Chroma key

TELE Info software together with Stream ALPHA Plus PCI-E and Stream WIND SDI II cards can now provide a rear projection (chroma key) with an option of adding various effects, titles, animation and graphics over the resulting video signal. The system works in real time, which is essential in broadcasting studio conditions. It operates by placing the object of your video filming between the two layers of computer graphics.

chroma key		front (top) layer		on air
		background (animation or video clips)

•  You can use any computer graphics (static images, dynamically varying compositions and animations) or video clip as a back layer (background). The background behind the actor can also change in real time, for example, if it is animated or if the script implies a transition from one image to another with the use of a special effect. In the meantime, the object of the video filming in the studio is placed against a blue or green background and is being “cut out” due to the chroma key effect. You will no longer need expensive background scenes, all the imaginary background can be created on a computer.
   
• The titles, crawls containing different incoming messages or information on-the-fly, computer graphics and animations are set as a front (top) layer (in the Logo Editor of TELE/TELE Info or SMS Terminal software), which is overlayed over the object of the video filming with controllable transparency (alphachannel). On a program level the quantity of graphic layers can be unlimited, restricted only by the computer processing power. The output of a picture on the top layer can be synchronized with the output of a picture on the background (for example, a change of the weather chart images).