Self-adaptive video acquisition device

Abstract

The utility model discloses a self-adaptive video acquisition device, which comprises a base, a supporting rod, a sound source positioning module, a video acquisition module and a control unit, the sound source positioning module comprises a plurality of microphones, and the microphones are uniformly distributed along the supporting rod in the circumferential direction; the video acquisition module comprises a camera and is arranged at the end part of the supporting rod; a rotary connecting assembly is arranged between the supporting rod and the base, the rotary connecting assembly enables the supporting rod to rotate along the axis of the base, and the first motor drives the supporting rod to rotate along the axis of the base; the microphones, the camera and the first motor are electrically connected with the control unit. The self-adaptive video acquisition device has the beneficial effect of accurately acquiring the image of the speaker.

Description

Technical Field

[0001] This utility model relates to the field of video device technology, specifically to an adaptive video acquisition device. Background Technology

[0002] In the current field of video capture technology, traditional video capture devices have many limitations. Many common video capture devices are typically fixed in one location during actual use, making it difficult to flexibly change the shooting angle. In a conference room setting, if the speaker's position is not fixed, the camera struggles to consistently capture the speaker completely and clearly in the center of the frame, often resulting in missing or off-center key content. This not only affects the video conferencing experience but also reduces the usability and completeness of subsequent data.

[0003] Moreover, traditional video capture devices mostly provide only a single, fixed perspective and cannot be adjusted in real time according to the situation on site. In large-scale conferences, training sessions, and other events, there are many participants and a large activity area. Fixed-angle cameras cannot meet the needs for comprehensive and flexible video capture and are unable to effectively capture images of subjects in different locations.

[0004] Furthermore, while some devices offer some angle adjustment capabilities, they often require manual operation, which is cumbersome, slow to respond, and unable to quickly align with moving targets. In practical applications, when a speaker suddenly moves, the manual adjustment of the camera cannot keep up, causing delays and interruptions in video capture, affecting the continuity and smoothness of the video. Utility Model Content

[0005] To overcome the above-mentioned shortcomings in the prior art, this utility model provides an adaptive video acquisition device that accurately captures the speaker's image.

[0006] The technical solution of this utility model is as follows:

[0007] An adaptive video acquisition device includes a base and a support rod, and also includes a sound source localization module, a video acquisition module and a control unit;

[0008] The sound source localization module includes a plurality of microphones, and each microphone is evenly distributed circumferentially along the support rod;

[0009] The video acquisition module includes a camera, and the video acquisition module is disposed at the end of the support rod;

[0010] A rotatable connection assembly is provided between the support rod and the base, the rotatable connection assembly allowing the support rod to rotate along the axis of the base.

[0011] A first motor that drives the support rod to rotate along the base axis;

[0012] Each of the microphones, the camera, and the first motor is electrically connected to the control unit.

[0013] Preferably, the base is suspended from the top of the conference room or placed on a table. When the base is placed on a table, an anti-slip pad is provided at the contact point between the base and the table.

[0014] Preferably, in any of the above solutions, the distance between two adjacent microphones satisfies d. <C / 2f max Where C is the speed of sound, f max This represents the highest operating frequency of any microphone.

[0015] In any of the above embodiments, it is preferred that each microphone is covered with a windproof cover.

[0016] In any of the above embodiments, it is preferred that the rotating connection assembly includes a slide groove, the slide groove and the base are concentrically arranged, the support rod is inserted into the slide groove, the first motor is fixedly connected to the base, and the support rod is provided with a first gear that meshes with the drive wheel of the first motor.

[0017] In any of the above embodiments, it is preferred that the ends of the camera and the support rod are hinged to a support, a second motor is provided at the support, and a second gear that meshes with the drive wheel of the second motor is provided at the lower part of the camera.

[0018] In any of the above solutions, it is preferred that the camera is a wide-angle camera and has focusing and image stabilization functions.

[0019] In any of the above solutions, it is preferred to further include a fill light, which is located at the camera, and the control unit controls the intensity of the fill light according to the light intensity of the venue.

[0020] In any of the above solutions, it is preferred that the first motor and the second motor are servo motors or stepper motors.

[0021] Preferably, in any of the above solutions, a baffle is provided in front of the camera, and

[0022] A third motor drives the baffle, and the motor is electrically connected to the control unit. When the support rod rotates along the axis of the base, the third motor drives the baffle to move in front of the camera.

[0023] This novel adaptive video acquisition device, through a circumferentially distributed microphone array in the sound source localization module, can quickly and accurately identify the direction of the speaker's voice source. Based on the sound source localization information, the control unit drives the rotating connection assembly between the support rod and the base, as well as the first motor, to work together to turn the end-mounted camera towards the speaker's location in a very short time, enabling the camera to capture the speaker's image. Compared to traditional fixed-angle video acquisition devices, this device avoids problems such as image shift and missing subject due to changes in the speaker's position, ensuring the integrity of the core content of the video image and improving the accuracy of speaker image acquisition. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of an embodiment of the adaptive video acquisition device of this utility model.

[0025] Figure 2 This is a schematic diagram of an embodiment of the adaptive video acquisition device of this utility model, showing the rotational connection assembly, support rod, and base working together.

[0026] Figure 3 This is a schematic diagram showing the cooperation between the baffle and the camera in the adaptive video acquisition device of this utility model.

[0027] Figure 4 This is a circuit connection diagram of the adaptive video acquisition device of this utility model.

[0028] Explanation of the labels in the diagram:

[0029] 101-Camera; 102-Support; 103-Second motor; 104-Microphone; 105-Cover; 106-Support rod; 107-Second gear; 108-First gear; 109-Slide groove; 110-First motor; 111-Base; 112-Third motor; 113-Baffle. Detailed Implementation

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

[0031] In the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," 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 this utility model and 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 this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] Example 1:

[0033] This adaptive video capture device is suitable for meeting scenarios, especially roundtable meetings.

[0034] like Figure 1 , 2 As shown in Figure 4, the base 111 provides basic support for each functional component. To prevent foreign objects from getting stuck in the rotating connection assembly, a cover 105 is provided at the base 111, and the lower edge of the cover 105 is fixed to the bottom of the base 111 by screws.

[0035] The sound source localization module is used to determine the coordinate information of the speaker during the meeting. Specifically, the sound source localization module includes several microphones 104, which are evenly distributed circumferentially along the support rod 106. To better capture the speaker's voice, each microphone 104 is positioned on top of the housing 105. To achieve optimal sensitivity for each microphone 104, each microphone 104 can be a MSM261S4030H0 digital microphone.

[0036] The video capture module is used to capture images of the speakers during the meeting, enabling the speakers' presentations to be transmitted in real time during remote meetings. The video capture module includes a camera 101, which is mounted at the end of the support rod 106.

[0037] A rotating connector is provided between the support rod 106 and the base 111 to achieve a rotatable connection between the support rod 106 and the base 111. In use, driven by the first motor 110, the support rod 106 can rotate along the base 111, thereby aligning the camera 101 with the speaker. One optional form of the rotating connection assembly is as follows: the rotating connection assembly includes a slide groove 109, which is concentrically arranged with the base 111. The upper edge of the slide groove 109 is fixedly connected to the base 111 by screws. The support rod 106 is inserted into the slide groove 109 and achieves a rotatable connection with it. The first motor 110 is fixedly connected to the base 111, and a first gear 108 is provided on the support rod 106 to mesh with the drive wheel of the first motor 110.

[0038] The control unit is provided with several I / O interfaces, and each microphone 104, camera 101 and first motor 110 is electrically connected to the corresponding I / O interface of the control unit.

[0039] In practical use, the sound source localization module works as follows: 1. Signal processing and feature extraction: The acquired analog sound signal is converted into a digital signal. Through digital signal processing algorithms, such as time-domain analysis and frequency-domain analysis, effective feature parameters are extracted from the sound signal. These parameters reflect information such as the direction and distance of the sound source. 2. Coordinate calculation: The sound source coordinates are calculated based on the time difference between the sound reaching different microphones 104. Sound travels at a certain speed in the air. When a sound source emits sound, the time it takes for the sound to reach each microphone 104 differs due to the varying distances between each microphone 104 in the microphone array and the sound source. Using specific algorithms, such as triangulation, combined with the geometric layout of the microphone array and the speed of sound propagation, the two-dimensional coordinates of the sound source can be calculated. In practical use, to improve the accuracy of sound source localization, a Cartesian coordinate system is constructed using the center point of each microphone 104 as the origin, ensuring that each microphone 104 has a definite position within this system.

[0040] Once the coordinates of the sound source are determined, the control unit sends a signal to the first motor 110, causing the first motor 110 to drive the support rod 106 to adjust its angle. To ensure the accuracy of the angle adjustment of the support rod 106 and to prevent the data cable from tangling with the support rod 106, the first motor 110 can be a servo motor or a stepper motor.

[0041] After the angle of the support rod 106 is adjusted, the camera 101 of the video acquisition module captures the speaker's image and transmits it to the remote participants via wired or wireless means.

[0042] It is understood that the function of the control unit depends on the control unit hardware itself and the program installed within the control unit. It should be noted that the program is written based on the above explanation of the working principle of the adaptive video acquisition device. The specific assembly language used, the functions called, and the data debugging methods used in the program are all prior art, and the program installed within the control unit of this application is not included in the content protected by this solution. The control unit chip can be a microcontroller.

[0043] Example 2:

[0044] Based on Embodiment 1, to better adapt to meeting scenarios, the base 111 can be suspended from the top of the meeting room or placed on the table surface. When the base 111 is placed on the table surface, an anti-slip pad is provided at the contact area between the base 111 and the table surface to ensure stability.

[0045] Example 3:

[0046] Based on Embodiment 1 or 2, to ensure the accuracy of the sound source localization module in determining the sound source coordinates and to avoid spatial aliasing, the spacing between two adjacent microphones 104 satisfies d. <C / 2f max Where C is the speed of sound, f max 104 is the highest operating frequency for any microphone.

[0047] Example 4:

[0048] Based on any of the embodiments in Examples 1-3, in order to achieve windproof noise reduction and improve the accuracy of sound source localization, each of the microphones 104 is covered with a windproof cover.

[0049] The windproof cover is made of materials such as polyester fiber sound-absorbing panels, glass wool, and rock wool, and has a large number of tiny pores in its structure. When in use, when the wind blows across the microphone 104, the air flows through the pores of the material. The structure of the pores obstructs the airflow, thereby consuming the energy of the wind and reducing the interference noise generated by the wind on the microphone 104.

[0050] Example 5:

[0051] Based on any of the embodiments in Examples 1-4, such as Figure 1 In the illustrated embodiment, to adjust the pitch angle of the camera 101 to better accommodate participants of different heights, the ends of the camera 101 and the support rod 106 are hinged via a support 102. A second motor 103 is installed at the support 102, and a second gear 107 meshing with the drive wheel of the second motor 103 is installed at the lower part of the camera 101. During use, the camera 101 transmits the captured image of the speaker to the control unit. The control unit determines whether the speaker's head is vertically centered based on an algorithm based on target detection, a feature point detection algorithm, or a template matching algorithm. When the speaker's head is not vertically centered, the control unit sends a signal to the second motor 103, which then adjusts the pitch angle of the camera 101 via the second gear 107.

[0052] Example 6:

[0053] Based on any of the embodiments in Examples 1-5, in order to ensure the clarity of image acquisition, a supplementary light is added in this embodiment. The supplementary light is set at the camera 101. In use, the control unit controls the opening and closing of the supplementary light according to the feedback of the light intensity of the venue by the light intensity sensor, so as to achieve the clarity of image acquisition.

[0054] Example 7:

[0055] Based on any of the embodiments in Examples 1-6, such as Figure 3 As shown, to avoid visual discomfort or interference for remote participants due to rapid image changes and shaking during the rotation of the camera 101, which could result in blurring or black borders, a baffle 113 is installed in front of the camera 101. A third motor 112 drives the baffle 113, and the third motor 112 is electrically connected to the control unit. When the support rod 106 rotates along the axis of the base 111, the third motor 112 drives the baffle 113 to move in front of the camera 101. The third motor 112 is a miniature motor.

[0056] The above-described embodiments are merely preferred embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be covered within the protection scope of this utility model.

Claims

1. An adaptive video acquisition device, comprising a base (111) and a support rod (106), characterized in that, It also includes a sound source localization module, a video acquisition module, and a control unit; The sound source localization module includes several microphones (104), each microphone (104) is evenly distributed circumferentially along the support rod (106), and the distance between two adjacent microphones (104) satisfies d. <C / 2f max Where C is the speed of sound, f max The highest operating frequency of any microphone (104); The video acquisition module includes a camera (101), which is disposed at the end of the support rod (106); A rotatable connection assembly is provided between the strut (106) and the base (111), the rotatable connection assembly causing the strut (106) to rotate along the axis of the base (111), and A first motor (110) drives the strut (106) to rotate along the axis of the base (111). A baffle (113) is provided in front of the camera (101), and The third motor (112) drives the baffle (113), and the third motor (112) is electrically connected to the control unit. When the support rod (106) rotates along the axis of the base (111), the third motor (112) drives the baffle (113) to move in front of the camera (101). Each microphone (104), camera (101), and first motor (110) is electrically connected to the control unit.

2. The adaptive video acquisition device as described in claim 1, characterized in that, The base (111) is suspended from the top of the conference room or placed on the table. When the base (111) is placed on the table, the contact area between the base (111) and the table is provided with an anti-slip pad.

3. The adaptive video acquisition device as described in claim 1, characterized in that, Each microphone (104) is covered with a windproof cover.

4. The adaptive video acquisition device as described in claim 1, characterized in that, The rotating connection assembly includes a slide (109), the slide (109) and the base (111) are concentrically arranged, the support rod (106) is inserted in the slide (109), the first motor (110) is fixedly connected to the base (111), and the support rod (106) is provided with a first gear (108) that meshes with the drive wheel of the first motor (110).

5. The adaptive video acquisition device as described in claim 1, characterized in that, The ends of the camera (101) and the support rod (106) are hinged to the support (102). A second motor (103) is provided at the support (102). A second gear (107) that meshes with the drive wheel of the second motor (103) is provided at the lower part of the camera (101).

6. The adaptive video acquisition device as described in claim 1, characterized in that, The camera (101) is a wide-angle camera and has focusing and image stabilization functions.

7. The adaptive video acquisition device as described in claim 1, characterized in that, It also includes a fill light, which is set at the camera (101), and the control unit controls the intensity of the fill light according to the light intensity of the venue.

8. The adaptive video acquisition device as described in claim 5, characterized in that, The first motor (110) and the second motor (103) are servo motors or stepper motors.

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