Match tolerance

Hi
I want to know what is meant by the match tolerance in TRACKER of fusion software?
When we select best match to track, then we have to set value of match tolerance.
what calculation are happening when I select the lower value or higher values?
Thank you

It controls how much the pattern is allowed to change before the Tracker stops itself. A high tolerance means the Tracker will keep going for longer, but there is a higher chance for it to drift or jump off target.

See the Tool Reference Guide, page 659, under the heading "Best Match."

Thank you so much Sir
My confusion is clear now