Dahua DH-XVR54 L-I2 Series User Manual page 186

To lock the files to make it unable to be overwritten, select the files, and then click Lock.
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To add a mark to the file, select the files and then click Add Tag.
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5.11.2.2 Face Recognition
Face recognition applies to AI preview mode and smart search.
AI preview mode: Supports comparing the detected faces with the face database, and display the
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comparison results.
Smart search: Supports faces searching by faces attributes or portraits.
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If you select AI by device, then among face detection and recognition, IVS function, and video
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structuring, you can use one of them at the same time for the same channel.
Before enabling face recognition function for a channel, the face detection must be enabled first
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for this channel.
5.11.2.2.1 Face Database Management
You should create a face database for comparing the detected faces and the faces in the database. The
Device supports creating maximum 20 databases and registering 100,000 faces.
Creating a Face Database
Select Main Menu > AI > Database > Face Database Config.
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User's Manual