A big threshold will lead to incomplete merging of the regions belonging to the object, while a small threshold can easily cause over-merging, i.e., some object regions are merged into the background
. Moreover, it is difficult to judge when the region merging process should stop.
Apparently, the foreground pixels are useless in background modeling and if the foreground pixels stay longer, it would be merged into the background
, causing the missing detection.
"Everything around it was very brightly colored, so it just merged into the background
. So we went white and neutral with that packaging because it stood out just because it was really different."
The first limousine to arrive discharged several men in dark suits, who promptly merged into the background