US-20260129310-A1 - LIVING BODY INFORMATION ACQUISITION APPARATUS AND NON-TRANSITORY COMPUTER-READABLE STORAGE MEDIUM STORING LIVING BODY INFORMATION ACQUISITION PROGRAM

US20260129310A1US 20260129310 A1US20260129310 A1US 20260129310A1US-20260129310-A1

Abstract

A living body information acquisition apparatus includes: an imaging portion configured to capture reflected light reflected off a living body and containing first wavelength light having a first wavelength and second wavelength light having a second wavelength different from the first wavelength, and output a first output value relating to the first wavelength light and a second output value relating to the second wavelength light; a data processing portion configured to perform data correction on the first output value to cause the first output value to approach a median derived from an output resolution of the imaging portion; and a calculation portion configured to calculate living body information based on the first output value and the second output value.

Inventors

Akira Ikeda
Satoshi Shimizu

Assignees

SEIKO EPSON CORPORATION

Dates

Publication Date: 20260507
Application Date: 20250901
Priority Date: 20240904

Claims (11)

1 . A living body information acquisition apparatus comprising: an imaging portion configured to capture reflected light reflected off a living body and containing first wavelength light having a first wavelength and second wavelength light having a second wavelength different from the first wavelength, and output a first output value relating to the first wavelength light and a second output value relating to the second wavelength light; a data processing portion configured to perform data correction on the first output value to cause the first output value to approach a median derived from an output resolution of the imaging portion; and a calculation portion configured to calculate living body information based on the first output value and the second output value.
2 . The living body information acquisition apparatus according to claim 1 , wherein when the first output value is greater than a predetermined threshold, the data processing portion is configured to decrease the first output value.
3 . The living body information acquisition apparatus according to claim 1 , wherein when a ratio of the first output value to the second output value is greater than a predetermined ratio value, the data processing portion is configured to decrease the first output value.
4 . The living body information acquisition apparatus according to claim 1 , wherein the data processing portion is configured to perform the data correction on the second output value.
5 . The living body information acquisition apparatus according to claim 4 , wherein the data processing portion is configured to adjust the first output value and the second output value to the median derived from the output resolution as the data correction.
6 . The living body information acquisition apparatus according to claim 4 , wherein the data processing portion is configured to perform the data correction on the first output value and the second output value by adjusting a signal amplification factor.
7 . The living body information acquisition apparatus according to claim 4 , further comprising a storage portion configured to store a first correction value used to correct the first output value and a second correction value used to correct the second output value, wherein the data processing portion is configured to perform the data correction on the first output value and the second output value by using the first correction value and the second correction value.
8 . The living body information acquisition apparatus according to claim 4 , wherein the imaging portion is configured to capture the reflected light to generate captured data, and the data processing portion is configured to calculate a first adjustment quantity used to adjust the first output value and a second adjustment quantity used to adjust the second output value based on the captured data, and perform the data correction on the first output value and the second output value by using the first adjustment quantity and the second adjustment quantity.
9 . The living body information acquisition apparatus according to claim 4 , wherein the imaging portion is configured to output a third output value relating to third wavelength light having a third wavelength different from the first wavelength and the second wavelength, and the data processing portion is configured to perform the data correction on the third output value.
10 . A living body information acquisition apparatus comprising: a color filter configured to transmit reflected light reflected off a living body and containing first wavelength light having a first wavelength and second wavelength light having a second wavelength different from the first wavelength; an imaging portion configured to capture the reflected light passing through the color filter and output a first output value relating to the first wavelength light and a second output value relating to the second wavelength light; and a calculation portion configured to calculate living body information based on the first output value and the second output value, wherein the color filter has light transmittance that causes the first output value to approach a median derived from an output resolution of the imaging portion.
11 . A non-transitory computer-readable storage medium storing a living body information acquisition program configured to cause a computer coupled to an imaging unit including an imaging portion configured to capture reflected light reflected off a living body and containing first wavelength light having a first wavelength and second wavelength light having a second wavelength different from the first wavelength and output a first output value relating to the first wavelength light and a second output value relating to the second wavelength light to calculate living body information based on the first output value and the second output value on which data correction that causes the first output value and the second output value to approach a median derived from an output resolution of the imaging portion is performed.

Description

The present application is based on, and claims priority from JP Application Serial Number 2024-152088, filed Sep. 4, 2024, the disclosure of which is hereby incorporated by reference herein in its entirety. BACKGROUND 1. Technical Field The present disclosure relates to a living body information acquisition apparatus and a non-transitory computer-readable storage medium storing a living body information acquisition program. 2. Related Art There is a known pulse wave measurement apparatus that acquires living body information such as a pulse wave. The pulse wave measurement apparatus is an example of the living body information acquisition apparatus. A pulse wave measurement apparatus described in JP-A-2021-183079 includes an imaging device, a display device, and an input device. The imaging device has three channels: a channel R (red); a channel G (green); and a channel B (blue). The pulse wave measurement apparatus measures a pulse wave signal from a living body by using video images of a face region of the living body captured by the imaging device. JP-A-2021-183079 is an example of the related art. Signals output from the three channels R, G, and B and carrying video images of the face region of a living body captured by the imaging device differ from each other. Since the signals output from the three channels R, G, and B differ from each other, the accuracy of detection of the pulse wave signal decreases in some cases. SUMMARY A living body information acquisition apparatus according to an aspect of the present disclosure includes: an imaging portion configured to capture reflected light reflected off a living body and containing first wavelength light having a first wavelength and second wavelength light having a second wavelength different from the first wavelength, and output a first output value relating to the first wavelength light and a second output value relating to the second wavelength light; a data processing portion configured to perform data correction on the first output value to cause the first output value to approach a median derived from an output resolution of the imaging portion; and a calculation portion configured to calculate living body information based on the first output value and the second output value. A living body information acquisition apparatus according to another aspect of the present disclosure includes: a color filter configured to transmit reflected light reflected off a living body and containing first wavelength light having a first wavelength and second wavelength light having a second wavelength different from the first wavelength; an imaging portion configured to capture the reflected light passing through the color filter and output a first output value relating to the first wavelength light and a second output value relating to the second wavelength light; and a calculation portion configured to calculate living body information based on the first output value and the second output value, and the color filter has light transmittance that causes the first output value to approach a median derived from an output resolution of the imaging portion. A non-transitory computer-readable storage medium storing a living body information acquisition program according to another aspect of the present disclosure is configured to cause a computer coupled to an imaging unit including an imaging portion configured to capture reflected light reflected off a living body and containing first wavelength light having a first wavelength and second wavelength light having a second wavelength different from the first wavelength and output a first output value relating to the first wavelength light and a second output value relating to the second wavelength light to calculate living body information based on the first output value and the second output value on which data correction that causes the first output value and the second output value to approach a median derived from an output resolution of the imaging portion is performed. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a schematic configuration of a measurement apparatus. FIG. 2 shows a schematic configuration of an imaging unit. FIG. 3 is a block diagram showing the configuration of the measurement apparatus. FIG. 4 shows an example of signal values. FIG. 5 shows an example of the signal values. FIG. 6 shows an example of grayscale values. FIG. 7 shows an example of the grayscale values. FIG. 8 shows an example of the signal values. FIG. 9 shows an example of the signal values. FIG. 10 shows an example of the signal values. FIG. 11 shows an example of a detection region. FIG. 12 shows an example of detected grayscale values. FIG. 13 shows an example of an analysis procedure for detecting a pulse wave signal. FIG. 14 shows a result of analysis of a noise-removed signal. FIG. 15 shows an example of a control procedure executed by the measuring apparatus. DESCRIPTION OF EMBODIMENTS FIG. 1 shows a schematic configuratio