Adaptive architecture for video effects

• US 4,947,256 A
• Filed: 04/26/1989
• Issued: 08/07/1990
• Est. Priority Date: 04/26/1989
• Status: Expired due to Term

• Current Assignee: Grass Valley USA LLC (Vislink Technologies, Inc.)
• Original Assignee: The Grass Valley Group, Inc. (Belden Inc.)
• Inventors: Wood, David G. S., Baldassari, Mark
• Primary Examiner(s): Peng, John K.
• Application Number:
  US07/344,189
• Time in Patent Office: 468 Days
• Field of Search: 358/22, 358/181, 358/182, 358/183, 340/721, 340/734
• US Class Current: 348/578
• CPC Class Codes: H04N 5/262 Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects

Abstract

An adaptive architecture for video effects allows a transformed image from a digital video effects (DVE) system to be inserted at any desired point along a video path through a production switcher while maintaining strict timing reqirements between the digital video effects system and the production switcher. The transformed image from the DVE system is input to a primary input bus as well as to a fill video input of a dowstream keyer (DSK) for the production switcher. A key signal from the DVE system is input to an effects key input and a key input of the DSK for the production switcher. The DVE system has a genlock timing system that provides a variable output timing signal to synchronize the transformed image with the video of the production system at the desired point of insertion along the video path. The DVE system also has an output overlay mixer that passes the program video from the production switcher to the system output unless the insertion point is at the output of the production switcher, at which point the transformed video is overlaid on the program output. The desired insertion point is determined by a topology mode indicator included within the keyframes that are programmed to produce a desired video effect.

Claims

1. An adaptive architecture for video effects comprises:

a production switcher for combining a plurality of video input signals as a function of key input signals to produce a composited video signal having the combined video input signals in layers, the layering of the video input signals in the composited video signal being a function of the point along a video path through the production switcher at which the video input signals are combined;

a video effects system for transforming one of the plurality of video input signals to produce a transformed video signal, the transformed video signal being inserted into the video path for combination with other video input signals at a point that is a function of the desired layer within the composited video signal at which the transformed video signal is to appear; and

means for varying the timing for the transformed video signal so that the transformed video signal is synchronized with a video signal in the video path at the point where the transformed video signal is inserted into the video path.

2. An adaptive architecture as recited in claim 1 further comprises means for variably selecting the point at which the transformed video signal is inserted into the video path.

3. An adaptive architecture as recited in claim 2 wherein the selecting means comprises means for controlling the point on a keyframe by keyframe basis.

4. An adaptive architecture as recited in claim 1 wherein the video effects system comprises:

means for digitizing the one video input signal;

means for transforming the digitized one video input signal into a digitized transformed video signal; and

means for converting the digitized transformed video signal into the transformed video signal having a time delay with respect to a reference video signal that is determined by a variable timing signal from the varying means.

5. An adaptive architecture as recited in claim 4 wherein the video effects system further comprises means for overlaying the transformed video signal onto the composited video signal to produce a system output video signal.