Technique for DC restoration in AC coupled display systems
US4214271A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1979 |
| Grant date | Jul 22, 1980 |
| Priority date | — |
| Expiry date | Feb 16, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A technique for DC restoration in AC coupled display systems which includes istogramming, more specifically calculation of histogram values, of the difference in gray levels between two adjacent picture lines on a picture element by picture element (PIXEL-by-PIXEL) basis. The gray level obtaining the maximum number of occurrences is considered the mode of the histogram values. This mode used as an addition factor to every PIXEL of one of the lines, to add a predominating background level or DC component thereto, which is used to create the difference of gray levels between the next two adjacent picture lines. This addition sequence is carried on throughout the entire image frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.