Portable facial two-dimensional head image multi-angle acquisition positioning device

Abstract

The invention discloses a portable facial two-dimensional head image multi-angle acquisition positioning device, which solves the problems of heavy weight, large angle error and lack of real-time guidance of the existing equipment through a foldable bracket, a high-precision servo motor and a multi-mode positioning feedback and self-adaptive light supplement technology, and is suitable for rapid facial modeling and recognition in a mobile scene. The device can realize efficient multi-angle synchronous acquisition of two-dimensional images of the head and the face, and has the advantages of good portability, high precision, simplicity and convenience in operation, high environmental adaptability and the like.

Description

Technical Field

[0001] The present invention relates to the field of image acquisition and processing technology, specifically to a device designed for multi-angle synchronous acquisition, precise positioning, and portable operation of two-dimensional head and facial images. This device can be widely used in a variety of fields, including head and facial feature imaging, medical cosmetic assessment, ergonomic testing, and facial modeling and recognition. Background Art

[0002] In existing head and face image acquisition technologies, traditional facial acquisition devices face many challenges, as follows: Angle fixation problem: Usually, a single-angle fixed camera or a multi-angle shooting method that requires manual adjustment is used. It is difficult to achieve simultaneous acquisition of multiple angles of the face (such as the front and both sides). This results in incomplete angles of the acquired image data and is unable to fully reflect the characteristics of the head and face.

[0003] Manual operation is cumbersome: Existing equipment requires manual adjustment of the subject's head position or camera angle. This operation method is not only inefficient, but also easily introduces errors during the operation, affecting the subsequent image processing and application.

[0004] Lack of portability: Large-scale data acquisition equipment such as VISIA-CR is bulky and heavy, making it difficult to meet the needs of multi-regional portability and multi-scenario applications, limiting its scope of use.

[0005] Low positioning accuracy: The lack of precise control of the subject's head and facial position and real-time feedback mechanism makes image alignment difficult, seriously affecting the subsequent processing effect and unable to meet the needs of some scenarios with high precision requirements. Summary of the Invention

[0006] The present invention aims to solve the above-mentioned defects in the prior art and achieve the following objectives: It realizes efficient multi-angle synchronous acquisition of head and facial two-dimensional images, covering the front and bilateral sides (±90°) to ensure the acquisition of comprehensive head and facial image data.

[0007] Provides head and face position fixation assistance and real-time positioning feedback to ensure the precise alignment of the subject's face and the camera, improving image accuracy and consistency.

[0008] The lightweight design and portable structure with built-in long-life battery meet the needs of outdoor and mobile scenarios and expand the application range of the device.

[0009] A portable multi-angle facial two-dimensional head image acquisition and positioning device mainly consists of the following modules: Rotatable bracket system Structure and Drive: The support structure utilizes a semi-circular guide rail crafted from aluminum alloy with a bionic honeycomb structure. Folded, it measures 300 × 200 × 150 mm and weighs 1.2 kg. When unfolded, it has an inner diameter of 450 mm and an outer diameter of 500 mm. A rack structure embedded within the rail meshes with the gears of a servo motor (model DM1-XXXX), enabling precise horizontal adjustment within ±90°. The rail is mounted on a portable folding table, and the table legs are equipped with a motorized lift mechanism for automatic height adjustment to suit different usage scenarios and user needs.

[0010] Multi-camera array: Equipped with three cameras (Sony IMX377) with ≥12 megapixels, spaced at preset angles, the camera supports synchronized triggering, HDR synthesis, and RAW output. The cameras feature built-in image sensors (CMOS) and optical image stabilization, ensuring clear and stable images in dynamic environments.

[0011] Synchronous control system: The central controller (STM32F4) is triggered synchronously by PWM signals, with a shutter delay of ≤1ms, ensuring that multiple cameras can shoot synchronously and obtain high-quality images.

[0012] Multimodal positioning and feedback system Laser Positioner: It emits a 635nm, 0.5mm line width cross laser line, which is projected onto the tip of the nose of the subject to assist in facial positioning, allowing the user to accurately place the face in the appropriate position.

[0013] Infrared / ToF depth sensor: Uses the VL53L5CX chip to detect facial distance (10-100cm, accuracy ±1mm), assisting in facial contour recognition in low-light environments and improving positioning accuracy under different lighting conditions.

[0014] Distance sensor: Detects the distance between the face and the camera in real time (accuracy ±1mm), and calibrates through LED indicators or sound prompts, allowing users to adjust the distance between their face and the camera in a timely manner.

[0015] Visual feedback: A 1.3-inch OLED screen displays the offset in real time, allowing users to intuitively understand the offset of the facial position and make adjustments.

[0016] Dynamic compensation: The six-axis gyroscope (MPU6050) collects device posture and adjusts the motor angle using a PID algorithm to compensate for hand-held jitter (compensation frequency 200Hz), ensuring device stability during use.

[0017] Fill light and energy management system Adaptive Ring LED Fill Light Array: Consisting of 48 color-adjustable LEDs (3000K-6000K), each independently controlled across four zones with a brightness variance of ≤5%. This evenly covers the face, eliminating shadows and ensuring uniform lighting in captured images.

[0018] Power supply: Equipped with a 10000mAh removable lithium battery (life of about 4 hours), supports PD fast charging (charged to 50% in 30 minutes), meeting the needs of use in mobile scenarios.

[0019] Cabinet design: The cabinet that integrates all modules is made of waterproof and shockproof materials to protect the equipment from damage during transportation and use.

[0020] Software Control Logic: The main control module runs Linux and integrates an inverse kinematics algorithm and data encryption transmission capabilities. This algorithm generates motor motion trajectories based on target angles, encrypts them with AES-256, and uploads them to the cloud via Wi-Fi 6, ensuring data security and transmission stability. Compared with the prior art, the present invention has the following beneficial effects: Good portability: The overall weight is light and it can be folded and carried. The volume is reduced by 60% after folding, and the overall weight is ≤2.5kg, which is convenient for users to carry and move.

[0021] High precision: angular error ≤±0.5°, positioning accuracy ≤1mm, which can meet the needs of high-precision image acquisition.

[0022] Easy to operate: The use of multimodal feedback (laser + ToF + visual guidance) lowers the user's operating threshold and enables users to operate easily.

[0023] Strong environmental adaptability: Suitable for mobile shooting in multiple locations, with an operating temperature range of -10℃~50℃, and an IP54 protection level, it can work normally under different environmental conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the present invention; In the picture: Base 1, retractable support arm 2, rotation joint 3, horizontal rotation axis 3a, folding hinge 4, camera 5, infrared sensor 7, gyroscope 8, tactile feedback unit 9, ring LED light group 10, ambient light sensor 11, controller 12. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0026] like Figure 1-2 As shown; The invention relates to a portable multi-angle acquisition and positioning device for facial two-dimensional head images.

[0027] In this embodiment: In order to solve the technical problems existing in this prior art, as disclosed in the background technology above, "in hydropower installation projects, the fixation of pipelines is a key task. Traditional pipeline fixing frames usually have a fixed structure and are difficult to adapt to pipelines with different installation angles. In addition, the fixing effect is not good for pipelines with different diameters. It is often necessary to prepare fixing frames of various specifications, which increases construction costs and difficulty. In addition, during the use of traditional fixing frames, wear is easily generated between the pipelines and the fixing frames, affecting the service life of the pipelines." In terms of actual use, this problem is obviously a real problem that is difficult to solve. In view of this, in order to solve this technical problem, a portable facial two-dimensional head image multi-angle acquisition and positioning device is provided on this basis.

[0028] like Figure 1-2 As shown in the figure; In combination with the above content, a portable facial two-dimensional head image multi-angle acquisition and positioning device is provided.

[0029] Operation process Equipment deployment: After opening the integrated box, place the track on the table and tighten the connection. Install the camera and confirm that the fixed bayonet is locked. After checking that there are no foreign objects on the track, connect the power supply to ensure that the equipment is installed correctly and is in normal working condition.

[0030] Start the device: Press the power button, the OLED screen will display the initialization interface, and the device will start initialization settings.

[0031] Face positioning: The user aligns the tip of their nose with the laser crosshairs, and the ToF sensor detects the distance and positions the face appropriately.

[0032] Angle adjustment: The central controller drives the motor to adjust the camera position according to the preset angle (such as 0°, ±45°) to achieve multi-angle shooting.

[0033] Image acquisition: Three cameras shoot synchronously, and the system verifies image quality (such as blur < 0.3) to ensure that the acquired images meet the requirements.

[0034] Data transmission: The encrypted image package is uploaded to the server via Wi-Fi6 to achieve remote transmission and storage of data.

[0035] Motion Compensation Example Scenario: After the device is moved or interfered with, the gyroscope detects a +2° pitch deviation.

[0036] Compensation: The PID algorithm outputs a pulse signal to drive the vertical slide motor to move 2° in the opposite direction, keeping the camera angle constant and ensuring that the captured image is stable and clear.

[0037] Specific structural composition Foldable rotating bracket: It consists of a base 1, a retractable support arm 2, a rotating joint 3 and a folding hinge 4. The folding hinge 4 allows the support arm 2 to be folded and stored inside the base 1, so that the bracket can be folded and unfolded, making it easy to carry and use.

[0038] Multi-camera array: can be fixed to the support arm 2, including at least three cameras 5, capable of achieving multi-angle synchronous shooting.

[0039] Multimodal positioning feedback module: integrated in the base 1, including an infrared sensor 7, a gyroscope 8 and a tactile feedback unit 9, which is used to detect the user's facial position in real time and guide the user to adjust the posture through vibration signals to improve the accuracy of positioning.

[0040] Adaptive fill light system: includes a ring-shaped LED light group 10, an ambient light sensor 11 and a controller 12. The controller 12 dynamically adjusts the color temperature and brightness of the LED light group 10 according to the input signal of the ambient light sensor 11, and performs local fill light for the shadow area of ​​the face to ensure uniform lighting of the captured image.

[0041] Specific structure and function of revolute joints The rotary joint 3 includes a horizontal rotation axis 3a, which provides continuous rotation from 0° to 360°. The torque threshold of the rotary joint 3 is set to 2N·m to 5N·m to maintain the stability of the device posture and ensure the stable position of the camera during shooting.

[0042] Multi-camera array coverage The coverage range of the multi-camera array meets the requirements of horizontal coverage angle ≥150° and vertical coverage angle ≥90°, which can fully cover all angles of the head and face and obtain complete image data.

[0043] Vibration pattern of the tactile feedback unit The vibration modes of the tactile feedback unit 9 include: The first vibration frequency (50Hz to 100Hz) indicates whether the user's face is tilted to the left or right. The second vibration frequency (150Hz to 200Hz) prompts the user that the face distance is beyond the preset range; The third vibration frequency (continuous pulse signal) prompts the user that the posture adjustment is completed, so that the user can promptly understand the adjustment status of the facial position and posture through tactile feedback.

[0044] Control logic of adaptive fill light system The adaptive fill light system's control logic automatically adjusts fill light intensity and color temperature based on ambient light intensity and facial shadows. For example, when ambient light intensity falls below 100 lux, the fill light intensity is set between 200 and 500 lux. The fill light color temperature automatically adjusts to ambient light temperature deviations within a ±500K range, ensuring optimal photography in all lighting conditions. Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A portable multi-angle facial two-dimensional head image acquisition and positioning device, characterized in that: It includes a rotatable bracket system, a multi-camera array, a synchronization control system, a multi-modal positioning and feedback system, a fill light and energy management system, and software control logic.

2. The portable facial two-dimensional head image multi-angle acquisition and positioning device according to claim 1, characterized in that: The rotatable bracket system uses a semi-circular guide rail made of bionic honeycomb structure aluminum alloy. When folded, the dimensions are 300×200×150mm and the weight is 1.2kg. When unfolded, the inner diameter is 450mm and the outer diameter is 500mm. A rack structure is embedded on the inside of the guide rail, which engages with the servo motor gear to achieve precise adjustment of ±90° in the horizontal direction. The track is installed on a portable folding table, and the table legs are equipped with an electric lifting mechanism.

3. The portable facial two-dimensional head image multi-angle acquisition and positioning device according to claim 1, characterized in that: The multi-camera array is equipped with three groups of ≥12-megapixel cameras (Sony IMX377), which are distributed at preset angles, support synchronous trigger acquisition, HDR synthesis and RAW output, and the cameras have built-in image sensors (CMOS) and optical image stabilization modules.

4. The portable facial two-dimensional head image multi-angle acquisition and positioning device according to claim 1, characterized in that: The synchronous control system adopts a central controller (STM32F4) to trigger synchronously through PWM signals, and the shutter delay is ≤1ms.

5. The portable facial two-dimensional head image multi-angle acquisition and positioning device according to claim 1, characterized in that: The multimodal positioning and feedback system includes a laser locator, an infrared / ToF depth sensor, a distance sensor, visual feedback, and a dynamic compensation unit; the laser locator emits a 635nm cross laser line with a line width of 0.5mm; the infrared / ToF depth sensor uses a VL53L5CX chip to detect facial distance (10-100cm, accuracy of ±1mm); the distance sensor detects the distance between the face and the camera in real time (accuracy of ±1mm); the visual feedback is configured with a 1.3-inch OLED screen to display the offset in real time; the dynamic compensation uses a six-axis gyroscope (MPU6050) to collect device posture, adjust the motor angle through a PID algorithm, and compensate for hand-held jitter (compensation frequency 200Hz).

6. The portable facial two-dimensional head image multi-angle acquisition and positioning device according to claim 1, characterized in that: The fill light and energy management system includes an adaptive ring-shaped LED fill light array, a power supply and a cabinet; the adaptive ring-shaped LED fill light array consists of 48 adjustable color temperature LEDs (3000K-6000K), which are independently controlled in four zones with a brightness difference of ≤5%; the power supply is a 10000mAh removable lithium battery (with a battery life of approximately 4 hours) and supports PD fast charging (charged to 50% in 30 minutes); the cabinet is made of waterproof and shockproof materials.

7. The portable facial two-dimensional head image multi-angle acquisition and positioning device according to claim 1, characterized in that: The software control logic main control module runs the Linux system, integrates inverse kinematics calculation algorithm and data encryption transmission function, and uploads it to the cloud via Wi-Fi6 after AES-256 encryption.

8. The portable facial two-dimensional head image multi-angle acquisition and positioning device according to claim 1, characterized in that: The foldable rotating bracket comprises a base (1), a retractable support arm (2), a rotating joint (3) and a folding hinge (4). The folding hinge (4) enables the support arm (2) to be folded and stored inside the base (1). The rotating joint (3) includes a horizontal rotating axis (3a) and provides continuous rotation from 0° to 360°. The torque threshold is set to 2N·m to 5N·m.

9. The portable facial two-dimensional head image multi-angle acquisition and positioning device according to claim 1, characterized in that: The multi-camera array is fixed to the support arm (2), and includes at least three cameras (5), with a coverage range of ≥150° in the horizontal direction and ≥90° in the vertical direction.

10. The portable facial two-dimensional head image multi-angle acquisition and positioning device according to claim 1, characterized in that: The multimodal positioning feedback module is integrated into the base (1), and includes an infrared sensor (7), a gyroscope (8) and a tactile feedback unit (9). The vibration mode of the tactile feedback unit (9) includes a first vibration frequency (50 Hz to 100 Hz), a second vibration frequency (150 Hz to 200 Hz) and a third vibration frequency (continuous pulse signal). The adaptive fill light system includes a ring-shaped LED light group (10), an ambient light sensor (11) and a controller (12). The controller (12) dynamically adjusts the color temperature and brightness of the LED light group (10) according to the input signal of the ambient light sensor (11). When the ambient light intensity is lower than 100 lux, the fill light intensity is started to be 200 lux to 500 lux. The fill light color temperature is automatically corrected according to the ambient light color temperature deviation, and the correction range is ±500K.

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