IQinVision IQanalytics - Manual (Page 10)

10
9. Ensure that the size of the objects that are to be tracked in the scene are not
too small. Object sizes have to be at least 5-10% of the scene for consistent
detection. If the objects are only a few pixels (people or vehicles), it will be
difficult to detect them consistently and will cause false alarms on most
systems.
10. Ensure that the object size is not too large – more than 40% of the scene. The
camera should not be too close to the objects being tracked.
11. We recommend you turn off AGC (Auto Gain), Auto IRIS and White Balance on
cameras. These fluctuate some times and cause notable scene changes. It is
possible to run the system with these settings ON, with lower sensitivity, if the
scene is stable and fluctuations are infrequent.
12. Camera lenses need to be kept clean and focused for best results.
Camera Zoom, FOV and Angle are important. The following sections address them
fully with examples.
Recommended Camera Positioning for Common Applications
1. Intrusion Detector
Camera must be at an angle looking down. Camera should be installed at sufficient
height to avoid occlusions. The object size should not be too large relative to the
scene. It is recommended that the size of any object entering the scene not exceed
50% of the scene size.
If the camera is used during the night, lighting reflections should be minimized
to avoid false detections. Light should be uniformly distributed in the scene (avoid
shadows). In addition, ensure no light sources are directed at the camera.
A camera that is pointed at an angle looking down is optimal for intrusion detection,
as seen below.