Bio-information estimating apparatus and bio-information estimating method
A bio-information estimating apparatus includes a sensor part configured to measure a pulse wave signal from an object, a contact force that is applied by the object to the sensor part, and a contact area of the object that is applied to the sensor part, and a processor configured to obtain a first feature value, based on a first change in the contact area with respect to a second change in the contact force, obtain a second feature value, based on the pulse wave signal, and estimate bio-information, based on the first feature value and the second feature value.
1 . A bio-information estimating apparatus comprising:
a main body;
a display mounted on a first surface of the main body;
a sensor part mounted on a second surface of the main body that is opposite to the first surface of the main body and configured to come into contact with a skin of a user, the sensor part comprising a pressure sensor and an area sensor, the pressure sensor configured to, based on an object contacting the pressure sensor, measure a contact force that is applied by the object to the pressure sensor, and the area sensor configured to measure a contact area of the object that is applied to the sensor part, the sensor part further comprising a pulse wave sensor that includes a light source that emits light onto the skin of the user and a complementary metal oxide semiconductor (CMOS) image sensor that detects the light emitted by the light source and scattered or reflected from the skin of the user;
a physical hardware button provided on the main body; and
a processor mounted on the first surface or second surface of the main body and electrically connected to the display and the sensor part, the processor configured to:
create, upon activation of the physical hardware button and using a signal from the pressure sensor and a signal form the area sensor, a contact area change graph representing a first change in the contact area with respect to a second change in the contact force, by plotting the contact area with respect to the contact force at each of measurement time points, and
obtain a first feature value, using the contact area change graph, based on the first change in the contact area with respect to the second change in the contact force,
estimate first bio-information, based on the first feature value, and
output the estimated first bio-information to the display,
wherein the bio-information estimating apparatus is a wearable device.
2 . The bio-information estimating apparatus of claim 1 , wherein the first feature value comprises any one or any combination of a maximum slope, a minimum slope, and an average slope of each of predetermined unit sections of the contact area change graph.
3 . The bio-information estimating apparatus of claim 1 , wherein the first bio-information comprises either one or both of skin elasticity and skin age.
4 . The bio-information estimating apparatus of claim 3 , wherein as a change trend of the first feature value increases in comparison to a reference feature value that is obtained from the user at a reference time, the skin elasticity decreases, and the skin age increases, and
wherein as the change trend of the first feature value decreases compared to the reference feature value, the skin elasticity increases, and the skin age decreases.
5 . The bio-information estimating apparatus of claim 3 , wherein the processor is further configured to estimate either one or both of the skin elasticity and the skin age by applying a pre-defined bio-information estimation model to a change trend of the first feature value in comparison with a plurality of feature values that is obtained from a plurality of subjects.
6 . The bio-information estimating apparatus of claim 1 , wherein the sensor part is further configured to measure a pulse wave signal, and
wherein the processor is further configured to obtain a second feature value, based on the pulse wave signal, and estimate second bio-information, based on the first feature value and the second feature value.
7 . The bio-information estimating apparatus of claim 6 , wherein the second bio-information comprises a blood pressure, and
the processor is further configured to obtain an oscillometry of the pulse wave signal, and obtain the second feature value, based on the oscillometry.
8 . The bio-information estimating apparatus of claim 6 , further comprising an output interface configured to output an estimation result of the first bio-information and the second bio-information.
9 . The bio-information estimating apparatus of claim 6 , further comprising a communication interface configured to transmit an estimation result of the first bio-information and the second bio-information, to an external device.