One other way is go even lower with the integrator.

Build an integrator that will integrate an entire frame and then watch
it's output.  It is the simplest one possible, but with lower
sensitivity.

I've seen such a motion detector done with transistors only.

=====
ing. Andrei Boros
Centrul pt. Tehnologia Informatiei
Societatea Romana de Radiodifuziune

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