear transformation and for supplying a correction signal which is applied to the multipliers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.