what is a Blob in people counter?

Hi,

       In PPLCNTR configuration Tab on the GUI, a control called Foreground Bob is there. What is the use of this control. If I set 1 (enabled), then in the captured video some green color boxes are present. What is that box says and what is the use if it? The output of my application is as in fig. Please find the attachment .

Thanks and regards,

Esakki