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In this dissertation , we focus on two related parts of a 3D face recognition system with wireless transportation . In the first part , the core components of the system , namely , the feature extraction and classification component , are introduced . In the feature extraction component , range images are taken as inputs and processed in order to extract features . The classification component uses the extracted features as inputs and makes classification decisions based on trained classifiers . In the second part , we consider the wireless transportation problem of range images , which are captured by scattered sensor nodes from target objects and are forwarded to the core components (i .e . , feature extraction and classification components ) of the face recognition system . Contrary to the conventional definition of being a transducer , a sensor node can be a person , a vehicle , etc . The wireless transportation component not only brings flexibility to the system but also makes the “proactive” face recognition possible .
For the feature extraction component , we first introduce the 3D Morphable Model . Then a 3D feature extraction algorithm based on the 3D Morphable Model is presented . The algorithm is insensitive to facial expression . Experimental results show that it can accurately extract features . Following that , we discuss the generic face warping algorithm that can quickly extract features with high accuracy . The proposed algorithm is robust to holes , facial expressions and hair . Furthermore , our experimental results show that the generated features can highly differentiate facial images .
For the classification component , a classifier based on Mahalanobis distance is introduced . Based on the classifier , recognition performances of the extracted features are given . The classification results demonstrate the advantage of the features from the generic face warping algorithm .
For the wireless transportation of the captured images , we consider the location -based wireless sensor networks (WSN ) . In order to achieve efficient routing perfor¬mance , a set of distributed stateless routing protocols (PAGER ) are proposed for wireless sensor networks . The loop -free and delivery -guaranty properties of the static version (PAGER -S ) are proved . Then the performance of PAGER protocols are compared with other well -known routing schemes using network simulator 2 (NS2 ) . Simulation results demonstrate the advantages of PAGER . |
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