Retro-stroke compression and image generation of script and graphic data employing an information processing system
US4550438A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1982 |
| Grant date | Oct 29, 1985 |
| Priority date | — |
| Expiry date | Jun 29, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V30/347
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for compactly storing and reproducing script and graphic data from a computer input device. The computer input device sends a time sequence stream of x,y coordinates indicating graphic character locations on the input device. The first coordinate point of the graphic data is stored. Subsequent points are buffered until a reversal in the coordinate magnitude direction is detected with regard to either coordinate axis. This point is taken as a sample point and terminates a buffered segment and starts a new buffered segment. Each segment of the graphic character is approximated by a circular arc segment which is retained by storing the horizontal displacement to the mid-point of the arc segment along with the x and y displacements to the ending point of the segment. The retained information is sufficient to reproduce the input script or graphic for display, print, or manipulation. This is accomplished by mathematically regenerating the arc segments in the same sequence as they were originally created.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.