Method and apparatus for enhancing the vertical resolution of a television signal having degraded vertical chrominance transitions
US5844617A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 1995 |
| Grant date | Dec 1, 1998 |
| Priority date | — |
| Expiry date | Nov 22, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/0132
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A received 4-2-0 format, 2-1 interlaced digital component video signal is upconverted to a 4-2-2 format, 2-1 interlaced digital component video signal and a vertical chrominance bandwidth expansion enhancement signal is combined with the chrominance components in order to more closely simulate the wider bandwidth vertical chrominance resolution of the original 4:2:2 format signal from which the 4:2:0 format signal was derived. In a first embodiment, the vertical chrominance enhancement signal is derived from vertical transitions in the luminance component of the 4:2:0 format signal. In a second embodiment, the vertical chrominance enhancement signal is derived from vertical transitions in the luminance component of the 4:2:0 format signal when such vertical transitions are present and, in the absence of a luminance transition, the vertical chrominance enhancement signal is derived from the sampling-rate-reduced chrominance components of the 4:2:0 format signal. In all embodiments, the vertical chrominance enhancement signal is a "bandwidth enhancement" signal which simulates a wide bandwidth vertical detail signal. The vertical chrominance detail signal is self-service from the 4:2…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.