Nonlinear vertical bandwidth expansion of video signals
US5940141A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 1997 |
| Grant date | Aug 17, 1999 |
| Priority date | — |
| Expiry date | May 13, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/0132
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
(1) The analog or digital components (such as RGB, Y/I/Q, Y/U/V, Y/R-Y/B-Y, Y/Cr/Cb, etc.) of a compatible standard-bandwidth 2-1 interlaced television signal, an analog signal, such as a standard NTSC or television signal or a standard format digital signal, such as a digital representation of a standard NTSC or television signal or a digital video signal in one of the 2:1 interlaced CCIR 601 hierarchical formats, is converted from interlaced to progressive scan, the progressive scan frame rate corresponding to the interlaced scan field rate and each progressively scanned frame having twice as many scan lines as in each interlaced field, the conversion often referred to as "line doubling;" (2) the line rate of the progressively scanned signal is increased by interpolation, including appropriate postfiltering (if the line rate of the progressively scanned signal is doubled, the overall effect is often referred to as "line quadrupling" or "line tripling" when the progressively scanned signal scan rate is multiplied by 1.5); and (3) the resulting signal is spectrally expanded in the vertical domain. Vertical bandwidth enhancement simulates a wide bandwidth vertical detail signal. The…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.