Dahua DH-XVR54 L-I2 Series User Manual page 215

If you only selected Human Body Detection and did not select Face Detection in

"5.11.1.4.1 Configuring Video Structuring", there will be only human body features
displayed in the results.
If you selected Human Body Detection and Face Detection in "5.11.1.4.1 Configuring

Video Structuring", and there is any human face appears in the video, there will be extra
face features displayed in the results.
Human body detection
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User's Manual