Abstract: A determination method includes acquiring a plurality of images which are captured at different times by a camera; and determining, when each of the plurality of images includes a first image region of a face of a person and a second image region which is located outside the first image region and has a shape which satisfies a predetermined condition, whether the face of the person is a display object based on a state of change in a positional relationship between the first image region and the second image region between the plurality of images.

Abstract: In a determination method, a computer executes processing including: generating face image data from which noise is removed by a specific algorithm from face image data when the face image data is acquired; generating difference image data concerning difference between the face image data that has been acquired and the face image data that has been generated; determining whether or not the face image data that has been acquired is a composite image based on information included in the difference image data; and determining whether or not the face image data that has been acquired is a composite image based on information included in frequency data generated from the difference image data in a case where the face image data that has been acquired is not determined to be a composite image.

Abstract: A determination method for a computer to execute a process includes acquiring a facial image; obtaining, for each of color components included in the facial image, an index that indicates a degree of possibility that a wearing object that partially shields a face is present in the facial image based on distribution of brightness of each of the color components in the facial image; determining first color component of the color components included in the facial image based on color information of the facial image; and determining whether the wearing object is present in the facial image based on the determined first color component and the index for each of the color components.

Abstract: A face authentication method for a computer to execute a process includes acquiring a plurality of images from a camera; acquiring a contour change degree that represents a difference between a first contour included in an image imaged in a first image and a second contour included in the face image imaged in a second image, the plurality of images including the first image and the second image; acquiring a reflection change degree that represents a difference between first light reflection characteristic of the first image and second light reflection characteristic of the second image; and determining whether imaging targets of the camera has switched, based on the contour change degree and the reflection change degree.

Abstract: An identification method executed by a computer, the identification method includes receiving a face image; generating each of a plurality of first estimated values regarding an attribute of a face image by using a plurality of estimation models that generates a first estimated value regarding the attribute of the face image from the face image; generating a plurality of pieces of similarity information that indicates a similarity between feature information of the face image and a plurality of pieces of feature information respectively associated with the plurality of estimation models; and generating a second estimated value regarding the attribute of the face image, based on the plurality of first estimated values and the plurality of pieces of similarity information.

Abstract: An image processing apparatus includes memory that stores a plurality of images acquired by image-capturing a face of a person; and a processor, coupled to the memory, configured to: acquire a pixel value pattern indicating a relationship between positions in a given direction and pixel values in an area having parts of the face of each of the plurality of images, and select an image to be processed from the plurality of images based on the pixel value patterns of the plurality of images.

Abstract: An image processing device includes one or more memories; and one or more processors coupled to the one or more memories and the one or more processors configured to store, in the one or more memories, a plurality of time-series images that has captured an object when the object is instructed to change an orientation of a face, extract a face region from each of the plurality of time-series images, obtain characteristic of changes of pixel values of a plurality of pixels arranged in a certain direction in the face region, specify an action of the object based on a time-series change in the characteristic of changes obtained from each of the plurality of time-series images, and determine authenticity of the object based on the action of the object.

Abstract: A biometric authentication device includes: a first memory; and a processor configured to: acquire an image that includes a face of one or more persons; specify a region that a face of a head person of a waiting line in which the one or more persons line up appears from the acquired image; extract feature of the face of the head person included in the specified region; select, by a first collation process of collating the extracted feature with feature indicating facial characteristics of persons and biometric information of each person, a group of persons similar to the head person among the persons; acquire the biometric information of the head person; and authenticate the head person by a second collation process of collating the biometric information of each person included in the group among the biometric information with the acquired biometric information of the head person.

Abstract: An information processing apparatus, includes: a memory; and a processor coupled to the memory, wherein the processor: generates a sharpened image of a fingerprint image by emphasizing edges of a fingerprint pattern included in the fingerprint image; calculates an edge density of the sharpened image based on a local change of luminance; and decides based on the edge density whether each of pixels of the sharpened image is in a fingerprint region or a background region.

Abstract: An image processing apparatus includes memory that stores a plurality of images acquired by image-capturing a face of a person; and a processor, coupled to the memory, configured to: acquire a pixel value pattern indicating a relationship between positions in a given direction and pixel values in an area having parts of the face of each of the plurality of images, and select an image to be processed from the plurality of images based on the pixel value patterns of the plurality of images.

Abstract: An information processing apparatus includes a memory configured to store first information of a first fingerprint image, and a processor coupled to the memory and configured to obtain second information of a second fingerprint image, generate third information of a third fingerprint image by enlarging or reducing the second fingerprint image, specify an enlargement rate or a reduction rate based on a first similarity between the second information and the first information and a second similarity between the third information and the first information, and execute a first matching process of the first information and fourth information of a fourth fingerprint image, the fourth fingerprint image being generated by enlarging or reducing the first fingerprint image by the enlargement rate or the reduction rate.

Abstract: An image processing device includes: a memory; and a processor coupled to the memory and the processor configured to execute a process, the process comprising: acquiring a plurality of biometric images of a same biological body part of a same user from a biometric sensor; generating, when a feature point appears at a corresponding position of the same biological body part in one or more of the plurality of biometric images and a feature point does not appear at the corresponding position in another of the plurality of biometric images, a pseudo feature point at the corresponding position of the another; and storing information of the feature point and the pseudo feature point of the plurality of biometric images as a biometric feature.

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: An information processing apparatus, includes: a memory; and a processor coupled to the memory, wherein the processor: generates a sharpened image of a fingerprint image by emphasizing edges of a fingerprint pattern included in the fingerprint image; calculates an edge density of the sharpened image based on a local change of luminance; and decides based on the edge density whether each of pixels of the sharpened image is in a fingerprint region or a background region.

Abstract: An information processing apparatus includes a memory and a processor configured to store registered feature information of a first biometric image which is acquired from a registrant, divide a second biometric image which is acquired from an authentication subject into areas, calculate a clarity level indicating a clarity of an image of each of the areas, set, among the areas, at least part of a first area that is an area with the clarity level less than a first threshold, as a mask area, in accordance with the clarity level of each of the areas, generate a corrected biometric image by correcting an image of a second area other than the mask area among the areas; extract feature information from the corrected biometric image, and compare the registered feature information and the extracted feature information to perform authentication for the authentication subject.

Abstract: An information processing apparatus includes a memory configured to store first information of a first fingerprint image, and a processor coupled to the memory and configured to obtain second information of a second fingerprint image, generate third information of a third fingerprint image by enlarging or reducing the second fingerprint image, specify an enlargement rate or a reduction rate based on a first similarity between the second information and the first information and a second similarity between the third information and the first information, and execute a first matching process of the first information and fourth information of a fourth fingerprint image, the fourth fingerprint image being generated by enlarging or reducing the first fingerprint image by the enlargement rate or the reduction rate.

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: An image processing device includes: a memory; and a processor coupled to the memory and the processor configured to execute a process, the process comprising: acquiring a plurality of biometric images of a same biological body part of a same user from a biometric sensor; generating, when a feature point appears at a corresponding position of the same biological body part in one or more of the plurality of biometric images and a feature point does not appear at the corresponding position in another of the plurality of biometric images, a pseudo feature point at the corresponding position of the another; and storing information of the feature point and the pseudo feature point of the plurality of biometric images as a biometric feature.

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.