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changes.mady.by.user Alina Luchkina

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Description

The Face Detection detector VL generates an event every time a face is captured in the frame.

The Axxon One database stores all faces in binary form:

  1. All captured faces are stored as biometric vectors (see Face search) in the t_face_vector table, and their corresponding capture events are stored in the t_json_event table.
    Note
    titleAttention!

    The default storage depth of face vectors is 24 hours. To specify the storage depth of face vectors, you must add the NGP_FACE_VECTORS_IN_RAM_DEPTH_HOURS system variable (see Creating system variable). The values of the variable are specified in hours.

    For example, if you set NGP_FACE_VECTORS_IN_RAM_DEPTH_HOURS = 1, face vectors are deleted from RAM in one hour. If the value of the NGP_FACE_VECTORS_IN_RAM_DEPTH_HOURS variable isn’t set, the storage depth of face vectors is 24 hours.

  2. All reference faces from the lists (see see Faces) are stored in the t_face_listed table.
Note
titleAttention!

When the number of faces in the database increases, the statistical error increases: the more faces in the database, the more often similar faces are recognized when searching in the archive. Accordingly, the degree of similarity when comparing the reference face with the captured face decreases.

This error is relevant if:

  1. The Video stream and scene requirements for the Face Detection detector VL and its sub-toolsdetectors are met.
  2. The database contains over a million faces.

Example of the error calculation results:

The mugshot dataset (good quality photo), 12 million faces in the database, and probability of false matching is 0.003%. With these initial data, the researchers obtained an identification error of 0.81%.

LicensingTo operate the detection tooldetector, contact an AxxonSoft manager and get a license file (see Types of licenses)
Add-ons

For the Face Detection VL detector VL to work, you must install VL Face Recognition Pack and VL SDK Pack (see Installing DetectorPack add-ons).

Note
titleAttention!

You can install only one Face one Face Recognition Pack:  VA Face Recognition Pack, VI VA Face Recognition Pack, TV Face Recognition Pack, or VL Face Recognition Pack. You cannot install several packages in the same system.

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