Abstract: A device to extract a biometric feature vector includes a memory and a circuitry. The circuitry is configured to obtain a biometric image, to generate a plurality of small region images from the biometric image so that variability of biometric information amounts among the plurality of small region images is equal to or less than a predetermined value, to extract biometric local feature amounts from the small region images and to generate a biometric feature vector by combining the biometric local feature amounts in accordance with a predetermined rule, the biometric feature vector indicating a feature for identifying the biometric image.

Abstract: An image processing device includes: a biometric sensor; and a processor to execute a process comprising: detecting base points of a first and a second fingers; calculating a first standard point between one of the base points of the first finger and one of the base points of the second finger; calculating a second standard point on a bisector of an angle formed by a straight line passing through one of the base points of the first finger on an opposite side of the second finger and the first standard point and a straight line passing through one of the base points of the second finger on an opposite side of the first finger, and the first standard point; and applying an affine conversion to the palm image so that coordinates of the first and second standard points are converted into predetermined coordinates.

Abstract: A biological image processing device includes: a memory; and a processor coupled to the memory and the processor configured to execute a process, the process comprising: extracting at least one line from contours of a palm and principal lines of the palm shown in an image of the palm; extracting pixels of the line extracted by the extracting of at least one line; setting a local region for each of the pixels, each local region including each corresponding one of the pixels; calculating, for each local region, local orientations of the line extracted by the extracting of at least one line, in accordance with gradient intensities related to respective orientations of each corresponding local region; and calculating an orientation of the palm in accordance with a statistical amount of the respective local orientations.

Abstract: A biometric information correcting apparatus includes: a palm print feature point extracting unit that extracts two feature points of a palm print of a user's hand from a first image obtained by capturing the palm print and representing the palm print; and a correcting unit that rotates a vein pattern of the user's hand on a second image or a feature portion of the vein pattern extracted from the second image, according to an orientation of a line joining the two feature points, the second image being obtained by a biometric information acquiring unit capturing the vein pattern, the second image being obtained by a biometric information acquiring unit capturing the vein pattern.

Abstract: A device to extract a biometric feature vector includes: a memory; and a circuitry, wherein the circuitry is configured: to obtain a biometric image; to generate a plurality of small region images from the biometric image so that variability of biometric information amounts among the plurality of small region images is equal to or less than a predetermined value; to extract biometric local feature amounts from the small region images; and to generate a biometric feature vector by combining the biometric local feature amounts in accordance with a predetermined rule, the biometric feature vector indicating a feature for identifying the biometric image.