Biometric apparatus, biometric method, and non-transitory computer-readable storage medium

A biometric method comprising:

• causing a light source to repeatedly emit a light pulse radiated onto a target part including a head of a target;
• causing an image sensor to receive a reflected light pulse which is caused as the light pulse is radiated onto the target part;
• causing the image sensor to output first image data indicating appearance of a face of the target;
• causing the image sensor to output second image data according to distribution of an amount of light of at least one of components of the reflected light pulse;
• and
• generating data indicating a state of the target based on a temporal change in the first image data and a temporal change in the second image data and outputting the data.

A non-transitory computer-readable storage medium storing a program for measuring a state of a target, the program, when executed by a computer, causing the computer to perform a process comprising:

• causing a light source to repeatedly emit a light pulse radiated onto a target part including a head of the target;
• causing an image sensor to receive a reflected light pulse which is caused as the light pulse is radiated onto the target part;
• causing the image sensor to output first image data indicating appearance of a face of the target;
• causing the image sensor to output second image data according to distribution of an amount of light of at least one of components of the reflected light pulse;
• and
• generating data indicating the state of the target based on a temporal change in the first image data and a temporal change in the second image data and outputting the data.