Multispectral face photographing device

Abstract

The utility model discloses a multispectral face photographing device, which comprises a base provided with a control module; the light supplementing assembly comprises a reflecting cover and light supplementing pieces, the reflecting cover is connected to the base and forms a detection cavity for containing the human face, the light supplementing pieces are installed on the inner wall of the reflecting cover and evenly distributed in the arc-shaped extending direction of the reflecting cover, and the light supplementing pieces are electrically connected with the control module and used for emitting light sources of various wavelengths; and the scanning assembly is mounted on the reflecting cover and extends into the detection cavity, and the scanning assembly is electrically connected with the control module and transmits face detection data. According to the utility model, the problem of non-uniform multi-spectral light supplement during photographing detection is solved.

Description

Technical Field

[0001] This utility model relates to the field of machine vision inspection technology, and in particular to a multispectral face imaging device. Background Technology

[0002] With the development of machine vision technology, facial skin detection devices are widely used in the medical aesthetics field, and non-contact imaging analysis of skin condition has become an industry trend. Using facial imaging devices, the skin condition of a user's face can be detected and analyzed non-contactly, allowing people to use the analysis results for appropriate skincare or targeted medical aesthetic procedures.

[0003] When in use, facial skin detection devices capture facial skin features through camera scanning and illumination supplementation, and then provide implementation suggestions in subsequent analysis. However, in the current process of facial skin imaging detection instruments, the single distribution of light source results in insufficient illumination uniformity, and the lack of multi-band spectrum switching capability makes it difficult to obtain multi-dimensional information of the skin at different wavelengths, resulting in incomplete detection results. Utility Model Content

[0004] The main purpose of this invention is to provide a multispectral face photography device, which aims to solve the problem of uneven multispectral illumination during photo detection.

[0005] To achieve the above objectives, this utility model proposes a multispectral face photography device, comprising:

[0006] The base is equipped with a control module;

[0007] The supplementary lighting assembly includes a reflector and supplementary lighting components. The reflector is connected to the base and forms a detection cavity for accommodating a human face. The supplementary lighting components are installed on the inner wall of the reflector and are evenly distributed along the arc-shaped extension direction of the reflector. The supplementary lighting components are electrically connected to the control module and are used to emit multiple wavelength light sources.

[0008] A scanning component is mounted on the reflector and extends into the detection cavity. The scanning component is electrically connected to the control module and transmits face detection data.

[0009] Optionally, the supplementary lighting component includes multiple adjustable light wave lamp panels, which are laterally spaced along the arc-shaped reflector, and each adjustable light wave lamp panel integrates multiple LED chips of different wavelengths.

[0010] Optionally, three adjustable light wave lamp panels are provided, and the perpendicular bisectors of the three adjustable light wave lamp panels intersect at a point in the detection cavity, with the included angle between the perpendicular bisectors of two adjacent adjustable light wave lamp panels being 45 degrees.

[0011] Optionally, the upper and lower parts of the reflector 21 are both arc-shaped, and the reflector 21 has a hemispherical structure.

[0012] Optionally, the inner wall of the reflector 21 is coated with a diffuse reflection coating.

[0013] Optionally, the scanning component includes a structured light projector for projecting structured light to establish three-dimensional facial information.

[0014] Optionally, the scanning component further includes a high-speed grayscale camera and a color camera, which are combined to capture facial images.

[0015] Optionally, the structured light projector, the high-speed grayscale camera, and the color camera are arranged vertically at intervals along the arc-shaped reflector and their illumination directions intersect at a point.

[0016] Optionally, the base further includes a mounting component, which has mounting holes for connecting an external bracket.

[0017] Optionally, the device also includes a housing that partially surrounds the outside of the reflector, and the scanning assembly is housed between the reflector and the housing.

[0018] The beneficial effects of this invention are as follows: it solves the problem of uneven multispectral illumination during facial skin detection when taking photos. The illumination components are evenly arranged along the arc-shaped inner wall of the reflector, enabling them to illuminate the face inside the detection cavity from multiple angles. The control module controls the illumination components to emit light sources of various wavelengths to obtain multidimensional information about the skin at different wavelengths. The reflector reflects the light sources from the illumination components, ensuring uniform illumination on the face without shadows, overexposure, or bright spots. This improves the imaging effect and makes the detection results more comprehensive when the scanning component takes photos of the face. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the multispectral face photography device of this utility model;

[0021] Figure 2 This is a schematic diagram of the first exploded structure of the multispectral face photography device of this utility model;

[0022] Figure 3 This is a schematic diagram of the second exploded structure of the multispectral face photography device of this utility model;

[0023] Figure 4 This is a cross-sectional structural diagram of the multispectral face photography device of this utility model.

[0024] Label Explanation:

[0025] 1. Base; 11. Mounting component; 111. Mounting hole; 12. Control module;

[0026] 2. Supplemental lighting assembly; 21. Reflector; 211. Detection cavity; 22. Supplemental lighting component; 221. Adjustable light wave plate;

[0027] 3. Scanning components; 31. Structured light projector; 32. High-speed grayscale camera; 33. Color camera;

[0028] 4. Shell.

[0029] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0033] One embodiment of this utility model provides a multispectral face photography device, see reference. Figures 1 to 4 ,include:

[0034] The base 1 is equipped with a control module 12; the supplementary lighting assembly 2 includes a reflector 21 and a supplementary lighting element 22. The reflector 21 is connected to the base 1 and forms a detection cavity 211 for accommodating a face. The supplementary lighting element 22 is installed on the inner wall of the reflector 21 and is evenly distributed along the arc-shaped extension direction of the reflector 21. The supplementary lighting element 22 is electrically connected to the control module 12 and is used to emit light sources of multiple wavelengths; the scanning assembly 3 is installed on the reflector 21 and extends into the detection cavity 211. The scanning assembly 3 is electrically connected to the control module 12 and transmits face scanning data.

[0035] This embodiment solves the problem of uneven multispectral illumination during facial skin detection in a face imaging device. The illumination element 22 is evenly arranged along the arc-shaped inner wall of the reflector 21, enabling it to illuminate the face within the detection cavity 211 from multiple angles. The control module 12 controls the illumination element 22 to emit light sources of various wavelengths to obtain multidimensional information about the skin at different wavelengths. The reflector 21 reflects the light source from the illumination element 22, ensuring uniform illumination on the face without shadows, overexposure, or bright spots. This improves the imaging effect and makes the detection results more comprehensive when the scanning component 3 captures images of the face. Specifically, the base 1 is located at the lower end of the illumination component 2 to support both the illumination component 2 and the scanning component 3. The base 1 contains the control module 12 and a power module, which are electrically connected to the control module 12 and supply power to the illumination element 22 and the scanning component 3.

[0036] In this embodiment, the reflector 21 is fixedly connected to the base 1. The supplementary lighting element 22 is evenly distributed along the arc-shaped inner wall of the reflector 21. The supplementary lighting element 22 illuminates the light source towards the center of the detection cavity 211. The reflector 21 reflects the light source from the supplementary lighting element 22. When the user's face enters the detection cavity 211, the light source can evenly illuminate the user's face. Compared to a light source illuminating from a single direction, the supplementary lighting element 22, in conjunction with the reflector 21, prevents shadows and concentrated light spots on the user's face, improving the detection effect. The supplementary lighting element 22 is electrically connected to the control module 12. The control module 12 controls the brightness, frequency, and switching sequence of each wavelength of the supplementary lighting element 22 and works in coordination with the scanning component 3. The scanning component 3 is fixedly connected to the reflector 21. The scanning component 3 extends into the detection cavity 211 and detects the user's face. Simultaneously, the scanning component 3 uploads the detection data to the control module 12 for subsequent analysis.

[0037] Furthermore, the supplementary lighting component 22 includes multiple adjustable light wave lamp panels 221, which are laterally spaced along the arc-shaped reflector 21. Each adjustable light wave lamp panel 221 integrates multiple LED chips of different wavelengths. The adjustable light wave lamp panels 221 can emit light sources of different wavelengths. Since the human face has a three-dimensional structure, the multiple adjustable light wave lamp panels 221 arranged laterally along the arc shape ensure that both sides of the face are illuminated by the light source. In this embodiment, each adjustable light wave lamp panel 221 integrates at least three sets of LED chip arrays of different wavelengths. Each set of LED chips is independently controlled by the control module 12, switching between different wavelength light sources as needed. Specifically, the wavelength combination can be 365nm UVA light for oil detection, 415nm blue light for pore imaging, and 530nm green light for hemoglobin detection. It is also possible to set a wavelength of 630nm red light for deep blood vessel imaging and 850nm near-infrared light for subcutaneous tissue detection on the adjustable light wave board 221. The substrate of the adjustable light wave board 221 is a thick aluminum-based PCB. The adjustable light wave board 221 is connected to the control module 12, which independently controls each LED chip group, and the interval between switching different wavelengths does not exceed 10ms. In this embodiment, multiple wavelengths are combined to obtain various features of facial skin, thereby making the detection results more accurate.

[0038] Furthermore, three adjustable light wave lamp panels 221 are provided, and the perpendicular bisectors of the three adjustable light wave lamp panels 221 intersect at a point in the detection cavity 211. The angle between the perpendicular bisectors of two adjacent adjustable light wave lamp panels 221 is 45 degrees. The three adjustable light wave lamp panels 221 are respectively located on the left, center, and right sides of the inner wall of the reflector 21, and the spacing between each adjustable light wave lamp panel 221 is equal. The three adjustable light wave lamp panels 221 are arranged radially on the inner wall of the reflector 21. In this embodiment, the distance from the center point of each adjustable light wave lamp panel 221 to the intersection of the perpendicular bisectors is 300mm ± 5mm, thereby optimizing the balance between light intensity and uniformity. This spatial position and size design can ensure that the light source can be evenly dispersed without making the entire device too large. When the distance is small, the light will not have enough space to disperse, resulting in a strong local spot on the face. When the distance is large, the light will be too dispersed, resulting in insufficient facial illumination. When the face enters the detection cavity 211, the intersection of the perpendicular bisectors coincides with the center of the human face. The angle between the perpendicular bisectors of two adjacent adjustable light wave plates 221 is 45 degrees. Since the human face is approximately a curved hemispherical shape, the light from the adjustable light wave plates 221 can uniformly cover the face from multiple angles. The three adjustable light wave plates 221 can operate in two modes: simultaneously generating light sources of the same wavelength and switching them simultaneously, thereby superimposing the light intensity and enhancing the illumination intensity of specific wavelengths. The control module 12 synchronously controls the switching to simplify the timing and reduce circuit complexity. Alternatively, the three adjustable light wave plates 221 can simultaneously emit light sources of different wavelengths, and the light from all wavelengths is mixed to illuminate the face, thus acquiring multispectral information in a single shot and improving detection efficiency.

[0039] Furthermore, the upper and lower parts of the reflector 21 both extend in an arc shape, and the reflector 21 has a hemispherical structure. The arc-shaped extension of both the upper and lower sides of the reflector 21 allows light to continue to be reflected after illuminating the upper or lower part of the detection cavity 211, and then illuminate the face, improving illumination efficiency. The reflector 21 has an approximately hemispherical structure to adapt to the three-dimensional structure of the human face. It can be understood that the shape of the reflector 21 can also be adjusted, such as setting the upper, lower, left, and right sides of the reflector 21 as inclined planes, giving the reflector 21 an overall radial structure.

[0040] Furthermore, the inner wall of the reflector 21 is coated with a diffuse reflection coating. This coating diffuses light; specifically, it can be a white, matte-textured paint using high-purity titanium dioxide to improve reflectivity, with added silica powder or glass microspheres to create a matte surface and enhance the diffuse reflection effect. The light sources from the three adjustable light wave panels 221 are fully diffused between the face and the inner wall of the reflector 21, resulting in uniform, shadow-free illumination of the face without overexposure or bright spots.

[0041] Furthermore, the scanning component 3 includes a structured light projector 31, which projects structured light to establish three-dimensional facial information. The structured light projector 31 is connected to the control module 12 and can project coded light patterns. When structured light is projected onto the face surface, the uneven contours of the skin cause the grating to distort, thereby capturing the deformed pattern to calculate the three-dimensional shape of the object. The structured light projector 31 is used to capture microscopic contours such as wrinkles and pores on the face, and it is not affected by other light sources, thus establishing three-dimensional information of the detected face and providing a reference for subsequent structural detection.

[0042] Furthermore, the scanning component 3 also includes a high-speed grayscale camera 32 and a color camera 33, which are combined to capture facial images. Both the high-speed grayscale camera 32 and the color camera 33 are connected to the control module 12 and upload the captured images. The high-speed grayscale camera 32 is used to capture the deformed patterns of the structured light projection at a high frame rate, strictly synchronized with the structured light projector 31 to ensure data continuity during dynamic scanning. The high-speed grayscale camera 32 is used to capture grayscale images to adapt to environments with different light intensities and to perform dynamic scanning of the face. The color camera 33 is used to acquire RGB texture images of the face surface, register them with the three-dimensional model of the structured light projector 31, and combine its scanned images with the grayscale and three-dimensional images to present a complete three-dimensional facial image, restoring realistic skin tone.

[0043] Furthermore, the structured light projector 31, the high-speed grayscale camera 32, and the color camera 33 are arranged vertically at intervals along the arc-shaped reflector 21, and their illumination directions intersect at a single point. The structured light projector 31, the high-speed grayscale camera 32, and the color camera 33 are arranged at intervals along the outer arc surface of the reflector 21. The high-speed grayscale camera 32 and the color camera 33 located on the upper and lower sides are respectively tilted to the horizontal line, so that all three illuminate the center position of the detection cavity 211, and the illumination lines intersect at a single point located on the human face. During the detection process, the structured light projector 31 emits a coded pattern, and the high-speed grayscale camera 32 simultaneously captures a deformable grating to form a grayscale three-dimensional model. The color camera 33 captures a high-definition color image under the uniform illumination of the adjustable light wave plate 221, mapping the RGB texture onto the surface of the three-dimensional model, thereby forming three-dimensional face data. A composite model that can be used for skin analysis is output for precise skin analysis.

[0044] Furthermore, the base 1 also includes a mounting component 11, which has a mounting hole 111 for connecting an external bracket. In this embodiment, the mounting component 11 is fixedly connected to the bottom of the reflector 21, and the mounting hole 111 is threaded. The external bracket is connected to the mounting component 11 by bolts or other connecting components, thereby allowing the multispectral face photography device to be mounted on an external support structure and achieving height adjustment.

[0045] Furthermore, the multispectral face imaging device also includes a housing 4, which is semi-enclosed and fitted around the outside of the reflector 21. The scanning component 3 is housed between the reflector 21 and the housing 4. The housing 4 has a semi-enclosed arc-shaped structure. The upper edge of the housing 4 is connected to the upper edge of the reflector 21, the side of the housing 4 is connected to the side of the reflector 21, and the lower end of the housing 4 is connected to the edge of the base 1. This allows the reflector 21 to semi-enclose the housing 4 and the base 1, and the scanning component 3 is disposed outside the reflector 21, thus protecting the scanning component 3 from the housing 4. The housing 4 can be connected to the reflector 21 and the base 1 by adhesive bonding, thereby ensuring a neat appearance for the entire device.

[0046] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A multispectral face photography device, characterized in that, include: The base is equipped with a control module; The supplementary lighting assembly includes a reflector and supplementary lighting components. The reflector is connected to the base and forms a detection cavity for accommodating a human face. The supplementary lighting components are installed on the inner wall of the reflector and are evenly distributed along the arc-shaped extension direction of the reflector. The supplementary lighting components are electrically connected to the control module and are used to emit multiple wavelength light sources. A scanning component is mounted on the reflector and extends into the detection cavity. The scanning component is electrically connected to the control module and transmits face detection data.

2. The multispectral face photography device according to claim 1, characterized in that, The supplementary lighting component includes multiple adjustable light wave lamp panels, which are distributed laterally at intervals along the arc-shaped reflector. Each adjustable light wave lamp panel integrates multiple LED chips of different wavelengths.

3. The multispectral face photography device according to claim 2, characterized in that, The adjustable light wave lamp plate is provided in three parts, and the perpendicular bisectors of the three adjustable light wave lamp plates intersect at a point in the detection cavity. The angle between the perpendicular bisectors of two adjacent adjustable light wave lamp plates is 45 degrees.

4. The multispectral face photography device according to claim 1, characterized in that, The upper and lower parts of the reflector both extend in an arc shape, and the reflector has a hemispherical structure.

5. The multispectral face photography device according to claim 1, characterized in that, The inner wall of the reflector is coated with a diffuse reflection coating.

6. The multispectral face photography device according to claim 1, characterized in that, The scanning component includes a structured light projector, which projects structured light to establish three-dimensional facial information.

7. The multispectral face photography device according to claim 6, characterized in that, The scanning component also includes a high-speed grayscale camera and a color camera, which are combined to capture facial images.

8. The multispectral face photography device according to claim 7, characterized in that, The structured light projector, the high-speed grayscale camera, and the color camera are arranged vertically at intervals along the arc-shaped reflector and their illumination directions intersect at a point.

9. The multispectral face imaging device according to any one of claims 1 to 8, characterized in that, The base also includes a mounting component, which has mounting holes for connecting an external bracket.

10. The multispectral face imaging device according to any one of claims 1 to 8, characterized in that, It also includes a housing that partially surrounds the outside of the reflector, and the scanning assembly is housed between the reflector and the housing.

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