People Tracking and Identification System Based on RFID and Visual Techniques at the Entrance

碩士 === 朝陽科技大學 === 資訊工程系碩士班 === 101 === Recently, the RFID (Radio Frequency Identification) technology is widely used in many areas. Some studies combine the RFID and visual techniques to extend the application domains. In this study, a method is proposed to locate, identify, and track persons with a...

Full description

Bibliographic Details
Main Authors: Yu-Ming Chen, 陳又銘
Other Authors: Hsien-Chou Liao
Format: Others
Language:zh-TW
Published: 2013
Online Access:http://ndltd.ncl.edu.tw/handle/92588713774761178101
Description
Summary:碩士 === 朝陽科技大學 === 資訊工程系碩士班 === 101 === Recently, the RFID (Radio Frequency Identification) technology is widely used in many areas. Some studies combine the RFID and visual techniques to extend the application domains. In this study, a method is proposed to locate, identify, and track persons with active RFID tag while they passing through an entrance. The main challenge of this study is the unstable RSSI (Received Signal Strength Indication) values of an RFID tag. The RSSI information is also significant difference among tags. Firstly, a Kalman filter is used to smooth the received RSSI values. Then, an adaptive threshold of RSSI is designed. When the RSSI is larger than the threshold, it triggers the locating of the target person on the image. However, the located target may be wrong since the locating process is triggered too early and another person is coincidently passing the entrance. Therefore, an RSSI attenuation checking mechanism is designed based on the temporal features of the RSSI values while a person passing the entrance. The locating process will be restarted if the checking cannot pass. An experimental study is also designed to evaluate the performance of the proposed method. The results show that the implemented prototype based on the method can overcome the problem caused by the unstable RSSI values and achieve the purpose of this study to locate, identify, and track persons while they passing through the entrance.