Requirements and recommendations for the Abandoned Objects Detection module🔗

For detecting the abandoned objects, it is required to provide the following conditions:

  • Static and reliable camera fixing.

  • View from the above, or perspective view from the above.

  • Absence of refocusing and changing image sharpness.

  • Absence of non-mobile or slow-moving objects in the frame, for example, trees or clerks sitting at their desks. Such objects in the frame may lead to false triggering of the detector. At the same time, the presence of a non-mobile object close to the abandoned object may result in the triggering of the detector since the abandoned object and the non-mobile object may incorporate into one moving area.

  • Absence of the light sources slowly changing their position in the frame.

The most favorable conditions are as follows:

  • Static background.

  • No windows in the frame.

  • Small quantity of moving objects.

  • Constant lighting; for example, light fixtures in the premises.

  • The abandoned objects are not blocked by other objects.

  • The abandoned object color differs significantly from the color of the background.

  • Absence or small number of the outstanding small-size objects.

Influence of the module’s settings:

  • Detection zones: if more than a half of the object is in the zone, the object is detected; if not, it is not detected.

  • Maximum dimensions: if both dimensions (width and height) are smaller than the set maximum dimensions, the object is detected; if at least one of the dimensions exceeds the set limitations, the object is not detected.

  • Minimum dimensions: if both dimensions (width and height) are larger than the set minimum dimensions, the object is detected; if a t least one of the dimensions is smaller than the set limitations, the object is not detected.

  • If one of the dimensions of the object is close to the set limitations, the probability of the detector’s triggering decreases.

Warning

Regardless of the zone size, the size of the object must be at least 3% of the frame height.

Since the current version of the module cannot determine the shifts of the objects (insignificant changes of the object’s position), such shifts will result in the triggering of the detector.

There are no more particular requirements to the frame’s parameters or the software motion detector’s settings.