WO2023273323A1 - 一种对焦方法和电子设备 - Google Patents

一种对焦方法和电子设备 Download PDF

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Publication number
WO2023273323A1
WO2023273323A1 PCT/CN2022/073333 CN2022073333W WO2023273323A1 WO 2023273323 A1 WO2023273323 A1 WO 2023273323A1 CN 2022073333 W CN2022073333 W CN 2022073333W WO 2023273323 A1 WO2023273323 A1 WO 2023273323A1
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WIPO (PCT)
Prior art keywords
frame
electronic device
preview
preview image
camera
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Application number
PCT/CN2022/073333
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English (en)
French (fr)
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WO2023273323A9 (zh
Inventor
林梦然
冯寒予
朱聪超
Original Assignee
荣耀终端有限公司
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Application filed by 荣耀终端有限公司 filed Critical 荣耀终端有限公司
Priority to US18/266,987 priority Critical patent/US20240056683A1/en
Priority to CN202280030066.8A priority patent/CN117356103A/zh
Priority to CN202410091182.1A priority patent/CN117857920A/zh
Priority to EP22831157.7A priority patent/EP4243396A1/en
Publication of WO2023273323A1 publication Critical patent/WO2023273323A1/zh
Publication of WO2023273323A9 publication Critical patent/WO2023273323A9/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/62—Control of parameters via user interfaces
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/61—Control of cameras or camera modules based on recognised objects
    • H04N23/611—Control of cameras or camera modules based on recognised objects where the recognised objects include parts of the human body
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/63—Control of cameras or camera modules by using electronic viewfinders
    • H04N23/631—Graphical user interfaces [GUI] specially adapted for controlling image capture or setting capture parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/63—Control of cameras or camera modules by using electronic viewfinders
    • H04N23/631—Graphical user interfaces [GUI] specially adapted for controlling image capture or setting capture parameters
    • H04N23/632—Graphical user interfaces [GUI] specially adapted for controlling image capture or setting capture parameters for displaying or modifying preview images prior to image capturing, e.g. variety of image resolutions or capturing parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/63—Control of cameras or camera modules by using electronic viewfinders
    • H04N23/633—Control of cameras or camera modules by using electronic viewfinders for displaying additional information relating to control or operation of the camera
    • H04N23/635—Region indicators; Field of view indicators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/67—Focus control based on electronic image sensor signals
    • H04N23/673—Focus control based on electronic image sensor signals based on contrast or high frequency components of image signals, e.g. hill climbing method
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/67—Focus control based on electronic image sensor signals
    • H04N23/675—Focus control based on electronic image sensor signals comprising setting of focusing regions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
    • H04N23/681—Motion detection
    • H04N23/6812—Motion detection based on additional sensors, e.g. acceleration sensors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
    • H04N23/682—Vibration or motion blur correction
    • H04N23/685—Vibration or motion blur correction performed by mechanical compensation
    • H04N23/687—Vibration or motion blur correction performed by mechanical compensation by shifting the lens or sensor position

Definitions

  • the solution relates to the field of electronic technology, in particular to an automatic focus (AF) method and electronic equipment.
  • AF automatic focus
  • camera applications are one of the most important applications on electronic devices such as mobile phones and tablets. Users can record and share pictures and videos through camera applications on electronic devices. At present, users have higher and higher requirements for camera experience.
  • the electronic device can focus on the subject in the picture. As the subject changes, the focus frame will also change, so that it can adapt to the change of the subject and make the image clear. For example, when a human face is displayed in the camera picture, the electronic device can recognize the face and automatically focus on the face in the picture, and when the face in the camera picture suddenly disappears or changes, the electronic device can focus Adjust the frame to the center of the screen.
  • the embodiment of the present application discloses a focusing method and an electronic device, which can improve the stability of a focusing image.
  • the embodiment of the present application discloses a focusing method, including: in response to the first operation, the electronic device starts shooting, and displays a first interface, and the first interface displays a preview image collected by the camera; At this moment, the electronic device displays a preview image of the Kth frame on the first interface, and the preview image of the Kth frame is collected by the camera with the face of the first target as the first focusing frame; In the K-frame preview screen, the face of the first target meets the preset face recognition conditions; at the second moment, the electronic device displays the M-th frame preview screen on the first interface, and the M-th frame preview The picture is captured by the camera focusing on the first focusing frame; in the Mth frame preview picture, the face of the first target does not meet the preset face recognition conditions; the The second moment is after the first moment; the number of frames between the preview image of the Mth frame and the preview image of the Kth frame is less than or equal to the preset threshold A; the K, M, and A are all positive integer.
  • the process of determining whether the face of the first target meets the preset face recognition conditions can be referred to as the judgment process of the target frame, that is, the target frame is the face frame, and the first operation is the user opening the camera application.
  • the value of A can refer to the description in S101.
  • the exit from the focus frame can be delayed, the frequent changes of the focus target in the preview screen can be reduced, and the presence of a certain target in the viewfinder frame can be reduced.
  • the number of clear and unclear picture changes can be presented in the middle, so as to improve the stability of the focusing picture and improve the user experience.
  • the preset face recognition condition includes that the face frame of the first target is greater than a first threshold, and/or, the center point of the face frame is at the center of the preview image.
  • An edge range where the edge range is a predetermined range of the edge of the preview image.
  • the method of judging whether the preset face recognition conditions are met can specifically refer to the method of whether the face exists in the viewfinder frame, that is, the method of judging whether the target can be detected according to the size and/or position of the target frame.
  • the method further includes: the method further includes: at a third moment, the electronic device displays a Wth frame preview image on the first interface, and the Wth frame preview image It is collected by the camera focusing on the central focus frame; in the Wth frame preview screen, the face of the first target does not meet the preset face recognition conditions; the third The moment is after the first moment; in the preview image between the Wth frame preview image and the Kth frame preview image, none of the faces of the first target conforms to the preset face recognition Condition: the number of frames between the preview image of the Wth frame and the preview image of the Kth frame is greater than the preset threshold A; the W is a positive integer.
  • the electronic device displays the preview image of frame W on the first interface, which specifically includes: at the third moment, the electronic device detects the preview image of frame A before the third moment ; in the case that the faces of the preview pictures of the continuous A frames do not conform to the preset face recognition, the electronic device determines the target position based on the central focus frame, and adjusts the focal length of the camera through a motor, The Wth frame of the preview image is captured by the camera, and the target position is the motor position of the central focusing frame; the electronic device displays the Wth frame of the preview image.
  • the electronic device determines the target position based on the central focusing frame, adjusts the focal length of the camera through a motor, and collects the Wth preview image through the camera, specifically including: when the When the distance between the target position and the current motor position is greater than a second threshold, adjust the focal length of the camera multiple times through the motor, and collect the Wth preview image through the camera.
  • the electronic device needs to adjust the focus, when the focus distance is too large, the focus can be divided into multiple times, and the position of the focus frame of the preview screen moves smoothly, thereby improving user experience.
  • the electronic device determines the target position based on the central focusing frame, adjusts the focal length of the camera through a motor, and collects the Wth preview image through the camera, specifically including: when the When the distance between the target position and the current motor position is not greater than a second threshold, the focal length of the camera is adjusted once by the motor, and the Wth preview image is collected by the camera.
  • the method further includes: at a fourth moment, the electronic device displays an S-th frame preview image on the first interface, and the S-th frame preview image is the The first focus frame is collected by focusing; in the preview screen of the Sth frame, the face of the first target does not meet the preset face recognition conditions; the fourth moment is at the first frame After a moment; the continuous B-frame preview images before the K-th frame preview image all meet the preset face recognition conditions; the preview images between the S-th frame preview image and the K-th frame preview image Among them, the faces of the first target do not all meet the preset face recognition conditions; the number of frames between the S-th frame preview picture and the K-th frame preview picture is less than or equal to the preset threshold A+C frame; the S, B, and C are all positive integers.
  • the electronic device can check whether the preview images of the continuous B frames before the A frame all meet the preset face recognition conditions. .
  • the method further includes: the electronic device displays the K-th frame preview image on the first interface, specifically including: at the fifth moment, when the face posture angle yaw is greater than the first angle , the electronic device displays a K-th preview image on the first interface, and the ratio of the height to width of the first focus frame in the K-th preview image is smaller than the ratio of the height to width of the focus frame in the previous preview image,
  • the face posture angle yaw is the angle at which the head of a person rotates up and down; at the sixth moment, when the face posture angle pitch is greater than the second angle, the electronic device displays the K-th preview screen on the first interface, so
  • the ratio of the height to width of the first focus frame in the Kth preview image is greater than the ratio of height to width of the focus frame in the previous preview image
  • the face posture angle pitch is the angle at which a person's head turns left and right.
  • the embodiment of the present application discloses an electronic device, including: a touch screen, a camera, one or more processors, and one or more memories, the one or more memories are used to store computer program codes, and the computer
  • the program code includes computer instructions, and when the one or more processors execute the computer instructions, the electronic device executes: responding to a first operation, start shooting, display a first interface, and the first interface displays The preview picture collected by the camera; at the first moment, the Kth frame preview picture is displayed on the first interface, and the Kth frame preview picture is collected by the camera with the face of the first target as the first focusing frame received; in the Kth frame preview screen, the face of the first target meets the preset face recognition conditions; at the second moment, the Mth frame preview screen is displayed on the first interface, and the first target
  • the M-frame preview image is captured by the camera focusing on the first focus frame; in the M-th frame preview image, the face of the first target does not meet the preset face recognition conditions ;
  • the second moment is after the first moment
  • the process of determining whether the face of the first target meets the preset face recognition conditions can be referred to as the judgment process of the target frame, that is, the target frame is the face frame, and the first operation is the user opening the camera application.
  • the value of A can refer to the description in S101.
  • the exit from the focus frame can be delayed, the frequent changes of the focus target in the preview screen can be reduced, and the presence of a certain target in the viewfinder frame can be reduced.
  • the number of clear and unclear picture changes can be presented in the middle, so as to improve the stability of the focusing picture and improve the user experience.
  • the preset face recognition condition includes that the face frame of the first target is greater than a first threshold, and/or, the center point of the face frame is at the center of the preview image.
  • An edge range where the edge range is a predetermined range of the edge of the preview image.
  • the method of judging whether the preset face recognition conditions are met can specifically refer to the method of whether the face exists in the viewfinder frame, that is, the method of judging whether the target can be detected according to the size and/or position of the target frame.
  • the electronic device further executes: at the third moment, displaying the Wth frame of the preview image on the first interface, the Wth frame of the preview image is that the camera focuses on the center frame is focused; in the Wth frame preview screen, the face of the first target does not meet the preset face recognition conditions; the third moment is after the first moment; In the preview picture between the preview picture of the Wth frame and the preview picture of the Kth frame, the faces of the first target do not meet the preset face recognition conditions; the preview picture of the Wth frame The number of frames between the preview frame and the Kth frame is greater than the preset threshold A; the W is a positive integer.
  • the electronic device displays the preview image of frame W on the first interface, and specifically executes: at the third moment, detecting the preview image of frame A before the third moment; In the case that none of the faces in the preview images of consecutive A frames conform to the preset face recognition, the target position is determined based on the center focusing frame, the focal length of the camera is adjusted by a motor, and the camera captures the first W frame preview screen, the target position is the motor position of the center focusing frame; displaying the Wth frame preview screen.
  • the electronic device determines the target position based on the central focusing frame, adjusts the focal length of the camera through a motor, and collects the Wth preview image through the camera, specifically performing: when the When the distance between the target position and the current motor position is greater than a second threshold, adjust the focal length of the camera multiple times through the motor, and collect the Wth preview image through the camera.
  • the electronic device needs to adjust the focus, when the focus distance is too large, the focus can be divided into multiple times, and the position of the focus frame of the preview screen moves smoothly, thereby improving user experience.
  • the electronic device determines the target position based on the central focusing frame, adjusts the focal length of the camera through a motor, and collects the Wth preview image through the camera, specifically performing: when the When the distance between the target position and the current motor position is not greater than a second threshold, the focal length of the camera is adjusted once by the motor, and the Wth preview image is collected by the camera.
  • the electronic device further executes: at the fourth moment, displaying an S-th frame preview image on the first interface, where the S-th frame preview image is the Collected by the focus frame for focusing; in the preview screen of the Sth frame, the face of the first target does not meet the preset face recognition conditions; the fourth moment is after the first moment ;
  • the continuous B-frame preview images before the K frame preview image all meet the preset face recognition conditions; in the preview image between the S frame preview image and the K frame preview image, all None of the faces of the first target meet the preset face recognition conditions;
  • the number of frames between the S-th frame preview image and the K-th frame preview image is less than or equal to the preset threshold A+C frame; the S, B, and C are all positive integers.
  • the electronic device can check whether the preview images of the continuous B frames before the A frame all meet the preset face recognition conditions. .
  • the electronic device displays a preview image of the Kth frame on the first interface, and specifically executes: at the fifth moment, when the face posture angle yaw is greater than the first angle, at the An interface displays the Kth preview picture, the ratio of the height and width of the first focus frame in the K preview picture is less than the ratio of the height and width of the focus frame in the previous preview picture, and the facial posture angle yaw is the head of the person The angle of the upper and lower rotation; at the sixth moment, when the face posture angle pitch is greater than the second angle, the Kth preview screen is displayed on the first interface, and the height and width of the first focusing frame in the Kth preview screen The ratio of is greater than the ratio of the height and width of the focusing frame in the previous preview image, and the face posture angle pitch is the angle at which the head of the person turns left and right.
  • the aspect ratio of the first focus frame can be adjusted according to the rotation of the face
  • the present application provides an electronic device, including a touch screen, a camera, one or more processors, and one or more memories.
  • the one or more processors are coupled with a touch screen, a camera, and one or more memories, and the one or more memories are used to store computer program codes.
  • the computer program codes include computer instructions.
  • the present application provides an electronic device, including: one or more functional modules.
  • One or more functional modules are used to execute the focusing method in any possible implementation manner of any of the above aspects.
  • an embodiment of the present application provides a computer storage medium, including computer instructions, which, when the computer instructions are run on an electronic device, cause the computer device to execute the focusing method in any possible implementation of any one of the above aspects.
  • an embodiment of the present application provides a computer program product, which, when the computer program product is run on a computer, causes the computer to execute the focusing method in any possible implementation manner of any one of the above aspects.
  • FIG. 1 is a schematic diagram of a group of focus preview interfaces shown in an embodiment of the present application
  • Fig. 2 is a schematic diagram of a group of focus preview interfaces shown in the embodiment of the present application
  • Fig. 3 is a schematic diagram of a group of face focusing preview interfaces shown in the embodiment of the present application.
  • Fig. 4 is a schematic diagram of a group of focus preview interfaces shown in the embodiment of the present application.
  • Fig. 5 is a schematic diagram of a group of focus preview interfaces shown in the embodiment of the present application.
  • Fig. 6 is a schematic diagram of a group of focus preview interfaces shown in the embodiment of the present application.
  • Fig. 7 is a schematic diagram of a group of focus preview interfaces shown in the embodiment of the present application.
  • Fig. 8 is a schematic diagram of a group of focus preview interfaces shown in the embodiment of the present application.
  • Fig. 9 is a schematic diagram of a group of focus preview interfaces shown in the embodiment of the present application.
  • Fig. 10 is a schematic diagram of a group of focus preview interfaces shown in the embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of an electronic device 100 shown in an embodiment of the present application.
  • FIG. 12 is a software structural block diagram of an electronic device 100 shown in an embodiment of the present application.
  • FIG. 13 is a schematic flowchart of a focusing method shown in an embodiment of the present application.
  • Fig. 14 is a schematic diagram of a focus preview interface shown in the embodiment of the present application.
  • Fig. 15 is a schematic diagram of the focusing situation of a group of continuous multi-frame preview images shown in the embodiment of the present application;
  • FIG. 16 is a schematic flowchart of another focusing method shown in the embodiment of the present application.
  • FIG. 17 is a schematic flowchart of another focusing method shown in the embodiment of the present application.
  • Fig. 18 is a schematic diagram of another attitude angle when the face is turned according to the embodiment of the present application.
  • FIG. 19 is a schematic flowchart of another focusing method shown in the embodiment of the present application.
  • FIG. 20 is a schematic flowchart of another focusing method shown in the embodiment of the present application.
  • Embodiments of the present application provide a focusing method and an electronic device.
  • the time to exit focus can be delayed based on the position and/or size of the focus frame in the preview screen.
  • the length of the focus frame in the corresponding direction can be adjusted according to the head rotation posture angle.
  • the electronic device can judge whether to delay exiting the focusing time according to the position and/or size of the focusing frame in the preview image, which can improve the stability of focusing.
  • Focusing refers to the process in which the camera makes the image of the object clear by adjusting the object distance and focal length.
  • the electronic device obtains the highest picture frequency component by adjusting the position of the focusing lens, so as to obtain a higher picture contrast.
  • focusing is a process of continuous accumulation.
  • the electronic device compares the contrast of pictures taken by the lens at different positions, so as to obtain the position of the lens when the contrast of the picture is maximum, and then determine the focal length of the focus.
  • focusing mainly involves components such as lens, motor, motor driving chip and image sensor (sensor) of the camera module.
  • a lens (lens) is used to receive light, and an electronic device may include one or more lenses.
  • a lens can generally consist of one or several lenses.
  • Image sensors convert the light passing through the lens into electrical signals, which are then converted into digital signals.
  • the motor is used to push the lens to adjust the position.
  • the motor drive is used to determine where the motor pushes the lens when autofocusing.
  • the lens and photosensitive chip are the main components of imaging, and the motor and motor driver chip are the main components of focusing.
  • the lens and photosensitive chip are the main components of imaging
  • the motor and motor driver chip are the main components of focusing.
  • the electronic device camera module the electronic device needs to drive the lens through a motor, so that the distance between the lens and the photosensitive chip (focal length) and the distance between the lens and the subject (object distance) change.
  • Common focusing types can be divided into three types, phase detection auto focus (PDAF), contrast detection auto focus (CDAF) and laser detection auto focus (LDAF).
  • PDAF phase detection auto focus
  • CDAF contrast detection auto focus
  • LDAF laser detection auto focus
  • Phase focusing is a focusing method that detects the left and right pairs of pixels in the image sensor and the amount of light entering the object in the scene, compares the relevant values on the left and right sides, finds the focus point, and pushes the motor of the lens to the corresponding position. .
  • Contrast focusing also known as contrast focusing, is a process of moving the lens to achieve the freshest focusing process for the image in the focus area.
  • the motor When the camera is aimed at the subject, the motor will push the lens from the bottom to the top. During this process, the image sensor will record the contrast value such as contrast and find the position with the highest contrast. The motor pushes the lens moving to the top to the position with the greatest contrast to complete the final focusing.
  • Contrast focusing can be understood as first recording the contrast of all image information, and then pushing the motor.
  • Laser focus is to emit low-power laser light to the object to be photographed through the infrared laser sensor next to the camera, which is received by the sensor after reflection and calculates the distance to the object to be photographed.
  • the inter-lens motor directly pushes the lens to the corresponding position to complete the focusing.
  • the embodiment of the present application introduces a focusing method with reference to the accompanying drawings, by which an electronic device can focus on a target when shooting.
  • Targets can include human faces, animals, objects, etc.
  • the user does not need to tap the screen to focus, the electronic device can determine the target and automatically adjust the focus frame.
  • the electronic device does not need to be operated by the user, which improves the user experience.
  • Fig. 1 shows a schematic diagram of a group of focused preview interfaces.
  • the electronic device may have a page 10 on which application icons are placed, and the page includes a plurality of application icons 101 (for example, a weather application icon , calculator app icon, settings app icon, mail app icon, music app icon, video app icon, gallery app icon, camera app icon, etc.).
  • a page indicator is also displayed under the multiple application icons to indicate the positional relationship between the currently displayed page and other pages.
  • Below the page indicator there are multiple tray icons (such as a dialer application icon, a message application icon, and a contacts application icon), and the tray icons remain displayed when the page is switched.
  • the above-mentioned page may also include multiple application icons and page indicators, and the page indicator may not be a part of the page, but exists independently.
  • the above-mentioned picture icons are also optional, which is not limited in this embodiment of the present application.
  • the electronic device 100 may receive a user's input operation (for example, click) on the camera icon of the camera application, and in response to the input operation, the electronic device 100 may display the shooting interface 20 as shown in (B) of FIG. 1 .
  • a user's input operation for example, click
  • the shooting interface 20 may include an echo control 201, a shooting control 202, a camera conversion control 203, a picture captured by the camera (viewfinder frame) 205, a zoom ratio control 206A, and a setting control 206B , flash switch 206C, one or more shooting mode controls 204 (for example, "Night Scene Mode” control 204A, "Portrait Mode” control 204B, "normal photo mode” control 204C, “short video” control 204D, "video recording mode” control 204E, more mode controls 204F).
  • the echo control 201 can be used to display captured images.
  • the shooting control 202 is used to trigger saving of images captured by the camera.
  • the camera switching control 203 can be used to switch the camera for taking pictures.
  • the setting control 206B can be used to set the camera function.
  • the zoom ratio control 206A can be used to set the zoom ratio of the camera.
  • the zoom factor control 206B can trigger the electronic device 100 to display a zoom slider, and the zoom slider can receive an operation of sliding up (or down) from the user, so that the electronic device 100 can increase (or decrease) the zoom factor of the camera .
  • the zoom magnification control 206B can display a zoom increase control and a zoom decrease control on the electronic device 100, and the zoom increase control can be used to receive and respond to user input, triggering the electronic device 100 to increase the zoom magnification of the camera;
  • the widget can be used to receive and respond to user input, triggering the electronic device 100 to reduce the zoom ratio of the camera.
  • the flash switch 206C can be used to turn on/off the flash.
  • the shooting mode control can be used to trigger an image processing process corresponding to the shooting mode.
  • the "Night Scene Mode" control 204A can be used to trigger increased brightness, color richness, etc. in captured images.
  • the "portrait mode” control 204B can be used to trigger the blurring of the background of the person in the captured image.
  • the shooting mode currently selected by the user is the "normal photographing mode".
  • the focus frame in the viewfinder exists, but the focus frame may or may not be displayed.
  • the embodiment of the present application does not limit whether the focus frame is displayed in the viewfinder.
  • the focus frame is drawn in Figure 1 to indicate that the face focus is not exited, and the focus frame is not drawn to indicate that the face focus is exited.
  • the focus frame can focus on the face of the dancer.
  • the dancer's dance moves are constantly changing, and the focus frame in the viewfinder sometimes detects a human face, and sometimes does not detect a human face.
  • the face focus frame in the viewfinder can detect the face again, and the electronic device can regenerate the face focus frame.
  • the electronic device after the electronic device starts to shoot, it may start to focus on the face.
  • the focus frame of the electronic device may fail to detect the corresponding target (that is, the focus object) within a short period of time, and at this time, the electronic device will exit the focus frame for the above focus object. Thereafter, when the target can be detected again, focus on the target again.
  • the target repeatedly exits and appears in the viewfinder frame, so that the focus frame will change between "disappear” and "appear”, and the target that the user will see is sometimes clear and sometimes not clear. In this way, the user experience is poor.
  • an embodiment of the present application provides a focusing method, which includes: when the electronic device cannot detect the target, it can determine whether the target cannot be detected in multiple consecutive frames. If so, continue to restore the focus frame to the center focus frame (that is, exit this focus frame); otherwise, acquire this focus frame (do not exit this focus frame). In this way, delaying the exit from the focus frame can reduce frequent changes of the focus target in the viewfinder frame, and can reduce the number of clear and unclear image changes of a certain target in the viewfinder frame, thereby improving user experience.
  • a focusing method involved in the embodiment of the present application is introduced below in combination with application scenarios.
  • the electronic device 100 may first determine whether a target can be detected, and delay exiting the focus frame when no target is detected. That is, when the target cannot be detected in multiple consecutive frames, the focus frame can be exited; otherwise, the focus frame can not be exited. Wherein, when the electronic device is shooting, it may judge whether the target can be detected in consecutive multiple frames according to the size and/or position of the focus frame in the viewfinder frame.
  • Fig. 2 shows a schematic diagram of a group of focus preview interfaces. As shown in (A) in FIG. 2 , for the description of (A) in FIG. 2 , reference may be made to the description corresponding to (A) in FIG. 1 , and details are not repeated.
  • the electronic device 100 may receive a user's input operation (for example, click) on the camera icon of the camera application, and in response to the input operation, the electronic device 100 may display the shooting interface 20 as shown in (B) of FIG. 2 .
  • a user's input operation for example, click
  • the current shooting mode that the user can select is "normal shooting mode", and the shooting mode is not limited here.
  • the focus frame can focus on the face of the dancer.
  • the dancer's dance moves are constantly changing, and the focus frame in the viewfinder sometimes detects a human face, and sometimes does not detect a human face.
  • the target is a human face.
  • the description of (C) in FIG. 2 may also refer to the description of (B) in FIG. 1 , without repeating it.
  • the human face focusing frame capture (detection) in the viewfinder frame cannot find a human face.
  • the electronic device can determine whether no face is detected in the viewfinder frame of several consecutive frames (for example, 8 frames), and if so, it can exit the face focus frame; focus frame. That is, the application can detect a few more frames of the preview image, thereby delaying the exit time of face focusing.
  • the electronic device detects a target in at least one frame in a row
  • the focus frame is kept from exiting.
  • Fig. 3 shows a schematic diagram of a group of face focus preview interfaces.
  • the electronic device can keep the human face focusing frame from exiting within several consecutive frames.
  • the face focus frame in the viewfinder can capture the face again, and the face focus frame can continue to focus to the location of the face. In this case, even if the face cannot be detected within a short period of time, the face focus frame may still not exit.
  • the description of (A) and (B) in FIG. 3 may also refer to the description of (B) in FIG. 1 , and no further description is required.
  • the focus frame is kept on for several consecutive frames, and then the focus frame can be exited.
  • the focus frame on the target can be turned on again.
  • Fig. 4 shows a schematic diagram of a group of focus preview interfaces. If there is no viewfinder frame where a face can be detected in several consecutive frames, you can exit face focusing. As shown in (A) of FIG. 4 , when no human face is detected, the electronic device can keep the human face focusing frame from exiting within several consecutive frames. As shown in (B) in Figure 4, within several consecutive seconds, when the dancer is still facing away from the viewfinder and the face cannot be captured in the viewfinder, the face focus frame can exit the face focus frame. As shown in (C) in Fig. 4, when the dancing movement changes at any time and the dancer faces the viewfinder again, the human face can be detected again, and the human face can be refocused. Wherein, the description of (A)-(C) in FIG. 4 may also refer to the description of (B) in FIG. 1 , and no further description is required.
  • the method for detecting whether a human face exists in a viewfinder (that is, a method capable of capturing or detecting a target) according to the embodiment of the present application will be introduced below in conjunction with an application scenario.
  • Implementation method 1 Determine whether a face can be detected according to the size of the face frame.
  • Fig. 5 shows a schematic diagram of a set of focus preview interfaces.
  • the electronic device may display a schematic interface as shown in (A) in FIG. 5 .
  • descriptions of (A) in FIG. 5 and (B) in FIG. 5 may refer to (B) in FIG. 1 , and no further description is required.
  • the electronic device can focus on a human face. When the person gets farther and farther away, the focus frame of the face becomes smaller.
  • a certain value eg, 30*30 pixel value
  • the situation where the face frame becomes smaller is not limited to the fact that the person is getting farther and farther away from the camera, it can also be that the person turns or lowers the head; For the above-mentioned situations, this application does not impose any limitation.
  • Implementation 2 Determine whether a face can be detected according to the position of the face frame.
  • Fig. 6 shows a schematic diagram of a group of focus preview interfaces.
  • the electronic device may display a schematic interface as shown in (A) in FIG. 6 .
  • descriptions of (A) in FIG. 6 and (B) in FIG. 6 may refer to (B) in FIG. 1 , and no further description is required.
  • the electronic device in the viewfinder frame, the electronic device can focus on a human face. When the person is moving, the face moves from the middle position of the viewfinder to the edge position.
  • (B) of FIG. 6 when the position of the focus frame is at the edge of the viewfinder frame, it can be determined that no human face can be detected.
  • the position of the focus frame is at the edge position of the viewfinder frame may be that the center point of the focus frame is at the edge position, the center point of the focus frame is the geometric center of the focus frame, and the edge position of the viewfinder frame may be a certain range inside the boundary of the viewfinder frame (For example, the range of 20 pixels inside the viewing frame), for example, the range of the viewing frame outside the dotted line in (B) in FIG. 6 .
  • the detected object may not be limited to a human face, but may also be an object such as an animal or a vehicle, without limitation.
  • the above-mentioned embodiment 1 and embodiment 2 can be selected as the basis for determining whether the human face can be detected, or both embodiments can be used as the basis for determining.
  • Embodiment 1 and Embodiment 2 are used as the basis for judging, if one of the above-mentioned two embodiments is satisfied, it can be determined that no human face is detected.
  • the determination order of Embodiment 1 and Embodiment 2 is not limited.
  • Fig. 7 shows a schematic diagram of a group of focus preview interfaces.
  • FIG. 7 reference may be made to the description of (B) in FIG. 1 , and details are not repeated.
  • the front face of the person is displayed in the viewfinder frame, and the electronic device can focus on the face.
  • the size of the viewfinder frame becomes smaller, that is, the focus frame is reduced in proportion to the height and width.
  • Implementation method 2 keep the size of the focus frame of the face unchanged.
  • the frontal face of the person is displayed in the viewfinder frame, and the electronic device can focus on the face.
  • the size of the viewfinder frame remains unchanged.
  • the focus frame of the face is adjusted too small, which will cause the focus frame to be too small, and some faces cannot be focused; the focus frame of the face remains unchanged, and the focus frame appears Leakage phenomenon. Therefore, it is impossible to accurately focus on human faces in scenes such as people's side faces, head down and head up.
  • the electronic device may adjust the height and/or width of the focus frame of the face according to the direction in which the face is turned.
  • the electronic device can reduce the height of the focus frame up and down, and keep the left and right width unchanged; when the face turns left and right (sideways or shaking the head), the electronic device can reduce the focus frame Left and right widths, and keep the top and bottom heights constant.
  • the electronic device can only adjust the focusing frame in the direction of head rotation, thereby avoiding the problems of gaps when the focusing frame is too large and incomplete focusing when the focusing frame is too small, so as to improve the accuracy of focusing.
  • Fig. 8 shows a schematic diagram of a group of focus preview interfaces.
  • (A) to (D) in FIG. 8 reference may be made to the description of (B) in FIG. 1 , and details are not repeated.
  • the electronic device when the front face of the person is displayed in the viewfinder frame, the electronic device can focus on the front face of the person, wherein the height (upper and lower) of the focus frame is x, the width is y, and x and y may or may not be equal.
  • x when the human face (head) is turned in the up-down (vertical) direction, x can be turned down.
  • the electronic device can detect the attitude angle of a human face turned up and down, and when the attitude angle of the turned up and down is greater than a certain angle, x can be adjusted to 3/4x.
  • attitude angle is the angle of rotation of the human head
  • attitude angle of up and down rotation is the angle of rotation of the head in the up and down direction (lowering the head or raising the head).
  • the attitude angle in the up and down direction is zero degrees.
  • the above-mentioned adjustment x is not limited to the action of bowing the head, but can also be an action of turning the head in the up and down direction such as raising the head, raising the head, and nodding.
  • the electronic device can adjust y to be small.
  • the electronic device can detect the attitude angle of the left-right (horizontal) rotation of the human face, and when the attitude angle of the left-right rotation is greater than a certain angle, y can be adjusted to 3/4y.
  • attitude angle of the left and right rotation may be the angle of the head's left and right rotation, and when the face is facing the screen, the attitude angle of the horizontal rotation is also zero degrees.
  • the above-mentioned adjustment y is not limited to the movement of turning the head to the left, but may also be the movement of turning the head in the horizontal direction such as turning the head to the right or shaking the head.
  • the following describes an implementation method of exiting the face focusing frame based on the scene.
  • Fig. 9 shows a schematic diagram of a group of focus preview interfaces.
  • the electronic device can focus on the face, and when the electronic device determines to exit the face focus frame, it can move the focus frame to the position of the center focus frame.
  • the center focus frame is a focus frame whose focus frame is located at the geometric center of the viewfinder frame.
  • the face focus frame moves to the position of the center focus frame at one time, thereby completing the exit of the face focus frame.
  • the distance from the current focus frame of the face to the center focus frame is long, a one-time movement will cause obvious jumps in the position of the focus frame, resulting in poor user experience.
  • the embodiment of the present application proposes a focusing method: when it is necessary to exit the face focus frame, the electronic device can determine the distance between the current face focus frame and the center focus frame. When the distance is greater than a certain value, it can be divided into multiple times to move the face focus frame to the center focus frame; when the distance is less than the above certain value, the face focus frame can be moved to the center focus frame at one time.
  • the electronic device may move the face focus frame to the center focus frame multiple times.
  • Fig. 10 shows a schematic diagram of a group of focus preview interfaces.
  • the user interface shown in (A) in Figure 10 can be obtained, and the description of (A), (B), (C) and (D) in Figure 10 can refer to The expression of (B) in Fig. 1 will not be repeated.
  • the electronic device may move from the current face focus frame position to the center focus frame.
  • the focus frame is moved to the center focus frame 3 times in total, and the direction of each movement is close to the center focus frame.
  • the electronic device may move the focus frame of the face to the center focus frame at one time.
  • the face focus frame can be directly moved to the center focus frame.
  • the specific implementation method can refer to the implementation method in FIG. 9 , and will not be repeated.
  • the electronic device when the electronic device exits the focus frame, it can realize the smooth movement of the focus frame, which can reduce the jumping of the focus frame position, thereby improving user experience.
  • the above process of exiting the focus frame of a face is a process of smoothly moving the position of the focus frame, and this embodiment is applicable to the scene of moving the focus frame.
  • FIG. 11 shows a schematic structural diagram of an electronic device 100 .
  • the electronic device 100 may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (universal serial bus, USB) interface 130, a charging management module 140, a power management module 141, a battery 142, an antenna 1, and an antenna 2 , mobile communication module 150, wireless communication module 160, audio module 170, speaker 170A, receiver 170B, microphone 170C, earphone jack 170D, sensor module 180, button 190, motor 191, indicator 192, camera 193, display screen 194, and A subscriber identification module (subscriber identification module, SIM) card interface 195 and the like.
  • SIM subscriber identification module
  • the sensor module 180 may include a pressure sensor 180A, a gyroscope sensor 180B, an air pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity light sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, bone conduction sensor 180M, etc.
  • the structure illustrated in the embodiment of the present invention does not constitute a specific limitation on the electronic device 100 .
  • the electronic device 100 may include more or fewer components than shown in the figure, or combine certain components, or separate certain components, or arrange different components.
  • the illustrated components can be realized in hardware, software or a combination of software and hardware.
  • the processor 110 may include one or more processing units, for example: the processor 110 may include an application processor (application processor, AP), a modem processor, a graphics processing unit (graphics processing unit, GPU), an image signal processor (image signal processor, ISP), controller, memory, video codec, digital signal processor (digital signal processor, DSP), baseband processor, and/or neural network processor (neural-network processing unit, NPU) Wait. Wherein, different processing units may be independent devices, or may be integrated in one or more processors.
  • application processor application processor, AP
  • modem processor graphics processing unit
  • GPU graphics processing unit
  • image signal processor image signal processor
  • ISP image signal processor
  • controller memory
  • video codec digital signal processor
  • DSP digital signal processor
  • baseband processor baseband processor
  • neural network processor neural-network processing unit
  • the controller may be the nerve center and command center of the electronic device 100 .
  • the controller can generate an operation control signal according to the instruction opcode and timing signal, and complete the control of fetching and executing the instruction.
  • a memory may also be provided in the processor 110 for storing instructions and data.
  • the memory in processor 110 is a cache memory.
  • the memory may hold instructions or data that the processor 110 has just used or recycled. If the processor 110 needs to use the instruction or data again, it can be called directly from the memory. Repeated access is avoided, and the waiting time of the processor 110 is reduced, thus improving the efficiency of the system.
  • processor 110 may include one or more interfaces.
  • the interface may include an integrated circuit (inter-integrated circuit, I2C) interface, an integrated circuit built-in audio (inter-integrated circuit sound, I2S) interface, a pulse code modulation (pulse code modulation, PCM) interface, a universal asynchronous transmitter (universal asynchronous receiver/transmitter, UART) interface, mobile industry processor interface (mobile industry processor interface, MIPI), general-purpose input and output (general-purpose input/output, GPIO) interface, subscriber identity module (subscriber identity module, SIM) interface, and /or universal serial bus (universal serial bus, USB) interface, etc.
  • I2C integrated circuit
  • I2S integrated circuit built-in audio
  • PCM pulse code modulation
  • PCM pulse code modulation
  • UART universal asynchronous transmitter
  • MIPI mobile industry processor interface
  • GPIO general-purpose input and output
  • subscriber identity module subscriber identity module
  • SIM subscriber identity module
  • USB universal serial bus
  • the I2C interface is a bidirectional synchronous serial bus, including a serial data line (serial data line, SDA) and a serial clock line (derail clock line, SCL).
  • processor 110 may include multiple sets of I2C buses.
  • the processor 110 can be respectively coupled to the touch sensor 180K, the charger, the flashlight, the camera 193 and the like through different I2C bus interfaces.
  • the processor 110 may be coupled to the touch sensor 180K through the I2C interface, so that the processor 110 and the touch sensor 180K communicate through the I2C bus interface to realize the touch function of the electronic device 100 .
  • the I2S interface can be used for audio communication.
  • processor 110 may include multiple sets of I2S buses.
  • the processor 110 may be coupled to the audio module 170 through an I2S bus to implement communication between the processor 110 and the audio module 170 .
  • the audio module 170 can transmit audio signals to the wireless communication module 160 through the I2S interface, so as to realize the function of answering calls through the Bluetooth headset.
  • the PCM interface can also be used for audio communication, sampling, quantizing and encoding the analog signal.
  • the audio module 170 and the wireless communication module 160 may be coupled through a PCM bus interface.
  • the audio module 170 can also transmit audio signals to the wireless communication module 160 through the PCM interface, so as to realize the function of answering calls through the Bluetooth headset. Both the I2S interface and the PCM interface can be used for audio communication.
  • the UART interface is a universal serial data bus used for asynchronous communication.
  • the bus can be a bidirectional communication bus. It converts the data to be transmitted between serial communication and parallel communication.
  • a UART interface is generally used to connect the processor 110 and the wireless communication module 160 .
  • the processor 110 communicates with the Bluetooth module in the wireless communication module 160 through the UART interface to realize the Bluetooth function.
  • the audio module 170 can transmit audio signals to the wireless communication module 160 through the UART interface, so as to realize the function of playing music through the Bluetooth headset.
  • the MIPI interface can be used to connect the processor 110 with peripheral devices such as the display screen 194 and the camera 193 .
  • MIPI interface includes camera serial interface (camera serial interface, CSI), display serial interface (display serial interface, DSI), etc.
  • the processor 110 communicates with the camera 193 through the CSI interface to realize the shooting function of the electronic device 100 .
  • the processor 110 communicates with the display screen 194 through the DSI interface to realize the display function of the electronic device 100 .
  • the GPIO interface can be configured by software.
  • the GPIO interface can be configured as a control signal or as a data signal.
  • the GPIO interface can be used to connect the processor 110 with the camera 193 , the display screen 194 , the wireless communication module 160 , the audio module 170 , the sensor module 180 and so on.
  • the GPIO interface can also be configured as an I2C interface, I2S interface, UART interface, MIPI interface, etc.
  • the USB interface 130 is an interface conforming to the USB standard specification, specifically, it can be a Mini USB interface, a Micro USB interface, a USB Type C interface, etc.
  • the USB interface 130 can be used to connect a charger to charge the electronic device 100 , and can also be used to transmit data between the electronic device 100 and peripheral devices. It can also be used to connect headphones and play audio through them. This interface can also be used to connect other electronic devices, such as AR devices.
  • the interface connection relationship between the modules shown in the embodiment of the present invention is only a schematic illustration, and does not constitute a structural limitation of the electronic device 100 .
  • the electronic device 100 may also adopt different interface connection manners in the foregoing embodiments, or a combination of multiple interface connection manners.
  • the charging management module 140 is configured to receive a charging input from a charger.
  • the charger may be a wireless charger or a wired charger.
  • the charging management module 140 can receive charging input from the wired charger through the USB interface 130 .
  • the charging management module 140 may receive a wireless charging input through a wireless charging coil of the electronic device 100 . While the charging management module 140 is charging the battery 142 , it can also provide power for electronic devices through the power management module 141 .
  • the power management module 141 is used for connecting the battery 142 , the charging management module 140 and the processor 110 .
  • the power management module 141 receives the input from the battery 142 and/or the charging management module 140 to provide power for the processor 110 , the internal memory 121 , the external memory, the display screen 194 , the camera 193 , and the wireless communication module 160 .
  • the power management module 141 can also be used to monitor parameters such as battery capacity, battery cycle times, and battery health status (leakage, impedance).
  • the power management module 141 may also be disposed in the processor 110 .
  • the power management module 141 and the charging management module 140 may also be set in the same device.
  • the wireless communication function of the electronic device 100 can be realized by the antenna 1 , the antenna 2 , the mobile communication module 150 , the wireless communication module 160 , a modem processor, a baseband processor, and the like.
  • Antenna 1 and Antenna 2 are used to transmit and receive electromagnetic wave signals.
  • Each antenna in electronic device 100 may be used to cover single or multiple communication frequency bands. Different antennas can also be multiplexed to improve the utilization of the antennas.
  • Antenna 1 can be multiplexed as a diversity antenna of a wireless local area network.
  • the antenna may be used in conjunction with a tuning switch.
  • the mobile communication module 150 can provide wireless communication solutions including 2G/3G/4G/5G applied on the electronic device 100 .
  • the mobile communication module 150 may include at least one filter, switch, power amplifier, low noise amplifier (low noise amplifier, LNA) and the like.
  • the mobile communication module 150 can receive electromagnetic waves through the antenna 1, filter and amplify the received electromagnetic waves, and send them to the modem processor for demodulation.
  • the mobile communication module 150 can also amplify the signals modulated by the modem processor, and convert them into electromagnetic waves through the antenna 1 for radiation.
  • at least part of the functional modules of the mobile communication module 150 may be set in the processor 110 .
  • at least part of the functional modules of the mobile communication module 150 and at least part of the modules of the processor 110 may be set in the same device.
  • a modem processor may include a modulator and a demodulator.
  • the modulator is used for modulating the low-frequency baseband signal to be transmitted into a medium-high frequency signal.
  • the demodulator is used to demodulate the received electromagnetic wave signal into a low frequency baseband signal. Then the demodulator sends the demodulated low-frequency baseband signal to the baseband processor for processing.
  • the low-frequency baseband signal is passed to the application processor after being processed by the baseband processor.
  • the application processor outputs sound signals through audio equipment (not limited to speaker 170A, receiver 170B, etc.), or displays pictures or videos through display screen 194 .
  • the modem processor may be a stand-alone device.
  • the modem processor may be independent from the processor 110, and be set in the same device as the mobile communication module 150 or other functional modules.
  • the wireless communication module 160 can provide wireless local area networks (wireless local area networks, WLAN) (such as wireless fidelity (Wireless Fidelity, Wi-Fi) network), bluetooth (bluetooth, BT), global navigation satellite, etc. System (global navigation satellite system, GNSS), frequency modulation (frequency modulation, FM), near field communication technology (near field communication, NFC), infrared technology (infrared, IR) and other wireless communication solutions.
  • the wireless communication module 160 may be one or more devices integrating at least one communication processing module.
  • the wireless communication module 160 receives electromagnetic waves via the antenna 2 , frequency-modulates and filters the electromagnetic wave signals, and sends the processed signals to the processor 110 .
  • the wireless communication module 160 can also receive the signal to be sent from the processor 110 , frequency-modulate it, amplify it, and convert it into electromagnetic waves through the antenna 2 for radiation.
  • the antenna 1 of the electronic device 100 is coupled to the mobile communication module 150, and the antenna 2 is coupled to the wireless communication module 160, so that the electronic device 100 can communicate with the network and other devices through wireless communication technology.
  • the wireless communication technology may include global system for mobile communications (GSM), general packet radio service (general packet radio service, GPRS), code division multiple access (code division multiple access, CDMA), broadband Code division multiple access (wideband code division multiple access, WCDMA), time division code division multiple access (time-division code division multiple access, TD-SCDMA), long term evolution (long term evolution, LTE), BT, GNSS, WLAN, NFC , FM, and/or IR techniques, etc.
  • GSM global system for mobile communications
  • GPRS general packet radio service
  • code division multiple access code division multiple access
  • CDMA broadband Code division multiple access
  • WCDMA wideband code division multiple access
  • time division code division multiple access time-division code division multiple access
  • TD-SCDMA time-division code division multiple access
  • the GNSS may include a global positioning system (global positioning system, GPS), a global navigation satellite system (global navigation satellite system, GLONASS), a Beidou navigation satellite system (beidou navigation satellite system, BDS), a quasi-zenith satellite system (quasi -zenith satellite system (QZSS) and/or satellite based augmentation systems (SBAS).
  • GPS global positioning system
  • GLONASS global navigation satellite system
  • Beidou navigation satellite system beidou navigation satellite system
  • BDS Beidou navigation satellite system
  • QZSS quasi-zenith satellite system
  • SBAS satellite based augmentation systems
  • the electronic device 100 realizes the display function through the GPU, the display screen 194 , and the application processor.
  • the GPU is a microprocessor for image processing, and is connected to the display screen 194 and the application processor. GPUs are used to perform mathematical and geometric calculations for graphics rendering.
  • Processor 110 may include one or more GPUs that execute program instructions to generate or change display information.
  • the display screen 194 is used for displaying pictures, videos and the like.
  • the display screen 194 includes a display panel.
  • the display panel can be a liquid crystal display (LCD), an organic light-emitting diode (OLED), an active matrix organic light emitting diode or an active matrix organic light emitting diode (active-matrix organic light emitting diode, AMOLED), flexible light-emitting diode (flex light-emitting diode, FLED), Miniled, MicroLed, Micro-oLed, quantum dot light emitting diodes (quantum dot light emitting diodes, QLED), etc.
  • the electronic device 100 may include 1 or N display screens 194 , where N is a positive integer greater than 1.
  • the electronic device 100 can realize the acquisition function through the ISP, the camera 193, the video codec, the GPU, the display screen 194 and the application processor, so as to realize the image acquisition module of the HAL layer in the embodiment of the present application.
  • the ISP is used for processing the data fed back by the camera 193 .
  • the light is transmitted to the photosensitive element of the camera through the lens, the light signal is converted into an electrical signal, and the photosensitive element of the camera transmits the electrical signal to the ISP for processing, and converts it into a picture or video visible to the naked eye.
  • ISP can also perform algorithm optimization on image noise, brightness, and skin tone. ISP can also optimize the exposure, color temperature and other parameters of the shooting scene.
  • the ISP may be located in the camera 193 .
  • the camera 193 is used to capture still pictures or videos.
  • the object generates an optical image through the lens and projects it to the photosensitive element.
  • the photosensitive element may be a charge coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) phototransistor.
  • CMOS complementary metal-oxide-semiconductor
  • the photosensitive element converts the light signal into an electrical signal, and then transmits the electrical signal to the ISP to convert it into a digital picture or video signal.
  • the ISP outputs the digital picture or video signal to the DSP for processing.
  • DSP converts digital pictures or video signals into pictures or video signals in standard RGB, YUV and other formats.
  • the electronic device 100 may include 1 or N cameras 193 , where N is a positive integer greater than 1.
  • a camera can include a lens, a focus motor, and an image sensor (that is, a photosensitive element of the camera), and the focus motor can push the lens to adjust the focus.
  • Digital signal processors are used to process digital signals. In addition to processing digital pictures or video signals, they can also process other digital signals. For example, when the electronic device 100 selects a frequency point, the digital signal processor is used to perform Fourier transform on the energy of the frequency point.
  • Video codecs are used to compress or decompress digital video.
  • the electronic device 100 may support one or more video codecs.
  • the electronic device 100 can play or record videos in various encoding formats, for example: moving picture experts group (moving picture experts group, MPEG) 1, MPEG2, MPEG3, MPEG4 and so on.
  • MPEG moving picture experts group
  • the NPU is a neural-network (NN) computing processor.
  • NN neural-network
  • Applications such as intelligent cognition of the electronic device 100 can be realized through the NPU, such as image recognition, face recognition, speech recognition, text understanding, and the like.
  • the external memory interface 120 can be used to connect an external memory card, such as a Micro SD card, so as to expand the storage capacity of the electronic device 100.
  • the external memory card communicates with the processor 110 through the external memory interface 120 to implement a data storage function. Such as saving music, video and other files in the external memory card.
  • the internal memory 121 may be used to store computer-executable program codes including instructions.
  • the processor 110 executes various functional applications and data processing of the electronic device 100 by executing instructions stored in the internal memory 121 .
  • the internal memory 121 may include an area for storing programs and an area for storing data.
  • the storage program area can store an operating system, at least one application program required by a function (such as a sound playing function, a picture or video playing function, etc.) and the like.
  • the storage data area can store data created during the use of the electronic device 100 (such as audio data, phonebook, etc.) and the like.
  • the internal memory 121 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, flash memory device, universal flash storage (universal flash storage, UFS) and the like.
  • the electronic device 100 can implement audio functions through the audio module 170 , the speaker 170A, the receiver 170B, the microphone 170C, the earphone interface 170D, and the application processor. Such as music playback, recording, etc.
  • the audio module 170 is used to convert digital audio information into analog audio signal output, and is also used to convert analog audio input into digital audio signal.
  • the audio module 170 may also be used to encode and decode audio signals.
  • the audio module 170 may be set in the processor 110 , or some functional modules of the audio module 170 may be set in the processor 110 .
  • Speaker 170A also referred to as a "horn" is used to convert audio electrical signals into sound signals.
  • Electronic device 100 can listen to music through speaker 170A, or listen to hands-free calls.
  • Receiver 170B also called “earpiece” is used to convert audio electrical signals into sound signals.
  • the receiver 170B can be placed close to the human ear to receive the voice.
  • the microphone 170C also called “microphone” or “microphone” is used to convert sound signals into electrical signals.
  • the user can put his mouth close to the microphone 170C to make a sound, and input the sound signal to the microphone 170C.
  • the electronic device 100 may be provided with at least one microphone 170C.
  • the electronic device 100 can be provided with two microphones 170C, which can also implement a noise reduction function in addition to collecting sound signals.
  • the electronic device 100 can also be provided with three, four or more microphones 170C to collect sound signals, reduce noise, identify sound sources, and realize directional recording functions, etc.
  • the earphone interface 170D is used for connecting wired earphones.
  • the earphone interface 170D can be a USB interface 130, or a 3.5mm open mobile terminal platform (OMTP) standard interface, or a cellular telecommunications industry association of the USA (CTIA) standard interface.
  • OMTP open mobile terminal platform
  • CTIA cellular telecommunications industry association of the USA
  • the pressure sensor 180A is used to sense the pressure signal and convert the pressure signal into an electrical signal.
  • pressure sensor 180A may be disposed on display screen 194 .
  • pressure sensors 180A such as resistive pressure sensors, inductive pressure sensors, and capacitive pressure sensors.
  • a capacitive pressure sensor may be comprised of at least two parallel plates with conductive material.
  • the electronic device 100 determines the intensity of pressure according to the change in capacitance.
  • the electronic device 100 detects the intensity of the touch operation according to the pressure sensor 180A.
  • the electronic device 100 may also calculate the touched position according to the detection signal of the pressure sensor 180A.
  • touch operations acting on the same touch position but with different touch operation intensities may correspond to different operation instructions. For example: when a touch operation with a touch operation intensity less than the first pressure threshold acts on the short message application icon, an instruction to view short messages is executed. When a touch operation whose intensity is greater than or equal to the first pressure threshold acts on the icon of the short message application, the instruction of creating a new short message is executed.
  • the gyro sensor 180B can be used to determine the motion posture of the electronic device 100 .
  • the angular velocity of the electronic device 100 around three axes may be determined by the gyro sensor 180B.
  • the gyro sensor 180B can be used for image stabilization. Exemplarily, when the shutter is pressed, the gyro sensor 180B detects the shaking angle of the electronic device 100, calculates the distance that the lens module needs to compensate according to the angle, and allows the lens to counteract the shaking of the electronic device 100 through reverse movement to achieve anti-shake.
  • the gyro sensor 180B can also be used for navigation and somatosensory game scenes.
  • the air pressure sensor 180C is used to measure air pressure.
  • the electronic device 100 calculates the altitude based on the air pressure value measured by the air pressure sensor 180C to assist positioning and navigation.
  • the magnetic sensor 180D includes a Hall sensor.
  • the electronic device 100 may use the magnetic sensor 180D to detect the opening and closing of the flip leather case.
  • the electronic device 100 when the electronic device 100 is a clamshell machine, the electronic device 100 can detect opening and closing of the clamshell according to the magnetic sensor 180D.
  • features such as automatic unlocking of the flip cover are set.
  • the acceleration sensor 180E can detect the acceleration of the electronic device 100 in various directions (generally three axes). When the electronic device 100 is stationary, the magnitude and direction of gravity can be detected. It can also be used to identify the posture of electronic devices, and can be used in applications such as horizontal and vertical screen switching, pedometers, etc.
  • the distance sensor 180F is used to measure the distance.
  • the electronic device 100 may measure the distance by infrared or laser. In some embodiments, when shooting a scene, the electronic device 100 may use the distance sensor 180F for distance measurement to achieve fast focusing.
  • Proximity light sensor 180G may include, for example, light emitting diodes (LEDs) and light detectors, such as photodiodes.
  • the light emitting diodes may be infrared light emitting diodes.
  • the electronic device 100 emits infrared light through the light emitting diode.
  • Electronic device 100 uses photodiodes to detect infrared reflected light from nearby objects. When sufficient reflected light is detected, it may be determined that there is an object near the electronic device 100 . When insufficient reflected light is detected, the electronic device 100 may determine that there is no object near the electronic device 100 .
  • the electronic device 100 can use the proximity light sensor 180G to detect that the user holds the electronic device 100 close to the ear to make a call, so as to automatically turn off the screen to save power.
  • the proximity light sensor 180G can also be used in leather case mode, automatic unlock and lock screen in pocket mode.
  • the ambient light sensor 180L is used for sensing ambient light brightness.
  • the electronic device 100 can adaptively adjust the brightness of the display screen 194 according to the perceived ambient light brightness.
  • the ambient light sensor 180L can also be used to automatically adjust the white balance when taking pictures.
  • the ambient light sensor 180L can also cooperate with the proximity light sensor 180G to detect whether the electronic device 100 is in the pocket, so as to prevent accidental touch.
  • the fingerprint sensor 180H is used to collect fingerprints.
  • the electronic device 100 can use the collected fingerprint characteristics to implement fingerprint unlocking, access to application locks, take pictures with fingerprints, answer incoming calls with fingerprints, and the like.
  • the temperature sensor 180J is used to detect temperature.
  • the electronic device 100 uses the temperature detected by the temperature sensor 180J to implement a temperature treatment strategy. For example, when the temperature reported by the temperature sensor 180J exceeds the threshold, the electronic device 100 may reduce the performance of the processor located near the temperature sensor 180J, so as to reduce power consumption and implement thermal protection.
  • the electronic device 100 when the temperature is lower than another threshold, the electronic device 100 heats the battery 142 to prevent the electronic device 100 from being shut down abnormally due to the low temperature.
  • the electronic device 100 boosts the output voltage of the battery 142 to avoid abnormal shutdown caused by low temperature.
  • Touch sensor 180K also known as "touch panel”.
  • the touch sensor 180K can be disposed on the display screen 194, and the touch sensor 180K and the display screen 194 form a touch screen, also called a “touch screen”.
  • the touch sensor 180K is used to detect a touch operation on or near it.
  • the touch sensor can pass the detected touch operation to the application processor to determine the type of touch event.
  • Visual output related to the touch operation can be provided through the display screen 194 .
  • the touch sensor 180K may also be disposed on the surface of the electronic device 100 , which is different from the position of the display screen 194 .
  • the bone conduction sensor 180M can acquire vibration signals. In some embodiments, the bone conduction sensor 180M can acquire the vibration signal of the vibrating bone mass of the human voice. The bone conduction sensor 180M can also contact the human pulse and receive the blood pressure beating signal. In some embodiments, the bone conduction sensor 180M can also be disposed in the earphone, combined into a bone conduction earphone.
  • the audio module 170 can analyze the voice signal based on the vibration signal of the vibrating bone mass of the vocal part acquired by the bone conduction sensor 180M, so as to realize the voice function.
  • the application processor can analyze the heart rate information based on the blood pressure beating signal acquired by the bone conduction sensor 180M, so as to realize the heart rate detection function.
  • the keys 190 include a power key, a volume key and the like.
  • the key 190 may be a mechanical key. It can also be a touch button.
  • the electronic device 100 can receive key input and generate key signal input related to user settings and function control of the electronic device 100 .
  • the motor 191 can generate a vibrating reminder.
  • the motor 191 can be used for incoming call vibration prompts, and can also be used for touch vibration feedback.
  • touch operations applied to different applications may correspond to different vibration feedback effects.
  • the motor 191 may also correspond to different vibration feedback effects for touch operations acting on different areas of the display screen 194 .
  • Different application scenarios for example: time reminder, receiving information, alarm clock, games, etc.
  • the touch vibration feedback effect can also support customization.
  • the indicator 192 can be an indicator light, and can be used to indicate charging status, power change, and can also be used to indicate messages, missed calls, notifications, and the like.
  • the SIM card interface 195 is used for connecting a SIM card.
  • the SIM card can be connected and separated from the electronic device 100 by inserting it into the SIM card interface 195 or pulling it out from the SIM card interface 195 .
  • the electronic device 100 may support 1 or N SIM card interfaces, where N is a positive integer greater than 1.
  • SIM card interface 195 can support Nano SIM card, Micro SIM card, SIM card etc. Multiple cards can be inserted into the same SIM card interface 195 at the same time. The types of the multiple cards can be the same or different.
  • the SIM card interface 195 is also compatible with different types of SIM cards.
  • the SIM card interface 195 is also compatible with external memory cards.
  • the electronic device 100 interacts with the network through the SIM card to implement functions such as calling and data communication.
  • the electronic device 100 adopts an eSIM, that is, an embedded SIM card.
  • the eSIM card can be embedded in the electronic device 100 and cannot be separated from the electronic device 100 .
  • the software system of the electronic device 100 may adopt a layered architecture, an event-driven architecture, a micro-kernel architecture, a micro-service architecture, or a cloud architecture.
  • the software structure of the electronic device 100 is exemplarily described by taking an Android system with a layered architecture as an example.
  • FIG. 12 is a block diagram of the software structure of the electronic device 100 according to the embodiment of the present application.
  • the layered architecture divides the software into several layers, and each layer has a clear role and division of labor. Layers communicate through software interfaces.
  • the Android system is divided into four layers, which are respectively the application program layer, the application program framework layer, the Android runtime (Android runtime) and the system library, and the kernel layer from top to bottom.
  • the application layer can consist of a series of application packages.
  • the application package may include application programs such as camera, gallery, calendar, call, map, navigation, WLAN, Bluetooth, music, video, and short message.
  • application programs such as camera, gallery, calendar, call, map, navigation, WLAN, Bluetooth, music, video, and short message.
  • the application framework layer provides an application programming interface (application programming interface, API) and a programming framework for applications in the application layer.
  • the application framework layer includes some predefined functions.
  • the application framework layer can include window manager, content provider, view system, phone manager, resource manager, notification manager, etc.
  • a window manager is used to manage window programs.
  • the window manager can get the size of the display screen, determine whether there is a status bar, lock the screen, capture the screen, etc.
  • Content providers are used to store and retrieve data and make it accessible to applications.
  • Said data may include video, images, audio, calls made and received, browsing history and bookmarks, phonebook, etc.
  • the view system includes visual controls, such as controls for displaying text, controls for displaying pictures, and so on.
  • the view system can be used to build applications.
  • a display interface can consist of one or more views.
  • a display interface including a text message notification icon may include a view for displaying text and a view for displaying pictures.
  • the phone manager is used to provide communication functions of the electronic device 100 . For example, the management of call status (including connected, hung up, etc.).
  • the resource manager provides various resources for the application, such as localized strings, icons, pictures, layout files, video files, and so on.
  • the notification manager enables the application to display notification information in the status bar, which can be used to convey notification-type messages, and can automatically disappear after a short stay without user interaction.
  • the notification manager is used to notify the download completion, message reminder, etc.
  • the notification manager can also be a notification that appears on the top status bar of the system in the form of a chart or scroll bar text, such as a notification of an application running in the background, or a notification that appears on the screen in the form of a dialog window.
  • prompting text information in the status bar issuing a prompt sound, vibrating the electronic device, and flashing the indicator light, etc.
  • the Android Runtime includes core library and virtual machine. The Android runtime is responsible for the scheduling and management of the Android system.
  • the core library consists of two parts: one part is the function function that the java language needs to call, and the other part is the core library of Android.
  • the application layer and the application framework layer run in virtual machines.
  • the virtual machine executes the java files of the application program layer and the application program framework layer as binary files.
  • the virtual machine is used to perform functions such as object life cycle management, stack management, thread management, security and exception management, and garbage collection.
  • a system library can include multiple function modules. For example: surface manager (surface manager), media library (Media Libraries), 3D graphics processing library (eg: OpenGL ES), 2D graphics engine (eg: SGL), etc.
  • the surface manager is used to manage the display subsystem and provides the fusion of 2D and 3D layers for multiple applications.
  • the media library supports playback and recording of various commonly used audio and video formats, as well as still image files, etc.
  • the media library can support a variety of audio and video encoding formats, such as: MPEG4, H.264, MP3, AAC, AMR, JPG, PNG, etc.
  • the 3D graphics processing library is used to implement 3D graphics drawing, image rendering, compositing, and layer processing, etc.
  • 2D graphics engine is a drawing engine for 2D drawing.
  • the kernel layer is the layer between hardware and software.
  • the kernel layer includes at least a display driver, a camera driver, an audio driver, and a sensor driver.
  • the workflow of the software and hardware of the electronic device 100 will be exemplarily described below in combination with the scene of focusing and taking photos.
  • the camera driver When the camera driver determines that the focus frame needs to be adjusted, it can drive the corresponding hardware to adjust the focus. When the size of the focus frame needs to be adjusted and/or, the camera driver can drive the focus motor, and the focus motor can push the lens to a corresponding position.
  • FIG. 13 is a schematic flowchart of a focusing method provided by an embodiment of the present application. As shown in FIG. 13 , the focusing method includes steps S101 - S105 .
  • judging whether to exit the first focus frame by judging the size and position of the focus frame in several consecutive frames can improve the conditions for exiting the focus frame, thereby delaying exit from the focus frame.
  • step S101 The electronic device judges whether the target cannot be detected in consecutive A frames. If yes, execute step S103; otherwise, execute step S102.
  • the target is a focus object in the preview image, for example, the target is a human face.
  • the preview screen may be a preview screen when the electronic device is shooting.
  • A is a positive integer, and the range of A may be 3 to 20, preferably, A is 8.
  • the electronic device can judge whether the target can be detected according to the size and/or position of the target frame:
  • Embodiment 1 The electronic device may determine whether the size of the target frame is smaller than the first threshold. If yes, the target cannot be detected.
  • the target frame may be a human face frame, an object frame, or an animal frame, etc.
  • the size of the target frame is the pixel value size of the focused part.
  • the size of the first threshold is (M*N), the range of M is 10 to 50, and the range of N is 10 to 50.
  • the first threshold is 30*30. For example, when the size of the target frame is 20*20 and the first threshold is 30*30, it is judged that if 20 is smaller than 30, it can be determined that the target frame does not exist in the preview screen.
  • Embodiment 2 The electronic device can determine whether the center point of the target frame falls within the edge range of the preview image, and if so, the target cannot be detected.
  • FIG. 14 is a schematic diagram of a focus preview interface shown in an embodiment of the present application.
  • the center point of the target frame is the geometric center point of the target frame.
  • the edge range (gray part) of the preview picture may be the edge part in the preview picture.
  • the edge range of the preview image may be a part of 20 pixels within the viewfinder frame, or an edge range of other pixel values away from the viewfinder frame, which is not limited.
  • the foregoing determination of whether the size and/or position of the target frame satisfies a preset condition may include one or both of the foregoing implementation manners.
  • the two implementation manners it can be determined that the target is detected if and only when the above two conditions are not satisfied, otherwise the target cannot be detected.
  • the execution order of the two implementations is not limited, the size of the target frame can be determined first and then the position of the target frame can be determined, or the position of the target frame can be determined first and then the size of the target frame can be determined.
  • the electronic device acquires a first focusing frame.
  • the electronic device can acquire the first focus frame, that is, the electronic device can focus on the target.
  • the electronic device may focus on the target, and the formed first focus frame may or may not be displayed, which is not limited here.
  • step S103 The electronic device judges whether the target is detected in all consecutive B frames before the A frame. If yes, execute step S104; otherwise, execute step S105.
  • B is a positive integer, and the value of B can range from 1 to 8.
  • B is 3.
  • the electronic device can judge the 3 frames before the 8 frames, and if the target is detected in the 3 frames, perform step S104; otherwise, If no target is detected in at least one of the three frames, go to step S102.
  • step S104 The electronic device judges whether the target is not detected in the consecutive C frames after the A frame, and if yes, executes step S105; otherwise, executes step S102.
  • C is a positive integer, and the value range of C can be 1 to 8. Preferably, C is 3 or 5.
  • FIG. 15 shows a schematic diagram of a focus situation of a group of continuous multi-frame preview images.
  • A is 8, B and C are both 3, 1 indicates that the target is detected in the preview image of one frame, and 0 indicates that the target is not detected in the preview image of one frame.
  • the electronic device can determine whether the consecutive A frames are all 0, and if so, further determine the B frame; otherwise, execute step S102. Among them, the 8 consecutive frames (a), (b), (c) and (d) in Figure 15 are all 0, and the last two frames in (e) A frame are 1, so (e) obtain the first focus frame . Second, the electronic device determines whether consecutive B frames are all 1s. If yes, further judge the C frame; otherwise, execute step S105.
  • the consecutive 3 frames (B frame) (a) and (b) in Fig. 15 are both 1, (c) and (d) are not both 1, therefore, (a) and (b) continue to judge the C frame, (c) and (d) Restoring the center focus frame.
  • the electronic device determines whether (a) and (b) consecutive C frames are both 0, and if so, execute step S105; otherwise, execute step S102. Among them, (a) all 3 frames are 0, (a) restore the center focus frame; (b) not all 3 frames are 0, (b) obtain the first focus frame.
  • the electronic device restores the center focusing frame.
  • the electronic device may move the first focus frame to the center focus frame.
  • the electronic device may move the first focus frame to the center focus frame.
  • FIG. 16 is a schematic flowchart of another focusing method provided by an embodiment of the present application. As shown in FIG. 16 , the focusing method includes steps S201 - S203 .
  • step S201 The electronic device judges whether the target cannot be detected in consecutive A frames. If yes, execute step S202; otherwise, execute step S203.
  • step S201 For the description of step S201, reference may be made to the related description of step S101, and details are not repeated.
  • the electronic device acquires a first focusing frame.
  • step S202 for the description of step S202, reference may be made to the related description of step S102, and details are not repeated.
  • the electronic device restores the focus frame of the center.
  • step S203 for the description of step S203, reference may be made to the related description of step S105, and details are not repeated.
  • FIG. 17 is a schematic flowchart of another focusing method provided by an embodiment of the present application. As shown in FIG. 17 , the focusing method includes steps S301 - S303 .
  • the size of the focus frame is adjusted according to the rotation of the face pose angle in the focus frame.
  • the electronic device adjusts the vertical height of the first focus frame according to the face posture angle of the vertical rotation of the posture angle; and/or adjusts the left and right width of the first focus frame according to the face posture angle of the left and right rotation of the posture angle.
  • the electronic device collects a facial posture angle yaw and/or pitch.
  • the face pose angle may include yaw and/or pitch, the angle of rotation of the head of the person.
  • Fig. 18 shows a schematic diagram of attitude angles when a human face turns.
  • the vertical downward direction is the Y axis
  • the horizontal direction is the X axis direction.
  • the face posture angle yaw is the angle of the human head turning up and down, that is, the angle of the human head turning along the Y axis (ie the person shakes or turns the head) is the degree of yaw.
  • the face pose angle pitch is the angle at which the human head rotates along the left and right, and the angle at which the human head rotates along the X axis (that is, the person nods, lowers the head, raises the head, or raises the head, etc.) is the degree of the pitch.
  • the electronic device can determine yaw and pitch through a face pose estimation method.
  • the electronic device can estimate 3D (three dimensional) pose information (face pose angle in 3-dimensional space) through 2D (two dimensional) calibration information (that is, the 2D image data of the preview screen), for example, it can first The image data of the screen calculates the key points of the face (such as eyes, nose, face outline, etc.), and then selects the reference system (that is, the key points when the preview screen is the frontal face of the person), and calculates the transformation of the key points and the reference system Matrix, through iteration to estimate the pose angle yaw and pitch of the face. It should be understood that determining yaw and pitch may also be in other manners without limitation.
  • the first angle can be a preset angle, the range of the first angle is 25 degrees to 45 degrees, preferably, the first angle is 30 degrees, and the height of the first focusing frame is the length of the first focusing frame in the vertical direction , the width of the first focus frame is the length of the first focus frame in the horizontal direction.
  • the electronic device When the electronic device detects that the person's head is lowered or raised to a certain angle, the vertical length of the face in the preview image will be reduced, so the length of the focus frame of the face in the vertical direction can be reduced.
  • the electronic equipment can be reduced according to a certain ratio, and can also be reduced according to a certain length. For details, refer to the description of (A) in FIG. 8 and (B) in FIG. 8 .
  • the second angle may also be a preset angle, and the range of the second angle is 25 degrees to 45 degrees, preferably, the second angle is 30 degrees.
  • the electronic device When the electronic device measures that the side head reaches a certain angle, the horizontal length of the face in the preview image will be reduced, so the length of the focusing frame of the human face in the horizontal direction can be reduced.
  • the electronic equipment can be reduced according to a certain ratio, and can also be reduced according to a certain length. For details, reference may be made to the description of (C) in FIG. 8 and (D) in FIG. 8 .
  • step S302 and step S303 may include both.
  • the execution order of step S302 and step S303 is not limited, step S302 may be executed first and then step S303 may be executed, or step S303 may be executed first and then step S302 may be executed.
  • the focus frame of the electronic device when the focus frame of the electronic device is aligned with the face, the focus frame can be adjusted correspondingly according to the rotation of the face, so that the focus frame can accurately focus on the position of the face, thereby improving user experience.
  • FIG. 19 is a schematic flowchart of another focusing method provided by an embodiment of the present application. As shown in FIG. 19 , the focusing method includes steps S401-S403.
  • different ways of moving the focus frame may be selected according to the current position of the focus frame and the position of the target focus frame.
  • the electronic device may move the focus frame multiple times; otherwise, the electronic device may move the focus frame once.
  • the electronic device can first determine the target position a and the current position b, and then determine whether the absolute value of the difference between the target position and the current position is greater than the second threshold c, that is, determine
  • the current position may be the motor position corresponding to the current focus frame
  • the target position may be the motor position corresponding to the target focus frame to which the focus frame needs to be moved.
  • the second threshold may be 15 microns or 30 microns, without limitation. Due to different cameras and different shooting scenarios, when the motor is pushed to the quasi-focus position at one time, there is a large difference between the front and rear preview images, and the user experience is poor.
  • the motor pushes the lens a small distance, and the user of the preview interface perceives the jump of the image; in other camera components, the motor pushes the lens a large distance, and the user of the preview interface perceives the jump of the image Therefore, the size of the second threshold needs to be specifically considered according to device components.
  • the electronic device may determine the number of times to push the motor and the distance of each push of the motor according to the target position and the current position, and the length of the first step f. Electronics can determine how many times to push in, is rounded up. It can be understood that the number of times the electronic device pushes the motor and the distance between the target position and the current position is greater than the first step length, the electronic device can first push the motor according to the first step length, and when the distance between the motor position and the target position is less than the first step For a long time, push the motor directly to the target position.
  • the range of the first step length is 5-25 microns, preferably, the first step length is equal to the second threshold.
  • a is 100 microns
  • b is 155 microns
  • the first step length f is 15 microns
  • /k is pushed each time the motor. At this point, the electronic device can push the motor d times, 1 micron each time. For example, when a is 50 microns, b is 95 microns, and d is 15 microns, then l is (95-50)/15 3, and the electronic device pushes the motor 3 times, each pushing 15 microns.
  • the number of times d of pushing the motor should be limited, and the electronic device can reduce the number of times d of pushing as much as possible when the user does not perceive a jump in the position of the focusing frame.
  • the position of the focus frame in the preview screen is divided into multiple movements by pushing the motor multiple times, so that the user will not perceive jumping position changes of the focus frame, thereby improving user experience.
  • the electronic device determines the target position a and the current position b, it can directly push the motor from the current position to the target position.
  • the electronic device determines the target position a and the current position b, it can directly push the motor from the current position to the target position.
  • the above-mentioned target focus frame may be a center focus frame, and when the first focus frame of the electronic device exits, the first focus frame may be moved to the center focus frame.
  • the above is only a situation of moving the focus frame, without limitation.
  • the electronic device exits the first focusing frame when the first focusing frame does not satisfy the preset condition. For example, exit the face focus frame to the center focus frame.
  • the distance between the face focus frame and the corresponding motor position of the center focus frame is large, it can be divided into multiple times to move the motor position one by one; when the distance between the face focus frame and the center focus frame corresponding to the motor position is small, The motor position can be adjusted at one time.
  • the above method can ensure that the focus frame in the preview image moves gradually and smoothly, and will not cause the human eye to perceive a sudden change in the position of the focus frame, thereby improving user experience.
  • FIG. 20 is a schematic flowchart of another focusing method provided by an embodiment of the present application. As shown in FIG. 20, the focusing method includes steps S501-S507.
  • the method of exiting face focusing can be determined according to the current motor position and center position of the focus frame.
  • the distance between the current motor position of the focus frame and the center position is greater than a certain threshold, push the motor to the center position in multiple times; when the distance between the current motor position of the focus frame and the center position is not greater than the above threshold, Push the motor to the center position one at a time.
  • the size of the focus frame can be adjusted according to the rotation of the person's head in the focus frame.
  • step S501 Determine whether to restore the center focus frame. If yes, execute step S502; otherwise, execute step S505.
  • step S501 for the description of step S501, reference may be made to the relevant description of steps S101-S105 or S201-S203, and details are not repeated here.
  • step S502 Determine whether the absolute value of the difference between the target position and the current position is greater than a second threshold. If yes, execute step S503; otherwise, execute step S504.
  • step S502 for the description of step S502, reference may be made to the related description of step S401, and details are not repeated.
  • the target position is the position of the central focusing frame
  • the description of step S503 can refer to the relevant description of step S402, and no further description is required.
  • step S504 For the description of step S504, reference may be made to the related description of step S403, and details are not repeated.
  • step S505 For the description of step S505, reference may be made to the related description of step S301, and details are not repeated.
  • step S506 for the description of step S506, reference may be made to the related description of step S302, and details are not repeated.
  • step S507 for the description of step S507, reference may be made to the related description of step S303, and details are not repeated.
  • all or part of the functions may be implemented by software, hardware, or a combination of software and hardware.
  • software When implemented using software, it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored on a computer readable storage medium.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrated with one or more available media.
  • the available medium may be a magnetic medium (for example, a floppy disk, a hard disk, or a magnetic tape), an optical medium (for example, DVD), or a semiconductor medium (for example, a solid state disk (solid state disk, SSD)), etc.
  • a magnetic medium for example, a floppy disk, a hard disk, or a magnetic tape
  • an optical medium for example, DVD
  • a semiconductor medium for example, a solid state disk (solid state disk, SSD)
  • the processes can be completed by computer programs to instruct related hardware.
  • the programs can be stored in computer-readable storage media.
  • When the programs are executed may include the processes of the foregoing method embodiments.
  • the aforementioned storage medium includes: ROM or random access memory RAM, magnetic disk or optical disk, and other various media that can store program codes.

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Abstract

本申请实施例公开了一种对焦方法和电子设备，包括：响应于第一操作，电子设备开始拍摄，显示第一界面，第一界面显示通过摄像头采集到的预览画面；在第一时刻，电子设备在第一界面显示第K帧预览画面，第K帧预览画面是摄像头以第一目标的人脸为第一对焦框采集到的；在第K帧预览画面中，第一目标的人脸符合预设人脸识别条件；在第二时刻，电子设备在第一界面显示第M帧预览画面，第M帧预览画面是摄像头以第一对焦框进行对焦所采集到的；在第M帧预览画面中，第一目标的人脸不符合预设人脸识别条件；第二时刻在第一时刻之后；第M帧预览画面与第K帧预览画面之间的帧画面数目小于或等于预设阈值A。本申请实施例，可提高对焦画面稳定性。

Description

一种对焦方法和电子设备
本申请要求于2021年06月29日提交中国专利局、申请号为202110735216.2、申请名称为“一种对焦方法和电子设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本方案涉及电子技术领域，尤其涉及一种对焦(automatic focus，AF)方法和电子设备。
背景技术
目前，在手机、平板等电子设备上，相机应用是重要的应用之一。用户可通过电子设备上的相机应用记录和分享图片、视频。当前用户对拍照体验的要求越来越高。
当前在用户拍摄时，电子设备可以对画面中的被拍摄物进行对焦。随着被拍摄物的变动，对焦框也会发生变化，从而可以适应被拍物的变动，使得成像清晰。例如，当摄像头的画面中显示有人脸时，电子设备可以识别人脸，并对画面中的人脸处自动进行对焦，而当摄像头的画面中人脸突然消失或者变化时，电子设备可以将对焦框的调整到画面的中心位置。
然而，当对焦框需要频繁地调整时，预览画面中对焦框会呈现不稳定的变化，使得用户的拍摄体验差。
发明内容
本申请实施例公开一种对焦方法和电子设备，可以提高对焦画面稳定性。
第一方面，本申请实施例公开在一种对焦方法，包括：响应于第一操作，电子设备开始拍摄，显示第一界面，所述第一界面显示通过摄像头采集到的预览画面；在第一时刻，所述电子设备在所述第一界面显示第K帧预览画面，所述第K帧预览画面是所述摄像头以第一目标的人脸为第一对焦框采集到的；在所述第K帧预览画面中，所述第一目标的人脸符合预设人脸识别条件；在第二时刻，所述电子设备在所述第一界面显示第M帧预览画面，所述第M帧预览画面是所述摄像头以所述第一对焦框进行对焦所采集到的；在所述第M帧预览画面中，所述第一目标的人脸不符合所述预设人脸识别条件；所述第二时刻在所述第一时刻之后；所述第M帧预览画面与所述第K帧预览画面之间的帧画面数目小于或等于预设阈值A；所述K、M、A均为正整数。
其中，确定第一目标的人脸是否符合所述预设人脸识别条件过程可以参考为目标框的判断过程，即可以为目标框即人脸框，所述第一操作为用户开启相机应用的操作，A的值可以为参考S101中的描述。
在本申请实施例中，当第一目标的人脸不符合所述预设人脸识别条件时，可以延迟退出对焦框，减少预览画面中对焦目标的频繁变化，可以减少某一目标在取景框中呈现清晰与不清晰的画面变动次数，从而可以提高对焦画面稳定性，进而可以用户体验。
在一种可能的实现方式中，所述预设人脸识别条件包括所述第一目标的人脸框大于第一阈值，和/或，所述人脸框的中心点处于所述预览画面的边缘范围，所述边缘范围为所述 预览画面边缘的预定范围。这样，可以提高电子设备确定预览画面中人脸的准确性，从而可以提高用户体验。
其中，是否符合预设人脸识别条件的判定方法具体可以参考人脸是否存在于取景框的方法，即根据目标框的大小和/或位置判断能否检测到目标的方法。
在一种可能的实现方式中，所述方法还包括：所述方法还包括：在第三时刻，所述电子设备在所述第一界面显示第W帧预览画面，所述第W帧预览画面是所述摄像头以所述中心对焦框进行对焦所采集到的；在所述第W帧预览画面中，所述第一目标的人脸不符合所述预设人脸识别条件；所述第三时刻在所述第一时刻之后；在所述第W帧预览画面与所述第K帧预览画面之间的预览画面中，所述第一目标的人脸均不符合所述预设人脸识别条件；所述第W帧预览画面与所述第K帧预览画面之间的帧画面数目大于所述预设阈值A；所述W为正整数。
在一种可能的实现方式中，所述电子设备在所述第一界面显示第W帧预览画面，具体包括：在第三时刻，所述电子设备检测所述第三时刻之前A帧的预览画面；在所述连续A帧的预览画面的人脸均不符合所述预设人脸识别的情况下，所述电子设备基于所述中心对焦框确定目标位置，通过马达调整所述摄像头的焦距，通过所述摄像头采集所述第W帧预览画面，所述目标位置为所述中心对焦框的马达位置；所述电子设备显示所述第W帧预览画面。
在一种可能的实现方式中，所述电子设备基于所述中心对焦框确定目标位置，通过马达调整所述摄像头的焦距，通过所述摄像头采集所述第W预览画面，具体包括：当所述目标位置与当前马达位置的距离大于第二阈值时，通过马达调整多次所述摄像头的焦距，通过所述摄像头采集所述第W预览画面。这样，当电子设备需要调焦的情况下，当调焦的距离过大时，可以分为多次调焦，预览画面的对焦框的位置平滑移动，提高用户体验。
在一种可能的实现方式中，所述电子设备基于所述中心对焦框确定目标位置，通过马达调整所述摄像头的焦距，通过所述摄像头采集所述第W预览画面，具体包括：当所述目标位置与当前马达位置的距离不大于第二阈值时，通过马达调整一次所述摄像头的焦距，通过所述摄像头采集所述第W预览画面。
在一种可能的实现方式中，所述方法还包括：在第四时刻，所述电子设备在所述第一界面显示第S帧预览画面，所述第S帧预览画面是所述摄像头以所述第一对焦框进行对焦所采集到的；在所述第S帧预览画面中，所述第一目标的人脸不符合所述预设人脸识别条件；所述第四时刻在所述第一时刻之后；所述第K帧预览画面之前的连续B帧预览画面均符合所述预设人脸识别条件；在所述第S帧预览画面与所述第K帧预览画面之间的预览画面中，所述第一目标的人脸均不均符合所述预设人脸识别条件；所述第S帧预览画面与所述第K帧预览画面之间的帧画面数目小于或等于预设阈值A+C帧；所述S、B、C均为正整数。这样，当连续A帧的预览画面中的第一目标的人脸均不符合预设人脸识别条件时，电子设备可以根据A帧之前的连续B帧预览画面是否均符合预设人脸识别条件。当符合时，可以继续对第一对焦框进行对焦，否则退回中心退焦框。从而可以进一步减少预览画面中对焦目标的频繁变化，可以减少某一目标在取景框中呈现清晰与不清晰的画面变动次数，从而可以提高用户体验。
在一种可能的实现方式中，所述方法还包括：所述电子设备在所述第一界面显示第K帧预览画面，具体包括：在第五时刻，当人脸姿态角yaw大于第一角度时，所述电子设备在所述第一界面显示第K预览画面，所述第K预览画面中第一对焦框的高度与宽度的比值小于上一预览画面中对焦框的高度与宽度的比值，所述人脸姿态角yaw为人的头部上下转动的角度；在第六时刻，当人脸姿态角pitch大于第二角度时，所述电子设备在所述第一界面显示第K预览画面，所述第K预览画面中第一对焦框的高度与宽度的比值大于上一预览画面中对焦框的高度与宽度的比值，所述人脸姿态角pitch为人的头部沿着左右转动的角度。这样，第一对焦框中为符合预设人脸识别条件的人脸时，可以根据人脸的转动情况调整第一对焦框的长宽比，从而提高对焦的准确性。
其中，人脸姿态角yaw和/或pitch，以及第一角度和第二角度可以参考图17对应的描述。
第二方面，本申请实施例公开一种电子设备，包括：触控屏、摄像头、一个或多个处理器和一个或多个存储器，所述一个或多个存储器用于存储计算机程序代码，计算机程序代码包括计算机指令，当所述一个或多个处理器执行所述计算机指令时，以使得所述电子设备执行：响应于第一操作，开始拍摄，显示第一界面，所述第一界面显示通过摄像头采集到的预览画面；在第一时刻，在所述第一界面显示第K帧预览画面，所述第K帧预览画面是所述摄像头以第一目标的人脸为第一对焦框采集到的；在所述第K帧预览画面中，所述第一目标的人脸符合预设人脸识别条件；在第二时刻，在所述第一界面显示第M帧预览画面，所述第M帧预览画面是所述摄像头以所述第一对焦框进行对焦所采集到的；在所述第M帧预览画面中，所述第一目标的人脸不符合所述预设人脸识别条件；所述第二时刻在所述第一时刻之后；所述第M帧预览画面与所述第K帧预览画面之间的帧画面数目小于或等于预设阈值A；所述K、M、A均为正整数。
其中，确定第一目标的人脸是否符合所述预设人脸识别条件过程可以参考为目标框的判断过程，即可以为目标框即人脸框，所述第一操作为用户开启相机应用的操作，A的值可以为参考S101中的描述。
在本申请实施例中，当第一目标的人脸不符合所述预设人脸识别条件时，可以延迟退出对焦框，减少预览画面中对焦目标的频繁变化，可以减少某一目标在取景框中呈现清晰与不清晰的画面变动次数，从而可以提高对焦画面稳定性，进而可以用户体验。
在一种可能的实现方式中，所述预设人脸识别条件包括所述第一目标的人脸框大于第一阈值，和/或，所述人脸框的中心点处于所述预览画面的边缘范围，所述边缘范围为所述预览画面边缘的预定范围。这样，可以提高电子设备确定预览画面中人脸的准确性，从而可以提高用户体验。
其中，是否符合预设人脸识别条件的判定方法具体可以参考人脸是否存在于取景框的方法，即根据目标框的大小和/或位置判断能否检测到目标的方法。
在一种可能的实现方式中，所述电子设备还执行：在第三时刻，在所述第一界面显示第W帧预览画面，所述第W帧预览画面是所述摄像头以所述中心对焦框进行对焦所采集到的；在所述第W帧预览画面中，所述第一目标的人脸不符合所述预设人脸识别条件；所 述第三时刻在所述第一时刻之后；在所述第W帧预览画面与所述第K帧预览画面之间的预览画面中，所述第一目标的人脸均不符合所述预设人脸识别条件；所述第W帧预览画面与所述第K帧预览画面之间的帧画面数目大于所述预设阈值A；所述W为正整数。
在一种可能的实现方式中，所述电子设备在所述第一界面显示第W帧预览画面，具体执行：在第三时刻，检测所述第三时刻之前A帧的预览画面；在所述连续A帧的预览画面的人脸均不符合所述预设人脸识别的情况下，基于所述中心对焦框确定目标位置，通过马达调整所述摄像头的焦距，通过所述摄像头采集所述第W帧预览画面，所述目标位置为所述中心对焦框的马达位置；显示所述第W帧预览画面。
在一种可能的实现方式中，所述电子设备基于所述中心对焦框确定目标位置，通过马达调整所述摄像头的焦距，通过所述摄像头采集所述第W预览画面，具体执行：当所述目标位置与当前马达位置的距离大于第二阈值时，通过马达调整多次所述摄像头的焦距，通过所述摄像头采集所述第W预览画面。这样，当电子设备需要调焦的情况下，当调焦的距离过大时，可以分为多次调焦，预览画面的对焦框的位置平滑移动，提高用户体验。
在一种可能的实现方式中，所述电子设备基于所述中心对焦框确定目标位置，通过马达调整所述摄像头的焦距，通过所述摄像头采集所述第W预览画面，具体执行：当所述目标位置与当前马达位置的距离不大于第二阈值时，通过马达调整一次所述摄像头的焦距，通过所述摄像头采集所述第W预览画面。
在一种可能的实现方式中，所述电子设备还执行：在第四时刻，在所述第一界面显示第S帧预览画面，所述第S帧预览画面是所述摄像头以所述第一对焦框进行对焦所采集到的；在所述第S帧预览画面中，所述第一目标的人脸不符合所述预设人脸识别条件；所述第四时刻在所述第一时刻之后；所述第K帧预览画面之前的连续B帧预览画面均符合所述预设人脸识别条件；在所述第S帧预览画面与所述第K帧预览画面之间的预览画面中，所述第一目标的人脸均不均符合所述预设人脸识别条件；所述第S帧预览画面与所述第K帧预览画面之间的帧画面数目小于或等于预设阈值A+C帧；所述S、B、C均为正整数。这样，当连续A帧的预览画面中的第一目标的人脸均不符合预设人脸识别条件时，电子设备可以根据A帧之前的连续B帧预览画面是否均符合预设人脸识别条件。当符合时，可以继续对第一对焦框进行对焦，否则退回中心退焦框。从而可以进一步减少预览画面中对焦目标的频繁变化，可以减少某一目标在取景框中呈现清晰与不清晰的画面变动次数，从而可以提高用户体验。
在一种可能的实现方式中，所述电子设备在所述第一界面显示第K帧预览画面，具体执行：在第五时刻，当人脸姿态角yaw大于第一角度时，在所述第一界面显示第K预览画面，所述第K预览画面中第一对焦框的高度与宽度的比值小于上一预览画面中对焦框的高度与宽度的比值，所述人脸姿态角yaw为人的头部上下转动的角度；在第六时刻，当人脸姿态角pitch大于第二角度时，在所述第一界面显示第K预览画面，所述第K预览画面中第一对焦框的高度与宽度的比值大于上一预览画面中对焦框的高度与宽度的比值，所述人脸姿态角pitch为人的头部沿着左右转动的角度。这样，第一对焦框中为符合预设人脸识别条件的人脸时，可以根据人脸的转动情况调整第一对焦框的长宽比，从而提高对焦的准确性。
其中，人脸姿态角yaw和/或pitch，以及第一角度和第二角度可以参考图17对应的描述。
第三方面，本申请提供了一种电子设备，包括触控屏、摄像头、一个或多个处理器和一个或多个存储器。该一个或多个处理器与触控屏、摄像头、以及一个或多个存储器耦合，一个或多个存储器用于存储计算机程序代码，计算机程序代码包括计算机指令，当一个或多个处理器执行计算机指令时，使得电子设备执行上述任一方面任一项可能的实现方式中的对焦方法。
第四方面，本申请提供了一种电子设备，包括：一个或多个功能模块。一个或多个功能模块用于执行上述任一方面任一项可能的实现方式中的对焦方法。
第五方面，本申请实施例提供了一种计算机存储介质，包括计算机指令，当计算机指令在电子设备上运行时，使得计算机装置执行上述任一方面任一项可能的实现方式中的对焦方法。
第六方面，本申请实施例提供了一种计算机程序产品，当计算机程序产品在计算机上运行时，使得计算机执行上述任一方面任一项可能的实现方式中的对焦方法。
附图说明
下面对本申请实施例用到的附图进行介绍。
图1是本申请实施例示出的一组对焦预览界面的示意图；
图2是本申请实施例示出的一组对焦预览界面的示意图；
图3是本申请实施例示出的一组人脸对焦预览界面的示意图；
图4是本申请实施例示出的一组对焦预览界面的示意图；
图5是本申请实施例示出的一组对焦预览界面的示意图；
图6是本申请实施例示出的一组对焦预览界面的示意图；
图7是本申请实施例示出的一组对焦预览界面的示意图；
图8是本申请实施例示出的一组对焦预览界面的示意图；
图9是本申请实施例示出的一组对焦预览界面的示意图；
图10是本申请实施例示出的一组对焦预览界面的示意图；
图11是本申请实施例示出的一种电子设备100的结构示意图；
图12是本申请实施例示出的一种电子设备100的软件结构框图；
图13是本申请实施例示出的一种对焦方法的流程示意图；
图14是本申请实施例示出的一种对焦预览界面的示意图；
图15是本申请实施例示出的一组连续多帧预览画面的对焦情况示意图；
图16是本申请实施例示出的另一种对焦方法的流程示意图；
图17是本申请实施例示出的又一种对焦方法的流程示意图；
图18是本申请实施例示出的又一种人脸转动时的姿态角示意图；
图19是本申请实施例示出的又一种对焦方法的流程示意图；
图20是本申请实施例示出的又一种对焦方法的流程示意图。
具体实施方式
本申请以下实施例中所使用的术语只是为了描述特定实施例的目的，而并非旨在作为对本申请实施例的限制。如在本申请实施例的说明书和所附权利要求书中所使用的那样，单数表达形式“一个”、“一种”、“所述”、“上述”、“该”和“这一”旨在也包括复数表达形式，除非其上下文中明确地有相反指示。还应当理解，本申请实施例中使用的术语“和/或”是指并包含一个或多个所列出项目的任何或所有可能组合。
本申请实施例提供了一种对焦方法和电子设备。可以根据预览画面中的对焦框的位置和/或大小延迟退出对焦时间。当需要移动对焦框的位置时，可以根据对焦框需要移动的距离选择多次移动对焦框还是一次性移动对焦框。当需要调整人脸对焦框的大小时，可以根据头部的转动姿态角调整对焦框对应方向的长度。
上述的对焦方法中，电子设备可根据预览画面中的对焦框的位置和/或大小判断是否延迟退出对焦时间，可以提高对焦的稳定性。
下面介绍本申请实施例中相关的一些概念。
(1)对焦
对焦是指相机通过调整物距和焦距使得被拍物成像清晰的过程。电子设备通过调整聚焦镜头的位置获得最高的图片频率成分，以得到更高的图片对比度。其中，对焦是一个不断积累的过程，电子设备比较镜头在不同位置下拍摄的图片的对比度，从而获得图片的对比度最大时镜头的位置，进而确定对焦的焦距。
在电子设备拍摄过程中，对焦主要涉及摄像头模组的镜头、马达、马达驱动芯片和图像传感器(sensor)等器件。镜头(lens)用于接收光线，在电子设备可以包括一个或多个镜头。镜头一般可以由一片或几片透镜组成。图像传感器可以将穿过镜头的光线转化为电信号，之后将电信号转化为数字信号。马达用于推动镜片调整位置。马达驱动用于在自动对焦时确定马达推动镜头的位置。
其中，镜头和感光芯片是成像的主要器件，马达和马达驱动芯片是对焦的主要器件。当物体在分别在远景和近景的时候，对应的成像位置是不同的，需要调整镜头和感光芯片的距离，使得感光芯片上始终可以获得清晰的成像效果。对于电子设备摄像头模组来说，电子设备需要通过马达推动镜头，使得镜头与感光芯片之间的距离(焦距)，以及镜头与被拍摄物之间的距离(物距)发生变化。
(2)对焦的类型
常见的对焦类型可以分为三种，相位对焦(phase detection auto focus，PDAF)、反差对焦(contrast detection auto focus，CDAF)和激光对焦(laser detection auto focus，LDAF)。
相位对焦是将图像传感器中的左右成对的像素点分别与场景内的物体的进光量进行检测，对比左右两侧的相关值，找到对焦点，并将镜片的马达推到相应位置的对焦方法。
反差对焦也称的对比度对焦，是通过移动镜片来是对焦区域的图像达到最清新的对焦过程。当摄像头对准被拍摄物时，马达会将镜片从底部推到顶部，这个过程中，图像传感器会记录对比度等反差值，并找到反差最大的位置。马达将运动到顶部的镜片推到反差最 大的位置，完成最终的对焦。反差对焦可以理解为先完成记录所有图像信息的对比度，之后推动马达。
激光对焦是通过摄像头旁边的红外激光传感器向被拍摄物体发射低功率激光，经过反射后被传感器接收，并计算出与被摄物体之间的距离。之后镜间马达便直接将镜片推到相应位置，完成对焦。
首先，本申请实施例结合附图介绍一种对焦方法，通过该方法，电子设备在拍摄时，可以对目标进行对焦。目标可以包括人脸、动物、物体等。用户不需要点击屏幕进行对焦，电子设备就可以确定目标，并自动调整对焦框。电子设备无需用户操作，提升了用户体验。
图1示出了一组对焦预览界面的示意图，如图1中的(A)所示，电子设备可以一个放置有应用图标的页面10，该页面包括多个应用图标101(例如，天气应用图标、计算器应用图标、设置应用图标、邮件应用图标、音乐应用图标、视频应用图标、图库应用图标、相机应用图标等等)。多个应用图标下方还显示包括有页面指示符，以表明当前显示的页面与其他页面的位置关系。页面指示符的下方有多个托盘图标(例如拨号应用图标、信息应用图标、联系人应用图标)，托盘图标在页面切换时保持显示。在一些实施例中，上述页面也可以包括多个应用图标和页面指示符，页面指示符可以不是页面的一部分，单独存在，上述图片图标也是可选的，本申请实施例对此不作限制。
电子设备100可以接收用户作用于相机应用相机图标的输入操作(例如单击)，响应于该输入操作，电子设备100可以显示如图1中的(B)所示的拍摄界面20。
如图1中的(B)所示，该拍摄界面20可以包括有回显控件201、拍摄控件202、摄像头转换控件203、摄像头捕捉的画面(取景框)205、变焦倍率控件206A、设置控件206B、闪光灯开关206C、一个或多个拍摄模式控件204(例如，“夜景模式”控件204A、“人像模式”控件204B、“普通拍照模式”控件204C、“短视频”控件204D、“录像模式”控件204E、更多模式控件204F)。其中，该回显控件201可用于显示已拍摄的图像。该拍摄控件202用于触发保存摄像头拍摄到的图像。该摄像头转换控件203可用于切换拍照的摄像头。该设置控件206B可用于设置拍照功能。该变焦倍率控件206A可用于设置摄像头的变焦倍数。其中，该变焦倍率控件206B可以触发电子设备100显示变焦滑动条，该变焦滑动条可以接收用户的向上(或向下)滑动的操作，使得电子设备100增大(或减小)摄像头的变焦倍率。可能的，该变焦倍率控件206B可以电子设备100显示变焦增大控件和变焦增小控件，变焦增大控件可用于接收并响应于用户的输入，触发电子设备100增大摄像头的变焦倍率；变焦减小控件可用于接收并响应于用户的输入，触发电子设备100减小摄像头的变焦倍率。闪光灯开关206C可用于开启/关闭闪光灯。该拍摄模式控件可用于触发开启该拍摄模式对应的图像处理流程。例如，“夜景模式”控件204A可用于触发增加拍摄图像中的亮度和色彩丰富度等。“人像模式”控件204B可用于触发对拍摄图像中人物背景的虚化。图1中的(C)和图1中的(D)的描述可以参考图1中的(B)的描述，不加赘述。如图1中的(B)～(D)所示，当前用户选择的拍摄模式为“普通拍照模式”。
需要说明的是，在实际拍摄过程中，取景框中的对焦框存在，但对焦框可能显示出来，也可能不显示出来，本申请实施例不限定对焦框是否在取景框中显示。为了能够很清楚地 说明对焦的退出情况，图1中画出了对焦框表示未退出人脸对焦，不画出对焦框表示退出人脸对焦。
如图1中的(B)所示，取景框205中有舞蹈演员在跳舞，对焦框可以对焦到舞蹈演员的脸部。拍摄过程中，舞蹈演员的舞蹈动作不断变化，取景框中对焦框时而检测到人脸，时而检测不到人脸。
如图1中的(C)所示，随着舞蹈动作的变化，当舞蹈演员背对取景框时，取景框中的人脸对焦框捕捉找不到人脸。此时，电子设备退出人脸对焦框。
如图1中的(D)所示，当舞蹈演员重新正对取景框时，取景框中的人脸对焦框可以重新检测到人脸时，电子设备可以重新生成人脸对焦框。
上述对焦实现方式中，当电子设备开始拍摄之后，可以开始对人脸对焦。在拍摄过程中，电子设备对焦对象之间位置关系可以不断地发生变化。电子设备的对焦框可能会在短暂的时间内检测不到对应的目标(即对焦对象)，此时，电子设备会退出对上述对焦对象的对焦框。此后，当又能够检测到这个目标时，重新对目标进行对焦。在上述过程中的，目标在取景框中的反复的退出和出现，使得对焦框会在“消失”和“出现”之间变化，用户会看到的目标时而清晰，时而不清晰。这样，用户体验差。
针对上述实现方式的问题，本申请实施例提供了一种对焦方法，该方法包括：电子设备检测不到目标时，可以判断是否连续多帧检测不到目标。如果是，继续恢复对焦框到中心对焦框(即退出这一对焦框)；否则，获取这一对焦框(不退出这一对焦框)。这样，延迟退出对焦框，可以减少取景框中对焦目标的频繁变化，可以减少某一目标在取景框中呈现清晰与不清晰的画面变动次数，从而可以提高用户体验。
下面结合应用场景，介绍本申请实施例涉及的一种对焦方法。
在一些应用场景中，电子设备100可以先判断是否能够检测到目标时，当检测不到目标时，延迟退出对焦框。即当连续多帧均检测不到目标时，可以退出对焦框；否则，可以不退出对焦框。其中，电子设备在拍摄时，可以根据取景框中的对焦框的大小和/或位置判断是否能够连续多帧检测到目标。
图2示出了一组对焦预览界面的示意图。如图2中的(A)所示，图2中的(A)的描述可以参考图1中的(A)对应的描述，不加赘述。
电子设备100可以接收用户作用于相机应用相机图标的输入操作(例如单击)，响应于该输入操作，电子设备100可以显示如图2中的(B)所示的拍摄界面20。
如图2中的(B)所示，图2中的(B)具体描述可以参考图1中的(B)的表述，不加赘述。如图2中的(B)所示，当前用户可以选择的拍摄模式为“普通拍照模式”，此处对拍摄模式不做限定。
如图2中的(B)所示，取景框205中有舞蹈演员在跳舞，对焦框可以对焦到舞蹈演员的脸部。拍摄过程中，舞蹈演员的舞蹈动作不断变化，取景框中对焦框时而检测到人脸，时而检测不到人脸。其中，目标是人脸。
图2中的(C)的描述也可以参考图1中的(B)的描述，不加赘述。如图2中的(C)所示，随着舞蹈动作的变化，当舞蹈演员背对取景框时，取景框中的人脸对焦框捕捉(检 测)找不到人脸。在本申请实施例中，电子设备可以确定是否连续几帧(例如，8帧)的取景框中均检测不到人脸，如果是，可以退出人脸对焦框；否则，可以不退出人脸退焦框。即本申请可以多检测几帧预览画面，从而可以延迟人脸对焦的退出时间。
一种可能的情况下，当电子设备连续几帧至少一帧检测到目标时，保持对焦框不退出。重新检测到人脸时，可以移动对焦框到相应位置。
图3示出了一组人脸对焦预览界面的示意图。连续几帧中存在可以检测到脸的取景框，可以保持人脸对焦框。如图3中的(A)所示，当检测不到人脸时，电子设备可以在连续几帧内保持人脸对焦框不退出。如图3中的(B)所示，在连续几秒内，当舞蹈演员重新正对取景框时，取景框中的人脸对焦框可以重新捕捉到人脸时，人脸对焦框可以继续对焦到人脸的位置。这样的情况下，即便短暂时间内检测不到人脸，人脸对焦框可以依然不退出，当重新检测到人脸时，移动人脸对焦框的到人脸位置即可。其中，图3中的(A)和(B)的描述也可以参考图1中的(B)的描述，不加赘述。
另一种可能的情况下，当电子设备连续几帧均检测不到目标时，在这连续几帧保持对焦框不退出，之后可以退出对焦框。重新检测到人脸时，可以重新开启对目标的对焦框。
图4示出了一组对焦预览界面的示意图。连续几帧中均不存在可以检测到脸的取景框，可以退出人脸对焦。如图4中的(A)所示，当检测不到人脸时，电子设备可以在连续几帧内保持人脸对焦框不退出。如图4中的(B)所示，在连续几秒内，当舞蹈演员依然背对取景框时，取景框中依然不能捕捉到人脸时，人脸对焦框可以退出人脸对焦框。如图4中的(C)所示，当随时舞动动作的变化，舞蹈演员又正对取景框时，可以重新检测到人脸时，可以重新对人脸进行对焦。其中，图4中的(A)～(C)的描述也可以参考图1中的(B)的描述，不加赘述。
进一步地，下面结合应用场景，介绍本申请实施例涉及的检测人脸是否存在于取景框的方法(即能够捕捉或检测到目标的方法)。
实现方式1：根据人脸框的大小判断能否检测到人脸。
图5示出了一组对焦预览界面的示意图。当经过如图1中的(A)所示的操作，电子设备可以显示如图5中的(A)所示的界面示意图。其中，图5中的(A)和图5中的(B)的描述可以参考图1中的(B)，不加赘述。如图3中的(A)所示，在取景框中，电子设备可以对焦人脸。当人越来越远时，人脸对焦框变小。如图3中的(B)所示，当对焦框小于一定值(例如，30*30像素值)时，可以确定检测(捕捉)不到人脸。
需要说明的是，人脸框变小的情况不限定于人距离摄像头越来越远，也可以是，人转头或低头；还可以是人的走出了取景框的范围等等。对于上述各种情形，本申请不加限定。
实现方式2：根据人脸框的位置判断能否检测到人脸。
图6示出了一组对焦预览界面的示意图。当经过如图1中的(A)所示的操作，电子设备可以显示如图6中的(A)所示的界面示意图。其中，图6中的(A)和图6中的(B)的描述可以参考图1中的(B)，不加赘述。如图6中的(A)所示，在取景框中，电子设备可以对焦人脸。当人在移动的过程中，人脸从取景框中间位置移动到边缘位置。如图6中的(B)所示，当对焦框的位置处于取景框的边缘位置时，可以确定检测不到人脸。其中， 对焦框的位置处于取景框的边缘位置可以是对焦框的中心点处于边缘位置，对焦框的中心点为对焦框的几何中心，取景框的边缘位置可以为取景框边界往里的一定范围(例如，取景框往内20像素值的区域范围)，例如，图6中的(B)中虚线以外的取景框范围。
其中，检测的对象可以不限于人脸，还可以是动物、车辆等物体，不加限定。
需要说明的是，在具体判断能够检测到人脸的过程中，可以选择上述的实施方式1和实施方式2作为判定能否检测到人脸的依据，也可以两个实施方式均作为判定依据。当实施方式1和实施方式2作为判定依据时，满足上述两种实施方式其中的一种，便可以确定检测不到人脸。此外，实施方式1和实施方式2的判断顺序不加限定。
下面结合应用场景，介绍本申请实施例涉及的另一种对焦方法。
图7示出了一组对焦预览界面的示意图。图7的描述，可以参考图1中(B)的描述，不加赘述。
针对人脸低头、仰头或侧头时，对焦方式有：
实现方式1：人脸对焦框的高和宽等比例缩小。
如图7中的(A)所示，取景框中显示人的正脸，电子设备可以对人脸进行对焦。如图7中的(B)所示，当人脸低头时，取景框的大小随之变小，即按照高和宽等比例调小对焦框。
上述实现方式中的对焦方案中，人脸在低头的过程中，人脸上下的高度是变小的，但左右的宽度不变，当对焦框的宽度和高度在变小过程中保持相同时(高和宽等比例缩小)，边缘部分的人脸对焦不到，出现对焦框不够的大，使得对焦范围不完整的问题。
需要说明的是，上述仅仅是举例人低头过程中，人脸对焦框会变小的情形。当人抬头，侧头或转头时，人脸对焦框会以相同的方式变小。此处不加限定。
实现方式2：保持人脸对焦框的大小不变。
如图7中的(C)所示，取景框中显示人的正脸，电子设备可以对人脸进行对焦。如图7中的(D)所示，当人脸低头时，取景框的大小保持不变。
上述实现方式的对焦方案中，人脸在低头的过程中，人脸上下的高度是变小的，但左右的宽度不变，当对焦框的大小保持不变时，对焦框上下边缘的部分并不能够对焦到人脸，而是出现了对焦漏空。
需要说明的是，上述仅仅是举例人低头过程中，人脸对焦框会变小的情形。当人抬头，侧头或转头时，人脸对焦框会以相同的方式变小。此处不加限定。
上述的两种实现方式中，随着人头部的转动时，人脸对焦框调整太小，会导致对焦框太小，部分人脸对焦不到；人脸对焦框保持不变，出现对焦框漏空现象。因此，均不能够在人侧脸，低头和抬头等场景中准确地对人脸进行对焦。
针对上述实现方式，电子设备可以根据人脸转动的方向来对应调整人脸对焦框的高度和/或宽度。当人脸上下转动时(低头或抬头)，电子设备可以调小对焦框上下的高度，并保持左右宽度不变；当人脸左右转动时(侧头或摇头)，电子设备可以调小对焦框左右的宽度，并保持上下高度不变。这样，电子设备可以只在头部转动的方向上调小对焦框，从而可以避免对焦框过大出现漏空以及对焦框过小出现对焦不完整的问题，以提高对焦的准确 性。
图8示出了一组对焦预览界面的示意图。图8中的(A)～(D)的描述，可以参考图1中的(B)的描述，不加赘述。
如图8中的(A)所示，当取景框中显示人的正脸，电子设备可以对人的正脸进行对焦，其中，对焦框的高(上下)为x，宽为y，x与y可以相等，也可以不相等。如图8中的(B)所示，当人脸(头部)在上下(竖直)方向转动时，可以调小x。例如，电子设备可以检测上下转动的人脸的姿态角，当上下转动的姿态角大于一定角度时，可以将x调整为3/4x。
需要说明的是，姿态角为人头部转动的角度，上下转动的姿态角为头部在上下方向上(低头或抬头)转动的角度。当人脸正对屏幕时，上下方向的姿态角为零度，上述调整x不限于低头的动作，还可以是抬头，仰头，点头等在上下方向上的头部转动的动作。
如图8中的(C)所示的描述可以参考图8中的(A)的表述，不加赘述。如图8中的(D)所示，当人脸在水平方向发生转动(左右转头或侧头)时，电子设备可以将y调小。例如，电子设备可以检测人脸左右(水平)转动的姿态角，当左右转动的姿态角大于一定角度时，可以将y调整为3/4y。
需要说明的是，左右转动的姿态角可以为头部左右转动的角度，当人脸正对屏幕时，水平转动的姿态角也为零度。上述调整y不限于向左转头的动作，还可以是右转头，摇头等在水平方向上的头部转动的动作。
应理解，调整对焦框的大小时，可以只调整x，也可以只调整y，还可以x和y都调整。
需要说明的是，当人从低头，仰头、侧头等动作回到正脸对取景框时，对焦框可以对应调整到原来的大小，即可以与图8中的过程正好相反。
下面结合应用场景，介绍本申请实施例涉及的又一种对焦方法。
下面结合场景介绍了一种退出人脸对焦框的实现方式。
图9示出了一组对焦预览界面的示意图。经过图1中的(A)的用户操作，可以得到图9中的(A)所示的用户界面，图9中的(A)和图9中的(B)的描述可以参考图1中的(B)的表述，不加赘述。如图9中的(A)所示，电子设备可以对焦到人脸，当电子设备确定要退出人脸对焦框时，可以将对焦框移动到中心对焦框的位置。其中，中心对焦框为对焦框位于取景框的几何中心的对焦框。
在上述人脸对焦框退出的整个过程中，人脸对焦框一次性移动到中心对焦框的位置，从而完成人脸对焦框的退出。这样，当前的人脸对焦框到中心对焦框的距离较长时，一次性的移动会使对焦框位置发生明显的跳动，用户体验差。
针对上述实现方式，本申请实施例提出一种对焦方式：当需要退出人脸对焦框时，电子设备可以确定当前人脸对焦框与中心对焦框之间的距离。当距离大于一定值时，可以分为多次移动人脸对焦框到中心对焦框；当距离小于上述一定值时，可以一次性将人脸对焦框到中心对焦框。
一种可能的实现方式下，电子设备可以分多次移动人脸对焦框到中心对焦框。
图10示出了一组对焦预览界面的示意图。经过图1中的(A)的用户操作，可以得到 图10中的(A)所示的用户界面，图10中的(A)、(B)、(C)和(D)的描述可以参考图1中的(B)的表述，不加赘述。当取景框中显示有人脸时，可以对人脸进行对焦。当判定需要退出人脸对焦框时，电子设备可以从当前人脸对焦框位置向中心对焦框进行移动。如图10中的(A)、(B)、(C)和(D)所示，一共移动3次将对焦框移动到中心对焦框，每次的移动方向都是靠近中心对焦框的方向。
需要说明的是，上述移动次数仅仅是举例说明，并不构成限定。
另一种可能的实现方式下，电子设备可以一次性移动人脸对焦框到中心对焦框。
当人脸对焦框距离中心对焦框小于一定值时，可以直接将人脸对焦框移动到中心对焦框，具体实现方式可以参考图9的实现方式，不加赘述。
通过上述的实现方式，电子设备退出对焦框时，可以实现对焦框的平滑移动，可以减少对焦框位置跳变的状况，从而可以提高用户体验。
需要说明的是，上述的退出人脸对焦框的过程为一种平滑移动对焦框位置的过程，移动对焦框的场景本实施例均可适用。
下面介绍本申请实施例涉及的电子设备。
图11示出了电子设备100的结构示意图。
电子设备100可以包括处理器110，外部存储器接口120，内部存储器121，通用串行总线(universal serial bus，USB)接口130，充电管理模块140，电源管理模块141，电池142，天线1，天线2，移动通信模块150，无线通信模块160，音频模块170，扬声器170A，受话器170B，麦克风170C，耳机接口170D，传感器模块180，按键190，马达191，指示器192，摄像头193，显示屏194，以及用户标识模块(subscriber identification module，SIM)卡接口195等。其中传感器模块180可以包括压力传感器180A，陀螺仪传感器180B，气压传感器180C，磁传感器180D，加速度传感器180E，距离传感器180F，接近光传感器180G，指纹传感器180H，温度传感器180J，触摸传感器180K，环境光传感器180L，骨传导传感器180M等。
可以理解的是，本发明实施例示意的结构并不构成对电子设备100的具体限定。在本申请另一些实施例中，电子设备100可以包括比图示更多或更少的部件，或者组合某些部件，或者拆分某些部件，或者不同的部件布置。图示的部件可以以硬件，软件或软件和硬件的组合实现。
处理器110可以包括一个或多个处理单元，例如：处理器110可以包括应用处理器(application processor，AP)，调制解调处理器，图形处理器(graphics processing unit，GPU)，图像信号处理器(image signal processor，ISP)，控制器，存储器，视频编解码器，数字信号处理器(digital signal processor，DSP)，基带处理器，和/或神经网络处理器(neural-network processing unit，NPU)等。其中，不同的处理单元可以是独立的器件，也可以集成在一个或多个处理器中。
其中，控制器可以是电子设备100的神经中枢和指挥中心。控制器可以根据指令操作码和时序信号，产生操作控制信号，完成取指令和执行指令的控制。
处理器110中还可以设置存储器，用于存储指令和数据。在一些实施例中，处理器110 中的存储器为高速缓冲存储器。该存储器可以保存处理器110刚用过或循环使用的指令或数据。如果处理器110需要再次使用该指令或数据，可从所述存储器中直接调用。避免了重复存取，减少了处理器110的等待时间，因而提高了系统的效率。
在一些实施例中，处理器110可以包括一个或多个接口。接口可以包括集成电路(inter-integrated circuit，I2C)接口，集成电路内置音频(inter-integrated circuit sound，I2S)接口，脉冲编码调制(pulse code modulation，PCM)接口，通用异步收发传输器(universal asynchronous receiver/transmitter，UART)接口，移动产业处理器接口(mobile industry processor interface，MIPI)，通用输入输出(general-purpose input/output，GPIO)接口，用户标识模块(subscriber identity module，SIM)接口，和/或通用串行总线(universal serial bus，USB)接口等。
I2C接口是一种双向同步串行总线，包括一根串行数据线(serial data line，SDA)和一根串行时钟线(derail clock line，SCL)。在一些实施例中，处理器110可以包含多组I2C总线。处理器110可以通过不同的I2C总线接口分别耦合触摸传感器180K，充电器，闪光灯，摄像头193等。例如：处理器110可以通过I2C接口耦合触摸传感器180K，使处理器110与触摸传感器180K通过I2C总线接口通信，实现电子设备100的触摸功能。
I2S接口可以用于音频通信。在一些实施例中，处理器110可以包含多组I2S总线。处理器110可以通过I2S总线与音频模块170耦合，实现处理器110与音频模块170之间的通信。在一些实施例中，音频模块170可以通过I2S接口向无线通信模块160传递音频信号，实现通过蓝牙耳机接听电话的功能。
PCM接口也可以用于音频通信，将模拟信号抽样，量化和编码。在一些实施例中，音频模块170与无线通信模块160可以通过PCM总线接口耦合。在一些实施例中，音频模块170也可以通过PCM接口向无线通信模块160传递音频信号，实现通过蓝牙耳机接听电话的功能。所述I2S接口和所述PCM接口都可以用于音频通信。
UART接口是一种通用串行数据总线，用于异步通信。该总线可以为双向通信总线。它将要传输的数据在串行通信与并行通信之间转换。在一些实施例中，UART接口通常被用于连接处理器110与无线通信模块160。例如：处理器110通过UART接口与无线通信模块160中的蓝牙模块通信，实现蓝牙功能。在一些实施例中，音频模块170可以通过UART接口向无线通信模块160传递音频信号，实现通过蓝牙耳机播放音乐的功能。
MIPI接口可以被用于连接处理器110与显示屏194，摄像头193等外围器件。MIPI接口包括摄像头串行接口(camera serial interface，CSI)，显示屏串行接口(display serial interface，DSI)等。在一些实施例中，处理器110和摄像头193通过CSI接口通信，实现电子设备100的拍摄功能。处理器110和显示屏194通过DSI接口通信，实现电子设备100的显示功能。
GPIO接口可以通过软件配置。GPIO接口可以被配置为控制信号，也可被配置为数据信号。在一些实施例中，GPIO接口可以用于连接处理器110与摄像头193，显示屏194，无线通信模块160，音频模块170，传感器模块180等。GPIO接口还可以被配置为I2C接口，I2S接口，UART接口，MIPI接口等。
USB接口130是符合USB标准规范的接口，具体可以是Mini USB接口，Micro USB 接口，USB Type C接口等。USB接口130可以用于连接充电器为电子设备100充电，也可以用于电子设备100与外围设备之间传输数据。也可以用于连接耳机，通过耳机播放音频。该接口还可以用于连接其他电子设备，例如AR设备等。
可以理解的是，本发明实施例示意的各模块间的接口连接关系，只是示意性说明，并不构成对电子设备100的结构限定。在本申请另一些实施例中，电子设备100也可以采用上述实施例中不同的接口连接方式，或多种接口连接方式的组合。
充电管理模块140用于从充电器接收充电输入。其中，充电器可以是无线充电器，也可以是有线充电器。在一些有线充电的实施例中，充电管理模块140可以通过USB接口130接收有线充电器的充电输入。在一些无线充电的实施例中，充电管理模块140可以通过电子设备100的无线充电线圈接收无线充电输入。充电管理模块140为电池142充电的同时，还可以通过电源管理模块141为电子设备供电。
电源管理模块141用于连接电池142，充电管理模块140与处理器110。电源管理模块141接收电池142和/或充电管理模块140的输入，为处理器110，内部存储器121，外部存储器，显示屏194，摄像头193，和无线通信模块160等供电。电源管理模块141还可以用于监测电池容量，电池循环次数，电池健康状态(漏电，阻抗)等参数。在其他一些实施例中，电源管理模块141也可以设置于处理器110中。在另一些实施例中，电源管理模块141和充电管理模块140也可以设置于同一个器件中。
电子设备100的无线通信功能可以通过天线1，天线2，移动通信模块150，无线通信模块160，调制解调处理器以及基带处理器等实现。
天线1和天线2用于发射和接收电磁波信号。电子设备100中的每个天线可用于覆盖单个或多个通信频带。不同的天线还可以复用，以提高天线的利用率。例如：可以将天线1复用为无线局域网的分集天线。在另外一些实施例中，天线可以和调谐开关结合使用。
移动通信模块150可以提供应用在电子设备100上的包括2G/3G/4G/5G等无线通信的解决方案。移动通信模块150可以包括至少一个滤波器，开关，功率放大器，低噪声放大器(low noise amplifier，LNA)等。移动通信模块150可以由天线1接收电磁波，并对接收的电磁波进行滤波，放大等处理，传送至调制解调处理器进行解调。移动通信模块150还可以对经调制解调处理器调制后的信号放大，经天线1转为电磁波辐射出去。在一些实施例中，移动通信模块150的至少部分功能模块可以被设置于处理器110中。在一些实施例中，移动通信模块150的至少部分功能模块可以与处理器110的至少部分模块被设置在同一个器件中。
调制解调处理器可以包括调制器和解调器。其中，调制器用于将待发送的低频基带信号调制成中高频信号。解调器用于将接收的电磁波信号解调为低频基带信号。随后解调器将解调得到的低频基带信号传送至基带处理器处理。低频基带信号经基带处理器处理后，被传递给应用处理器。应用处理器通过音频设备(不限于扬声器170A，受话器170B等)输出声音信号，或通过显示屏194显示图片或视频。在一些实施例中，调制解调处理器可以是独立的器件。在另一些实施例中，调制解调处理器可以独立于处理器110，与移动通信模块150或其他功能模块设置在同一个器件中。
无线通信模块160可以提供应用在电子设备100上的包括无线局域网(wireless local  area networks，WLAN)(如无线保真(wireless fidelity，Wi-Fi)网络)，蓝牙(bluetooth，BT)，全球导航卫星系统(global navigation satellite system，GNSS)，调频(frequency modulation，FM)，近距离无线通信技术(near field communication，NFC)，红外技术(infrared，IR)等无线通信的解决方案。无线通信模块160可以是集成至少一个通信处理模块的一个或多个器件。无线通信模块160经由天线2接收电磁波，将电磁波信号调频以及滤波处理，将处理后的信号发送到处理器110。无线通信模块160还可以从处理器110接收待发送的信号，对其进行调频，放大，经天线2转为电磁波辐射出去。
在一些实施例中，电子设备100的天线1和移动通信模块150耦合，天线2和无线通信模块160耦合，使得电子设备100可以通过无线通信技术与网络以及其他设备通信。所述无线通信技术可以包括全球移动通讯系统(global system for mobile communications，GSM)，通用分组无线服务(general packet radio service，GPRS)，码分多址接入(code division multiple access，CDMA)，宽带码分多址(wideband code division multiple access，WCDMA)，时分码分多址(time-division code division multiple access，TD-SCDMA)，长期演进(long term evolution，LTE)，BT，GNSS，WLAN，NFC，FM，和/或IR技术等。所述GNSS可以包括全球卫星定位系统(global positioning system，GPS)，全球导航卫星系统(global navigation satellite system，GLONASS)，北斗卫星导航系统(beidou navigation satellite system，BDS)，准天顶卫星系统(quasi-zenith satellite system，QZSS)和/或星基增强系统(satellite based augmentation systems，SBAS)。
电子设备100通过GPU，显示屏194，以及应用处理器等实现显示功能。GPU为图像处理的微处理器，连接显示屏194和应用处理器。GPU用于执行数学和几何计算，用于图形渲染。处理器110可包括一个或多个GPU，其执行程序指令以生成或改变显示信息。
显示屏194用于显示图片，视频等。显示屏194包括显示面板。显示面板可以采用液晶显示屏(liquid crystal display，LCD)，有机发光二极管(organic light-emitting diode，OLED)，有源矩阵有机发光二极体或主动矩阵有机发光二极体(active-matrix organic light emitting diode的，AMOLED)，柔性发光二极管(flex light-emitting diode，FLED)，Miniled，MicroLed，Micro-oLed，量子点发光二极管(quantum dot light emitting diodes，QLED)等。在一些实施例中，电子设备100可以包括1个或N个显示屏194，N为大于1的正整数。
电子设备100可以通过ISP，摄像头193，视频编解码器，GPU，显示屏194以及应用处理器等实现采集功能，以实现本申请实施例中HAL层的图像采集模块。
ISP用于处理摄像头193反馈的数据。例如，拍照时，打开快门，光线通过镜头被传递到摄像头感光元件上，光信号转换为电信号，摄像头感光元件将所述电信号传递给ISP处理，转化为肉眼可见的图片或视频。ISP还可以对图片的噪点，亮度，肤色进行算法优化。ISP还可以对拍摄场景的曝光，色温等参数优化。在一些实施例中，ISP可以设置在摄像头193中。
摄像头193用于捕获静态图片或视频。物体通过镜头生成光学图像投射到感光元件。感光元件可以是电荷耦合器件(charge coupled device，CCD)或互补金属氧化物半导体(complementary metal-oxide-semiconductor，CMOS)光电晶体管。感光元件把光信号转换成电信号，之后将电信号传递给ISP转换成数字图片或视频信号。ISP将数字图片或视频信 号输出到DSP加工处理。DSP将数字图片或视频信号转换成标准的RGB，YUV等格式的图片或视频信号。在一些实施例中，电子设备100可以包括1个或N个摄像头193，N为大于1的正整数。摄像头可以包括镜头、对焦马达和图像传感器(即摄像头感光元件)，对焦马达可以推动镜头调整对焦。
数字信号处理器用于处理数字信号，除了可以处理数字图片或视频信号，还可以处理其他数字信号。例如，当电子设备100在频点选择时，数字信号处理器用于对频点能量进行傅里叶变换等。
视频编解码器用于对数字视频压缩或解压缩。电子设备100可以支持一种或多种视频编解码器。这样，电子设备100可以播放或录制多种编码格式的视频，例如：动态图像专家组(moving picture experts group，MPEG)1，MPEG2，MPEG3，MPEG4等。
NPU为神经网络(neural-network，NN)计算处理器，通过借鉴生物神经网络结构，例如借鉴人脑神经元之间传递模式，对输入信息快速处理，还可以不断的自学习。通过NPU可以实现电子设备100的智能认知等应用，例如：图像识别，人脸识别，语音识别，文本理解等。
外部存储器接口120可以用于连接外部存储卡，例如Micro SD卡，实现扩展电子设备100的存储能力。外部存储卡通过外部存储器接口120与处理器110通信，实现数据存储功能。例如将音乐，视频等文件保存在外部存储卡中。
内部存储器121可以用于存储计算机可执行程序代码，所述可执行程序代码包括指令。处理器110通过运行存储在内部存储器121的指令，从而执行电子设备100的各种功能应用以及数据处理。内部存储器121可以包括存储程序区和存储数据区。其中，存储程序区可存储操作系统，至少一个功能所需的应用程序(比如声音播放功能，图片或视频播放功能等)等。存储数据区可存储电子设备100使用过程中所创建的数据(比如音频数据，电话本等)等。此外，内部存储器121可以包括高速随机存取存储器，还可以包括非易失性存储器，例如至少一个磁盘存储器件，闪存器件，通用闪存存储器(universal flash storage，UFS)等。
电子设备100可以通过音频模块170，扬声器170A，受话器170B，麦克风170C，耳机接口170D，以及应用处理器等实现音频功能。例如音乐播放，录音等。
音频模块170用于将数字音频信息转换成模拟音频信号输出，也用于将模拟音频输入转换为数字音频信号。音频模块170还可以用于对音频信号编码和解码。在一些实施例中，音频模块170可以设置于处理器110中，或将音频模块170的部分功能模块设置于处理器110中。
扬声器170A，也称“喇叭”，用于将音频电信号转换为声音信号。电子设备100可以通过扬声器170A收听音乐，或收听免提通话。
受话器170B，也称“听筒”，用于将音频电信号转换成声音信号。当电子设备100接听电话或语音信息时，可以通过将受话器170B靠近人耳接听语音。
麦克风170C，也称“话筒”，“传声器”，用于将声音信号转换为电信号。当拨打电话或发送语音信息时，用户可以通过人嘴靠近麦克风170C发声，将声音信号输入到麦克风170C。电子设备100可以设置至少一个麦克风170C。在另一些实施例中，电子设备100可以设置 两个麦克风170C，除了采集声音信号，还可以实现降噪功能。在另一些实施例中，电子设备100还可以设置三个，四个或更多麦克风170C，实现采集声音信号，降噪，还可以识别声音来源，实现定向录音功能等。
耳机接口170D用于连接有线耳机。耳机接口170D可以是USB接口130，也可以是3.5mm的开放移动电子设备平台(open mobile terminal platform，OMTP)标准接口，美国蜂窝电信工业协会(cellular telecommunications industry association of the USA，CTIA)标准接口。
压力传感器180A用于感受压力信号，可以将压力信号转换成电信号。在一些实施例中，压力传感器180A可以设置于显示屏194。压力传感器180A的种类很多，如电阻式压力传感器，电感式压力传感器，电容式压力传感器等。电容式压力传感器可以是包括至少两个具有导电材料的平行板。当有力作用于压力传感器180A，电极之间的电容改变。电子设备100根据电容的变化确定压力的强度。当有触摸操作作用于显示屏194，电子设备100根据压力传感器180A检测所述触摸操作强度。电子设备100也可以根据压力传感器180A的检测信号计算触摸的位置。在一些实施例中，作用于相同触摸位置，但不同触摸操作强度的触摸操作，可以对应不同的操作指令。例如：当有触摸操作强度小于第一压力阈值的触摸操作作用于短消息应用图标时，执行查看短消息的指令。当有触摸操作强度大于或等于第一压力阈值的触摸操作作用于短消息应用图标时，执行新建短消息的指令。
陀螺仪传感器180B可以用于确定电子设备100的运动姿态。在一些实施例中，可以通过陀螺仪传感器180B确定电子设备100围绕三个轴(即，x，y和z轴)的角速度。陀螺仪传感器180B可以用于拍摄防抖。示例性的，当按下快门，陀螺仪传感器180B检测电子设备100抖动的角度，根据角度计算出镜头模组需要补偿的距离，让镜头通过反向运动抵消电子设备100的抖动，实现防抖。陀螺仪传感器180B还可以用于导航，体感游戏场景。
气压传感器180C用于测量气压。在一些实施例中，电子设备100通过气压传感器180C测得的气压值计算海拔高度，辅助定位和导航。
磁传感器180D包括霍尔传感器。电子设备100可以利用磁传感器180D检测翻盖皮套的开合。在一些实施例中，当电子设备100是翻盖机时，电子设备100可以根据磁传感器180D检测翻盖的开合。进而根据检测到的皮套的开合状态或翻盖的开合状态，设置翻盖自动解锁等特性。
加速度传感器180E可检测电子设备100在各个方向上(一般为三轴)加速度的大小。当电子设备100静止时可检测出重力的大小及方向。还可以用于识别电子设备姿态，应用于横竖屏切换，计步器等应用。
距离传感器180F，用于测量距离。电子设备100可以通过红外或激光测量距离。在一些实施例中，拍摄场景，电子设备100可以利用距离传感器180F测距以实现快速对焦。
接近光传感器180G可以包括例如发光二极管(LED)和光检测器，例如光电二极管。发光二极管可以是红外发光二极管。电子设备100通过发光二极管向外发射红外光。电子设备100使用光电二极管检测来自附近物体的红外反射光。当检测到充分的反射光时，可以确定电子设备100附近有物体。当检测到不充分的反射光时，电子设备100可以确定电子设备100附近没有物体。电子设备100可以利用接近光传感器180G检测用户手持电子 设备100贴近耳朵通话，以便自动熄灭屏幕达到省电的目的。接近光传感器180G也可用于皮套模式，口袋模式自动解锁与锁屏。
环境光传感器180L用于感知环境光亮度。电子设备100可以根据感知的环境光亮度自适应调节显示屏194亮度。环境光传感器180L也可用于拍照时自动调节白平衡。环境光传感器180L还可以与接近光传感器180G配合，检测电子设备100是否在口袋里，以防误触。
指纹传感器180H用于采集指纹。电子设备100可以利用采集的指纹特性实现指纹解锁，访问应用锁，指纹拍照，指纹接听来电等。
温度传感器180J用于检测温度。在一些实施例中，电子设备100利用温度传感器180J检测的温度，执行温度处理策略。例如，当温度传感器180J上报的温度超过阈值，电子设备100执行降低位于温度传感器180J附近的处理器的性能，以便降低功耗实施热保护。在另一些实施例中，当温度低于另一阈值时，电子设备100对电池142加热，以避免低温导致电子设备100异常关机。在其他一些实施例中，当温度低于又一阈值时，电子设备100对电池142的输出电压执行升压，以避免低温导致的异常关机。
触摸传感器180K，也称“触控面板”。触摸传感器180K可以设置于显示屏194，由触摸传感器180K与显示屏194组成触摸屏，也称“触控屏”。触摸传感器180K用于检测作用于其上或附近的触摸操作。触摸传感器可以将检测到的触摸操作传递给应用处理器，以确定触摸事件类型。可以通过显示屏194提供与触摸操作相关的视觉输出。在另一些实施例中，触摸传感器180K也可以设置于电子设备100的表面，与显示屏194所处的位置不同。
骨传导传感器180M可以获取振动信号。在一些实施例中，骨传导传感器180M可以获取人体声部振动骨块的振动信号。骨传导传感器180M也可以接触人体脉搏，接收血压跳动信号。在一些实施例中，骨传导传感器180M也可以设置于耳机中，结合成骨传导耳机。音频模块170可以基于所述骨传导传感器180M获取的声部振动骨块的振动信号，解析出语音信号，实现语音功能。应用处理器可以基于所述骨传导传感器180M获取的血压跳动信号解析心率信息，实现心率检测功能。
按键190包括开机键，音量键等。按键190可以是机械按键。也可以是触摸式按键。电子设备100可以接收按键输入，产生与电子设备100的用户设置以及功能控制有关的键信号输入。
马达191可以产生振动提示。马达191可以用于来电振动提示，也可以用于触摸振动反馈。例如，作用于不同应用(例如拍照，音频播放等)的触摸操作，可以对应不同的振动反馈效果。作用于显示屏194不同区域的触摸操作，马达191也可对应不同的振动反馈效果。不同的应用场景(例如：时间提醒，接收信息，闹钟，游戏等)也可以对应不同的振动反馈效果。触摸振动反馈效果还可以支持自定义。
指示器192可以是指示灯，可以用于指示充电状态，电量变化，也可以用于指示消息，未接来电，通知等。
SIM卡接口195用于连接SIM卡。SIM卡可以通过插入SIM卡接口195，或从SIM卡接口195拔出，实现和电子设备100的接触和分离。电子设备100可以支持1个或N个SIM卡接口，N为大于1的正整数。SIM卡接口195可以支持Nano SIM卡，Micro SIM卡，SIM卡等。同一个SIM卡接口195可以同时插入多张卡。所述多张卡的类型可以相同，也可以 不同。SIM卡接口195也可以兼容不同类型的SIM卡。SIM卡接口195也可以兼容外部存储卡。电子设备100通过SIM卡和网络交互，实现通话以及数据通信等功能。在一些实施例中，电子设备100采用eSIM，即：嵌入式SIM卡。eSIM卡可以嵌在电子设备100中，不能和电子设备100分离。
电子设备100的软件系统可以采用分层架构，事件驱动架构，微核架构，微服务架构，或云架构。本发明实施例以分层架构的Android系统为例，示例性说明电子设备100的软件结构。
图12是本申请实施例的电子设备100的软件结构框图。
分层架构将软件分成若干个层，每一层都有清晰的角色和分工。层与层之间通过软件接口通信。在一些实施例中，将Android系统分为四层，从上至下分别为应用程序层，应用程序框架层，安卓运行时(Android runtime)和系统库，以及内核层。
应用程序层可以包括一系列应用程序包。
如图12所示，应用程序包可以包括相机，图库，日历，通话，地图，导航，WLAN，蓝牙，音乐，视频，短信息等应用程序。
应用程序框架层为应用程序层的应用程序提供应用编程接口(application programming interface，API)和编程框架。应用程序框架层包括一些预先定义的函数。
如图12所示，应用程序框架层可以包括窗口管理器，内容提供器，视图系统，电话管理器，资源管理器，通知管理器等。
窗口管理器用于管理窗口程序。窗口管理器可以获取显示屏大小，判断是否有状态栏，锁定屏幕，截取屏幕等。
内容提供器用来存放和获取数据，并使这些数据可以被应用程序访问。所述数据可以包括视频，图像，音频，拨打和接听的电话，浏览历史和书签，电话簿等。
视图系统包括可视控件，例如显示文字的控件，显示图片的控件等。视图系统可用于构建应用程序。显示界面可以由一个或多个视图组成的。例如，包括短信通知图标的显示界面，可以包括显示文字的视图以及显示图片的视图。
电话管理器用于提供电子设备100的通信功能。例如通话状态的管理(包括接通，挂断等)。
资源管理器为应用程序提供各种资源，比如本地化字符串，图标，图片，布局文件，视频文件等等。
通知管理器使应用程序可以在状态栏中显示通知信息，可以用于传达告知类型的消息，可以短暂停留后自动消失，无需用户交互。比如通知管理器被用于告知下载完成，消息提醒等。通知管理器还可以是以图表或者滚动条文本形式出现在系统顶部状态栏的通知，例如后台运行的应用程序的通知，还可以是以对话窗口形式出现在屏幕上的通知。例如在状态栏提示文本信息，发出提示音，电子设备振动，指示灯闪烁等。
Android Runtime包括核心库和虚拟机。Android runtime负责安卓系统的调度和管理。
核心库包含两部分：一部分是java语言需要调用的功能函数，另一部分是安卓的核心库。
应用程序层和应用程序框架层运行在虚拟机中。虚拟机将应用程序层和应用程序框架层的java文件执行为二进制文件。虚拟机用于执行对象生命周期的管理，堆栈管理，线程管理，安全和异常的管理，以及垃圾回收等功能。
系统库可以包括多个功能模块。例如：表面管理器(surface manager)，媒体库(Media Libraries)，三维图形处理库(例如：OpenGL ES)，2D图形引擎(例如：SGL)等。
表面管理器用于对显示子系统进行管理，并且为多个应用程序提供了2D和3D图层的融合。
媒体库支持多种常用的音频，视频格式回放和录制，以及静态图像文件等。媒体库可以支持多种音视频编码格式，例如:MPEG4，H.264，MP3，AAC，AMR，JPG，PNG等。
三维图形处理库用于实现三维图形绘图，图像渲染，合成，和图层处理等。
2D图形引擎是2D绘图的绘图引擎。
内核层是硬件和软件之间的层。内核层至少包含显示驱动，摄像头驱动，音频驱动，传感器驱动。
下面结合对焦拍照场景，示例性说明电子设备100软件以及硬件的工作流程。
当摄像头驱动确定需要调整对焦框时，可以驱动相应硬件调整对焦情况。当需要调整对焦框的大小和/或时，摄像头驱动可以驱动对焦马达，对焦马达可以推动镜头到对应的位置。
请参阅图13，图13是本申请实施例提供的一种对焦方法的流程示意图。如图13所示，该对焦方法包含步骤S101～S105。
本申请实施例通过连续几帧对焦框的大小和位置情况判断是否退出第一对焦框，可以提高退出对焦框的条件，从而可以延迟退出对焦框。
S101、电子设备判断是否连续A帧均检测不到目标。如果是，执行步骤S103；否则，执行步骤S102。
其中，目标是预览画面中的对焦对象，例如，目标为人脸。预览画面可以为电子设备拍摄时的预览画面。A为正整数，A的范围可以为3到20，优选地，A为8。
电子设备可以根据目标框的大小和/或位置判断能否检测到目标：
实施方式1：电子设备可以根据判断目标框的大小是否小于第一阈值。如果是，则检测不到目标。
其中，目标框可以是人脸框，也可以是物体框，还可以是动物框等。目标框的大小是对焦的部分的像素值大小。第一阈值的大小为(M*N)，M的范围为10到50，N的范围为10到50，优选地，第一阈值为30*30。例如，当目标框的大小为20*20，第一阈值为30*30时，判断，20小于30，则可以判断目标框不存在于预览画面。
如图5所示，当人离摄像头越来越远时，目标框越来越小，当目标框的大小小于第一阈值30*30时，可以判断检测不到目标。
实施方式2：电子设备可以判断目标框的中心点是否落入预览画面的边缘范围，如果是，则检测不到目标。
图14是本申请实施例示出的一种对焦预览界面的示意图。如图14所示，目标框的中 心点为目标框的几何中心点。预览画面的边缘范围(灰色部分)可以为预览画面中的边缘部分。当目标框的中心点落入预览画面的边缘范围时，可以判断目标框不存在于预览画面。其中，预览画面的边缘范围可以为取景框以内20个像素的部分，也可以是距离取景框其它像素数值的边缘范围，不进行限定。具体还可以参考图6的描述，不加赘述。
需要说明的是，上述判断目标框的大小和/或位置是否满足预设条件可以包括上述实施方式中的一种或两种。当包括两种实施方式时，当且仅当上述两种条件均不满足时，才能判断检测到目标，否则检测不到目标。其两种实施方式的执行顺序不限，可以先确定目标框的大小后确定目标框的位置，也可以先确定目标框的位置后确定目标框的大小。
S102、电子设备获取第一对焦框。
电子设备可以获取第一对焦框，即电子设备可以对目标进行对焦。
应理解，此时电子设备可以对目标进行对焦，所形成的第一对焦框可以显示，也可以不显示，此处不进行限定。
S103、电子设备判断A帧之前的连续B帧是否均检测到目标。如果是，执行步骤S104；否则，执行步骤S105。
其中，B为正整数，B的取值范围可以为1到8，优选地，B为3。例如，A＝8，B＝3时，当8帧预览画面中均检测不到目标，电子设备可以判断将这8帧之前的3帧，如果3帧均检测到目标，执行步骤S104；否则，3帧中至少一帧检测不到目标，执行步骤S102。
S104、电子设备判断A帧之后的连续C帧是否均检测不到目标，如果是，执行步骤S105；否则，执行步骤S102。
其中，C为正整数，C的取值范围可以为1到8，优选地，C为3或5。
图15示出了一组连续多帧预览画面的对焦情况示意图。如图15所示，A为8，B和C均为3，1表示一帧的预览画面中检测到目标，0表示一帧的预览画面中检测不到目标。首先，电子设备可以判断连续A帧是否均为0，若是，进一步判断B帧；否则，执行步骤S102。其中，图15中的连续8帧(a)、(b)、(c)和(d)均为0，(e)A帧中最后两帧为1，因此，(e)获取第一对焦框。其次，电子设备确定连续B帧是否均为1。若是，进一步判断C帧；否则，执行步骤S105。其中，图15中的连续3帧(B帧)(a)和(b)均为1，(c)和(d)不是均为1，因此，(a)和(b)继续判断C帧，(c)和(d)恢复中心对焦框。最后，电子设备确定(a)和(b)连续C帧是否均0，若是，执行步骤S105；否则，执行步骤S102。其中，(a)3帧均为0，(a)恢复中心对焦框；(b)不是3帧均为0，(b)获取第一对焦框。
S105、电子设备恢复中心对焦框。
电子设备可以将第一对焦框移动到中心对焦框，具体描述可以参考上述的图9和图10的描述，不加赘述。
请参阅图16，图16是本申请实施例提供的另一种对焦方法的流程示意图。如图16所示，该对焦方法包含步骤S201～S203。
S201、电子设备判断是否连续A帧均检测不到目标。如果是，执行步骤S202；否则，执行步骤S203。
其中，步骤S201的描述可以参考步骤S101的相关描述，不加赘述。
S202、电子设备获取第一对焦框。
其中，步骤S202的描述可以参考步骤S102的相关描述，不加赘述。
S203、电子设备恢复中心对焦框。
其中，步骤S203的描述可以参考步骤S105的相关描述，不加赘述。
请参阅图17，图17是本申请实施例提供的又一种对焦方法的流程示意图。如图17所示，该对焦方法包含步骤S301～S303。
本申请实施例根据对焦框中人脸姿态角的转动调整对焦框的大小。电子设备根据姿态角的上下转动的人脸姿态角调整第一对焦框的上下高度；和/或，根据姿态角的左右转动的人脸姿态角调整第一对焦框的左右宽度。
S301、电子设备采集人脸姿态角yaw和/或pitch。
当第一对焦框为人脸对焦框时，采集人脸姿态角。人脸姿态角可以包括人头部转动的角度yaw和/或pitch。
图18示出了一种人脸转动时的姿态角示意图。如图18所示，当人竖直站立且人头部正脸正对第一对焦框中时，竖直向下的方向为Y轴，水平方向为X轴方向。人脸姿态角yaw为人的头部上下转动的角度，即人的头部沿着Y轴转动(即人摇头或转头)的角度为yaw的度数。人脸姿态角pitch为人的头部沿着左右转动的角度，人的头部沿着X轴转动的角度(即人点头、低头、仰头或抬头等)为pitch的度数。
电子设备可以通过人脸姿态估计的方法确定yaw和pitch。
示例性地，电子设备可以通过2D(two dimensional)标定信息(即预览画面的2维图像数据)估计3D(three dimensional)姿态信息(3维空间中人脸姿态角)，比如，可以先根据预览画面的图像数据计算人脸的关键点(如眼睛、鼻子、脸部轮廓等)，然后选取参考系(即，预览画面中为人的正脸时的关键点)，计算关键点和参考系的变换矩阵，通过迭代来估计人脸的姿态角yaw和pitch。应理解，确定yaw和pitch也可以为其他方式，不加限定。
S302、当yaw大于第一角度时，缩小第一对焦框高度与宽度的比值；否则，保持第一对焦框高度与宽度的比值。
其中，第一角度可以为预设角度，第一角度的范围为25度到45度，优选地，第一角度为30度，第一对焦框的高度为第一对焦框在竖直方向的长度，第一对焦框的宽度为第一对焦框在水平方向的长度。
当电子设备测量到人低头或仰头达到一定角度时，脸部在预览画面中的竖直方向的长度会缩小，因此可以缩小竖直方向上人脸的对焦框长度。电子设备可以按照一定的比例缩小，也可以按照一定的长度缩小。具体可以参考图8中的(A)和图8中的(B)的描述。
S303、当pitch大于第二角度时，增大第一对焦框高度与宽度的比值；否则，保持第一对焦框高度与宽度的比值。
其中，第二角度也可以为预设角度，第二角度的范围为25度到45度，优选地，第二角度为30度。
当电子设备测量到侧头达到一定角度时，脸部在预览画面中的水平方向的长度会缩小，因此可以缩小水平方向上人脸的对焦框长度。电子设备可以按照一定的比例缩小，也可以按照一定的长度缩小。具体可以参考图8中的(C)和图8中的(D)的描述。
应理解，当人头部沿着Y轴和/或X轴发生偏转时，即人低头、仰头或侧头时，预览画面中的人脸会缩小或者画面中人脸的比例会发生变化。
需要说明的是，本实施例可以包括步骤S302和步骤S303其中的一个，也可以两个均包括。当包括两个时，步骤S302和步骤S303的执行顺序不限，可以先执行步骤S302后执行步骤S303，也可以先执行步骤S303后执行步骤S302。
应理解，根据上述，电子设备的对焦框对准人脸时，可以根据人脸转动的情况对应调整对焦框，让对焦框能够准确地聚焦到人脸的位置，从而可以提高用户体验。
请参阅图19，图19是本申请实施例提供的又一种对焦方法的流程示意图。如图19所示，该对焦方法包含步骤S401～S403。
本实施例可以根据对焦框的当前位置和目标对焦框的位置选择不同的移动对焦框的方式。当对焦框的当前位置和目标对焦框的位置相距较远时，电子设备可多次移动对焦框；否则，可以一次性移动对焦框。
S401、判断目标位置与当前位置差的绝对值是否大于第二阈值。如果是，则执行步骤S402；否则，执行步骤S403。
当预览画面中的对焦框需要移动时，电子设备可以先确定目标位置a和当前位置b，之后可以判断目标位置与当前位置差的绝对值是否大于第二阈值c，即判断|a-b|>c。
其中，当前位置可以为当前对焦框对应的马达位置，目标位置可以为对焦框需要移动到的目标对焦框对应的马达位置。此时，第二阈值可以为15微米，也可以为30微米，不加限定。由于不同的摄像头以及不同的拍摄场景下，在一次性推动马达到准焦位置时，前后预览画面相差较大，用户体验较差。在一些摄像头组件中，马达推动镜头较小的距离，预览界面用户便感知到图像的跳变；在另一些摄像头组件中，马达推动镜头较大的距离，预览界面用户才会感知到图像的跳变，因此需要根据设备组件具体考虑第二阈值的大小。
S402、将对焦框从当前位置多次移动到目标位置。
将对焦框从当前位置多次移动到目标位置，即电子设备多次推动马达，将对焦框的马达位置从当前位置移动多次，至到对焦框的马达位置到达目标位置。具体可以参考图10对应的相关描述。
一种可能的实施方式中，电子设备可以根据目标位置与当前位置、以及第一步长f确定推动马达的次数和每次推动马达的距离。电子设备可以确定推动的次数
Figure PCTCN2022073333-appb-000001
其中，
Figure PCTCN2022073333-appb-000002
为向上取整。既可以理解为，电子设备推动马达的次数目标位置与当前位置之间距离大于第一步长时，电子设备可以先按照第一步长推动马达，当马达位置与目标位置的距离不足第一步长时，直接将马达推动到目标位置。其中，第一步长的范围为5-25微米，优选地，第一步长与第二阈值相等。例如，当a为50微米，b为95微米，第一步长f为15微米时，则d为(95-50)/15＝3，电子设备推动3次马达，每次推动15微米。当a为100 微米，b为155微米，第一步长f为15微米时，则d为
Figure PCTCN2022073333-appb-000003
电子设备推动4次马达，前三次每次推动15微米，最后一次推动(155-100)-3*15＝10微米。
另一种可能的实施方式中，电子设备可以按照电子设备可以根据目标位置a与当前位置b、以及推动马达的次数d确定每次推动马达的距离l。每次推动马达的次数l＝|a-b|/k。此时，电子设备可以推动d次马达，每次推动l微米。例如，当a为50微米，b为95微米，d为15微米时，则l为(95-50)/15＝3，电子设备推动3次马达，每次推动15微米。
需要说明的是，推动马达的次数d应当为有限次数，在用户感知不到对焦框位置跳变的情况下，电子设备可以尽可能的减少推动次数d。
应理解，上述经过多次推动马达，使得预览画面中对焦框的位置分为多次移动，可以使用户不会感知到对焦框跳跃性的位置变化，从而可以提高用户体验。
S403、将对焦框从当前位置一次移动到目标位置。
当电子设备确定目标位置a和当前位置b时，可以直接将马达从当前位置推到目标位置。具体可以参考图9的相关描述，不加赘述。
需要说明的是，上述的目标对焦框可以是中心对焦框，当电子设备的第一对焦框退出时，可以将第一对焦框移动到中心对焦框。上述仅是移动对焦框的一种情形，不加限定。
上述步骤S401～403中，描述了当第一对焦框不满足预设条件时，电子设备退出第一对焦框的过程。例如，退出人脸对焦框到中心对焦框。当人脸对焦框到中心对焦框对应马达位置之间的距离较大时，可以分为多次，逐次移动马达位置；当人脸对焦框到中心对焦框对应马达位置之间的距离较小时，可以一次性调整好马达位置。上述方法可以保证预览画面中的对焦框逐步平滑移动，不会使得人眼感知到对焦框位置的突变，从而可以提高用户体验。
请参阅图20，图20是本申请实施例提供的又一种对焦方法的流程示意图。如图20所示，该对焦方法包含步骤S501～S507。
本申请实施例提供的对焦方法中，首先，可识别根据(第一对焦框)人脸对焦框的大小和/或位置延迟退出人脸对焦。一方面，当退出人脸对焦时，可以根据对焦框的当前的马达位置与中心位置确定选择退出人脸对焦的方式。当对焦框的当前马达位置与中心位置之间的距离大于一定阈值时，分为多次将马达推到中心位置；当对焦框的当前马达位置与中心位置之间的距离不大于上述阈值时，一次性将马达推到中心位置。另一方面，当不退出人脸对焦时，可以根据对焦框人头部的转动情况调整对焦框的大小。
S501、判断是否需要恢复中心对焦框。如果是，执行步骤S502；否则，执行步骤S505。
其中，步骤S501的描述可以参考步骤S101～S105或者S201～S203的相关描述，不加赘述。
S502、判断目标位置与当前位置差的绝对值是否大于第二阈值。如果是，则执行步骤S503；否则，执行步骤S504。
其中，步骤S502的描述可以参考步骤S401的相关描述，不加赘述。
S503、将对焦框从当前位置多次移动到目标位置。
其中，所述目标位置为中心对焦框的位置，步骤S503的描述可以参考步骤S402的相 关描述，不加赘述。
S504、将对焦框从当前位置一次移动到目标位置。
其中，步骤S504的描述可以参考步骤S403的相关描述，不加赘述。
S505、采集人脸姿态角yaw和/或pitch。
其中，步骤S505的描述可以参考步骤S301的相关描述，不加赘述。
S506、当yaw大于第一角度时，缩小第一对焦框高度与宽度的比值；否则，保持第一对焦框高度与宽度的比值。
其中，步骤S506的描述可以参考步骤S302的相关描述，不加赘述。
S507、当pitch大于第二角度时，增大第一对焦框高度与宽度的比值；否则，保持第一对焦框高度与宽度的比值。
其中，步骤S507的描述可以参考步骤S303的相关描述，不加赘述。
在上述实施例中，全部或部分功能可以通过软件、硬件、或者软件加硬件的组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如，固态硬盘(solid state disk，SSD))等。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，该流程可以由计算机程序来指令相关的硬件完成，该程序可存储于计算机可读取存储介质中，该程序在执行时，可包括如上述各方法实施例的流程。而前述的存储介质包括：ROM或随机存储记忆体RAM、磁碟或者光盘等各种可存储程序代码的介质。

Claims (18)

  1. 一种对焦方法，其特征在于，所述方法包括：
    响应于第一操作，电子设备开始拍摄，显示第一界面，所述第一界面显示通过摄像头采集到的预览画面；
    在第一时刻，所述电子设备在所述第一界面显示第K帧预览画面，所述第K帧预览画面是所述摄像头以第一目标的人脸为第一对焦框采集到的；在所述第K帧预览画面中，所述第一目标的人脸符合预设人脸识别条件；
    在第二时刻，所述电子设备在所述第一界面显示第M帧预览画面，所述第M帧预览画面是所述摄像头以所述第一对焦框进行对焦所采集到的；在所述第M帧预览画面中，所述第一目标的人脸不符合所述预设人脸识别条件；所述第二时刻在所述第一时刻之后；所述第M帧预览画面与所述第K帧预览画面之间的帧画面数目小于或等于预设阈值A；所述K、M、A均为正整数。
  2. 根据权利要求1所述的方法，其特征在于，所述预设人脸识别条件包括所述第一目标的人脸框大于第一阈值，和/或，所述人脸框的中心点处于所述预览画面的边缘范围，所述边缘范围为所述预览画面边缘的预定范围。
  3. 根据权利要求1或2所述的方法，其特征在于，所述方法还包括：
    在第三时刻，所述电子设备在所述第一界面显示第W帧预览画面，所述第W帧预览画面是所述摄像头以所述中心对焦框进行对焦所采集到的；在所述第W帧预览画面中，所述第一目标的人脸不符合所述预设人脸识别条件；所述第三时刻在所述第一时刻之后；在所述第W帧预览画面与所述第K帧预览画面之间的预览画面中，所述第一目标的人脸均不符合所述预设人脸识别条件；所述第W帧预览画面与所述第K帧预览画面之间的帧画面数目大于所述预设阈值A；所述W为正整数。
  4. 根据权利要求3所述的方法，其特征在于，所述电子设备在所述第一界面显示第W帧预览画面，具体包括：
    在第三时刻，所述电子设备检测所述第三时刻之前A帧的预览画面；
    在所述连续A帧的预览画面的人脸均不符合所述预设人脸识别的情况下，所述电子设备基于所述中心对焦框确定目标位置，通过马达调整所述摄像头的焦距，通过所述摄像头采集所述第W帧预览画面，所述目标位置为所述中心对焦框的马达位置；
    所述电子设备显示所述第W帧预览画面。
  5. 根据权利要求4所述的方法，其特征在于，所述电子设备基于所述中心对焦框确定目标位置，通过马达调整所述摄像头的焦距，通过所述摄像头采集所述第W预览画面，具体包括：
    当所述目标位置与当前马达位置的距离大于第二阈值时，通过马达调整多次所述摄像 头的焦距，通过所述摄像头采集所述第W预览画面。
  6. 根据权利要求4所述的方法，其特征在于，所述电子设备基于所述中心对焦框确定目标位置，通过马达调整所述摄像头的焦距，通过所述摄像头采集所述第W预览画面，具体包括：
    当所述目标位置与当前马达位置的距离不大于第二阈值时，通过马达调整一次所述摄像头的焦距，通过所述摄像头采集所述第W预览画面。
  7. 根据权利要求1或2所述的方法，其特征在于，所述方法还包括：
    在第四时刻，所述电子设备在所述第一界面显示第S帧预览画面，所述第S帧预览画面是所述摄像头以所述第一对焦框进行对焦所采集到的；在所述第S帧预览画面中，所述第一目标的人脸不符合所述预设人脸识别条件；所述第四时刻在所述第一时刻之后；所述第K帧预览画面之前的连续B帧预览画面均符合所述预设人脸识别条件；在所述第S帧预览画面与所述第K帧预览画面之间的预览画面中，所述第一目标的人脸均不均符合所述预设人脸识别条件；所述第S帧预览画面与所述第K帧预览画面之间的帧画面数目小于或等于预设阈值A+C帧；所述S、B、C均为正整数。
  8. 根据权利要求1或2所述的方法，其特征在于，所述电子设备在所述第一界面显示第K帧预览画面，具体包括：
    在第五时刻，当人脸姿态角yaw大于第一角度时，所述电子设备在所述第一界面显示第K预览画面，所述第K预览画面中第一对焦框的高度与宽度的比值小于上一预览画面中对焦框的高度与宽度的比值，所述人脸姿态角yaw为人的头部上下转动的角度；
    在第六时刻，当人脸姿态角pitch大于第二角度时，所述电子设备在所述第一界面显示第K预览画面，所述第K预览画面中第一对焦框的高度与宽度的比值大于上一预览画面中对焦框的高度与宽度的比值，所述人脸姿态角pitch为人的头部沿着左右转动的角度。
  9. 一种电子设备，其特征在于，包括：触控屏、摄像头、一个或多个处理器和一个或多个存储器，所述一个或多个存储器用于存储计算机程序代码，计算机程序代码包括计算机指令，当所述一个或多个处理器执行所述计算机指令时，以使得所述电子设备执行：
    响应于第一操作，开始拍摄，显示第一界面，所述第一界面显示通过摄像头采集到的预览画面；
    在第一时刻，在所述第一界面显示第K帧预览画面，所述第K帧预览画面是所述摄像头以第一目标的人脸为第一对焦框采集到的；在所述第K帧预览画面中，所述第一目标的人脸符合预设人脸识别条件；
    在第二时刻，在所述第一界面显示第M帧预览画面，所述第M帧预览画面是所述摄像头以所述第一对焦框进行对焦所采集到的；在所述第M帧预览画面中，所述第一目标的人脸不符合所述预设人脸识别条件；所述第二时刻在所述第一时刻之后；所述第M帧预览画面与所述第K帧预览画面之间的帧画面数目小于或等于预设阈值A；所述K、M、A均 为正整数。
  10. 根据权利要求9所述的电子设备，其特征在于，所述预设人脸识别条件包括所述第一目标的人脸框大于第一阈值，和/或，所述人脸框的中心点处于所述预览画面的边缘范围，所述边缘范围为所述预览画面边缘的预定范围。
  11. 根据权利要求9或10所述的电子设备，其特征在于，所述电子设备还执行：
    在第三时刻，在所述第一界面显示第W帧预览画面，所述第W帧预览画面是所述摄像头以所述中心对焦框进行对焦所采集到的；在所述第W帧预览画面中，所述第一目标的人脸不符合所述预设人脸识别条件；所述第三时刻在所述第一时刻之后；在所述第W帧预览画面与所述第K帧预览画面之间的预览画面中，所述第一目标的人脸均不符合所述预设人脸识别条件；所述第W帧预览画面与所述第K帧预览画面之间的帧画面数目大于所述预设阈值A；所述W为正整数。
  12. 根据权利要求11所述的电子设备，其特征在于，所述电子设备在所述第一界面显示第W帧预览画面，具体执行：
    在第三时刻，检测所述第三时刻之前A帧的预览画面；
    在所述连续A帧的预览画面的人脸均不符合所述预设人脸识别的情况下，基于所述中心对焦框确定目标位置，通过马达调整所述摄像头的焦距，通过所述摄像头采集所述第W帧预览画面，所述目标位置为所述中心对焦框的马达位置；
    显示所述第W帧预览画面。
  13. 根据权利要求12所述的电子设备，其特征在于，所述电子设备基于所述中心对焦框确定目标位置，通过马达调整所述摄像头的焦距，通过所述摄像头采集所述第W预览画面，具体执行：
    当所述目标位置与当前马达位置的距离大于第二阈值时，通过马达调整多次所述摄像头的焦距，通过所述摄像头采集所述第W预览画面。
  14. 根据权利要求12所述的电子设备，其特征在于，所述电子设备基于所述中心对焦框确定目标位置，通过马达调整所述摄像头的焦距，通过所述摄像头采集所述第W预览画面，具体执行：
    当所述目标位置与当前马达位置的距离不大于第二阈值时，通过马达调整一次所述摄像头的焦距，通过所述摄像头采集所述第W预览画面。
  15. 根据权利要求9或10所述的电子设备，其特征在于，所述电子设备还执行：
    在第四时刻，在所述第一界面显示第S帧预览画面，所述第S帧预览画面是所述摄像头以所述第一对焦框进行对焦所采集到的；在所述第S帧预览画面中，所述第一目标的人脸不符合所述预设人脸识别条件；所述第四时刻在所述第一时刻之后；所述第K帧预览画 面之前的连续B帧预览画面均符合所述预设人脸识别条件；在所述第S帧预览画面与所述第K帧预览画面之间的预览画面中，所述第一目标的人脸均不均符合所述预设人脸识别条件；所述第S帧预览画面与所述第K帧预览画面之间的帧画面数目小于或等于预设阈值A+C帧；所述S、B、C均为正整数。
  16. 根据权利要求9或10所述的电子设备，其特征在于，所述电子设备在所述第一界面显示第K帧预览画面，具体执行：
    在第五时刻，当人脸姿态角yaw大于第一角度时，在所述第一界面显示第K预览画面，所述第K预览画面中第一对焦框的高度与宽度的比值小于上一预览画面中对焦框的高度与宽度的比值，所述人脸姿态角yaw为人的头部上下转动的角度；
    在第六时刻，当人脸姿态角pitch大于第二角度时，在所述第一界面显示第K预览画面，所述第K预览画面中第一对焦框的高度与宽度的比值大于上一预览画面中对焦框的高度与宽度的比值，所述人脸姿态角pitch为人的头部沿着左右转动的角度。
  17. 一种计算机可读存储介质，包括指令，其特征在于，当所述指令在电子设备上运行时，使得所述电子设备执行如权利要求1-8中任一项所述的方法。
  18. 一种计算机程序产品，其特征在于，当所述计算机程序产品在计算机上运行时，使得所述计算机执行如权利要求1-8中任一项所述的方法。
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