Get Those Old Records Off the Shelf.
Sing It Loud
For many live event productions, frame accurate sync between a background and a foreground image source is critical. Previzion provide two HDSDI 4:2:2 video inputs. Input 1 is sent automatically to the keyer. Input 2 can either be sent to a video texture that is mapped onto background geometry, or routed to the ‘midground’ and placed just behind the foreground image in the compositing stack.
The two HDSDI sources must be of matching formats, and must be genlocked together to ensure simultaneous acquisition. Once the two incoming frames are captured, they are kept locked together with their associated tracking data through the remainder of the pipeline, ensuring precise sync is maintained.
In this way, the background virtual image can be sourced from any video device that can generate a standard HDSDI signal, including recording decks, live video cameras, Blu-Ray players, and even satellite feeds!
Intelligent Processing
When Input 2 is routed to the midground, which would be the typical case for bringing in a character feed from Motionbuilder, a simple keying process is applied. If the pixel value is RGB 0 0 0, the pixel is not displayed in the final composited image. Otherwise, the pixel value is retained and composited with the foreground image. In this way, CG characters driven by live motion capture data can be composited into Previzion’s scene in real time.