People Counting with Video Turnstile

Video Turnstile Installation Guide
People Counting Systems from Biodata Ltd

Installation Guide > Testing the System > Checking the counting accuracy - individuals

Checking the Counting Accuracy - Individuals

Send a person through the counting zone and follow the steps below to make sure that the individual is counted properly. When you've done that send the person through the other way and check again. Do this for a few different people, one or two at a time. Finally monitor 50 or a 100 transits of one or two people. (When you have successfully done this, perform similar steps for groups of people.)

  1. Connect a monitor, hand-held TV or frame grabber.
  2. Send a person through the counting zone. Check that the individual causes one, and not two, counts—watch the count lights on the VT or the flashing zone lines.
  3. From the Select VT tab click the Tune button. The VT Tuning screen appears and the diagnostic time is set to zero. (The diagnostic time gives an indication of how long ago an event occurred. It is not absolutely accurate but designed to let you see when events occurred relative to each other.)
  4. Depending on the direction the person walked, click the Analyse Single Transit Up or Analyse Single Transit Down button. You are asked some questions about the person, so that the system can make recommendations of settings to use.
    • Was the person going up screen or down screen?
    • Were they an adult, a large adult, a small adult or a child?
    This helps the software determine the expected range of person size.
  5. At the bottom of the screen the software shows a list of the 10 most recent events. It marks in green the one it considers to be the transit of the person. Other events might include shadows or a door opening. This lets you see exactly what the system is detecting as a person.
  6. The software makes some recommendations in the Suggested column of the VT settings grid. To accept these click the Apply to VT button. You can edit the suggestions if you wish.
  7. After adjusting your settings, send a person through the other way and repeat points 4-6 above. Do this a few times for each direction, sending one or two people through each time. Make sure that the system is counting correctly with no double-counts and that two people side-by-side are not counted as one.
  8. If people going in one direction are less easily counted this is usually because of different lighting conditions on the two sides of the zone. Try lowering the value of the ThresholdLevel to help detection against darker backgrounds.
  9. The Event Summary, at the bottom of the screen, helps you identify the cause of poor counting.

Next: Identifying the Cause of Poor Counts.