S?bastien Bourdeauducq wrote:
> (1) "Differentiate" the camera signal. Instead of drawing the direct
> picture from the camera, draw the difference between the last two
> frames, e.g. defined as:
> diff(x,y).c = |f1(x,y).c - f2(x,y).c| for each color channel c=r,g,b

That sounds interesting. It may also be useful to be able to
pick something between these values, e.g.,

value(x,y).c = a*f2(x,y).c+(1-a)*diff(x.y).c;

For a = 1, you get the new frame. For a = 0, you get deltas. For
a in the middle, you get the new frame with changes highlighted.

- Werner
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