Method and apparatus for concealing errors in a digital television signal
US4498104A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 26, 1982 |
| Grant date | Feb 5, 1985 |
| Priority date | — |
| Expiry date | May 26, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/945
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The digital signal values of adjacent picture points of pairs of points straddling the picture point currently being processed in every direction are compared in terms of only their more significant bits to determine which, if any, of the pairs involve a difference of value greater than a predetermined threshold. The determination that such a value difference is present is treated as the recognition of a picture contrast feature and causes, through operation of a read-only memory, the exclusion of such a picture point pair from the averaging process for producing a substitute value for the picture point currently under processing when the latter is found unusable by means of an error-detector. The resulting system for concealing errors detected in television picture avoids disturbing the outlines of picture features as other systems do which substitute averages of neighboring picture points for picture points found to be erroneous.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.