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Ear acoustic authentication is a new biometrics method and it utilizes thedifferences in acoustic characteristics of the ear canal between users.However, there have been few reports on the factors that cause differences inthe acoustic characteristics. We investigate the relationship between ear canalshapes and acoustic characteristics in terms of user-to-user similarity. Weused magnetic resonance imaging (MRI) to measure ear canal geometry. As aresult, the correlation coefficient between shape similarity and acousticcharacteristic similarity is higher than 0.7 and the coefficient ofdetermination is higher than 0.5. This suggests that the difference in theshape of the ear canal is one of the important factors.

A Study on the relationship between the geometrical shapes and the biometrical acoustic characteristics of human ear canal