CN105982672B - Skin detection method and skin detection device - Google Patents
Skin detection method and skin detection device Download PDFInfo
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- CN105982672B CN105982672B CN201510095709.9A CN201510095709A CN105982672B CN 105982672 B CN105982672 B CN 105982672B CN 201510095709 A CN201510095709 A CN 201510095709A CN 105982672 B CN105982672 B CN 105982672B
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- 238000001514 detection method Methods 0.000 title claims abstract description 35
- 230000000875 corresponding effect Effects 0.000 claims abstract description 15
- 230000002596 correlated effect Effects 0.000 claims abstract description 12
- 230000003020 moisturizing effect Effects 0.000 claims description 15
- 230000014759 maintenance of location Effects 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 5
- 238000002847 impedance measurement Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims 2
- 238000012423 maintenance Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 230000036555 skin type Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
A skin detection method is executed by a skin detection device and comprises the following steps: (A) measuring the impedance of skin after a preset time value and generating an impedance measuring signal indicating a current impedance value; (B) obtaining an impedance gain according to the current impedance value and the preset time value, wherein the impedance gain is positively correlated with the current impedance value and negatively correlated with the preset time value; (C) generating an impedance function according to the impedance gain and a time function which exponentially changes along with a time parameter, wherein the impedance function standardizes the positive correlation corresponding relation between a plurality of impedance values and a plurality of time values; and (D) obtaining the time value corresponding to the critical impedance value as a critical time value according to the critical impedance value and the impedance function.
Description
Technical Field
The present invention relates to a method and apparatus, and more particularly, to a skin detection method and apparatus for detecting the moisturizing effect of a care product that has been applied to a human body.
Background
Since 70% of human body is water, maintaining the water content of human body and skin can make human body healthy and bright, moisture retention and maintenance are the most important maintenance in skin care. Various moisturizing care products are available on the market, but the moisturizing effect and the persistence of the care products are different due to different skin types of each person, so that a detection device for detecting the moisture content of the skin is developed, and when a user wipes the care products, the detection device can be used for detecting the skin after the user wipes the care products, so that the current moisture content of the skin can be known.
However, although the current skin moisturizing effect after the skin care product is used can be known by using the detection device, the duration of the moisturizing effect cannot be known, and if the moisturizing effect of the skin care product is to be known, the current skin moisture content can be measured only regularly by using the detection device, which causes inconvenience in use.
Disclosure of Invention
A first object of the present invention is to provide a skin test method capable of detecting a moisturizing duration of a skin after being rubbed with a skin care product.
The skin detection method is executed by a skin detection device, the skin detection device stores a critical impedance value, and the skin detection method comprises a step (A), a step (B), a step (C) and a step (D).
(A) The impedance of the skin is measured after a preset time value and an impedance measurement signal indicating a current impedance value is generated.
(B) Obtaining an impedance gain according to the current impedance value and the preset time value, wherein the impedance gain is positively correlated with the current impedance value and negatively correlated with the preset time value.
(C) An impedance function is generated according to the impedance gain and a time function which exponentially changes along with a time parameter, and the impedance function standardizes the positive correlation corresponding relation between a plurality of impedance values and a plurality of time values.
(D) The time value corresponding to the critical impedance value is obtained according to the critical impedance value and the impedance function and is used as a critical time value.
A second object of the present invention is to provide a skin test device capable of detecting a moisture retention duration after a skin is wiped with a skin care product.
Therefore, the skin detection device comprises a measurement module and a control module.
The measuring module measures the impedance of skin after a preset time value and generates an impedance measuring signal indicating a current impedance value.
The control module stores a critical impedance value, is electrically connected with the measuring module to receive the impedance measuring signal and obtains an impedance gain according to the current impedance value and the preset time value, wherein the impedance gain is positively correlated with the current impedance value and negatively correlated with the preset time value.
The control module generates an impedance function according to the impedance gain and a time function which exponentially changes along with a time parameter, and the impedance function standardizes the positive correlation corresponding relation between a plurality of impedance values and a plurality of time values.
The control module obtains the time value corresponding to the critical impedance value according to the critical impedance value and the impedance function to be used as a critical time value.
The invention has the beneficial effects that: the moisture retention duration of the skin rubbed by the skin care product can be obtained by finding the impedance function of the skin rubbed by the skin care product, calculating the critical time value according to the impedance function and the critical impedance value, and further calculating the moisture retention duration.
Drawings
FIG. 1 is a block diagram illustrating an embodiment of a skin detection device of the present invention;
FIG. 2 is a flowchart illustrating a skin detection method performed by the embodiment; and
FIG. 3 is a graph illustrating the relationship between a plurality of time values and a plurality of impedance values of an impedance function according to the embodiment.
Detailed Description
Referring to fig. 1 and 2, an embodiment of the skin test apparatus of the present invention is adapted to test a moisture retention duration of a skin of a user for maintaining moisture retention of the skin after the user wipes a skin care product, and the skin test apparatus includes a measuring module 1, a control module 2, a display module 3, and a communication module 4.
The measuring module 1 is used for measuring an impedance value of the skin.
Wiping the skin of the skin care product, wherein the skin humidity becomes lower and lower along with time, the impedance value of the skin is measured through the measuring module 1, the impedance value also becomes higher and higher along with time, each impedance value corresponds to a respective relative humidity value, and the impedance value and the relative humidity value are in a corresponding relation of exponential negative correlation, for example, when the relative humidity of the skin is 35%, the corresponding impedance value is about 500k Ω; when the relative humidity of the skin is 45%, the corresponding impedance value is about 200k Ω. Therefore, it is estimated that the change in the relative humidity value of the skin is caused by observing the change in the impedance value, and the relative humidity value gradually decreases as the impedance value gradually increases.
The control module 2 stores a critical impedance value and is electrically connected to the measurement module 1. In this embodiment, the critical impedance value is set to an average impedance value of eighth hours after the skin of a plurality of users are wiped with the skin care product, so that the moisture content of the skin is very low when the impedance value of the skin is the critical impedance value. Note that the threshold impedance value is not limited to the average impedance value in the eighth hour, and may be set to any impedance value at which the moisture content of the skin is extremely low.
The display module 3 is electrically connected to the control module 2 for displaying the moisture retention duration.
The communication module 4 is electrically connected to the control module 2 and configured to transmit the information of the moisturizing duration to the outside, and in this embodiment, the communication module 4 is a bluetooth module and can transmit the information of the moisturizing duration to other electronic devices.
The skin detection device implements a skin detection method, which has the following steps.
Step A: the measuring module 1 is used for measuring the impedance of the skin after a preset time value, and generating an impedance measuring signal indicating a current impedance value. The preset time value is related to the time difference from the skin rubbing the maintenance product to the skin measurement by using the measurement module 1, and the time point of the skin rubbing the maintenance product is set as a time zero point. In this embodiment, the predetermined time value is five minutes.
And B: the control module 2 is utilized to receive the impedance measurement signal and obtain an impedance gain according to the current impedance value and the preset time value, wherein the impedance gain is positively correlated with the current impedance value and negatively correlated with the preset time value. The impedance gain is expressed as follows.
Where Gain is the impedance Gain, ΩtnIs the current impedance value, Ω0Is an initial impedance value, i.e. the average impedance value of the skin rubbed with the skin care product, tnMu is a curvature parameter for the predetermined time value, and the initial impedance value, the curvature parameter and a frequency change of the measuring module 1 when measuring the skin are changed, in this embodiment, the frequency is 1000Hz, the initial impedance value is 265.12k Ω, and the curvature parameter is 1.45.
And C: the control module 2 is utilized to generate an impedance function according to the impedance gain and a time function which exponentially changes along with a time parameter, the impedance function standardizes the positive correlation corresponding relationship between a plurality of impedance values and a plurality of time values, if the time values are respectively converted into a plurality of time logarithms with the base number of 10, the time logarithms and the impedance values are in an exponential positive correlation relationship, as shown in fig. 3, the formula of the impedance function is as follows, and therefore, the time value corresponding to any impedance value can be obtained from the impedance function.
Wherein,
for the function of time, t is the time value, ΩEstimationThe impedance value is used.
Step D: the control module 2 is utilized to obtain the time value corresponding to the critical impedance value according to the critical impedance value and the impedance function, so as to serve as a critical time value, that is, the critical time value corresponding to the critical impedance value when the moisture content of the skin is very low can be obtained according to the impedance function, and the critical time value is related to the time difference from the time zero point to the impedance value of the skin to the critical impedance value.
Step E: the control module 2 is utilized to subtract the preset time value from the critical time value to obtain a moisture retention duration. It should be noted that the moisture retention duration may also be defined as the critical time value minus the time zero, and is not limited herein.
Step F: the control module 2 is utilized to generate a prediction result signal carrying the moisture retention duration time, and the prediction result signal is transmitted to the display module 3 and/or the communication module 4, when the display module 3 receives the prediction result signal, the moisture retention duration time is displayed, and when the communication module 4 receives the prediction result signal, the information of the moisture retention duration time is transmitted outwards.
Therefore, after the user wipes any brand of the maintenance product, after the preset time value, the skin detection device is used for measuring the impedance of the skin to generate the current impedance value, and the skin detection device obtains the impedance gain of the maintenance product wiped on the skin according to the current impedance value and the preset time value so as to obtain the impedance function. It should be noted that, the larger the preset time value is, the more accurate the obtained impedance gain is, and the impedance gain can be set by itself in consideration of the balance between convenience and accuracy, which is not limited herein.
In summary, the above-mentioned embodiment calculates the moisturizing duration according to the measured impedance of the skin and the formulas (1) and (2), so that the user can know the moisturizing duration after wiping the skin, and can conveniently select the skin care product suitable for the user, compared with the conventional detection device, thereby achieving the object of the present invention.
Claims (10)
1. A skin detection method is characterized by comprising the following steps: the skin detection method is executed by a skin detection device, the skin detection device stores a critical impedance value, and the skin detection method comprises the following steps:
(A) measuring the impedance of skin after a preset time value and generating an impedance measuring signal indicating a current impedance value;
(B) obtaining an impedance gain according to the current impedance value and the preset time value, wherein the impedance gain is positively correlated with the current impedance value and negatively correlated with the preset time value;
(C) generating an impedance function according to the impedance gain and a time function which exponentially changes along with a time parameter, wherein the impedance function standardizes the positive correlation corresponding relation between a plurality of impedance values and a plurality of time values; and
(D) the time value corresponding to the critical impedance value is obtained according to the critical impedance value and the impedance function and is used as a critical time value.
2. The skin detection method according to claim 1, characterized in that: further comprising:
(E) subtracting the preset time value from the critical time value to obtain a moisturizing duration, wherein the preset time value is related to the time difference from the skin rubbing of a skin care product to the skin measurement, and the critical time value is related to the time difference from the skin rubbing of the skin care product to the impedance value of the skin to the critical impedance value.
3. The skin detection method according to claim 2, characterized in that: further comprising:
(F) and displaying the moisturizing duration and transmitting the information of the moisturizing duration to the outside.
4. The skin detection method according to claim 1, characterized in that: the skin humidity changes along with time, and each impedance value corresponds to a respective relative humidity value, and the impedance value and the relative humidity value are in negative correlation.
5. The skin detection method according to claim 1, characterized in that: in step (B), the impedance gain is expressed by
Where Gain is the impedance Gain, ΩtnIs the current impedance value, Ω0As an initial impedance value, tnMu is a curvature parameter for the predetermined time value, the initial impedance value, the curvature parameter and a frequency change of the skin detecting device when measuring the skin are changed, the frequency is 1000Hz, the initial impedance value is 265.12k Ω, and the curvature parameter is 1.45.
6. The skin detection method according to claim 5, characterized in that: in step (C), the impedance function is formulated as
Wherein,
for the function of time, t is the time value, ΩEstimationThe impedance value is used.
7. A skin detection device is characterized in that: comprises the following steps:
the measuring module measures the impedance of skin after a preset time value and generates an impedance measuring signal indicating a current impedance value; and
a control module, storing a critical impedance value, electrically connected to the measurement module to receive the impedance measurement signal, and obtaining an impedance gain according to the current impedance value and the preset time value, wherein the impedance gain is positively correlated with the current impedance value and negatively correlated with the preset time value, the control module generates an impedance function according to the impedance gain and a time function that exponentially changes along with a time parameter, the impedance function specifies a positive correlation corresponding relationship between a plurality of impedance values and a plurality of time values, and the control module obtains the time value corresponding to the critical impedance value according to the critical impedance value and the impedance function to serve as a critical time value.
8. The skin detection device according to claim 7, characterized in that: the control module subtracts the preset time value from the critical time value to obtain a moisturizing duration, wherein the preset time value is related to a time difference from the skin rubbing of a skin care product to the skin measurement, and the critical time value is related to a time difference from the skin rubbing of the skin care product to the impedance value of the skin to the critical impedance value.
9. The skin detection device according to claim 8, characterized in that: the control module generates a prediction result signal carrying the moisture preservation duration and transmits the prediction result signal to the display module, and the display module receives the prediction result signal and displays the moisture preservation duration.
10. The skin detection device according to claim 8, characterized in that: the control module generates a prediction result signal carrying the moisture retention duration and transmits the prediction result signal to the communication module, and the communication module receives the prediction result signal and transmits the moisture retention duration information to the outside.
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| CN1686048A (en) * | 2005-06-06 | 2005-10-26 | 清华大学 | Skin moisture measuring method |
| CN102551712A (en) * | 2011-06-13 | 2012-07-11 | 广州安德生物科技有限公司 | Non-invasive type urination alarming device based on bioelectrical impedance and monitoring method |
| CN103271739A (en) * | 2013-05-06 | 2013-09-04 | 清华大学 | Method and device for skin moisture measurement |
| CN203290903U (en) * | 2013-06-24 | 2013-11-20 | 闵兴勇 | Skin analysis meter |
| CN103860169A (en) * | 2012-12-13 | 2014-06-18 | 广州大学城健康产业科技园投资管理有限公司 | Human skin moisture content detection device and system |
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| EP1203562A3 (en) * | 2000-10-27 | 2002-07-31 | Tanita Corporation | Method and apparatus for deriving body fat area |
| JP2005253840A (en) * | 2004-03-15 | 2005-09-22 | Tanita Corp | Skin condition estimating device |
| CN101916334B (en) * | 2010-08-16 | 2015-08-12 | 清华大学 | A kind of skin Forecasting Methodology and prognoses system thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1686048A (en) * | 2005-06-06 | 2005-10-26 | 清华大学 | Skin moisture measuring method |
| CN102551712A (en) * | 2011-06-13 | 2012-07-11 | 广州安德生物科技有限公司 | Non-invasive type urination alarming device based on bioelectrical impedance and monitoring method |
| CN103860169A (en) * | 2012-12-13 | 2014-06-18 | 广州大学城健康产业科技园投资管理有限公司 | Human skin moisture content detection device and system |
| CN103271739A (en) * | 2013-05-06 | 2013-09-04 | 清华大学 | Method and device for skin moisture measurement |
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