WO2024098322A1

WO2024098322A1 - Method for synthesizing 3d human face model by using optical reflection

Info

Publication number: WO2024098322A1
Application number: PCT/CN2022/131102
Authority: WO
Inventors: 郑炜钢; 刘东旭; 余旭光
Original assignee: 杭州小肤科技有限公司
Priority date: 2022-11-10
Filing date: 2022-11-10
Publication date: 2024-05-16

Abstract

The present invention relates to a method for synthesizing a three-dimensional (3D) human face model by using optical reflection. The solution comprises: acquiring, from optical reflection mirrors, a plurality of 3D human face images and RGB color images at a plurality of angles relative to a front face by rotating a 3D structured light rotating module, wherein the optical reflection mirrors respectively correspond to acquisition positions of the 3D human face images at all the angles; according to the 3D human face images and the RGB color images, generating point cloud images and color maps corresponding to all the angles; synthesizing the corresponding point cloud images in two 3D human face images having a minimum absolute value of the angle relative to the front face into a first synthesized image; sequentially synthesizing the corresponding point cloud images in the 3D human face images of the remaining angles and the first synthesized image; and according to the color maps, carrying out rendering on the synthesized image to obtain a 3D human face model. The method has the advantages that image precision is high, more accurate human face depth information can be obtained, and a good reference is provided for aesthetic plastic surgery.

Description

A method for synthesizing 3D face model using optical reflection

Technical Field

The present invention relates to a method for synthesizing a 3D human face model, and in particular to a method for synthesizing a 3D human face model by utilizing optical reflection.

Background technique

With the continuous progress of the times and society, people are paying more and more attention to their skin and other appearance features, so the demand for understanding their skin condition is becoming stronger and stronger. In the fields of medical beauty, such as skin care product recommendations and skin quality analysis, people usually have to conduct certain tests and analyses on the skin condition of the whole face, and then formulate corresponding strategies based on the analysis results. The skin is tested by using analytical instruments, and suitable skin care products are recommended based on the test results, or corresponding skin care strategies are formulated. Among them, the skin detector is an instrument used to detect the skin. It is equipped with professional detection software to help consumers intuitively and quickly understand the health status of their skin. It has a beautiful interface and practical functions. It should also have several major analysis modules and can accurately analyze the skin oil, moisture, spots, pores, and skin age. The moisture data is directly obtained by obtaining the water data under the skin stratum corneum, and the data accuracy is high.

However, current skin detectors usually only have a single camera for shooting, or they shoot faces by rotating the device. The former can only shoot facial images from one angle each time. If facial images from different angles need to be shot, the head must be rotated manually and the pictures taken are basically two-dimensional. The image cannot be rotated in three dimensions, and the contour analysis is not accurate. The latter is extremely costly and expensive.

In summary, there is an urgent need for a 3D structured light full-face imaging device combined with optical reflective imaging that can meet the growing needs of consumers.

Summary of the invention

The purpose of the present invention is to provide a method for synthesizing a 3D face model using optical reflection in order to solve the above problems in the prior art.

In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme: A method for synthesizing a 3D face model using optical reflection comprises the following steps:

S100, obtaining a plurality of three-dimensional facial images and RGB color images at multiple angles relative to the front face from an optical reflector by rotating a 3D structured light rotation module, wherein the optical reflector corresponds to a position for obtaining a three-dimensional facial image at each angle;

S200, generating point cloud images and color maps corresponding to various angles based on the three-dimensional face image and the RGB color image.

S300, synthesizing the corresponding point cloud images in the two three-dimensional face images with the smallest absolute value of the relative frontal face angle into a first synthesized image;

S400, sequentially synthesizing the point cloud images corresponding to the three-dimensional face images at the remaining angles with the first synthesized image;

S500, rendering the synthesized image according to the color map to obtain a 3D face model.

Working principle and beneficial effects: 1. Compared with the existing technology, there is no need to rotate the entire device to shoot the user's face, so the bulky driving mechanism is omitted. Only a simple and compact rotating mechanism is needed to rotate the 3D structured light rotating module. With the multi-faceted light reflector, it is possible to shoot the face at all angles without rotating the device or the face, overcoming the shortcomings of slow rotation of the whole device and long imaging time, significantly reducing the equipment cost, and having the advantages of simple structure, easy operation, short shooting time and good user experience;

2. Compared with the fixed single-lens solution of the prior art, this method can realize the generation of three-dimensional facial images in a device of the same size, and the use of a structured light camera can obtain more accurate facial depth information, while the single-lens solution can only generate two-dimensional facial images. Therefore, there is a significant difference between the two. The three-dimensional facial image obtained by this method provides a better reference for medical cosmetic surgery, and can obtain information that cannot be obtained by two-dimensional images, and has more comprehensive functions;

3. Compared with the multi-lens solution, this method only has one lens, which is obviously lower in cost and simpler in structure.

4. The two 3D facial images with the smallest absolute value of relative frontal angle are the two 3D facial images closest to the front of the face. They contain lips, nose, and eyes, and their depth information fluctuates greatly, making them easy to align. Therefore, these two images are used as the starting point for alignment, which can facilitate positioning.

Furthermore, the number of the optical reflectors is four, corresponding to -15 degrees, 15 degrees, -45 degrees and 45 degrees relative to the front face, respectively, wherein the synthesis step comprises:

S300, synthesizing the corresponding point cloud images in the two three-dimensional face images at -15 degrees and 15 degrees to obtain a first synthesized image;

S400, synthesizing the point cloud image corresponding to a three-dimensional face image at -45 degrees or 45 degrees with the first synthesized image to obtain a second synthesized image;

S500, synthesizing the corresponding point cloud image in the remaining three-dimensional face image with the second synthesized image to obtain a complete 3D face image;

S600: Rendering the complete face 3D image according to the color map to obtain a 3D face model.

Furthermore, the step of synthesizing the image includes:

S410, acquiring point cloud data output by the 3D structured light rotation module;

S420, performing a rough alignment of a preset 3D structured light rotation module position and rotation angle according to the point cloud data;

S430, performing precise registration according to the overlapping points in the point cloud data;

S440, filtering the overlapping points to complete the synthesis splicing.

Through the above steps, the two composite images can be quickly spliced together to form a complete 3D face model for subsequent rendering.

Furthermore, the rendering step includes:

S450, performing three-dimensional reconstruction on the spliced point cloud data to generate a triangular mesh;

S460, obtaining a texture image obtained by the RGB camera in the 3D structured light rotation module, and pasting it onto the grid of the reconstructed three-dimensional model to generate a 3D face model.

Through the above steps, the 3D face model can be covered with a color two-dimensional photo to obtain a realistic 3D face model, which can be rotated and observed on a computer device, greatly facilitating the doctor's observation and allowing the doctor to clearly know the height of the nose, the depression of the eyes, the depth of the wrinkles, the size and protrusion of the mouth.

Furthermore, it also includes a 3D structured light full-face imaging device, which includes a head resting area, a 3D structured light rotating module and a plurality of optical reflectors; the 3D structured light rotating module is located in the center in front of the head resting area, and can rotate with itself as the axis through the shaft drive; the optical reflectors are arranged around the 3D structured light rotating module; the number of the optical reflectors is four, corresponding to the positions of -45 degrees, -15 degrees, 15 degrees and 45 degrees of the face in the head resting area. Through this device, the user's face can be quickly scanned, thereby conveniently forming a 3D face model of the user.

Furthermore, the optical reflector is divided into a first reflector, a second reflector, a third reflector and a fourth reflector, with the connection line between the 3D structured light rotation module and the head resting area as the 0-degree line, the angle between the connection line between the first reflector and the head resting area and the 0-degree line is 90 degrees, the angle between the connection line between the second reflector and the head resting area and the 0-degree line is 45 degrees, the third reflector and the second reflector are mirror-set at the 0-degree line, and the fourth reflector and the first reflector are mirror-set at the 0-degree line. This solution can quickly locate the position of each reflector, making it convenient to install each reflector. This solution only requires rotating the shaft in sequence, that is, the shaft rotates clockwise or counterclockwise, and finally returns to the initial position. Each rotation can be positioned by the motor, and can also be stopped for shooting by controlling the start and stop of the motor. It is easy to control and has low difficulty.

Furthermore, the shaft drives the 3D structured light rotation module to turn to the first reflector, the second reflector, the third reflector, and the fourth reflector in sequence. In this solution, it is only necessary to rotate the shaft in sequence, that is, the shaft rotates clockwise or counterclockwise, and finally returns to the initial position. Each rotation can be positioned by the motor, and the motor can be controlled to stop and perform shooting operations. The control is convenient and the implementation difficulty is low.

Furthermore, it also includes a light shield and a lighting lamp arranged in the light shield, and the light shield shields the head rest area, the 3D structured light rotation module and the plurality of optical reflectors. This solution can effectively avoid the influence of external light sources, and the lighting lamp turned on inside can be turned on as needed.

Furthermore, the head rest area is provided with a chin rest and a forehead rest, and the face is fixed by the chin rest and the forehead rest. This solution can conveniently fix the user's head, and the user experience is good, so that the user's head can always be at the best height, thereby generating a complete face model.

Furthermore, the reflectivity of each optical reflector is greater than or equal to 90%. Optical reflectors with a reflectivity of more than 90% can provide better collected images for the 3D structured light rotation module, significantly improving the quality of its final face model.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of an embodiment of the device of the present invention;

Figure 2 is a schematic diagram of the use status of the device of the present invention Figure 1 ;

Figure 3 is a schematic diagram of the use status of the device of the present invention Figure 2 ;

FIG4 is a flow chart of an embodiment of the method of the present invention;

FIG5 is a point cloud image at -15 degrees obtained by the method of the present invention;

FIG6 is a point cloud image of 15 degrees obtained by the method of the present invention;

FIG7 is a 45-degree point cloud image obtained by the method of the present invention;

FIG8 is a point cloud image at -45 degrees obtained by the method of the present invention;

FIG. 9 is a schematic diagram of an image generated by the present invention.

In the figure, 1. head rest area; 2. 3D structured light rotation module; 3. chin rest; 4. user; 5. shaft; 6. motor; 7. light shield; 8. lighting; 9. first reflector; 10. second reflector; 11. third reflector; 12. fourth reflector; 13. forehead rest.

Detailed ways

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

For easier understanding, let's first explain the principle of 3D structured light: The basic principle of 3D structured light technology is to project light with certain structural characteristics onto the object being photographed through a near-infrared laser, and then collect it with a special infrared camera. This light with a certain structure will collect different image phase information due to different depth areas of the object being photographed, and then convert the change of this structure into depth information through the calculation unit to obtain the three-dimensional structure. In simple terms, the three-dimensional structure of the object being photographed is obtained by optical means, and then the obtained information is applied more deeply.

A depth image, also called a distance image, refers to an image that uses the distance (depth) value from the image collector to each point in the scene as the pixel value.

Point cloud: When a laser beam hits the surface of an object, the reflected laser will carry information such as direction and distance. If the laser beam is scanned along a certain trajectory, the reflected laser point information will be recorded while scanning. Since the scanning is extremely precise, a large number of laser points can be obtained, thus forming a laser point cloud. Point cloud data is discrete data obtained by scanning and sampling the surface of a real object.

Depth images can be calculated into point cloud data after coordinate transformation; point cloud data with rules and necessary information can be inversely calculated into depth images. The two can be transformed into each other under certain conditions.

As shown in Fig. 1-3 , the device used in the method includes a head rest area 1, a 3D structured light rotation module 2 and a plurality of optical reflectors, wherein the head rest area 1 is provided with a chin rest 3 that matches the chin of the human face and a forehead rest 13 that abuts against the forehead of the human face, and a bracket similar to the chin rest 3 that abuts against the top of the head can also be used to fix the head, and a latex pad or other soft cushion can be installed on the chin rest 3, and it can be replaced by itself for easy disinfection. When in use, the chin rest 3 of the user 4 is on the chin rest 3, and the 3D structured light rotation module 2 is installed on the rotating shaft 5, and at least includes the 3D structured light rotation module 2 at least includes an RGB camera and a structured light camera. The establishment of the face model is achieved through the RGB camera and the structured light camera.

Specifically, the 3D structured light rotating module 2 is located in the center in front of the head rest area 1, and can rotate with itself as the axis through the drive of the rotating shaft 5. The rotating shaft 5 is driven by a common stepper motor 6 or a servo motor 6, and the motor 6 is controlled by a common computer device. The 3D structured light rotating module 2 is also controlled by the computer device to generate a face model on the computer device.

Specifically, the optical reflector is arranged around the 3D structured light rotating module 2 to reflect the light emitted by the 3D structured light rotating module 2. The optical reflector is a commercially available product and is mounted on an external fixed bracket by means of screws, glue, etc. The fixed bracket is not shown in the attached figure.

Preferably, the reflectivity of each optical reflector is greater than or equal to 90%. Optical reflectors with a reflectivity of more than 90% can provide better captured images for the 3D structured light rotation module 2, significantly improving the quality of its final face model.

In this embodiment, a light shield 7 and a lighting lamp 8 disposed in the light shield 7 are also included, and the light shield 7 is used to shield the head rest area 1, the 3D structured light rotating module 2 and a plurality of optical reflectors, wherein the light shield 7 can be a common black cloth, which can be directly covered on the device, or a cover made of other opaque materials, as shown in FIG1 , and the device is made into a semi-enclosed structure, exposing only an opening for the human head to enter, and a forehead support 13 for supporting the user's forehead. When the 3D structured light rotating module 2 is shooting, the lighting lamp 8 is turned off. This is mainly to avoid the influence of the lighting lamp 8 on the shooting. This solution can effectively avoid the influence of external light sources, and the internally turned lighting lamp 8 can be turned on as needed.

Preferably, there are four optical reflectors, which correspond to the positions of -45 degrees, -15 degrees, 15 degrees and 45 degrees of the face of the head resting area 1, respectively. The optical reflectors are divided into a first reflector 9, a second reflector 10, a third reflector 11 and a fourth reflector 12. The connecting line between the 3D structured light rotation module 2 and the head resting area 1 is the 0-degree line, the angle between the connecting line between the first reflector 9 and the head resting area 1 and the 0-degree line is 90 degrees, the angle between the connecting line between the second reflector 10 and the head resting area 1 and the 0-degree line is 45 degrees, the third reflector 11 and the second reflector 10 are mirrored at the 0-degree line, and the fourth reflector 12 and the first reflector 9 are mirrored at the 0-degree line. This solution can quickly locate the position of each reflector, which is convenient for the installation of each reflector. As shown in FIG3 , the installation angles of the reflector are -90 degrees, -45 degrees, 45 degrees and 90 degrees, and the angles that the motor 6 needs to rotate are -45 degrees, -105 degrees, 105 degrees and 45 degrees, respectively. When the motor 6 rotates to -45 degrees, it corresponds to the first reflector 9 at -90 degrees, and the -45 degree face data is obtained;

When the motor 6 rotates to -105 degrees, the second reflector 10 corresponding to -45 degrees is obtained, and the face data of -15 degrees is obtained;

When the motor 6 rotates to 105 degrees, the third reflector 11 corresponding to 45 degrees is obtained, and 15 degrees of face data are obtained;

When the motor 6 rotates to 45 degrees, the fourth reflector 12 corresponding to 90 degrees is rotated, and 45-degree face data is obtained.

Therefore, when in use, the shaft 5 drives the 3D structured light rotating module 2 to turn to the first reflector 9, the second reflector 10, the third reflector 11, and the fourth reflector 12 in sequence, and the shaft 5 is started to rotate to the -45 degree position, and the RGB light, PL, and UV light of the 3D structured light rotating module 2 are turned on in sequence to take pictures, and a group of pictures and corresponding depth data information are obtained, and then the shaft 5 is rotated to the -105 degree, 105 degree and 45 degree positions, and the RGB light, PL, and UV light are turned on in sequence to take pictures, and three different groups of pictures and corresponding depth data information are obtained respectively, and the lighting lamp 8 is turned off when taking pictures. In this solution, it is only necessary to rotate the shaft 5 in sequence, that is, the shaft 5 rotates clockwise or counterclockwise, and finally returns to the initial position. Each rotation can be positioned by the motor 6, and the motor 6 can also be controlled to stop and perform shooting operations. The control is convenient and the implementation difficulty is low.

As shown in FIG4 , the method for synthesizing a 3D face model using optical reflection includes the following steps:

S000, the user's face is placed on the head rest area 1 on the device, and the device is turned on;

S100, driving the rotating 3D structured light rotating module 2 by the motor 6 to obtain the three-dimensional face image and RGB color image including -15 degrees, 15 degrees, -45 degrees and 45 degrees relative to the front face from the optical reflector, wherein the number of the optical reflectors is four, corresponding to the three-dimensional face image acquisition position at each angle respectively;

Compared with the prior art, there is no need to rotate the entire device to capture the user's face, thus eliminating the need for a bulky driving mechanism. Only a simple and compact rotation mechanism is needed to rotate the 3D structured light rotation module 2. In conjunction with a multi-faceted light reflector, the face can be captured at all angles without rotating the device or the face, significantly reducing the cost of the equipment. It has the advantages of simple structure, easy operation, short shooting time, and good user experience.

Compared with the fixed single-lens solution in the prior art, this method can generate three-dimensional facial images in a device of the same size, while the single-lens solution can only generate two-dimensional facial images. Therefore, there is a significant difference between the two. The three-dimensional facial images obtained by this method provide a better reference for medical cosmetic surgery, can obtain information that cannot be obtained from two-dimensional images, and have more comprehensive and rich functions.

Compared with the multi-lens solution, this method only has one lens, which is obviously lower in cost and simpler in structure.

S200, generating 3D point cloud images and color maps corresponding to various angles through the internal and external parameters of the 3D structured light rotation module 2 and the RGB color camera, and the generated algorithm is the existing technology;

The -15 degree and 15 degree images contain the lips, nose, and eyes of the face. The depth information fluctuates greatly and is easy to align. Therefore, these two images are used as the starting point for alignment.

S400, synthesizing the corresponding point cloud images in the two -45 degree three-dimensional images of the face to obtain a first synthesized image and a second synthesized image;

S500, synthesizing the corresponding point cloud images in the two 45-degree three-dimensional face images with the second synthesized image to obtain a complete 3D face image;

S600, obtaining the point cloud data output by the 3D structured light rotation module 2, performing down-sampling of the corresponding point cloud data by n, reducing the number of points in the point cloud data, which is equivalent to a filtering operation, and improving the synthesis speed;

S610, performing a rough alignment of the preset position and rotation angle of the 3D structured light rotation module 2 according to the point cloud data, specifically, translating and rotating the selected point cloud data according to the shooting distance and angle of the 3D structured light rotation module 2, so that the selected point cloud data is at the spatial coordinate position (0, 0), and completing the rough alignment;

S620, performing precise registration according to the overlapping points in the point cloud data, specifically by setting parameters of an existing registration algorithm;

S630, filtering the coincident points to complete the synthesis splicing;

S640, performing three-dimensional reconstruction on the spliced point cloud data to generate a triangular mesh;

S650, obtain the texture image obtained by the RGB camera in the 3D structured light rotation module 2, paste it on the grid of the reconstructed three-dimensional model, and generate a 3D face model. Through the data obtained by the structured light camera in the 3D structured light rotation module 2, we can accurately know the distance of each point in the image from the camera. In this way, adding the (x, y) coordinates of the point in the 2d image of the RGB camera, we can obtain the three-dimensional spatial coordinates of each point in the image. The corresponding grid can cover the 3D face model with a color two-dimensional photo to obtain a realistic 3D face model, which can be rotated and observed on a computer device, which greatly facilitates the doctor's observation and can clearly know the height of the nose, the depression of the eyes, the depth of the wrinkles, the size and protrusion of the mouth.

See Figure 9 , where 1-4 represent the images collected on the first reflector 9, the second reflector 10, the third reflector 11, and the fourth reflector 12, see Figures 5-8 , and the middle of Figure 9 is the merged and rendered image. The original image is a color image with more facial details. The generated face model can be used for analysis of facial skin, such as the depth of wrinkles, the size of acne, etc.

The advantages of using structured light (speckle) in this solution are mainly:

1) The solution is mature and the camera baseline can be made relatively small, which facilitates miniaturization.

2) Low resource consumption: a single frame of IR image can be used to calculate the depth map, with low power consumption.

3) Active light source, can be used at night.

4) High accuracy and resolution within a certain range, the resolution can reach 1280x1024 and the frame rate can reach 60FPS.

The parts not described in detail in the present invention are prior art, so the present invention does not describe them in detail.

It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

Although this article uses more terms such as head rest area 1, 3D structured light rotation module 2, chin rest 3, user 4, rotation axis 5, motor 6, light shield 7, lighting lamp 8, first reflector 9, second reflector 10, third reflector 11, fourth reflector 12, forehead rest 13, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

A method for synthesizing a 3D face model using optical reflection, characterized in that it includes the following steps: obtaining multiple three-dimensional face images and RGB color images at multiple angles relative to the front face from an optical reflector by rotating a 3D structured light rotation module, wherein the optical reflector corresponds to the position of obtaining the three-dimensional face image at each angle; generating point cloud images and color maps corresponding to each angle based on the three-dimensional face image and the RGB color image; synthesizing the point cloud images corresponding to the two three-dimensional face images with the smallest absolute value of the angle relative to the front face into a first synthesized image; sequentially synthesizing the point cloud images corresponding to the three-dimensional face images at the remaining angles with the first synthesized image; and synthesizing the point cloud images corresponding to the three-dimensional face images according to the color maps. The synthesized image is rendered to obtain a 3D face model; the number of the optical reflectors is four, corresponding to -15 degrees, 15 degrees, -45 degrees and 45 degrees relative to the front face, respectively, wherein the synthesis step comprises: synthesizing the corresponding point cloud images in the two three-dimensional face images of -15 degrees and 15 degrees to obtain a first synthesized image; synthesizing the corresponding point cloud image in a three-dimensional face image of -45 degrees or 45 degrees with the first synthesized image to obtain a second synthesized image; synthesizing the corresponding point cloud image in the remaining three-dimensional face image with the second synthesized image to obtain a complete face 3D image; rendering the complete face 3D image according to the color map to obtain a 3D face model.
According to a method for synthesizing a 3D face model using optical reflection according to claim 1, it is characterized in that the image synthesis step includes: obtaining point cloud data output by a 3D structured light rotation module; performing coarse alignment of a preset 3D structured light rotation module position and rotation angle based on the point cloud data; performing fine alignment based on overlapping points in the point cloud data; and filtering overlapping points to complete synthetic splicing.
According to the method of synthesizing a 3D face model using optical reflection according to claim 2, it is characterized in that the rendering step includes: performing three-dimensional reconstruction on the spliced point cloud data to produce a triangular mesh; obtaining a texture image obtained by an RGB camera in a 3D structured light rotation module, and pasting it on the mesh of the reconstructed three-dimensional model to generate a 3D face model.
According to a method for synthesizing a 3D face model using optical reflection according to claim 1, it is characterized in that it also includes a 3D structured light full-face imaging device, the 3D structured light full-face imaging device includes a head placement area, a 3D structured light rotation module and a plurality of optical reflectors; the 3D structured light rotation module is located in the center in front of the head placement area, and can rotate with itself as the axis through a rotating shaft drive; the optical reflectors are arranged around the 3D structured light rotation module.
According to a method for synthesizing a 3D face model using optical reflection according to claim 4, it is characterized in that each of the optical reflectors is vertically arranged and is divided into a first reflector, a second reflector, a third reflector and a fourth reflector, which correspond to -45 degrees, -15 degrees, 15 degrees and 45 degrees of the face in the head rest area respectively; with the connecting line between the center of the 3D structured light rotation module and the center of the head rest area as the 0 degree line, the first reflector and the fourth reflector are respectively located at the left front position and the right front position of the head rest area, the second reflector and the third reflector are respectively located at the left front position and the right front position of the 3D structured light rotation module; the third reflector and The second reflector is mirrored with the 0-degree line as the center line and is perpendicular to each other. The fourth reflector and the first reflector are mirrored with the 0-degree line as the center line and are parallel to each other. When the rotating shaft is rotated to -45 degrees, the 3D structured light rotation module can face and correspond to the first reflector, and obtain -45-degree facial data from the first reflector. When the rotating shaft is rotated to -105 degrees, the 3D structured light rotation module can face and correspond to the second reflector, and obtain -15-degree facial data from the second reflector. When the rotating shaft is rotated to 105 degrees, the 3D structured light rotation module can face and correspond to the third reflector, and obtain 15-degree facial data from the third reflector. When the rotating shaft is rotated to 45 degrees, the 3D structured light rotation module can face and correspond to the fourth reflector, and obtain 45-degree facial data from the fourth reflector.
According to the method for synthesizing a 3D face model using optical reflection according to claim 5, it is characterized in that the rotating shaft drives the 3D structured light rotation module to turn to the first reflector, the second reflector, the third reflector, and the fourth reflector in sequence.
According to claim 6, a method for synthesizing a 3D face model using optical reflection is characterized in that it also includes a light shield and a lighting lamp arranged in the light shield, and the light shield is used to shield the head rest area, the 3D structured light rotation module and the multiple optical reflectors.
According to a method for synthesizing a 3D face model using optical reflection according to any one of claims 5 to 7, it is characterized in that the head rest area is provided with a chin rest and a forehead rest, and the face is fixed by the chin rest and the forehead rest.
The method for synthesizing a 3D face model using optical reflection according to any one of claims 1 to 7, characterized in that the reflectivity of each of the optical reflectors is greater than or equal to 90%.