PROBLEM TO BE SOLVED: To provide a biometric authentication device capable of appropriately selecting a registered user to be a collation object even when a selection feature amount is not extracted for selecting a registered user to be a collation object in the 1:N authentication system.SOLUTION: A biometric authentication device 1 comprises: a selection feature amount evaluation part 27 which determines whether or not a selection feature amount can be extracted on the basis of quality of a part including biometric information in a biometric image on which the part including the biometric information is picked up, and causes a selection feature amount extraction part 28 to extract a selection feature amount from the biometric image when determining the selection feature amount can be extracted, on the other hand, causes an alternative feature amount extraction part 29 to calculate an approximate value of a selection feature amount from the biometric image when determining the selection feature amount cannot be extracted a selection part 34 which selects a registered user having a selection feature amount similar to the selection feature amount or the approximate value of the selection feature amount of the user from among a plurality of registered users and a collation part 35 which collates collation data of the selected registered user and collation data of the user.COPYRIGHT: (C)2014,JPO&INPIT【課題】1:N認証方式において、照合対象とする登録利用者を選択するための選択用特徴量を抽出できない場合にも、照合対象となる登録利用者を適切に選択可能な生体認証装置を提供する。【解決手段】生体認証装置1は、生体情報を含む部位が写った生体画像における、生体情報を含む部位の品質に基づいて選択用特徴量を抽出可能か否か判定し、選択用特徴量を抽出可能と判定した場合には選択用特徴量抽出部28に生体画像から選択用特徴量を抽出させ、一方、選択用特徴量を抽出不能と判定した場合には、代替特徴量抽出部29に生体画像から選択用特徴量の近似値を算出させる選択用特徴量評価部27と、複数の登録利用者のうち、利用者の選択用特徴量または選択用特徴量の近似値と類似している選択用特徴量を持つ登録利用者を選択する選択部34と、選択された登録利用者の照合用データと利用者の照合用データとを照合する照合部35とを有する。【選択図】図3
