Method and apparatus for correction of non-invasive blood glucose measurement
First Claim
1. A method for correction of non-invasive blood glucose measurement, comprising:
- irradiating light on the region of the skin to be measured;
obtaining a pixel video image of the region of the skin including a subcutaneous blood vessel in real time from the light reflected from the skin by using an image sensor of a camera, the camera including a first wavelength filter for selection of blood glucose information, wherein the first wavelength filter filters the scope of wavelength that comprises a blood glucose information spectrum, and including a second wavelength filter for selection of pulse information, wherein the second wavelength filter filters the scope of wavelength that corresponds to a pulse information spectrum, and wherein obtaining the pixel video image in real time comprises;
obtaining a first pixel video image in real time by passing the reflected light through the first filter; and
obtaining a second pixel video image in real time by passing the reflected light through the second filter;
identifying pixels corresponding to the subcutaneous blood vessel from the pixel video images obtained in real time, and selecting a first pixel that corresponds to a specific location on the skin from the identified pixels, and obtaining a first signal that indicates the changes in the pixel information over time in the first pixel of the first pixel video image, and obtaining a second signal that indicates the changes in the pixel information over time in the first pixel of the second pixel video image, the obtained first signal including the blood glucose information and the pulse information of a specific region of the subcutaneous blood vessel, and the obtained second signal including the pulse information of the specific region of the subcutaneous blood vessel;
obtaining a blood glucose signal, wherein a pulse signal has been corrected, in real time, by removing the second signal from the first signal; and
calculating blood flow rate by using a thickness of the blood vessel and blood flow velocity, and calculating the amount of blood glucose from the calculated blood flow rate and the blood glucose signal.
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Abstract
Correction of a non-invasive blood glucose measurement measured from a video image. Correction includes irradiating white light on the skin, filtering the white light reflected from the skin by a first wavelength filter and a second wavelength filter, obtaining a first signal including a blood glucose signal and a pulse signal based on a video image generated by the white light filtered by the first wavelength filter, obtaining a second signal including a pulse signal based on a video image generated by the white light filtered by the second wavelength filter, obtaining a blood glucose signal by subtracting the second signal from the first signal, and calculating the amount of blood glucose in a subcutaneous blood vessel based on the obtained blood glucose signal. Moreover, fundamental blood glucose signals can be extracted in real time without collecting blood.
18 Citations
12 Claims
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1. A method for correction of non-invasive blood glucose measurement, comprising:
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irradiating light on the region of the skin to be measured; obtaining a pixel video image of the region of the skin including a subcutaneous blood vessel in real time from the light reflected from the skin by using an image sensor of a camera, the camera including a first wavelength filter for selection of blood glucose information, wherein the first wavelength filter filters the scope of wavelength that comprises a blood glucose information spectrum, and including a second wavelength filter for selection of pulse information, wherein the second wavelength filter filters the scope of wavelength that corresponds to a pulse information spectrum, and wherein obtaining the pixel video image in real time comprises; obtaining a first pixel video image in real time by passing the reflected light through the first filter; and obtaining a second pixel video image in real time by passing the reflected light through the second filter; identifying pixels corresponding to the subcutaneous blood vessel from the pixel video images obtained in real time, and selecting a first pixel that corresponds to a specific location on the skin from the identified pixels, and obtaining a first signal that indicates the changes in the pixel information over time in the first pixel of the first pixel video image, and obtaining a second signal that indicates the changes in the pixel information over time in the first pixel of the second pixel video image, the obtained first signal including the blood glucose information and the pulse information of a specific region of the subcutaneous blood vessel, and the obtained second signal including the pulse information of the specific region of the subcutaneous blood vessel; obtaining a blood glucose signal, wherein a pulse signal has been corrected, in real time, by removing the second signal from the first signal; and calculating blood flow rate by using a thickness of the blood vessel and blood flow velocity, and calculating the amount of blood glucose from the calculated blood flow rate and the blood glucose signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for correction of non-invasive blood glucose measurement, comprising:
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a light source that irradiates light on the region of the skin to be measured; and a camera including an image sensor for obtaining a pixel video image of the region of the skin including a subcutaneous blood vessel in real time from the light reflected from the skin, the camera including a first wavelength filter for selection of blood glucose information, wherein the first wavelength filter filters the scope of wavelength that comprises a blood glucose information spectrum, and including a second wavelength filter for selection of pulse information, wherein the second wavelength filter filters the scope of wavelength that corresponds to a pulse information spectrum, and the pixel video image including a first pixel video image obtained in real time by passing the reflected light through the first filter and a second pixel video image obtained in real time by passing the reflected light through the second filter; and a server including a signal processor configured to; identify pixels corresponding to the subcutaneous blood vessel from the pixel video images obtained in real time, select a first pixel that corresponds to a specific location on the skin from the identified pixels, obtain a first signal that indicates the changes in the pixel information over time in the first pixel of the first pixel video image, and obtain a second signal that indicates the changes in the pixel information over time in the first pixel of the second pixel video image, the obtained first signal including the blood glucose information and the pulse information of a specific region of the subcutaneous blood vessel and the obtained second signal including the pulse information of the specific region of the subcutaneous blood vessel; obtain a blood glucose signal, wherein a pulse signal has been corrected, in real time, by removing the second signal from the first signal; and calculate blood flow rate by using the thickness of the blood vessel and blood flow velocity, and calculate the amount of blood glucose from the calculated blood flow rate and the blood glucose signal. - View Dependent Claims (10, 11, 12)
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Specification