Concealing temporal shift when using a digital video effect system with a video switcher
US6259488A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 22, 1999 |
| Grant date | Jul 10, 2001 |
| Priority date | — |
| Expiry date | Jul 22, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/268
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of concealing temporal shifts when a digital video effects system is used with a video switcher adds a mixer to the digital video effects system to mix the input to and output from the digital video effects system if the image to be transformed is on-screen at the beginning of the effect. An input video signal from a keyer in the video switcher is switched by an effects send/return matrix to the inputs of the digital video effects system and the mixer, and the output from the mixer is returned to the effects send/return matrix for input to the mix/effects stage of the video switcher. When the digital video effects system is bypassed, a delay circuit is used in the bypass path of the effects send/return matrix, the delay time equaling the processing time of the mixer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.