Halftone image estimation methods for dither images
US4803558A · kind A · utility
29Cited by
1References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 10, 1986 |
| Grant date | Feb 7, 1989 |
| Priority date | — |
| Expiry date | Nov 10, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/40075
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a method of estimating a halftone image in which a plurality of scanning unit areas including, at least, a unit area of (1 pixel.times.1 pixel) are set in a binary image consisting of white and black regions; a binary image obtained from estimated values based on a ratio between white and black regions within the scanning unit area; an estimated value of an optimum scanning unit area is obtained per every pixel of the halftone image is produced based on the estimated value; and further the estimated halftone image is reconverted to a binary image after processing of enlarging or reducing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.