The invention provides embodiments of real-time face detection, face tracking and face posture selection sub-systems in an embedded visual system. In one aspect, a recognition process of similar repeated dace images is disclosed by employing the sub-systems. The process includes following steps: receiving a determined best posture face image related to a tracked face when determining the tracked face disappears; extracting an image characteristic from the best posture face image; calculating a group of similarity values between the extracted image characteristic with each image characteristicin a group of stored image characteristics in a characteristic buffer, wherein the group of stored image characteristics are extracted from a group of pre-transmitted best posture face images; determining whether there is one value in the group of similarity values is higher than a preset threshold; and if not, transmitting the best face image to a server and storing the extracted image characteristic to the characteristic buffer.
ENHANCED FACE DETECTION AND FACE TRACKING METHOD AND SYSTEM FOR LIMITED RESOURCE EMBEDDED VISUAL SYSTEM