Operation of the detection of moving against crowd flow is controlled by the following parameters:

1. Movement against a crowd – direction reversed to direction in which a crowd is moved in the video image. Direction of crowd movement is called the right direction.
2. Number of people in a crowd – minimal number of people moved in direction of crowd movement in which detection should trigger.

Detection will not function in case of number of people in a crowd moved in right direction is less than the Number of people in a crowd parameter.
If number of people moved in right direction is more or equal to the Number of people in a crowd, then:

• detection functions if number of people moved against a crowd is from 1 to 2 included;
• detection doesn't function if number of people moved against a crowd is 3 or more;
• detection doesn't function if there is no people moved against a crowd.

There will not new detection triggers while a person on which detection functioned is stayed in the monitored area.

Example. A steady flow of people goes against a crowd. In the monitored area only 1 or 2 persons move against a crowd. In this case only one trigger will happened when the first person will go against a crowd. New triggers will not happen until a flow moved against a crowd will not stopped.
If all people moved against a crowd are out of monitored area, i.e. in the monitored area there is only crowd moved in the right direction and new person moved against a crowd enter the area, then detection will function.