Window-relative dither circuit
US5301269A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1991 |
| Grant date | Apr 5, 1994 |
| Priority date | — |
| Expiry date | Mar 15, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G3/2051
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit for performing window-relative dithering of intensity data comprises a programmable dither cell; circuitry for comparing dither values stored in the dither cell with selected parts of the intensity values and outputting an increment signal in accordance with the results of the comparison; a wrap prevention circuit for preventing the intensity from being incremented if incrementing would cause the intensity to wrap to a low value; and an adder for incrementing the intensity in response to the increment signal, provided it is not inhibited by the wrap prevention circuit. The dither circuit may be advantageously employed in a computer graphics system to dither pixel intensity values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.