Method for smooth trap suppression of small graphical objects using run length encoded data
US7271934B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 10, 2003 |
| Grant date | Sep 18, 2007 |
| Priority date | — |
| Expiry date | Dec 21, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/58
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for smooth trapping of an object containing run length encoded image pixel data, includes collecting a number of scanlines of run length encoded pixel data equal to 2M in a buffer, wherein M is a line width trap threshold; determining those runs within the collected scanlines that require trapping, wherein a run is a portion of a scanline; if trapping is required in the fast scan direction and the length of the run requiring trapping is less than M, reducing the width of the trap region by a prorated percent. If trapping is required in the slow scan direction, and the number of runs above and below the run to be trapped is less than M, reducing the number of runs above and below the run to be trapped by a prorated percentage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.