Color misregistration easing system which corrects on a pixel or block basis only when necessary
US5485203A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 1992 |
| Grant date | Jan 16, 1996 |
| Priority date | — |
| Expiry date | Aug 5, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/15
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An encoder decomposes an input color image signal into a luminance signal and color signals, places the color signals in image memories, then fetches color signals of a given screen before and after. A detector calculates differences between the color signals to detect color misregistration either on a pixel basis or a block basis. On the other hand, color signals of a last image acquired before occurrence of color misregistration are stored in frame memories. When color misregistration is detected, a corrector reads the color signals of the last image from the frame memories, and produces correction signals. A counter carries out counting for each difference between color signals of given screens before and after, then detects a distribution of color misregistration of a screen. A selector checks the distribution of color misregistration of a screen to identify the cause of color misregistration, then selectively outputs either the input color image signal or a correction signal sent from the corrector. Thereby, color misregistration is corrected either on a pixel basis or a block basis. This prevents deterioration of image quality due to unnecessary correction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.