Digital luminance signal transient improver and peaker
US5146319A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1989 |
| Grant date | Sep 8, 1992 |
| Priority date | — |
| Expiry date | Jul 13, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/208
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A luminance signal transient improver and non-linear peaking arrangement processes a digital luminance signal by generating a first difference signal and a second difference signal and developing therefrom a threshold control signal, a high frequency peaking signal and a low frequency peaking signal. The high frequency peaking signal consists of the second difference signal as modified by a high pass filter and the threshold control signal consists of the second difference signal as modified by a threshold circuit. The first difference signal is passed through an absolute value circuit and a low frequency emphasis circuit and modified by the threshold control signal and added to the high frequency peaking signal. The combined result is subjected to non-linear filtering and added to the luminance signal to form a horizontally processed luminance signal. A comb filter develops a vertical detail component representing differences between successive lines of luminance and combines the vertical detail component with the luminance signal to form a vertically processed luminance signal which is combined with the horizontally processed luminance signal to develop a fully processed luminanc…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.