Automatic optimization of the position of stems of text characters
US6597360B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 10, 2000 |
| Grant date | Jul 22, 2003 |
| Priority date | — |
| Expiry date | Apr 10, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2340/0457
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides for automatic placement of typographical features such as vertical stems or horizontal segments of a character on high contrast pixel sub-component boundaries as part of a rendering process that uses separately controllable pixel sub-components of pixels to represent different portions of the character. In order to identify the typographical features of the character that are to be aligned with high contrast pixel sub-component boundaries, topology of the character is analyzed at runtime. In display devices having vertical stripes of same-colored pixel sub-components, it has been found that character legibility is increased when the left edges of stems are aligned with high contrast boundaries between pixel sub-components. Processing time and resources are conserved by performing a partial, rather than a full, topological analysis of the character. For example, some font files include data structures that define the position of key control points associated with the character, thereby indicating where the stems or other typographical features are located, and the relationship between different typographical features.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.