PROBLEM TO BE SOLVED: To provide a biometric authentication device which performs stable extraction of a region of interest.SOLUTION: A biometric authentication device which performs biometric authentication by detecting biological information from a biological photographic image comprises a palm region extraction section 54 which extracts a region of interest from a biological image on the basis of the biological photographic image. The palm region extraction section has: a weight map generation section 106 which calculates a luminance gradient of each region of the biological image and generates a weight map in accordance with the luminance gradient of each region in a manner that assigns a large weight to the region with a low luminance gradient and a low weight to the region with a high luminance gradient a luminance distribution estimation section 108 which generates a luminance distribution estimation image by applying the weights on the weight map to the biological image and a luminance correction section 110 which outputs a luminance correction image with the biological image corrected on the basis of a comparison of image data between the biological image and the luminance distribution estimation image.SELECTED DRAWING: Figure 5COPYRIGHT: (C)2017,JPO&INPIT【課題】安定した関心領域抽出を行う生体認証装置を提供すること。【解決手段】生体撮影画像から生体情報を検出して生体認証を行う生体認証装置において、前記生体撮影画像に基づく生体画像から関心領域を抽出する手のひら領域抽出部54を有し、前記手のひら領域抽出部は、前記生体画像の各領域の輝度勾配を算出し、各領域に輝度勾配に応じて、輝度勾配の小さい領域に大きな重みづけをし、輝度勾配の大きい領域に小さな重みづけをしたウェイトマップを生成するウェイトマップ生成部106と、前記生体画像に前記ウェイトマップによる重みづけを付与して、輝度分布推定画像を生成する輝度分布推定部108と、前記生体画像と前記輝度分布推定画像の画像データの比較に基づいて、前記生体画像を補正した輝度補正画像を出力する輝度補正部110と、を備える。【選択図】図5
