Spoofing detection apparatus, spoofing detection method, and computer-readable recording medium

A spoofing detection method comprising:

• obtaining, from an image capture apparatus, a first image frame that includes a face of a subject person when light was emitted from a light-emitting apparatus associated with the image capture apparatus and a second image frame that includes the face of the subject person when the light-emitting apparatus was turned off;
• extracting information specifying a face portion of the subject person as first face information, from the first image frame, and extracting information specifying a face portion of the subject person as second face information, from the second image frame;
• obtaining a luminance value of the face portion in the first image frame using the first face information, obtaining a luminance value of the face portion in the second image frame using the second face information, and calculating, based on the obtained luminance values, a feature value that reflects a three-dimensional shape of the face of the subject person, and that is independent of colors of a surface of the face of the subject person;
• determining authenticity of the subject person captured by the image capture apparatus, based on the feature value;
• extracting a portion that includes a bright point formed by reflection in an iris region of an eye of the subject person, from the first image frame based on the first face information, further extracts a portion corresponding to the portion that includes the bright point, from the second image frame based on the second face information, and calculates, based on the two extracted portions, a second feature value;
• and
• determining authenticity of the subject person captured by the image capture apparatus, based on the second feature value and the feature value that reflects the three-dimensional shape of the face of the subject person, and that is independent of the colors of the surface of the face of the subject person.

A non-transitory computer-readable recording medium that includes a program recorded thereon, the program including instructions that cause a computer to carry out:

• obtaining, from an image capture apparatus, a first image frame that includes a face of a subject person when light was emitted from a light-emitting apparatus associated with the image capture apparatus and a second image frame that includes the face of the subject person when the light-emitting apparatus was turned off;
• extracting information specifying a face portion of the subject person as first face information, from the first image frame, and extracting information specifying a face portion of the subject person as second face information, from the second image frame;
• obtaining a luminance value of the face portion in the first image frame using the first face information, obtaining a luminance value of the face portion in the second image frame using the second face information, and calculating, based on the obtained luminance values, a feature value that reflects a three-dimensional shape of the face of the subject person, and that is independent of colors of a surface of the face of the subject person;
• determining authenticity of the subject person captured by the image capture apparatus, based on the feature value;
• extracting a portion that includes a bright point formed by reflection in an iris region of an eye of the subject person, from the first image frame based on the first face information, further extracts a portion corresponding to the portion that includes the bright point, from the second image frame based on the second face information, and calculates, based on the two extracted portions, a second feature value;
• and
• determining authenticity of the subject person captured by the image capture apparatus, based on the second feature value and the feature value that reflects the three-dimensional shape of the face of the subject person, and that is independent of the colors of the surface of the face of the subject person.