[Elphel-support] mono video output postprocessing

[Gergely Debreczeni]

Hello,

Now we use our stereo camera in mono mode, so the resulted
8bit grayscale video's pixels corresponds to the color value of the CCD
in

 G G
 R B

layout - if I'm right.
I'm just wondering: Is there any easy way (preferably in Linux)
to convert this format into a video of half size, half width where one pixel
corresponds to some function (intensity/average/etc..) of the above four pixel ?

I was looking for some filter in ffmpeg, but found none which could perform
this task.

thanks again for your help,
Gergely
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