Specifications
19
> Preset positions. Many PTZ cameras and PTZ dome cameras enable a number of preset
positions
, normally between 20 and 100, to be programmed. Once the preset positions have
been set in the camera, it is very quick for the operator to go from one position to the next.
> E-ip. When a PTZ dome camera is mounted on a ceiling and is used to follow a person in,
for example, a retail store, there will be situations when a person will pass just under the
camera. When following through on the person, images would be seen upside down without
the E-ip functionality. E-ip electronically rotates images 180 degrees in such cases. It is
performed automatically and will not be noticed by an operator.
> Auto-ip. PTZ cameras, unlike PTZ dome cameras, do not normally have a full 360-degree
continuous pan due to a mechanical stop that prevents the cameras from making a
continuous circular movement. However, with the Auto-ip functionality, a PTZ network
camera can instantly ip the camera head 180 degrees and continue to pan beyond its zero
point. The camera can then continue to follow a passing person or object in any direction.
> Auto-tracking. Auto-tracking is an intelligent video functionality that will automatically
detect a moving person or vehicle and follow it within the camera’s area of coverage. Auto-
tracking is particularly benecial in unmanned video surveillance situations where the
occasional presence of people or vehicles requires special attention. The functionality cuts
down substantially the cost of a surveillance system since fewer cameras are needed to
cover a scene. It also increases the eectiveness of the solution since it allows a PTZ camera
or PTZ dome camera to record areas of a scene with activity.
Although PTZ cameras and PTZ dome cameras may share similar functionalities, there are dif-
ferences between them:
> PTZ network cameras do not have a full 360-degree continuous pan due to a mechanical
stop. It means that the camera cannot follow a person walking continuously in a full circle
around the camera. Exceptions are PTZ cameras that have the Auto-ip functionality; for
example, AXIS 215 PTZ Network Camera.
> PTZ network cameras are not made for continuous automatic operation or so-called guard
tours where the camera automatically moves from one preset position to the next.
More on PTZ network cameras, which are available in mechanical or non-mechanical versions,
and PTZ dome network cameras is provided in the next sections.
NETWORK CAMERAS - CHAPTER 2