Skin color detection method and apparatus

Abstract

This application provides a skin color detection method and apparatus for use in a laser hair removal device. The laser hair removal device includes a control board and a treatment head. The treatment head contains a contact sensor and a skin color detection component. The light outlet of the treatment head has a skin color detection window and a contact detection part arranged circumferentially. The light outlet, skin color detection window, and contact detection part of the treatment head are arranged on a common end face. The method includes: the control board acquiring a contact signal collected by the contact sensor through the contact detection part, and determining whether the light outlet of the treatment head is in contact with the skin based on the contact signal; after determining that the light outlet of the treatment head is in contact with the skin, the control board controls the skin color detection component to collect the skin color signal through the skin color detection window, and determines the skin color type based on the skin color signal. The technical solution of this application provides high accuracy in determining the skin color type, and the control parameters determined according to the user's skin color also match the user's skin color, resulting in stable hair removal effect without skin damage.

Description

Technical Field

[0001] This application relates to the field of skin color analysis technology for medical devices, and more particularly to a skin color detection method and apparatus. Background Technology

[0002] In recent years, with economic development, people have paid increasing attention to their appearance, including the care of their skin and hair. Correspondingly, various hair regrowth and hair removal products have emerged. In particular, for those seeking long-term hair removal, laser hair removal has gradually become the preferred choice due to its advantages such as high efficiency, long-lasting results, safety, and comfort. The instrument used for laser hair removal is the laser hair removal device. Based on the theory of selective photothermolysis discovered by R. Rox Anderson and John Albert Parrish et al. in 1983, laser hair removal devices use specific wavelengths of laser light that are preferentially absorbed by the melanin in the hair follicle structure to irradiate the skin. This causes the melanin in the hair follicle structure to absorb the laser light, destroying the follicle while avoiding damage to surrounding skin tissue, thus achieving permanent hair removal.

[0003] When using laser hair removal devices, the varying melanin content in the skin of different skin tones affects the absorption of laser light by the melanin in the hair follicle structure. Furthermore, darker skin absorbs more laser light at the surface, increasing the risk of burns. Therefore, different control parameters must be tailored to different skin tones. Existing technologies incorporate skin tone detection components in the treatment head of laser hair removal devices to automatically identify the user's skin tone and determine the appropriate control parameters for hair removal.

[0004] However, the inventors discovered in the process of realizing this application that when the operator uses the skin color detection component to perform skin color recognition, the distance and angle between the treatment head and the skin are not fixed each time the skin color is recognized, resulting in inconsistent skin color sampling conditions. This ultimately leads to poor skin color recognition accuracy, high misjudgment rate, and problems such as skin damage or poor hair removal effect. Summary of the Invention

[0005] The embodiments of this application are intended to at least partially solve one of the technical problems in the related art.

[0006] Therefore, this application discloses a skin color detection method and apparatus.

[0007] In a first aspect, embodiments of this application provide a skin color detection method applied to a laser hair removal device. The laser hair removal device includes a control board and a treatment head. A contact sensor and a skin color detection component are disposed within the treatment head. A skin color detection window and a contact detection part are circumferentially arranged at the light outlet of the treatment head, and the light outlet, the skin color detection window, and the contact detection part of the treatment head are arranged on a common end face. The method includes: The control board acquires the contact signal collected by the contact sensor through the contact detection unit, and determines whether the light outlet of the treatment head is in contact with the skin based on the contact signal; After the control board determines that the light outlet of the treatment head is in contact with the skin, it controls the skin color detection component to collect the skin color signal through the skin color detection window and determine the skin color type based on the skin color signal.

[0008] In a second aspect, embodiments of this application also disclose a skin color detection device applied to a laser hair removal device. The laser hair removal device includes a control board and a treatment head. A contact sensor and a skin color detection component are disposed inside the treatment head. A skin color detection window and a contact detection part are circumferentially disposed at the light outlet of the treatment head, and the light outlet, the skin color detection window, and the contact detection part of the treatment head are arranged on a common end face. The device includes: The contact determination unit is used to acquire the contact signal collected by the contact sensor through the contact detection unit, and determine whether the light outlet of the treatment head is in contact with the skin based on the contact signal. The skin color type determination unit is used to determine the skin color type by controlling the skin color detection component to collect the skin color signal through the skin color detection window after the light outlet of the treatment head is in contact with the skin.

[0009] The beneficial effects of the embodiments of this application are as follows: This application provides a skin color detection method and apparatus applied to a laser hair removal device. The laser hair removal device includes a control board and a treatment head. A contact sensor and a skin color detection component are disposed within the treatment head. A skin color detection window and a contact detection part are circumferentially arranged at the light outlet of the treatment head, and the light outlet, skin color detection window, and contact detection part of the treatment head are arranged on a common end face. The method includes: the control board acquiring a contact signal collected by the contact sensor through the contact detection part, and determining whether the light outlet of the treatment head is in contact with the skin based on the contact signal; after determining that the light outlet of the treatment head is in contact with the skin, the control board controls the skin color detection component to collect the skin color signal of the skin through the skin color detection window, and determines the skin color type based on the skin color signal. The technical solution of this application embodiment has a common end face arrangement for the light outlet, skin color detection window and contact detection part of the treatment head, and the control board controls the skin color detection component to collect the skin color signal through the skin color detection window only after determining that the light outlet of the laser hair removal device treatment head is in contact with the skin. Therefore, the distance and angle between the treatment head and the skin are relatively fixed each time skin color is identified, the skin color sampling conditions are consistent, the final determined skin color type is highly accurate, and the control parameters determined according to the user's skin color also match the user's skin color. The hair removal effect is stable and does not damage the skin. Attached Figure Description

[0010] Figure 1 A schematic flowchart of a skin color detection method provided in an embodiment of this application; Figure 2 A schematic flowchart illustrating another skin color detection method provided in an embodiment of this application; Figure 3 This application provides an illustration of test results for red light intensity values ​​under different skin tones in an embodiment of the present application. Figure 4 This is a schematic diagram of a skin color detection device provided in an embodiment of this application. Detailed Implementation

[0011] To better understand the above-mentioned objectives, features, and advantages of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the technical concept of the embodiments of this application are within the scope of protection of this application.

[0012] For ease of understanding, the technical concept of the embodiments of this application will be described first. As mentioned in the background art, in the prior art, when an operator uses a skin color detection component to perform skin color recognition, the distance and angle between the treatment head and the skin are not fixed each time skin color recognition is performed, resulting in inconsistent skin color sampling conditions. This ultimately leads to poor skin color recognition accuracy, high misjudgment rate, and problems such as skin damage or poor hair removal effect.

[0013] To address this issue, the applicant proposes a skin color detection method applied to a laser hair removal device comprising a control board and a treatment head. The treatment head includes a contact sensor and a skin color detection component. The light outlet of the treatment head has a skin color detection window and a contact detection section circumferentially arranged, and the light outlet, skin color detection window, and contact detection section are arranged on a common end face. The skin color detection method includes: the control board acquiring a contact signal collected by the contact sensor through the contact detection section, and determining whether the light outlet of the treatment head is in contact with the skin based on the contact signal; after determining that the light outlet of the treatment head is in contact with the skin, the control board controls the skin color detection component to collect the skin color signal through the skin color detection window, and determines the skin color type based on the skin color signal. In this embodiment, since the light outlet, skin color detection window, and contact detection part of the treatment head are arranged on the same end face, and the control board only controls the skin color detection component to collect the skin color signal through the skin color detection window after determining that the light outlet of the laser hair removal device treatment head is in contact with the skin, the distance and angle between the treatment head and the skin are relatively fixed each time skin color is identified, the skin color sampling conditions are consistent, the final determined skin color type is highly accurate, and the control parameters determined according to the user's skin color also match the user's skin color, resulting in stable hair removal effect without damaging the skin.

[0014] The embodiments of this application will now be described in more detail with reference to the accompanying drawings.

[0015] See Figure 1 The diagram shown is a flowchart illustrating a skin color detection method disclosed in an embodiment of this application.

[0016] Furthermore, Figure 1 The skin color detection method shown is applied to a laser hair removal device. This device includes a control board and a treatment head. In practical applications, the following steps are performed... Figure 1 The laser hair removal device using the skin color detection method shown can be a portable home-use laser hair removal device or a commercial laser hair removal device. For home-use laser hair removal devices, the control board and treatment head are integrated into one unit; for commercial laser hair removal devices, the control board is located in the main unit, and the treatment head is located in the treatment handle connected to the main unit.

[0017] Specifically, the treatment head contains a contact sensor and a skin color detection component. The contact sensor can be a capacitive touch sensor, an infrared photoelectric sensor, or other sensor capable of skin contact detection. The skin color detection component includes an LED light and a skin color sensor. The LED light provides illumination for the skin color sensor to perform skin color detection. The skin color sensor, used for skin color recognition, can be a brightness sensor, an RGB sensor, etc.

[0018] Furthermore, the treatment head has a skin color detection window and a contact detection part arranged circumferentially around the light outlet, and the light outlet, skin color detection window, and contact detection part are arranged on a common end face. When the contact sensor is a capacitive contact sensor, the contact detection part takes the form of a contact sensing plate. Generally, the contact sensing plate is arranged circumferentially around the light outlet, and the skin color detection window is arranged on the contact sensing plate, or circumferentially around the contact sensing plate. When the contact sensor is an infrared photoelectric sensor, the contact detection part is a detection window. This detection window allows infrared light reflected from the user's skin to enter the infrared photoelectric sensor. The infrared light reflected from the user's skin is emitted by the infrared emitting diode in the infrared photoelectric sensor and then reflected back onto the user's skin. Generally, the skin color detection window and the detection window of the contact detection part are arranged circumferentially around the light outlet, and are generally located on both sides or diagonally opposite the light outlet. The common end face arrangement of the light outlet, skin color detection window, and contact detection part of the treatment head means that the light outlet, skin color detection window, and contact detection part are located on the front mounting plane of the treatment head and are flush with each other. The purpose of this design is to ensure good contact between the front mounting surface of the treatment head and the skin. Specifically, when the light outlet, skin color detection window, and contact detection unit are all in good contact with the user's skin, the control board can identify the contact signal collected by the contact sensor through the contact detection unit. Conversely, when the front mounting surface of the treatment head is still some distance from the user's skin and not in contact, or when the front mounting surface of the treatment head is tilted at a certain angle to the user's skin, the contact signal collected by the contact sensor, whether a capacitive signal (corresponding to a capacitive contact sensor) or a light signal (corresponding to an infrared photoelectric sensor), will differ significantly from the good contact signal when there is good contact with the user's skin due to the influence of contact area (corresponding to a capacitive contact sensor) or ambient light (corresponding to an infrared photoelectric sensor).

[0019] It should be noted that some existing laser hair removal devices already integrate contact sensors and skin color detection components into their treatment heads. However, the contact sensor design is for safety reasons; specifically, when it detects that the treatment head is not in contact with the user's skin, the control board stops outputting laser light to avoid accidental injury. For such laser hair removal devices, if the light outlet, skin color detection window, and contact detection part of the treatment head are arranged on a common end face, the improvement of the skin color detection method in this application embodiment lies in the software control algorithm. If the light outlet, skin color detection window, and contact detection part of the treatment head are not arranged on a common end face, then they must first be arranged on a common end face. In cases where the contact sensor and skin color detection component are not integrated into the treatment head, when executing the skin color detection method of this application embodiment, the contact sensor and skin color detection component need to be integrated into the treatment head, and the light outlet, skin color detection window, and contact detection part of the treatment head need to be arranged on a common end face. For commercial laser hair removal devices, the embodiments of this application do not involve changes to the main unit structure and circuitry, nor do they involve changes to the connection method between the main unit and the treatment handpiece. They only involve changes to the treatment head when the contact sensor and skin color detection component are not integrated into the treatment head.

[0020] The skin color detection method of this application embodiment will be described below. See also Figure 1 As shown, the skin color detection method in this application includes: In step S101, the control board acquires the contact signal collected by the contact sensor through the contact detection unit, and determines whether the light outlet of the treatment head is in contact with the skin based on the contact signal.

[0021] Specifically, the contact sensor sends the contact signal collected by the contact detection unit to the control board, which then acquires the contact signal. Further, the control board compares the contact signal with a calibration signal when the skin is in contact, or compares the contact signal with the difference signal between the calibrated signals before and after skin contact, to determine whether the light outlet of the treatment head is in contact with the skin. For example, taking a capacitive contact sensor, since the capacitance is small when the skin is not in contact, but increases rapidly when the skin is in contact, a voltage threshold that can distinguish the skin contact state can be determined through calibration. When the contact signal is greater than this voltage threshold, it is determined that the light outlet of the treatment head is in contact with the skin.

[0022] In practical applications, the contact signal is a voltage signal. When the contact sensor is an infrared photoelectric sensor, it converts the collected light signal into a voltage signal and provides it to the control board. When the contact sensor is a capacitive contact sensor, it converts the collected capacitance signal into a voltage signal and provides it to the control board.

[0023] In step S102, after the control board determines that the light outlet of the treatment head is in contact with the skin, it controls the skin color detection component to collect the skin color signal through the skin color detection window and determine the skin color type based on the skin color signal.

[0024] Specifically, after the control board determines that the light outlet of the treatment head is in contact with the skin, it controls the LED light in the skin color detection component to illuminate. Then, the control board acquires the skin color signal of the skin through the skin color detection window when the LED light is illuminated. Further, the control board determines the final skin color type based on the skin color signal and preset rules. The preset rules represent the correspondence between the skin color signal and the skin color type. These preset rules can be existing rules for determining skin color type based on skin color signals, or they can be the implementation method for determining skin color type based on skin color signals in subsequent embodiments of this application. The skin color classification method is an existing skin color classification method, such as the Fitzpatrick-Pathak skin classification method.

[0025] It is important to note that when the skin color detection component acquires the skin color signal through the skin color detection window, it must be ensured that the light outlet of the treatment head remains in constant contact with the skin. If the controller determines that the light outlet of the treatment head is not in contact with the skin and the skin color signal acquisition is incomplete, it will stop acquiring the skin color signal and will not determine the skin color type based on the signal. In other words, once the control board determines that the light outlet of the treatment head is in contact with the skin, it controls the skin color detection component to acquire the skin color signal through the skin color detection window while the light outlet of the treatment head remains in constant contact with the skin.

[0026] Obviously, if the control panel determines that the light outlet of the treatment head is not in contact with the skin, then skin color detection should be disabled.

[0027] This application provides a skin color detection method applied to a laser hair removal device. The laser hair removal device includes a control board and a treatment head. The treatment head contains a contact sensor and a skin color detection component. The light outlet of the treatment head has a skin color detection window and a contact detection part arranged circumferentially, and the light outlet, skin color detection window, and contact detection part of the treatment head are arranged on a common end face. The method includes: the control board acquiring a contact signal collected by the contact sensor through the contact detection part, and determining whether the light outlet of the treatment head is in contact with the skin based on the contact signal; after determining that the light outlet of the treatment head is in contact with the skin, the control board controls the skin color detection component to collect the skin color signal of the skin through the skin color detection window, and determines the skin color type based on the skin color signal. The technical solution of this application embodiment has a common end face arrangement for the light outlet, skin color detection window and contact detection part of the treatment head, and the control board controls the skin color detection component to collect the skin color signal through the skin color detection window only after determining that the light outlet of the laser hair removal device treatment head is in contact with the skin. Therefore, the distance and angle between the treatment head and the skin are relatively fixed each time skin color is identified, the skin color sampling conditions are consistent, the final determined skin color type is highly accurate, and the control parameters determined according to the user's skin color also match the user's skin color. The hair removal effect is stable and does not damage the skin.

[0028] Furthermore, when a capacitive contact sensor is used, the capacitive signal is easily affected by skin variations such as humidity and static electricity, as well as environmental temperature and humidity. In particular, for high-power commercial laser hair removal devices, it is also susceptible to electromagnetic interference signals such as pre-ignition and water cooling, leading to a high probability of misjudgment in the contact detection results. When an infrared photoelectric sensor is used, it is easily affected by ambient light. Therefore, in one specific embodiment of this application, the skin color detection component includes a first LED light and a brightness sensor. The contact sensor is a first infrared photoelectric sensor, the brightness sensor is positioned corresponding to the skin color detection window, and the first infrared photoelectric sensor is positioned corresponding to the contact detection unit. The first LED light is an LED light capable of emitting red, green, and blue light. The purpose of positioning the brightness sensor corresponding to the skin color detection window and the first infrared photoelectric sensor corresponding to the contact detection unit is that the brightness sensor can collect the brightness value collected through the skin color detection window, and the first infrared photoelectric sensor can collect the infrared light reflected from the user's skin through the detection window.

[0029] Further, see Figure 2 As shown, the steps of the control board acquiring the contact signal collected by the contact sensor through the contact detection unit, and determining whether the light outlet of the treatment head is in contact with the skin based on the contact signal include: In step S201, the control board acquires the first brightness value collected by the brightness sensor through the skin color detection window in real time. When the first brightness value is greater than the first brightness threshold, it acquires the first reference signal value collected by the first infrared photoelectric sensor through the contact detection unit.

[0030] It should be noted that when the brightness sensor acquires the first brightness value through the skin color detection window, the first LED should be in the off state to prevent the light from the first LED from entering the brightness sensor and affecting its acquisition of ambient light. The control board compares the real-time acquired first brightness value with a first brightness threshold. When the first brightness value is greater than the first brightness threshold, it indicates that the light outlet of the treatment head is in a non-contact state with the skin. The first brightness threshold can be obtained through calibration or is an empirical value, and should ensure that the light outlet of the treatment head is in a non-contact state with the skin when the first brightness value is greater than the first brightness threshold.

[0031] Furthermore, when the control board acquires a non-contact state between the light outlet of the treatment head and the skin, the first infrared photoelectric sensor collects a first reference signal value through the contact detection unit, which is also the first reference signal value collected by the first infrared photoelectric sensor through the detection window. This first reference signal value serves as part of the contact signal.

[0032] In step S202, the control board periodically acquires the first feature signal value collected by the first infrared photoelectric sensor through the contact detection unit according to the first cycle.

[0033] Specifically, after acquiring the first reference signal value, the control board begins to periodically acquire the first characteristic signal value collected by the first infrared photoelectric sensor through the contact detection unit at a first cycle. Generally, the first cycle is on the order of milliseconds, for example, between 1 ms and 10 ms, so that the control board can promptly confirm that the light outlet of the treatment head is in contact with the skin. The first characteristic signal value serves as another part of the contact signal.

[0034] In step S203, the control board calculates the first difference between the first reference signal value and the first feature signal value. When the first difference is greater than or equal to the first preset threshold, it determines that the light outlet of the treatment head is in contact with the skin.

[0035] Specifically, after acquiring a first characteristic signal value, the control board calculates a first difference between the first reference signal value and the first characteristic signal value. When the contact detection unit (i.e., the detection window) contacts the user's skin, the receiving tube of the first infrared photoelectric sensor receives the infrared light reflected from the user's skin, thus increasing the conductivity of the receiving tube and correspondingly decreasing the first characteristic signal value, i.e., the voltage signal. Therefore, the control board can confirm whether the light outlet of the treatment head is in contact with the skin based on the decrease in the first characteristic signal value relative to the first reference signal value, i.e., the first difference.

[0036] The reason why the control board determines whether the light outlet of the treatment head is in contact with the skin based on the first difference is that, due to factors such as ambient light and significant differences in infrared light reflected by different skin tones, especially in dark environments with dark skin, the infrared light reflected by the user's skin is very weak. Therefore, it is difficult to determine a threshold that simultaneously adapts to different skin tones for the control board to determine skin contact. In implementing this embodiment, the inventors discovered that, although skin tone and ambient light have influences, the voltage difference between the light outlet of the treatment head and the skin in non-contact and contact states can be measured. For example, using the applicant's self-developed laser hair removal device, the inventors found that under various conditions, this voltage difference can be maintained at 0.2V or higher. That is, when the first difference between the first reference signal value and the first characteristic signal value reaches 0.2V or higher, it can be determined that the light outlet of the treatment head is in contact with the skin. In other words, the design using the first difference factor incorporates the first reference signal value of the treatment head's light outlet being in a non-contact state with the skin into the determination of skin contact. This effectively accounts for the influence of ambient light on the measurement results, overcomes the impact of ambient light on the infrared photoelectric sensor, and improves the accuracy of the determination of the contact state between the treatment head's light outlet and the skin. Obviously, in practical applications, the first preset threshold is not necessarily 0.2V and can be determined through calibration using a specific laser hair removal device.

[0037] Accordingly, the steps of the control panel controlling the skin color detection component to acquire skin color signals through the skin color detection window and determining the skin color type based on the skin color signals include: In step S204, the control board controls the first LED to light up red, green and blue light in a preset order, and uses a brightness sensor to collect the brightness values ​​of the skin under different colored light through the skin color detection window, and determines the skin color type based on the brightness values ​​under different colored light.

[0038] Specifically, the preset sequence is a pre-defined order in which different colors of the first LED light illuminate. This sequence can be set at the factory. Furthermore, to achieve the acquisition of brightness values ​​under different colored light, the illumination time of each color light should meet the brightness acquisition requirements. Additionally, to avoid mutual interference between different colored lights, there should be a certain time interval between switching between different colors, typically several milliseconds. Through this process, the control board acquires the brightness values ​​under red light, green light, and blue light. Then, based on these three brightness values, the skin tone type is determined.

[0039] In this specific embodiment, the control board determines whether the light outlet of the treatment head is in contact with the skin based on the first difference between the first reference signal value and the first characteristic signal value collected by the first infrared photoelectric sensor. By employing an infrared photoelectric sensor and incorporating the first reference signal value to account for the influence of ambient light, the accuracy of the determination of the contact status between the light outlet of the treatment head and the skin is improved.

[0040] Furthermore, in practical applications, the control board can determine the skin color type based on the brightness value under different colored light in different ways.

[0041] For example, in one specific embodiment of this application, the control panel determining the skin color type based on the brightness values ​​under different colored light illumination may include: The control panel determines the skin tone type based on the brightness values ​​under different colored lighting and a first preset correspondence. The first preset correspondence is a functional relationship between different color brightness value ranges and skin tone types.

[0042] Specifically, in the first preset correspondence, each skin tone type corresponds to a brightness value range under red light, a brightness value range under green light, and a brightness value range under blue light. When the control board obtains that the brightness values ​​under red light, green light, and blue light are all within the brightness value range corresponding to a certain skin tone type, it determines "a certain skin tone type" as the final determined skin tone type.

[0043] For example, in one specific embodiment of this application, the control panel determining the skin color type based on the brightness values ​​under different colored light illumination may include: The control panel calculates the absolute value of the difference between the brightness value under different colored lighting and the corresponding brightness calibration value under each skin color type, and sums them up. The skin color type with the smallest sum is determined as the skin color type.

[0044] Specifically, in practical applications, the brightness calibration values ​​for each skin tone type are generally the brightness values ​​of a standard skin tone color chart collected under different colored light illuminations (the same as the first LED light) for each skin tone type. Each skin tone type includes red, green, and blue brightness calibration values. For each skin tone type, the control board calculates the absolute value of the difference between the red brightness value collected by the brightness sensor through the skin tone detection window under red light and the red brightness calibration value for that skin tone type; the absolute value of the difference between the green brightness value under green light and the green brightness calibration value for that skin tone type; and the absolute value of the difference between the blue brightness value under blue light and the blue brightness calibration value for that skin tone type. These three absolute values ​​are then summed. Based on this, the sum values ​​for different skin tone types are compared, and the skin tone type with the smallest sum value is determined as the skin tone type.

[0045] Furthermore, in the process of determining skin color type based on the correspondence between brightness values ​​under different colored light and a first preset relationship, the inventors discovered that in some cases, the brightness values ​​obtained by the control board under red light, green light, and blue light are not all within the brightness value range corresponding to a certain skin color type, making it difficult to directly determine the skin color type. Simultaneously, the inventors also discovered that... (See also...) Figure 3 As shown in the table, in cases where it is difficult to determine the skin color type based on the brightness values ​​under different colored light and the first preset correspondence, the brightness values ​​under red light are all within the corresponding red brightness value range.

[0046] Specifically, Figure 3 Different standard skin tone color charts were used in various working environments, and the measurement results showed that the red brightness values ​​were all within the corresponding red brightness value range. Among them, Figure 3 The test results were obtained using the Fitzpatrick-Pathak skin typing method. Type I corresponds to a red luminance value range of ≥44000; Type II corresponds to a red luminance value range of 33000 ≤ red luminance < 44000; Type III corresponds to a red luminance value range of 28000 ≤ red luminance < 33000; Type IV corresponds to a red luminance value range of 22000 ≤ red luminance < 28000; Type V corresponds to a red luminance value range of 16500 ≤ red luminance < 22000; and Type VI corresponds to a red luminance value range of < 16500. It can be seen that the luminance values ​​under red light illumination in each working scenario fall within the corresponding red luminance value range. Different working scenarios correspond to different laser treatment devices or different treatment heads.

[0047] Therefore, in one specific embodiment of this application, the skin color detection method of this application may further include: If the control panel cannot determine the skin color type based on the brightness value under different colored light and the first preset correspondence, it determines the skin color type based on the brightness value under red light and the second preset correspondence; the second preset correspondence is a functional relationship between the range of red light brightness values ​​and the skin color type.

[0048] It is obvious that the range of red light brightness values ​​corresponding to each skin tone type in the second preset relationship is the same as the range of red light brightness values ​​corresponding to each skin tone type in the first preset relationship.

[0049] In this specific embodiment, for situations where it is difficult to determine the skin color type based on the brightness value under different colored light and the first preset correspondence, the control board determines the skin color type based on the brightness value under red light and the second preset correspondence, thus avoiding skin color classification failure.

[0050] Furthermore, considering that directly determining the control parameters of a laser hair removal device based on skin tone type lacks sufficient matching accuracy with the user's actual skin, in one specific embodiment of this application, the skin tone detection method may further include: The control panel calculates the second difference between the brightness value under different colored lighting and the brightness calibration value corresponding to the determined skin color type; The control panel determines the control parameters of the laser hair removal device based on the second difference and the determined skin color type.

[0051] Specifically, the brightness calibration value corresponding to the determined skin tone type is the brightness value of a standard skin tone color card collected under the same but different colored light as the first LED light, including red brightness calibration values, green brightness calibration values, and blue brightness calibration values. The control board calculates the difference between the red brightness value and the red brightness calibration value of the skin under red light, the difference between the green brightness value and the green brightness calibration value under green light, and the difference between the blue brightness value and the blue brightness calibration value under blue light, all collected by the brightness sensor through the skin tone detection window. These three differences are collectively referred to as the second difference value.

[0052] Generally, a dataset including the control parameters of the matched laser hair removal device, the second difference, and the skin color type is obtained through testing. The data in the dataset are fitted to obtain the functional relationship between the control parameters of the laser hair removal device, the second difference, and the skin color type. The control board determines the control parameters of the laser hair removal device based on the second difference, the determined skin color type, and the functional relationship.

[0053] In this specific implementation, considering that the control parameters of laser hair removal devices, which are usually determined based on skin color type, may have a mismatch with the user's actual skin due to their correspondence with standard skin color, the control parameters of the laser hair removal device are determined by calculating the second difference between the brightness value under different colored light and the brightness calibration value corresponding to the determined skin color type. This takes into account the difference between the user's actual skin and the standard skin color, and the final control parameters are better matched with the user's actual skin, thus achieving a better hair removal effect.

[0054] Furthermore, the inventors discovered that for individuals with particularly dark skin, there may be a situation where, even when the light outlet of the treatment head is actually in contact with the skin, the first difference calculated by the control board is still less than the first preset threshold. In other words, the control board, through the first infrared photoelectric sensor, has difficulty identifying that the light outlet of the treatment head is in contact with the skin. Therefore, in one specific embodiment of this application, the skin color detection method of this application may further include: When the first difference calculated N times consecutively is less than the first preset threshold, the control board acquires the second brightness value collected by the brightness sensor through the skin color detection window. When the second brightness value is less than the second brightness threshold, it determines that the light outlet of the treatment head is in contact with the skin.

[0055] The value of N should be determined comprehensively, taking into account factors such as the length of the first cycle and the timely identification of the light outlet of the treatment head in contact with the skin. It is usually an empirical value, for example, N = 80. The second brightness threshold can be determined based on the brightness value measured by the brightness sensor under conditions where the light outlet of the treatment head is in contact with skin of different skin tones. Obviously, the second brightness threshold should be less than or equal to the minimum brightness value measured under different conditions. Furthermore, when the control board acquires the second brightness value collected by the brightness sensor through the skin tone detection window, the first LED should be in the off state.

[0056] It should be noted that in this scenario, the first infrared photoelectric sensor is actually in a malfunctioning state. When the control board controls the skin color detection component to collect skin color signals through the skin color detection window, the light outlet of the treatment head needs to be in continuous contact with the skin. However, once the skin color detection component starts collecting skin color signals, the first LED is lit, making it difficult for the brightness sensor to collect the second brightness value. To resolve this contradiction, when the control board determines that the light outlet of the treatment head is in contact with the skin based on the second brightness value, it is assumed by default that the light outlet of the treatment head is in continuous contact with the skin.

[0057] In this specific embodiment, even when the first infrared photoelectric sensor is in a malfunctioning state, the brightness sensor is used to determine whether the light outlet of the treatment head is in contact with the skin, ensuring the normal operation of subsequent steps such as skin color detection.

[0058] Furthermore, considering the possibility of misclassification for certain skin types, such as the occasional misclassification of Type III skin due to factors like sunburn and body hair when using the Fitzpatrick-Pathak skin typing method, the skin color detection method in one specific embodiment of this application may further include: When the skin color type is determined to be the preset type, the control board re-executes the step of controlling the first LED to light up red, green and blue light in a preset order, and using the brightness sensor to collect the brightness value of the skin under different colored light through the skin color detection window, and determining the skin color type based on the brightness value under different colored light. If the skin tone type is consistent in two determinations, the control panel will determine the corresponding skin type to output. If the control panel determines the skin tone type twice in a different way, it will prompt the operator to confirm the skin tone type.

[0059] The preset type is a skin tone type that may be misjudged. The operator can be prompted to confirm the skin tone type by displaying a pop-up window on the human-machine interface of the laser hair removal device, where the operator can select the final skin type.

[0060] In this specific implementation, for skin tone types that may be misidentified, the skin tone type is finally confirmed through two determinations. Furthermore, if the two determined skin tone types are inconsistent, the operator confirms the final skin tone type. Therefore, this specific implementation can improve the accuracy of the final determined skin tone type.

[0061] Furthermore, the inventors discovered that, even with the same laser hair removal device and treatment heads from the same batch, when the control board determines the skin tone type based on the brightness values ​​under different colored light and a first preset correspondence, the final skin tone type is inaccurate when using individual treatment heads. Through repeated experiments, the inventors found that this inconsistency in the treatment heads is the cause. Therefore, in one specific embodiment of this application, the skin tone detection method of this application may further include: The control board controls the entry into the factory test mode, and when the light outlet of the treatment head comes into contact with the skin color test tool, the brightness sensor collects the first test brightness value through the skin color detection window; The control board compares the first test brightness value with the first standard brightness value. If the first test brightness value is inconsistent with the first standard brightness value, the control parameters of the brightness sensor are adjusted until the first test brightness value is consistent with the first standard brightness value.

[0062] Specifically, in practical applications, skin tone testing tools can be standard skin tone color charts. The first standard brightness value is the brightness value of the standard skin tone color chart.

[0063] In this specific embodiment, the brightness sensor is calibrated at the factory by adjusting the control parameters of the brightness sensor, so as to ensure the accuracy of the control board in determining the skin color type based on the brightness value under different colored light and the first preset correspondence when the operator actually uses it.

[0064] Furthermore, the aforementioned first LED light sequentially illuminates red, green, and blue light in a preset order. The control board then uses a brightness sensor to collect the skin brightness values ​​under different colored lights through the skin color detection window, determining the skin color type based on these values. Alternatively, in practical applications, white LED lights can be used, but in this case, the brightness sensor needs to be replaced with an RGB sensor.

[0065] Accordingly, in one specific embodiment of this application, the skin color detection component includes a second LED and an RGB sensor. The contact sensor is a second infrared photoelectric sensor. The RGB sensor is configured corresponding to the skin color detection window, and the second infrared photoelectric sensor is configured corresponding to the contact detection unit. The second LED is a white LED. The purpose of configuring the RGB sensor corresponding to the skin color detection window and the second infrared photoelectric sensor corresponding to the contact detection unit is that the RGB sensor can collect the brightness value collected through the skin color detection window, and the second infrared photoelectric sensor can collect the infrared light reflected from the user's skin through the detection window.

[0066] Furthermore, the control board acquires the contact signal collected by the contact sensor through the contact detection unit, and determines whether the light outlet of the treatment head is in contact with the skin based on the contact signal, including: The control board acquires the third brightness value collected by the RGB sensor through the skin color detection window in real time. When the third brightness value is greater than the third brightness threshold, it acquires the second reference signal value collected by the second infrared photoelectric sensor through the contact detection unit. The control board periodically acquires the second characteristic signal value collected by the second infrared photoelectric sensor through the contact detection unit according to the second cycle; The control board calculates the third difference between the second reference signal value and the second characteristic signal value. When the third difference is greater than or equal to the second preset threshold, it determines that the light outlet of the treatment head is in contact with the skin.

[0067] It should be noted that when the RGB sensor acquires the third brightness value through the skin color detection window, the second LED should be turned off to prevent its light from entering the RGB sensor and affecting its acquisition of ambient light. The control board compares the real-time acquired third brightness value with the third brightness threshold. When the third brightness value is greater than the third brightness threshold, it indicates that the light outlet of the treatment head is in a non-contact state with the skin. Since it is an RGB sensor, the brightness values ​​it acquires include R (red brightness), G (green brightness), and B (blue brightness). In practical applications, the third brightness value can be expressed as light intensity, specifically (R value + G value + B value) / 3. The third brightness threshold can be obtained through calibration or as an empirical value, and should ensure that the light outlet of the treatment head is in a non-contact state with the skin when the third brightness value is greater than the third brightness threshold.

[0068] Furthermore, when the control board acquires the second reference signal value collected by the second infrared photoelectric sensor through the contact detection unit while the light outlet of the treatment head is in a non-contact state with the skin, this second reference signal value serves as part of the contact signal. After acquiring the second reference signal value, the control board begins periodically acquiring the second characteristic signal value collected by the second infrared photoelectric sensor through the contact detection unit at a second cycle. Generally, the second cycle is on the order of milliseconds, for example, between 1 ms and 10 ms, so that the control board can promptly confirm that the light outlet of the treatment head is in contact with the skin. The second characteristic signal value serves as another part of the contact signal.

[0069] After acquiring each second characteristic signal value, the control board calculates a third difference between the second reference signal value and the second characteristic signal value. When the contact detection unit (i.e., the detection window) contacts the user's skin, the receiver of the second infrared photoelectric sensor receives the infrared light reflected from the user's skin, thus increasing the conductivity of the receiver and correspondingly decreasing the second characteristic signal value, i.e., the voltage signal. Therefore, the control board can confirm whether the light outlet of the treatment head is in close contact with the skin based on the decrease in the second characteristic signal value relative to the second reference signal value, i.e., the third difference.

[0070] The reason the control board uses the third difference value to determine whether the light outlet of the treatment head is in contact with the skin is that, due to factors such as ambient light and significant differences in infrared light reflected by different skin tones, especially in dark environments with dark skin, the infrared light reflected by the user's skin is very weak. Therefore, it is difficult to determine a threshold value that simultaneously adapts to different skin tones for the control board to determine skin contact. In implementing this embodiment, the inventors discovered that although skin tone and ambient light have influences, the voltage difference between the light outlet of the treatment head and the skin in a non-contact and contact state can be measured. That is, by using the third difference value design, the second reference signal value of the treatment head's light outlet in a non-contact state is taken into account in the determination of skin contact state. This is equivalent to considering the influence of ambient light on the measurement results, overcoming the influence of ambient light on the infrared photoelectric sensor, and improving the accuracy of the determination of the skin contact state of the treatment head's light outlet. In practical applications, the second preset threshold value can be determined by calibration using a specific laser hair removal device.

[0071] Correspondingly, the control panel controls the skin color detection component to acquire skin color signals through the skin color detection window, and determines the skin color type based on the skin color signals, including: The control board controls the second LED to light up and uses an RGB sensor to collect the RGB values ​​of the skin through a skin color detection window, and determines the skin color type based on the RGB values.

[0072] The RGB sensor collects RGB values, including R, G, and B values, through a skin color detection window. After acquiring the RGB values, the control board determines the skin color type based on these values.

[0073] In this specific embodiment, the control board determines whether the light outlet of the treatment head is in contact with the skin based on a third difference between a second reference signal value and a second characteristic signal value collected by the second infrared photoelectric sensor. By employing an infrared photoelectric sensor and incorporating the influence of ambient light through the introduction of a second reference signal value, the accuracy of the determination of the skin contact status of the treatment head's light outlet is improved.

[0074] Furthermore, in practical applications, the control panel can determine the skin color type based on RGB values ​​in different ways.

[0075] For example, in one specific embodiment of this application, the control board determining the skin color type based on RGB values ​​may include: The control panel determines the skin tone type based on RGB values ​​and a third preset relationship. This third preset relationship is a functional relationship between the RGB value range and the skin tone type.

[0076] Specifically, in the third preset correspondence, each skin tone type corresponds to a range of red brightness values ​​(i.e., R value range) under red light illumination, a range of green brightness values ​​(i.e., G value range) under green light illumination, and a range of blue brightness values ​​(i.e., B value range) under blue light illumination. When the control board obtains that all RGB values ​​are within the brightness value range corresponding to a certain skin tone type, it determines "a certain skin tone type" as the final determined skin tone type.

[0077] For example, in one specific embodiment of this application, the control board determining the skin color type based on RGB values ​​may include: The control board calculates the absolute value of the difference between the RGB value and the corresponding RGB calibration value for each skin color type, and sums them up. The skin color type with the smallest sum is determined as the skin color type.

[0078] Specifically, in practical applications, the RGB calibration values ​​for each skin tone type are generally the brightness values ​​of a standard skin tone color chart collected under the same illumination as the second LED light, including R, G, and B calibration values. For each skin tone type, the control board calculates the absolute values ​​of the differences between the R value (collected by the RGB sensor through the skin tone detection window) and the R calibration value for that skin tone type, the absolute values ​​of the differences between the G value (collected by the RGB sensor through the skin tone detection window) and the G calibration value for that skin tone type, and the absolute values ​​of the differences between the B value (collected by the RGB sensor through the skin tone detection window) and the B calibration value for that skin tone type. These three absolute values ​​are then summed. Based on this, the sum values ​​of different skin tone types are compared, and the skin tone type with the smallest sum value is determined as the skin tone type.

[0079] Optionally, in one specific embodiment of this application, the skin color detection method of this application may further include: If the control panel cannot determine the skin color type based on the RGB values ​​and the third preset relationship, it determines the skin color type based on the R value in the RGB values ​​and the fourth preset correspondence relationship; wherein, the fourth preset correspondence relationship is a functional relationship between the R value range and the skin color type.

[0080] It is evident that the range of R values ​​for each skin tone type in the fourth preset relationship is the same as the range of R values ​​for each skin tone type in the third preset relationship.

[0081] In this specific implementation, for situations where it is difficult to determine the skin color type based on RGB values ​​and a third preset correspondence, the control board determines the skin color type based on the R value in the RGB values ​​and a fourth preset correspondence, thus avoiding skin color classification failure.

[0082] Optionally, in one specific embodiment of this application, the skin color detection method of this application may further include: The control board calculates the fourth difference between the RGB value and the brightness calibration value corresponding to the determined skin color type; The control panel determines the control parameters of the laser hair removal device based on the fourth difference and the determined skin color type.

[0083] Specifically, the brightness calibration value corresponding to the determined skin tone type is the brightness value of a standard skin tone color chart collected under the same illumination as the second LED light for that skin tone type, including the red brightness calibration value, green brightness calibration value, and blue brightness calibration value. The control board calculates the difference between the R value and the red brightness calibration value in the RGB values ​​collected by the RGB sensor through the skin tone detection window, the difference between the G value and the green brightness calibration value in the RGB values, and the difference between the B value and the blue brightness calibration value in the RGB values. These three differences are collectively referred to as the fourth difference value.

[0084] Generally, a dataset including the control parameters of the matched laser hair removal device, the fourth difference, and the skin color type is obtained through testing. The data in the dataset are fitted to obtain the functional relationship between the control parameters of the laser hair removal device, the fourth difference, and the skin color type. The control board determines the control parameters of the laser hair removal device based on the fourth difference, the determined skin color type, and the functional relationship.

[0085] In this specific implementation, considering that the control parameters of laser hair removal devices, which are usually determined based on skin color type, have a mismatch with the user's actual skin due to their correspondence with standard skin color, the control parameters of the laser hair removal device are determined by calculating the fourth difference between the RGB value and the brightness calibration value corresponding to the determined skin color type. This takes into account the difference between the user's actual skin and the standard skin color, and the final control parameters are better matched with the user's actual skin, thus achieving a better hair removal effect.

[0086] Optionally, in one specific embodiment of this application, the skin color detection method of this application may further include: when the control board obtains the fourth brightness value collected by the RGB sensor through the skin color detection window when the third difference calculated M times consecutively is less than the second preset threshold, and when the fourth brightness value is less than the fourth brightness threshold, determining that the light outlet of the treatment head is in contact with the skin.

[0087] The value of M should be determined comprehensively, taking into account factors such as the length of the second cycle and the timely identification of the light outlet of the treatment head in contact with the skin. It is usually an empirical value, for example, M = 80. The fourth brightness threshold can be determined based on the brightness value measured by the RGB sensor under conditions where the light outlet of the treatment head is in contact with skin of different skin tones. Obviously, the fourth brightness threshold should be less than or equal to the minimum brightness value measured under different conditions. Furthermore, when the control board acquires the fourth brightness value collected by the brightness sensor through the skin tone detection window, the second LED should be in the off state.

[0088] It should be noted that in this scenario, the second infrared photoelectric sensor is actually in a malfunctioning state. When the control board controls the skin color detection component to collect skin color signals through the skin color detection window, the light outlet of the treatment head needs to be in continuous contact with the skin. However, once the skin color detection component starts collecting skin color signals, the second LED is lit, making it difficult for the RGB sensor to collect brightness values. To resolve this contradiction, when the control board determines that the light outlet of the treatment head is in contact with the skin based on the fourth brightness value, it is assumed by default that the light outlet of the treatment head is in continuous contact with the skin.

[0089] In this specific implementation, even when the second infrared photoelectric sensor is in a malfunctioning state, the RGB sensor is used to determine whether the light outlet of the treatment head is in contact with the skin, ensuring the normal operation of subsequent steps such as skin color detection.

[0090] Optionally, in one specific embodiment of this application, the skin color detection method of this application may further include: The control board controls the entry into the factory test mode, and when the light outlet of the treatment head comes into contact with the skin color test tool, the RGB sensor collects the second test brightness value through the skin color detection window; The control board compares the second test brightness value with the second standard brightness value. If the second test brightness value is inconsistent with the second standard brightness value, the control parameters of the RGB sensor are adjusted until the second test brightness value is consistent with the second standard brightness value.

[0091] Specifically, in practical applications, the skin tone testing tool can be a standard skin tone color chart. The second standard brightness value is the brightness value of the standard skin tone color chart.

[0092] In this specific embodiment, the brightness sensor is calibrated at the factory by adjusting the control parameters of the brightness sensor, so as to ensure the accuracy of the control board in determining the skin color type based on the brightness value under different colored light and the first preset correspondence when the operator actually uses it.

[0093] Corresponding to the aforementioned method embodiments, this application also discloses a skin color detection device applied to a laser hair removal device. The laser hair removal device includes a control board and a treatment head. A contact sensor and a skin color detection component are disposed within the treatment head. A skin color detection window and a contact detection part are circumferentially arranged at the light outlet of the treatment head, and the light outlet, skin color detection window, and contact detection part of the treatment head are arranged on a common end face. See also... Figure 4 As shown, the skin color detection device includes: a contact fit determination unit 401 and a skin color type determination unit 402.

[0094] The contact determination unit 401 is used to acquire the contact signal collected by the contact sensor through the contact detection unit, and determine whether the light outlet of the treatment head is in contact with the skin based on the contact signal. The skin color type determination unit 402 is used to determine the skin color type after the light outlet of the treatment head is in contact with the skin, and to control the skin color detection component to collect the skin color signal of the skin through the skin color detection window and determine the skin color type based on the skin color signal.

[0095] This application provides a skin color detection device applied to a laser hair removal device. The laser hair removal device includes a control board and a treatment head. A contact sensor and a skin color detection component are disposed within the treatment head. A skin color detection window and a contact detection part are circumferentially arranged at the light outlet of the treatment head, and the light outlet, skin color detection window, and contact detection part of the treatment head are arranged on a common end face. The skin color detection device includes a contact fit determination unit and a skin color type determination unit. The contact fit determination unit is used to acquire the contact signal collected by the contact sensor through the contact detection part, and determine whether the light outlet of the treatment head is in contact with the skin based on the contact signal. The skin color type determination unit is used to control the skin color detection component to collect the skin color signal of the skin through the skin color detection window after determining that the light outlet of the treatment head is in contact with the skin, and determine the skin color type based on the skin color signal. The technical solution of this application embodiment has a common end face arrangement for the light outlet, skin color detection window and contact detection part of the treatment head, and the control board controls the skin color detection component to collect the skin color signal through the skin color detection window only after determining that the light outlet of the laser hair removal device treatment head is in contact with the skin. Therefore, the distance and angle between the treatment head and the skin are relatively fixed each time skin color is identified, the skin color sampling conditions are consistent, the final determined skin color type is highly accurate, and the control parameters determined according to the user's skin color also match the user's skin color. The hair removal effect is stable and does not damage the skin.

[0096] Optionally, in one specific embodiment of this application, the skin color detection component includes a first LED light and a brightness sensor, the contact sensor is a first infrared photoelectric sensor, the brightness sensor is set corresponding to the skin color detection window, the first infrared photoelectric sensor is set corresponding to the contact detection part, and the contact determination unit 401 is specifically used for: The brightness sensor acquires the first brightness value through the skin color detection window in real time. When the first brightness value is greater than the first brightness threshold, the first reference signal value is acquired by the first infrared photoelectric sensor through the contact detection unit. The first characteristic signal value is acquired periodically by the first infrared photoelectric sensor through the contact detection unit according to the first cycle. Calculate the first difference between the first reference signal value and the first feature signal value, and when the first difference is greater than or equal to the first preset threshold, determine that the light outlet of the treatment head is in contact with the skin. Skin color type determination unit 402 is specifically used for: The system controls the first LED to light up red, green and blue lights in a preset sequence at different times. It also uses a brightness sensor to collect the brightness values ​​of the skin under different colored lights through a skin color detection window, and determines the skin color type based on the brightness values ​​under different colored lights.

[0097] Optionally, in one specific embodiment of this application, the step of the skin color type determination unit 402 determining the skin color type based on the brightness values ​​under different colored light illumination includes: The control panel determines the skin tone type based on the brightness values ​​under different colored lighting and a first preset correspondence; wherein, the first preset correspondence is a functional relationship between the range of different color brightness values ​​and the skin tone type.

[0098] Optionally, in one specific embodiment of this application, the skin color type determination unit 402 is further configured to: In cases where the skin color type cannot be determined based on the brightness values ​​under different colored light and the first preset correspondence, the skin color type is determined based on the brightness values ​​under red light and the second preset correspondence; wherein, the second preset correspondence is a functional relationship between the range of red light brightness values ​​and the skin color type.

[0099] Optionally, in one specific embodiment of this application, Figure 4 The skin color detection device shown may further include: a first control parameter determination unit. The first control parameter determination unit is used for: Calculate the second difference between the luminance values ​​under different colored lighting and the luminance calibration values ​​corresponding to the determined skin color type; The control parameters of the laser hair removal device are determined based on the second difference and the identified skin color type.

[0100] Optionally, in one specific embodiment of this application, the step of the skin color type determination unit 402 determining the skin color type based on the brightness values ​​under different colored light illumination includes: Calculate the absolute value of the difference between the brightness value under different colored lighting and the corresponding brightness calibration value under each skin color type, and sum them up. The skin color type with the smallest sum is determined as the skin color type.

[0101] Optionally, in one specific embodiment of this application, the contact determination unit 401 is further configured to: When the first difference calculated N times in a row is less than the first preset threshold, the second brightness value collected by the brightness sensor through the skin color detection window is obtained. When the second brightness value is less than the second brightness threshold, it is determined that the light outlet of the treatment head is in contact with the skin.

[0102] Optionally, in one specific embodiment of this application, Figure 4 The skin color detection device shown may further include: a first brightness parameter calibration unit. The first brightness parameter calibration unit is used for: When the control enters the factory test mode, the brightness sensor collects the first test brightness value through the skin color test tool when the light outlet of the treatment head comes into contact with the skin color test tool. Compare the first test brightness value with the first standard brightness value. If the first test brightness value is inconsistent with the first standard brightness value, adjust the control parameters of the brightness sensor until the first test brightness value is consistent with the first standard brightness value.

[0103] Optionally, in one specific embodiment of this application, the skin color type determination unit 402 is further configured to: When the skin color type is determined to be the preset type, the process of controlling the first LED to light up red, green and blue light in a preset order and timed manner is repeated, and the brightness sensor is used to collect the brightness value of the skin under different colored light through the skin color detection window, and the skin color type is determined based on the brightness value under different colored light. If the skin tone type is consistent in two determinations, the corresponding skin type will be output. If the skin tone type is inconsistent between the two determinations, the operator will be prompted to confirm the skin tone type.

[0104] Optionally, in one specific embodiment of this application, the skin color detection component includes a second LED light and an RGB sensor, the contact sensor is a second infrared photoelectric sensor, the RGB sensor is set corresponding to the skin color detection window, the second infrared photoelectric sensor is set corresponding to the contact detection part, and the contact determination unit 401 is specifically used for: The third brightness value collected by the RGB sensor through the skin color detection window is acquired in real time. When the third brightness value is greater than the third brightness threshold, the second reference signal value collected by the second infrared photoelectric sensor through the contact detection unit is acquired. The second characteristic signal value is acquired periodically by the second infrared photoelectric sensor through the contact detection unit according to the second cycle. Calculate the third difference between the second reference signal value and the second feature signal value. When the third difference is greater than or equal to the second preset threshold, determine that the light outlet of the treatment head is in contact with the skin. Skin color type determination unit 402 is specifically used for: The control board controls the second LED to light up and uses an RGB sensor to collect the RGB values ​​of the skin through a skin color detection window, and determines the skin color type based on the RGB values.

[0105] Optionally, in one specific embodiment of this application, the step of the skin color type determination unit 402 determining the skin color type based on RGB values ​​includes: The skin color type is determined based on RGB values ​​and a third preset relationship; where the third preset relationship is a functional relationship between the range of RGB values ​​and the skin color type.

[0106] Optionally, in one specific embodiment of this application, the skin color type determination unit 402 is further configured to: If the skin color type cannot be determined based on RGB values ​​and the third preset relationship, the skin color type is determined based on the R value in the RGB values ​​and the fourth preset correspondence; wherein, the fourth preset correspondence is a functional relationship between the R value range and the skin color type.

[0107] Optionally, in one specific embodiment of this application, Figure 4 The skin color detection device shown may further include: a second control parameter determination unit. The second control parameter determination unit is used for: Calculate the fourth difference between the RGB value and the standard skin tone brightness value; The control parameters of the laser hair removal device are determined based on the fourth difference and the identified skin color type.

[0108] Optionally, in one specific embodiment of this application, the skin color type determination unit 402 determines the skin color type based on RGB values ​​in the following steps: Calculate the absolute value of the difference between the RGB value and the corresponding RGB calibration value for each skin color type, and sum them up. The skin color type with the smallest sum is determined as the skin color type.

[0109] Optionally, in one specific embodiment of this application, the contact determination unit 401 is further configured to: When the third difference calculated M times consecutively is less than the second preset threshold, the fourth brightness value collected by the RGB sensor through the skin color detection window is obtained. When the fourth brightness value is less than the fourth brightness threshold, it is determined that the light outlet of the treatment head is in contact with the skin.

[0110] Optionally, in one specific embodiment of this application, Figure 4 The skin color detection device shown may further include: a second brightness parameter calibration unit. The second brightness parameter calibration unit is used for: When the control enters the factory test mode, the RGB sensor collects the second test brightness value through the skin color test tool when the light outlet of the treatment head comes into contact with the skin color test tool. Compare the second test brightness value with the second standard brightness value. If the second test brightness value is inconsistent with the second standard brightness value, adjust the control parameters of the RGB sensor until the second test brightness value is consistent with the second standard brightness value.

[0111] In a third aspect, this application also discloses a laser hair removal device, which includes a control board and a treatment head. The treatment head is equipped with a contact sensor and a skin color detection component. The light outlet of the treatment head has a skin color detection window and a contact detection part arranged circumferentially, and the light outlet, skin color detection window, and contact detection part of the treatment head are arranged on a common end face. The control board is used to execute the skin color detection method described in any of the foregoing method embodiments.

[0112] Those skilled in the art will clearly understand that the techniques in the embodiments of this application can be implemented using software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solutions in the embodiments of this application, or the parts that contribute to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application or some parts of the embodiments.

[0113] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Where there is no conflict, the embodiments and features described herein can be combined with each other. Each embodiment focuses on the differences from other embodiments. In particular, the system and device embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0114] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0115] The embodiments described above do not constitute a limitation on the scope of protection of this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A skin color detection method, characterized in that, An application is made in a laser hair removal device, the laser hair removal device including a control board and a treatment head, the treatment head being equipped with a contact sensor and a skin color detection component, the light outlet of the treatment head being circumferentially provided with a skin color detection window and a contact detection part, and the light outlet of the treatment head, the skin color detection window, and the contact detection part being arranged on a common end face, the method including: The control board acquires the contact signal collected by the contact sensor through the contact detection unit, and determines whether the light outlet of the treatment head is in contact with the skin based on the contact signal; After the control board determines that the light outlet of the treatment head is in contact with the skin, it controls the skin color detection component to collect the skin color signal through the skin color detection window and determine the skin color type based on the skin color signal.

2. The method as described in claim 1, characterized in that, The skin color detection component includes a first LED light and a brightness sensor. The contact sensor is a first infrared photoelectric sensor. The brightness sensor is positioned corresponding to the skin color detection window, and the first infrared photoelectric sensor is positioned corresponding to the contact detection unit. The control board acquires the contact signal collected by the contact sensor through the contact detection unit and determines whether the light outlet of the treatment head is in contact with the skin based on the contact signal, including: The control board acquires the first brightness value collected by the brightness sensor through the skin color detection window in real time. When the first brightness value is greater than the first brightness threshold, it acquires the first reference signal value collected by the first infrared photoelectric sensor through the contact detection unit. The control board periodically acquires the first feature signal value collected by the first infrared photoelectric sensor through the contact detection unit according to the first cycle. The control board calculates a first difference between the first reference signal value and the first feature signal value. When the first difference is greater than or equal to a first preset threshold, it determines that the light outlet of the treatment head is in contact with the skin. The control panel controls the skin color detection component to acquire skin color signals through the skin color detection window, and determines the skin color type based on the skin color signals, including: The control board controls the first LED to light up red, green and blue light in a preset order, and uses the brightness sensor to collect the brightness values ​​of the skin under different colored light through the skin color detection window, and determines the skin color type based on the brightness values ​​under different colored light.

3. The method as described in claim 2, characterized in that, The control panel determines the skin tone type based on the brightness values ​​under different colored light illuminations, including: The control panel determines the skin color type based on the brightness values ​​under different colored light and a first preset correspondence; wherein, the first preset correspondence is a functional relationship between the range of different color brightness values ​​and the skin color type.

4. The method as described in claim 3, characterized in that, The method further includes: When the control panel cannot determine the skin color type based on the brightness value under different colored light and the first preset correspondence, it determines the skin color type based on the brightness value under red light and the second preset correspondence; wherein, the second preset correspondence is a functional relationship between the range of red light brightness values ​​and the skin color type.

5. The method as described in claim 3, characterized in that, The method further includes: The control panel calculates a second difference between the brightness value under different colored lighting and the brightness calibration value corresponding to the determined skin color type; The control panel determines the control parameters of the laser hair removal device based on the second difference and the determined skin color type.

6. The method as described in claim 2, characterized in that, The control panel determines the skin tone type based on the brightness values ​​under different colored light illuminations, including: The control board calculates the absolute value of the difference between the brightness value under different colored light and the corresponding brightness calibration value under each skin color type, and sums them up. The skin color type with the smallest sum is determined as the skin color type.

7. The method according to any one of claims 2 to 6, characterized in that, The method further includes: When the first difference calculated N times consecutively is less than the first preset threshold, the control board acquires the second brightness value collected by the brightness sensor through the skin color detection window. When the second brightness value is less than the second brightness threshold, it determines that the light outlet of the treatment head is in contact with the skin.

8. The method according to any one of claims 3 to 5, characterized in that, The method further includes: The control board controls the entry into the factory test mode, and when the light outlet of the treatment head comes into contact with the skin color test tool, the brightness sensor collects the first test brightness value through the skin color detection window; The control board compares the first test brightness value with the first standard brightness value. If the first test brightness value is inconsistent with the first standard brightness value, the control parameters of the brightness sensor are adjusted until the test brightness value is consistent with the standard brightness value.

9. The method as described in claim 1, characterized in that, The skin color detection component includes a second LED and an RGB sensor. The contact sensor is a second infrared photoelectric sensor. The RGB sensor is configured corresponding to the skin color detection window, and the second infrared photoelectric sensor is configured corresponding to the contact detection unit. The control board acquires the contact signal collected by the contact sensor through the contact detection unit, and determines whether the light outlet of the treatment head is in contact with the skin based on the contact signal, including: The control board acquires the third brightness value collected by the RGB sensor through the skin color detection window in real time. When the third brightness value is greater than the third brightness threshold, it acquires the second reference signal value collected by the second infrared photoelectric sensor through the contact detection unit. The control board periodically acquires the second characteristic signal value collected by the second infrared photoelectric sensor through the contact detection unit according to the second cycle; The control board calculates a third difference between the second reference signal value and the second feature signal value. When the third difference is greater than or equal to a second preset threshold, it determines that the light outlet of the treatment head is in contact with the skin. The control panel controls the skin color detection component to acquire skin color signals through the skin color detection window, and determines the skin color type based on the skin color signals, including: The control board controls the second LED to light up and uses the RGB sensor to collect the RGB values ​​of the skin through the skin color detection window. Based on the RGB values ​​and a third preset relationship, the skin color type is determined. The third preset relationship is a functional relationship between the RGB value range and the skin color type.

10. A skin color detection device, characterized in that, An application is made in a laser hair removal device, the laser hair removal device including a control board and a treatment head, the treatment head being equipped with a contact sensor and a skin color detection component, the light outlet of the treatment head being circumferentially provided with a skin color detection window and a contact detection part, and the light outlet of the treatment head, the skin color detection window and the contact detection part being arranged on a common end face, the device comprising: The contact determination unit is used to acquire the contact signal collected by the contact sensor through the contact detection unit, and determine whether the light outlet of the treatment head is in contact with the skin based on the contact signal. The skin color type determination unit is used to determine the skin color type by controlling the skin color detection component to collect the skin color signal through the skin color detection window after the light outlet of the treatment head is in contact with the skin.

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