Measurement apparatus and measurement method

A measurement apparatus, comprising:

• a projector configured to project pulse light or light whose intensity is periodically modulated onto a subject;
• an imaging sensor that includes a plurality of pixels, the imaging sensor being configured to image backscattered light of the light projected by the projector from the subject a plurality of times to output a plurality of image signals;
• a selection circuit configured to select, for each of the pixels, an image signal closest to a reference light amount from the plurality of image signals;
• and
• a characteristic calculation circuit configured to calculate, for each of the pixels, TOF information obtained when the image signal selected by the selection circuit is imaged and calculate a characteristic of the subject based on the TOF information, wherein
• the projector is configured to project the light while changing a light amount, and
• the imaging sensor is configured to perform imaging a plurality of times in each of which the light amount of the light projected from the projector is different.

A measurement method executed by a measurement apparatus that includes an imaging sensor including a plurality of pixels and measures a characteristic of a subject, the method comprising:

• projecting pulse light or light whose intensity is periodically modulated onto the subject;
• imaging backscattered light of the projected light from the subject a plurality of times to output a plurality of image signals;
• selecting, for each of the pixels, an image signal closest to a reference light amount from the plurality of image signals;
• calculating, for each of the pixels, TOF information obtained when the selected image signal is imaged;
• acquiring light intensity information of the projected light;
• and
• calculating a characteristic of the subject based on the calculated TOF information and the acquired light intensity information.

A measurement method executed by a measurement apparatus that includes an imaging sensor including a plurality of pixels and measures a characteristic of a subject, the method comprising:

• projecting pulse light or light whose intensity is periodically modulated onto the subject while changing a light amount;
• imaging backscattered light of the projected light from the subject a plurality of times in each of which the light amount of the light projected from the projector is different to output a plurality of image signals;
• selecting, for each of the pixels, an image signal closest to a reference light amount from the plurality of image signals;
• calculating, for each of the pixels, TOF information obtained when the selected image signal is imaged;
• and
• calculating a characteristic of the subject based on the TOF information.