Why are the photos taken by Meizu mx4 front camera mirrored?

Meizu MX4 and flyme4 systems of other types of mobile phones all adopt the "mirror image" mode on the front camera. The reason is that the photos taken when taking selfies are opposite to those taken when people look in the mirror. Through mirror image transformation, the people and faces in the shot photos will be displayed normally without mirror image editing.

If the user doesn't want to be mirrored, a mirror switching button is provided in the lower left corner of the front camera, as shown in the figure below. Every time you click this button, the left-right relationship of the photo will be reversed.