Electronic apparatus operated by head movement and operation method thereof

An electronic device, configured to make a screen to display a plurality of image frames, comprising:

• an image capturing device;
• a storage device, storing a plurality of modules;
• and
• a processor, coupled to the image capturing device and the storage device, configured to execute the modules in the storage device to:
• configure the screen to display a plurality of marker objects at a plurality of predetermined calibration positions;
• configure the image capturing device to capture a plurality of first head images when a user is looking at the predetermined calibration positions;
• perform a plurality of first face recognition operations on the first head images to obtain a plurality of first face regions corresponding to the predetermined calibration positions;
• detect a plurality of first facial landmarks corresponding to the first face regions;
• calculate a plurality of rotation reference angles of the user looking at the predetermined calibration positions according to the first facial landmarks;
• configure the image capturing device to capture a second head image of the user;
• perform a second face recognition operation on the second head image to obtain a second face region;
• detect a plurality of second facial landmarks within the second face region;
• estimate a head posture angle of the user according to the second facial landmarks;
• calculate a gaze position of the user on the screen according to the head posture angle, the rotation reference angles, and the predetermined calibration positions;
• and
• configure the screen to display a corresponding visual effect according to the gaze position.