Face tracking method and electronic device

A face tracking method, applicable to an optimization thread, the method comprising:

• determining a current facial identity vector used by a tracking thread as an initial facial identity vector upon invoking the optimization thread;
• acquiring a first keyframe data set, wherein the first keyframe data set is a data set updated by the tracking thread upon performing face tracking, and the first keyframe data set comprises face tracking data;
• acquiring optimized face tracking data by optimizing the face tracking data in the first keyframe data set based on the initial facial identity vector;
• acquiring an optimized facial identity vector by performing iterative optimization on the initial facial identity vector based on the optimized face tracking data;
• upon each iteration, determining, based on the optimized facial identity vector and the initial facial identity vector, whether an iteration stop condition is satisfied;
• in response to the iteration stop condition being satisfied, making the tracking thread determine, in response to receiving the optimized facial identity vector, a received facial identity vector as the current facial identity vector by sending the optimized facial identity vector to the tracking thread;
• in response to the iteration stop condition being not satisfied, making the tracking thread update, in response to a second keyframe set of a second keyframe data set being a non-empty set, the second keyframe data set to the first keyframe data set upon receiving a clear instruction by sending the clear instruction for clearing video frame in the second keyframe data set to the tracking thread;
• and
• determining the optimized facial identity vector as the initial facial identity vector, and returning to the process of acquiring the first keyframe data set.