Face recognition method and electronic device using same

An electronic device, comprising:

• a memory device, storing pre-registration information and real-time registration information;
• and
• a processor, coupled to the memory device, the processor obtaining a video stream to recognize a face in the video stream and performing the following steps:
• obtaining face information from an image frame in the video stream;
• determining whether a first similarity between pre-registration information and the face information is higher than a first similarity threshold;
• determining that face recognition is successful if the first similarity is higher than the first similarity threshold, and updating real-time registration information with the face information of the image frame;
• and
• determining that face recognition fails if the first similarity is lower than the first similarity threshold, and then determining whether a second similarity between the real-time registration information and the face information is higher than a second similarity threshold, wherein the real-time registration information is generated based on face information corresponding to another image frame extracted prior to the image frame in the video stream, and the second similarity threshold is higher than the first similarity threshold.