Image acquisition module, electronic device and face image acquisition system

Abstract

The application provides an image acquisition module, an electronic device and a face image acquisition system, and relates to the technical field of image acquisition.The image acquisition module comprises an image sensor and a light source driving module;an output end of the image sensor is electrically connected with a first input end of the light source driving module, and the output end of the image sensor outputs a light-on control signal;an output end of the light source driving module is electrically connected with a light source;the image sensor is used for acquiring an image;and the light source driving module is used for driving the light source.In this way, the image acquisition module is used, the light-on control signal is issued and image acquisition are both performed by the image sensor, so that the control process of image acquisition is simplified;the light source driving module is controlled to light up the light source by the sensor outputting the light-on control signal, and the image acquisition is correspondingly matched with the image acquisition of the sensor, so that high-frame-rate image acquisition is realized.

Description

Technical Field

[0001] This application relates to the field of image acquisition technology, and in particular to an image acquisition module, electronic device and face image acquisition system. Background Technology

[0002] In related technologies, facial recognition systems typically employ a control platform that separately controls the camera and the light source driving module (e.g., Figure 1 As shown in the figure, the light source driving module further controls the lighting and extinguishing states and driving current of the supplementary lights (such as light source 1 and light source 2).

[0003] However, since the camera captures images and the control signals for driving the light source are issued independently by the control platform, there are many uncontrollable time factors, which may result in a low image capture frame rate. Utility Model Content

[0004] In view of the above problems, embodiments of this application provide an image acquisition module, an electronic device, and a face image acquisition system to overcome or at least partially solve the above problems.

[0005] A first aspect of this application discloses an image acquisition module, including: an image sensor and a light source driving module; The output terminal of the image sensor is electrically connected to the first input terminal of the light source driving module, and the output terminal of the image sensor outputs a lighting control signal; the output terminal of the light source driving module is electrically connected to the light source. The image sensor is used to acquire images; The light source driving module is used to drive the light source.

[0006] Optionally, the image sensor includes: an exposure control module and an image acquisition module; The first output terminal of the exposure control module is electrically connected to the first input terminal of the light source driving module, and the second output terminal of the exposure control module is electrically connected to the first input terminal of the image acquisition module. The first output terminal of the exposure control module outputs a light-up control signal, and the second output terminal of the exposure control module outputs an image acquisition control signal. The exposure control module is used to control the light source driving module and the image acquisition module; The image acquisition module is used for image acquisition.

[0007] Optionally, the image sensor further includes an image processing module; The input terminal of the image processing module is electrically connected to the output terminal of the image acquisition module; The first output terminal of the image processing module is electrically connected to the first input terminal of the exposure control module; The image processing module is used to determine the exposure code value of the image acquired by the image acquisition module and to send an exposure control signal to the exposure control module.

[0008] Optionally, the image sensor further includes a light source control register module; the light source control register module stores at least: the driving current value of the light source and / or light source state configuration information, the light source state configuration information being used to characterize whether the target state of the light source is lit; The output terminal of the light source control register module is electrically connected to the third input terminal of the light source drive module, and the output terminal of the light source control register module outputs the drive current value and / or light source status configuration information.

[0009] Optionally, the third output terminal of the exposure control module is electrically connected to the first input terminal of the light source control register module, and the third output terminal of the exposure control module outputs a drive current value adjustment signal.

[0010] Optionally, the image sensor further includes a control module; The first output terminal of the control module is electrically connected to the second input terminal of the exposure control module; The control module is used to provide the exposure control module with timing signals for controlling the light source driving module and timing signals for controlling the image acquisition module.

[0011] Optionally, the second output terminal of the control module is electrically connected to the input terminal of the control platform; The control module is used to obtain the current state of the image sensor and send it to the control platform.

[0012] Optionally, the image sensor further includes a communication interface; the input terminal of the communication interface is electrically connected to the output terminal of the light source control register module, and the output terminal of the communication interface is electrically connected to the second input terminal of the light source driving module.

[0013] A second aspect of this application discloses an electronic device, comprising: Control platform; The image acquisition module described in the first aspect of the embodiments of this application.

[0014] A third aspect of this application discloses a face image acquisition system, comprising: Control platform; The image acquisition module described in the first aspect of the embodiments of this application; A first light source and a second light source are respectively connected to the light source driving module. The polarization direction of the light emitted by the first light source is different from that of the light emitted by the second light source.

[0015] Optionally, the polarization direction of the light emitted by the first light source is the same as the polarization direction of the light received by the image acquisition module in the image sensor.

[0016] The embodiments of this application have the following advantages: In this embodiment, the image acquisition module includes an image sensor and a light source driving module. The output terminal of the image sensor is electrically connected to the first input terminal of the light source driving module. The output terminal of the image sensor outputs a lighting control signal, and the output terminal of the light source driving module is electrically connected to the light source. Thus, in this embodiment, both the lighting control signal transmission and image acquisition are handled by the image sensor, simplifying the image acquisition control process. By outputting the lighting control signal, the sensor automatically controls the light source driving module to illuminate the light source, matching this signal with its own image acquisition, thereby achieving high frame rate image acquisition. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a facial recognition system; Figure 2 This is a schematic diagram of an existing data acquisition driver scheme; Figure 3 This is a schematic diagram of an image acquisition module provided in an embodiment of this application; Figure 4 This is a schematic diagram of another image acquisition module provided in an embodiment of this application; Figure 5 This is a schematic diagram of another image acquisition module provided in the embodiments of this application; Figure 6 This is a schematic diagram of an electronic device provided in an embodiment of this application; Figure 7 This is a schematic diagram of a face image acquisition system provided in an embodiment of this application. Detailed Implementation

[0019] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] Facial recognition systems such as Figure 1 As shown, the system includes two light sources (light source 1 and light source 2) and a camera (face recognition camera). The light sources are used for polarized light face recognition. Specifically, one light source outputs 0° polarized light, and the other outputs 90° polarized light. The polarization direction of the camera is the same as that of one of the light sources, typically 0°. Both light sources emit infrared light. When light source 1 is lit, one image is captured; when light source 2 is lit, another image is captured. The two images are processed (e.g., subtracted) to obtain the 3D information or contour surface information of the face, thereby achieving face recognition.

[0021] like Figure 2 As shown, existing face recognition systems employ a control platform that separately controls the camera and the light source driver module (LED driver module). The light source driver module further controls the on / off state and driving current of the supplementary lights (such as light source 1 and light source 2). This approach may result in asynchronous control of the camera and light source driver, leading to inaccurate image acquisition (e.g., the image's exposure code value does not meet the required target code value, i.e., underexposure) or low frame rates due to delays between control signals, wasting time.

[0022] This application provides an image acquisition module, referring to... Figure 3 As shown, Figure 3 This is a schematic diagram of an image acquisition module provided in an embodiment of this application. Figure 3 As shown, the image acquisition module includes: an image sensor and a light source driving module; The output terminal of the image sensor is electrically connected to the first input terminal of the light source driving module, and the output terminal of the image sensor outputs a lighting control signal; the output terminal of the light source driving module is electrically connected to the light source; wherein, the image sensor is used to acquire images; and the light source driving module is used to drive the light source.

[0023] In this embodiment, the light source is used for supplementary lighting during image acquisition, and the lighting control signal is used to trigger the light source driving module to illuminate the light source, that is, to control the light source to be in an illuminated state during the lighting period. The output terminal of the image sensor is electrically connected to the first input terminal of the light source driving module, and the output terminal of the light source driving module is electrically connected to the light source. When the output terminal of the image sensor outputs the lighting control signal, the light source driving module responds to the lighting control signal and drives the light source to illuminate, so that the image sensor can perform image acquisition after the light source is in an illuminated and stable state.

[0024] In this system, there can be one or more light sources. The image sensor in the image acquisition module outputs a lighting control signal corresponding to the light source to control the light source driving module to illuminate the light source, thereby allowing the image sensor to acquire a number of images corresponding to the light source. Specifically, the image sensor sends a lighting control signal to the light source driving module through its output terminal to control the light source driving module to illuminate one light source. After the light source is illuminated and stable, the image sensor acquires an image. In the case of multiple light sources, the image sensor sequentially sends the lighting control signal corresponding to each light source to the light source driving module through its output terminal to control the light source driving module to illuminate each light source. After each light source is illuminated and stable, the image sensor acquires an image, ultimately acquiring a number of images corresponding to the light source.

[0025] For example, the light source includes a first light source and a second light source. The image sensor sends a lighting control signal corresponding to the first light source to the light source driving module through its output terminal to control the light source driving module to light up the first light source. After the first light source is lit and stable, the image sensor starts the first image acquisition. The image sensor sends a lighting control signal corresponding to the second light source to the light source driving module through its output terminal to control the light source driving module to light up the second light source. After the second light source is lit and stable, the image sensor starts the second image acquisition. In this way, the image acquisition module acquires two images corresponding to the number of light sources.

[0026] In the image acquisition module of this application embodiment, both the lighting control signal and the image acquisition are generated by the image sensor, which simplifies the image acquisition control process. The sensor outputs the lighting control signal to control the light source driving module to light up the light source, and matches it with its own image acquisition, thereby enabling high frame rate image acquisition.

[0027] In some embodiments, the image acquisition module may further include a lens. Light is first focused by the lens before being incident on the image sensor. The image sensor outputs a light-up control signal at the output terminal to control the light source driving module to light up the light source. After the light source is in a stable state, the image acquisition module performs image acquisition.

[0028] In one alternative embodiment, such as Figure 4 As shown, the image sensor includes: an exposure control module and an image acquisition module; The first output terminal of the exposure control module is electrically connected to the first input terminal of the light source driving module, and the second output terminal of the exposure control module is electrically connected to the first input terminal of the image acquisition module. The first output terminal of the exposure control module outputs a light-up control signal, and the second output terminal of the exposure control module outputs an image acquisition control signal. The exposure control module is used to control the light source driving module and the image acquisition module; the image acquisition module is used to acquire images.

[0029] In this embodiment, the lighting control signal is used to trigger the light source driving module to light up the light source, and the image acquisition control signal is used to trigger the image acquisition module to acquire images. The exposure control module sends the lighting control signal to the light source driving module through its first output terminal to control the light source driving module to light up the light source; and after the light source is lit and stable, the light control module sends the image acquisition control signal to the image acquisition module through its second output terminal to control the image acquisition module to acquire images.

[0030] During use, in order to acquire images that meet quality requirements (e.g., the code value of the image acquired by the image acquisition module reaches the target code value), the time interval between the lamp-on control signal output by the exposure control module through the first output terminal and the image acquisition control signal output through the second output terminal is not less than the target delay duration. Specifically, considering that controlling the light source to reach a stable state requires a certain response time, after the lamp-on control signal is output by the first output terminal of the exposure control module, the second output terminal of the exposure control module needs to wait for the target delay duration before outputting the image acquisition control signal to control the image acquisition module to perform image acquisition. The target delay duration can include the response time of the light source (i.e., the delay from outputting the lamp-on control signal to the light source lighting up, or the response time from the light source going from off to on); in some embodiments, the target delay duration also includes the delay from the light source lighting up to sending the image acquisition control signal, i.e., the delay from the light source lighting up to the start of image acquisition, to ensure that the light source state is stable during image acquisition.

[0031] The image acquisition module of this application embodiment can control the light source driving module to light up the light source by outputting a light-up control signal through the first output terminal and an image acquisition control signal through the second output terminal through the exposure control module in the image sensor, thereby matching its own image acquisition and achieving high frame rate image acquisition.

[0032] In one optional embodiment, the image sensor further includes an image processing module; The input terminal of the image processing module is electrically connected to the output terminal of the image acquisition module; The first output terminal of the image processing module is electrically connected to the first input terminal of the exposure control module; The image processing module is used to determine the exposure code value of the image acquired by the image acquisition module and to send an exposure control signal to the exposure control module.

[0033] During use, after the image acquisition module completes image acquisition, it can send the acquired image to the image processing module through the output terminal. The image processing module determines the exposure code value of the image acquired by the image acquisition module. If the exposure code value of the acquired image is not greater than the target code value (i.e., underexposure), the image processing module sends an exposure control signal to the exposure control module through the first output terminal, so that the exposure control module adjusts the control parameter values ​​of the image acquisition module or the light source driving module. As a result, the image acquisition module acquires an image with the adjusted exposure code value, which is greater than the target code value.

[0034] The control parameter value of the image acquisition module can be the exposure parameter value (e.g., exposure duration). When the exposure code value of the acquired image is not greater than the target code value, the image processing module sends an exposure control signal to the exposure control module through the first output terminal. The exposure control module can adjust the exposure parameter value of the image acquisition module so that the image acquisition module can acquire an image with the adjusted exposure code value.

[0035] The control parameter values ​​of the light source driving module can be the control parameter values ​​of the light source brightness (e.g., the driving current value). When the exposure code value of the acquired image is not greater than the target code value, the image processing module sends an exposure control signal to the exposure control module through the first output terminal. The exposure control module can control the brightness of the light source by adjusting the control parameter values, so that the image acquisition module can acquire an image with the adjusted exposure code value.

[0036] The image acquisition module of this application combines the image processing module and the exposure control module to automatically adjust the image exposure code value, ensuring that the acquired image quality is good and that there is no problem of underexposure.

[0037] In one optional embodiment, the image sensor further includes a light source control register module; the light source control register module stores at least: the driving current value of the light source and / or light source state configuration information, the light source state configuration information being used to characterize whether the target state of the light source is a lit state; The output terminal of the light source control register module is electrically connected to the third input terminal of the light source drive module, and the output terminal of the light source control register module outputs the drive current value and / or light source status configuration information.

[0038] In this embodiment, the brightness of the light source is related to the driving current value, that is, different driving current values ​​correspond to different light source brightness. The driving current value of the light source can be stored in the light source control register module. When the image acquisition module is used for image acquisition, the light source driving module reads the driving current value from the light source control register module to drive the light source.

[0039] The light source control register module can also store light source status configuration information. When the image acquisition module is used for image acquisition, the light source driver module reads the light source status configuration information from the light source control register module and determines the target status of the light source based on the light source status configuration information. The light source can only be lit if the target status of the light source is lit. Specifically, when the light source driver module determines that the target status of the light source is lit based on the read light source status configuration information, the light source driver module waits for a lighting control signal. If a lighting control signal is received, the light source is controlled to be lit during the lighting period (where the brightness of the light source is determined based on the driving current value). If the target status of the light source is off (not lit), the light source is controlled to be off during the non-lighting periods other than the lighting period.

[0040] Furthermore, the third output terminal of the exposure control module is electrically connected to the first input terminal of the light source control register module, and the third output terminal of the exposure control module outputs a drive current value adjustment signal.

[0041] In this embodiment, the brightness of the light source is related to the driving current value, and the brightness of the light source can be adjusted by adjusting the driving current value. Specifically, when the exposure code value of the acquired image is not greater than the target code value, the exposure control module responds to the exposure control signal sent by the image processing module and outputs a driving current value adjustment signal through the third output terminal to adjust the driving current value in the light source control register module. The light source driving module reads the adjusted driving current value from the light source control register module to drive the light source, thereby adjusting the brightness of the light source and ensuring that the acquired image quality is good and that underexposure does not occur.

[0042] The image acquisition module of this application combines a light source control register module, an image processing module, and an exposure control module to adjust the driving current of the light source, thereby adjusting the brightness of the light source and automatically adjusting the exposure code value of the image, thus acquiring a high-quality image.

[0043] In one optional embodiment, the image sensor further includes a control module; The first output terminal of the control module is electrically connected to the second input terminal of the exposure control module; The control module is used to provide the exposure control module with timing signals for controlling the light source driving module and timing signals for controlling the image acquisition module.

[0044] In this embodiment, considering that controlling the light source to reach a stable state requires a certain response time, to ensure that the light source is lit and stable when the image acquisition module starts image acquisition, the control module provides timing signals for controlling the light source driving module and the image acquisition module to the exposure control module. This controls the timing of sending the lighting control signal and the image control signal, ensuring that the image acquisition module is controlled to acquire images only when the light source is lit and stable. In this way, high-quality images can be acquired.

[0045] In one optional embodiment, the second output terminal of the control module is electrically connected to the input terminal of the control platform; the control module is used to obtain the current state of the image sensor and send it to the control platform.

[0046] In this embodiment, the image sensor's state includes at least a working mode and a sleep mode. When image acquisition is required, the image sensor enters the working mode, and when image acquisition is completed or no image acquisition is required, the image sensor enters the sleep mode.

[0047] The control platform is used to control the state of the image sensor. For example, it can control the image sensor to enter either a working mode or a sleep mode. The control module feeds back the current state of the image sensor to the control platform, allowing the platform to better control the sensor's state.

[0048] In one optional embodiment, the image sensor further includes a communication interface; the input terminal of the communication interface is electrically connected to the output terminal of the light source control register module, and the output terminal of the communication interface is electrically connected to the second input terminal of the light source driving module.

[0049] In this application embodiment, the communication interface may be an IIC (Inter-Integrated Circuit, a serial communication protocol) communication interface or a URAT (Universal Asynchronous Receiver Transmitter) serial port, or other protocol communication interfaces. This application does not limit this.

[0050] like Figure 5As shown, Figure 5 This application provides another schematic diagram of an image acquisition module. Specifically, the image acquisition module includes an image sensor and a light source driving module. The image sensor includes an exposure control module, an image acquisition module, an image processing module, a light source control register module, a control module, a communication interface, an image output module, and a control register module.

[0051] Specifically, the first output terminal of the exposure control module is electrically connected to the first input terminal of the light source driving module; the second output terminal of the exposure control module is electrically connected to the first input terminal of the image acquisition module; and the third output terminal of the exposure control module is electrically connected to the first input terminal of the light source control register module. The input terminal of the image processing module is electrically connected to the output terminal of the image acquisition module, and the first output terminal of the image processing module is electrically connected to the first input terminal of the exposure control module. The output terminal of the light source control register module is electrically connected to the third input terminal of the light source driving module. The first output terminal of the control module is electrically connected to the second input terminal of the exposure control module, and the second output terminal of the control module is electrically connected to the input terminal of the control platform. The input terminal of the communication interface is electrically connected to the output terminal of the light source control register module, and the output terminal of the communication interface is electrically connected to the second input terminal of the light source driving module.

[0052] The image acquisition module performs image acquisition as follows: First, the control platform can initialize and configure the image sensor through the control register module. For example, it can configure the light source status configuration information and the driving current of the light source in the light source controller register module. Specifically, the control platform can send configuration information (e.g., light source status configuration information and the driving current value of the light source) to the control register module through the communication interface. After receiving the configuration information, the control register module configures the configuration information (e.g., light source status configuration information and the driving current value of the light source) to the light source controller register module.

[0053] During image acquisition, the light source driving module reads the light source status configuration information and the light source drive current value from the light source control register module via the communication interface. If the light source driving module determines that the target state of the light source is lit based on the light source status configuration information, it waits for the exposure control module to send a lighting control signal. Upon receiving the lighting control signal, it controls the light source to remain lit during the lighting period based on the drive current value. Then, after the light source is lit and stable, the exposure control module outputs an image acquisition control signal to control the image acquisition module to start image acquisition. The timing of the exposure control module sending the lighting control signal to the light source driving module and the timing of the exposure control module sending the image acquisition control signal to the image acquisition module are determined based on the timing signals sent by the control module.

[0054] After completing image acquisition, the image acquisition module sends the acquired image to the image processing module. The image processing module calculates the exposure code value of the acquired image and outputs the acquired image through the image output module if the exposure code value reaches the target code value. If the exposure code value does not reach the target code value, the image processing module sends an exposure control signal to the exposure control module, so that the exposure control module adjusts the control parameter values ​​of the image acquisition module or the light source driving module, thereby enabling the image acquisition module to acquire an image with the adjusted exposure code value, which is greater than the target code value.

[0055] Specifically, one method of adjusting control parameter values ​​is as follows: the exposure control module sends a drive current value adjustment signal to the light source control register to adjust the drive current value stored in the light source control register module. The light source driving module then reads the adjusted drive current value from the light source control register module and drives the light source according to the adjusted drive current value, so that the image acquisition module can acquire an image with the adjusted exposure code value. Another method of adjusting control parameter values ​​is as follows: the exposure control module adjusts the exposure parameter values ​​and controls the image acquisition module to acquire images according to the adjusted exposure parameter values, so as to acquire an image with the adjusted exposure code value.

[0056] In the image acquisition module of this application embodiment, both the sending of the lighting control signal and the image acquisition are performed by the image sensor, thus simplifying the control process of image acquisition. The image sensor controls the light source driving module to light up the light source and matches it with its own image acquisition, thereby achieving high frame rate image acquisition. Furthermore, if the exposure code value of the image does not reach the target code value (i.e., underexposure), the control parameters can be adjusted by the exposure control module to automatically adjust the exposure code value of the image, thereby acquiring a high-quality image.

[0057] This application also provides an electronic device, see embodiments thereof. Figure 6 As shown, Figure 6 This is a schematic diagram of an electronic device provided in an embodiment of this application. The electronic device includes: Control platform; The image acquisition module provided in the above embodiments.

[0058] In this embodiment, the electronic device can be a portable or mobile terminal such as a smartphone, tablet, or gaming device, as well as other electronic devices such as smart door locks, car control platforms, and bank ATMs. The control platform can be the processor of the electronic device, such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit).

[0059] The state of the image acquisition module (working mode or sleep mode) is controlled by the control platform. For example, when image acquisition is required, the control platform sends a start signal to control the image acquisition module to enter the working mode. Thus, the image sensor in the image acquisition module can automatically control the light source driver module to light up the light source, matching its own image acquisition to achieve high frame rate image acquisition. After image acquisition is completed, the control platform sends a sleep signal to control the image acquisition module to enter the sleep mode. Then, the image acquisition module waits for the next start signal from the control platform to re-enter the working mode.

[0060] In some embodiments, the light source may be located on an electronic device. When an image is acquired by the electronic device, the exposure control module of the image sensor sends a lighting control signal to the light source driving module to control the light source driving module to light up the light source. After the light source is lit and stable, the image acquisition module is controlled to start image acquisition.

[0061] The electronic device using the embodiments of this application can simplify the control process of image acquisition. The control platform only needs to control the state of the image acquisition module to trigger the image sensor in the image acquisition module to control the light source driving module to light up the light source and match it with its own image acquisition to achieve high frame rate image acquisition. Since the light-up control signal and image acquisition are both sent by the image sensor, acquisition can begin after the light source is in a stable state. Therefore, the acquired image quality is good and there will be no problem of underexposure.

[0062] This application also provides a face image acquisition system, referring to... Figure 7 As shown, Figure 7 This is a schematic diagram of a face image acquisition system provided in an embodiment of this application. The face image acquisition system includes: Control platform; The image acquisition module provided in the above embodiments; A first light source and a second light source are respectively connected to the light source driving module. The polarization direction of the light emitted by the first light source is different from that of the light emitted by the second light source.

[0063] In this embodiment of the application, the control platform is used to control the state of the image acquisition module. For example, the image acquisition module enters the working mode according to the start signal from the control platform, and / or enters the sleep mode according to the sleep signal from the control platform.

[0064] In this system, both the first and second light sources can be infrared light sources. The polarization direction of the light emitted by the first light source refers to the angular direction of the polarized light output by the first light source, and the polarization direction of the light emitted by the second light source refers to the angular direction of the polarized light output by the second light source. For example, the polarization direction of the light emitted by the first light source may be 0 degrees, while the polarization direction of the light emitted by the second light source may be different from that of the first light source, such as 90 degrees or other angles.

[0065] Furthermore, the polarization direction of the light emitted by the first light source is the same as the polarization direction of the light received by the image acquisition module in the image sensor.

[0066] In this embodiment, a polarization device is provided inside the image acquisition module. The polarization direction of the light is the polarization direction of the light received by the image acquisition module. The polarization device can be set in the image sensor or in the optical path guiding structure above the image sensor (e.g., inside or below the lens).

[0067] During operation, the control platform sends a start signal to activate the image acquisition module, putting it into working mode. The exposure control module in the image sensor sends a lighting control signal to the light source drive module to illuminate the first light source. Once the first light source is illuminated and stable, the image acquisition module acquires a face image. Next, the control module deactivates the first light source, and the exposure control module sends a lighting control signal to the light source drive module to illuminate the second light source. Once the second light source is illuminated and stable, the image acquisition module acquires another face image. Based on these two face images, 3D information or the contour surface information of the face can be obtained, thus achieving face recognition. Face recognition can include face matching and / or authenticity verification.

[0068] The face image acquisition system using the embodiments of this application can simplify the control process of face image acquisition. The control platform only needs to control the state of the image acquisition module to trigger the image sensor to automatically control the light source driving module to light up the first light source and the second light source, and match them with its own image acquisition to achieve high frame rate face image acquisition, thereby achieving fast face recognition.

[0069] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0070] This application describes embodiments of methods and apparatus according to flowchart illustrations and / or block diagrams. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0071] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0072] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal equipment, causing a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable terminal equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0073] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0074] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0075] The above provides a detailed description of the image acquisition module, electronic device, and face image acquisition system provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An image acquisition module, characterized in that, include: Image sensor and light source driving module; The output terminal of the image sensor is electrically connected to the first input terminal of the light source driving module, and the output terminal of the image sensor outputs a lighting control signal; the output terminal of the light source driving module is electrically connected to the light source. The image sensor is used to acquire images; The light source driving module is used to drive the light source.

2. The image acquisition module according to claim 1, characterized in that, The image sensor includes: an exposure control module and an image acquisition module; The first output terminal of the exposure control module is electrically connected to the first input terminal of the light source driving module, and the second output terminal of the exposure control module is electrically connected to the first input terminal of the image acquisition module. The first output terminal of the exposure control module outputs a light-up control signal, and the second output terminal of the exposure control module outputs an image acquisition control signal. The exposure control module is used to control the light source driving module and the image acquisition module; The image acquisition module is used for image acquisition.

3. The image acquisition module according to claim 2, characterized in that, The image sensor also includes an image processing module; The input terminal of the image processing module is electrically connected to the output terminal of the image acquisition module; The first output terminal of the image processing module is electrically connected to the first input terminal of the exposure control module; The image processing module is used to determine the exposure code value of the image acquired by the image acquisition module and to send an exposure control signal to the exposure control module.

4. The image acquisition module according to claim 2 or 3, characterized in that, The image sensor also includes a light source control register module; the light source control register module stores at least: the driving current value of the light source and / or light source state configuration information, the light source state configuration information being used to characterize whether the target state of the light source is lit. The output terminal of the light source control register module is electrically connected to the third input terminal of the light source drive module, and the output terminal of the light source control register module outputs the drive current value and / or light source status configuration information.

5. The image acquisition module according to claim 4, characterized in that, The third output terminal of the exposure control module is electrically connected to the first input terminal of the light source control register module, and the third output terminal of the exposure control module outputs a drive current value adjustment signal.

6. The image acquisition module according to claim 2, characterized in that, The image sensor also includes a control module; The first output terminal of the control module is electrically connected to the second input terminal of the exposure control module; The control module is used to provide the exposure control module with timing signals for controlling the light source driving module and timing signals for controlling the image acquisition module.

7. The image acquisition module according to claim 6, characterized in that, The second output terminal of the control module is electrically connected to the input terminal of the control platform; The control module is used to obtain the current state of the image sensor and send it to the control platform.

8. The image acquisition module according to claim 4, characterized in that, The image sensor also includes a communication interface; the input terminal of the communication interface is electrically connected to the output terminal of the light source control register module, and the output terminal of the communication interface is electrically connected to the second input terminal of the light source driving module.

9. An electronic device, characterized in that, include: Control platform; The image acquisition module according to any one of claims 1-8.

10. A face image acquisition system, characterized in that, include: Control platform; The image acquisition module according to any one of claims 1-8; A first light source and a second light source are respectively connected to the light source driving module. The polarization direction of the light emitted by the first light source is different from that of the light emitted by the second light source.

11. The face image acquisition system according to claim 10, characterized in that, The polarization direction of the light emitted by the first light source is the same as the polarization direction of the light received by the image acquisition module in the image sensor.

Images