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Quadro SDI Output PG-03776-001_v06

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7 VIDEO COMPOSITING

The Quadro SDI supports programmable 2D compositing. This operating mode

combines the image data from the incoming video stream with the GPU-rendered image

based upon the values in a third image known as a matte or key channel. The Quadro

SDI supports the following compositing methods.





Note: 2D compositing is any supported when the signal format of the incoming

video matches the outgoing signal format and the outgoing SDI video signal is

genlocked to the input signal. Scaling or retiming the video input to match the

video output signal format is not supported.

7.1 ALPHA COMPOSITING

In the case of alpha compositing, the application provides the key / matte channel per

field / frame in the alpha channel of the OpenGL graphics stream. When the application

enables alpha compositing via the API, the Quadro SDI simply executes the function

below to compute the final pixel color.

output color = input video color * (1 - alpha) + input graphics color * (alpha)

When the value of the key or matte is strictly 1 or 0, the compositing is complete

replacement. When the key value is between 0 and 1, the two images (video and

graphics) would be blended. The above formula is executed for each and every pixel in

the SDI output stream.

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SDI Technologies iH30 Especificações Página 47