PROBLEM TO BE SOLVED: To improve the accuracy of palm vein authentication.SOLUTION: A biometric authentication device 1 comprises: an image acquisition unit 111 for acquiring the image of a biological portion used in biometric authentication； a mesh generation unit 121 for generating, on the basis of three-dimensional shape information of the acquired image acquired by the image acquisition unit 111, three-dimensional mesh data of the biological portion from the acquired image； a mesh planarization processing unit 122 for converting the three-dimensional mesh data generated by the mesh generation unit 121 into two-dimensional mesh data while maintaining the distance between the vertexes of each mesh data in the three-dimensional mesh data； and a curved surface planarization processing unit 123 for the luminance value at each point of the biological portion in the acquired image into each point in the two-dimensional mesh data by a geometric conversion determined from a correlation between the three-dimensional mesh data before conversion by the mesh planarization processing unit 122 and the two-dimensional mesh data after the conversion.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】手のひら静脈認証の精度を向上させる。【解決手段】生体認証装置１は、生体認証に用いる生体部分の画像を取得する画像取得部１１１と、画像取得部１１１により取得された取得画像の３次元形状の情報をもとに、取得画像から生体部分の３次元メッシュデータを生成するMesh生成部１２１と、Mesh生成部１２１により生成された３次元メッシュデータを、３次元メッシュデータにおける各メッシュデータの頂点間の距離を保ちながら、２次元メッシュデータに変換するMesh平坦化処理部１２２と、前記Mesh平坦化処理部１２２による変換前の３次元メッシュデータと変換後の２次元メッシュデータとの対応関係から定まる幾何変換により、取得画像上の生体部分の各点の輝度値を、２次元メッシュデータ上の各点にマッピングする曲面平坦化処理部１２３とを備えた。【選択図】図１
