General Preferences¶
To configure the generic confidence threshold for face verification, confidence threshold for episodes, thumbnail JPEG quality, and automatic events/episodes cleanup, navigate to the Preferences tab. Click General. After you are finished, click Update.
In this section:
Generic Confidence Threshold¶
FindFace Security verifies that a detected face and some face from the dossiers belong to the same person (i. e. the faces match), based on the pre-defined similarity threshold. The default threshold is set to 0.739. If necessary, you can change the generic threshold.
Note
The higher is the threshold, the less are chances that a wrong person will be positively verified, however, some valid photos may also fail verification.
Tip
You can configure the confidence threshold individually for each camera, camera group, and watch list.
Important
The default generic confidence threshold is optimal for the majority of recognition cases. We do not recommend changing it on your own. Be sure to consult with our technical experts by support@ntechlab.com.
Confidence Threshold for Episodes¶
To construct an episode, the system searches the biometric database for recent events with similar faces with a pre-defined similarity threshold. The default threshold is set to 0.689, which is considered as optimum. If necessary, you can change this value. Be sure to consult with our technical experts prior (support@ntechlab.com).
Thumbnail JPEG Quality¶
Subject to JPEG quality, thumbnails may take up a significant amount of disc volume. Use the General tab to configure the parameter.
Automatic Event And Episode Cleanup¶
Use the same tab to schedule purging old events and related episodes from the database on a regular basis. You can purge matched and unmatched events/episodes on different schedules, as well as purge only full frames for matched and unmatched events/episodes.