53
SLN-VIZNAS-IOT User Guide, Rev. 1.1, 10/2020
NXP Semiconductors
3.5.2 E-Lock vs. Door Access vs. UserID
Both the E-Lock and Door Access and app types have liveness detection and anti-
spoofing capabilities, however, the main difference between the two is a tradeoff
between max # of recognizable faces and power consumption.
Compared to the “Door Access” app type, the equivalent heavy/light E-Lock app can
recognize far fewer faces, but the advantage of using the E-Lock app type is that E-
Lock utilizes the IR camera for face recognition as opposed to the RGB camera. While
the RGB camera provides more feature data, thereby allowing recognition of a far
greater number of faces, RGB struggles in lower-light conditions where an IR camera
has a much easier time. Because of this fact, the IR camera has less reliance on power-
hungry illuminator LEDs that an RGB camera would require for the recognition process.
As a result, generally, the E-Lock app type is recommended in battery-powered use-
cases where continually running power-hungry LEDs could prove to be an issue,
draining a significant portion of the battery life.
The UserID app type, unlike the E-Lock and Door Access app types, does not have any
liveness detection/anti-spoofing features. The UserID app type is meant to replicate the
original SLN-VIZN-IOT kit which is no longer in active circulation. Unlike the original
SLN-VIZN-IOT kit, however, the remote registration and low power mode features of the
SLN-VIZNAS-IOT are fully functioning in this version of the UserID application. For
more information on the UserID app type, check out the
