Bi-level display system
US3961134A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 9, 1975 |
| Grant date | Jun 1, 1976 |
| Priority date | — |
| Expiry date | May 9, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/70
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Continuous tone images are displayed on a bi-level display device by establishing thresholds for each display element and actuating a particular element when its intensity .phi. bears a predetermine relationship to the established threshold. Thresholds .phi..sub.T are established by determining the average intensity .phi. of picture elements in the neighborhood of a particular display element, and by constraining the average to a narrower range according to a single value function of .phi. such as ##EQU1## WHERE .phi..sub.MAX IS THE MAXIMUM INTENSITY POSSIBLE AND .gamma. IS A CONSTANT WHICH CAN BE DETERMINED SUBJECTIVELY OR WHICH CAN BE RELATED TO THE NOISE IN THE PICTURE AREA.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.