Method and apparatus for avoiding moire in digitally resized images
US6597411B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 2000 |
| Grant date | Jul 22, 2003 |
| Priority date | — |
| Expiry date | Oct 6, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2340/0407
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for reducing the appearance of moiré in a digitally resized image wherein each input pixel value is mapped to a new value by means of a first correction function prior to being resized. At the output of the resizing engine, each pixel in the resized image is mapped to a further new value by means of a second correction function prior to being displayed. The second correction function is chosen such that the intensity of light output from the display device is substantially proportional to the value of the signal from the resizing engine, taking into account the combined transfer functions of the second correction means and the physical display device (i.e. the second correction function is substantially the inverse of the display transfer characteristic). The first correction function is chosen to be substantially the inverse of the second function, resulting in the effect of reducing moiré that would otherwise appear in the presence of high spatial frequencies, while leaving the overall DC transfer characteristic unaffected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.