METHOD AND APPARATUS FOR NON-CONTACT ESTIMATION OF PULSE TRANSMIT TIME
First Claim
1. A method for estimating a pulse transmit time (PTT) to calculate a blood pressure, comprising:
- receiving, by a processor, a series of video images over a period of time that includes a first location of an individual and a second location of the individual;
calculating, by the processor, a first set of luminance values of the first location and a second set of luminance values of the second location;
estimating, by the processor, the PTT based on an average time difference from consecutive peaks of the first set of luminance values and the second set of luminance values; and
transmitting, by the processor, the PTT to a blood pressure calculation device to calculate the blood pressure based on the PTT that is estimated.
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Abstract
A method, non-transitory computer readable medium and apparatus for estimating a pulse transmit time (PTT) to calculate a blood pressure are disclosed. For example, the method includes receiving a series of video images over a period of time that includes a first location of an individual and a second location of the individual, calculating a first set of luminance values of the first location and a second set of luminance values of the second location, estimating the PTT based on an average time difference from consecutive peaks of the first set of luminance values and the second set of luminance values and transmitting the PTT to a blood pressure calculation device to calculate the blood pressure based on the PTT that is estimated.
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Citations
20 Claims
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1. A method for estimating a pulse transmit time (PTT) to calculate a blood pressure, comprising:
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receiving, by a processor, a series of video images over a period of time that includes a first location of an individual and a second location of the individual; calculating, by the processor, a first set of luminance values of the first location and a second set of luminance values of the second location; estimating, by the processor, the PTT based on an average time difference from consecutive peaks of the first set of luminance values and the second set of luminance values; and transmitting, by the processor, the PTT to a blood pressure calculation device to calculate the blood pressure based on the PTT that is estimated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A non-transitory computer-readable medium storing a plurality of instructions, which when executed by a processor, cause the processor to perform operations for estimating a pulse transmit time (PTT) to calculate a blood pressure, the operations comprising:
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receiving a series of video images over a period of time that includes a first location of an individual and a second location of the individual; calculating a first set of luminance values of the first location and a second set of luminance values of the second location; estimating the PTT based on an average time difference from consecutive peaks of the first set of luminance values and the second set of luminance values; and transmitting the PTT to a blood pressure calculation device to calculate the blood pressure based on the PTT that is estimated. - View Dependent Claims (16, 17, 18, 19)
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20. A method for estimating a pulse transmit time (PTT) to calculate a blood pressure, the method comprising:
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receiving, by a processor, a first video over a period of time of a forehead of an individual and a second video of a palm of the individual; identifying, by the processor, a forehead region of interest (ROI) comprising a first plurality of macro pixels in the first video of the forehead and a palm ROI comprising a second plurality of macro pixels in the second video of the palm; determining, by the processor, forehead luminance values for each one of the first plurality of macro pixels over the time period and palm luminance values for each one of the second plurality of macro pixels over the period of time; identifying, by the processor, peaks in the forehead luminance values and the palm luminance values; pairing, by the processor, a macro pixel of the first plurality of macro pixels with a macro pixel of the second plurality of macro pixels to create a plurality of macro pixel pairs; aligning, by the processor, the forehead luminance values with the palm luminance values of each one of the plurality of macro pixel pairs; calculating, by the processor, for each one of the plurality of macro pixel pairs an average time difference between consecutive peaks, wherein the consecutive peaks comprise a peak of the forehead luminance values and an adjacent peak of the palm luminance values; estimating, by the processor, the PTT based on an overall average of the average time difference calculated for each one of the plurality of macro pixel pairs; and transmitting, by the processor, the PTT to a blood pressure calculation device to calculate the blood pressure based on the PTT that is estimated.
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Specification