People counting function provides the statistics of line crossing persons or objects in a specified time period. And there are two statistics type, i.e., real-time statistics and periodic statistics.
Real-time statistics (starts calculating after clearing caused by device reboot, manual clearing or auto clearing at zero time point of each day) will be uploaded when the count changed. If the count changed frequently, this statistics will update per second.
Increased number in the configured statistics period. The update frequency is the configured statistics period (the default period is 15 minutes, shortest period is 1 minute, and longest period is 60 minutes).