Eye physiotherapy device combining heating and electrical stimulation

Abstract

The invention provides an eye physical therapy device combining heating and electrical stimulation, and belongs to the technical field of electrical stimulation physical therapy equipment, the eye physical therapy device comprises a body and a head band, the two sides of the body are fixedly connected with the two ends of the head band respectively, the body is arranged around the area of two eyes, and the body is provided with a cavity in front of the two eyes; the image acquisition unit is arranged on one side, far away from the eyes of the user, in the cavity and is used for acquiring a face image after the user wears the physiotherapy device and acquiring the pupil distance, the iris diameter and the dryness degree of the face skin of the user; the main control unit identifies the identity of the user according to the pupil distance and the iris diameter of the user in the face image of the user; the output unit is arranged in the cavity, is positioned between the eyes of the user and the image acquisition unit, and is used for receiving an output signal of the main control unit and carrying out heating and micro-current stimulation on the eyes of the user; the water replenishing unit is used for replenishing water according to the skin dryness degree of the user; the display unit is used for displaying output; the power supply unit is used for providing a rechargeable power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of physiotherapy equipment, and in particular to an eye physiotherapy device combining heating and electrical stimulation. Background Art

[0002] Most of the existing eye therapy devices use heating stimulation, vibration stimulation or kneading stimulation to stimulate the skin or tissues around the eyes to relieve eye fatigue and improve dry eyes. However, these stimulation methods are limited to the surface skin and have very limited effects on improving eye muscle tension or eye nerve fatigue.

[0003] There are already micro-current stimulation eye massage devices on the market. By setting electrodes on the massage head or the skin contact part, micro-current stimulation is input to the electrodes. The micro-current will stimulate the nerves and muscles around the eyes, promote muscle contraction and nerve conduction, enhance the vitality of the eye muscles, and also have a certain improvement on some eye problems caused by decreased nerve function. However, this type of eye massage device is purely manual. When wearing the eye therapy device, the function needs to be reset, and personal preferences cannot be remembered. It is very inconvenient to operate the eye therapy device while wearing it.

[0004] Therefore, it is very necessary to develop an eye therapy device that combines heating and electrical stimulation, which can identify the wearer's eye features when worn and record and save them, and replenish moisture in time according to the dryness of the user's eye skin, so as to perform targeted microcurrent stimulation of the eyes, without the user having to frequently remove the device for adjustment and setting. Summary of the invention

[0005] In view of this, the present invention proposes an eye therapy device that combines heating and electrical stimulation, which can quickly identify the physiological characteristics of the wearer's eyes, know whether the current user has used therapy equipment and preferences, and adaptively replenish water based on the user's physiological characteristics and the current season, thereby improving the stimulation effect of the nerves and muscles around the eyes.

[0006] The technical solution of the present invention is implemented as follows: The present invention provides an eye physiotherapy device combining heating and electrical stimulation, comprising a body and a headband, wherein both sides of the body are fixedly connected to both ends of the headband respectively, the body is arranged around the eye area, and the body has a cavity in front of the eyes; and further comprising:

[0007] An image acquisition unit is arranged on a side of the cavity away from the user's eyes, and is used to obtain a facial image of the user after wearing the physiotherapy device, and obtain the user's pupil distance, iris diameter, and dryness of the facial skin;

[0008] A main control unit is arranged inside the main body and is connected to the output terminal signal of the image acquisition unit, and is used to identify the user's identity according to the user's pupil distance and iris diameter in the user's facial image;

[0009] The output unit is arranged in the cavity and located between the user's eyes and the image acquisition unit, and is electrically connected to the main control unit, and is used to receive the output signal of the main control unit to perform heating and frequency-modulated micro-current stimulation on the user's eyes;

[0010] The water replenishment unit is electrically connected to the main control unit to provide hot and humid steam to relieve visual fatigue and humidify according to the dryness of the user's skin to improve the effect of micro-current stimulation;

[0011] A display unit, electrically connected to the main control unit, for display output;

[0012] The power supply unit is arranged inside the main body and is electrically connected to the image acquisition unit, the main control unit, the output unit, the water replenishment unit and the display unit respectively.

[0013] On the basis of the above technical solution, preferably, the image acquisition unit includes an infrared camera and an image processing module; the infrared camera is communicatively connected to the image processing module; the infrared machine obtains a grayscale image of the user's eye and sends the infrared image to the image processing module; the image processing module calculates the user's pupil distance and iris diameter through a built-in image processing algorithm on the one hand, and on the other hand, the image processing module evaluates the dryness of the user's facial skin based on a built-in skin resistance value correction model.

[0014] Preferably, the image processing algorithm includes the following:

[0015] Preprocessing the acquired grayscale image of the user's eye, specifically sampling Gaussian blur denoising and histogram equalization to enhance contrast;

[0016] Perform edge detection on the preprocessed grayscale image and use the edge detection algorithm CANNY to highlight the eyelid contour;

[0017] Set the gradient threshold, extract the eyelid area of ​​both eyes from the eyelid contour, and delete the image of the non-eyelid area;

[0018] The iris diameter and pupil distance of both eyes are obtained within the retained eyelid image, and the user's identity is identified.

[0019] Further preferably, the iris diameter of both eyes is obtained within the eyelid range by separating the white of the eye, the iris and the pupil regions from each other by grayscale threshold segmentation within the eyelid region, setting a first grayscale threshold of the pupil [0, 50] and a second grayscale threshold of the iris (50, 200], respectively extracting the pupil and iris regions, and obtaining the circumscribed circles of the pupil and iris regions by circular fitting; and fitting the circles again on the circumscribed circles of the iris regions to fit the centers of the iris regions:

[0020] A1) on the circumscribed circle of the iris region, three different boundary points are randomly selected each time as the center of the circle and three groups of fitting circles are drawn according to the radius of the circular boundary of the current iris region, wherein the three groups of fitting circles do not overlap with each other and the spacings between them are not completely equal;

[0021] A2) recording the closest points of the three groups of fitted circles drawn each time inside the iris area and connecting them in sequence to form a triangle;

[0022] A3) repeatedly drawing three groups of virtual circles and again forming a triangle based on the closest points of the three groups of fitted circles inside the iris area; so that the number of times the three groups of virtual circles are drawn is an odd number of times not less than 5;

[0023] A4) performing Boolean operation on the triangles obtained by connecting the nearest points of the three groups of virtual circles drawn multiple times inside the iris area to obtain the overlap area, and arbitrarily connecting two non-adjacent endpoints in the overlap area to obtain a first line segment and a second line segment that intersect each other, wherein the length L1 of the first line segment is greater than the length L2 of the second line segment, and if the length L1 of the first line segment is ≤ 3 times the length L2 of the second line segment, then using the first line segment as the major axis, an ellipse inscribed in the overlap area is drawn, the center of the ellipse with the smallest area is taken as the corrected center of the iris area, and the diameter of the circumscribed circle from the corrected center of the iris area to the iris area is taken as the iris diameter; if the length L1 of the first line segment is greater than 3 times the length L2 of the second line segment, then using the point on the second line segment as the center, an inscribed circle of the overlap area is drawn, the center of the inscribed circle with the smallest radius is taken as the corrected center of the iris area, and the diameter of the circumscribed circle from the corrected center of the iris area to the iris area is taken as the pixel diameter of the iris; converting the pixel diameter of the iris into the real size in the world coordinate system as the iris diameter;

[0024] To calculate the interpupillary distance of both eyes, after obtaining the circumscribed circle of the pupil, the pupil center of one eye is approximated and searched as follows:

[0025] B1) selecting a random point inside the circumscribed circle of the pupil so that the deviation of the pixel length from the random point to the boundary of the pupil area does not exceed 5%;

[0026] B2) repeating the process of B1) for two pupil regions respectively for an odd number of times not less than 5 times to obtain two sets of random points;

[0027] B3) fitting a circumscribed circle of minimum diameter to the two sets of random points respectively, taking the centers of the two circumscribed circles as the centers of the pupils, connecting the centers of the two pupils to obtain the pixel distance between the two pupils; converting the pixel distance between the two pupils into the real size in the world coordinate system to obtain the pupil distance of both eyes;

[0028] The identity of the user is identified by the main control unit searching for the closest record in the data of the iris diameter and pupil distance of the historical users after receiving the iris diameter and pupil distance of the historical users: C1) if the deviation of the iris diameter and pupil distance of the historical users in the records of the last six months and the iris diameter and pupil distance of the current user obtained is no more than 5%, it is considered that the current user is the same person as the corresponding historical user, and the main control unit asks the current user whether to use the historical eye therapy configuration. If the current user does not use the historical eye therapy configuration, the default configuration or the custom configuration is used;

[0029] C2) If in the records of the last six months, the deviation of any one of the iris diameter and pupil distance of the historical user from the data of the iris diameter and pupil distance of the current user does not exceed 5%, and the deviation of the other item is greater than 5% and does not exceed 10%, the main control unit asks whether the current user is a historical user; if the current user is a historical user, refer to C1) to use the historical eye therapy configuration or the default configuration; if the current user is not a historical user, the default configuration or the custom configuration is used;

[0030] C3) If in the records of the last six months, the deviations between the data of the iris diameter and the pupil distance of the historical user and the data of the iris diameter and the pupil distance of the current user obtained are both greater than 10%, the current user is not considered to be a historical user, and the main control unit records the iris diameter and the pupil distance of the current user, and saves the therapy configuration of the current user.

[0031] Preferably, the image processing module evaluates the dryness of the user's facial skin according to the built-in skin resistance value correction model, specifically: adj =R base ×(1+ω season ×ΔR season +ΔR weather +ω age ×ΔR age +ω gender ×ΔR gender ), where R adj is the corrected skin resistance value; R base ΔR is the basic resistance value of the skin, which is based on the average value of the skin resistance value measured by a 20-year-old man or woman in a standard environment;season is the change in skin resistance caused by seasonal factors, Where A is the ratio of the average temperature of the current season of this year to the average temperature of the corresponding season of the previous year, M is the current month, M = 1, 2, ..., 12, φ is the deviation of the current date relative to the current season; ΔR weather is the change in skin resistance caused by weather factors, ΔR weather =αH+βT+γ, where H is the air humidity on the current date, T is the ambient temperature on the current date, α is the influence coefficient of humidity on skin resistance, β is the influence coefficient of temperature on skin resistance, and γ is a constant term; ΔR age is the change in skin resistance caused by age factors, ΔR age =e k(AGE -AGE0) , where k is the age growth coefficient, AGE is the user's current age, and AGE0 is the baseline age for skin decline; ΔR gender is the change in skin resistance caused by gender factors; ω season is the weight of seasonal factors; ω age is the weight of age factor; ω gender is the weight of gender factor; the value of each weight is [-0.5, +0.5];

[0032] The image processing module estimates the corrected skin resistance value of the user according to the skin resistance correction model. If R adj ≤0.5R base , indicating that the skin is moist; if 0.5R base <R adj ≤1.5R base , indicating that the skin is normal; if R adj >1.5R base , indicating dry skin.

[0033] Further preferably, the skin resistance change ΔR caused by gender factors gender The value range of is: When the user is male, ΔR gender >1; When the user is female, ΔR gender <1.

[0034] More preferably, the output unit includes a constant current source module, a waveform control module, a relay output module, a frequency modulation module located in the body, and a conductive silicone eye mask located in the cavity;

[0035] The constant current source module includes an operational amplifier U3 and a ninth transistor Q9. The in-phase input terminal of the operational amplifier U3 is electrically connected to one end of the fifteenth resistor R5 and one end of the sixth capacitor C6, respectively. The other end of the fifteenth resistor R15 is electrically connected to one end of the fourteenth resistor R14 and one end of the fifth capacitor C5, respectively. The other end of the fourteenth resistor R14 is electrically connected to the P0.0 port of the main control unit. The inverting input terminal of the operational amplifier U3 is electrically connected to one end of the eighteenth resistor R18 and one end of the twentieth resistor R20, respectively. The other end of the twentieth resistor R20 is electrically connected to the emitter of the ninth transistor Q9, and the other end of the eighteenth resistor R18, the other end of the fifth capacitor C5 and the other end of the sixth capacitor C6 are all grounded; the output terminal of the operational amplifier U3 is electrically connected to the base of the ninth transistor Q9, and the collector of the ninth transistor Q9 is electrically connected to the +20V power supply; the emitter of the ninth transistor Q9 serves as the output terminal of the constant current source module;

[0036] The waveform control module includes a fourth transistor Q4, a fifth transistor Q5, a sixth transistor Q6 and a seventh transistor Q7, the base of the sixth transistor Q6 is electrically connected to one end of the eleventh resistor R11, the other end of the eleventh resistor R11 is electrically connected to the P0.2 port of the main control unit, the base of the seventh transistor Q7 is electrically connected to one end of the twelfth resistor R12, the other end of the twelfth resistor R12 is electrically connected to the P0.3 port of the main control unit, the emitter of the sixth transistor Q6 and the emitter of the seventh transistor Q7 are both grounded; the collector of the sixth transistor Q6 is electrically connected to the collector of the fourth transistor Q4 and one end of the ninth resistor R9, respectively, and the base of the ninth resistor R9 is electrically connected to the collector of the fourth transistor Q4 and one end of the ninth resistor R9. The other end is electrically connected to the base of the fifth triode Q5, the collector of the seventh triode Q7 is electrically connected to one end of the tenth resistor R10 and the collector of the fifth triode Q5 respectively, the other end of the tenth resistor R10 is electrically connected to the base of the fourth triode Q4, the emitter of the fourth triode Q4 and the emitter of the fifth triode Q5 are both electrically connected to the cathode of the Schottky diode D2, and the anode of the Schottky diode D2 is electrically connected to the output end of the constant current source module; the P0.2 port and the P0.3 port of the main control unit are used as the waveform input end of the waveform control module, and the collector of the sixth triode Q6 and the collector of the seventh triode Q7 are respectively used as the waveform output end of the waveform control module;

[0037] The relay output module includes a second transistor Q2, a first diode D1 and a relay K1; the base of the second transistor Q2 is electrically connected to one end of the seventh resistor R7, the other end of the seventh resistor R7 is electrically connected to the output end of the frequency modulation module, the emitter of the second transistor Q2 is grounded, the collector of the second transistor Q2 is electrically connected to the anode of the first diode D1 and one end of the coil of the relay K1 respectively, the cathode of the first diode D1 and the other end of the coil of the relay K1 are both electrically connected to the +20V power supply, the common contacts of the relay K1 are electrically connected to the waveform output ends of the waveform control module respectively, and the normally open contacts of the relay K1 are electrically connected to the conductive silicone eye mask.

[0038] Still further preferably, the water replenishment unit includes a water tank and an electric heater, the water tank is detachably arranged in the cavity, the water tank is used to store water, the water tank is provided with an electric heater, an electrode is embedded in one end of the water outlet tank close to the body, the electrode is electrically connected to the electric heater, and the electrode is also electrically connected to the P4.5 port of the main control unit through an optical coupler; the main control unit enables the electric heater when the user's skin is normal or dry, the electric heater heats the water in the water tank, and the water vapor formed by evaporation by heat humidifies the user's eye skin; the electric heater is also configured in the conductive silicone eye mask for auxiliary heating of the eye area.

[0039] Further preferably, the display unit includes an LCD screen and a backlight module, both of which are embedded in the outer surface of the main body, and the pins of the LCD screen are electrically connected to a plurality of input and output ports of the main control unit in a one-to-one correspondence; the backlight module provides backlight illumination for the LCD screen; the backlight module includes a first transistor Q1 and at least one LED lamp, the base of the first transistor Q1 is electrically connected to one end of the second resistor R2, the other end of the second resistor R2 is electrically connected to the P1.4 port of the main control unit, the emitter of the first transistor Q1 is grounded, the collector of the first transistor Q1 is electrically connected to one end of the first resistor R1, the other end of the first resistor R1 is electrically connected to the cathode of the at least one LED lamp, and the anode of the at least one LED lamp is electrically connected to a +3V power supply.

[0040] Still further preferably, the power supply unit includes a DC-DC boost module, a charging module, an LDO module and a power detection module;

[0041] The DC-DC boost module includes a boost chip U4, an eighth transistor Q8, a first MOS tube M1, a second inductor L2 and a third diode D3. Pins 4, 5 and 6 of the boost chip U4 are electrically connected to one end of the second inductor L2 and the drain of the first MOS tube M1. The source of the first MOS tube M1 is electrically connected to a +4.2V power supply and one end of a thirteenth resistor R13 respectively. The other end of the thirteenth resistor R13 is electrically connected to the gate of the first MOS tube M1 and the collector of the eighth transistor Q8 respectively. The base of the eighth transistor Q8 is electrically connected to one end of a sixteenth resistor R16. The other end of the sixteenth resistor R16 is electrically connected to the P5.5 port of the main control unit. The emitter of the eighth transistor Q8 and the boost chip U4 are electrically connected to each other. Pin 2 is grounded; the other end of the second inductor L2 is electrically connected to pin 1 of the boost chip U4 and the anode of the third diode D3 respectively; the cathode of the third diode D3 is electrically connected to one end of the nineteenth resistor R19, one end of the seventh capacitor C7 and one end of the eighth capacitor C8 respectively; the other end of the nineteenth resistor R19 is electrically connected to one end of the eleventh capacitor C11, pin 3 of the boost chip U4 and one end of the twenty-first resistor R21 respectively; the other end of the seventh capacitor C7 is electrically connected to the other end of the eleventh capacitor C11, the other end of the twenty-first resistor R21 and the ground wire respectively, and the other end of the eighth capacitor C8 is grounded; the cathode of the third diode D3 serves as the output end of the +20V power supply; the +4.2V power supply is the positive output end of the battery;

[0042] The charging module includes a charging chip U2 and a voltage regulator ED1. The TEMP pin and the GND pin of the charging chip U2 are both grounded, the PROG pin is electrically connected to one end of the seventeenth resistor R17, and the other end of the seventeenth resistor R17 is grounded; the VCC pin and the CE pin of the charging chip U2 are both electrically connected to the +5V charging voltage input terminal; the / CHRG pin of the charging chip U2 is electrically connected to the P5.3 port of the main control unit; the / STDBY pin of the charging chip U2 is electrically connected to one end of the tenth capacitor C10, one end of the voltage regulator ED1 and the ground wire, and the BAT pin of the charging chip U2 is electrically connected to the other end of the tenth capacitor C10, the other end of the voltage regulator ED1 and the positive output terminal of the battery;

[0043] The input end of the LDO module is electrically connected to the positive output end of the battery, the output end of the LDO module outputs a +3V power supply, the output end of the LDO module is also electrically connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded;

[0044] The power detection module includes a third resistor R3 and a fourth resistor R4, one end of the third resistor R3 is electrically connected to the positive output end of the battery, the other end of the third resistor R3 is electrically connected to the P5.0 port of the main control unit and one end of the fourth resistor R4, and the other end of the fourth resistor R4 is grounded.

[0045] The eye physiotherapy device combining heating and electrical stimulation provided by the present invention has the following beneficial effects compared with the prior art:

[0046] (1) The eye therapy device provided by the present invention, while stimulating the skin around the eye with microcurrent, will take into account the user's historical usage and, by recognizing eye images, identify whether the current user has used the therapy device recently, thereby being able to recommend a preferred therapy mode to the user in order to achieve a better therapy effect; for the initial theoretical user, the user's identity information will be stored for matching the next time it is used, thereby reducing the inconvenience of having to reconfigure and set each time the device is worn for therapy;

[0047] (2) By acquiring eye images in the image acquisition unit, the user's pupil distance and iris diameter are quickly estimated to verify the user's identity. Combined with the built-in skin resistance value correction model, the user's skin dryness under the current season, gender, age, etc. is estimated, so that hot water vapor can be added during the subsequent physical therapy. On the one hand, it can eliminate eye fatigue, and on the other hand, it can replenish water to the skin, reduce skin resistance, and enhance the skin's conductivity to microcurrent, thereby further improving the effect of physical therapy;

[0048] (3) Constant current output is achieved through the constant current source module, the waveform control module modulates the constant current output of the signal input to the conductive silicone eye mask, and the output is isolated through the relay output module to achieve the corresponding stimulation effect on the eye nerves and muscles; the frequency modulation module can achieve frequency modulation of microcurrent stimulation, which can achieve different stimulation effects and meet personal customization needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0050] Figure 1 This is a structural block diagram of an eye physiotherapy device combining heating and electrical stimulation according to the present invention;

[0051] Figure 2 This is a wiring diagram of a constant current source module of an eye physiotherapy device combining heating and electrical stimulation according to the present invention;

[0052] Figure 3 A wiring diagram of a waveform control module of an eye physiotherapy device combining heating and electrical stimulation according to the present invention;

[0053] Figure 4 A wiring diagram of a relay output module of an eye physiotherapy device combining heating and electrical stimulation according to the present invention;

[0054] Figure 5 This is a wiring diagram of an LCD screen of an eye physiotherapy device combining heating and electrical stimulation according to the present invention;

[0055] Figure 6 A wiring diagram of a backlight module of an eye physiotherapy device combining heating and electrical stimulation according to the present invention;

[0056] Figure 7 This is a wiring diagram of a DC-DC boost module of an eye therapy device combining heating and electrical stimulation according to the present invention;

[0057] Figure 8 A wiring diagram of a charging module of an eye physiotherapy device combining heating and electrical stimulation according to the present invention;

[0058] Fig. 9 This is a wiring diagram of an LDO module of an eye physiotherapy device combining heating and electrical stimulation according to the present invention;

[0059] Fig.10 This is a wiring diagram of a power detection module of an eye physiotherapy device combining heating and electrical stimulation according to the present invention;

[0060] Fig.11 This is a wiring diagram of a main control module of an eye therapy device combining heating and electrical stimulation according to the present invention.

[0061] Figure numerals: 1. Image acquisition unit; 2. Main control unit; 3. Output unit; 4. Water replenishment unit; 5. Display unit; 6. Power supply unit. DETAILED DESCRIPTION

[0062] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0063] like Figure 1 As shown, the present invention provides an eye therapy device combining heating and electrical stimulation, comprising a body and a headband, wherein both sides of the body are fixedly connected to both ends of the headband, the body is arranged around the eye area, and the body has a cavity in front of the eyes; the shape of the cavity is adapted to the contour of the eye. It also includes:

[0064] The image acquisition unit 1 is arranged on a side of the cavity away from the user's eyes, and is used to obtain a facial image of the user after wearing the physiotherapy device, and obtain the user's pupil distance, iris diameter, and dryness of the facial skin;

[0065] The main control unit 2 is arranged inside the main body and is connected to the output end signal of the image acquisition unit 1, and is used to identify the identity of the user according to the pupil distance and iris diameter of the user in the facial image of the user.

[0066] The output unit 3 is arranged in the cavity and is located between the user's eyes and the image acquisition unit 1. It is electrically connected to the main control unit 2 and is used to receive the output signal of the main control unit 2 to perform microcurrent stimulation of heating and frequency modulation on the user's eyes, wherein the frequency of the microcurrent stimulation is adjustable, such as switching between medium frequency and low frequency.

[0067] The water replenishment unit 4 is electrically connected to the main control unit 2, and is used to provide hot and humid steam to relieve visual fatigue, and humidify according to the dryness of the user's skin to improve the effect of micro-current stimulation;

[0068] The display unit 5 is electrically connected to the main control unit 2 for display output;

[0069] The power supply unit 6 is arranged inside the main body and is electrically connected to the image acquisition unit 1 , the main control unit 2 , the output unit 3 , the water replenishment unit 4 and the display unit 5 , respectively.

[0070] The headband is used for wearing the physiotherapy device, and the internal structure of the body is hollowed out and sealed to facilitate the configuration of core parts such as the power supply unit, the main control unit, and the image acquisition unit 1.

[0071] The image acquisition unit 1 includes an infrared camera and an image processing module; the infrared camera is connected to the image processing module in communication; the infrared machine obtains a grayscale image of the user's eye and sends the infrared image to the image processing module; the image processing module calculates the user's pupil distance and iris diameter through a built-in image processing algorithm, and on the other hand, the image processing module evaluates the dryness of the user's facial skin according to a built-in skin resistance value correction model. The dryness of facial skin is usually divided into moist, normal and dry types. Moist skin has a small resistance, which is beneficial to the transmission of microcurrent signals, while normal and dry skin types are not conducive to the transmission of microcurrent signals and may need to be hydrated.

[0072] In the above content, the image processing algorithm includes the following:

[0073] S100: preprocessing the acquired grayscale image of the user's eye, specifically, performing sampling Gaussian blurring to remove noise and performing histogram equalization to enhance contrast;

[0074] Gaussian blur processing can eliminate noise in the image and reduce false detection in subsequent edge detection. In this embodiment, the size of the Gaussian kernel is (5,5). Histogram equalization can improve the contrast of the image and make the details in the image more obvious.

[0075] S200: edge detection is performed on the preprocessed grayscale image, and the eyelid contour is highlighted using the edge detection algorithm CANNY;

[0076] The gradient amplitude and direction are calculated according to the Sobel operator, and the gradient strength of each pixel is retained to see whether it is a local maximum. If so, the pixel is retained; if not, the pixel is suppressed.

[0077] S300: setting a gradient threshold, extracting the eyelid regions of both eyes from the eyelid contours, and deleting the image of the non-eyelid region;

[0078] The grayscale threshold lower limit is set to 50, the grayscale threshold upper limit is set to 150, and the grayscale value between the grayscale threshold lower limit and the grayscale threshold upper limit is considered to be the edge. The contour, that is, the eyelid range, is extracted from the edge image.

[0079] S400: Obtain the iris diameter and pupil distance of both eyes within the retained eyelid image range, and identify the user's identity.

[0080] In step S400, the iris diameters of both eyes are obtained within the eyelid range. Within the eyelid region, the white of the eye, the iris and the pupil regions are separated from each other by grayscale threshold segmentation. The first grayscale threshold of the pupil is set to [0, 50] and the second grayscale threshold of the iris is set to (50, 200). The pupil and iris regions are extracted respectively, and the circumscribed circles of the pupil and iris regions are obtained by circular fitting. On the circumscribed circle of the iris, the center of the iris region is fitted again by fitting a circle:

[0081] A1) on the circumscribed circle of the iris region, three different boundary points are randomly selected each time as the center of the circle and three groups of fitting circles are drawn according to the radius of the circular boundary of the current iris region, wherein the three groups of fitting circles do not overlap with each other and the spacings between them are not completely equal;

[0082] A2) recording the closest points of the three groups of fitted circles drawn each time inside the iris area and connecting them in sequence to form a triangle;

[0083] A3) repeatedly drawing three groups of virtual circles and again forming a triangle based on the closest points of the three groups of fitted circles inside the iris area; so that the number of times the three groups of virtual circles are drawn is an odd number of times not less than 5;

[0084] A4) A triangle obtained by connecting the nearest points of the three groups of virtual circles drawn multiple times inside the iris region is subjected to Boolean operation to obtain an overlap region, and two non-adjacent endpoints are arbitrarily connected in the overlap region to obtain a first line segment and a second line segment that intersect each other, and the length L1 of the first line segment is greater than the length L2 of the second line segment. If the length L1 of the first line segment is ≤ 3 times the length L2 of the second line segment, an ellipse inscribed in the overlap region is drawn with the first line segment as the major axis, the center of the ellipse with the smallest area is taken as the corrected center of the iris region, and the diameter of the circumscribed circle from the corrected center of the iris region to the iris region is taken as the iris diameter; if the length L1 of the first line segment is greater than 3 times the length L2 of the second line segment, an inscribed circle of the overlap region is drawn with a point on the second line segment as the center, the center of the inscribed circle with the smallest radius is taken as the corrected center of the iris region, and the diameter of the circumscribed circle from the corrected center of the iris region to the iris region is taken as the pixel diameter of the iris; the pixel diameter of the iris is converted into a real size in the world coordinate system as the iris diameter.

[0085] By comparing the lengths of the first line segment and the second line segment, if the diagonal length ratio of the overlapping area does not exceed 3 times, the iris center is found by making a circumscribed circle for the first line segment, and if the diagonal length ratio of the overlapping area exceeds 3 times, the iris center is found by the second line segment, and the iris diameter is obtained. For the human body, the iris diameter and pupil distance are usually unchanged in a certain age group, so they can be used for rapid identity recognition, thereby reducing the time for the user to adjust the eye therapy device and improving the user experience.

[0086] Usually, the center of the pupil does not coincide with the center of the iris, so when calculating the pupil distance, the center position of the pupil must be obtained first. In this embodiment, the pupil distance of both eyes is calculated by obtaining the circumscribed circle of the pupil and then performing a monocular pupil center approximation search as follows:

[0087] B1) selecting a random point inside the circumscribed circle of the pupil so that the deviation of the pixel length from the random point to the boundary of the pupil area does not exceed 5%;

[0088] B2) repeating the process of B1) for two pupil regions respectively for an odd number of times not less than 5 times to obtain two sets of random points;

[0089] B3) fitting a circumscribed circle of minimum diameter to the two sets of random points respectively, taking the centers of the two circumscribed circles as the centers of the pupils, connecting the centers of the two pupils to obtain the pixel distance between the two pupils; converting the pixel distance between the two pupils into the real size in the world coordinate system to obtain the pupil distance of both eyes.

[0090] The identity of the user is identified by the main control unit 2 searching for the closest record in the data of the iris diameter and the pupil distance of the historical users after receiving the iris diameter and the pupil distance of the historical users: C1) if the deviation of the iris diameter and the pupil distance of the historical users in the records of the last six months and the iris diameter and the pupil distance of the current user obtained is no more than 5%, it is considered that the current user and the corresponding historical user are the same person, and the main control unit 2 asks the current user whether to use the historical eye therapy configuration. If the current user does not use the historical eye therapy configuration, the default configuration or the custom configuration is used;

[0091] C2) If in the records of the last six months, the deviation of any one of the iris diameter and the pupil distance of the eyes of the historical user from the data of the iris diameter and the pupil distance of the eyes of the current user obtained does not exceed 5%, and the deviation of the other item is greater than 5% and does not exceed 10%, the main control unit 2 inquires whether the current user is a historical user; if the current user is a historical user, refer to C1) to use the historical eye therapy configuration or the default configuration; if the current user is not a historical user, the default configuration or the custom configuration is used;

[0092] C3) If in the records of the last six months, the deviations between the data of the iris diameter and the pupil distance of the historical user and the data of the iris diameter and the pupil distance of the current user obtained are both greater than 10%, the current user is not considered to be a historical user, and the main control unit 2 records the iris diameter and the pupil distance of the current user, and saves the therapy configuration of the current user.

[0093] We only compare historical data from the past six months because pupil distance or iris diameter may change with age and disease, and older data are of little value for reference and comparison.

[0094] The default configuration mentioned here specifically refers to the following method for stimulation from weak to strong. According to the different selected durations, two embodiments of 10 minutes and 15 minutes are given. As can be seen from the following table, the pulse interval time is gradually shortened and the stimulation frequency is getting higher and higher.

[0095] Table 1 Default configuration 10-minute mode

[0096] Pulse period Pulse duty cycle Number of pulses Pulse cycle times Pulse interval time 200μs 100μs 5 487 249.35ms 200μs 100μs 5 690 166.30ms 200μs 100μs 5 900 124.28ms 200μs 100μs 5 1200 99.26ms 200μs 100μs 5 160 66.24ms 200μs 100μs 5 176 49.23ms 200μs 100μs 5 220 33.22ms 200μs 100μs 5 290 24.22ms 200μs 100μs 5 440 16.11ms 200μs 100μs 5 580 12.21ms 200μs 100μs 5 5500 9.21ms 200μs 100μs 5 6000 5.73ms

[0097] Table 2 Default configuration 15-minute mode

[0098]

[0099]

[0100] Whether it is necessary to replenish water during stimulation therapy, the image processing module evaluates the dryness of the user's facial skin according to the built-in skin resistance value correction model. The specific content is: adj =R base ×(1+ω season ×ΔR season +ΔR weather +ω age ×ΔR age +ω gender ×ΔR gender ), where R adj is the corrected skin resistance value; R base ΔR is the basic resistance value of the skin, which is based on the average value of the skin resistance value measured by a 20-year-old man or woman in a standard environment; season is the change in skin resistance caused by seasonal factors, Where A is the ratio of the average temperature of the current season of this year to the average temperature of the corresponding season of the previous year, M is the current month, M = 1, 2, ..., 12, φ is the deviation of the current date relative to the current season; ΔR weather is the change in skin resistance caused by weather factors, ΔR weather =αH+βT+γ, where H is the air humidity on the current date, T is the ambient temperature on the current date, α is the influence coefficient of humidity on skin resistance, β is the influence coefficient of temperature on skin resistance, and γ is a constant term; ΔR age is the change in skin resistance caused by age factors, ΔR age =e k(AGE-AGE0) , where k is the age growth coefficient, AGE is the user's current age, and AGE0 is the baseline age for skin decline; ΔR gender is the change in skin resistance caused by gender factors; ω season is the weight of seasonal factors; ω age is the weight of age factor; ω gender is the weight of gender factor; the value of each weight is [-0.5, +0.5];

[0101] The image processing module estimates the corrected skin resistance value of the user according to the skin resistance correction model. adj ≤0.5R base , indicating that the skin is moist; if 0.5R base <R adj ≤1.5R base , indicating that the skin is normal; if R adj >1.5R base , indicating dry skin.

[0102] Change in skin resistance ΔR caused by gender factors genderThe value range of is: When the user is male, ΔR gender >1; When the user is female, ΔR gender <1.

[0103] The calculation of the above skin resistance value is not based on images, but fully considers the impact of the user's age, gender, current season and weather conditions on human skin, and estimates the approximate distribution of the user's skin resistance under current conditions, so as to perform targeted hydration operations, thereby improving the shortcomings of unsatisfactory therapeutic effects caused by dry skin and excessively high resistance.

[0104] like Figure 2 , Figure 3 and Figure 4 As shown, the output unit 3 includes a constant current source module, a waveform control module, a relay output module, a frequency modulation module, and a conductive silicone eye mask located in the cavity;

[0105] The constant current source module includes an operational amplifier U3 and a ninth transistor Q9. The in-phase input terminal of the operational amplifier U3 is electrically connected to one end of the fifteenth resistor R5 and one end of the sixth capacitor C6 respectively. The other end of the fifteenth resistor R15 is electrically connected to one end of the fourteenth resistor R14 and one end of the fifth capacitor C5 respectively. The other end of the fourteenth resistor R14 is electrically connected to the P0.0 port of the main control unit 2. The inverting input terminal of the operational amplifier U3 is electrically connected to one end of the eighteenth resistor R18 and one end of the twentieth resistor R20 respectively. The other end of the twentieth resistor R20 is electrically connected to the emitter of the ninth transistor Q9. The other end of the eighteenth resistor R18, the other end of the fifth capacitor C5 and the other end of the sixth capacitor C6 are all grounded. The output terminal of the operational amplifier U3 is electrically connected to the base of the ninth transistor Q9, and the collector of the ninth transistor Q9 is electrically connected to the +20V power supply. The emitter of the ninth transistor Q9 serves as the output terminal of the constant current source module. Figure 2 As shown, the P0.0 port of the main control unit 2 is the intensity control terminal, and the intensity control signal output by the port forms an input voltage through the fourteenth resistor R14, and the fifteenth resistor R15 and the fifth capacitor C5 form a low-pass filter to filter out high-frequency noise and stabilize the input signal. The filtered signal is coupled to the in-phase input terminal of the operational amplifier U3 through the sixth capacitor C6, and the operational amplifier U3 adjusts the base current of the ninth transistor Q9. The twentieth resistor R20 and the eighteenth resistor R18 together form a negative feedback circuit to control the gain of the operational amplifier U3. When the ninth transistor Q9 is turned on, the amplified signal is output from the emitter, and the output current intensity is determined by the output voltage of the operational amplifier and the transistor characteristics. Due to the existence of the negative feedback link, the operational amplifier U3 can stably maintain the preset gain multiple, so that the output voltage follows the change of the intensity control signal, thereby ensuring the stable operation of the constant current source.

[0106] The waveform control module includes a fourth transistor Q4, a fifth transistor Q5, a sixth transistor Q6 and a seventh transistor Q7, the base of the sixth transistor Q6 is electrically connected to one end of the eleventh resistor R11, the other end of the eleventh resistor R11 is electrically connected to the P0.2 port of the main control unit 2, the base of the seventh transistor Q7 is electrically connected to one end of the twelfth resistor R12, the other end of the twelfth resistor R12 is electrically connected to the P0.3 port of the main control unit 2, the emitter of the sixth transistor Q6 and the emitter of the seventh transistor Q7 are both grounded; the collector of the sixth transistor Q6 is electrically connected to the collector of the fourth transistor Q4 and one end of the ninth resistor R9 respectively, the ninth resistor R9 The other end of is electrically connected to the base of the fifth triode Q5, the collector of the seventh triode Q7 is electrically connected to one end of the tenth resistor R10 and the collector of the fifth triode Q5 respectively, the other end of the tenth resistor R10 is electrically connected to the base of the fourth triode Q4, the emitter of the fourth triode Q4 and the emitter of the fifth triode Q5 are both electrically connected to the cathode of the Schottky diode D2, and the anode of the Schottky diode D2 is electrically connected to the output end of the constant current source module; the P0.2 port and the P0.3 port of the main control unit 2 serve as the waveform input end of the waveform control module, and the collector of the sixth triode Q6 and the collector of the seventh triode Q7 serve as the waveform output end of the waveform control module respectively.

[0107] like Figure 3 As shown, the waveform A from the main control unit 2 is used to drive the sixth transistor Q6, and the waveform B is used to drive the seventh transistor Q7. When the waveform A is at a high level, the sixth transistor Q6 is turned on, and the collector voltage of the sixth transistor Q6 decreases, thereby reducing the base voltage of the fourth transistor Q4, so that the fourth transistor Q4 is turned on. When the waveform A is at a low level, the sixth transistor Q6 is turned off, its collector voltage remains unchanged, and the base voltage of the fourth transistor Q4 is relatively high, so that the fourth transistor Q4 is turned off. The sixth transistor Q6 and the fourth transistor Q4 work synchronously.

[0108] When waveform B is at a high level, the seventh triode Q7 is turned on, and the collector voltage of the seventh triode Q7 decreases, thereby reducing the base voltage of the fifth triode Q5, so that the fifth triode Q5 is turned on. When waveform B is at a low level, the seventh triode Q7 is turned off, and its collector voltage remains unchanged. The base voltage of the fifth triode Q5 is relatively high, so that the fifth triode Q5 is turned off. The seventh triode Q7 and the fifth triode Q5 work synchronously. Schottky diode D2 plays a protective role. The ninth resistor R9 and the tenth resistor R10 are current limiting resistors.

[0109] The waveform control module generates a specific output signal through logical control of waveform A and waveform B, that is, waveform A and waveform B control the current and voltage of output A and output B respectively, thereby realizing output control of the load, that is, the conductive silicone eye mask for microcurrent stimulation.

[0110] like Figure 4 As shown, the relay output module includes a second transistor Q2, a first diode D1 and a relay K1; the base of the second transistor Q2 is electrically connected to one end of the seventh resistor R7, the other end of the seventh resistor R7 is electrically connected to the output end of the frequency modulation module, the emitter of the second transistor Q2 is grounded, the collector of the second transistor Q2 is electrically connected to the anode of the first diode D1 and one end of the coil of the relay K1, respectively, the cathode of the first diode D1 and the other end of the coil of the relay K1 are electrically connected to the +20V power supply, the common contacts of the relay K1 are electrically connected to the waveform output ends of the waveform control module, and the normally open contacts of the relay K1 are electrically connected to the conductive silicone eye mask.

[0111] The relay output module drives the voltage output of the stronger A output and B output signals through the low-frequency or intermediate-frequency signal output by the frequency modulation module, thereby realizing the effect of isolated driving and frequency regulation. The frequency modulation module usually includes a first frequency signal source, a second frequency signal source, a mixer, a bandpass filter and an output power amplifier; the outputs of the first frequency signal source and the second frequency signal source are both sent to the mixer, the first frequency signal source is a low-frequency signal, and the second frequency signal source is an unmodulated intermediate frequency or high-frequency signal, and the mixer mixes the input low-frequency signal and the intermediate frequency or high-frequency signal; then the signal output by the mixer is filtered through a bandpass filter to remove unnecessary low-frequency or high-frequency components to achieve low-frequency modulation of the intermediate frequency; then the output is enhanced through the output power amplifier to improve the driving ability of the second transistor Q2, and realize the high-frequency or low-frequency switching output of the A output signal / B output signal to meet the customized physical therapy needs of the user. The frequency band of the bandpass filter is different, and the output frequency is also different. The frequency modulation module adopts a conventional structure, and this scheme does not involve improvements to the structure of the frequency modulation module.

[0112] The water replenishment unit 4 includes a water storage tank and an electric heater. The water storage tank is detachably arranged in the cavity. The water storage tank is used to store water. The water storage tank is provided with an electric heater. An electrode is embedded in one end of the water outlet tank close to the body. The electrode is electrically connected to the electric heater. The electrode is also electrically connected to the P4.5 port of the main control unit 2 through an optical coupler. The main control unit 2 enables the electric heater when the user's skin is normal or dry. The electric heater heats the water in the water storage tank, and the water vapor formed by the heat evaporation humidifies the user's eye skin. The content of judging the user's skin condition is obtained by estimating the content of the built-in skin resistance value correction model as described above by the image processing module. If the skin is normal, the electric heater can be turned on intermittently. If the skin is dry, the electric heater will work continuously or intermittently to provide water vapor to replenish the skin while avoiding excessively high water vapor temperature. The electric heater is also configured in the conductive silicone eye mask for auxiliary heating of the eye area.

[0113] like Figure 5 and Figure 6 As shown, the display unit 5 includes an LCD screen and a backlight module, both of which are embedded in the outer surface of the body, and the pins of the LCD screen are electrically connected to the input and output ports of the main control unit 2 in a one-to-one correspondence; the backlight module provides backlight illumination to the LCD screen; the backlight module includes a first transistor Q1 and at least one LED lamp, the base of the first transistor Q1 is electrically connected to one end of the second resistor R2, the other end of the second resistor R2 is electrically connected to the P1.4 port of the main control unit 2, the emitter of the first transistor Q1 is grounded, the collector of the first transistor Q1 is electrically connected to one end of the first resistor R1, the other end of the first resistor R1 is electrically connected to the cathode of at least one LED lamp, and the anode of at least one LED lamp is electrically connected to the +3V power supply. The LCD screen can display the start time, remaining time, user identity and other contents of the current eye therapy at the output end. The backlight module is used to provide backlight illumination to the LCD screen when the environment is relatively dark.

[0114] like Figure 7 , Figure 8 , Fig. 9 and Fig.10 As shown, the power supply unit 6 includes a DC-DC boost module, a charging module, an LDO module and a power detection module.

[0115] The DC-DC boost module includes a boost chip U4, an eighth transistor Q8, a first MOS transistor M1, a second inductor L2 and a third diode D3. Pins 4, 5 and 6 of the boost chip U4 are electrically connected to one end of the second inductor L2 and the drain of the first MOS transistor M1. The source of the first MOS transistor M1 is electrically connected to a +4.2V power supply and one end of a thirteenth resistor R13 respectively. The other end of the thirteenth resistor R13 is electrically connected to the gate of the first MOS transistor M1 and the collector of the eighth transistor Q8 respectively. The base of the eighth transistor Q8 is electrically connected to one end of a sixteenth resistor R16. The other end of the sixteenth resistor R16 is electrically connected to the P5.5 port of the main control unit 2. The emitter of the eighth transistor Q8 and the boost chip U4 are electrically connected to the P5.5 port of the main control unit 2. 4 is grounded; the other end of the second inductor L2 is electrically connected to the pin 1 of the boost chip U4 and the anode of the third diode D3 respectively, the cathode of the third diode D3 is electrically connected to one end of the nineteenth resistor R19, one end of the seventh capacitor C7 and one end of the eighth capacitor C8 respectively, the other end of the nineteenth resistor R19 is electrically connected to one end of the eleventh capacitor C11, the pin 3 of the boost chip U4 and one end of the twenty-first resistor R21 respectively, the other end of the seventh capacitor C7 is electrically connected to the other end of the eleventh capacitor C11, the other end of the twenty-first resistor R21 and the ground wire respectively, and the other end of the eighth capacitor C8 is grounded; the cathode of the third diode D3 serves as the output end of the +20V power supply; the +4.2V power supply is the positive output end of the battery.

[0116] The boost chip U4 uses B628_SX108, which is used to boost the input voltage between -0.3V and 26V to the range of -0.3V to 30V. The output voltage of the boost chip U4 is calculated by the formula VOUT = VREF × (1 + R19 / R21). The reference voltage VREF is usually 0.6V, then VOUT = 33 × 0.6 = 19.8V, which is approximately equal to 20V. The boost enable signal is used to drive the first MOS tube M1 to turn on and input the work enable signal of the boost chip U4.

[0117] The charging module includes a charging chip U2 and a voltage regulator ED1. The TEMP pin and GND pin of the charging chip U2 are both grounded, the PROG pin is electrically connected to one end of the seventeenth resistor R17, and the other end of the seventeenth resistor R17 is grounded; the VCC pin and CE pin of the charging chip U2 are both electrically connected to the +5V charging voltage input terminal; the / CHRG pin of the charging chip U2 is electrically connected to the P5.3 port of the main control unit 2; the / STDBY pin of the charging chip U2 is electrically connected to one end of the tenth capacitor C10, one end of the voltage regulator ED1 and the ground wire respectively, and the BAT pin of the charging chip U2 is electrically connected to the other end of the tenth capacitor C10, the other end of the voltage regulator ED1 and the positive output terminal of the battery respectively. The PROG pin is the constant current charging setting terminal, and the size of the charging current is determined by the external seventeenth resistor R17.

[0118] The input end of the LDO module is electrically connected to the positive output end of the battery, and the output end of the LDO module outputs +3V power. The output end of the LDO module is also electrically connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded. The LDO module is used to output +3V power for the backlight module and the main control unit 2.

[0119] The power detection module includes a third resistor R3 and a fourth resistor R4. One end of the third resistor R3 is electrically connected to the positive output terminal of the battery. The other end of the third resistor R3 is electrically connected to the P5.0 port of the main control unit 2 and one end of the fourth resistor R4 respectively. The other end of the fourth resistor R4 is grounded. The power detection module obtains the output voltage of the positive electrode of the battery to determine whether the current remaining capacity meets the power consumption requirement of the therapy. If it does, no alarm signal is issued. If it does not, the buzzer is activated to remind the user to charge in time. The +5V charging voltage used by the charging module, i.e. Figure 8 The USB5V signal can come from the common TYPE-C charging interface or Microusb interface, which will not be repeated here.

[0120] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An eye therapy device combining heating and electrical stimulation, comprising a body and a headband, wherein two sides of the body are fixedly connected to two ends of the headband respectively, the body is arranged around the eye area, and the body has a cavity in front of the eyes; characterized in that: Also includes: An image acquisition unit (1) is arranged on a side of the cavity away from the user's eyes and is used to acquire a facial image of the user after the user wears the physiotherapy device, and to acquire the user's pupil distance, iris diameter, and dryness of the facial skin; A main control unit (2) is arranged inside the main body and is connected to the output end signal of the image acquisition unit (1), and is used to identify the identity of the user based on the pupil distance and iris diameter of the user in the facial image of the user; An output unit (3) is arranged in the cavity and between the user's eyes and the image acquisition unit (1), and is electrically connected to the main control unit (2) and is used to receive an output signal from the main control unit (2) to perform heating and frequency-modulated micro-current stimulation on the user's eyes; The water replenishment unit (4) is electrically connected to the main control unit (2) and is used to provide hot and humid steam to relieve visual fatigue and humidify the skin according to the dryness of the user to improve the effect of micro-current stimulation; A display unit (5), electrically connected to the main control unit (2) and used for display output; The power supply unit (6) is arranged inside the main body and is electrically connected to the image acquisition unit (1), the main control unit (2), the output unit (3), the water replenishment unit (4) and the display unit (5) respectively.

2. The eye physiotherapy device combining heating and electrical stimulation according to claim 1, characterized in that: The image acquisition unit (1) comprises an infrared camera and an image processing module; the infrared camera is in communication connection with the image processing module; the infrared camera acquires a grayscale image of the user's eye and sends the infrared image to the image processing module; On the one hand, the image processing module calculates the user's pupil distance and iris diameter through a built-in image processing algorithm. On the other hand, the image processing module evaluates the dryness of the user's facial skin based on a built-in skin resistance value correction model.

3. The eye physiotherapy device combining heating and electrical stimulation according to claim 2, characterized in that: Image processing algorithms include the following: Preprocessing the acquired grayscale image of the user's eye, specifically sampling Gaussian blur denoising and histogram equalization to enhance contrast; Perform edge detection on the preprocessed grayscale image and use the edge detection algorithm CANNY to highlight the eyelid contour; Set the gradient threshold, extract the eyelid area of ​​both eyes from the eyelid contour, and delete the image of the non-eyelid area; The iris diameter and pupil distance of both eyes are obtained within the retained eyelid image, and the user's identity is identified.

4. The eye therapy device combining heating and electrical stimulation according to claim 3, characterized in that: The iris diameter of both eyes is obtained within the eyelid range. The eye white, iris and pupil regions are separated from each other by grayscale threshold segmentation within the eyelid region. The first grayscale threshold of the pupil is set to [0, 50] and the second grayscale threshold of the iris is set to (50, 200] to extract the pupil and iris regions respectively. The circumscribed circles of the pupil and iris regions are obtained by circular fitting. On the circumscribed circle of the iris, the center of the iris region is fitted again by fitting a circle: A1) on the circumscribed circle of the iris region, three different boundary points are randomly selected each time as the center of the circle and three groups of fitting circles are drawn according to the radius of the circular boundary of the current iris region, wherein the three groups of fitting circles do not overlap with each other and the spacings between them are not completely equal; A2) recording the closest points of the three groups of fitted circles drawn each time inside the iris area and connecting them in sequence to form a triangle; A3) repeatedly drawing three groups of virtual circles and again forming a triangle based on the closest points of the three groups of fitted circles inside the iris area; so that the number of times the three groups of virtual circles are drawn is an odd number of times not less than 5; A4) performing Boolean operations on triangles obtained by connecting the nearest points of three groups of virtual circles drawn multiple times inside the iris region to obtain an overlap region, and arbitrarily connecting two non-adjacent endpoints in the overlap region to obtain a first line segment and a second line segment that intersect each other, wherein the length L1 of the first line segment is greater than the length L2 of the second line segment, and if the length L1 of the first line segment is ≤ 3 times the length L2 of the second line segment, then using the first line segment as the major axis, an ellipse inscribed in the overlap region is drawn, the center of the ellipse with the smallest area is taken as the corrected center of the iris region, and the diameter of the circumscribed circle from the corrected center of the iris region to the iris region is taken as the iris diameter; if the length L1 of the first line segment is greater than 3 times the length L2 of the second line segment, then using a point on the second line segment as the center, an inscribed circle is drawn in the overlap region, the center of the inscribed circle with the smallest radius is taken as the corrected center of the iris region, and the diameter of the circumscribed circle from the corrected center of the iris region to the iris region is taken as the pixel diameter of the iris; The pixel diameter of the iris is converted into the real size in the world coordinate system as the diameter of the iris; To calculate the interpupillary distance of both eyes, after obtaining the circumscribed circle of the pupil, the pupil center of one eye is approximated and searched as follows: B1) selecting a random point inside the circumscribed circle of the pupil so that the deviation of the pixel length from the random point to the boundary of the pupil area does not exceed 5%; B2) repeating the process of B1) for two pupil regions respectively for an odd number of times not less than 5 times to obtain two sets of random points; B3) fitting a circumscribed circle of minimum diameter to the two sets of random points respectively, taking the centers of the two circumscribed circles as the centers of the pupils, connecting the centers of the two pupils to obtain the pixel distance between the two pupils; converting the pixel distance between the two pupils into the real size in the world coordinate system to obtain the pupil distance of both eyes; The identity of the user is identified by the main control unit (2) searching for the closest record in the data of the iris diameter and the pupil distance of the eyes of the historical users after receiving the iris diameter and the pupil distance of the eyes of the historical users: C1) if the deviation between the iris diameter and the pupil distance of the eyes of the historical users in the records of the last six months and the iris diameter and the pupil distance of the eyes of the current user obtained is no more than 5%, then it is considered that the current user and the corresponding historical user are the same person, and the main control unit (2) inquires whether the current user uses the historical eye therapy configuration, and if the current user does not use the historical eye therapy configuration, then the default configuration or the custom configuration is used; C2) If in the records of the last six months, the deviation of any one of the iris diameter and the pupil distance of the eyes of the historical user from the data of the iris diameter and the pupil distance of the eyes of the current user obtained does not exceed 5%, and the deviation of the other item is greater than 5% and does not exceed 10%, then the main control unit (2) inquires whether the current user is a historical user; if the current user is a historical user, refer to C1) to use the historical eye therapy configuration or the default configuration; if the current user is not a historical user, then the default configuration or the custom configuration is used; C3) If the deviation between the iris diameter and pupil distance of the historical user in the records of the last six months and the iris diameter and pupil distance of the current user obtained is greater than 10%, the current user is not considered to be a historical user, and the main control unit (2) records the iris diameter and pupil distance of the current user and saves the physical therapy configuration of the current user.

5. The eye therapy device combining heating and electrical stimulation according to claim 2, characterized in that: The image processing module evaluates the dryness of the user's facial skin based on the built-in skin resistance correction model. The specific content is: R adj =R base ×(1+ω season ×ΔR season +ΔR weather +ω age ×ΔR age +ω gender ×ΔR gender ), where R adj is the corrected skin resistance value; R base ΔR is the basic resistance value of the skin, which is based on the average value of the skin resistance value measured by a 20-year-old man or woman in a standard environment; season is the change in skin resistance caused by seasonal factors, Where A is the ratio of the average temperature of the current season of this year to the average temperature of the corresponding season of the previous year, M is the current month, M = 1, 2, ..., 12, φ is the deviation of the current date relative to the current season; ΔR weather is the change in skin resistance caused by weather factors, ΔR weather =αH+βT+γ, where H is the air humidity on the current date, T is the ambient temperature on the current date, α is the influence coefficient of humidity on skin resistance, β is the influence coefficient of temperature on skin resistance, and γ is a constant term; ΔR age is the change in skin resistance caused by age factors, ΔR age =e k(AGE-AGE0) , where k is the age growth coefficient, AGE is the user's current age, and AGE0 is the baseline age for skin decline; ΔR gender is the change in skin resistance caused by gender factors; ω season is the weight of seasonal factors; ω age is the weight of age factor; ω gender is the weight of gender factor; the value of each weight is [-0.5, +0.5]; The image processing module estimates the corrected skin resistance value of the user according to the skin resistance correction model. If R adj ≤0.5R base , indicating that the skin is moist; if 0.5R base <R adj ≤1.5R base , indicating that the skin is normal; if R adj >1.5R base , indicating dry skin.

6. The eye physiotherapy device combining heating and electrical stimulation according to claim 5, characterized in that: Change in skin resistance ΔR caused by gender factors gender The value range of is: When the user is male, ΔR gender >1; When the user is female, ΔR gender <1.

7. The eye physiotherapy device combining heating and electrical stimulation according to claim 5, characterized in that: The output unit (3) comprises a constant current source module, a waveform control module, a relay output module, a frequency modulation module located in the body, and a conductive silicone eye mask located in the cavity; The constant current source module comprises an operational amplifier U3 and a ninth transistor Q9, wherein the in-phase input terminal of the operational amplifier U3 is electrically connected to one end of a fifteenth resistor R5 and one end of a sixth capacitor C6 respectively, the other end of the fifteenth resistor R15 is electrically connected to one end of a fourteenth resistor R14 and one end of a fifth capacitor C5 respectively, the other end of the fourteenth resistor R14 is electrically connected to the P0.0 port of the main control unit (2), the inverting input terminal of the operational amplifier U3 is electrically connected to one end of an eighteenth resistor R18 and one end of a twentieth resistor R20 respectively, the other end of the twentieth resistor R20 is electrically connected to the emitter of the ninth transistor Q9, the other end of the eighteenth resistor R18, the other end of the fifth capacitor C5 and the other end of the sixth capacitor C6 are all grounded; the output terminal of the operational amplifier U3 is electrically connected to the base of the ninth transistor Q9, the collector of the ninth transistor Q9 is electrically connected to a +20V power supply; the emitter of the ninth transistor Q9 serves as the output terminal of the constant current source module; The waveform control module comprises a fourth triode Q4, a fifth triode Q5, a sixth triode Q6 and a seventh triode Q7, the base of the sixth triode Q6 is electrically connected to one end of an eleventh resistor R11, the other end of the eleventh resistor R11 is electrically connected to a P0.2 port of the main control unit (2), the base of the seventh triode Q7 is electrically connected to one end of a twelfth resistor R12, the other end of the twelfth resistor R12 is electrically connected to a P0.3 port of the main control unit (2), the emitter of the sixth triode Q6 and the emitter of the seventh triode Q7 are both grounded; the collector of the sixth triode Q6 is electrically connected to the collector of the fourth triode Q4 and one end of a ninth resistor R9 respectively, the ninth resistor R12 is electrically connected to a P0.4 port of the main control unit (2), and the emitter of the sixth triode Q6 and the emitter of the seventh triode Q7 are both grounded. The other end of 9 is electrically connected to the base of the fifth triode Q5, the collector of the seventh triode Q7 is electrically connected to one end of the tenth resistor R10 and the collector of the fifth triode Q5 respectively, the other end of the tenth resistor R10 is electrically connected to the base of the fourth triode Q4, the emitter of the fourth triode Q4 and the emitter of the fifth triode Q5 are both electrically connected to the cathode of the Schottky diode D2, and the anode of the Schottky diode D2 is electrically connected to the output end of the constant current source module; the P0.2 port and the P0.3 port of the main control unit (2) serve as the waveform input end of the waveform control module, and the collector of the sixth triode Q6 and the collector of the seventh triode Q7 serve as the waveform output end of the waveform control module respectively; The relay output module includes a second transistor Q2, a first diode D1 and a relay K1; the base of the second transistor Q2 is electrically connected to one end of the seventh resistor R7, the other end of the seventh resistor R7 is electrically connected to the output end of the frequency modulation module, the emitter of the second transistor Q2 is grounded, the collector of the second transistor Q2 is electrically connected to the anode of the first diode D1 and one end of the coil of the relay K1 respectively, the cathode of the first diode D1 and the other end of the coil of the relay K1 are both electrically connected to the +20V power supply, the common contacts of the relay K1 are electrically connected to the waveform output ends of the waveform control module respectively, and the normally open contacts of the relay K1 are electrically connected to the conductive silicone eye mask.

8. The eye physiotherapy device combining heating and electrical stimulation according to claim 7, characterized in that: The water replenishment unit (4) comprises a water storage tank and an electric heater. The water storage tank is detachably arranged in the cavity. The water storage tank is used to store water. The water storage tank is provided with an electric heater. An electrode is embedded in one end of the water outlet tank close to the body. The electrode is electrically connected to the electric heater. The electrode is also electrically connected to the P4.5 port of the main control unit (2) through an optical coupler. When the user's skin is normal or dry, the main control unit (2) enables the electric heater. The electric heater heats the water in the water storage tank. The water vapor formed by evaporation due to the heat humidifies the user's eye skin. The electric heater is also arranged in the conductive silicone eye mask for auxiliary heating of the eye area.

9. The eye physiotherapy device combining heating and electrical stimulation according to claim 8, characterized in that: The display unit (5) comprises an LCD screen and a backlight module, both of which are embedded in the outer surface of the body, and the pins of the LCD screen are electrically connected to a plurality of input and output ports of the main control unit (2) in a one-to-one correspondence; the backlight module provides backlight illumination for the LCD screen; the backlight module comprises a first transistor Q1 and at least one LED lamp, the base of the first transistor Q1 is electrically connected to one end of a second resistor R2, the other end of the second resistor R2 is electrically connected to a P1.4 port of the main control unit (2), the emitter of the first transistor Q1 is grounded, the collector of the first transistor Q1 is electrically connected to one end of the first resistor R1, the other end of the first resistor R1 is electrically connected to a cathode of the at least one LED lamp, and the anode of the at least one LED lamp is electrically connected to a +3V power supply.

10. The eye physiotherapy device combining heating and electrical stimulation according to claim 9, characterized in that: The power supply unit (6) comprises a DC-DC boost module, a charging module, an LDO module and a power detection module; The DC-DC boost module comprises a boost chip U4, an eighth transistor Q8, a first MOS transistor M1, a second inductor L2 and a third diode D3. Pins 4, 5 and 6 of the boost chip U4 are electrically connected to one end of the second inductor L2 and the drain of the first MOS transistor M1. The source of the first MOS transistor M1 is electrically connected to a +4.2V power supply and one end of a thirteenth resistor R13 respectively. The other end of the thirteenth resistor R13 is electrically connected to the gate of the first MOS transistor M1 and the collector of the eighth transistor Q8 respectively. The base of the eighth transistor Q8 is electrically connected to one end of a sixteenth resistor R16. The other end of the sixteenth resistor R16 is electrically connected to the P5.5 port of the main control unit (2). The emitter of the eighth transistor Q8 and the boost chip U4 are electrically connected to the collector of the eighth transistor Q8. Pin 2 of U4 is grounded; the other end of the second inductor L2 is electrically connected to pin 1 of the boost chip U4 and the anode of the third diode D3 respectively; the cathode of the third diode D3 is electrically connected to one end of the nineteenth resistor R19, one end of the seventh capacitor C7 and one end of the eighth capacitor C8 respectively; the other end of the nineteenth resistor R19 is electrically connected to one end of the eleventh capacitor C11, pin 3 of the boost chip U4 and one end of the twenty-first resistor R21 respectively; the other end of the seventh capacitor C7 is electrically connected to the other end of the eleventh capacitor C11, the other end of the twenty-first resistor R21 and the ground wire respectively; the other end of the eighth capacitor C8 is grounded; the cathode of the third diode D3 serves as the output end of the +20V power supply; the +4.2V power supply is the positive output end of the battery; The charging module comprises a charging chip U2 and a voltage regulator tube ED1, wherein the TEMP pin and the GND pin of the charging chip U2 are both grounded, the PROG pin is electrically connected to one end of a seventeenth resistor R17, and the other end of the seventeenth resistor R17 is grounded; the VCC pin and the CE pin of the charging chip U2 are both electrically connected to a +5V charging voltage input terminal; the / CHRG pin of the charging chip U2 is electrically connected to a P5.3 port of a main control unit (2); the / STDBY pin of the charging chip U2 is electrically connected to one end of a tenth capacitor C10, one end of the voltage regulator tube ED1 and a ground wire respectively, and the BAT pin of the charging chip U2 is electrically connected to the other end of the tenth capacitor C10, the other end of the voltage regulator tube ED1 and a positive output terminal of a storage battery respectively; The input end of the LDO module is electrically connected to the positive output end of the battery, the output end of the LDO module outputs a +3V power supply, the output end of the LDO module is also electrically connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded; The power detection module comprises a third resistor R3 and a fourth resistor R4, one end of the third resistor R3 is electrically connected to the positive output end of the battery, the other end of the third resistor R3 is electrically connected to the P5.0 port of the main control unit (2) and one end of the fourth resistor R4, and the other end of the fourth resistor R4 is grounded.

Images