Halftone display method and display apparatus for reducing halftone disturbances occurring in moving image portions
US6496194B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 27, 1999 |
| Grant date | Dec 17, 2002 |
| Priority date | — |
| Expiry date | Oct 27, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/103
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A halftone display method utilizes an activation sequence, having a plurality of luminance blocks predefined in each frame or field to display an image and having redundancy, that enables one gray-scale level to be expressed by any one of a plurality of combinations of subframes (luminance blocks). When determining luminance blocks for use to display gray scale of an arbitrary first pixel, the luminance blocks to be used for the first pixel are selected in accordance with a predetermined rule, based on how the luminance blocks are used for a second pixel located in close proximity to the first pixel. In this way, by actively utilizing the redundancy of the activation sequence, the occurrence of moving-image false contours (false color contours) in video can be minimized, and also a motion compensation equalizing pulse method can be effectively applied to further improve the image display quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.