Method and device for intralinearly halftoning digitized grey value images
US5604605A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 13, 1994 |
| Grant date | Feb 18, 1997 |
| Priority date | — |
| Expiry date | Apr 13, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4052
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and device for parallel intralinear halftoning of digitized grey value images divided into lines pixels, including (1) successive thresholding of grey values of the pixels and (2) transportation of a quantization error for each pixel to at least one neighboring pixel still to be thresholded by adjusting the grey value of the at least one neighboring pixel with at least a portion of the quantization error. The halftoning includes: dividing each of the lines of pixels into at least two disparate groups of pixels; separately thresholding each group of pixels within each line; and transporting the quantization error from a pixel of one group to at least one pixel of at least one other disparate group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.