System and method for producing video effects on live-action video
US6069668A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1997 |
| Grant date | May 30, 2000 |
| Priority date | — |
| Expiry date | Apr 7, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/74
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital video effects system for producing live-action video effects in real time includes an address generator having a pair of 2-D tables for providing x-coordinate and y-coordinate offset values. A third 2-D table contains warp activation factors (activators) which are scaled by a clip and gain processing technique to produce scaled activators. The scaled activators are used to scale the x- and y-offset values which are then combined with the original raster-order addresses to produce frame buffer readout addresses. An output video signal is produced by an inverse mapping of the input frame buffer to the output. The 2-D tables provide control of the image on a pixel-by-pixel basis. The degree of scaling by the clip and gain unit varies with time so that the resulting readout addresses also vary with time. A video effect, therefore, is produced simply by adjusting the scaling of the clip and gain unit. Moreover, a variety of effects can be achieved simply by changing the various 2-D tables.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.