Methods, apparatus and data structures for overscaling or oversampling character feature information in a system for rendering text on horizontally striped displays
US6339426B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1999 |
| Grant date | Jan 15, 2002 |
| Priority date | — |
| Expiry date | Apr 29, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S345/947
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The resolution of text rendered on a display device having sub-pixel elements, such as an RGB LCD for example, and in particular, on a display device having horizontal striping is enhanced by (i) overscaling (or oversampling) character outline information in the vertical (or Y) direction, and (ii) filtering displaced information from the overscaled (or oversampled) character outline information. Metrics associated with character outline information may be appropriately adjusted. The vertical (or Y) position of the baseline of adjacent characters may be constrained by forcing the first pixel above the baseline to be composed of a full number N of scan conversion source samples, where N corresponds to an overscaling (or oversampling) factor. Groups of scan conversion source samples may be converted into packed pixel index values. Color values may be selectively filtered when the differences in the intensity of adjacent sub-pixel elements would otherwise be irritating to view. Finally, the gamma of the pixel values may be corrected so that the gamma of the display device is considered and so that intensity values of sub-pixel elements fall within a range of intensities in which gamma …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.