International automatic line height system and method
US7271806B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 18, 2002 |
| Grant date | Sep 18, 2007 |
| Priority date | — |
| Expiry date | May 7, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F40/109
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system and method determines an optimum size for a font for readability. A method determines font characteristics by determining a character density for the font and multiplying the character density by a sharpest focusable area of the viewing medium. The method further includes varying the character density according to a range in a number of clusters per fixation to determine a maximum font size and a minimum font size. In an embodiment, the character density is a ratio of a number of clusters per em in the font to a number of visible clusters within a predetermined foveal angle. The predetermined foveal angle can be a field of vision for sharpest focus of an eye or a reader specific foveal angle that reflects the reader's visual acuity, taking into consideration macular degeneration, vision impairments, vision sharpness, tunnel vision, eye disease, near sightedness, far sightedness, dyslexia, and astigmatism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.