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WO2018228467A1 - Procédé et dispositif d'exposition d'image, dispositif photographique, et support de stockage - Google Patents

Procédé et dispositif d'exposition d'image, dispositif photographique, et support de stockage Download PDF

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Publication number
WO2018228467A1
WO2018228467A1 PCT/CN2018/091228 CN2018091228W WO2018228467A1 WO 2018228467 A1 WO2018228467 A1 WO 2018228467A1 CN 2018091228 W CN2018091228 W CN 2018091228W WO 2018228467 A1 WO2018228467 A1 WO 2018228467A1
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WIPO (PCT)
Prior art keywords
image
exposure
portrait
shooting scene
current shooting
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Ceased
Application number
PCT/CN2018/091228
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English (en)
Chinese (zh)
Inventor
曾元清
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Publication date
Application filed by Guangdong Oppo Mobile Telecommunications Corp Ltd filed Critical Guangdong Oppo Mobile Telecommunications Corp Ltd
Publication of WO2018228467A1 publication Critical patent/WO2018228467A1/fr
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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
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H04N23/71—Circuitry for evaluating the brightness variation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H04N23/76—Circuitry for compensating brightness variation in the scene by influencing the image signals

Definitions

  • the present application relates to the field of image processing technologies, and in particular, to an image exposure method, apparatus, imaging apparatus, and storage medium.
  • Controlling the camera to perform proper exposure with appropriate exposure compensation is an essential condition for obtaining a high quality image during image capture or framing display.
  • Most current camera devices (such as mobile terminals) support manual adjustment of exposure. Manual adjustment of exposure can be accomplished by the user clicking the set button to trigger the camera to display the exposure bar on the screen, and the user slides the cursor in the exposure bar.
  • the exposure compensation at the time of image shooting can be set to achieve the purpose of adjusting the exposure effect.
  • an image capturing device (such as a mobile terminal) performs the same exposure compensation process on the entire image when performing image exposure processing on the image, that is, if the user wants to adjust the exposure effect of an area in the image, the image is in the image. Other areas will also be adjusted to the same exposure. It can be seen that the existing manual adjustment exposure scheme cannot comprehensively consider the exposure effect of a specific area in the image, so that appropriate exposure compensation cannot be obtained, and thus a high-quality exposure image cannot be obtained, and the user experience is deteriorated.
  • the purpose of the present application is to solve at least one of the above technical problems to some extent.
  • the first object of the present application is to propose an image exposure method.
  • the method can realize the purpose of auto-exposure based on multi-frame fusion, comprehensively considers the exposure effect of each specific region in the captured image, so that the entire shot is properly compensated, thereby obtaining a high-quality exposure image and improving the user.
  • the method can realize the purpose of auto-exposure based on multi-frame fusion, comprehensively considers the exposure effect of each specific region in the captured image, so that the entire shot is properly compensated, thereby obtaining a high-quality exposure image and improving the user.
  • a second object of the present application is to provide an image exposure apparatus.
  • a third object of the present application is to propose an image pickup apparatus.
  • a fourth object of the present application is to propose a storage medium.
  • the image exposure method of the first aspect of the present application includes: when detecting a portrait in the current shooting scene, extracting a silhouette of the current shooting scene based on the depth information of the current shooting scene. And a background portion; acquiring a face region of the portrait, and locating the body region of the portrait according to the face region and the silhouette of the portrait; detecting the face region, the body region, and the background portion, respectively Brightness to obtain corresponding first photometric value, second photometric value and third photometric value; respectively according to the first photometric value, the second photometric value and the third photometric value Exposing and photographing the face area, the body area, and the background portion to obtain corresponding first exposure image, second exposure image, and third exposure image; for the first exposure image, The two exposure images and the third exposure image are subjected to fusion processing to obtain a fused target image.
  • the portrait contour and the background portion in the current shooting scene may be extracted based on the depth information of the current shooting scene, and the human face region and the body are respectively detected.
  • the brightness of the area and the background portion is obtained to obtain corresponding first photometric values, second photometric values, and third photometric values, and are respectively performed according to the first photometric value, the second photometric value, and the third photometric value, respectively.
  • Exposure control and shooting to obtain the corresponding three images.
  • the three differently exposed images are fused, and the resulting face, portrait outline, and background part are all exposed to appropriate photos, which realizes multi-frame fusion.
  • the purpose of auto-exposure is to take into account the exposure effect of each specific area in the captured image, so that the entire shot is properly compensated, and the high-quality exposure image can be obtained, which improves the user experience.
  • an image exposure apparatus includes: a first acquisition module, configured to acquire depth information of a current shooting scene; and an extraction module, configured to include, in detecting the current shooting scene And a second image acquisition module for acquiring a face contour and a background portion in the current shooting scene; a second acquiring module, configured to acquire a face region of the portrait; a positioning module, configured to use the face region and Positioning the body area of the portrait; the detecting module is configured to respectively detect brightness of the face area, the body area and the background part to obtain a corresponding first photometric value and a second measurement a light value and a third light metering value; a control module, configured to face the human face region and the body region according to the first light metering value, the second light metering value, and the third light metering value, respectively Performing exposure control and photographing with the background portion to obtain corresponding first exposure image, second exposure image, and third exposure image; and a fusion module for using
  • the portrait contour and the background portion in the current shooting scene may be extracted based on the depth information of the current shooting scene
  • the detecting module respectively detects The brightness of the face area, the body area, and the background portion to obtain corresponding first photometric values, second photometric values, and third photometric values
  • the control module respectively according to the first photometric value, the second photometric value, and
  • the third photometric value is subjected to exposure control and photographing to obtain corresponding three images
  • the fusion module performs fusion processing on the three differently exposed images to obtain a photograph of the final generated face, the silhouette of the portrait, and the background portion.
  • an image pickup apparatus includes a memory, a processor, and a computer program stored on the memory and operable on the processor, and the processor implements the program when the program is executed.
  • the image exposure method described in the first aspect of the invention is applied.
  • a non-transitory computer readable storage medium has a computer program stored thereon, and when the program is executed by the processor, the image exposure described in the first aspect of the present application is implemented. method.
  • FIG. 1 is a flow chart of an image exposure method according to an embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of an image exposure apparatus according to an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of an image exposure apparatus according to an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of an image pickup apparatus according to an embodiment of the present application.
  • the camera device may be a device having a photographing function, for example, a mobile terminal (such as a mobile phone, a tablet computer, and the like having various operating systems), a digital camera, and the like.
  • the image exposure method may include:
  • the portrait contour and the background portion in the current shooting scene are extracted based on the depth information of the current shooting scene.
  • the depth information of the current shooting scene may be acquired first.
  • the depth of field refers to the distance between the front and back of the object measured by the image that can obtain a clear image at the front of the camera lens or other imager. After the focus is completed, a clear image can be formed in the range before and after the focus. This range of distances before and after is called depth of field.
  • the length of the space in which the subject is located is called the depth of field. In other words, the image in the space in which the image is blurred on the surface of the film is within the limited range of the allowable circle, and the length of the space is the depth of field.
  • the step of acquiring the depth of field information and the step of detecting whether the current shooting scene includes a portrait may not be specifically limited: as an example, the current shooting scene may be acquired first. Depth of field information, after that, face recognition technology can be used to detect whether a portrait is included in the current shooting scene. As another example, the face recognition technology may be used to detect whether a portrait is included in the current shooting scene, and when the portrait is included in the current shooting scene, the depth information of the current shooting scene is acquired.
  • the depth information of the current shooting scene may be acquired by a dual camera or a depth RGBD (RGB+depth, color depth image including color information and distance depth information) camera.
  • a dual camera the specific implementation process of acquiring the depth information of the current shooting scene by using the dual camera may be as follows: the first angle ⁇ 1 of the object to be photographed and the left camera may be calculated by an algorithm, and the object to be photographed and the right camera are calculated.
  • the second angle ⁇ 2 such that the center distance between the left camera and the right camera (where the center distance is a fixed value), the first angle ⁇ 1 and the second angle ⁇ 2, can be calculated by using the triangle principle
  • the distance between the object and the lens which is the depth of field information of the current shooting scene.
  • the specific implementation process of acquiring the depth information of the current shooting scene by the depth RGBD camera may be as follows: using the depth detector (for example, an infrared sensor, etc.) in the depth RGBD camera, the detection is taken. The distance between the object and the camera, which is the depth of field information of the current shooting scene.
  • the depth detector for example, an infrared sensor, etc.
  • the face detection technology When detecting the portrait image in the current shooting scene and obtaining the depth information of the current shooting scene, the face detection technology is used to calculate the distance between the face and the lens according to the depth information of the current shooting scene, and the distance is searched according to the distance.
  • the distance finds the entire silhouette of the portrait and extracts the background portion from the current shooting scene based on the distance difference separation technique and the portrait contour.
  • the above formula (1) can be expressed as follows:
  • ⁇ L is the depth of field information of the current shooting scene
  • f is the focal length of the lens
  • F is the aperture value at the time of lens shooting
  • ⁇ is the diameter of the circle of confusion
  • L is the distance between the face and the lens.
  • a face region of the portrait is acquired, and the body region of the portrait is located according to the face region and the silhouette of the portrait.
  • the face recognition technology may be used to acquire the face region of the portrait, such as the location and size information of the face region, and then, according to the face region and the silhouette of the portrait. (ie the overall outline of the portrait), the body area of the portrait can be determined. That is to say, the body area of the portrait is the remaining part of the portrait outline after the face area is removed.
  • Block 130 detecting brightness of the face area, the body area, and the background portion, respectively, to obtain corresponding first photometric values, second photometric values, and third photometric values.
  • the brightness value of the face region can be detected to obtain a corresponding first photometric value, and the brightness value of the body region is detected to obtain a corresponding second photometric value, and the brightness of the background portion is detected. Value to get the corresponding third metering value.
  • a brightness value of each pixel in the face region may be detected, and brightness values of the respective pixels are averaged, and the average value is used as the whole person.
  • the brightness value of the face area, and the brightness value of the entire face area is used as the first light metering value of the face area.
  • Block 140 performing exposure control and photographing on the face region, the body region, and the background portion according to the first photometric value, the second photometric value, and the third photometric value, respectively, to obtain a corresponding first exposure image, second Exposure image and third exposure image.
  • the face region may be subjected to exposure control and shooting according to the first photometric value to obtain a first exposure image for the face region, and the body region of the portrait is performed according to the second photometric value.
  • a fusion process is performed on the first exposure image, the second exposure image, and the third exposure image to obtain a fused target image.
  • the face region in the first exposure image, the body region in the second exposure image, and the background portion in the third exposure image may be spliced, and a smoothing filter is adopted. , the boundary at the seam is eliminated to obtain the fused target image.
  • the final generated face, portrait outline, and background portion are all exposed to appropriate photos.
  • the purpose of auto-exposure based on multi-frame fusion is realized.
  • the portrait contour and the background portion in the current shooting scene may be extracted based on the depth information of the current shooting scene, and the human face region and the body are respectively detected.
  • the brightness of the area and the background portion is obtained to obtain corresponding first photometric values, second photometric values, and third photometric values, and are respectively performed according to the first photometric value, the second photometric value, and the third photometric value, respectively.
  • Exposure control and shooting to obtain the corresponding three images.
  • the three differently exposed images are fused, and the resulting face, portrait outline, and background part are all exposed to appropriate photos, which realizes multi-frame fusion.
  • the purpose of auto-exposure is to take into account the exposure effect of each specific area in the captured image, so that the entire shot is properly compensated, and the high-quality exposure image can be obtained, which improves the user experience.
  • an embodiment of the present application further provides an image exposure apparatus, and the image exposure apparatus provided by the embodiments of the present application and the image exposure method provided by the above embodiments
  • the embodiment of the image exposure method described above is also applicable to the image exposure apparatus provided in this embodiment, which will not be described in detail in this embodiment.
  • 2 is a schematic structural view of an image exposure apparatus according to an embodiment of the present application.
  • the image exposing device may include: a first acquiring module 210 , an extracting module 220 , a second acquiring module 230 , a positioning module 240 , a detecting module 250 , a control module 260 , and a fusion module 270 .
  • the first acquiring module 210 is configured to acquire depth information of the current shooting scene. Specifically, in an embodiment of the present application, the first acquiring module 210 may acquire the depth information of the current shooting scene through a dual camera or a deep RGBD camera.
  • the extracting module 220 is configured to extract a portrait contour and a background portion in the current shooting scene based on the depth information when detecting the portrait in the current shooting scene.
  • the extraction module 220 may include: a calculation unit 221 and an extraction unit 222.
  • the calculation unit 221 is configured to calculate the distance between the face and the lens according to the depth information of the current shooting scene by using a face detection technology.
  • the extracting unit 222 is configured to find a portrait contour according to the distance, and extract a background portion from the current photographing scene according to the distance difference separating technique and the portrait contour.
  • the second obtaining module 230 is configured to acquire a face area of the portrait.
  • the positioning module 240 is configured to locate a body region of the portrait according to the face region and the silhouette of the portrait.
  • the detecting module 250 is configured to respectively detect brightness of the face area, the body area, and the background portion to obtain corresponding first photometric values, second photometric values, and third photometric values.
  • the control module 260 is configured to perform exposure control on the face region, the body region, and the background portion according to the first photometric value, the second photometric value, and the third photometric value, respectively. Shooting to obtain corresponding first exposure image, second exposure image, and third exposure image.
  • the fusion module 270 is configured to perform fusion processing on the first exposure image, the second exposure image, and the third exposure image to obtain a fused target image. Specifically, in an embodiment of the present application, the fusion module 270 may perform splicing processing on the face region in the first exposure image, the body region in the second exposure image, and the background portion in the third exposure image, A smoothing filter is used to eliminate the boundaries at the seam to obtain a fused target image.
  • the portrait contour and the background portion in the current shooting scene may be extracted based on the depth information of the current shooting scene
  • the detecting module respectively detects The brightness of the face area, the body area, and the background portion to obtain corresponding first photometric values, second photometric values, and third photometric values
  • the control module respectively according to the first photometric value, the second photometric value, and
  • the third photometric value is subjected to exposure control and photographing to obtain corresponding three images
  • the fusion module performs fusion processing on the three differently exposed images to obtain a photograph of the final generated face, the silhouette of the portrait, and the background portion.
  • the present application also proposes an imaging apparatus.
  • FIG. 4 is a schematic structural diagram of an image pickup apparatus according to an embodiment of the present application.
  • the imaging device may be a device having a shooting function, for example, a mobile terminal (such as a mobile phone, a tablet computer, or the like having various operating systems), a digital camera, or the like.
  • the image pickup apparatus 40 may include a memory 41, a processor 42, and a computer program 43 stored on the memory 41 and operable on the processor 42, and when the processor 42 executes the computer program 43, The image exposure method described in any of the above embodiments is applied.
  • the present application further provides a non-transitory computer readable storage medium having stored thereon a computer program, which is executed by the processor to implement the image exposure method described in any of the above embodiments of the present application. .
  • the present application also provides a computer program product that, when executed by a processor, performs an image exposure method, the method comprising the steps of:
  • the portrait contour and the background portion in the current shooting scene are extracted based on the depth information of the current shooting scene.
  • the face area of the portrait is acquired, and the body area of the portrait is located according to the face area and the silhouette of the portrait.
  • the first exposure image, the second exposure image, and the third exposure image are subjected to fusion processing to obtain a fused target image.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” or “second” may include at least one of the features, either explicitly or implicitly.
  • the meaning of "a plurality” is at least two, such as two, three, etc., unless specifically defined otherwise.
  • a "computer-readable medium” can be any apparatus that can contain, store, communicate, propagate, or transport a program for use in an instruction execution system, apparatus, or device, or in conjunction with the instruction execution system, apparatus, or device.
  • computer readable media include the following: electrical connections (electronic devices) having one or more wires, portable computer disk cartridges (magnetic devices), random access memory (RAM), Read only memory (ROM), erasable editable read only memory (EPROM or flash memory), fiber optic devices, and portable compact disk read only memory (CDROM).
  • the computer readable medium may even be a paper or other suitable medium on which the program can be printed, as it may be optically scanned, for example by paper or other medium, followed by editing, interpretation or, if appropriate, other suitable The method is processed to obtain the program electronically and then stored in computer memory.
  • portions of the application can be implemented in hardware, software, firmware, or a combination thereof.
  • multiple steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system.
  • a suitable instruction execution system For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or combination of the following techniques well known in the art: having logic gates for implementing logic functions on data signals. Discrete logic circuits, application specific integrated circuits with suitable combinational logic gates, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.
  • each functional unit in each embodiment of the present application may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module.
  • the above integrated modules can be implemented in the form of hardware or in the form of software functional modules.
  • the integrated modules, if implemented in the form of software functional modules and sold or used as stand-alone products, may also be stored in a computer readable storage medium.
  • the above mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like. While the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the present application. The embodiments are subject to variations, modifications, substitutions and variations.

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Abstract

La présente invention concerne un procédé et un dispositif d'exposition d'image, un dispositif photographique, et un support de stockage. Le procédé consiste à : lorsqu'il est détecté qu'une figure humaine est contenue dans une scène photographique actuelle, extraire un contour de figure humaine et une partie d'arrière-plan dans la scène photographique actuelle sur la base d'informations de profondeur de champ relatives à la scène photographique actuelle; acquérir une zone de visage humain de la figure humaine, et positionner une zone de corps de la figure humaine d'après la zone de visage humain et le contour de la figure humaine; détecter respectivement la luminosité de la zone de visage humain, de la zone de corps et de la partie d'arrière-plan afin d'obtenir une première valeur de lumière, une deuxième valeur de lumière, et une troisième valeur de lumière correspondantes; exécuter respectivement un contrôle d'exposition et une photographie d'après la première valeur de lumière, la deuxième valeur de lumière, et la troisième valeur de lumière afin d'obtenir une première image exposée, une deuxième image exposée, et une troisième image exposée correspondantes; et fusionner les trois images exposées différemment afin d'obtenir une image cible fusionnée. Le procédé selon l'invention permet d'obtenir une compensation d'exposition appropriée pour la photographie tout entière, ainsi qu'une image exposée de haute qualité.
PCT/CN2018/091228 2017-06-16 2018-06-14 Procédé et dispositif d'exposition d'image, dispositif photographique, et support de stockage Ceased WO2018228467A1 (fr)

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