Chart, manufacturing method, determination system, determination method, and recording medium
AssigneeNEC Corporation
InventorsChisato Funayama, Masato Tsukada
Life of this patent
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Abstract
A chart includes: a substrate; a first skin reflection patch part that is formed on the substrate and that simulates reflection of near-infrared rays of a predetermined wavelength, in a skin of a living body of a first skin color; and a second skin reflection patch part that is formed on the substrate and that simulates reflection of the near-infrared rays of the predetermined wavelength, in the skin of the living body of a second skin color that is different from the first skin color. According to such a chart, it is possible to properly determine whether or not an imaging environment of an image is suitable for biometric authentication.
Claims12
A determination system comprising:
- an imaging unit comprising a camera;
- a light source that applies near-infrared rays of a predetermined wavelength to an imaging target of the imaging unit;
- at least one memory that is configured to store instructions;
- and
- at least one processor that is configured to execute the instructions to:
- determine whether or not a light environment in imaging by the imaging unit is suitable for biometric authentication, on the basis of an image that is captured by applying the near-infrared rays of the predetermined wavelength to a chart, which includes:
- a substrate;
- a first skin reflection patch coating that is formed on the substrate and that simulates reflection of near-infrared rays of a predetermined wavelength, in a skin of a living body of a first skin color;
- and a second skin reflection patch coating that is formed on the substrate and that simulates reflection of the near-infrared rays of the predetermined wavelength, in the skin of the living body of a second skin color that is different from the first skin color.
A determination method that is executed by a computer, the determination method including:
- capturing an image by applying near-infrared rays of a predetermined wavelength to a chart, which includes:
- a substrate;
- a first skin reflection patch coating that is formed on the substrate and that simulates reflection of near-infrared rays of a predetermined wavelength, in a skin of a living body of a first skin color;
- and a second skin reflection patch coating that is formed on the substrate and that simulates reflection of the near-infrared rays of the predetermined wavelength, in the skin of the living body of a second skin color that is different from the first skin color;
- and
- determining whether or not a light environment in capturing the image is suitable for biometric authentication, on the basis of the image.
Dependencies are inferred from the claim text.