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Metadata is any accompanying data to any basic information. Metadata refers to additional information about the content or object. It reveals information that describes object-related content in the camera FOVabout the attributes and properties that characterize an entity, allowing you to automatically search and manage it in large information flows.
In Axxon One,metadata you can be obtained get metadata in two ways:
- By analyzing video stream
- on Server by detection tools
- the server by detectors (see General information about detectors and their sub-detectors).
- By receiving ready metadata from the embedded camera embedded
- analytics (see Embedded Detection Tools
- General information about embedded detectors).
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To get metadata from video, you have to de-compress and analyze the video stream, which increases the load on the Server, thus limiting the number of available camera channels. |
The following tools are used for the Server-side analysis and metadata generation:
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, video is decompressed and analyzed, which leads to a heavy load on the server and limits the number of cameras that you can use on it. |
Metadata are VMDADB files and are stored in the object tracks database. Path to the metadata folder: <Local directory of the server selected when installing Axxon One (see Installation)>\vmda_db\VMDA_DB.0\vmda_schema
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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.
VMD.
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VMD generates less accurate data. It does not detect object type and color. |
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Face detection metadata contains face bounding boxes and their positions, as well as face vectors. |
License Plate Recognition and Vehicle Recognition detection tools.
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ANPR metadata contains license plate bounding boxes and their positions, as well as vehicle registration numbers. |
If necessary, you can place metadata in network storage (see Configuring storage of the system log and metadata). |
The following detectors are used for the server-side analysis and metadata generation:
| Detector | Possible information about an object contained in metadata from the detector | |||||
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| Neural tracker |
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| Object tracker | ||||||
| Human tracker VL | ||||||
| Stopped object detector |
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| Motion detector |
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| Face detector VA |
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| Face detector TV | ||||||
| Face detector VL | ||||||
| License plate recognition BRS |
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| License plate recognition IV | ||||||
| License plate recognition RR | ||||||
| License plate recognition RR—Search in archive | ||||||
| License plate recognition RR—Parking | ||||||
| License plate recognition VT | ||||||
| Vehicle recognition XR | ||||||
| Vehicle recognition RR |
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Human pose detector and its sub-detectors:
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| Equipment detector |
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| Equipment detector VL | ||||||
| Barcode detector |
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Metadata
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Metadata from pose detection tools contains information on positions and pose (skeleton) of all people in FOV. |
Personal protective equipment detection tools.
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Equipment detection metadata contains information about the position of all the people in FOV. |
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Metadata from the Barcode Detection contains information about the contents of all barcodes in the frame. |
The metadata is used for the following system options to work:
Option | Required source of metadata |
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Object Tracker, Neural Tracker, Embedded Detection Tools, VMD, Face detection tools, License Plate Recognition and Vehicle Recognition detection tools, Pose detection tools, Personal protective equipment detection tools
License Plate Recognition and Vehicle Recognition detection tools
Object Tracker, Neural Tracker, Embedded Detection Tools, or VMD
Object Tracker, Neural Tracker, Embedded Detection Tools, or VMD
Any
Any
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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. |
By default, metadata is stored as files in the object tracks database in the local Server directory that was selected when installing Axxon One (see Installation) in the vmda_db\VMDA_DB.0\vmda_schema subfolder.
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Overview
Content Tools