Adaptive method for Y-C separation in video signals
US6055024A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 2, 1998 |
| Grant date | Apr 25, 2000 |
| Priority date | — |
| Expiry date | Sep 2, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/78
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An adaptive method and system for processing luma and chroma signals from lines of a video signal. The invention includes an adaptive comb filtering algorithm that determines whether to average lines of video data based on the signal content. If two lines are dissimilar, a simple notch/bandpass system is used. The invention provides improved adaptive comb filtering performance at vertical transitions between high-luminance-detail areas and between other areas such as solid colors or flat gray or white fields by dynamically determining whether to average the chrominance information of the current video line with the chrominance information of the previous line, next line, both of such lines, or neither of such lines. In one aspect, the invention includes determining whether to average a current chroma value of a current video line with corresponding chroma values of the previous line, next line, or both of such lines, or neither of such lines; computing an output value for the current chroma value in response to such determination; determining a luminance correction from the current chroma value and the computed output value; and applying the luminance correction to a luma value cor…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.