System for providing antialiased video overlays
US5568167A · kind A · utility
87Cited by
2References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 23, 1994 |
| Grant date | Oct 22, 1996 |
| Priority date | — |
| Expiry date | Sep 23, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/76
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A separate data stream allows encoding of an overlay image, which is to be superimposed on images of a video sequence. The pixels of the overlay image can be transparent or have a text color, a shadow color, or an intermediate color either between the text color and the shadow color, or between the shadow color and the color of the corresponding pixel in the underlying video image. The intermediate colors provide for antialiasing. In addition, a color selection circuit allows selection of the next color from a pool of 9 colors, using a 3-bit field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.