Spatial scan converter with vertical detail enhancement
US5016103A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 17, 1989 |
| Grant date | May 14, 1991 |
| Priority date | — |
| Expiry date | Aug 17, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S348/91
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A scan arrangement supplies real line video pixel information to an input demultiplexer that samples the pixels at a frequency of 4fc (fc=color subcarrier) and sequentially writes the sampled information in a series of line memories at an H (horizontal frequency) rate. A plurality of output multiplexers read information from the line memories at a 2H rate and supply it to a video interpolator where interpolated lines are produced based upon immediately adjacent real lines. The video output is at a 2H rate and consists of alternate real and interpolated lines in two successive fields. A vertical detail enhancement circuit combines pixel data from each set of three successive lines (upper (u), lower (l) and middle (m) lines) in accordance with the formula 2m-(u+1), to develop a vertical detail component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.