Chart, manufacturing method, determination system, determination method, and recording medium

1 . 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.

2 . The determination system according to claim 1 , wherein the at least one processor is configured to execute the instructions to determine whether or not the light environment in the imaging by the imaging unit is suitable for biometric authentication, on the basis of one or a plurality of images that are captured by disposing the chart at different distances from the imaging unit.

3 . The determination system according to claim 1 , wherein the at least one processor is configured to execute the instructions to adjust the light environment in the imaging by the imaging unit, on the basis of a determination result.

4 . The determination device according to claim 1 , wherein the at least one processor is configured to execute the instructions to output notice that encourages adjustment of the light environment in the imaging by the imaging unit, in a case where at least one of the imaging unit and the light source is replaced.

5 . The determination system according to claim 1 , wherein the at least one processor is configured to execute the instructions to adjust the light environment in the imaging by the imaging unit, on the basis of a difference between a first image obtained by imaging the chart before replacement and a second image obtained by imaging the chart after replacement, in a case where at least one of the imaging unit and the light source is replaced.

6 . The determination system according to claim 1 , wherein the at least one processor is configured to execute the instructions to:

calculate an adjustment value for adjusting the light environment in the imaging by the imaging unit, on the basis of a plurality of images of the chart that are captured in a situation in which at least one of a season, a time zone, and weather is different; and

adjust the light environment in the imaging by the imaging unit, by reflecting the adjustment value corresponding to at least one of a current season, a current time zone, and current weather.

7 . 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.

8 . The determination method according to claim 7 , further comprising determining whether or not the light environment in the imaging by the imaging unit is suitable for biometric authentication, on the basis of one or a plurality of images that are captured by disposing the chart at different distances from the imaging unit.

9 . The determination method according to claim 7 , further comprising adjusting the light environment in the imaging by the imaging unit, on the basis of a determination result.

10 . The determination method according to claim 7 , further comprising outputting notice that encourages adjustment of the light environment in the imaging by the imaging unit, in a case where at least one of the imaging unit and the light source is replaced.

11 . The determination method according to claim 7 , further comprising adjusting the light environment in the imaging by the imaging unit, on the basis of a difference between a first image obtained by imaging the chart before replacement and a second image obtained by imaging the chart after replacement, in a case where at least one of the imaging unit and the light source is replaced.

12 . The determination method according to claim 7 , further comprising:

calculating an adjustment value for adjusting the light environment in the imaging by the imaging unit, on the basis of a plurality of images of the chart that are captured in a situation in which at least one of a season, a time zone, and weather is different; and

adjusting the light environment in the imaging by the imaging unit, by reflecting the adjustment value corresponding to at least one of a current season, a current time zone, and current weather.