Calorie estimation apparatus and method, and wearable device
A calorie estimation apparatus and method that analyze a user's skin spectrum to determine calories of food and drink that the user has ingested are provided. The calorie estimation apparatus includes a spectrum measurer configured to measure a skin spectrum of a user; and a processor configured to determine a noise of the measured skin spectrum, and estimate calories consumed by the user based on the determined noise.
1. A calorie estimation apparatus comprising:
a spectrum measurer configured to measure a skin spectrum of a user by radiating light to skin of the user and detecting spectral lines of the light that is reflected or scattered by the skin; and
a processor configured to:
determine a noise of the measured skin spectrum;
determine a difference between the determined noise and a reference spectrum noise; and
estimate calories consumed by the user based on the determined difference between the determined noise and the reference spectrum noise by using a correlation model correlating a predefined noise and calories.
2. The calorie estimation apparatus of claim 1 , wherein the reference spectrum noise comprises at least one of statistics regarding a noise of a spectrum on an empty stomach of the user and noises of spectrums on empty stomachs of a plurality of users.
3. The calorie estimation apparatus of claim 1 , wherein the processor is configured to determine statistics regarding a spectrum variation in one or more positions of the measured spectrum, and use the determined statistics as the noise of the measured skin spectrum.
4. The calorie estimation apparatus of claim 3 , wherein the statistics regarding the spectrum variation comprises at least one of root mean square and standard deviation.
5. The calorie estimation apparatus of claim 1 , wherein the light comprises at least one of near-infrared light and mid-infrared light.
6. A calorie estimation method comprising:
measuring a skin spectrum of a user by radiating light to skin of the user and detecting spectral lines of the light that returns from the skin;
determining a noise of the measured skin spectrum;
determining a difference between the determined noise and a reference spectrum noise; and
estimating calories consumed by the user based on the determined difference between the determined noise and the reference spectrum noise by using a correlation model correlating a predefined noise and calories.
7. The calorie estimation method of claim 6 , wherein the reference spectrum noise comprises at least one of statistics regarding a noise of a spectrum on an empty stomach of the user and noises of spectrums on empty stomachs of a plurality of users.
8. The calorie estimation method of claim 6 , wherein the determining the noise comprises:
determining statistics regarding a spectrum variation in one or more positions of the measured spectrum; and
using the determined statistics as the noise of the measured skin spectrum.