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SLN-VIZNAS-IOT User Guide, Rev. 1.1, 10/2020
NXP Semiconductors
The following table describes the different messages and the associated descriptions.
Abbreviation
Definition
dt
Time taken to detect face
rt
Time taken to recognize face
sim
Predictive accuracy/confidence value of face rec
face_id
Internal face database identifier
Table 4: Verbose Mode Abbreviation Table
In addition to debug logging over serial, enabling
“verbose 3”
will also display some
useful on-screen information as well that can be helpful when troubleshooting
registration/recognition issues. An example can be seen in the images below:
NOTE: Without any registered users, the on-screen debug info will not update until a registration
has been triggered. This is because the inference engine does not attempt to recognize any faces
if they are none currently registered.
Figure 20: On-screen Info for Registering Face
In the above example, registration is taking place, but according to the on-screen
debugging info, although the face has passed the blurriness check (hence
“blur: 0”
), the
“front face check” has passed (hence
“front: 1”
), and the RGB liveness check has
passed (hence
“rgbLive: 1”
), the IR liveness check has not passed (hence
“irLive: 0”
).
This would suggest that there may be an issue with the IR camera
– likely a lighting issue.
