Skin measurement instrument with moisture detection function, skin measurement system and skin measurement method

Abstract

The application discloses a skin testing instrument with water content detection function, which comprises a conductive transmitting terminal and a receiving terminal, an image acquisition component for acquiring a skin picture and / or a skin image, a water-oil acquisition circuit connected with the receiving terminal and comprising a sampling resistor, and a control circuit connected with the image acquisition component and the water-oil acquisition circuit respectively, wherein after the transmitting terminal and the receiving terminal contact the skin, the control circuit controls the acquisition of a water-oil voltage from the water-oil acquisition circuit according to the definition of the skin picture acquired by the image acquisition component and / or the definition of the skin image acquired by the image acquisition component. The application acquires the water-oil voltage after detecting the definition of the skin picture and / or the skin image, so that the force used for each skin testing is the same, and the accuracy of the water content detection result is not affected by improper use.

Description

Technical Field

[0001] This invention relates to the field of skin testing technology, and in particular to a skin testing instrument, skin testing system and skin testing method with moisture detection function. Background Technology

[0002] Skin analyzers, which use skin analyzers to measure skin moisture, have been widely used and are highly valued in skin care and medical applications.

[0003] Existing technologies generally utilize sensors, electrodes, and other techniques to obtain parameters such as skin capacitance or capacitive reactance, and then use the correlation between capacitance or capacitive reactance and skin moisture to determine the skin's moisture status. Reference document 1, "A Skin Moisture Measurement Method, 200510011875.2," discloses using two metal electrodes without surface insulating layers as measuring probes. The probes are brought into contact with the skin surface to measure the equivalent impedance value of the stratum corneum. A square wave signal with a frequency below 50kHz is provided to the probes. An amplification circuit composed of only one circuit amplification element amplifies the response signal received by the measuring probes. The amplified voltage value is acquired through an AD conversion method, stored in a microcontroller, and the corresponding moisture content value is retrieved according to a table showing the relationship between voltage and moisture content stored in the microcontroller. Reference document 1 ensures that the object measured each time is the stratum corneum, but it cannot guarantee that the user applies the same pressure each time, affecting the test results. Prior art document 2, "A Portable Constant Pressure Skin Moisture Content Detection Device and Detection Method, 202010181881.7," discloses a retractable capacitive detection probe. After the probe contacts the skin, an elastic component is compressed, causing the probe to retract into the housing. Because the elastic component is compressed to the same degree each time, interference from varying user force is eliminated, ensuring consistent pressure on the capacitive electrode during each test and thus guaranteeing accurate moisture detection. However, while prior art document 2 uses an elastic component to ensure consistent pressure for each test, the reliability of this hardware detection method gradually decreases with repeated use. Summary of the Invention

[0004] The main objective of this invention is to provide a skin testing instrument, system, and method with moisture detection function. It overcomes the shortcomings of existing technologies by collecting water, oil, and voltage data only after the skin image and / or skin surface is clear, ensuring that the pressure used in each skin test is the same, avoiding the inaccuracy of moisture detection results due to improper use, and improving the user experience.

[0005] The present invention adopts the following technical solution:

[0006] On the one hand, a skin testing instrument with moisture detection function includes:

[0007] Conductive transmitting and receiving terminals;

[0008] Image acquisition component for acquiring skin images and / or skin details;

[0009] A water and oil collection circuit, connected to the receiving terminal, includes a sampling resistor;

[0010] The control circuit is connected to the image acquisition component and the water-oil acquisition circuit respectively. After both the transmitting terminal and the receiving terminal are in contact with the skin, the control circuit controls the acquisition of water-oil voltage from the water-oil acquisition circuit based on the clarity of the skin image acquired by the image acquisition component and / or based on the clarity of the skin image acquired by the image acquisition component.

[0011] Preferably, the water and oil acquisition circuit further includes a filtering circuit; the filtering circuit is disposed between the receiving terminal and the sampling resistor.

[0012] Preferably, the water and oil acquisition circuit further includes a diode; the diode is disposed between the receiving terminal and the sampling resistor.

[0013] Preferably, the skin analyzer with moisture detection function further includes: a voltage regulator circuit; the voltage regulator circuit is disposed between the control circuit and the transmitting terminal, and is used to convert the square wave excitation signal sent by the control circuit into a stable square wave signal.

[0014] Preferably, the voltage regulator circuit includes a PNP transistor; the base of the PNP transistor is connected to the control circuit; the emitter of the PNP transistor is connected to a DC power supply with a fixed voltage; and the collector of the PNP transistor is connected to the emitter terminal.

[0015] Preferably, the skin analyzer with moisture detection function further includes: a light-emitting component; the control circuit is connected to the light-emitting component to turn on the light source when both the transmitting terminal and the receiving terminal are in contact with the skin, and to turn off the light source when neither the transmitting terminal nor the receiving terminal is in full contact with the skin; after the light source is turned on, the image acquisition component performs skin image acquisition and / or skin image acquisition.

[0016] Preferably, the skin analyzer with moisture detection function further includes: a power supply module; the power supply module is connected to the control circuit to supply power.

[0017] Preferably, the skin analyzer with moisture detection function further includes: a voice prompt module; the voice prompt module is connected to the control circuit to provide voice prompts.

[0018] Preferably, the skin analyzer with moisture detection function further includes: a detection head, a fixed base, and a lower housing arranged in sequence; the transmitting terminal and the receiving terminal are arranged opposite to each other on the detection head; the light-emitting component is disposed in the detection head; the image acquisition component is disposed in the fixed base; and the control circuit is disposed in the lower housing and / or the fixed base.

[0019] Preferably, the skin analyzer with moisture detection function further includes a top cover; the detection head and the fixing base are disposed inside the top cover; the top cover is connected to the lower housing to form an integral whole.

[0020] Secondly, a skin testing system includes the aforementioned skin testing instrument with moisture detection function; it also includes an external terminal device; the external terminal device is connected to the skin testing instrument with moisture detection function to control the skin testing instrument to activate moisture detection, the skin testing instrument sends the collected water-oil voltage to the external terminal device, and the external terminal device converts the collected water-oil voltage into a moisture value.

[0021] Thirdly, a skin testing system includes the aforementioned skin testing instrument with moisture detection function; it also includes an external terminal device and a cloud server; the external terminal device is connected to the skin testing instrument with moisture detection function to control the skin testing instrument to activate moisture detection, and the skin testing instrument sends the collected water-oil voltage to the external terminal device; the skin testing instrument or the external terminal device uploads the water-oil voltage to the cloud server, and the cloud server converts the received water-oil voltage into a moisture value and sends the moisture value to the external terminal device.

[0022] Fourthly, a skin testing method includes:

[0023] S102, detect the received voltage signal, and when the value of the voltage signal reaches a preset value, start acquiring skin images and / or skin pictures;

[0024] S104, determine the clarity of the acquired skin image, and when the clarity reaches a first preset threshold, control the acquisition of the voltage signal and use the voltage signal as the water-oil voltage; and / or, determine the clarity of the captured skin image, and when the clarity reaches a second preset threshold, control the acquisition of the voltage signal and use the voltage signal as the water-oil voltage.

[0025] Preferably, in step S102, when the value of the voltage signal reaches a preset value, the acquisition of skin images and / or skin details is initiated, specifically including:

[0026] When the value of the voltage signal reaches a preset value and remains so for a preset time, the acquisition of skin images and / or skin pictures is initiated.

[0027] Preferably, in step S102, before starting the acquisition of skin images and / or skin details, the method further includes: controlling the activation of a light source.

[0028] Preferably, the skin testing method further includes:

[0029] The collected water and oil voltage is converted into a water content value.

[0030] Preferably, the collected water-oil voltage is converted into a water content value, specifically including:

[0031] The moisture value corresponding to the water-oil voltage is obtained by storing the linear equation of water-oil voltage-moisture value or the relationship table of water-oil voltage-moisture value.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] (1) In this invention, after both the transmitting and receiving terminals are in contact with the skin, the water and oil voltage is not directly collected. Instead, the water and oil voltage is collected only after the skin image and / or skin picture are clear. This ensures that the force used for each skin test is the same, avoids affecting the accuracy of the moisture detection results due to improper use, and improves the user experience.

[0034] (2) The present invention also includes a voltage regulator circuit; the voltage regulator circuit is disposed between the control circuit and the transmitting terminal, and is used to convert the square wave excitation signal sent by the control circuit into a square wave signal with a stable level, so as to ensure that the skin tissue measured each time is the same, and further ensure the accuracy of the moisture detection results.

[0035] (3) The water and oil collection circuit of the present invention is set between the receiving terminal and the control circuit. That is, the control circuit collects the real water and oil voltage that has not been amplified by the AD amplifier circuit. On the one hand, the power consumption is small and the battery life can be increased. On the other hand, it enables the detection of real skin moisture.

[0036] (4) The water and oil acquisition circuit of the present invention also includes a filter circuit and a current anti-reverse circuit, which further improves the stability and accuracy of the detection results.

[0037] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are listed below.

[0038] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0039] Figure 1 Circuit diagram of the voltage regulator circuit in Embodiment 1 of the present invention;

[0040] Figure 2 Circuit diagram of the water and oil collection circuit of Embodiment 1 of the present invention;

[0041] Figure 3 This is a perspective view of the skin testing instrument with moisture detection function according to Embodiment 1 of the present invention;

[0042] Figure 4 This is an exploded view of the skin testing instrument with moisture detection function according to Embodiment 1 of the present invention;

[0043] Figure 5 A cross-sectional view of a skin testing instrument with moisture detection function according to Embodiment 1 of the present invention;

[0044] Figure 6 This is a cross-sectional view of the detection head and fixing base of Embodiment 1 of the present invention;

[0045] Figure 7 This is a schematic diagram of the circuit formed between the contact terminal and the skin in Embodiment 1 of the present invention;

[0046] Figure 8 This is a schematic diagram of the circuit formed by the light source circuit and the main control circuit in Embodiment 1 of the present invention;

[0047] Figure 9 This is a structural block diagram of the skin testing system (a skin testing instrument with moisture detection function interacting with an external terminal device) according to Embodiment 2 of the present invention;

[0048] Figure 10 This is a structural block diagram of the skin testing system (skin testing instrument with moisture detection function, external terminal device, and cloud server interaction) according to Embodiment 3 of the present invention.

[0049] Figure 11 This is a flowchart of the skin testing method according to Embodiment 4 of the present invention;

[0050] Figure 12 This is a flowchart of a local skin measurement method including three light sources according to Embodiment 4 of the present invention, wherein (a) includes sharpness detection before image acquisition, and (b) includes sharpness detection before and after image acquisition.

[0051] Figure 13 This is a flowchart of a full-face skin measurement method including three light sources according to Embodiment 4 of the present invention, wherein (a) includes sharpness detection before image acquisition, and (b) includes sharpness detection before and after image acquisition. Detailed Implementation

[0052] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0053] In the description of this invention, it should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0054] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0055] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0056] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the step identifiers S101, S102, S103, etc. are used only for convenience of description and do not indicate the execution order. The corresponding execution order can be adjusted.

[0057] Example 1

[0058] See Figures 1 to 8 As shown, a skin analyzer 1 with moisture detection function includes:

[0059] Conductive transmitting terminal 10 and receiving terminal 11;

[0060] Image acquisition component 14 is used to acquire skin images and / or skin details;

[0061] The water and oil collection circuit 12 is connected to the receiving terminal 11 and includes a sampling resistor R5;

[0062] The control circuit 13 is connected to the image acquisition component 14 and the water-oil acquisition circuit 12 respectively. After the transmitting terminal 10 and the receiving terminal 11 are in contact with the skin, the control circuit 13 controls the acquisition of water-oil voltage from the water-oil acquisition circuit 12 according to the clarity of the skin image acquired by the image acquisition component 14 and / or according to the clarity of the skin image acquired by the image acquisition component 14.

[0063] Specifically, the control chip (such as a microcontroller or MCU) of the control circuit is connected to the transmitting terminal 10 and the receiving terminal 11 respectively. After the skin analyzer 1 with moisture detection function is powered on, the control chip sends a continuous square wave signal (such as a 2.6KHz PWM signal) below 50KHz through an output port to the conductive transmitting terminal 10. After receiving the square wave signal, the transmitting terminal 10 sends a signal to the outside. When not in contact with the skin, the receiving terminal 11 receives the signal sent by the transmitting terminal 10 through the air (i.e., forming a loop with the air) and outputs a signal to the control chip after passing through the water and oil collection circuit 12. Since air is non-conductive in most cases (occasionally with very weak conductivity), the electrical signal received by the control chip is 0 or a small value. After contact with the skin, the receiving terminal 11 receives the signal sent by the transmitting terminal 10 (i.e., forming a loop with the human skin, see Figure 7 (As shown) The water-oil acquisition circuit 12 outputs a signal to the control chip. Because skin is conductive, the control chip can acquire a large, sudden change in electrical signal value after contact with the skin. In this embodiment, the electrical signal can be a voltage signal. When the control chip detects that the voltage signal is greater than a preset voltage value, it determines that the transmitting terminal 10 and the receiving terminal 11 have contacted the skin. Furthermore, based on the clarity of the skin image acquired by the image acquisition component 14 (clarity is determined before taking the picture) and / or based on the clarity of the skin image acquired by the image acquisition component (clarity is determined after taking the picture), it controls the acquisition of water-oil voltage from the water-oil acquisition circuit, and uses the acquired voltage signal as the water-oil voltage. Within the control chip, the moisture value corresponding to the detected water-oil voltage can be obtained through a stored linear equation of water-oil voltage-moisture value or a water-oil voltage-moisture value storage table.

[0064] This invention does not directly collect water and oil voltage after both the transmitting and receiving terminals are in contact with the skin. Instead, it collects water and oil voltage only after the skin image and / or skin picture is clear. This means that the focal length of the image acquisition module can remain stable, ensuring that the force used for each skin measurement is the same. This avoids affecting the accuracy of the moisture detection results due to improper use and improves the user experience.

[0065] In this embodiment, see Figure 3 As shown, the water and oil acquisition circuit 12 further includes a filtering circuit; the filtering circuit is disposed between the receiving terminal 11 and the sampling resistor R5.

[0066] Specifically, the filtering circuit can be an RC circuit, specifically including capacitor C1 and resistor R4 as shown in the figure. The capacitor C1 is connected to the receiving terminal 11, which can filter out interference noise introduced by the input terminal, eliminate the adverse effects caused by jitter caused by the operation of the external input point, and play the role of smoothing the voltage.

[0067] Furthermore, the water and oil acquisition circuit 12 also includes a diode Q2 to prevent reverse current flow; the diode Q2 is disposed between the receiving terminal 11 and the sampling resistor R5.

[0068] In this embodiment, the skin analyzer with moisture detection function further includes a voltage regulator circuit 15; the voltage regulator circuit 15 is disposed between the control circuit 13 and the transmitting terminal 10, and is used to convert the square wave excitation signal sent by the control circuit into a stable square wave signal.

[0069] Specifically, in this embodiment, see Figure 2 As shown, the voltage regulator circuit 15 includes a PNP transistor Q1; the base of the PNP transistor Q1 is connected to the control circuit 13; the emitter of the PNP transistor Q1 is connected to a DC power supply with a fixed voltage of 3.3V; and the collector of the PNP transistor Q1 is connected to the emitter terminal 10.

[0070] Specifically, as the skin analyzer is used, its battery voltage will change. Therefore, the high-level voltage value of the PWM signal output by the control circuit 13 will vary. Without processing, this can lead to inconsistent detected skin tissue, ultimately resulting in inaccurate subsequent water-oil voltage detection. Therefore, in this embodiment, the voltage regulator circuit 15 introduces a PNP transistor Q1, connecting its emitter to a fixed 3.3V DC power supply. This ensures that the high-level signal of the square wave excitation signal emitted from the transmitting terminal 10 is stable, guaranteeing the accuracy of subsequent water-oil voltage detection.

[0071] In this embodiment, the skin analyzer with moisture detection function further includes: a light-emitting component 16; the control circuit 13 is connected to the light-emitting component 16 to turn on the light source when both the transmitting terminal 10 and the receiving terminal 11 are in contact with the skin, and to turn off the light source when the transmitting terminal 10 and the receiving terminal 11 are not in full contact with the skin; after the light source is turned on, the image acquisition component performs skin image acquisition and / or skin image acquisition.

[0072] The light source is turned on only after the skin analyzer 1 with moisture detection function comes into contact with the skin to keep the detection area sealed. This ensures that the light source emitted by the skin analyzer 1 with moisture detection function is not affected by ambient light, thus ensuring that the light source intensity is consistent each time and improving the accuracy of the detection. On the other hand, it can avoid glare from the detection light source and damage to the eyes (the instrument is close to the eyes when detecting the face) and save power. Clarity detection is performed before and / or after image acquisition to ensure that the acquired image is clear, thereby improving the accuracy of the detection results.

[0073] In this embodiment, the light source emitted by the light-emitting component 16 includes at least one of natural light, UV light, or polarized light. The control circuit, connected to the light-emitting component 16, is also used to control the switching between natural light, UV light, and polarized light. The control circuit controls the natural light, UV light, or polarized light to turn on and off sequentially or randomly according to a preset. In one embodiment, after detecting that the transmitting terminal 10 and the receiving terminal 11 are in contact with the skin, the natural light can be turned on first. After acquiring a skin image under natural light, the system automatically switches to acquiring a skin image under UV light, and finally automatically switches to acquiring a skin image under polarized light. After all images under the three light sources have been acquired, the light source is turned off. It should be noted that the order in which the three light sources are triggered can be set according to specific needs, and this embodiment does not impose any restrictions. Of course, depending on the detection needs, only one or two of the three light sources can be turned on, that is, only skin images under one or two light sources need to be acquired.

[0074] Different light sources have different wavelengths, allowing them to penetrate to different depths of the skin and capture different spectral images. For example, natural light can emit soft, diffused light from all directions, providing a comprehensive assessment of facial skin condition; polarized light can reduce direct reflected light, allowing observation of uneven skin tone and sensitivity (redness) beneath the epidermis; and UV light can penetrate the skin's surface to the epidermis, capturing images of blocked hair follicles (porphyrins).

[0075] See Figure 4 As shown, the light-emitting component 16 includes: an LED bead 161 and a polarizer 160; the LED bead 161 is used to emit natural light or UV light; the polarizer 160 is disposed in front of the LED bead 161 and is used to convert the light emitted by the LED bead 161 into polarized light. For details, see [link to documentation]. Figure 2As shown, the polarizer 160 includes a polarizer 161 and an analyzer 1602.

[0076] See Figure 6 As shown, the control circuit 13 includes a light source circuit 131 and a main control circuit 132; the transmitting terminal 10 and the receiving terminal 1110 are respectively connected to the light source circuit 131 to form a closed loop; the light source circuit 131 is connected to the main control circuit 132 to send the signal output from the contact terminal and receive the signal returned by the main control circuit 132 to control the light-emitting component 16 to turn the light source on or off; the main control circuit 132 is connected to the image acquisition component 12 to control image acquisition.

[0077] For details, see Figure 2 As shown, the transmitting terminal 10 and receiving terminal 11 are disposed on the detection head 19; the light-emitting component 16 and the light source circuit 131 are both disposed inside the detection head 19. Therefore, the transmitting terminal 10 and receiving terminal 11 are close to the light source circuit 131, which makes the loop wiring more convenient and improves the accuracy of the loop. The light source circuit 131 is connected to the main control circuit 132 through the light source interface 1322 to form a loop, and the image acquisition module is connected to the main control circuit 132 through the camera interface 1321 to form a loop.

[0078] It should be noted that the light source circuit 131 and the main control circuit 132 can also be implemented by a single circuit (integrated on a circuit board), depending on the specific needs. This embodiment does not impose any restrictions.

[0079] In this embodiment, the control circuit includes a communication module 1323; the communication module is used to connect to an external terminal device. Specifically, the communication module can be a wireless communication module, such as a WIFI module / Bluetooth module, etc.

[0080] In this embodiment, the skin analyzer 1 with moisture detection function further includes a power supply module 17; the power supply module 17 is connected to the control circuit to supply power. The power supply module may include a rechargeable lithium battery, which is convenient to use.

[0081] In this embodiment, the skin analyzer 1 with moisture detection function further includes a switch module 18; the switch module 18 is connected to the control circuit to turn on the skin analyzer 1 with moisture detection function. Specifically, the switch module 18 is disposed on the housing of the skin analyzer 1 with moisture detection function, and includes a button switch or a touch switch. Pressing the button switch or touching the touch switch will turn on the skin analyzer 1 with moisture detection function.

[0082] In this embodiment, the skin analyzer 1 with moisture detection function further includes: a voice prompt module; the voice prompt module is connected to the control circuit to provide voice prompts. Specifically, it can prompt the user to press the device firmly against the skin when the transmitting terminal 10 and the receiving terminal 11 are not fully in contact with the skin; it can prompt the user to complete the data collection after both the transmitting terminal 10 and the receiving terminal 11 have contacted the skin and the water-oil voltage has been collected; it can prompt the user to complete the moisture value detection after the moisture value has been calculated; it can prompt the user to turn on the light to collect images after both the transmitting terminal 10 and the receiving terminal 11 have contacted the skin; it can prompt the user to adjust the position or pressure when the image before or after data collection is unclear; it can prompt the user to remove the device from the skin or move to the next detection point after all images have been collected (the specific detection point can be indicated, such as the forehead, cheek, nose, or chin); during the data collection process, it can also provide corresponding prompts if the transmitting terminal 10 and the receiving terminal 11 are not fully in contact with the skin. Specifically, how to provide prompts and in what scenarios to provide prompts can be set as needed.

[0083] In this embodiment, the skin analyzer 1 with moisture detection function further includes: a detection head 19, a fixing base 20, and a lower housing 21 arranged sequentially; the transmitting terminal 10 and the receiving terminal 1110 are arranged opposite to each other on the detection head 19; the light-emitting component 11 is disposed inside the detection head 19; the image acquisition component 12 is disposed inside the fixing base 20; and the control circuit is disposed inside the lower housing 21 and / or the fixing base 20.

[0084] Specifically, the end of the detection head 19 is provided with two openings 142 for accommodating the two contact terminals. When the transmitting terminal 10 and the receiving terminal 1110 are arranged opposite each other on the end face of the detection head 19, so that the entire end face of the detection head 19 is in close contact with the skin, both contact terminals can contact the skin, making the contact detection more accurate.

[0085] Specifically, the transmitting terminal 10 and the receiving terminal 1110 can be plastic electroplated parts or metal parts, as long as they can conduct electricity. In order to make the skin tester 1 with moisture detection function lighter, the transmitting terminal 10 and the receiving terminal 1110 in this embodiment are plastic electroplated parts.

[0086] The detection head 19 is also provided with a detection port. The light source emitted by the light-emitting component 16 can shine through the detection port 191 onto the skin. Correspondingly, the image acquisition component 15 can detect the skin image (before taking the picture) or the skin image (after taking the picture) through the detection port. The detection port can be empty or can be blocked by a transparent plastic material, as long as the light source is not filtered out.

[0087] When the control circuit 13 includes the light source circuit 131 and the main control circuit 132 as described above, the light source circuit 131 is disposed in the fixed base 20, and the main control circuit 132 is disposed in the lower housing 21.

[0088] In this embodiment, the skin testing instrument 1 with moisture detection function further includes a top cover 22; the detection head 19 and the fixing base 20 are disposed inside the top cover 22; the top cover 22 is connected to the lower housing 21 to form a whole. The top cover 22 is used to prevent dust from entering the interior of the detection head 19 and to protect the skin testing instrument 1 with moisture detection function. When in use, the top cover 22 can be removed for testing.

[0089] Example 2

[0090] See Figure 9 As shown, this embodiment of a skin testing system includes a skin testing instrument 1 with moisture detection function as described in Embodiment 1; it also includes an external terminal device 3; the external terminal device 3 is connected to the skin testing instrument 1 with moisture detection function to control the skin testing instrument 1 to start moisture detection, the skin testing instrument 1 sends the collected water and oil voltage to the external terminal device 3, and the external terminal device 3 converts the collected water and oil voltage into a moisture value.

[0091] In this embodiment, the skin testing instrument 1 is only responsible for collecting water-oil voltage; the conversion of water-oil voltage into moisture value is performed on the external terminal 3. Specifically, the moisture value corresponding to the detected water-oil voltage can be obtained through a stored linear equation of water-oil voltage-moisture value or a water-oil voltage-moisture value storage table.

[0092] It should be noted that, in other embodiments, the moisture value corresponding to the detected water-oil voltage can also be obtained on the skin analyzer 1 by using a stored linear equation of water-oil voltage-moisture value or a storage table of water-oil voltage-moisture value.

[0093] In addition, the external terminal device 3, when connected to the skin analyzer 1 with moisture detection function, can control the skin analyzer 1 with moisture detection function to start skin analysis according to the set instructions. The skin analyzer 1 with moisture detection function sends the collected images to the external terminal device 3, and the external terminal device 3 processes the collected images to obtain skin data.

[0094] In this embodiment, the external terminal device 3 includes a mobile phone, iPad, computer, or beauty instrument, etc. The mobile phone, iPad, computer, or beauty instrument is equipped with a corresponding APP. The user sends a detection command to the skin analyzer 1 with moisture detection function through the APP. At the same time, the skin analyzer 1 with moisture detection function collects water and oil values ​​and / or images and sends them to the APP of the external terminal device 3. The APP displays the images and provides information prompts, and displays the calculated moisture value and / or skin data.

[0095] Specifically, the external terminal device 3 communicates with the skin analyzer 1 with moisture detection function through a communication module.

[0096] For wireless communication, after the skin analyzer 1 with moisture detection function is powered on, it connects to the external terminal device 3 by searching for devices on the network. Then, user registration is performed through the APP on the external terminal device 3. After registration (or temporary user registration), detection commands can be issued through the APP, including moisture detection, full face detection, and local detection. Full face detection can include forehead detection, cheek detection, nose detection, and chin detection. After the skin analyzer 1 with moisture detection function has collected images of each area, it will move to another designated location with a voice prompt or text message prompt until all areas have been collected. For local detection, a specific area of ​​the face can be specified for detection.

[0097] It should be noted that the skin testing instrument 1 with moisture detection function of the present invention can also collect the detection of skin on other parts of the body besides the face.

[0098] Example 3

[0099] See Figure 10 As shown in the figure, this embodiment of a skin testing system includes a skin testing instrument 1 with moisture detection function as described in Embodiment 1; it also includes an external terminal device 3 and a cloud server 5; the external terminal device 3 is connected to the skin testing instrument 1 with moisture detection function to control the skin testing instrument 1 to start moisture detection, the skin testing instrument 1 sends the collected water and oil voltage to the external terminal device 3; the skin testing instrument 1 or the external terminal device 3 uploads the water and oil voltage to the cloud server 5, the cloud server 5 converts the received water and oil voltage into a moisture value, and sends the moisture value to the external terminal device 3.

[0100] In this embodiment, the external terminal device 3 includes a mobile phone, iPad, computer, or beauty instrument, etc. The mobile phone, iPad, computer, or beauty instrument is equipped with a corresponding APP. The user sends a detection command to the skin analyzer 1 with moisture detection function through the APP. At the same time, the water and oil value and / or image collected by the skin analyzer 1 with moisture detection function are sent to the APP of the external terminal device 3. The APP displays the image and provides information prompts. Meanwhile, the cloud server 5 displays the moisture value and / or skin data obtained after processing the collected image.

[0101] Specifically, the external terminal device 3 and the cloud server 5 communicate with the skin analyzer 1 with moisture detection function through a communication module.

[0102] For wireless communication, after the skin analyzer 1 with moisture detection function is powered on, it connects to the external terminal device 3 by searching for devices on the network. Then, user registration is performed through the APP on the external terminal device 3. After registration (or temporary user registration), detection commands can be issued through the APP, including moisture detection, full face detection, and local detection. Full face detection can include forehead detection, cheek detection, nose detection, and chin detection. After the skin analyzer 1 with moisture detection function has collected images of each area, it will move to another designated location with a voice prompt or text message prompt until all areas have been collected. For local detection, a specific area of ​​the face can be specified for detection.

[0103] It should be noted that the skin testing instrument 1 with moisture detection function of the present invention can also collect the detection of skin on other parts of the body besides the face.

[0104] Example 4

[0105] See Figure 11 As shown, this embodiment of a skin testing method includes:

[0106] S102, detect the received voltage signal, and when the value of the voltage signal reaches a preset value, start acquiring skin images and / or skin pictures;

[0107] S104, determine the clarity of the acquired skin image, and when the clarity reaches a first preset threshold, control the acquisition of the voltage signal and use the voltage signal as the water-oil voltage; and / or, determine the clarity of the captured skin image, and when the clarity reaches a second preset threshold, control the acquisition of the voltage signal and use the voltage signal as the water-oil voltage.

[0108] The execution body of the skin testing method is the control chip (such as a microcontroller or MCU) of the control circuit. Specifically, the control chip (such as a microcontroller or MCU) of the control circuit is connected to the transmitting terminal 10 and the receiving terminal 11 respectively. After the skin tester 1 with moisture detection function is powered on, the control chip sends a continuous square wave signal (such as a 2.6KHz PWM signal) below 50KHz through an output port to the conductive transmitting terminal 10. After receiving the square wave signal, the transmitting terminal 10 sends a signal to the outside. When not in contact with the skin, the receiving terminal 11 receives the signal sent by the transmitting terminal 10 through the air (i.e., forms a loop with the air) and outputs a signal to the control chip after passing through the water and oil collection circuit 12. Since air is non-conductive in most cases (occasionally it has very weak conductivity), the electrical signal received by the control chip is 0 or a small value. After contact with the skin, the receiving terminal 11 receives the signal sent by the transmitting terminal 10 (i.e., forms a loop with the human skin, see Figure 7 (As shown) The water-oil acquisition circuit 12 outputs a signal to the control chip. Since skin is conductive, the control chip can acquire a large, sudden change in electrical signal value after contact with the skin. In this embodiment, the electrical signal can be a voltage signal. When the control chip detects that the voltage signal is greater than a preset voltage value, it determines that the transmitting terminal 10 and the receiving terminal 11 have contacted the skin. Furthermore, based on the clarity of the skin image acquired by the image acquisition component 14 (judging cleanliness before taking a picture, if it is greater than a first preset threshold) and / or based on the clarity of the skin image acquired by the image acquisition component (judging clarity after taking a picture, if it is greater than a second preset threshold), it controls the acquisition of water-oil voltage from the water-oil acquisition circuit, using the acquired voltage signal as the water-oil voltage. Within the control chip, the moisture value corresponding to the detected water-oil voltage can be obtained through a stored linear equation of water-oil voltage-moisture value or a water-oil voltage-moisture value storage table.

[0109] In this embodiment, step S102, when the value of the voltage signal reaches a preset value, initiates the acquisition of skin images and / or skin details, specifically including:

[0110] When the value of the voltage signal reaches a preset value and remains so for a preset time, the acquisition of skin images and / or skin pictures is initiated.

[0111] In step S102, before starting the acquisition of skin images and / or skin details, the method further includes: controlling the activation of the light source.

[0112] The skin testing method further includes:

[0113] The collected water and oil voltage is converted into a water content value.

[0114] The collected water-oil voltage is converted into a water content value, specifically including:

[0115] The moisture value corresponding to the water-oil voltage is obtained by storing the linear equation of water-oil voltage-moisture value or the relationship table of water-oil voltage-moisture value.

[0116] In this embodiment, the relationship between water-oil voltage and water content is shown in Table 1 below.

[0117] Table 1

[0118]

[0119]

[0120]

[0121] Correspondingly, the linear equation for water-oil voltage-moisture content can be expressed as y = 0.92x + 16.54, where y represents the moisture content and x represents the water-oil voltage. Alternatively, the linear equation can be expressed as y1 = 0.23x + 4.135, where y1 represents the water content and x represents the water-oil voltage. The above are only the fitted linear equations; the specific parameters of the linear equations can vary within a certain range depending on the fitting method and the fitted data. This embodiment does not impose any limitations.

[0122] In this embodiment, an image sharpness algorithm model is used to obtain the sharpness of the image or captured image, and a sharpness conversion function is used to obtain the sharpness probability of the image or captured image.

[0123] Specifically, the image sharpness algorithm model can be a convolutional neural network model. Specifically, it involves initially collecting a large number of image samples with varying degrees of sharpness to train the model, then using the trained convolutional neural network model to judge the sharpness of the collected images and outputting the results. Finally, a sharpness conversion function is used to numerically convert the output of the convolutional neural network model to obtain the sharpness probability.

[0124] In one embodiment, the following sharpness conversion function is used to convert the binary classification results of the convolutional neural network model. If the classification results output by the convolutional neural network model are -0.11 and 3, the blur probability converted by the following formula is 47%, and the sharpness probability is 95%. Since the sharpness probability is greater than the blur probability, the final result is determined to be sharp.

[0125]

[0126] In another embodiment, the three-class classification results of the convolutional neural network model are converted using the following sharpness conversion function. For example, if 0.85 is considered sharp, the convolutional neural network model classifies it as sharp; if 0.1 is considered sharp, it is classified as moderately sharp; and if 0.05 is considered sharp, it is classified as blurry. Then, the sharpness conversion function is used to convert the results into sharpness probabilities, as follows:

[0127]

[0128]

[0129] It should be noted that in other embodiments, the decision to take a picture can also be directly controlled based on the output of the convolutional neural network model.

[0130] In addition, any existing resolution calculation method can be used to calculate the resolution of a picture or image.

[0131] In this embodiment, the skin measurement method can also acquire skin images and obtain skin data based on the acquired skin images, specifically including:

[0132] S202, detect the received voltage signal, and when the value of the voltage signal reaches a preset value, control the activation of one of the light sources in the preset light source set;

[0133] S204, start capturing skin images and detect the image clarity before taking a picture. When the image is detected to be clear, control the camera to capture the image.

[0134] S206, determine whether the image acquisition of all light sources in the preset light source set is complete. If complete, turn off the light source; if not complete, turn on one of the non-turned light sources and repeat steps 204 to 206.

[0135] The preset light source set includes at least one of natural light, UV light, and polarized light. Specifically, it can be controlled to collect skin images under only one light source or under multiple light sources, as needed.

[0136] See Figure 12 and Figure 13 As shown, in step S202, when the value of the electrical signal reaches a preset value, one of the light sources in a preset light source set is controlled to be turned on, specifically including:

[0137] When the value of the electrical signal reaches a preset value and remains so for a preset time, one of the light sources in the preset light source set is turned on.

[0138] During use, users may accidentally touch the device. To prevent this from triggering the detection, it is necessary to determine the contact time between the transmitting and receiving terminals.

[0139] In this embodiment, 2104 further includes:

[0140] When the image is detected to be unclear, a voice prompt will guide you to adjust the position and / or the pressure applied.

[0141] In this embodiment, after S204, the method further includes:

[0142] S205, determine the clarity of the acquired image. If it is clear, proceed to S206; otherwise, a voice prompt will prompt you to re-acquire the image. After restarting the corresponding light source, repeat steps 204 to 206.

[0143] S204 further includes: determining the sharpness type based on the sharpness probability of the image or captured image, wherein the sharpness type includes sharp, moderately sharp, or blurry; if sharp, controlling the camera to take a picture; if moderately sharp, determining whether a preset button is pressed; if pressed, forcing the camera to take a picture, otherwise providing a voice prompt; if blurry, providing a voice prompt. By judging the sharpness probability, it is possible to determine whether the image or captured image is sharp, moderately sharp, or blurry. In this embodiment, a sharpness probability of 0.9 or higher is considered sharp, a sharpness probability of 0.7-0.9 is considered moderately sharp, and a sharpness probability of less than 0.7 is considered blurry. Specific thresholds can be set as needed.

[0144] In this embodiment, if the detection mode is set to full-face detection on the APP of the external terminal device, then after S206, the following is also included:

[0145] S208, prompts the next skin detection point, and repeats steps 202-206.

[0146] This invention can automatically switch light sources, automatically turn light sources on / off, provide voice prompts indicating that water, oil, and voltage data collection is complete, provide voice prompts indicating that the image or picture is unclear, and provide voice prompts indicating that the skin analyzer is removed from the skin. It achieves automatic control and interaction, thus improving the user experience.

[0147] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A skin analyzer with moisture detection function, characterized in that, include: Conductive transmitting and receiving terminals; Image acquisition component for acquiring skin images and / or skin details; A water and oil collection circuit, connected to the receiving terminal, includes a sampling resistor; The control circuit is connected to the image acquisition component and the water-oil acquisition circuit respectively. After both the transmitting terminal and the receiving terminal are in contact with the skin, the acquisition of skin image and / or skin picture is started. When the clarity of the skin image reaches a first preset threshold and / or the clarity of the skin picture reaches a second preset threshold, the control circuit is used to acquire water-oil voltage from the water-oil acquisition circuit.

2. The skin analyzer with moisture detection function according to claim 1, characterized in that, The water and oil acquisition circuit further includes a filter circuit; the filter circuit is disposed between the receiving terminal and the sampling resistor.

3. The skin analyzer with moisture detection function according to claim 1, characterized in that, The water and oil acquisition circuit further includes a diode; the diode is disposed between the receiving terminal and the sampling resistor.

4. The skin analyzer with moisture detection function according to claim 1, characterized in that, Also includes: A voltage regulator circuit is disposed between the control circuit and the transmitting terminal, and is used to convert the square wave excitation signal sent by the control circuit into a stable square wave signal.

5. The skin analyzer with moisture detection function according to claim 4, characterized in that, The voltage regulator circuit includes a PNP transistor; the base of the PNP transistor is connected to the control circuit; the emitter of the PNP transistor is connected to a DC power supply with a fixed voltage; and the collector of the PNP transistor is connected to the emitter terminal.

6. The skin analyzer with moisture detection function according to claim 1, characterized in that, It also includes: a light-emitting component; the control circuit is connected to the light-emitting component to turn on the light source when both the transmitting terminal and the receiving terminal are in contact with the skin, and to turn off the light source when neither the transmitting terminal nor the receiving terminal is in full contact with the skin; after the light source is turned on, the image acquisition component performs skin image acquisition and / or skin image acquisition.

7. The skin analyzer with moisture detection function according to claim 1, characterized in that, Also includes: Power supply module; The power supply module is connected to the control circuit to provide power.

8. The skin analyzer with moisture detection function according to claim 1, characterized in that, Also includes: Sound prompt module; The sound prompt module is connected to the control circuit to provide voice prompts.

9. The skin analyzer with moisture detection function according to claim 6, characterized in that, Also includes: The detection head, the mounting base, and the lower housing are arranged sequentially; the transmitting terminal and the receiving terminal are arranged opposite to each other on the detection head. The light-emitting component is disposed inside the detection head; The image acquisition component is housed within the fixed base; the control circuit is housed within the lower housing and / or the fixed base.

10. The skin analyzer with moisture detection function according to claim 9, characterized in that, It also includes a top cover; the detection head and the fixing seat are disposed inside the top cover; the top cover is connected to the lower housing to form a whole.

11. A skin testing system, characterized in that, The invention includes a skin analyzer with moisture detection function as described in any one of claims 1 to 10; it also includes an external terminal device; the external terminal device is connected to the skin analyzer with moisture detection function to control the skin analyzer to start moisture detection, the skin analyzer sends the collected water and oil voltage to the external terminal device, and the external terminal device converts the collected water and oil voltage into a moisture value.

12. A skin testing system, characterized in that, The device includes a skin analyzer with moisture detection function as described in any one of claims 1 to 10; it also includes an external terminal device and a cloud server; the external terminal device is connected to the skin analyzer with moisture detection function to control the skin analyzer to start moisture detection, and the skin analyzer sends the collected water-oil voltage to the external terminal device; the skin analyzer or the external terminal device uploads the water-oil voltage to the cloud server, and the cloud server converts the received water-oil voltage into a moisture value and sends the moisture value to the external terminal device.

13. A skin testing method, characterized in that, The control circuit described in any one of claims 1 to 10 includes: S102, detect the voltage signal output by the received water and oil acquisition circuit, and when the value of the voltage signal reaches a preset value, start acquiring skin images and / or skin pictures; S104, determine the clarity of the acquired skin image, and when the clarity reaches a first preset threshold, control the acquisition of the voltage signal and use the voltage signal as the water-oil voltage; and / or, determine the clarity of the captured skin image, and when the clarity reaches a second preset threshold, control the acquisition of the voltage signal and use the voltage signal as the water-oil voltage.

14. The skin testing method according to claim 13, characterized in that, In step S102, when the value of the voltage signal reaches a preset value, the acquisition of skin images and / or skin details is initiated, specifically including: When the value of the voltage signal reaches a preset value and remains so for a preset time, the acquisition of skin images and / or skin pictures is initiated.

15. The skin testing method according to claim 13, characterized in that, In step S102, before starting the acquisition of skin images and / or skin details, the method further includes: controlling the activation of the light source.

16. The skin testing method according to claim 13, characterized in that, Also includes: The collected water and oil voltage is converted into a water content value.

17. The skin testing method according to claim 16, characterized in that, The collected water-oil voltage is converted into a water content value, specifically including: The moisture value corresponding to the water-oil voltage is obtained by storing the linear equation of water-oil voltage-moisture value or the relationship table of water-oil voltage-moisture value.

Images