A skin analyzer for face and head

Abstract

This invention provides a skin analyzer for the face and head. The inner shell has an accommodating space, one side of which is an open surface. A light shield is rotatably connected to the outer shell to open or close the open surface. When the light shield is rotated to the open position, it surrounds a space for accommodating the user's head. A light source plate is disposed on the side of the accommodating space facing the open surface. The outer shell is fitted over the inner shell, and a sandwich layer is defined between the outer and inner shells. A face image acquisition device is disposed within this sandwich layer. The light source plate has an opening for the face image acquisition device to capture images. A head-top image acquisition device is movably connected to the inner shell via a driving device. The driving device moves the head-top image acquisition device to acquire an image of the entire head and sends it to a processor. The processor uses a head hair algorithm to identify the bald areas on the head and displays them on a screen, prompting the user to use a skin analyzer pen to perform scalp skin detection on the bald areas.

Description

Technical Field

[0001] This invention relates to a beauty product, and more particularly to a skin analyzer. Background Technology

[0002] With the development of technology, people are paying more and more attention to health and beauty, and facial skin analysis is an important part of this. Quantitative analysis of skin pigmentation, acne, pores, wrinkles, texture, oiliness, skin color, UV spots, blackheads, redness sensitivity, and pigmentation issues can detect not only problems already on the skin's surface but also those hidden in the basal layer. This allows for ample time to nip these problems in the bud, providing clients with a direct and quick understanding of their skin condition and enabling more effective treatment plans and product recommendations. However, existing skin analyzers can only analyze facial skin, offering limited functionality and failing to provide targeted analysis for other areas of the head, such as the scalp. Summary of the Invention

[0003] The main technical problem to be solved by the present invention is to provide a skin analyzer for the face and head, which can perform skin analysis on the face and scalp.

[0004] To solve the above-mentioned technical problems, the present invention provides a skin analyzer for the face and head, comprising: an outer shell, an inner shell, a base, a light shield, a light source plate, a skin analyzer pen, a face image acquisition device, and a head image acquisition device.

[0005] The inner shell has an accommodating space, one side of which is an open surface; the light shield is rotatably connected to the outer shell to open or close the open surface; when the light shield is rotated to the open position, the light shield surrounds a space for accommodating the user's head; the light source plate is disposed on the side of the accommodating space facing the open surface.

[0006] The outer shell is fitted over the inner shell, and a sandwich layer is defined between the outer shell and the inner shell. The face image acquisition device is installed in the sandwich layer. The light source plate is provided with a clearance opening for the face image acquisition device to take pictures.

[0007] The top-of-the-head image acquisition device is movably connected to the inner shell via a driving device. The driving device moves the top-of-the-head image acquisition device to acquire an image of the entire top of the head and sends it to the processor. The processor identifies the hair loss area on the top of the head using a hair loss algorithm and displays it on the display screen, prompting the user to use a skin analyzer to perform scalp skin detection on the hair loss area.

[0008] In a preferred embodiment: the scalp hair algorithm includes the following steps:

[0009] 1) Use image segmentation to divide the top contour of the head in the top image acquired by the top image acquisition device;

[0010] 2) Perform hair segmentation algorithm on the top of the head within the top contour area to mark the hair loss area in the top image.

[0011] In a preferred embodiment: the balding area is highlighted in the top image by using a darker color.

[0012] In a preferred embodiment: when a user uses a skin analyzer to perform scalp skin testing on areas of hair loss, the following steps are included:

[0013] 1) Turn on the skin test pen. After the skin test pen is connected to the controller, the controller outputs a control signal to make one of the hair loss areas flash on the display screen.

[0014] 2) The skin analyzer switches between different light sources and takes images of the hair loss area under each light source;

[0015] 3) After one area is photographed, the controller outputs a control signal to remind the user to photograph the next area of ​​hair loss;

[0016] 4) Use scalp algorithm rules to perform data processing on the images of each hair area to generate a report on the health status of the scalp skin in the hair loss area.

[0017] In a preferred embodiment, the following steps are included before or after step 4:

[0018] i) The area of ​​the top of the head can be calculated using image segmentation, and the area of ​​the bald area can be obtained by removing the hair area calculated by the hair segmentation algorithm.

[0019] ii) Calculate the area ratio between the hair loss area and the top of the head. When the ratio is greater than the set value, or when the ratio of the later detection is higher than the previous detection, the processor issues a baldness warning signal.

[0020] In a preferred embodiment: the headpiece detection algorithm rules include the following steps:

[0021] 1) Use a target detection algorithm to detect hair follicles at the root of hair in the image of the hair loss area, and classify the hair follicles according to the number of hairs in the follicles: one hair in the follicle is category A, two hairs in the follicle are category B, three hairs in the follicle are category C, and four hairs in the follicle are category D.

[0022] 2) Calculate the total number of hairs in the image of the bald area and assign a score:

[0023] Num = A + 2 * B + 3 * C + 4 * D

[0024]

[0025] In a preferred embodiment: the face image acquisition device includes: a guide rail extending horizontally along the width direction of the face, a slide table movably connected to the guide rail, and a camera rotating with the slide table;

[0026] The slide table moves the camera to the first shooting position, the second shooting position, and the third shooting position along the direction of the guide rail; the second shooting position and the third shooting position are located on the left and right sides of the first shooting position, respectively; when the camera moves to the second shooting position or the third shooting position, the camera rotates relative to the slide table in the opposite direction of the slide table's movement.

[0027] In a preferred embodiment: the guide rail includes a threaded rod and a first motor for driving the threaded rod to rotate, wherein the output shaft of the first motor is engaged with a worm gear sleeved on one end of the threaded rod via a worm.

[0028] In a preferred embodiment: the slide table is rotated in coordination with a second motor and a camera.

[0029] In a preferred embodiment: the slide is L-shaped, with a threaded hole on the side of its vertical portion for the threaded rod to pass through, and the second motor is provided on the upper surface of its horizontal portion.

[0030] In a preferred embodiment: the first shooting position is a centered position, and when the camera is in the first shooting position, the angle between the central axis of the camera and the central axis of the slide is 0 degrees; when the camera moves from the first position to the left to the second shooting position, the camera rotates to the right relative to the slide by an angle α; when the camera moves from the first position to the right to the third shooting position, the camera rotates to the left relative to the slide by an angle α.

[0031] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0032] 1. This invention provides a facial and scalp skin analyzer. It acquires images of the user's scalp using a top-of-the-head image acquisition device, and processes these images through a processor to determine the areas of hair loss. A skin analyzer pen can then be used to specifically detect these areas, generating a report on the health status of the scalp skin in those areas. Because this scalp skin health report is specifically for the hair loss area, it is highly targeted. By comparing the scalp and facial skin reports, users can gain a comprehensive understanding of their scalp skin health. Combined with the dietary, exercise, and skincare recommendations provided in the report, users can further improve their skin health.

[0033] 2. This invention provides a facial and head skin analysis device. The facial image acquisition device uses a single camera. First, it captures an image from a central, first shooting position. Then, via a worm gear drive, the camera is moved to a second shooting position. Next, a second motor on the slide is activated, rotating the camera by a specific angle to capture a complete image of the left side of the face. Finally, the right side image is also captured. This allows a single camera to automatically acquire full-face image data from three angles (left, center, and right) under different light sources (white light, parallel polarized light, cross-polarized light, UV light, blue light, and brown light). The data is transmitted back to a backend database via Wi-Fi signal or using a local algorithm within an app to reconstruct a 3D facial model. Data analysis algorithms then generate a complete facial health report, analyzing dimensions such as blackheads, pores, purplish spots, acne, texture, sensitivity, wrinkles, pigmentation, and dark circles. The severity of each dimension is accurately identified at the corresponding location on the face.

[0034] 3. This invention provides a skin analyzer for the face and head. The guide rail used in the face image acquisition device is a linear guide rail, and a second motor drives the camera to rotate, so that the camera can still be aimed at the face and take pictures after moving on the linear guide rail to both sides of the face. The structure is relatively simple and easy to implement. Attached Figure Description

[0035] Figure 1 This is a perspective view of the skin analyzer in a preferred embodiment of the present invention;

[0036] Figure 2 This is a side view of the skin analyzer in a preferred embodiment of the present invention;

[0037] Figure 3 This is a front view of the skin analyzer in a preferred embodiment of the present invention;

[0038] Figure 4 This is a schematic diagram of the camera located at the first shooting position in a preferred embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of the camera being located at the second shooting position in a preferred embodiment of the present invention;

[0040] Figure 6 This is a schematic diagram showing the camera located at the third shooting position in a preferred embodiment of the present invention;

[0041] Figure 7 This is a perspective view of the face image acquisition device in a preferred embodiment of the present invention;

[0042] Figure 8 This is a front view of the face image acquisition device in a preferred embodiment of the present invention;

[0043] Figure 9This is a top view of the face image acquisition device in a preferred embodiment of the present invention;

[0044] Figure 10 This is a flowchart of the face reconstruction algorithm in a preferred embodiment of the present invention;

[0045] Figure 11 This is a flowchart illustrating the overall process of head and facial skin detection in a preferred embodiment of the present invention. Detailed Implementation

[0046] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0047] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0049] refer to Figures 1-10 This embodiment provides a skin analyzer, including: a shell 1, an inner shell 2, a base 3, a light shield 4, a light source plate 5, and a face image acquisition device 6; the base 3 is used to support the shell 1 and to place the shell 1 stably on the support surface.

[0050] The face image acquisition device 6 includes: a guide rail 61 extending horizontally along the width of the face, a slide 62 movably connected to the guide rail 61, and a camera 63 rotatably engaged with the slide 62; the slide 62 moves the camera 63 to a first shooting position, a second shooting position, and a third shooting position along the direction of extension of the guide rail 61; the second shooting position and the third shooting position are respectively located on the left and right sides of the first shooting position; when the camera 63 moves to the second shooting position or the third shooting position, the camera 63 rotates relative to the slide 62 in the opposite direction of movement of the slide 62.

[0051] The inner shell 2 has an accommodating space, one side of which is an open surface; the light shield 4 is rotatably connected to the outer shell 1 to open or close the open surface; when the light shield 4 is rotated to the open position, the light shield 4 surrounds a space for accommodating the user's head; the light source plate 5 is disposed on the side of the accommodating space facing the open surface; the outer shell 1 is fitted over the inner shell 2, and a sandwich layer is defined between the outer shell 1 and the inner shell 2, and the face image acquisition device 6 is disposed in the sandwich layer; the light source plate 5 is provided with clearance openings 51 at the portions corresponding to the first shooting position, the second shooting position, and the third shooting position, respectively.

[0052] The inner shell 2 has a forehead positioning rod 21 and a chin support 22 at the opening of the accommodating space. The forehead positioning rod 21 is connected to the top inner wall of the accommodating space, and the chin support 22 is connected to the bottom inner wall of the accommodating space. The forehead positioning rod 21 and the chin support 22 can position and support the user's head, so that the user's head remains still throughout the shooting process, ensuring that the camera 63 can capture a clear image.

[0053] When the user's head is placed in the opening of the accommodating space, opening the light shield 4 prevents external light from interfering with image acquisition and also prevents light emitted from the light source plate 5 from leaking out. The light emitted from the light source plate 5 shines on the user's face, reflects off, and enters the camera 63 through the opening, thus completing the shooting process. Since the camera 63 can move between three positions via the slide 62, it can capture images of the face from three positions: center, left, and right. Furthermore, after moving to the second and third shooting positions, the camera 63 rotates a certain angle relative to the slide 62 to ensure that the camera 63 faces the user, guaranteeing the effectiveness of image acquisition.

[0054] To assess facial issues from multiple perspectives, this embodiment incorporates various wavelengths of light on the light source plate 5, specifically white light, parallel polarized light, cross-polarized light, UV light, blue light, and brown light. Brown light reveals the degree of dryness and dehydration of the lips, used to detect lip moisture. Under UV light, brick-red fluorescent dots appear on the skin surface, used to detect porphyrins. UV light can also detect lint on the facial surface and deep-seated UV spots (sunspots). Cross-polarized light completely filters out specular reflections from the skin surface, allowing observation of diffuse reflections from deeper layers, used to detect deeper skin sensitivity and brown spots. Parallel polarized light detects surface oils and texture issues. Blue light detects and analyzes acne-causing bacteria within sebaceous glands, determining the likelihood of acne breakouts in the near future, and can also reveal skin problems invisible to the naked eye.

[0055] Specifically, the entire skin testing process is described as follows:

[0056] 1) Camera 63 is located in the central starting position, which is the first shooting position. At this time, the angle between the central axis of camera 63 and the central axis of slide 62 is 0 degrees. Camera 63 captures whether all facial features are within the frame and prompts the user to rotate left and right and swing accordingly through voice prompts. Before taking a picture, the user is reminded to close their eyes and remain still. Then, by switching different light sources, corresponding pictures of the front face are taken.

[0057] 2) The slide 62 moves the camera 63 to the left to the second shooting position. After it is in position, the camera 63 rotates 15° to the right. Then, by switching different light sources, it takes a picture of the left side of the face again. It should be noted that the rotation angle does not have to be 15°. It is just necessary to rotate the camera to make the left side of the face clearly visible in the shooting area of ​​the camera 63. The specific angle can be set arbitrarily according to the different imaging angles of the camera 63.

[0058] 3) The slide 62 moves the camera 63 to the right back to the first shooting position, and the camera 63 rotates to the left to return to its original position. The slide 62 then moves the camera 63 to the right again to the third shooting position. After reaching the position, the camera 63 rotates 15° to the left, and then, by switching different light sources, it takes another picture of the right side of the face.

[0059] 4) The slide 62 moves the camera 63 to the left to return to the first shooting position, and the camera 63 rotates to the right to return to its original position.

[0060] 5) Full-face data images collected from the left, center, and right sides are transmitted back to the backend database via WIFI signal data or using the APP's local algorithm to reconstruct a 3D face model. Data algorithm calculation and analysis generate a complete facial health report. The analysis dimensions include blackheads, pores, purplish spots, acne, texture, sensitivity, wrinkles, pigmentation, dark circles, etc., and the severe locations of each dimension are accurately marked on the corresponding positions of the face. The face can be represented in 2D or 3D.

[0061] In this embodiment, the example is taken by shooting from the first shooting position, then the second shooting position, and finally the third shooting position. However, this order should not be a limitation. In fact, there is no strict distinction between the order of shooting from these three positions. It doesn't matter which position you shoot from first, as long as you can get one frontal face image and two side face images in the end.

[0062] Specifically, step 5, reconstructing the 3D face model, includes: 1) inputting three face images into the object detection algorithm to detect the relative position of the person; 2) cropping the three face images to obtain cropped portrait images; 3) inputting the cropped portrait images into the 3D reconstruction algorithm model to obtain face point cloud data; 4) stitching the point cloud data of the three faces together; 5) running the system reconstruction and outputting 3D face data.

[0063] In this embodiment, the guide rail 61 includes a threaded rod 611 and a first motor 612 for driving the threaded rod 611 to rotate. The output shaft of the first motor 612 is connected to a worm gear 614 sleeved on one end of the threaded rod 611 via a worm 613. To achieve the rotation of the camera 63 relative to the slide table 62, the slide table 62 is connected to the camera 63 via a second motor 64.

[0064] Specifically, the slide table 62 is L-shaped, with a threaded hole on the side of its vertical part for the threaded rod 611 to pass through, and the second motor 64 is provided on the upper surface of its horizontal part.

[0065] After the above design, the threaded rod 611 and the first motor 612 are connected by a worm gear mechanism. The worm gear mechanism meshes with the worm 614 fixed on the threaded rod 611 through the worm 613 on the output shaft of the first motor. The worm gear 614 drives the threaded rod 611 to rotate, thereby moving the slide 62 on the threaded rod 611 to the left or right through the threaded thread engagement. The direction of movement of the slide 62 is controlled by the forward or reverse rotation of the first motor 612. The rotation direction of the camera 63 relative to the slide 62 is controlled by the forward or reverse rotation of the second electrode.

[0066] Furthermore, for mounting the face image acquisition device 6, a fixing seat 65 is provided at each end of the threaded rod 611 along its length. The fixing seat 65 includes lugs for connecting the guide rail 61 and platforms for the inner and outer walls. The fixing seat can be mounted on the threaded rod 611 via the lugs, and the worm gear 614 can be fixed to the side of the fixing seat 65 by tightening the lock nut, thus completing the fixation of the worm gear 614 and the fixing seat 65.

[0067] In addition to facial skin analysis, this embodiment of the skin analyzer also includes scalp skin analysis. To achieve this, a skin analyzer pen 7 and a head image acquisition device 8 are added to the existing skin analyzer. A slot 11 for accommodating the skin analyzer pen 7 is provided on the side of the outer casing 1. Furthermore, the slot 11 not only stores the skin analyzer pen 7 but also charges it.

[0068] The head image acquisition device 8 is movably connected to the inner shell via a driving device 9. The driving device 9 moves the head image acquisition device 8 to acquire an image of the entire head and sends it to the processor. The processor uses a head hair algorithm to identify the hair loss areas on the head and displays them on the screen, prompting the user to use the skin analyzer pen 7 to perform a scalp skin test on the hair loss areas. In this embodiment, the processor and screen are the processor and screen built into the user's smart terminal, such as a mobile phone, tablet, or laptop. Of course, a tablet with a screen can also be specially configured on the skin analyzer.

[0069] In this embodiment, the driving device 9 is a telescopic pole. The telescopic pole drives the image acquisition device to move back and forth above the head, so that the shooting range of the overhead image acquisition device 8 can cover the entire overhead area. Multiple images captured by the overhead image acquisition device 8 are then stitched together using an image stitching algorithm to obtain an image of the entire overhead area. The telescopic pole is manually driven, meaning that a person pulls the telescopic pole to different positions to capture the overhead image.

[0070] The scalp hair algorithm used in this embodiment includes the following steps:

[0071] 1) Use image segmentation to divide the top contour of the head in the top image acquired by the top image acquisition device 8;

[0072] 2) Perform image segmentation on the top of the head within the top contour area and mark the hair loss area in the top image.

[0073] 3) Calculate the area ratio between the balding area and the crown area;

[0074] 4) Create a scalp hair health report, highlighting the hair loss areas in the scalp image with color markings.

[0075] The detailed calculation method for step 3 is as follows:

[0076] 31) The area of ​​the top of the head can be calculated using image segmentation, and the area of ​​the bald area can be obtained by removing the hair area calculated by the hair segmentation algorithm.

[0077] 32) Calculate the area ratio between the balding area and the top of the head. When the ratio is greater than a set value, or when the ratio in a later detection is higher than that in a previous detection, the processor issues a baldness warning signal. In this embodiment, the set value is 10%, which can be modified as needed.

[0078] Furthermore, when the processor issues a baldness warning signal, the scalp hair health report will convert the baldness warning signal into text that the user can recognize to remind them, and will also provide some suggestions on diet and lifestyle based on the user's situation to alleviate and improve hair loss.

[0079] After identifying the areas of hair loss, a more detailed and targeted skin analysis of the scalp in these areas is needed to determine the cause of the user's hair loss and allow for targeted treatment. Therefore, the user needs to use the skin analyzer pen 7 to perform a scalp skin analysis on the hair loss areas, specifically including the following steps:

[0080] 1) Turn on the skin test pen 7. After the skin test pen 7 is connected to the controller, the controller outputs a control signal to make one of the hair loss areas flash on the display screen.

[0081] 2) The skin test pen 7 switches to different light sources and takes images of the hair loss area under each light source; in this embodiment, the light sources of the skin test pen 7 include white light, polarized light and UV light.

[0082] 3) After one area is photographed, the controller outputs a control signal to remind the user to photograph the next area of ​​hair loss;

[0083] 4) The scalp algorithm rules are used to process the data in the images of each hair area, generating a scalp health report for the hair loss area. Because different light sources are used to photograph the scalp in the hair loss area, the scalp health report can detect multiple indicators, such as hair loss, oiliness, keratinization, sensitivity, and hair follicle blockage. This allows users to understand the root cause of their hair loss.

[0084] The headpiece detection algorithm rules in step 4 include the following steps:

[0085] 1) Use a target detection algorithm to detect hair follicles at the root of hair in the image of the hair loss area, and classify the hair follicles according to the number of hairs in the follicles: one hair in the follicle is category A, two hairs in the follicle are category B, three hairs in the follicle are category C, and four hairs in the follicle are category D.

[0086] 2) Calculate the total number of hairs in the image of the bald area and assign a score:

[0087] Num = A + 2 * B + 3 * C + 4 * D

[0088]

[0089] In this way, each area of ​​hair loss in the user is scored using the algorithm described above, thus identifying the area with the most severe hair loss problem.

[0090] After the above process, you will receive a scalp skin health report and a facial health report. By comparing the two reports, you can obtain a relatively complete and detailed scalp skin test report. The system will automatically provide improvement plans in terms of diet, lifestyle, exercise, and skincare to improve the user's skin health.

[0091] The above description is merely a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention by those skilled in the art within the scope of the technology disclosed in the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A facial and head skin tester characterized by include: Outer shell, inner shell, base, light shield, light source plate, skin measuring pen, face image acquisition device and top image acquisition device; The inner shell has an accommodating space, one side of which is an open surface; The light shield is movably connected to the outer shell to open or close the opening surface; when the light shield is in the open position, the light shield surrounds a space for accommodating the user's head; the light source plate is disposed on the side of the accommodating space facing the opening surface; The outer shell is fitted over the inner shell, and a sandwich layer is defined between the outer shell and the inner shell. The face image acquisition device is installed in the sandwich layer. The light source plate is provided with a clearance opening for the face image acquisition device to take pictures. The top-of-the-head image acquisition device is movably connected to the inner shell via a driving device. The driving device moves the top-of-the-head image acquisition device to acquire an image of the entire top of the head and sends it to the processor. The processor identifies the hair loss area on the top of the head using a hair loss algorithm and displays it on the display screen, prompting the user to use a skin analyzer to perform scalp skin detection on the hair loss area.

2. A facial and head skin measuring apparatus according to claim 1, wherein: The scalp hair algorithm includes the following steps: 1) Use image segmentation to divide the top contour of the head in the top image acquired by the top image acquisition device; 2) Perform hair segmentation algorithm on the top of the head within the top contour area and mark the hair loss area in the top image.

3. A facial and head skin measuring apparatus according to claim 2, wherein: The bald area is highlighted in the image of the top of the head by using a darker color.

4. The facial and head skin measuring apparatus according to claim 1, wherein: When users use a skin analyzer to test their scalp and skin in areas of hair loss, the following steps are involved: 1) Turn on the skin test pen. After the skin test pen is connected to the controller, the controller outputs a control signal to make one of the hair loss areas flash on the display screen. 2) The skin analyzer switches between different light sources and takes images of the hair loss area under each light source; 3) After one area is photographed, the controller outputs a control signal to remind the user to photograph the next area of ​​hair loss; 4) Use scalp algorithm rules to perform data processing on the images of each hair area to generate a report on the health status of the scalp skin in the hair loss area.

5. A skin analyzer for the face and head according to claim 4, characterized in that: The scalp detection algorithm rules include the following steps: 1) Use an object detection algorithm to detect hair follicles at the root of hair in the image of the hair loss area, and classify the hair follicles according to the number of hairs in the follicles: one hair in the follicle is category A, two hairs in the follicle are category B, three hairs in the follicle are category C, and four hairs in the follicle are category D. 2) Calculate the total number of hairs in the image of the bald area and assign a score: Num = A + 2 * B + 3 * C + 4 * D 。 6. A skin analyzer for the face and head according to claim 4, characterized in that: The following steps may be included before or after step 4: i) The area of ​​the top of the head contour can be calculated using image segmentation, and the area of ​​the bald area can be obtained by removing the hair area calculated by the hair segmentation algorithm; ii) Calculate the area ratio between the hair loss area and the top of the head. When the ratio is greater than the set value, or when the ratio of the later detection is higher than the previous detection, the processor issues a baldness warning signal.

7. A skin analyzer for the face and head according to any one of claims 1-6, characterized in that: The face image acquisition device includes: a guide rail extending horizontally along the width of the face, a slide table movably connected to the guide rail, and a camera rotating with the slide table. The slide table moves the camera to the first shooting position, the second shooting position, and the third shooting position along the direction of the guide rail; the second shooting position and the third shooting position are located on the left and right sides of the first shooting position, respectively; when the camera moves to the second shooting position or the third shooting position, the camera rotates relative to the slide table in the opposite direction of the slide table's movement.

8. A skin analyzer for the face and head according to claim 7, characterized in that: The guide rail includes a threaded rod and a first motor for driving the threaded rod to rotate. The output shaft of the first motor is engaged with a worm gear sleeved on one end of the threaded rod via a worm.

9. A skin analyzer for the face and head according to claim 8, characterized in that: The slide table is rotated in conjunction with a second motor and a camera. The slide is L-shaped, with a threaded hole on the side of its vertical part for the threaded rod to pass through, and the second motor is provided on the upper surface of its horizontal part.

10. A skin analyzer for the face and head according to claim 7, characterized in that: The first shooting position is the center position. When the camera is in the first shooting position, the angle between the central axis of the camera and the central axis of the slide is 0 degrees. When the camera moves from the first position to the left to the second shooting position, the camera rotates to the right relative to the slide by an angle α. When the camera moves from the first position to the right to the third shooting position, the camera rotates to the left relative to the slide by an angle α.

Images