Biological information acquisition device

1 . A biological information acquisition device that acquires biological information of a living body in a non-contact manner, the biological information acquisition device comprising:

a near-infrared light source configured to emit near-infrared light, having an intensity peak in a near-infrared wavelength band of 760 nm or more and 1100 nm or less, toward the living body;

a solid-state image sensor comprising at least one specific pixel having a sensitivity peak in a specific wavelength band of 620 nm or more and 1100 nm or less, the solid-state image sensor configured to capture one or more images of the living body by receiving light arriving from the living body; and

an information processing device configured to:

repeatedly acquire (i) an emission image frame captured by the solid-state image sensor during an emission period of the near-infrared light source, and (ii) a non-emission image frame captured by the solid-state image sensor during a non-emission period of the near-infrared light source,

derive the biological information based on the emission image frame and the non-emission image frame, wherein:

an arbitrary one of a plurality of emission image frames, including the emission image frame, is defined as a first emission frame of interest, and

a next emission image frame following the first emission frame of interest is defined as a second emission frame of interest,

obtain a signal value of a virtual emission image frame in the non-emission period between a time, at which the first emission frame of interest is captured, and a time, at which the second emission frame of interest is captured, through interpolation based on a signal value of the first emission frame of interest and a signal value of the second emission frame of interest, and

further derive the biological information based on the signal value of the virtual emission image frame.

2 . A biological information acquisition device that acquires biological information of a living body in a non-contact manner, the biological information acquisition device comprising:

a near-infrared light source configured to emit near-infrared light, having an intensity peak in a near-infrared wavelength band of 760 nm or more and 1100 nm or less, toward the living body;

a solid-state image sensor comprising at least one specific pixel having a sensitivity peak in a specific wavelength band of 620 nm or more and 1100 nm or less, the solid-state image sensor configured to capture one or more images of the living body by receiving light arriving from the living body; and

an information processing device configured to:

repeatedly acquire (i) an emission image frame captured by the solid-state image sensor during an emission period of the near-infrared light source, and (ii) a non-emission image frame captured by the solid-state image sensor during a non-emission period of the near-infrared light source,

derive the biological information based on the emission image frame and the non-emission image frame, wherein:

an arbitrary one of a plurality of non-emission image frames, including the non-emission image frame, is defined as a first non-emission frame of interest, and

a next non-emission image frame following the first non-emission frame of interest is defined as a second non-emission frame of interest,

obtain a signal value of a virtual non-emission image frame in the emission period between a time, at which the first non-emission frame of interest is captured, and a time, at which the second non-emission frame of interest is captured, through interpolation based on a signal value of the first non-emission frame of interest and a signal value of the second non-emission frame of interest, and

further derive the biological information based on the signal value of the virtual non-emission image frame.

3 . A biological information acquisition device that acquires biological information of a living body in a non-contact manner, the biological information acquisition device comprising:

a near-infrared light source configured to emit near-infrared light, having an intensity peak in a near-infrared wavelength band of 760 nm or more and 1100 nm or less, toward the living body;

a solid-state image sensor comprising at least one specific pixel having a sensitivity peak in a specific wavelength band of 620 nm or more and 1100 nm or less, the solid-state image sensor configured to capture one or more images of the living body by receiving light arriving from the living body; and

an information processing device configured to:

repeatedly acquire (i) an emission image frame captured by the solid-state image sensor during an emission period of the near-infrared light source, and (ii) a non-emission image frame captured by the solid-state image sensor during a non-emission period of the near-infrared light source,

derive the biological information based on the emission image frame and the non-emission image frame, wherein:

the at least one specific pixel comprises (i) a near-infrared pixel having a sensitivity peak in the near-infrared wavelength band, and (ii) a first pixel having a sensitivity peak in a first wavelength band of 620 nm or more and 740 nm or less, and

an image of the one or more images comprises (i) a near-infrared image component corresponding to the near-infrared pixel and (ii) a first image component corresponding to the first pixel,

correct the near-infrared image component based on the first image component, and

further derive the biological information based on the near-infrared image component after the correction.

4 . The biological information acquisition device according to claim 3 ,

wherein:

the solid-state image sensor further comprises at least one second pixel having a sensitivity peak in a second wavelength band of 350 nm or more and 590 nm or less,

the image further comprises a second image component corresponding to the second pixel, and

the information processing device is further configured to:

further correct the near-infrared image component on the basis of the second image component, and

derive the biological information further based on the near-infrared image component after the correction.

5 . The biological information acquisition device according to claim 4 ,

wherein the information processing device is further configured to derive near-infrared light-based biological information corresponding to the near-infrared image component based on the near-infrared image component.

6 . The biological information acquisition device according to claim 4 ,

wherein the information processing device is further configured to derive non-near-infrared light-based biological information corresponding to the first image component and the second image component based on the first image component and the second image component.

7 . The biological information acquisition device according to claim 4 ,

wherein one of the at least one specific pixel is adjacent to one of the at least one second pixel.

8 . The biological information acquisition device according to claim 4 ,

wherein:

the solid-state image sensor comprises a near-infrared pixel region, a first pixel region, and a second pixel region that are spaced apart from each other,

the near-infrared pixel region comprises a plurality of near-infrared pixels, including the near-infrared pixel, that are adjacent to each other,

the first pixel region comprises a plurality of first pixels, including the first pixel, that are adjacent to each other, and

the second pixel region comprises a plurality of second pixels, including the at least one second pixel, that are adjacent to each other.

9 . The biological information acquisition device according to claim 1 ,

wherein the information processing device is further configured to derive a pulse volume as the biological information.