I remember seeing a stock screener that allowed you to draw a picture, and the screener would look for charts that matched the picture. Not futures, but ...
I'd hazard a guess that near the top you're looking for an uptrend that makes a pullback into a double bottom and a break upwards for a continuation of the uptrend.
Near the bottom it would be a downtrend making a pullback into a double top and breaking downwards for a continuation of the downtrend.