User's Manual

Face Recongition
5
5.5.1 Photo Requirements
For face recognition to work, it is required for the photos to meet the following criteria:
 Each photo should consist of only one face.
 Size of the face in the photo is around 120 ~ 150 pixels.
 The file size of the photo cannot exceed 350 KB.
 Only JPG / JPEG format is supported.
 Make sure the face of the person does not occupy more than 50% of the image.
See the examples below:
Best Example Example of Failure - 1 Example of Failure - 2
The face occupies 50% of
the image. The size of the
person’s face is around
120 ~150 pixels.
The face occupies more
than 50% of the image.
The size of the person’s
face is less than 120 pixels.
Figure 5-11
The accuracy of the face recognition can be improved by conforming to the suggestions
below:
 Enroll 5 or more photos for each person with different angles
 Make sure the lighting is sufficient to reduce shadows on faces.
 Avoid glare from the glasses that obscures the eyes.
 Take the photo of the person from a distance of about 1 ~ 1.5 meters (3.2 ~ 4.9 feet)
away from the camera to minimize image distortions.
70