The following events will prevent the OTS algorithm from working correctly:
- If a scene changes significantly such as caused by a camera movement or if the camera view was obstructed for a significant period. The system needs at least one hour of constant scenery.
- If there are too few viewers to compute a model of the scenery. Typically, VidiReports needs around 100 viewers detected so that the system can determine the average person size and movement path from which OTS numbers are generated.
- If the area being observed is too dark. In this case, the system cannot differentiate between people and the surrounding architecture, thus OTS data is too unreliable to be captured.
Before version 5.8.0, the 2 first events in this list would result in an OTS stuck at 0, but, since 5.8.0, the OTS algorithm will return a value even if these events occur.
It is recommended to update to version 7 and above.