Patent Description:
Reactive oxygen species are an important part of the biological defense mechanisms, such as white blood cells that protect the body against infections. However, it has been known that excessive production of reactive oxygen species in the body may lead to various diseases in tissues.

Common factors that cause the reactive oxygen species include stress, alcohol, peroxides, medicine, and the like. The reactive oxygen species produced by these factors may cause cranial nerve diseases, circulatory diseases, cancer, digestive tract diseases, liver diseases, arteriosclerosis, renal diseases, diabetes, aging, and the like.

Human bodies have a series of antioxidant defense systems to protect against oxygen toxicity. In order for such systems to normally operate, sufficient amounts of antioxidants are needed such as vitamin E, vitamin C, carotenoid, flavonoid, and the like. Thus, there is a need for an apparatus and a method for easily identifying the amount of antioxidants in the body. <CIT> discloses an integrated device for non-invasive analyte measurement. An integrated device for non-invasive analyte measurement is described. The device uses attenuated total reflection, ATR, infrared spectroscopy for glucose measurement from the user's skin surface. The device also includes a pressure and/or user identification sensor(s) to ensure that an authorized user is utilizing the device. The identification sensor may utilize capacitive or infrared detection of biometric identification features, such as fingerprints, for comparison to a stored value indicative of an authorized user. The device may be configured such that verification of a user's identity may be a prerequisite to use and/or activation of the device. <CIT> refers to optical detection of carotenoid-related compounds in human bone and surrounding tissues. This technique is directed to measuring the levels of carotenoids and other similar chemical compounds that are present in varying degrees in human bone and surrounding tissues. Light reflected from an exposed bone or surrounding tissue is captured and processed to accurately quantify the carotenoid content of the bone or tissue. <CIT> discloses a device and method for determining a concentration in a sample. A device for optical detection of analytes in a sample includes at least two optoelectronic components. The optoelectronic components include at least one optical detector configured to receive a photon and at least one optical emitter configured to emit a photon. The at least one optical emitter includes at least three optical emitters disposed in a flat, non-linear arrangement, and the at least one optical detector includes at least three optical detectors disposed in a flat, non-linear arrangement. The at least three optical emitters and the at least three optical detectors include at least three different wavelength characteristics. <CIT> refers to a touch screen touch force measurement based on finger deformation speed. A device includes a capacitive sampling unit that measures, at multiple instances of time during a touch interval, capacitance values of a capacitive touch screen display associated with an area in contact with a finger touching the capacitive touch screen display. The device further includes a touch deformation area unit that determines, at the multiple instances of time, a size of the area upon the capacitive touch screen display in contact with the finger touching the capacitive touch screen display. The device also includes a touch force estimation unit that determines a rate of change in the size of the area in contact with the finger, and estimates a touching force of the finger touching the capacitive touch screen display based on the determined rate of change in the size of the area. It is the object of the present invention to provide an improved antioxidant sensor and method for measuring an antioxidant signal.

According to an example not claimed, there is provided an antioxidant sensor, including: a touch sensor configured to detect a contact with an object; a first light source configured to emit light of a first wavelength onto the object; a light receiver configured to receive light returning from the object; and a processor configured to extract an image of a contact surface of the object based on a sensor value of the touch sensor, configured to analyze the extracted image of the contact surface, and configured to obtain an antioxidant signal of the object by driving the first light source based on a result of analyzing the image of the contact surface.

The antioxidant signal may include a signal associated with carotenoid.

The first wavelength may include a blue wavelength.

The processor may be further configured to determine a contact pressure reflection index by analyzing the extracted image of the contact surface, and based on the contact pressure reflection index being lower than or equal to a predetermined threshold, the processor may be further configured to obtain the antioxidant signal of the object by driving the first light source.

The contact pressure reflection index may include at least one of a change in an area of the contact surface, a change in a length of the contact surface, or a number of wrinkles in the image of the contact surface.

Based on the determined contact pressure reflection index being in a state of being lower than or equal to a predetermined threshold and the state being maintained for a predetermined period of time, the processor may be further configured to obtain the antioxidant signal of the object by driving the first light source.

Based on the determined contact pressure reflection index exceeding the predetermined threshold, the processor may be further configured to generate information for guiding a contact pressure between the object and the touch sensor to be increased, and output the information.

The light receiver may include at least one of a photodetector or a spectrometer.

The antioxidant sensor may include a second light source configured to emit light of a second wavelength onto the object touching the touch sensor, wherein the processor may be further configured to, based on the determined contact pressure reflection index being lower than or equal to a predetermined threshold, obtain a preprocessing signal of the object by driving the second light source and preprocess the obtained antioxidant signal based on the obtained preprocessing signal.

The second wavelength may include at least one of a blue wavelength, a green wavelength, or a red wavelength.

The processor may be further configured to normalize the antioxidant signal by subtracting the preprocessing signal from the antioxidant signal or by dividing the antioxidant signal by the preprocessing signal.

The processor may be further configured to determine an antioxidant level of the object by analyzing the obtained antioxidant signal.

The processor may be further configured to determine the antioxidant level of the object by using an antioxidant level estimation model which defines a relationship between the antioxidant signal and the antioxidant level.

The processor may be further configured to, based on the determined antioxidant level being lower than or equal to a predetermined threshold level, generate information recommending an increase of the antioxidant level and output the information.

According to the present invention, there is provided a method of obtaining an antioxidant signal, including: detecting a contact with an object using a touch sensor; extracting, by a processor, an image of a contact surface of the object based on a sensor value of the touch sensor; and analyzing, by the processor, the extracted image of the contact surface, and obtaining, by the processor, an antioxidant signal of the object by driving a light source to emit light of a first wavelength onto the object based on a result of the analysing and by controlling a light receiver to receive light returning from the object, wherein obtaining the antioxidant signal comprises determining, by the processor, a contact pressure reflection index by analyzing the extracted image of the contact surface; and based on the contact pressure reflection index being lower than or equal to a predetermined threshold, obtaining, by the processor, the antioxidant signal of the object, and wherein the contact pressure reflection index comprises a change in a length of the contact surface, wherein the change in the length of the contact surface is calculated by subtracting a preceding value from a current value, or by dividing the current value by the preceding value.

The contact pressure reflection index may include at least one of a change in an area of the contact surface, or a number of wrinkles in the image of the contact surface.

The obtaining the antioxidant signal may include, based on the determined contact pressure reflection index being in a state of being lower than or equal to a predetermined threshold and the state being maintained for a predetermined period of time, obtaining the antioxidant signal of the object.

Based on the determined contact pressure reflection index exceeding the predetermined threshold, generating information for guiding a contact pressure between the object and the touch sensor to be increased, and outputting the information.

The obtaining the antioxidant signal may include: obtaining a preprocessing signal of the object by emitting light of a second wavelength onto the object; and preprocessing the obtained antioxidant signal based on the obtained preprocessing signal.

The preprocessing of the obtained antioxidant signal may include normalizing the antioxidant signal by subtracting the preprocessing signal from the antioxidant signal or by dividing the antioxidant signal by the preprocessing signal.

The method may include determining an antioxidant level of the object by analyzing the obtained antioxidant signal.

The determining the antioxidant level may include determining the antioxidant level of the object by using an antioxidant level estimation model which defines a relationship between the antioxidant signal and the antioxidant level.

The method may include, based on the determined antioxidant level being lower than or equal to a predetermined threshold level, generating information recommending an increase of the antioxidant level and outputting the information.

According to the present invention, there is provided an antioxidant sensor including: a light source configured to emit light onto an object; an optical fingerprint sensor configured to generate an image of a contact surface of the object that touches the optical fingerprint sensor based on light returning from the object; and a processor configured to obtain a skin spectrum of the object based on the light returning from the object, configured to analyze the image of the contact surface, and configured to determine an antioxidant level of the object by analyzing the skin spectrum based on a result of analyzing the image of the contact surface, wherein the processor is further configured to determine a contact pressure reflection index by analyzing the image of the contact surface, and based on contact pressure reflection index being lower than or equal to a predetermined threshold, the processor is further configured to determine the antioxidant level of the object by analyzing the skin spectrum, and wherein the contact pressure reflection index comprises a change in a length of the contact surface, wherein the change in length of the contact surface is calculated by subtracting a preceding value from a current value, or by dividing the current value by the preceding value.

The light source may be further configured to emit visible light, including a blue wavelength, onto the object.

The light source may be provided in a display panel.

The optical fingerprint sensor may be provided in a complementary metal oxide semiconductor image sensor.

Based on the determined contact pressure reflection index being in a state of being lower than or equal to a predetermined threshold and the state being maintained for a predetermined period of time, the processor may be further configured to determine the antioxidant level of the object by analyzing the skin spectrum.

Based on the determined contact pressure reflection index exceeding the predetermined threshold, the processor may be further configured to generate information for guiding a contact pressure between the object and the optical fingerprint sensor to be increased, and output the information.

The processor may be further configured to extract an absorbance of a first wavelength from the skin spectrum, and determines the antioxidant level of the object based on the extracted absorbance of the first wavelength.

The processor may be further configured to extract an absorbance of a second wavelength from the skin spectrum, and normalizes the absorbance of the first wavelength based on the extracted absorbance of the second wavelength.

The first wavelength may include a blue wavelength; and the second wavelength may include a blue wavelength, a green wavelength, or a red wavelength.

The processor may be further configured to normalize the absorbance of the first wavelength by subtracting the absorbance of the second wavelength from the absorbance of the first wavelength or by dividing the absorbance of the first wavelength by the absorbance of the second wavelength.

Based on the antioxidant level being lower than or equal to a predetermined threshold level, the processor may be further configured to generate information recommending an increase of the antioxidant level and output the information.

According to the present invention, there is further provided a computer-readable medium having instructions that, when performed by a processor of an antioxidant sensor, including: a touch sensor configured to detect a touch with an object; a spectrum measurer configured to measure a skin spectrum from the object; and a processor configured to: extract an image of a contact surface of the object based on a sensor value of the optical fingerprint sensor, configured to determine a contact pressure reflection index by analyzing the extracted image of the contact surface, and based on the contact pressure reflection index being lower than or equal to a predetermined threshold, configured to obtain the skin spectrum by driving the spectrum measurer, and configured to determine an antioxidant level of the object by analyzing the obtained skin spectrum, and determine a contact pressure reflection index by analyzing the image of the contact surface, and based on contact pressure reflection index being lower than or equal to a predetermined threshold, determine the antioxidant level of the object by analyzing the skin spectrum, wherein the contact pressure reflection index comprises a change in a length of the contact surface, wherein the change in length of the contact surface is calculated by subtracting a preceding value from a current value, or by dividing the current value by the preceding value.

The spectrum measurer may include: a plurality of light sources configured to emit light of different wavelengths onto the object; a photodetector configured to receive light returning from the object; and a spectrum reconstructor configured to reconstruct the skin spectrum based on the received light.

The spectrum measurer may include: a light source configured to emit light of a predetermined wavelength onto the object; and a spectrometer configured to generate the skin spectrum by separating the light returning from the object.

According to the present invention, there is further provided an antioxidant sensor, including: a fingerprint sensor configured to detect a contact with an object, and configured to generate an image of a contact surface of the object; a light source configured to emit light of a predetermined wavelength onto the object; a light receiver configured to receive light returning from the object; and a processor configured to analyze the generated image of the contact surface, and configured to obtain an antioxidant signal of the object by driving the light source and controlling the light receiver based on a result of analyzing the image of the contact surface, wherein the processor is further configured to determine a contact pressure reflection index by analyzing the generated image of the contact surface, and based on the determined contact pressure reflection index being ina state of being lower than or equal to a predetermined threshold and the state being maintained for a predetermined period of time, the processor is further configured to obtain the antioxidant signal of the object by driving the light source and controlling the light receiver, and wherein the contact pressure reflection index comprises a change in a length of the contact surface, wherein the change in the length of the contact surface is calculated by subtracting a preceding value from a current value, or by dividing the current value by the preceding value.

Based on the determined contact pressure reflection index exceeding the predetermined threshold, the processor may be further configured to generate information for guiding a contact pressure between the object and the fingerprint sensor to be increased, and output the information.

The processor may be further configured to detect a fingerprint by analyzing the generated image of the contact surface, and identify a user based on the detected fingerprint.

The above and/or other aspects of the disclosure will become apparent and more readily appreciated from the following description of the example embodiments, taken in conjunction with the accompanying drawings, in which:.

Hereinafter, example embodiments of the disclosure will be described in detail with reference to the accompanying drawings. It should be noted that, in the drawings, the same reference symbols refer to same parts although illustrated in other drawings. In the following description, a detailed description of known functions and configurations will be omitted when it may obscure the subject matter of the disclosure.

Process steps described herein may be performed differently from a specified order, unless a specified order is clearly stated as being necessary in the context of the disclosure. That is, each step may be performed in a specified order, at substantially the same time, in a reverse order, or in any other order different from the specified order.

Further, the terms used throughout this specification are defined in consideration of the functions according to example embodiments, and can be varied according to a purpose and an application of the functions and the like. Therefore, definitions of the terms should be understood based on the overall context.

It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms, These terms are only used to distinguish one element from another. Any references to a singular element may include plural elements unless expressly stated otherwise. In the specification, it should be understood that the terms, such as 'including' or 'having,' etc., are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof disclosed in the specification, and are not intended to preclude the possibility that one or more other features, numbers, steps, actions, components, parts, or combinations thereof may exist or may be added,.

Further, components that will be described in the specification are discriminated merely according to functions mainly performed by the components. That is, two or more components which will be described later can be integrated into a single component. Furthermore, a single component which will be explained later can be separated into two or more components. Moreover, each component which will be described can additionally perform some or all of a function executed by another component in addition to the main function thereof. Some or all of the main function of each component which will be explained can be carried out by another component. Each component may be implemented as hardware, software, or a combination of both.

<FIG> is an example diagram illustrating a change in an optical density spectrum of skin according to a contact pressure applied to the skin, and <FIG> is an example diagram illustrating a change in an antioxidant signal in skin according to a contact pressure applied to the skin. In <FIG>, the term "pressure steps" refers to a magnitude of a pressure applied to the skin, and the higher the pressure step is, the higher the magnitude of a pressure applied to the skin is.

Referring to <FIG>, an optical density spectrum of skin is changed according to a pressure applied to the skin. For example, it can be seen from the example of <FIG> that in a wavelength band of about <NUM> to about <NUM>, a peak height increases as a contact pressure applied to skin increases. Here, the wavelength band of about <NUM> to about <NUM> may be included in a wavelength band in which an antioxidant signal is obtained, e.g., an absorption band of an antioxidant substance (e.g., carotenoid). Further, the peak height may indicate optical density, from which interference caused by a substance other than an antioxidant substance is eliminated by a preprocessing process (e.g., baseline correction, normalization, etc.).

Referring to <FIG>, it can be seen that as a contact pressure applied to skin increases, a peak height of an antioxidant signal increases, and at a pressure greater than or equal to a predetermined level applied to the skin, an antioxidant signal is saturated, e.g., converges to a predetermined value and stabilized. Further, it can be seen that a coefficient of variation (CV) of the peak height of an antioxidant signal decreases as a contact pressure applied to skin increases.

<FIG> is an example diagram illustrating a relationship between a contact pressure applied to skin and a contact area; <FIG> and <FIG> are example diagrams illustrating a relationship between a contact pressure applied to skin and a length of a contact surface; and <FIG> is an example diagram illustrating a relationship between a contact pressure applied to skin and a number of wrinkles extracted from an image of a contact surface. In <FIG>, the term "pressure steps" refers to a magnitude of a pressure applied to the skin, and the higher the pressure step is, the higher the magnitude of a pressure applied to the skin is.

Referring to <FIG>, a contact area, a length of a contact surface, and a number of wrinkles extracted from an image of the contact surface may vary according to a contact pressure applied to skin. In the example of <FIG>, as a contact pressure applied to skin increases, a contact area increases; and at a pressure greater than or equal to a predetermined level applied to the skin, the contact area may converge to a predetermined value. In the examples of <FIG> and <FIG>, as a contact pressure applied to skin increases, a length (y) in a long axis (or longitudinal axis) direction and a length (x) in a short axis (or a width axis) direction of a contact surface increase; and at a pressure greater than or equal to a predetermined level applied to the skin, the length (y) in the long axis direction and the length (x) in the short axis of the contact surface may converge to a predetermined value. In the example of <FIG>, as a contact pressure applied to skin increases, the number of wrinkles extracted from the image of the contact surface is reduced; and at a pressure greater than or equal to a predetermined level applied to the skin, the number of wrinkles extracted from the image of the contact surface may become zero.

Accordingly, a pressure applied to skin may be estimated by analyzing at least one of the contact area, the length (e.g., the long-axis direction length (y) and the short-axis direction length (x)) of the contact surface, and the number of wrinkles extracted from the image of the contact surface; and an antioxidant signal may be obtained by guiding a user to apply a pressure, which is greater than or equal to a threshold pressure, to the object based on the estimated pressure, such that an antioxidant signal having a high signal-to-noise ratio may be obtained without using a pressure sensor.

<FIG> is a diagram illustrating an example of an antioxidant sensor <NUM> according to an example embodiment. The antioxidant sensor <NUM> of <FIG> is an apparatus for non-invasively measuring an antioxidant level of an object, and may be embedded in an electronic device, or may be enclosed in a housing to be provided as a separate device. Examples of the electronic device may include a cellular phone, a smartphone, a tablet PC, a laptop computer, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation, an MP3 player, a digital camera, a wearable device, and the like; and examples of the wearable device may include a wristwatch-type wearable device, a wristband-type wearable device, a ring-type wearable device, a waist belt-type wearable device, a necklace-type wearable device, an ankle band-type wearable device, a thigh band-type wearable device, a forearm band-type wearable device, and the like. However, the electronic device is not limited to the above examples, and the wearable device is neither limited thereto.

Referring to <FIG>, the antioxidant sensor <NUM> includes a touch sensor <NUM>, a light source part <NUM>, a light receiver <NUM>, and a processor <NUM>. Here, the processor <NUM> may include one or more processors, a memory, and/or a combination thereof.

The touch sensor <NUM> may detect a contact with an object. The touch sensor <NUM> may be of one or more various types such as a capacitive type, a resistive type, an infrared type, an acoustic wave type, a pressure type, and the like.

The light source part <NUM> includes a light source <NUM> which emits light of a predetermined wavelength onto an object according to a predetermined control signal. The light source <NUM> may emit light of, for example, a blue wavelength, which is included in a wavelength band, e.g., an absorption band of an antioxidant substance (e.g., carotenoid), onto the object. In an example embodiment, the light source <NUM> may include a light emitting diode (LED), an organic light emitting diode (OLED), a Quantum dot light-emitting diode (QLED), a laser diode, a fluorescent body, and the like.

In addition, the light source part <NUM> may further include at least one optical element (e.g., mirror, etc.) for directing the light emitted by the light source <NUM> toward a desired position of the object.

The light receiver <NUM> may receive light reflected or scattered from the object. In an example embodiment, the light receiver <NUM> may be provided in a photodetector or a spectrometer. Here, the photodetector may receive light reflected or scattered from an object, and may convert the received light into an electric signal, and may include a photo diode, a photo transistor (PTr), a charge-coupled device image sensor (CCD image sensor), a complementary metal oxide semiconductor image sensor (CIS), and the like. Further, the spectrometer may receive light reflected or scattered from an object and may separate the received light. The spectrometer may include an interference spectrometer, a grating spectrometer, a prism spectrometer, and the like.

Further, the light receiver <NUM> may further include at least one optical element (e.g., mirror, etc.) for directing light reflected or scattered from an object toward the light receiver <NUM>.

The processor <NUM> may control the overall operation of the antioxidant sensor <NUM>.

Once an object touches the touch sensor <NUM>, the processor <NUM> may extract an image of a contact surface of the object based on a sensor value of the touch sensor <NUM>. For example, the processor <NUM> may extract the image of the contact surface by performing contouring based on the sensor value of the touch sensor <NUM>.

The processor <NUM> may analyze the extracted image of the contact surface, and may obtain an antioxidant signal by controlling the light source <NUM> based on the analysis of the extracted image of the contact surface. In this case, the antioxidant signal may be a signal associated with carotenoid accumulated in the epidermis. For example, the processor <NUM> may determine a contact pressure reflection index; and if the contact pressure reflection index is lower than or equal to a predetermined threshold, the processor <NUM> may drive the light source <NUM> to obtain an antioxidant signal of the object. Alternatively, if the contact pressure reflection index is lower than or equal to a predetermined threshold value, and such a state is maintained for a predetermined period of time, the processor <NUM> may drive the light source <NUM> to obtain an antioxidant signal of the object. Here, the contact pressure reflection index may include at least one of a change in the area of the contact surface, a change in the length of the contact surface, and the number of wrinkles in the extracted image of the contact surface.

In an example embodiment, the processor <NUM> may determine a change in the area of the contact surface by analyzing the image of the contact surface. The change in the area of the contact surface may be calculated by subtracting a preceding value from a current value or by dividing the current value by the preceding value. However, this is merely an example and the disclosure is not limited thereto. Further, if the change in the area of the contact surface is less than or equal to a first threshold, or if the change in the area of the contact surface is less than or equal to the first threshold and such a state is maintained for a predetermined period of time, the processor <NUM> may determine that a pressure applied to the object is sufficient to obtain an antioxidant signal. Based on this determination, the processor <NUM> may drive the light source <NUM> to emit light of a predetermined wavelength onto the object, and may obtain an antioxidant signal by controlling the light receiver <NUM> to receive light returning from the object. According to an example embodiment, the processor <NUM> may start to drive the light source <NUM> and/or the light receiver <NUM> upon determining that the change in the area of the contact surface satisfies a preset condition (e.g., if the change in the area of the contact surface is less than or equal to the first threshold or if such a state is maintained for a predetermined period of time).

In another example embodiment, the processor <NUM> may determine a change in the length of the contact surface by analyzing the image of the contact surface. The length of the contact surface may include a length in any direction such as a length in a long axis direction, a length in a short axis direction, a length in a diagonal direction, and the like; and the change in the length may be calculated by subtracting a preceding value from a current value or by dividing the current value by the preceding value. However, this is merely an example and the disclosure is not limited thereto. If the change in the length of the contact surface is less than or equal to a second threshold, or if the change in the length of the contact surface is less than or equal to the second threshold and such a state is maintained for a predetermined period of time, the processor <NUM> may determine that a pressure applied to the object is sufficient to obtain an antioxidant signal. Based on this determination, the processor <NUM> may drive the light source <NUM> to emit light of a predetermined wavelength onto the object, and may obtain an antioxidant signal by controlling the light receiver <NUM> to receive light returning from the object. According to an example embodiment, the processor <NUM> may start to drive the light source <NUM> and/or the light receiver <NUM> upon determining that the change in the length of the contact surface satisfies a preset condition (e.g., if the change in the length of the contact surface is less than or equal to the second threshold or if such a state is maintained for a predetermined period of time).

In yet another example embodiment, the processor <NUM> may determine the number of wrinkles in the image of the contact surface by analyzing the image of the contact surface. If the number of wrinkles is less than or equal to a third threshold, or if the number of wrinkles is less than or equal to the third threshold and such a state is maintained for a predetermined period of time, the processor <NUM> may determine that a pressure applied to the object is sufficient to obtain an antioxidant signal. Based on this determination, the processor <NUM> may drive the light source <NUM> to emit light of a predetermined wavelength onto the object, and may obtain an antioxidant signal by controlling the light receiver <NUM> to receive light returning from the object. According to an example embodiment, the processor <NUM> may start to drive the light source <NUM> and/or the light receiver <NUM> upon determining that the change in the number of wrinkles in the image of the contact surface satisfies a preset condition (e.g., if the change in the number of wrinkles is less than or equal to the third threshold or if such a state is maintained for a predetermined period of time).

The first threshold, the second threshold, and the third threshold may be preset in consideration of pressure at which the antioxidant signal is saturated and stabilized.

If the contact pressure reflection index exceeds a predetermined threshold, or even if the contact pressure reflection index is lower than or equal to a predetermined threshold, if the state is not maintained for a predetermined period of time, the processor <NUM> may determine that a pressure applied to the object is not sufficient to obtain an antioxidant signal, and may generate information on a low contact pressure and/or guidance information for guiding a user to increase the pressure applied to the object and output the generated information through an output device. The output device may include all types of devices such as, for example, a visual output device (e.g., display, etc.), an audio output device (e.g., speaker, etc.), and a tactile output device (e.g., vibrator, etc.).

Upon obtaining the antioxidant signal, the processor <NUM> may determine an antioxidant level of the object by analyzing the obtained antioxidant signal. For example, the processor <NUM> may determine the antioxidant level of the object by using an antioxidant level estimation model. Here, the antioxidant level estimation model defines a relationship between an antioxidant signal and an antioxidant level, and may be pre-generated by, for example, regression analysis or machine learning and stored in an internal or an external database of the processor <NUM>. The antioxidant level estimation model may be built in the form of a mathematical algorithm or a matching table, but is not limited thereto.

In response to an antioxidant level being lower than or equal to a predetermined threshold level, the processor <NUM> may generate information on the antioxidant level and/or information recommending a user to increase the antioxidant level and may provide the generated information to a user through the output device described above. For example, in response to an antioxidant level being lower than or equal to a predetermined threshold level, the processor <NUM> may generate recommendation information, such as "eat more vegetables," "cut down on smoking," "cut down on alcohol consumption," "exercise more," "reduce stress," and the like, and may provide the recommendation information to the user through the output device.

<FIG> is a diagram illustrating an example of a structure of an antioxidant sensor according to an example embodiment.

Referring to <FIG>, the touch sensor <NUM> may be disposed on an outer surface of the antioxidant sensor <NUM> to come into contact with an object. The light source part <NUM> and the light receiver <NUM> are provided on a substrate <NUM> and are disposed below the touch sensor <NUM>, to emit light onto the object and to receive light returning from the object, respectively. The processor <NUM> may be associated with the substrate <NUM> and the touch sensor <NUM>, to transmit and receive data to and from the touch sensor <NUM>, the light source part <NUM>, and the light receiver <NUM>.

In addition, the touch sensor <NUM> may comprise a transparent material so as not to block light emitted by the light source part <NUM> onto the object and light returning from the object.

<FIG> is a diagram illustrating an example of an antioxidant sensor <NUM> according to another example embodiment. The antioxidant sensor <NUM> of <FIG> is a device which may non-invasively obtain an antioxidant level of an object, and may be embedded in the electronic device described above or may be enclosed in a housing to be provided as a separate device.

Referring to <FIG>, the antioxidant sensor <NUM> includes a touch sensor <NUM>, a light source part <NUM>, a light receiver <NUM>, and a processor <NUM>. Here, the processor <NUM> may include one or more processors, a memory, and a combination thereof. The touch sensor <NUM>, the light receiver <NUM>, and the processor <NUM> of <FIG> have functions similar to those of the light touch sensor <NUM>, the light receiver <NUM>, and the processor <NUM>, such that overlapping descriptions will be omitted.

The light source part <NUM> includes a first light source <NUM> which emits light of a first wavelength, and a second light source <NUM> which emits light of a second wavelength.

The first light source <NUM> may be a light source used for obtaining an antioxidant signal. The first light source may include a blue wavelength which is included in an absorption band of an antioxidant substance (e.g., carotenoid).

The second light source <NUM> may be a light source used for obtaining a signal which is used for preprocessing an antioxidant signal obtained by driving the first light source <NUM> (hereinafter referred to as a preprocessing signal). The second wavelength may be a wavelength different from the first wavelength, and may include at least one of a blue wavelength, a green wavelength, and a red wavelength.

Once the object touches the touch sensor <NUM>, the processor <NUM> may extract an image of a contact surface of the object based on a sensor value of the touch sensor <NUM>, may determine a contact pressure reflection index by analyzing the extracted image of the contact surface. Based on the contact pressure reflection index, the processor <NUM> may control the first light source <NUM> and the second light source <NUM> to obtain the antioxidant signal and the preprocessing signal. Further, the processor <NUM> may preprocess the antioxidant signal based on the preprocessing signal. For example, the processor <NUM> may normalize the antioxidant signal by subtracting the preprocessing signal from the antioxidant signal or by dividing the antioxidant signal by the preprocessing signal. By normalizing the antioxidant signal, the processor <NUM> may eliminate an effect of a substance, other than an antioxidant substance, from the obtained antioxidant signal. In addition, the processor <NUM> may determine an antioxidant level of the object by analyzing the preprocessed antioxidant signal. For example, the processor <NUM> may determine the antioxidant level of the object by using an antioxidant level estimation model.

While <FIG> illustrates an example where the light source part <NUM> includes two light sources <NUM> and <NUM>, this is merely an example for convenience of explanation, and the light source part <NUM> is not limited thereto. That is, the light source part <NUM> may include a plurality of light sources (e.g., three or more light sources) which may obtain the preprocessing signal, in which case each of the plurality of light sources may emit light of the same wavelength, or may emit light of different wavelengths such as a blue wavelength, a green wavelength, or a red wavelength. In this case, the processor <NUM> may drive each of the plurality of light sources to obtain a plurality of preprocessing signals, and may preprocess the antioxidant signal by using the plurality of preprocessing signals. For example, the processor <NUM> may preprocess the antioxidant signal by performing baseline correction based on the plurality of preprocessing signals.

<FIG> is a diagram illustrating an example of an antioxidant sensor <NUM> according to another example embodiment. The antioxidant sensor <NUM> of <FIG> is a device which may non-invasively measure an antioxidant level of an object, and may be embedded in the electronic device described above or may be enclosed in a housing to be provided as a separate device.

Referring to <FIG>, the antioxidant sensor <NUM> includes a touch sensor <NUM>, a light source part <NUM>, a light receiver <NUM>, a processor <NUM>, an input part <NUM>, a memory <NUM>, a communicator <NUM>, and an output part <NUM>. Here, the touch sensor <NUM>, the light source part <NUM>, the light receiver <NUM>, and the processor <NUM> are the same as or similar to the touch sensors <NUM> and <NUM>, the light source parts <NUM> and <NUM>, the light receivers <NUM> and <NUM>, and the processors <NUM> and <NUM> described above with reference to <FIG> and <FIG>, such that detailed description thereof will be omitted.

The input part <NUM> may receive an input of one or more of various operation signals from a user. In an example embodiment, the input part <NUM> may include, for example but not limited to, a keypad, a dome switch, a touch pad (static pressure/capacitance), a jog wheel, a jog switch, a hardware (H/W) button, and the like. Particularly, the touch pad, which forms a layer structure with a display, may be called a touch screen.

The memory <NUM> may store programs or commands for operation of the antioxidant sensor <NUM>, and may store data input to and output from the antioxidant sensor <NUM>. Further, the memory <NUM> may store data processed by the antioxidant sensor <NUM>, data (e.g., antioxidant level estimation model) usable for data processing of the antioxidant sensor <NUM>, and the like.

The memory <NUM> may include at least one storage medium of a flash memory type memory, a hard disk type memory, a multimedia card micro type memory, a card type memory (e.g., an SD memory, an XD memory, etc.), a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a Read Only Memory (ROM), an Electrically Erasable Programmable Read Only Memory (EEPROM), a Programmable Read Only Memory (PROM), a magnetic memory, a magnetic disk, and an optical disk, and the like. Further, the antioxidant sensor <NUM> may operate an external storage medium, such as web storage and the like, which performs a storage function of the memory <NUM> on the Internet.

The communicator <NUM> may perform communication with an external device. For example, the communicator <NUM> may transmit, to the external device, data used by the antioxidant sensor <NUM>, processing result data of the antioxidant sensor <NUM>, and the like; or may receive, from the external device, various data usable for obtaining an antioxidant signal and/or determining an antioxidant level.

The external device may be medical equipment that uses the data used by the antioxidant sensor <NUM> or the processing result data of the antioxidant sensor <NUM>, a printer to print out results, and/or a display to display the results. In addition, the external device may be a digital TV, a desktop computer, a cellular phone, a smartphone, a tablet PC, a laptop computer, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation, an MP3 player, a digital camera, a wearable device, and the like. However, these are merely examples and the external device is not limited thereto.

The communicator <NUM> may communicate with an external device by using Bluetooth communication, Bluetooth Low Energy (BLE) communication, Near Field Communication (NFC), WLAN communication, Zigbee communication, Infrared Data Association (IrDA) communication, Wi-Fi Direct (WFD) communication, Ultra-Wideband (UWB) communication, Ant+ communication, WIFI communication, Radio Frequency Identification (RFID) communication, <NUM> communication, <NUM> communication, <NUM> communication, and the like. However, this is merely example and is not intended to be limiting.

The output part <NUM> may output the data used by the antioxidant sensor <NUM>, the processing result data of the antioxidant sensor <NUM>, and the like. In an example embodiment, the output part <NUM> may output the data used by the antioxidant sensor <NUM>, the processing result data of the antioxidant sensor <NUM>, and the like by using, for example but not limited to, at least one of an acoustic method, a visual method, and a tactile method. To this end, the output part <NUM> may include a display, a speaker, a vibrator, and the like.

<FIG> is a diagram illustrating an example of an antioxidant sensor <NUM> according to the present invention. The antioxidant sensor <NUM> of <FIG> is an apparatus for non-invasively obtaining an antioxidant level of an object, and may be embedded in the electronic device described above or may be enclosed in a housing to be provided as a separate device.

Referring to <FIG>, the antioxidant sensor <NUM> includes a light source part <NUM>, an optical fingerprint sensor <NUM>, and a processor <NUM>.

The light source part <NUM> includes at least one light source which emits light of a predetermined wavelength onto an object. The light source part <NUM> may emit visible light, including a blue wavelength which is included in an absorption band of an antioxidant substance (e.g., carotenoid), onto the object. In an example embodiment, the light source part <NUM> may be implemented as a display panel, to use a light-emitting element of the display panel as a light source.

The optical fingerprint sensor <NUM> may receive light reflected or scattered from the object. In an example embodiment, the optical fingerprint sensor <NUM> may be implemented as a complementary metal oxide semiconductor image sensor (CIS).

The optical fingerprint sensor <NUM> may include a plurality of pixels, which may be divided into at least two pixel groups including a first pixel group for generating an image of a contact surface of the object and a second pixel group for obtaining a skin spectrum of the object. A color filter may be mounted at least some pixels of the second pixel group to receive light in a wavelength band, in which an antioxidant signal may be obtained.

The optical fingerprint sensor <NUM> generates an image of a contact surface based on light received by the first pixel group.

The processor <NUM> obtains a skin spectrum of the object based on light received by the second pixel group of the optical fingerprint sensor <NUM>. In this case, the skin spectrum may be a skin absorption spectrum.

The processor <NUM> determines an antioxidant level based on the generated image of the contact surface and the obtained skin spectrum. For example, the processor <NUM> may determine a contact pressure reflection index by analyzing the image of the contact surface. Further, if the contact pressure reflection index is lower than or equal to a predetermined threshold, or if the pressure reflection index is lower than or equal to a predetermined threshold and such a state is maintained for a predetermined period of time, the processor <NUM> extracts an absorbance of a predetermined wavelength, corresponding to an antioxidant signal, from the skin spectrum, and may determine an antioxidant level of the object by analyzing the absorbance of the predetermined wavelength. The predetermined wavelength may be included in a wavelength band in which an antioxidant signal is obtained, e.g., a blue wavelength included in an absorption band of an antioxidant substance (e.g., carotenoid). The processor <NUM> may determine the antioxidant level of the object by using, for example, the antioxidant level estimation model described above. In addition, the contact pressure reflection index may include at least one of a change in the area of the contact surface, a change in the length of the contact surface, and a change in the number of wrinkles in the image of the contact surface.

In an example embodiment, the processor <NUM> may determine a change in the area of the contact surface by analyzing the image of the contact surface. In this case, the change in the area may be calculated by subtracting a preceding value from a current value or by dividing the current value by the preceding value. However, this is merely an example and the disclosure is not limited thereto. Further, if the change in the area of the contact surface is less than or equal to a first threshold, or if the change in the area of the contact surface is less than or equal to the first threshold and such a state is maintained for a predetermined period of time, the processor <NUM> may determine that the skin spectrum is measured under sufficient pressure, and may determine the antioxidant level of the object by analyzing the skin spectrum.

In another example embodiment, the processor <NUM> may determine a change in the length of the contact surface by analyzing the image of the contact surface. In this case, the length of the contact surface may include a length in any direction such as a length in a long axis direction, a length in a short axis direction, a length in a diagonal direction, and the like; and the change in the length may be calculated by, for example, subtracting a preceding value from a current value or by dividing the current value by the preceding value. If the change in the length of the contact surface is less than or equal to a second threshold, or if the change in the length of the contact surface is less than or equal to the second threshold and such a state is maintained for a predetermined period of time, the processor <NUM> may determine that the skin spectrum is measured under sufficient pressure, and may determine the antioxidant level of the object by analyzing the skin spectrum.

In yet another example embodiment, the processor <NUM> may determine the number of wrinkles in the image of the contact surface by analyzing the image of the contact surface. If the number of wrinkles is less than or equal to a third threshold, or if the number of wrinkles is less than or equal to the third threshold and such a state is maintained for a predetermined period of time, the processor <NUM> may determine that the skin spectrum is measured under sufficient pressure, and may determine the antioxidant level of the object by analyzing the skin spectrum.

Before determining the antioxidant level of the object, the processor <NUM> may preprocess the absorbance of the predetermined wavelength corresponding to the antioxidant signal. In an example embodiment, the processor <NUM> may extract an absorbance which is used for preprocessing (hereinafter a preprocessing absorbance), corresponding to the preprocessing signal, from the skin spectrum, and may preprocess the absorbance of the predetermined wavelength based on the extracted preprocessing absorbance. For example, the processor <NUM> may extract the preprocessing absorbance at one or more wavelengths, and may preprocess the absorbance of the predetermined wavelength by performing normalization or baseline correction of the absorbance of the predetermined wavelength based on the extracted preprocessing absorbance. In this manner, the processor <NUM> may eliminate an effect of a substance, other than an antioxidant substance, from the absorbance of the predetermined wavelength corresponding to the antioxidant signal. The one or more wavelengths, at which the preprocessing absorbance is extracted, may be a wavelength different from the predetermined wavelength corresponding to the antioxidant signal, and may be a blue wavelength, a green wavelength, or a red wavelength.

If the contact pressure reflection index exceeds a predetermined threshold, or even if the contact pressure reflection index is lower than or equal to a predetermined threshold, if such a state is not maintained for a predetermined period of time, the processor <NUM> may determine that the skin spectrum is not measured with a sufficient pressure. In an example embodiment, the processor <NUM> may generate information on a low contact pressure and/or guidance information for guiding a user to increase a pressure applied to an object and output the generated information through the output device described above.

In response to an antioxidant level being lower than or equal to a predetermined threshold level, the processor <NUM> may generate information, for example, information on the antioxidant level and/or recommendation information recommending a user to increase the antioxidant level and may provide the generated information to the user through the output device described above.

<FIG> is a diagram illustrating an example of a structure of an antioxidant sensor according to another example embodiment.

Referring to <FIG>, a cover glass <NUM> may be disposed on an outer surface of the antioxidant sensor <NUM> to come into contact with an object. The light source part <NUM> (e.g., display panel) is disposed below the cover glass <NUM>, and may emit light onto the object touching the cover glass <NUM>. The optical fingerprint sensor <NUM> (e.g., CIS sensor) is disposed below the light source part <NUM> to receive light returning from the object. The processor <NUM> may be connected to the light source part <NUM> and the optical fingerprint sensor <NUM> to transmit and receive data to and from the light source part <NUM> and the optical fingerprint sensor <NUM>.

<FIG> is a diagram illustrating an example of an antioxidant sensor <NUM> according to another example embodiment. The antioxidant sensor <NUM> of <FIG> is a device for non-invasively measuring an antioxidant level of an object, and may be embedded in the electronic device described above or may be enclosed in a housing to be provided as a separate device.

Referring to <FIG>, the antioxidant sensor <NUM> includes a touch sensor <NUM>, a spectrum measurer <NUM>, and a processor <NUM>. Here, the processor <NUM> may include one or more processors, a memory, and/or a combination thereof.

The touch sensor <NUM> may detect a contact with an object. The touch sensor <NUM> may be of one or more of various types such as a capacitive type, a resistive type, an infrared type, an acoustic wave type, a pressure type, and the like.

The spectrum measurer <NUM> may measure a skin spectrum according to a predetermined control signal. The skin spectrum may be a skin absorption spectrum. The spectrum measurer <NUM> will be described in detail later with reference to <FIG> and <FIG>.

The processor <NUM> may analyze the extracted image of the contact surface, and may obtain a skin spectrum of the object by controlling the spectrum measurer <NUM> based on the analysis of the extracted image of the contact surface. For example, the processor <NUM> may determine a contact pressure reflection index by analyzing the extracted image of the contact surface; and if the contact pressure reflection index is lower than or equal to a predetermined threshold, the processor <NUM> may control the spectrum measurer <NUM> to measure the skin spectrum of the object. Alternatively, if the contact pressure reflection index is lower than or equal to a predetermined threshold and such a state is maintained for a predetermined period of time, the processor <NUM> may control the spectrum measurer <NUM> to measure the skin spectrum of the object. Here, the contact pressure reflection index may include at least one of a change in the area of the contact surface, a change in the length of the contact surface, and the number of wrinkles in the image of the contact surface.

In an example embodiment, the processor <NUM> may determine the change in the area of the contact surface by analyzing the image of the contact surface. The change in the area may be calculated by, for example, subtracting a preceding value from a current value or by dividing the current value by the preceding value. Further, if the change in the area of the contact surface is less than or equal to a first threshold, or if the change in the area of the contact surface is less than or equal to the first threshold and such a state is maintained for a predetermined period of time, the processor <NUM> may control the spectrum measurer <NUM> to measure the skin spectrum of the object.

In another example embodiment, the processor <NUM> may determine the change in the length of the contact surface by analyzing the image of the contact surface. The length of the contact surface may include a length in any direction such as a length in a long axis direction, a length in a short axis direction, a length in a diagonal direction, and the like; and the change in the length may be calculated by, for example, subtracting a preceding value from a current value or by dividing the current value by the preceding value. In addition, if the change in the length of the contact surface is less than or equal to a second threshold, or if the change in the length of the contact surface is less than or equal to the second threshold and such a state is maintained for a predetermined period of time, the processor <NUM> may control the spectrum measurer <NUM> to measure the skin spectrum of the object.

In yet another example embodiment, the processor <NUM> may determine the number of wrinkles in the image of the contact surface by analyzing the image of the contact surface. If the number of wrinkles is less than or equal to a third threshold value, or if the number of wrinkles is less than or equal to the third threshold value and such a state is maintained for a predetermined period of time, the processor <NUM> may control the spectrum measurer <NUM> to measure the skin spectrum of the object.

If the contact pressure reflection index exceeds a predetermined threshold, or even if the contact pressure reflection index is lower than or equal to a predetermined threshold, if such a state is not maintained for a predetermined period of time, the processor <NUM> may generate information on a low contact pressure and/or guidance information for guiding a user to increase a pressure applied to an object and output the generated information through an output device described above.

Upon measuring the skin spectrum, the processor <NUM> may determine an antioxidant level of the object by analyzing the measured skin spectrum. For example, the processor <NUM> may extract an absorbance of a predetermined wavelength, corresponding to an antioxidant signal, from the skin spectrum, and may determine the antioxidant level of the object by analyzing the absorbance of the predetermined wavelength corresponding to the antioxidant signal. In this case, the predetermined wavelength corresponding to the antioxidant signal may be included in a wavelength band in which an antioxidant signal is obtained, e.g., a blue wavelength included in an absorption band of an antioxidant substance (e.g., carotenoid). The processor <NUM> may determine the antioxidant level of the object by using the antioxidant level estimation model described above.

Before determining the antioxidant level of the object, the processor <NUM> may preprocess the absorbance of the predetermined wavelength corresponding to the antioxidant signal. In an example embodiment, the processor <NUM> may extract an absorbance which is used for preprocessing (hereinafter a preprocessing absorbance), corresponding to the preprocessing signal, from the skin spectrum, and may preprocess the absorbance of the predetermined wavelength, corresponding to the antioxidant signal, based on the extracted preprocessing absorbance. For example, the processor <NUM> may extract the preprocessing absorbance at one or more wavelengths, and may preprocess the absorbance of the predetermined wavelength, corresponding to the antioxidant signal, by performing normalization or baseline correction of the absorbance of the predetermined wavelength, corresponding to the antioxidant signal, based on the extracted preprocessing absorbance. In this manner, the processor <NUM> may eliminate an effect of a substance, other than an antioxidant substance, from the absorbance of the predetermined wavelength corresponding to the antioxidant signal. In this case, the one or more wavelengths, at which the preprocessing absorbance is extracted, may be a wavelength different from the predetermined wavelength corresponding to the antioxidant signal, and may be a blue wavelength, a green wavelength, or a red wavelength.

If the contact pressure reflection index exceeds a predetermined threshold, or even if the contact pressure reflection index is lower than or equal to a predetermined threshold, if such a state is not maintained for a predetermined period of time, the processor <NUM> may generate information on a low contact pressure and/or guidance information for guiding a user to increase a pressure applied to an object and output the generated information through the output device described above.

In response to an antioxidant level being lower than or equal to a predetermined threshold level, the processor <NUM> may generate information on the antioxidant level and/or information recommending a user to increase the antioxidant level and may provide the generated information to a user through the output device described above.

<FIG> is a diagram illustrating an example of a spectrum measurer <NUM> according to an example embodiment. The spectrum measurer <NUM> of <FIG> may be an example of the spectrum measurer <NUM> of <FIG>.

Referring to <FIG>, the spectrum measurer <NUM> includes a light source part <NUM>, a photodetector <NUM>, and a spectrum reconstructor <NUM>.

The light source part <NUM> may include a plurality of light sources which emit light of different wavelengths onto an object. Each of the light sources may emit visible light, having a blue wavelength, a green wavelength, and a red wavelength, onto an object. In an example embodiment, each of the light sources may include a light emitting diode (LED), an organic light emitting diode (OLED), a Quantum dot light-emitting diode (QLED), a laser diode, a fluorescent body, and the like, and may include a white light source. The light source part <NUM> may further include at least one optical element (e.g., mirror, etc.) for directing the light emitted by each of the light sources toward a desired position of an object.

The photodetector <NUM> may receive light reflected or scattered from a user's skin, and may convert the received light into an electric signal. The photodetector <NUM> may include a photo diode, a photo transistor (PTr), a charge-coupled device image sensor (CCD image sensor), a complementary metal oxide semiconductor image sensor (CIS), and the like. Further, the photodetector <NUM> may not be necessarily a single device, and may be formed as an array of a plurality of devices.

There may be various numbers and arrangements of light sources and photodetectors, and the number and arrangement thereof may vary according to a purpose of use of the spectrum measurer <NUM>, the size and shape of the electronic device in which the spectrum measurer <NUM> is embedded, and the like.

The spectrum reconstructor <NUM> may obtain a skin spectrum of an object by reconstructing a spectrum using the received light and a light source spectrum. The light source spectrum may refer to a spectrum of light emitted by each light source, and information on the light source spectrum may be pre-stored in an internal or an external database.

In an example embodiment, the spectrum reconstructor <NUM> may obtain a skin spectrum of an object using the following Equation <NUM>.

Herein, R denotes the skin spectrum of the object, Si denotes the light source spectrum, SPD denotes sensitivity for each wavelength of the photodetector, and MPD denotes a measured value of the photodetector.

<FIG> is a diagram illustrating an example of a spectrum measurer <NUM> according to another example embodiment. The spectrum measurer <NUM> of <FIG> may be an example of the spectrum measurer <NUM> of <FIG>.

Referring to <FIG>, the spectrum measurer <NUM> includes a light source part <NUM> and a spectrometer <NUM>.

The light source part <NUM> may include one light source which emits white light onto an object or a plurality of light sources which emit light of different wavelengths onto the object. The light source part <NUM> may further include at least one optical element (e.g., mirror, etc.) for directing the light emitted by each of the light sources toward a desired position of an object.

The spectrometer <NUM> may receive light reflected or scattered from the object, and may generate a skin spectrum by separating the received light. The spectrometer <NUM> may be of one or more various types, such as an interference spectrometer, a grating spectrometer, a prism spectrometer, and the like; and may include various optical elements, such as a diffraction grating, a prism, a hologram filter, a dielectric lens, or a combination thereof.

<FIG> is a diagram illustrating a method of obtaining an antioxidant signal according to the present invention. The antioxidant signal obtaining method of <FIG> may be performed by any one of the antioxidant sensors <NUM>, <NUM>, and <NUM> of <FIG>, <FIG>, and <FIG>.

Referring to <FIG>, the antioxidant sensor detects a contact with an object using the touch sensor in <NUM>.

The antioxidant sensor extracts an image of a contact surface of the object based on a sensor value of the touch sensor in <NUM>. For example, the antioxidant sensor may extract the image of the contact surface by performing contouring based on the sensor value of the touch sensor.

The antioxidant sensor analyzes the extracted image of the contact surface and obtains an antioxidant signal based on the analysis in <NUM>. The antioxidant signal may be a signal associated with carotenoid accumulated in the epidermis. The antioxidant sensor determines a contact pressure reflection index based on the image of the contact surface, may compare the contact pressure reflection index with a predetermined threshold, and may obtain the antioxidant signal based on a result the comparison. For example, the antioxidant sensor may selectively obtain the antioxidant signal based on a result of comparison between the contact pressure reflection index and the predetermined threshold. The contact pressure reflection index may include at least one of a change in the area of the contact surface, a change in the length of the contact surface, and the number of wrinkles in the image of the contact surface. The predetermined threshold may be preset in consideration of pressure at which the antioxidant signal is saturated and stabilized.

<FIG> is a diagram illustrating an example of a method of obtaining an antioxidant signal based on analysis of an image of a contact surface according to an example embodiment. The antioxidant signal obtaining method of <FIG> may be an example of the obtaining of an antioxidant signal in <NUM> of <FIG>.

Referring to <FIG>, the antioxidant sensor determines a contact pressure reflection index by analyzing the image of the contact surface in <NUM>, and may compare the contact pressure reflection index with a predetermined threshold TH in <NUM>. In response to the contact pressure reflection index being lower than or equal to the predetermined threshold, the antioxidant sensor may obtain the antioxidant signal by emitting light of a predetermined wavelength onto an object in <NUM> (or by controlling to start emitting light of a predetermined wavelength onto the object). The predetermined wavelength may include a blue wavelength.

In an example embodiment, the antioxidant sensor may determine a change in the area of the contact surface by analyzing the image of the contact surface. Further, in response to the change in the area of the contact surface being less than a first threshold, the antioxidant sensor may emit light of a predetermined wavelength onto an object (or by control to start emitting light of a predetermined wavelength onto the object), and may obtain an antioxidant signal by receiving light returning from the object.

According to the present invention, the antioxidant sensor determines a change in the length of the contact surface by analyzing the image of the contact surface. Further, in response to the change in the length of the contact surface being less than a second threshold, the antioxidant sensor may emit light of a predetermined wavelength onto an object (or by control to start emitting light of a predetermined wavelength onto the object), and may obtain an antioxidant signal by receiving light returning from the object.

In yet another example embodiment, the antioxidant sensor may determine the number of wrinkles in the image of the contact surface by analyzing the image of the contact surface. Further, in response to the number of wrinkles being less than or equal to a third threshold, the antioxidant sensor may emit light of a predetermined wavelength onto an object (or by control to start emitting light of a predetermined wavelength onto the object), and may obtain an antioxidant signal by receiving light returning from the object.

In addition, the antioxidant sensor may further consider a duration of a status of the contact pressure reflection index in addition to a magnitude thereof. For example, in response to determining that the contact pressure reflection index has a status of being lower than or equal to a predetermined threshold and such a state being maintained for a predetermined period of time, the antioxidant sensor may obtain the antioxidant signal.

The antioxidant sensor may obtain a preprocessing signal by emitting light of another wavelength onto the object in <NUM>. For example, the antioxidant sensor may emit light of another wavelength onto the object, and may obtain the preprocessing signal by receiving light of another wavelength returning from the object. The another wavelength may be a wavelength different from the predetermined wavelength used for obtaining the antioxidant signal, and may include at least one of a blue wavelength, a green wavelength, and a red wavelength.

The antioxidant sensor may preprocess the antioxidant signal based on the preprocessing signal in <NUM>. For example, the antioxidant sensor may normalize the antioxidant signal by subtracting the preprocessing signal from the antioxidant signal or by dividing the antioxidant signal by the preprocessing signal. In this manner, the antioxidant sensor may eliminate an effect of a substance, other than an antioxidant substance, from the obtained antioxidant signal.

In response to the contact pressure reflection index exceeding a predetermined threshold, the antioxidant sensor may generate information on a low contact pressure and/or guidance information for guiding a user to increase a pressure applied to an object and may output the generated information through the output device described above in <NUM>.

<FIG> is a diagram illustrating an example of a method of obtaining an antioxidant signal according to another example embodiment. The antioxidant signal obtaining method of <FIG> may be performed by any one of the antioxidant sensors <NUM>, <NUM>, and <NUM> of <FIG>, <FIG>, and <FIG>. Operations <NUM>, <NUM>, and <NUM> of <FIG> are the same as or similar to the operations <NUM>, <NUM> and <NUM> of <FIG>, such that detailed description thereof will be omitted.

Referring to <FIG>, the antioxidant sensor may determine an antioxidant level of an object by analyzing an obtained antioxidant signal in <NUM>. For example, the antioxidant sensor may determine the antioxidant level of the object by using an antioxidant level estimation model. Here, the antioxidant level estimation model defines a relationship between an antioxidant signal and an antioxidant level, and may be pre-generated by, for example, regression analysis or machine learning.

In response to the antioxidant level being lower than or equal to a predetermined threshold level, the antioxidant sensor may generate information on the antioxidant level and/or information recommending a user to increase the antioxidant level. For example, the antioxidant sensor may generate recommendation information, such as "eat more vegetables," "cut down on smoking," "cut down on alcohol consumption," "exercise more," "reduce stress," and the like, and may provide the recommendation information to a user through an output device.

<FIG> is a diagram illustrating an example of a method of obtaining an antioxidant signal according to another example embodiment. The antioxidant signal obtaining method of <FIG> may be performed by the antioxidant sensor <NUM> of <FIG>.

Referring to <FIG>, the antioxidant sensor may emit light onto an object, and may generate an image of a contact surface of the object by receiving light returning from the object in <NUM>. Further, the antioxidant sensor may obtain a skin spectrum of the object based on the received light in <NUM>.

The antioxidant sensor may determine an antioxidant level based on the image of the contact surface and the skin spectrum in <NUM>.

<FIG> is a diagram illustrating an example of determining an antioxidant level according to an example embodiment. The antioxidant level determining method of <FIG> may be an example of the determining of an antioxidant level in <NUM> of <FIG>.

Referring to <FIG>, the antioxidant sensor may determine a contact pressure reflection index by analyzing an image of a contact surface in <NUM>, and may compare the contact pressure reflection index with a predetermined threshold TH in <NUM>.

In response to the contact pressure reflection index being lower than or equal to the predetermined threshold, the antioxidant sensor may extract an absorbance of a predetermined wavelength, corresponding to an antioxidant signal, from a skin spectrum in <NUM>, and may extract an absorbance of another wavelength, which is used for preprocessing (hereinafter a preprocessing absorbance) corresponding to a preprocessing signal in <NUM>. The predetermined wavelength corresponding to the antioxidant signal may be a blue wavelength; and the another wavelength may be a wavelength different from the predetermined wavelength corresponding to the antioxidant signal, and may be a blue wavelength, a green wavelength, or a red wavelength.

In addition, the antioxidant sensor may further consider a duration of a status of the contact pressure reflection index in addition to a magnitude thereof. For example, in response to the contact pressure reflection index being lower than or equal to a predetermined threshold and such a state being maintained for a predetermined period of time, the antioxidant sensor may extract the absorbance of the predetermined wavelength corresponding to the antioxidant signal and the preprocessing absorbance.

The antioxidant sensor may preprocess the absorbance of the predetermined wavelength, corresponding to the antioxidant signal, based on the preprocessing absorbance in <NUM>. The antioxidant sensor may normalize the absorbance of the predetermined wavelength corresponding to the antioxidant signal by, for example, subtracting the preprocessing absorbance from the absorbance of the predetermined wavelength corresponding to the antioxidant signal or by dividing the absorbance of the predetermined wavelength corresponding to the antioxidant signal by the preprocessing absorbance. By normalizing the absorbance of the predetermined wavelength, the antioxidant sensor may eliminate an effect of a substance, other than an antioxidant substance, from the absorbance of the predetermined wavelength corresponding to the antioxidant signal.

The antioxidant sensor may determine an antioxidant level of the object by analyzing the preprocessed absorbance of the predetermined wavelength in <NUM>.

In response to the contact pressure reflection index exceeding a predetermined threshold, the antioxidant sensor may generate information on a low contact pressure and/or guidance information for guiding a user to increase a pressure applied to the object, and may output the generated information to the user through the output device described above in <NUM>.

In addition, in response to the antioxidant level being lower than or equal to a predetermined threshold level, the antioxidant sensor may generate information on the antioxidant level and/or information recommending a user to increase the antioxidant level, and may output the generated information to the user through the output device.

Referring to <FIG>, the antioxidant sensor may detect a contact with an object through a touch sensor in <NUM>.

The antioxidant sensor may extract an image of a contact surface of the object based on a sensor value of the touch sensor in <NUM>. For example, the antioxidant sensor may extract the image of the contact surface by performing contouring based on the sensor value of the touch sensor.

The antioxidant sensor may analyze the extracted image of the contact surface and may obtain a skin spectrum of the object based on the analysis in <NUM>. For example, the antioxidant sensor may determine a contact pressure reflection index based on the image of the contact surface, may compare the contact pressure reflection index with a predetermined threshold, and may obtain the skin spectrum of the object based on the comparison.

The antioxidant sensor may determine an antioxidant level of the object by analyzing the obtained skin spectrum in <NUM>.

<FIG> is a diagram illustrating an example of a method of obtaining a skin spectrum according to an example embodiment. The skin spectrum obtaining method of <FIG> may be an example of the obtaining of a skin spectrum in <NUM> of <FIG>.

Referring to <FIG>, the antioxidant sensor may determine a contact pressure reflection index by analyzing an image of a contact surface in <NUM>, and may compare the contact pressure reflection index with a predetermined threshold TH in <NUM>. Further, in response to the contact pressure reflection index being lower than or equal to a predetermined threshold, the antioxidant sensor may obtain the skin spectrum of the object in <NUM>.

In addition, the antioxidant sensor may further consider a duration of a status of the contact pressure reflection index in addition to a magnitude thereof. For example, in response to the contact pressure reflection index being lower than or equal to a predetermined threshold and such a state is maintained for a predetermined period of time, the antioxidant sensor may obtain the skin spectrum of the object.

In response to the contact pressure reflection index exceeding a predetermined threshold, the antioxidant sensor may generate information on a low contact pressure and/or guidance information for guiding a user to increase a pressure applied to the object, and may provide the generated information to the user through the output device described above in <NUM>.

<FIG> is a diagram illustrating an example of a method of determining an antioxidant level of an object by analyzing a skin spectrum. The antioxidant level determining method of <FIG> may be an example of the determining of an antioxidant level in <NUM> of <FIG>.

Referring to <FIG>, the antioxidant sensor may extract an absorbance of a predetermined wavelength, corresponding to an antioxidant signal, from a skin spectrum in <NUM>, and may extract an absorbance of another wavelength corresponding to a preprocessing signal, which is used for preprocessing (hereinafter a preprocessing absorbance) in <NUM>. The predetermined wavelength corresponding to the antioxidant signal may be a blue wavelength; and the another wavelength may be a wavelength different from the predetermined wavelength corresponding to the antioxidant signal, and may be a blue wavelength, a green wavelength, or a red wavelength.

The antioxidant sensor may preprocess the absorbance of the predetermined wavelength based on the preprocessing absorbance in <NUM>. The antioxidant sensor may normalize the absorbance of the predetermined wavelength corresponding to the antioxidant signal by, for example, subtracting the preprocessing absorbance from the absorbance of the predetermined wavelength or by dividing the absorbance of the predetermined wavelength by the preprocessing absorbance. By normalizing the absorbance of the predetermined wavelength, the antioxidant sensor may eliminate an effect of a substance, other than an antioxidant substance, from the absorbance of the predetermined wavelength corresponding to the antioxidant signal.

In response to the antioxidant level being lower than or equal to a predetermined threshold level, the antioxidant sensor may generate information on the antioxidant level and/or information recommending a user to increase the antioxidant level, and may provide the generated information to a user through an output device.

<FIG> is a diagram illustrating an example of an antioxidant sensor according to another example embodiment. Referring to <FIG>, the antioxidant sensor <NUM> includes a fingerprint sensor <NUM>, the light source part <NUM>, the light receiver <NUM>, and a processor <NUM>. Here, the light source part <NUM> and the light receiver <NUM> are the same as those described above with reference to <FIG>, such that detailed description thereof will be omitted.

Once an object touches the fingerprint sensor <NUM>, the fingerprint sensor <NUM> may detect a contact with the object, and may generate an image of a contact surface of the object.

The processor <NUM> may recognize a fingerprint by analyzing the image of the contact surface which is generated by the fingerprint sensor <NUM>, and may recognize a user by comparing the recognized fingerprint with pre-stored fingerprint data.

The processor <NUM> may analyze the image of the contact surface which is generated by the fingerprint sensor <NUM>, and may obtain an antioxidant signal by controlling the light source <NUM> based on the analysis of the image of the contact surface. For example, the processor <NUM> may determine a contact pressure reflection index by analyzing the generated image of the contact surface; and in response to the contact pressure reflection index being lower than or equal to a predetermined threshold, the processor <NUM> may drive the light source <NUM> to obtain an antioxidant signal of the object. Here, the contact pressure reflection index may include at least one of a change in the area of the contact surface, a change in the length of the contact surface, the number of wrinkles in the image of the contact surface, and a degree of the fingerprint being smudged.

In an example embodiment, the processor <NUM> may determine a change in the area of the contact surface by analyzing the image of the contact surface. The change in the area may be calculated by, for example, subtracting a preceding value from a current value or by dividing the current value by the preceding value. Further, in response to the change in the area of the contact surface being less than or equal to a first threshold, the processor <NUM> may drive the light source <NUM> to emit light of a predetermined wavelength onto the object, and may obtain an antioxidant signal by controlling the light receiver <NUM> to receive light returning from the object.

In another example embodiment, the processor <NUM> may determine a change in the length of the contact surface by analyzing the image of the contact surface. The length of the contact surface may include a length in any direction such as a length in a long axis direction, a length in a short axis direction, a length in a diagonal direction, and the like; and the change in the length may be calculated by, for example, subtracting a preceding value from a current value or by dividing the current value by the preceding value. In response to the change in the length of the contact surface being less than or equal to a second threshold, the processor <NUM> may drive the light source <NUM> to emit light of a predetermined wavelength onto the object, and may obtain an antioxidant signal by controlling the light receiver <NUM> to receive light returning from the object.

In yet another example embodiment, the processor <NUM> may determine the number of wrinkles in the image of the contact surface by analyzing the image of the contact surface. If the number of wrinkles is less than or equal to a third threshold, the processor <NUM> may drive the light source <NUM> to emit light of a predetermined wavelength onto the object, and may obtain an antioxidant signal by controlling the light receiver <NUM> to receive light returning from the object.

In still another example embodiment, the processor <NUM> may determine a degree of the fingerprint being smudged by analyzing the image of the contact surface. The degree of the fingerprint being smudged may be determined by comparing a current image frame with a preceding image frame. Further, in response to the degree of smudging of the fingerprint being less than a fourth threshold, the processor <NUM> may drive the light source <NUM> to emit light of a predetermined wavelength onto the object, and may obtain an antioxidant signal by controlling the light receiver <NUM> to receive light returning from the object.

The first threshold, the second threshold, the third threshold, and the fourth threshold may be preset in consideration of pressure at which the antioxidant signal is saturated and stabilized.

In addition, the antioxidant sensor <NUM> may further consider a duration of a status of the contact pressure reflection index in addition to a magnitude thereof. For example, in response to the contact pressure reflection index being lower than or equal to a predetermined threshold and such a state is maintained for a predetermined period of time, the processor <NUM> may obtain the antioxidant signal.

If the contact pressure reflection index exceeds a predetermined threshold, or even if the contact pressure reflection index is less than or equal to a predetermined threshold, if such a state is not maintained for a predetermined period of time, the processor <NUM> may determine that a pressure applied to an object is not sufficient to obtain an antioxidant signal, and may generate information on a low contact pressure and/or information for guiding a user to increase the pressure applied to an object and output the generated information through the output device described above.

The disclosure can be realized as a computer-readable code written on a computer-readable recording medium. The computer-readable recording medium may be any type of recording device in which data is stored in a computer-readable manner. Examples of the computer-readable recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disc, an optical disk, and the like. Further, the computer-readable recording medium can be distributed over a plurality of computer systems connected to a network so that a computer-readable recording medium is written thereto and executed therefrom in a decentralized manner.

At least one of the components, elements, modules or units described herein may be embodied as various numbers of hardware, software and/or firmware structures that execute respective functions described above, according to an example embodiment. For example, at least one of these components, elements or units may use a direct circuit structure, such as a memory, a processor, a logic circuit, a look-up table, etc. that may execute the respective functions through controls of one or more microprocessors or other control apparatuses. Also, at least one of these components, elements or units may be specifically embodied by a module, a program, or a part of code, which contains one or more executable instructions for performing specified logic functions, and executed by one or more microprocessors or other control apparatuses. Also, at least one of these components, elements or units may further include or implemented by a processor such as a central processing unit (CPU) that performs the respective functions, a microprocessor, or the like. Two or more of these components, elements or units may be combined into one single component, element or unit which performs all operations or functions of the combined two or more components, elements of units. Also, at least part of functions of at least one of these components, elements or units may be performed by another of these components, element or units. Further, although a bus is not illustrated in the block diagrams, communication between the components, elements or units may be performed through the bus. Functional aspects of the above example embodiments may be implemented in algorithms that execute on one or more processors. Furthermore, the components, elements or units represented by a block or processing steps may employ any number of related art techniques for electronics configuration, signal processing and/or control, data processing and the like.

Claim 1:
A method of obtaining an antioxidant signal, the method comprising:
detecting (<NUM>, <NUM>) a contact with an object using a touch sensor;
extracting (<NUM>, <NUM>), by a processor (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>), an image of a contact surface of the object based on a sensor value of the touch sensor; and
analyzing, by the processor (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>), the extracted image of the contact surface, and obtaining (<NUM>, <NUM>), by the processor, an antioxidant signal of the object by driving a light source to emit light of a first wavelength onto the object based on a result of the analyzing and by controlling a light receiver to receive light returning from the object,
wherein obtaining (<NUM>, <NUM>) the antioxidant signal comprises determining, by the processor (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>), a contact pressure reflection index by analyzing the extracted image of the contact surface; and based on the contact pressure reflection index being lower than or equal to a predetermined threshold, obtaining, by the processor, the antioxidant signal of the object, and
wherein the contact pressure reflection index comprises a change in a length of the contact surface,
wherein the change in length of the contact surface is calculated by subtracting a preceding value from a current value, or by dividing the current value by the preceding value.