Image half-tone processor and method thereof
US6897981B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 30, 2002 |
| Grant date | May 24, 2005 |
| Priority date | — |
| Expiry date | Feb 13, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/40075
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A primary binary image is converted into a weighted multivalued image with pixel values weighted. An upper shift-inverting unit inverts the pixel values, shifts them upward by one dot, and thus converts the primary binary image into an inverted upper-shifted image. A lower shift inverting unit inverts the pixel values, shifts them downward by one dot, and thus converts the primary binary image into an inverted lower-shifted image. A right shift inverting unit inverts the pixel values, shifts them rightward by one dot, and thus converts the primary binary image into an inverted right-shifted image. A left shift inverting unit inverts the pixel values, shifts them leftward by one dot, and thus converts the primary binary image into an inverted left-shifted image. A gradation processing unit subtracts the inverted upper-shifted image, inverted lower-shifted image, inverted right-shifted image and inverted left-shifted image from the weighted multivalued image, thereby synthesizing these pieces of image data. The primary binary image is thus converted into the half-tone image with gradations containing half-tones.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.