Metadata is information that describes object-related content in the camera FOV.

In Axxon Next metadata can be obtained in two ways:

  1. By analyzing video stream on Server by detection tools.
  2. By receiving metadata from camera built-in analytics (see Embedded Detection Tools). 

To extract metadata from video, you have to de-compress and analyze the video stream which, increases the Server's workload, thus limiting the number of available camera channels.

The following tools are used for server-side analysis and metadata generation:  

  1. Object Tracker.

  2. Neural Tracker.

    Object tracker and Neural Tracker generate metadata containing the following information about moving objects in FOV: object type, position, size and color, motion speed and direction, etc.


  3. VMD.

    VMD generates less accurate data. It does not detect object type and color.


  4. Face detection tools.

    Face detection metadata contains facial bounding boxes and their positions, as well as facial vectors.


  5. Automatic Number Plate Recognition (LPR/ANPR) tools.

    ANPR metadata contains license plate bounding boxes and their positions, as well as vehicle registration numbers.


  6. Pose detection.

    Metadata from pose detection tools contains information on positions and pose (skeleton) of all people in FOV.


  7. Equipment detection tool (PPE)

    Equipment detection metadata contains information about the position of all the people in FOV.


The metadata is used for the following system options:

Option

Required source of metadata

Scene Analytics

Object Tracker, Neural Tracker, built-in detection tool, or VMD.

Forensic search MomentQuest

Object Tracker, Neural Tracker, built-in detection tool, VMD, Face detection tools, Automatic Number Plate Recognition (LPR/ANPR) tools, Pose detection tools, Equipment detection tool (PPE).

Face search

Face detection tools.

LPR search

Automatic Number Plate Recognition (LPR/ANPR) tools.

TimeCompressor

Object Tracker, Neural Tracker, built-in detection tool, or VMD.

Tag&Track Pro

Object Tracker, Neural Tracker, built-in detection tool, or VMD.

Object tracking

Any

Autozoom

Any


If a camera uses several sources of metadata, the required source is selected automatically, except for MomentQuest.

To perform face/license number searches, only metadata from corresponding detection tools is used.

Metadata files are stored as files in the object trajectory database in the local Server directory that was selected when installing Axxon Next (see Installation) in the vmda_db\VMDA_DB.0\vmda_schema subfolder.

If necessary, you can place metadata on any available network storage (see Configuring storage of the system log and metadata).