Bit-depth extension of digital displays using noise
US6441867B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 22, 1999 |
| Grant date | Aug 27, 2002 |
| Priority date | — |
| Expiry date | Oct 22, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for extending bit-depth of display systems. The method includes the steps of measuring the static display noise of a display device, using the display noise to create pseudo-random noise and subtracting the pseudorandom noise from a contone image. After the noise-compensated image data is quantized and displayed, the noise in the display device will substantially convert the noise-compensated image data back to contone image data with few or no contouring artifacts. Other embodiments include using the inherent noise of the human visual system instead of the static display noise, or both. Specific adjustments can be made to the noise of the human visual system for color displays.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.