Method and apparatus for cancelling chrominance artifacts
US4003077A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 25, 1976 |
| Grant date | Jan 11, 1977 |
| Priority date | — |
| Expiry date | Feb 25, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/86
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A color video recorder/reproducer records wide bandwidth luminance information alternately with narrow bandwidth luminance information plus chrominance information for the transmitted lines of a television picture frame. Before recording, the chrominance information is frequency converted to occupy a frequency band substantially adjacent to the frequency band occupied by the narrow bandwidth luminance information. Upon playback, the frequency converted chrominance information is separated from the narrow bandwidth luminance information and converted to its originally occupied frequency band. A video signal is then reconstructed by combining the signal recorded for a given line with a complementary portion of the signal recorded for the preceding line. Upon display of a picture thus produced, an artifact pattern is observed. The present invention recognizes the source of this artifact pattern to be the imperfect separation of the narrow bandwidth luminance information from the chrominance information. Rather than employ expensive and complicated filtering devices to better separate the two signals, the present invention permits the small portion of chrominance information to stay in…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.