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    188宝金博页面版: The Pluses and Minuses of Obtaining Measurements from Digital…

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    内容提示： V.G. Duffy (Ed.): Digital Human Modeling, HCII 2009, LNCS 5620, pp. 681–690, 2009. ? Springer-Verlag Berlin Heidelberg 2009 The Pluses and Minuses of Obtaining Measurements from Digital Scans Ravindra S. Goonetilleke 1 , Channa P. Witana 1 , Jianhui Zhao 2 , and Shuping Xiong 3 1 Department of Industrial Engineering and Logistics Management, Hong Kong University of Science & Technology, Clear Water Bay, Hong Kong 2 Computer School, Wuhan University, Wuhan, Hubei, PR China 3 Department of Industrial Eng...

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    V.G. Duffy (Ed.): Digital Human Modeling, HCII 2009, LNCS 5620, pp. 681–690, 2009. © Springer-Verlag Berlin Heidelberg 2009 The Pluses and Minuses of Obtaining Measurements from Digital Scans Ravindra S. Goonetilleke 1 , Channa P. Witana 1 , Jianhui Zhao 2 , and Shuping Xiong 3 1 Department of Industrial Engineering and Logistics Management, Hong Kong University of Science & Technology, Clear Water Bay, Hong Kong 2 Computer School, Wuhan University, Wuhan, Hubei, PR China 3 Department of Industrial Engineering and Management, Shanghai Jiao Tong University, Shanghai, PR China ravindra@ust.hk Abstract. Digital scanners are commonplace and are used in many different applications to obtain three-dimensional shapes and linear and circumferential measurements. Even though scanners can be highly accurate, measurements obtained from scanners can vary depending on how an object is scanned, aligned and processed. In this study, we examined the effect of three different alignment methods of foot scans and their effects on ten different measure-ments. Variations among methods in capturing foot length are relatively small relative to arch length. The foot girths can be quite sensitive to the registration process depending on the complexity of the algorithms used. As expected, lin-ear and girth measurements based on anatomical landmarks will always be in-dependent of any registration process and are thus good ways to obtain repeat-able measurements. Keywords: Scanning, foot, measurement, registration, alignment, brannock, width, girth. 1 Introduction The length and sometimes the width of feet are used to select footwear. There are many studies on foot anthropometry that describe different techniques to measure critical dimensions on feet. These include Freedman et al. [3], Hawes and Sovak [4] and Kouchi [5]. With the availability of cheap computer power and powerful scanning technologies, many researchers are using automatic methods to obtain foot measure-ments. The required measures can be obtained from the relevant points in the scanned data using feature recognition techniques or by placing markers and identifying ana-tomical points [6, 8]. In recent years, there has been an exponential growth in laser scanner technologies for varying applications that claim accuracy within 1 mm. The accuracy of the scanner itself can vary depending on the object that is scanned and the method used for scanning. Even though scanner accuracy can be within 1 mm, one fundamental issue that has not been studied in relation to foot anthropometrics is the measurement axes. Witana

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