WO2017012372A1 - Procédé et appareil de commande de prise de vues pour un terminal, et terminal - Google Patents

Procédé et appareil de commande de prise de vues pour un terminal, et terminal Download PDF

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Publication number
WO2017012372A1
WO2017012372A1 PCT/CN2016/078092 CN2016078092W WO2017012372A1 WO 2017012372 A1 WO2017012372 A1 WO 2017012372A1 CN 2016078092 W CN2016078092 W CN 2016078092W WO 2017012372 A1 WO2017012372 A1 WO 2017012372A1
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WIPO (PCT)
Prior art keywords
frames
adjacent
terminal
preview images
pair
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PCT/CN2016/078092
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English (en)
Chinese (zh)
Inventor
王世强
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宇龙计算机通信科技(深圳)有限公司
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Publication of WO2017012372A1 publication Critical patent/WO2017012372A1/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
    • H04N23/73—Circuitry for compensating brightness variation in the scene by influencing the exposure time

Definitions

  • the present invention relates to the field of terminal camera technology, and in particular, to a camera control method for a terminal, a camera control device for a terminal, and a terminal.
  • the terminal when the terminal is taking photos, if the camera shakes or shoots a moving object, the captured image will often be blurred.
  • a more common method in the related art is to perform optical image stabilization, that is, by detecting the direction of the cell phone shake, and adopting a method of reverse compensation to prevent blurring of the picture.
  • this method can detect and compensate for cell phone shake from four directions or eight directions, the camera effect is still not satisfactory for large jitter or shooting motion pictures.
  • the present invention is based on at least one of the above technical problems, and proposes a new camera control scheme for a terminal, which can effectively prevent the terminal from blurring when the terminal photographs a moving object or when the shooting process is shaken, and optimizes.
  • the camera's photo effect is based on at least one of the above technical problems, and proposes a new camera control scheme for a terminal, which can effectively prevent the terminal from blurring when the terminal photographs a moving object or when the shooting process is shaken, and optimizes.
  • the camera's photo effect is based on at least one of the above technical problems, and proposes a new camera control scheme for a terminal, which can effectively prevent the terminal from blurring when the terminal photographs a moving object or when the shooting process is shaken, and optimizes.
  • the camera's photo effect is based on at least one of the above technical problems, and proposes a new camera control scheme for a terminal, which can effectively prevent the terminal from blurring when the terminal photographs a moving object or when the shooting process is shaken, and optimizes
  • the present invention provides a photographing control method for a terminal, comprising: acquiring a preview image of two adjacent frames captured by a lens of the terminal when receiving a photographing instruction; The preview image of the frame is subjected to comparative analysis to determine a blur degree between the preview images of the adjacent two frames; and the exposure of the terminal when photographing is calculated according to the blur degree between the preview images of the adjacent two frames Duration; take a picture according to the exposure time.
  • the preview images of the adjacent two frames are compared and analyzed to determine the adjacent
  • the blur degree between the preview images of the two frames and calculating the exposure duration of the terminal when photographing according to the blur degree between the preview images of the adjacent two frames, so that the terminal can be based on the motion state of the current subject to be photographed and/or the terminal
  • the jitter state adjusts the exposure time in time, which can effectively prevent the image captured by the terminal from being blurred or smear, and optimizes the photographing effect of the terminal.
  • the ambiguity between the preview images of two adjacent frames is inversely related to the exposure time, and the higher the ambiguity, the shorter the exposure time, in other words, the more intense the motion of the object to be photographed or the greater the amplitude of the terminal jitter, The higher the blur between the preview images of two adjacent frames, the faster the shot is taken to obtain a clear picture by reducing the exposure time.
  • the step of performing comparison analysis on the preview images of the two adjacent frames to determine the ambiguity between the preview images of the adjacent two frames specifically includes: The preview images of the frames are respectively divided into at least one image block of the same specification; the matching ratios of at least one pair of image blocks located at the same position in the preview images of the adjacent two frames are respectively compared; according to the at least one pair of image blocks The matching degree of any pair of image blocks, and the correspondence between the preset matching ratio and the ambiguity, and calculating the ambiguity between the preview images of the adjacent two frames.
  • the step of calculating the ambiguity between the preview images of the adjacent two frames specifically includes: calculating a sum of ambiguities of all the image blocks in the at least one pair of image blocks, and summing the sums As the degree of blur between the preview images of the adjacent two frames.
  • the corresponding relationship between the preset matching rate and the ambiguity is an inverse correlation, that is, the higher the matching rate of any pair of image blocks, the lower the ambiguity between the pair of image blocks.
  • the step of comparing the matching ratios of the at least one pair of image blocks located at the same position in the preview images of the adjacent two frames respectively includes: specifically, for any one of the at least one pair of image blocks a pair of image blocks, calculating a Hamming sequence of any one of the pair of image blocks; determining the pair of image blocks according to a Hamming sequence of two of the pair of image blocks Match rate.
  • the Hamming sequence is similar to Hamming coding, and the matching ratio of the adjacent two frames is calculated by determining the matching ratio of any pair of image blocks according to the Hamming sequence of the two image blocks in any pair of image blocks.
  • the ambiguity between images provides the necessary basis.
  • the exposure duration of the terminal when photographing is calculated according to the following formula:
  • T_m represents the exposure duration
  • F_a represents the preview image frame rate of the lens
  • sensor_linecount represents the hardware parameter of the sensor of the lens
  • N represents the ambiguity between the preview images of the adjacent two frames.
  • the exposure duration of the terminal at the time of photographing is calculated, so that the terminal can timely and according to the motion state of the current object to be photographed and/or the jitter state of the terminal. Adjusting the exposure time, which can effectively prevent the image captured by the terminal from appearing blur or smear, and optimize the camera effect of the terminal.
  • the ambiguity between the preview images of two adjacent frames is inversely related to the exposure time, and the higher the ambiguity, the shorter the exposure time, in other words, the more intense the motion of the object to be photographed or the greater the amplitude of the terminal jitter, The higher the blur between the preview images of two adjacent frames, the faster the shot is taken to obtain a clear picture by reducing the exposure time.
  • the processing unit includes: a dividing unit, configured to respectively divide the preview images of the adjacent two frames into at least one image block of the same specification; and compare units for respectively comparing the a matching ratio of at least one pair of image blocks located at the same position in the preview images of two adjacent frames; a second calculating unit, configured to select a matching rate according to any one of the at least one pair of image blocks, and preset The correspondence between the matching ratio and the ambiguity, and calculating the ambiguity between the preview images of the adjacent two frames.
  • the second calculating unit is specifically configured to: calculate a sum of ambiguities of all pairs of image blocks in the at least one pair of image blocks, and use the sum as a preview image of the adjacent two frames The degree of ambiguity between.
  • the corresponding relationship between the preset matching rate and the ambiguity is an inverse correlation, that is, the higher the matching rate of any pair of image blocks, the lower the ambiguity between the pair of image blocks.
  • the comparing unit includes: a third calculating unit, configured to calculate any one of the pair of image blocks for any one of the at least one pair of image blocks a Hamming sequence of blocks; a determining unit, configured to determine a matching ratio of the pair of image blocks according to a Hamming sequence of two image blocks in any one of the pair of image blocks.
  • the Hamming sequence is similar to Hamming coding, and the matching ratio of the adjacent two frames is calculated by determining the matching ratio of any pair of image blocks according to the Hamming sequence of the two image blocks in any pair of image blocks.
  • the ambiguity between images provides the necessary basis.
  • the first calculating unit calculates an exposure duration of the terminal when taking a photo according to the following formula:
  • T_m represents the exposure duration
  • F_a represents the preview image frame rate of the lens
  • sensor_linecount represents the hardware parameter of the sensor of the lens
  • N represents the ambiguity between the preview images of the adjacent two frames.
  • the present invention also provides a terminal, comprising the camera control device for a terminal according to any of the above technical solutions.
  • FIG. 1 is a schematic flow chart showing a photographing control method for a terminal according to an embodiment of the present invention
  • FIG. 2 shows a schematic block diagram of a photographing control apparatus for a terminal according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram showing a process flow of a photographing anti-blurring system according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram showing a process flow of photographing anti-blurring according to an embodiment of the present invention
  • Figure 5 illustrates a terminal in accordance with one embodiment of the present invention.
  • FIG. 1 shows a schematic flow chart of a photographing control method for a terminal according to an embodiment of the present invention.
  • a photographing control method for a terminal includes: Step 102, when receiving a photographing instruction, acquiring a preview image of two adjacent frames captured by a lens of the terminal Step 104: Perform comparison analysis on the preview images of the adjacent two frames to determine the degree of blur between the preview images of the adjacent two frames; Step 106, according to the preview images between the adjacent two frames The blur degree is calculated, and the exposure duration of the terminal when photographing is calculated; in step 108, photographing is performed according to the exposure duration.
  • the exposure duration of the terminal at the time of photographing is calculated, so that the terminal can timely and according to the motion state of the current object to be photographed and/or the jitter state of the terminal. Adjusting the exposure time, which can effectively prevent the image captured by the terminal from appearing blur or smear, and optimize the camera effect of the terminal.
  • the ambiguity between the preview images of two adjacent frames is inversely related to the exposure time, and the higher the ambiguity, the shorter the exposure time, in other words, the more intense the motion of the object to be photographed or the greater the amplitude of the terminal jitter, The higher the blur between the preview images of two adjacent frames, the faster the shot is taken to obtain a clear picture by reducing the exposure time.
  • the step of performing comparison analysis on the preview images of the two adjacent frames to determine the ambiguity between the preview images of the adjacent two frames specifically includes: The preview images of the frames are respectively divided into at least one image block of the same specification; and the matching ratios of at least one pair of image blocks located at the same position in the preview images of the adjacent two frames are respectively compared; And calculating a ambiguity between the preview images of the adjacent two frames according to a matching ratio of any one of the at least one pair of image blocks and a preset matching relationship between the matching ratio and the ambiguity.
  • the step of calculating the ambiguity between the preview images of the adjacent two frames specifically includes: calculating a sum of ambiguities of all the image blocks in the at least one pair of image blocks, and summing the sums As the degree of blur between the preview images of the adjacent two frames.
  • the corresponding relationship between the preset matching rate and the ambiguity is an inverse correlation, that is, the higher the matching rate of any pair of image blocks, the lower the ambiguity between the pair of image blocks.
  • the step of comparing the matching ratios of the at least one pair of image blocks located at the same position in the preview images of the adjacent two frames respectively includes: specifically, for any one of the at least one pair of image blocks a pair of image blocks, calculating a Hamming sequence of any one of the pair of image blocks; determining the pair of image blocks according to a Hamming sequence of two of the pair of image blocks Match rate.
  • the Hamming sequence is similar to Hamming coding, and the matching ratio of any pair of image blocks is determined according to the Hamming sequence of the two image blocks in any pair of image blocks, for calculation
  • the ambiguity between the preview images of two adjacent frames provides the necessary basis.
  • the exposure duration of the terminal when photographing is calculated according to the following formula:
  • T_m represents the exposure duration
  • F_a represents the preview image frame rate of the lens
  • sensor_linecount represents the hardware parameter of the sensor of the lens
  • N represents the ambiguity between the preview images of the adjacent two frames.
  • FIG. 2 shows a schematic block diagram of a photographing control apparatus for a terminal according to an embodiment of the present invention.
  • a photographing control apparatus 200 for a terminal includes an obtaining unit 202, a processing unit 204, a first calculating unit 206, and a photographing unit 208.
  • the acquiring unit 202 is configured to acquire a preview image of two adjacent frames captured by the lens of the terminal when receiving the photographing instruction, and the processing unit 204 is configured to compare the preview images of the adjacent two frames. An analysis to determine a degree of blur between preview images of the adjacent two frames;
  • the first calculating unit 206 is configured to calculate an exposure duration of the terminal when the camera is photographed according to the blur degree between the preview images of the adjacent two frames, and the photographing unit 208 is configured to perform photographing according to the exposure duration.
  • the exposure duration of the terminal at the time of photographing is calculated, so that the terminal can timely and according to the motion state of the current object to be photographed and/or the jitter state of the terminal. Adjusting the exposure time, which can effectively prevent the image captured by the terminal from appearing blur or smear, and optimize the camera effect of the terminal.
  • the ambiguity between the preview images of two adjacent frames is inversely related to the exposure time, and the higher the ambiguity, the shorter the exposure time, in other words, the more intense the motion of the object to be photographed or the greater the amplitude of the terminal jitter, The higher the blur between the preview images of two adjacent frames, the faster the shot is taken to obtain a clear picture by reducing the exposure time.
  • the processing unit 204 includes: a dividing unit 2042, configured to respectively divide the preview images of the adjacent two frames into at least one image block of the same specification; and the comparing unit 2044 is configured to respectively Comparing a matching ratio of at least one pair of image blocks located at the same position in the preview images of the adjacent two frames; a second calculating unit 2046, configured to select a matching rate according to any one of the at least one pair of image blocks And a preset correspondence between the matching ratio and the ambiguity, and calculating a ambiguity between the preview images of the adjacent two frames.
  • the second calculating unit 2046 is specifically configured to: calculate a sum of ambiguities of all pairs of the image blocks in the at least one pair of image blocks, and use the sum as a preview of the adjacent two frames The degree of ambiguity between images.
  • the corresponding relationship between the preset matching rate and the ambiguity is an inverse correlation, that is, the higher the matching rate of any pair of image blocks, the lower the ambiguity between the pair of image blocks.
  • the comparing unit 2044 includes: a third calculating unit 2044A, configured to calculate any one of the pair of image blocks for any one of the at least one pair of image blocks a Hamming sequence of an image block; a determining unit 2044B, configured to determine a matching ratio of the pair of image blocks according to a Hamming sequence of two image blocks in the pair of image blocks.
  • the Hamming sequence is similar to Hamming coding, and the matching ratio of the adjacent two frames is calculated by determining the matching ratio of any pair of image blocks according to the Hamming sequence of the two image blocks in any pair of image blocks.
  • the ambiguity between images provides the necessary basis.
  • the first calculating unit 206 calculates an exposure duration of the terminal when taking a photo according to the following formula:
  • T_m represents the exposure duration
  • F_a represents the preview image frame rate of the lens
  • sensor_linecount represents the hardware parameter of the sensor of the lens
  • N represents the ambiguity between the preview images of the adjacent two frames.
  • the operation process of the camera anti-blurring system includes:
  • Step 302 Acquire data of preview images of two consecutive frames (ie, the first frame and the second frame in the figure).
  • step 304 a photo anti-blur processing is performed.
  • Step 308 taking a photo according to the exposure time.
  • FIG. 4 shows a specific flow of the camera anti-blurring process in FIG. 3, including:
  • Step 402 extracting two consecutive frames of preview images.
  • Step 404 performing block processing on each frame image in the two frame preview images.
  • those skilled in the art can determine the number of blocks according to actual conditions, such as 64 blocks.
  • step 406 a Hamming sequence for each block is calculated.
  • the Hamming sequence is similar to the Hamming code.
  • Step 408 Compare the Hamming sequence of each pair of blocks corresponding to the positions in the two frames of images.
  • step 410 the matching rate of each pair of blocks and the number of blocks of the same matching rate are counted.
  • Step 412 assign a ambiguity to the matching ratio of each pair of blocks according to a preset correspondence between the matching ratio and the ambiguity, and calculate a sum of all the ambiguities of the blocks as the ambiguity between the two frames.
  • Table 1 For the correspondence between the matching rate and the ambiguity, refer to Table 1:
  • the ambiguity between the two frames of preview images is brought into the exposure time calculation formula to obtain a suitable exposure time.
  • the formula for calculating the exposure time can refer to the formula: T_m represents the exposure time, F_a represents the preview image frame rate of the terminal lens, sensor_linecount represents the hardware parameter of the lens sensor, and N represents the ambiguity between successive two frames of preview images.
  • the following problems are mainly solved in the embodiment: 1. Implementing block processing on two consecutive frames of preview images; 2. Using Hamming sequences to compare matching degrees of image blocks at the same position; 3. Different for The image block matching degree introduces the corresponding ambiguity; 4. The design formula of the exposure time that changes according to the ambiguity change is designed.
  • Figure 5 illustrates a terminal in accordance with one embodiment of the present invention.
  • the present invention also provides a terminal 500 comprising the photographing control device 200 for a terminal according to any of the above aspects.
  • the technical solution of the present invention can be applied to multiple scenarios: for example, the user sits on a bumpy vehicle, and if a stationary object is to be photographed, the ordinary mobile phone may appear blurred, and the technical solution of the present invention can be adopted. Preview the data for two consecutive frames, calculate the vibration amplitude of the camera, give the appropriate photo exposure time, make the shooting picture clear; Scene 2: When the mobile phone is stationary, when shooting a moving pedestrian or vehicle, the technical solution of the invention can prevent the movement The blurring of objects or the appearance of smear greatly enhances the user experience.
  • the present invention proposes a new camera control scheme for a terminal, which can effectively prevent the terminal from being blurred when the terminal photographs a moving object or when the shooting process is shaken. Optimized the camera's photo effect.

Abstract

L'invention concerne un procédé et un appareil de commande de prise de vues pour un terminal, et un terminal. Le procédé de commande de prise de vues pour un terminal comprend les étapes consistant à : à réception d'une instruction de prise de vues, acquérir des images de prévisualisation de deux trames adjacentes capturées par un objectif du terminal ; exécuter une analyse comparative sur les images de prévisualisation des deux trames adjacentes de sorte à déterminer l'ambiguïté entre les images de prévisualisation des deux trames adjacentes ; d'après l'ambiguïté entre les images de prévisualisation des deux trames adjacentes, calculer une durée d'exposition au moment où le terminal exécute la prise de vues ; et exécuter la prise de vues selon la durée d'exposition. Lorsqu'un terminal photographie un objet mobile ou bouge durant une prise de vues, l'invention l'empêche de prendre une photo floue, optimisant ainsi un effet de prise de vues du terminal.
PCT/CN2016/078092 2015-07-17 2016-03-31 Procédé et appareil de commande de prise de vues pour un terminal, et terminal WO2017012372A1 (fr)

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CN112822412A (zh) * 2020-12-28 2021-05-18 维沃移动通信有限公司 曝光方法和电子设备
CN113676673A (zh) * 2021-08-10 2021-11-19 广州极飞科技股份有限公司 图像采集方法、图像采集系统及无人设备
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CN110475072B (zh) 2017-11-13 2021-03-09 Oppo广东移动通信有限公司 拍摄图像的方法、装置、终端和存储介质
CN109698906B (zh) * 2018-11-24 2021-01-26 四川鸿景润科技有限公司 基于图像的抖动处理方法及装置、视频监控系统
CN110493522A (zh) * 2019-08-26 2019-11-22 Oppo广东移动通信有限公司 防抖方法和装置、电子设备、计算机可读存储介质
CN110868550B (zh) * 2019-11-25 2021-04-06 维沃移动通信（杭州）有限公司 一种拍照方法及终端设备电子设备
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CN113676673A (zh) * 2021-08-10 2021-11-19 广州极飞科技股份有限公司 图像采集方法、图像采集系统及无人设备

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