10-24-2004

The threshold levels don't seem to make *that* much of a difference.

Neither does that alpha filter slider. I've been tracing the linkages and I think the threshold has to do with how often the system does a live "reset" to pick new points to track.

Looked up alpha filter in the eyesWeb documentation; it had this to say:

"This block performs alpha-filtering on the input stream according to the following formula:

y(sub i) = y(sub i-1) + (alpha)(x(sub i) - y(sub i-1))

where x(sub i) is the current input, y(sub i) and y(sub i-1) are respectively the current and previous outputs, and (alpha) is the value of the Alpha parameter. Note that if the current input is not valid, accordingly the output will be set as invalid."

The ramifications are staggering. I hope whoever is reading this is as ecstatic as I am about that.