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Altera_Forum's avatar
Altera_Forum
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15 years ago

Overlay moving (live) graphics feed on video

I need to mix a live graphics image (Streaming into the FPGA) that has a special pixel value in places where VIDEO should show through. I know that the Alpha Blending Mixer can do this, if I can samp...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

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try this for liminance.

output = pixel/256 *(256-alpha) + graphics/256 *alpha

As for chrominance - good luck. It might be easier to convert it all into the RGB colour space before mixing if you want to mix in colour.

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Thanks, but I need ti create the alpha channel and I also need to see an example of how to connect the alpha channel in SOPC.

MIKE