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The threshold sets the minimum difference in a pixel's values between the reference frame and the frame being evaluated, in order for that pixel to flagged, ie be considered as having changed enough that it needs to be masked out.
The value ranges between 0 and 1, scaled appropriately to match 8-bit, 16-bit, or floating-point source imagery. At zero, even the slightest change will be flagged, while at one, even full-scale changes will be ignored.
A smaller value provides more sensitivity, to better ignore occluding objects even if they are relatively close in appearance. But a value that is too small will flag too many spurious pixels due to camera noise, lighting changes, and small shifts near image edges.
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