Methods and apparatus for halftoning continuous-tone images
US8749848B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 7, 2012 |
| Grant date | Jun 10, 2014 |
| Priority date | — |
| Expiry date | Jun 14, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/405
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of halftoning a continuous-tone image includes the step of expressing a transition tone intensity by a maximum population density of halftone dots equal in size and having a transition dot size. Expressing tone intensities darker than the transition tone intensity includes increasing dot sizes beyond the transition dot size of the maximum population. Expressing tone intensities lighter than the transition tone intensity includes using a population density lesser than the maximum population density, and each relatively darker tone includes a relatively smaller dot size and a relatively larger population density than each relatively lighter tone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.