Apparatus for detecting registration error using the image signal of the same screen
US5170441A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1991 |
| Grant date | Dec 8, 1992 |
| Priority date | — |
| Expiry date | Mar 12, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/28
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A registration error detection apparatus which includes a circuit that sums up, for a plurality of adjacent pixels, absolute values of differences between a plurality of image component signals which form a same frame of picture, a circuit which detects the registration error based on the minimum value of the output signals provided by the summing circuit, a first evaluating circuit which evaluates the reliability of the detection result of registration error based on the differential signal between an input test signal and an input reference signal, a second evaluating circuit which evaluates the reliability based on differences between the average value of registration error and individual detection results, a third evaluating circuit which calculates the statistic deviation value of the BPF-processed test signal and the reference signal and evaluating the reliability based on the calculation result, and a circuit which makes a final judgement as to whether the detection result is to be accepted or rejected, based on the results of reliability judgement made by the first through third evaluating circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.