Apparatus for generating a two-dimensional coloured display
US4930010A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 27, 1988 |
| Grant date | May 29, 1990 |
| Priority date | — |
| Expiry date | Dec 27, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Apparatus for generating a two-dimensional coloured display in which there is a variation of colour across the display in a predetermined manner, the colour of each pixel in the display being defined by one or more colour components. The apparatus comprises, for each colour component, a memory for storing a pair of gradation curves (X(i), Y(i)) representing the variation in intensity of the color component in orthogonal directions X, Y across the display; a monitor; and processing apparatus. The processing apparatus determines a resultant colour component value V(i,j) for a pixel to be displayed at a location (i,j) on the monitor in accordance with the following formula: EQU V(i,j)=f[a(X(i))b(Y(j))+c(X(i))d(Y(j))] where the pixel has coordinates i,j and k is a normalizing constant, and where a, c, are functions of X(i), b, d are functions of Y(j) and f is an output function, the functions being chosen such that V(i,j) exhibits no discontinuities for all values of X(i), Y(j). The monitor is responsive to the resultant colour component values V(i,j) to display a corresponding colour at a position in the display corresponding to that pixel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.