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

1. A spoofing detection apparatus comprising:

memory storing a program; and

a processor configured to run the program to execute:

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 extract information specifying a face portion of the subject person as second face information, from the second image frame;

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, also extract a portion corresponding to the portion that includes the bright point, from the second image frame, based on the second face information, and calculate, based on the two extracted portions, a feature that is independent of a position of the bright point; and

determining authenticity of the subject person captured by the image capture apparatus, based on the feature.

2. The spoofing detection apparatus according to claim 1 , the processor configured to run the program to further execute:

setting a light-emitting period of the light-emitting apparatus and a shooting timing of the image capture apparatus.

3. The spoofing detection apparatus according to claim 1 ,

wherein the processor configured to run the program to further execute:

calculating a second feature that reflects a three-dimensional shape of the face of the subject person, in addition to the feature that is independent of the position of the bright point, and

determining authenticity of the subject person captured by the image capture apparatus, based on the feature that is independent of the position of the bright point and the second feature.

4. The spoofing detection apparatus according to claim 3 ,

wherein the processor configured to run the program to further execute:

separately executing authenticity determination that is based on the feature that is independent of the position of the bright point and authenticity determination that is based on the second feature, calculates a score that indicates a possibility of being authentic every time authenticity determination is performed, and executes conclusive authenticity determination based on scores calculated in the respective instances of authenticity determination.

5. A spoofing detection performed by a spoofing detection apparatus, the 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;

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, also extracting a portion corresponding to the portion that includes the bright point, from the second image frame, based on the second face information, and calculating, based on the two extracted portions, a feature that is independent of a position of the bright point; and

determining authenticity of the subject person captured by the image capture apparatus, based on the feature.

6. 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;

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, also extracting a portion corresponding to the portion that includes the bright point, from the second image frame, based on the second face information, and calculating, based on the two extracted portions, a feature that is independent of a position of the bright point; and

determining authenticity of the subject person captured by the image capture apparatus, based on the feature.

7. The spoofing detection method according to claim 5 , further comprising:

setting a light-emitting period of the light-emitting apparatus and a shooting timing of the image capture apparatus.

8. The spoofing detection method according to claim 5 ,

wherein, when the portion is extracted, a second feature that reflects a three-dimensional shape of the face of the subject person is calculated, in addition to the feature that is independent of the position of the bright point, and

when the authenticity of the subject person is determined, authenticity of the subject person captured by the image capture apparatus is determined based on the feature that is independent of the position of the bright point and the second feature.

9. The spoofing detection method according to claim 8 ,

wherein, when the authenticity of the subject person is determined, authenticity determination that is based on the feature that is independent of the position of the bright point and authenticity determination that is based on the second feature are separately executed, a score that indicates a possibility of being authentic is calculated every time authenticity determination is performed, and conclusive authenticity determination is executed based on scores calculated in the respective instances of authenticity determination.

10. The non-transitory computer-readable recording medium according to claim 6 , the program further including an instruction that causes a computer to carry out:

setting a light-emitting period of the light-emitting apparatus and a shooting timing of the image capture apparatus.

11. The non-transitory computer-readable recording medium according to claim 6 ,

wherein, when the portion is extracted, a second feature that reflects a three-dimensional shape of the face of the subject person is calculated, in addition to the feature that is independent of the position of the bright point, and

when the authenticity of the subject person is determined, authenticity of the subject person captured by the image capture apparatus is determined based on the feature that is independent of the position of the bright point and the second feature.

12. The non-transitory computer-readable recording medium according to claim 11 ,

wherein, when the authenticity of the subject person is determined, authenticity determination that is based on the feature that is independent of the position of the bright point and authenticity determination that is based on the second feature are separately executed, a score that indicates a possibility of being authentic is calculated every time authenticity determination is performed, and conclusive authenticity determination is executed based on scores calculated in the respective instances of authenticity determination.