Why Is the Data Returned by FRS Empty?

Symptom

The face in an uploaded image may be transverse or upside down.

Solution

1. Select a solid color background without any interference and ensure that the face in the image is clear.
2. The side face angle cannot exceed 30°, and the angle of head up or down cannot exceed 15°.
3. The face in the image must be a front face and must be vertical. If the face is transverse or upside down, rotate it and try again.