WO2017133075A1 - Procédé et appareil de détermination de différence de phase - Google Patents

Procédé et appareil de détermination de différence de phase Download PDF

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Publication number
WO2017133075A1
WO2017133075A1 PCT/CN2016/078979 CN2016078979W WO2017133075A1 WO 2017133075 A1 WO2017133075 A1 WO 2017133075A1 CN 2016078979 W CN2016078979 W CN 2016078979W WO 2017133075 A1 WO2017133075 A1 WO 2017133075A1
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WO
WIPO (PCT)
Prior art keywords
image
pixel
camera
intensity distribution
light intensity
Prior art date
Application number
PCT/CN2016/078979
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English (en)
Chinese (zh)
Inventor
潘林凯
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中兴通讯股份有限公司
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Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2017133075A1 publication Critical patent/WO2017133075A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/70—SSIS architectures; Circuits associated therewith
    • H04N25/703—SSIS architectures incorporating pixels for producing signals other than image signals
    • H04N25/704—Pixels specially adapted for focusing, e.g. phase difference pixel sets
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/10—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths
    • 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
    • H04N23/672—Focus control based on electronic image sensor signals based on the phase difference signals
    • 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
    • H04N23/683—Vibration or motion blur correction performed by a processor, e.g. controlling the readout of an image memory
    • 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

Definitions

  • the present application relates to the field of imaging, for example, to a method and apparatus for determining a phase difference.
  • phase information of the image is obtained by sacrificing some pixels in the image sensor, or the image phase can be obtained by additionally adding a camera to form a dual camera.
  • Information that is, phase detection (PD), to assist in the focus of the camera.
  • PD phase detection
  • the embodiment of the invention provides a method and a device for determining a phase difference, so as to solve at least the problem that the camera needs to sacrifice the original pixels of the image sensor or need to additionally increase the camera when acquiring the phase information of the image in the related art.
  • An embodiment of the present invention provides a method for determining a phase difference, comprising: acquiring a first image captured by a camera at a first location, and acquiring a second image captured by the camera at a second location; The first pixel information and the second pixel information of the second image determine a phase difference between the first image and the second image.
  • the acquiring the first image captured by the camera at the first location, and acquiring the second image captured by the camera at the second location comprises: acquiring the camera at the first position after the camera is activated a first image; driving the camera to move a specified distance in a predetermined direction to reach a second a position, wherein the specified distance is an integer multiple of a distance occupied by the unit pixel in the preset direction; after driving the camera to move a specified distance in a preset direction to reach the second position, acquiring the camera in the The second image taken at the second position.
  • the preset direction is a horizontal direction or a vertical direction.
  • determining, according to the first pixel information of the first image and the second pixel information of the second image, determining a phase difference between the first image and the second image comprises: separately calculating a first pixel light intensity distribution curve of the first image and a second pixel light intensity distribution curve of the second image, wherein a position of the first pixel in the first image and the second pixel are Corresponding to positions in the second image;
  • a peak difference between the first pixel light intensity distribution curve and the second pixel light intensity distribution curve is determined as the phase difference.
  • determining the peak difference between the first pixel light intensity distribution curve and the second pixel light intensity distribution curve as the phase difference comprises: calculating a peak pixel of the first pixel light intensity distribution curve And a position difference of a peak pixel of the second pixel light intensity distribution curve; and multiplying the position difference by a size of the unit pixel in a vertical direction to obtain the phase difference.
  • the first pixel light intensity distribution curve includes: a pixel light intensity distribution curve of one or more columns of pixels along a first predetermined starting position of the first image; and the second pixel light intensity distribution The curve includes a pixel intensity distribution curve of one or more columns of pixels along a second predetermined starting position of the second image.
  • the embodiment of the present invention further provides a phase difference determining apparatus, including: an acquiring module, configured to acquire a first image captured by the camera at the first position, and acquire a second image captured by the camera at the second position; And a module configured to determine a phase difference between the first image and the second image according to the first pixel information of the first image and the second pixel information of the second image.
  • a phase difference determining apparatus including: an acquiring module, configured to acquire a first image captured by the camera at the first position, and acquire a second image captured by the camera at the second position; And a module configured to determine a phase difference between the first image and the second image according to the first pixel information of the first image and the second pixel information of the second image.
  • the acquiring module includes: a first acquiring unit, configured to acquire a first image captured by the camera at the first position after the camera is started; and a driving unit configured to drive the camera along the preset Moving the specified distance to the second position, wherein the specified distance is an integer multiple of the distance occupied by the unit pixel in the preset direction; and the second obtaining unit is configured to be driven by the driving unit After the camera moves a predetermined distance in the preset direction to reach the second position, the second image captured by the camera at the second position is acquired.
  • the preset direction is a horizontal direction or a vertical direction.
  • the determining module includes: a calculating unit configured to separately calculate a first pixel light intensity distribution curve of the first image and a second pixel light intensity distribution curve of the second image, wherein the a position of a pixel in the first image and a position of the second pixel in the second image; a determining unit configured to set the first pixel light intensity distribution curve and the second pixel light The peak difference of the strong distribution curve is determined as the phase difference.
  • the determining unit includes: a calculating subunit, configured to calculate a position difference between a peak pixel of the first pixel light intensity distribution curve and a peak pixel of the second pixel light intensity distribution curve; determining a subunit, It is set to multiply the position difference and the size of the unit pixel in the vertical direction to obtain the phase difference.
  • the first pixel light intensity distribution curve includes: a pixel light intensity distribution curve of one or more columns of pixels along a first predetermined starting position of the first image; and the second pixel light intensity distribution The curve includes a pixel intensity distribution curve of one or more columns of pixels along a second predetermined starting position of the second image.
  • the embodiment of the invention further provides a computer readable storage medium storing computer executable instructions for performing the above method.
  • Embodiments of the present invention also provide an apparatus including one or more processors, a memory, and one or more programs, the one or more programs being stored in a memory when executed by one or more processors , perform the above method.
  • the first image captured by the camera at the first position is acquired, and the second image captured by the camera at the second position is acquired; according to the first pixel information of the first image and the The second pixel information of the second image determines a phase difference between the first image and the second image, acquires a pair of images at different positions by one camera, and then obtains phase difference information by comparing the two images without It is necessary to sacrifice the pixels of the camera's original image sensor, and does not need to use other additional cameras.
  • the camera needs to sacrifice image sensing when acquiring phase information.
  • the original pixel of the device or the need to add additional camera problems the camera can achieve phase focusing, but also to ensure the image quality, without the need to add additional camera effects.
  • FIG. 1 is a flow chart of a method of determining a phase difference according to an embodiment of the present invention
  • FIG. 2 is a block diagram showing the structure of a phase difference determining apparatus according to an embodiment of the present invention
  • FIG. 3 is a block diagram showing an optional structure of a phase difference determining apparatus according to an embodiment of the present invention.
  • FIG. 4 is a block diagram 2 of an optional structure of a phase difference determining apparatus according to an embodiment of the present invention.
  • FIG. 5 is a block diagram 3 of an optional structure of a phase difference determining apparatus according to an embodiment of the present invention.
  • FIG. 6 is a block diagram showing the structure of an apparatus in accordance with an alternative embodiment of the present invention.
  • FIG. 7 is a schematic diagram of camera movement according to an alternative embodiment of the present invention.
  • FIG. 8 is a schematic diagram of pixel distribution of an image taken by a avatar head according to an alternative embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of hardware of a device according to an embodiment of the present invention.
  • FIG. 1 is a flowchart of a method for determining a phase difference according to an embodiment of the present invention. As shown in FIG. 1, the process includes the following steps:
  • Step S102 acquiring a first image captured by the camera at the first position, and acquiring a second image captured by the camera at the second position;
  • the first image and the second image are respectively captured at different positions.
  • the first image and the second image may be separately labeled and saved in pairs.
  • Step S104 determining a phase difference between the first image and the second image according to the first pixel information of the first image and the second pixel information of the second image.
  • the technical solution of the embodiment is: acquiring a first image captured by the camera at the first position, and acquiring a second image captured by the camera at the second position; according to the first pixel information of the first image and the second pixel of the second image The information determines the phase difference between the first image and the second image, obtains a pair of images at different positions by one camera, and then compares the two image phase difference information without sacrificing the pixels of the original image sensor of the camera.
  • acquiring the first image captured by the camera at the first location, and acquiring the second image captured by the camera at the second location includes:
  • the driving camera moves the specified distance in the preset direction to reach the second position, wherein the specified distance is an integer multiple of the distance occupied by the unit pixel in the preset direction;
  • the camera may be driven by a driving motor connected to the camera, wherein the driving direction, that is, the preset direction, may be a horizontal direction or a vertical direction.
  • the horizontal direction or the vertical direction The x-direction and the y-direction respectively drive the motor to drive the camera to move
  • the distance length, that is, the specified distance of movement is an integral multiple of the distance occupied by the unit pixel in the driving direction. If the camera moves in the x direction and the distance of the unit pixel in the x direction is A, the position of the camera in the x direction after the movement is: the first position + NA, where N is an integer greater than 0.
  • determining, according to the first pixel information of the first image and the second pixel information of the second image, a phase difference between the first image and the second image includes:
  • the first pixel light intensity distribution curve includes: a pixel light intensity distribution curve of one or more columns of pixels along a first predetermined starting position of the first image; and the second pixel light intensity distribution curve includes: along the second A pixel intensity distribution curve of one or more columns of pixels starting from a second predetermined starting position of the image.
  • the driving horizontal motor moves the second image by moving the distance of two pixels in the +x direction, calculating the first column of pixel light intensity values of the first image along the y direction and the third column of the second image along the y direction a pixel light intensity value
  • the first column of pixels of the first image and the third column of pixels of the second image are in the first image
  • Corresponding to the position in the second image may be the first column of pixels on the left side of the image, and the phase difference information may be calculated by comparing the two, and the second image of the first image may be correspondingly calculated in sequence.
  • the phase difference information of the third, fourth, and sixth columns of the third, fourth, and second images can finally obtain the phase difference information of the entire image of the two images.
  • determining the peak difference between the first pixel intensity distribution curve and the second pixel intensity distribution curve as the phase difference can be implemented by the following steps, including:
  • the storage medium includes a plurality of instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the methods of various embodiments of the present application.
  • a terminal device which may be a mobile phone, a computer, a server, or a network device, etc.
  • a phase difference determining device is also provided.
  • the device may be disposed in the camera or may be coupled to other camera devices that can take pictures.
  • the device can implement the above embodiments and optional embodiments, and the descriptions thereof have been omitted.
  • the term "module" may implement a combination of software and/or hardware of a predetermined function.
  • FIG. 2 is a structural block diagram of a phase difference determining apparatus according to an embodiment of the present invention. As shown in FIG. 2, the apparatus includes:
  • the acquiring module 20 is configured to acquire a first image captured by the camera at the first position, and acquire a second image captured by the camera at the second position;
  • the determining module 22 is configured to determine a phase difference between the first image and the second image according to the first pixel information of the first image and the second pixel information of the second image.
  • FIG. 3 is a block diagram of an optional structure of a phase difference determining apparatus according to an embodiment of the present invention.
  • the acquiring module 20 may further include:
  • the first obtaining unit 30 is configured to acquire a first image captured by the camera at the first position after the camera is started;
  • the driving unit 32 is configured to drive the camera to move the specified distance in the preset direction to reach the second position, wherein the specified distance is an integer multiple of the distance occupied by the unit pixel in the preset direction;
  • the second obtaining unit 34 is configured to obtain a second image captured by the camera at the second position after the driving unit drives the camera to move the specified distance in the preset direction to reach the second position.
  • the determining module may further include:
  • the calculating unit 40 is configured to respectively calculate a first pixel light intensity distribution curve of the first image and a second pixel light intensity distribution curve of the second image, wherein the position of the first pixel in the first image and the second pixel are in the The position in the two images corresponds;
  • the determining unit 42 is configured to determine a peak difference between the first pixel light intensity distribution curve and the second pixel light intensity distribution curve as a phase difference.
  • the first pixel intensity distribution curve includes: a pixel intensity distribution curve of one or more columns of pixels along a first predetermined starting position of the first image;
  • the second pixel light intensity distribution curve includes a pixel light intensity distribution curve of one or more columns of pixels along a second predetermined starting position of the second image.
  • FIG. 5 is a block diagram 3 of an optional structure of a phase difference determining apparatus according to an embodiment of the present invention. As shown in FIG. 5, the determining unit 42 may further include:
  • the calculating subunit 50 is configured to calculate a position difference between a peak pixel of the first pixel light intensity distribution curve and a peak pixel of the second pixel light intensity distribution curve;
  • the determining subunit 52 is arranged to multiply the position difference by the size of the unit pixel in the vertical direction to obtain a phase difference.
  • This alternative embodiment uses a single camera to acquire photo phase information on a conventional image sensor sensor.
  • This alternative embodiment designs a camera that allows all pixels of the image sensor to be imaged normally and also to obtain image phase information.
  • FIG. 6 is a structural block diagram of an apparatus according to an alternative embodiment of the present application. As shown in FIG. 6, the module of this embodiment includes:
  • the image acquisition module 60 is configured to collect a photo of the output of the camera for processing by the back end;
  • Horizontal drive motor 62 configured to move the camera in a horizontal direction so that the camera acquires a photo with phase information
  • the photo storage module 64 is configured to store the photographed camera in a horizontal direction to obtain the phase difference information for the back end;
  • Phase difference calculation module 66 configured to process two phase information maps in the storage module to obtain phases Position information.
  • two photos with a certain parallax (the distance that the camera moves two pixels horizontally) are sequentially collected, and then the light intensity distribution curves of the corresponding pixels in the two photos are respectively calculated, and the corresponding pixel lights in the two images are compared.
  • the phase difference information of the strong distribution curve can calculate the phase difference information.
  • an image sensor in an ordinary camera is used. All pixel points of the image sensor can be used for normal imaging, and the objective resolution and noise test are superior to the image sensor with special pixels. The more pairs of pixels that acquire phase difference information, the more accurate the final calculated phase difference information.
  • only one camera can be used to make the effect of the dual camera, so that the cost is greatly reduced, and the difficulty of the post-installation is also greatly reduced.
  • the phase difference determining method of the present embodiment can acquire phase difference information of an image without sacrificing the original pixels of the image sensor and without adding an additional camera.
  • the specific implementation method includes: FIG. 7 is a schematic diagram of camera movement according to an optional embodiment of the present invention. As shown in FIG. 7 , in this embodiment, by acquiring the phase information of the captured scene by moving the camera lens barrel in the x direction, the calculation can be performed. Image phase difference information.
  • phase2 second image
  • FIG. 8 is a schematic diagram of a pixel distribution of a camera-captured image according to an alternative embodiment of the present application.
  • the image in FIG. 8 includes 0-3151 rows, 0-4255 columns, if photographed.
  • the photo pixel is 13M, taking column 0 (columns), that is, the channel is the image of BGBG...BG column
  • the light intensity distribution curve of the prime because the light intensity distribution of the pixels on the same column exhibits a Gaussian distribution, the light intensity distribution curve on the 0th column is a curve similar in shape to a sinusoid.
  • modules may be implemented by software or hardware.
  • the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the modules are respectively located in multiple processes. In the device.
  • Embodiments of the present invention also provide a computer readable storage medium.
  • the computer readable storage medium may be configured to store program code for performing the following steps:
  • the foregoing storage medium may include, but is not limited to, any one of the following: a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), A variety of media that can store program code, such as a hard disk, a disk, or an optical disk.
  • the processor performs, according to the stored program code in the computer readable storage medium, the first image captured by the camera at the first location, and the second image captured by the camera at the second location;
  • the processor determines, according to the stored program code in the computer readable storage medium, the first image and the second image according to the first pixel information of the first image and the second pixel information of the second image.
  • the phase difference between the images is not limited to the stored program code in the computer readable storage medium.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device, which can be centralized on a single computing device, or distributed over a plurality of Optionally, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be The steps shown or described are performed in a different order than that herein, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.
  • FIG. 9 is a schematic structural diagram of a hardware of a device according to an embodiment of the present invention. As shown in FIG. 9, the device includes:
  • One or more processors 710, one processor 710 is taken as an example in FIG. 9;
  • the device may also include an input device 730 and an output device 740.
  • the processor 710, the memory 720, the input device 730, and the output device 740 in the device may be connected by a bus or other means, and the bus connection is taken as an example in FIG.
  • the memory 720 is used as a computer readable storage medium for storing software programs, computer executable programs, and modules, such as the program instructions/modules corresponding to the method for determining the phase difference in the embodiment of the present invention (for example, as shown in FIG. 2)
  • the processor 710 executes various functional applications and data processing of the server by executing software programs, instructions, and modules stored in the memory 720, that is, a method of determining the phase difference of the above-described method embodiments.
  • the memory 720 may include a storage program area and an storage data area, wherein the storage program area may store an operating system, an application required for at least one function; the storage data area may store data created according to usage of the terminal device, and the like.
  • memory 720 can include high speed random access memory, and can also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device.
  • memory 720 can optionally include memory remotely located relative to processor 710, which can be connected to the terminal device over a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.
  • Input device 730 can be used to receive input numeric or character information and to generate key signal inputs related to user settings and function control of the terminal.
  • the output device 740 can include a display device such as a display screen.
  • the one or more modules are stored in the memory 720, and when executed by the one or more processors 710, the method of determining the phase difference of the above-described embodiments and the optional real-time mode is performed.
  • the method for determining the phase difference solves the problem that the camera needs to sacrifice the original pixel of the image sensor or needs to additionally increase the camera when acquiring the phase information in the related art, thereby achieving the camera can achieve phase focusing and guarantee Image quality, no additional camera effect.

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Abstract

L'invention concerne un procédé et un appareil de détermination d'une différence de phase. Le procédé consiste : à acquérir une première image prise par une caméra dans une première position et à acquérir une seconde image prise par la caméra dans une seconde position (S102) ; à déterminer une différence de phase entre la première image et la seconde image en fonction de premières informations de pixel sur la première image et de secondes informations de pixels sur la seconde image (S104). Les problèmes dans l'état de la technique selon lesquels il est nécessaire de sacrifier un pixel d'origine d'un capteur d'images ou selon lesquels une caméra supplémentaire doit être ajoutée lorsqu'une caméra acquiert des informations de phase sont résolus, de sorte que la caméra peut non seulement achever une focalisation de phase, mais garantir également la qualité d'imagerie, sans caméra supplémentaire.
PCT/CN2016/078979 2016-02-01 2016-04-11 Procédé et appareil de détermination de différence de phase WO2017133075A1 (fr)

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CN201610072813.0A CN107026969A (zh) 2016-02-01 2016-02-01 相位差的确定方法及装置
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CN108259727A (zh) * 2018-03-21 2018-07-06 维沃移动通信有限公司 一种景深图像生成方法及移动终端
CN109788199B (zh) * 2019-01-30 2021-02-05 上海创功通讯技术有限公司 一种适用于具有双摄像头终端的对焦方法
CN110475071B (zh) * 2019-09-19 2021-06-04 厦门美图之家科技有限公司 相位对焦方法、装置、电子设备和机器可读存储介质

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