Coalescence of device independent bitmaps for artifact avoidance
US6647151B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 1999 |
| Grant date | Nov 11, 2003 |
| Priority date | — |
| Expiry date | Aug 18, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/3876
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to methods of coalescing device independent bitmaps (“DIBs”) into images for rendering onto a printed page such that artifacts induced by global techniques for image enhancement are avoided. The present invention distinguishes three classes of DIBs for separate treatment. One group of DIBs constitute a single and sole image on the page for which full coalescence and subsequent image enhancement is appropriate. Another class of DIBs may constitute separate images on a multiple-image page for which intra- (but not inter-) image coalescence is appropriate followed by separate image-by-image global enhancements. The third class of DIBs are recognized by the present invention as unsuitable for global enhancements and, rather than risk introduction of image artifacts, no global enhancements are applied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.