PULSE WAVE DETECTION METHOD, PULSE WAVE DETECTION APPARATUS, AND RECORDING MEDIUM
First Claim
1. A pulse wave detection method comprising:
- obtaining an image obtained by photographing a subject with an imaging device;
extracting intensities representative of signal components of a specific frequency band for respective wavelength components among signals of a plurality of wavelength components included in the image, the specific frequency band having a section having a predetermined length or less overlapping a frequency band that pulse waves are enabled to take;
calculating, using the intensities extracted for the respective wavelength components, a weight coefficient by which a signal is multiplied when the signals are calculated between the wavelength components to minimize an arithmetic value of the signal components in the specific frequency band after multiplication;
multiplying at least one of the signals of the respective wavelength components by the weight coefficient;
performing arithmetic operation on the signals between the wavelength components after multiplication by the weight coefficient; and
detecting pulse waves of the subject using a signal after the arithmetic operation.
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Abstract
A pulse wave detection method includes obtaining an image obtained by photographing a subject with an imaging device, extracting intensities representative of signal components of a specific frequency band for respective wavelength components among signals of a plurality of wavelength components included in the image, calculating, using the intensities extracted for the respective wavelength components, a weight coefficient by which a signal is multiplied when the signals are calculated between the wavelength components to minimize an arithmetic value of the signal components in the specific frequency band after multiplication, multiplying at least one of the signals of the respective wavelength components by the weight coefficient, performing arithmetic operation on the signals between the wavelength components after multiplication by the weight coefficient, and detecting pulse waves of the subject using a signal after the arithmetic operation.
17 Citations
10 Claims
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1. A pulse wave detection method comprising:
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obtaining an image obtained by photographing a subject with an imaging device; extracting intensities representative of signal components of a specific frequency band for respective wavelength components among signals of a plurality of wavelength components included in the image, the specific frequency band having a section having a predetermined length or less overlapping a frequency band that pulse waves are enabled to take; calculating, using the intensities extracted for the respective wavelength components, a weight coefficient by which a signal is multiplied when the signals are calculated between the wavelength components to minimize an arithmetic value of the signal components in the specific frequency band after multiplication; multiplying at least one of the signals of the respective wavelength components by the weight coefficient; performing arithmetic operation on the signals between the wavelength components after multiplication by the weight coefficient; and detecting pulse waves of the subject using a signal after the arithmetic operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A pulse wave detection apparatus comprising:
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an obtaining unit that obtains an image obtained by photographing a subject with an imaging device; an extracting unit that extracts intensities representative of signal components of a specific frequency band for respective wavelength components among signals of a plurality of wavelength components included in the image, the specific frequency band having a section having a predetermined length or less overlapping a frequency band that pulse waves are enabled to take; a calculator that calculates, using the intensities extracted for the respective wavelength components, a weight coefficient by which a signal is multiplied when the signals are calculated between the wavelength components to minimize an arithmetic value of the signal components in the specific frequency band after multiplication; a multiplier that multiplies at least one of the signals of the respective wavelength components by the weight coefficient; an arithmetic unit that performs arithmetic operation on the signals between the wavelength components after multiplication by the weight coefficient; and a detector that detects pulse waves of the subject using a signal after the arithmetic operation.
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10. A non-transitory computer readable recording medium having stored therein a pulse wave detection program that causes a computer to execute a process comprising:
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obtaining an image obtained by photographing a subject with an imaging device; extracting intensities representative of signal components of a specific frequency band for respective wavelength components among signals of a plurality of wavelength components included in the image, the specific frequency band having a section having a predetermined length or less overlapping a frequency band that pulse waves are enabled to take; calculating, using the intensities extracted for the respective wavelength components, a weight coefficient by which a signal is multiplied when the signals are calculated between the wavelength components to minimize an arithmetic value of the signal components in the specific frequency band after multiplication; multiplying at least one of the signals of the respective wavelength components by the weight coefficient; performing arithmetic operation on the signals between the wavelength components after multiplication by the weight coefficient; and detecting pulse waves of the subject using a signal after the arithmetic operation.
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Specification