Pulse wave measuring apparatus, control method, and non-transitory computer-readable recording medium

A pulse wave measuring apparatus, comprising:

• a light emitter that illuminates with light having an amount an area containing a part of skin of a user staying in a vehicle;
• an imager that captures an image of the area;
• a controller that
• (D) obtains a present time and a present position of the vehicle, and estimates an incident amount of sun light that enters the vehicle at the present position at the present time, and
• (E) calculates the amount under a condition that a sum of the estimated incident amount and the amount is a constant value;
• and
• a pulse wave calculator that calculates a pulse wave of the user using the image, and outputs pulse wave information of the user.

A control method, comprising:

• obtaining a driving route from a departure point of a vehicle to a destination point of the vehicle;
• obtaining an estimated time at which the vehicle passes through a location along the driving route;
• predicting an incident amount of sun light entering the vehicle at the location at the estimated time;
• calculating an amount of light emitted from a light emitter under a condition that a sum of the incident amount and the amount is a constant value;
• causing the light emitter at the location to emit light at the amount to illuminate an area containing skin of a user staying in the vehicle;
• obtaining an image containing an image of the skin;
• calculating a pulse wave of the user using the image;
• and
• outputting information related to the pulse wave.

A control method, comprising:

• obtaining a present time and a present position of a vehicle;
• estimating an incident amount of sun light entering the vehicle at the present position at the present time;
• calculating an amount of light emitted from a light emitter under a condition that a sum of the incident amount and the amount is a constant value;
• causing the light emitter to emit light at the amount to illuminate an area containing skin of a user staying in the vehicle;
• obtaining an image containing an image of the skin;
• calculating a pulse wave of the user using the image;
• and
• outputting information related to the pulse wave.

A non-transitory computer-readable recording medium being non-volatile and storing a control program causing an apparatus including a processor to perform a process, the process comprising:

• obtaining a driving route from a departure point of a vehicle to a destination point of the vehicle;
• obtaining an estimated time at which the vehicle passes through a location along the driving route;
• predicting an incident amount of sun light entering the vehicle at the location at the estimated time;
• calculating an amount of light emitted from a light emitter under a condition that a sum of the incident amount and the amount is a constant value;
• causing the light emitter at the location to emit light at the amount to illuminate an area containing skin of a user staying in the vehicle;
• obtaining an image containing an image of the skin;
• calculating a pulse wave of the user using the image;
• and
• outputting information related to the pulse wave.

A non-transitory computer-readable recording medium being non-volatile and storing a control program causing an apparatus including a processor to perform a process, the process comprising:

• obtaining a present time and a present position of a vehicle;
• estimating an incident amount of sun light entering the vehicle at the present position at the present time;
• calculating an amount of light emitted from a light emitter under a condition that a sum of the incident amount and the amount is a constant value;
• causing the light emitter to emit light at the amount to illuminate an area containing skin of a user staying in the vehicle;
• obtaining an image containing an image of the skin;
• calculating a pulse wave of the user using the image;
• and
• outputting information related to the pulse wave.