WO2016161734A1 - Procédé et dispositif de mise au point automatique - Google Patents

Procédé et dispositif de mise au point automatique Download PDF

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WO2016161734A1
WO2016161734A1 PCT/CN2015/086686 CN2015086686W WO2016161734A1 WO 2016161734 A1 WO2016161734 A1 WO 2016161734A1 CN 2015086686 W CN2015086686 W CN 2015086686W WO 2016161734 A1 WO2016161734 A1 WO 2016161734A1
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focus
contrast value
position corresponding
grayscale
threshold
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Chinese (zh)
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慕千里
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ZTE Corp
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ZTE Corp
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/32—Means for focusing
    • G03B13/34—Power focusing
    • G03B13/36—Autofocus systems

Definitions

  • the present invention relates to the field of digital image processing technologies, and in particular, to a method and apparatus for autofocus.
  • the focal length (f), object distance (u) and image distance (v) of the lens need to meet:
  • the sharpness and detail of the image are rich, and in the spatial domain, the grayscale contrast value of the adjacent pixel points is the largest.
  • the grayscale contrast value of the image in the in-focus state is maximized by extracting the contour of the focus window of the image and the grayscale contrast value of the edge. Therefore, the lens is moved by the motor to change the image distance, and the grayscale contrast value of the acquired image is calculated in real time, and the position where the grayscale contrast value is the largest is the focus position.
  • the gray contrast curve has three characteristics, 1) unimodality, that is, only one gray contrast maximum; 2) Monotonicity, that is, on both sides of the grayscale contrast maximum, the grayscale contrast curve monotonically decreases or decreases; 3) polarity, it can be judged whether the current focus position is before or after the focus.
  • the lens moves from the starting position to the ending position, and the entire stroke is completed according to a fixed speed, a fixed step size, and a fixed step number, since the object distance and the image distance of the lens are not linear, as shown in the figure. 2 is shown.
  • This method has the following drawbacks: if the step size is small, the number of steps increases, causing the focusing time to be too long, and if the step size is large, the focus is inaccurate and unstable.
  • the embodiment of the invention provides a method and a device for autofocusing, which solves the problem that the image quality is poor due to the fixed speed and step size of the motor cannot be accurately focused in the related art.
  • a method for autofocusing comprising: acquiring a blur diameter value of an image sensor of a terminal, an aperture value of a lens, and a motion parameter of the motor; according to the blur diameter value, The aperture value of the lens and the motion parameter of the motor calculate a range of object distances of the steps of the motor; in the stepping step, the step of the object distance range in the range of the object distance of other steps is removed; The grayscale contrast value of the corresponding position of each step is determined; a step position is determined as the focus of the focus from the step remaining after the culling according to the gradation contrast value.
  • N A is the number of the farthest step determined in the first focus step
  • B n is the second focus step.
  • determining a grayscale contrast value of one of the inflection points of the grayscale contrast value of the position corresponding to three consecutive steps in the first focusing step as the first threshold, and the second focusing step
  • the grayscale contrast value of one of the inflection points of the grayscale contrast value corresponding to the three consecutive steps is determined as a second threshold, and the grayscale contrast value of the focus is greater than the second threshold, the second threshold And greater than the first threshold; acquiring a grayscale contrast value of the current focus window, if the current grayscale contrast value is greater than the second threshold, less than the grayscale contrast value of the focus, performing the step of selecting the third focus step; if the current gray If the degree contrast value is greater than the first threshold, less than the second threshold, the step of selecting the second focus step is performed; if the current gray level contrast value is less than the first threshold, the step of selecting the first focus step is performed.
  • the speed of movement of the motor is greater according to a distance between two adjacent focal points Small control.
  • An apparatus for autofocusing comprising: a parameter acquisition module, configured to acquire a blur diameter value of an image sensor in the terminal, an aperture value of the lens, and a motion parameter of the motor; and a distance range calculation module configured to be based on the blur diameter value,
  • the aperture value of the lens and the motion parameter of the motor calculate a range of object distances of the various steps of the motor;
  • the step culling module is configured to remove the object distance range in the step by other distances in the stepping distance Stepping;
  • a grayscale contrast obtaining module configured to obtain a grayscale contrast value of a corresponding position of each step remaining after the culling;
  • the focus determining module is set to a step that is left after the culling according to the grayscale contrast value Determines the position of a step as the focus of focus.
  • any position corresponding to the two steps with a large grayscale contrast value is used as the focus of focus; otherwise, the position corresponding to the step with the largest grayscale contrast value is selected as the focus of focus;
  • X i is the remaining step In,
  • a n is the first focus step, and i and n are positive integers.
  • the focus determining module further includes: a second focus step selection sub-module, configured to select an inflection point after the gray-scale contrast value of the position corresponding to three consecutive steps in the first focus step
  • the second focus determination sub-module setting In order to control the movement of the motor to push the focus window to focus on the position corresponding to the second focus step from far to near, when the gray contrast value of the position corresponding to three consecutive steps in the second focus step has an inflection point
  • the position is the focus of focus; N A is the number of the farthest step determined in the first focus step, and B n is the second focus step.
  • the three focus steps are separately focused, and when the gray contrast value of the position corresponding to the three consecutive steps in the third focus step has an inflection point, the gray contrast value of the position corresponding to the three consecutive steps is selected to be the largest.
  • the corresponding position of the step is used as the focus of focus; otherwise, the position corresponding to the step with the largest gray contrast value is selected as the focus of focus; C n is the third focus step, and N B is the second focus step Determine the number of the most recent step.
  • the method further includes: a threshold determining module, configured to determine a grayscale contrast value of one of the inflection points of the grayscale contrast value corresponding to the position corresponding to three consecutive steps in the first focusing step as the first a threshold value, where a grayscale contrast value of one of the inflection points of the grayscale contrast value of the position corresponding to three consecutive steps in the second focus step is determined as a second threshold, and the grayscale contrast value of the focus is greater than a second threshold, the second threshold is greater than the first threshold; the processing module is configured to obtain a grayscale contrast value of the current focus window, and if the current grayscale contrast value is greater than the second threshold, less than the grayscale contrast value of the focus, Sending a trigger start command to the third focus step selection submodule; if the current gray scale contrast value is greater than the first threshold and less than the second threshold, sending a trigger start command to the second focus step selection submodule; Such as If the current grayscale contrast value is less than the first threshold, a triggering start command
  • Embodiments of the present invention provide a method and apparatus for autofocusing, which are obtained by acquiring a blur diameter value of an image sensor of a terminal, an aperture value of a lens, and a motion parameter of a motor, and calculating a range of object distances of each step of the motor, and rejecting a step of the object distance in the range of the object distance of the other steps, and then obtaining the gray contrast value of the corresponding position of each step remaining after the culling; the remaining steps after the gradation according to the gradation value Into the middle to determine a step position as the focus of focus.
  • the scheme eliminates the steps in the object distance range of other steps, so that the newly obtained stepping object distance range does not overlap, the number of motor movements is reduced, and the moving step of the motor is also performed.
  • the change has been made to achieve fast autofocus without affecting its image quality and improving the user experience.
  • Figure 1 is a two-dimensional map of gray scale contrast and image distance in the terminal
  • Figure 2 is a graph of image distance and object distance
  • FIG. 3 is a flowchart of a method for autofocus according to Embodiment 1 of the present invention.
  • FIG. 5 is a graph of image distance and gray scale contrast according to Embodiment 1 of the present invention.
  • FIG. 6 is a schematic structural diagram of an apparatus for autofocus according to Embodiment 2 of the present invention.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • FIG. 3 a flowchart of a method for autofocus according to Embodiment 1 of the present invention is shown in FIG. 3 .
  • S301 Acquire a blur diameter value of an image sensor of the terminal, an aperture value of the lens, and a motion parameter of the motor;
  • the terminal in the embodiment of the present invention includes: a mobile phone, a tablet, a palmtop computer, a camera, a camera, etc.;
  • the motion parameters of the motor include: the motor stroke and the oscillation frequency and the oscillation time when the motor drives the lens to move; in this embodiment, by reading The parameters written in the terminal memory are taken to obtain the blur diameter value of the image sensor, the aperture value of the lens, the motor stroke, and the oscillation frequency and the oscillation time when the motor drives the lens movement; the oscillation frequency and the oscillation time for the motor motion can also be Measured by a special measuring instrument;
  • S302 Calculate a range of object distances of each step of the motor according to the fuzzy diameter value, the aperture value of the lens, and the motion parameter of the motor;
  • the length and speed of each step of the motor are set according to the blur diameter value, the aperture value of the lens, and the motion parameter of the motor; the length of the motor stroke and the stepping speed
  • S is the motor stroke and u is the length of the step
  • different motors are matched with different lenses, the motor oscillation frequency and the oscillation time are different
  • v i the motion speed
  • t f is the oscillation time
  • f′ is the oscillation frequency
  • the object distance range corresponding to each step includes: Near Focus Limit: And Far Focus Limit:
  • H is the hyperfocal distance
  • A is the lens aperture value
  • d is the image sensor blur diameter
  • the corresponding u N and u F after each step movement of the motor are calculated by the above method
  • the object distance ranges of adjacent steps can be obtained by comparing the values of u N and u F in adjacent steps, and selecting a step that can cover other focus objects, that is, The object distance range is eliminated in steps of other object distances, so that in the remaining steps, the distances of adjacent steps are no longer the same, so that the distance of each step of the motor is no longer the same, but It is also possible to cover the range of object distances that it can cover, and in this step, the extra steps are eliminated; for example, in this embodiment, it is assumed that the new moving step of the motor is X i , where X i is After the culling, the step remaining, i is a positive integer, that is, the motor will move according to the position corresponding to the new step X i , and the number of steps for completing the formation of the entire motor will be reduced;
  • the grayscale contrast value corresponding to each step corresponding position is obtained, usually by controlling the motor to move to the stepping Corresponding position, and focusing on the position, thereby obtaining a grayscale contrast value of the pixel in the focus window;
  • S305 determining, according to the grayscale contrast value, a step position from the step remaining after the culling as a focus of focusing;
  • the gradation contrast values corresponding to the respective steps are obtained, and the maximum gradation contrast value is selected among the obtained gradation contrast values.
  • the position of the corresponding step is used as the focus of the focus, or the position where the gradation contrast value is selected to be in the range of the image in which the high-definition imaging is satisfied is determined as the focus of the focus.
  • the repeated stepping reduces the number of movements of the motor, and the quality of the imaging is not degraded, and the possibility of fast focusing can be achieved, thereby improving the user experience.
  • Any position is the focus of focus; otherwise, the position corresponding to the step with the largest gray contrast value is selected as the focus of focus; X i is the remaining step, A n is the first focus step, i, n are A positive integer; in this embodiment, by selecting a step that satisfies the above formula as the first focus step, and focusing only on the selected first focus step, calculating the corresponding step from near to far The grayscale contrast value of the position, after the inflection point occurs in the grayscale contrast value of the position corresponding to three consecutive steps in the first focus step, the focus processing of the other first focus step positions is not required, only in the The position corresponding to three consecutive steps Any position corresponding between two steps with a large gray-scale contrast value as a focus of focus; any position includes a position corresponding to any step between two steps with a large gray-scale contrast value, Or the position corresponding to the remaining step after any culling between the two steps with a large grayscale contrast value; selecting any of the positions as the focus of the focus can not only achieve
  • the position is respectively focused, that is, during the current focusing process, after the focus of the first focus step is stopped, that is, when the gradation contrast value in the first focus step has an inflection point; when the second focus step is in progress If an inflection point occurs in the gray contrast value of the position corresponding to the three consecutive steps, any position corresponding to the
  • any position corresponding to the two steps with a large grayscale contrast value is used as the focus of the focus; likewise, any position includes any step between the two steps with a large grayscale contrast value.
  • Position, or the position corresponding to the remaining step after any culling between the two steps with a large grayscale contrast value; selecting any of the positions as the focus of the focus more selectively achieves the accuracy of the focus may.
  • the corresponding position of the step is used as the focus of focus; C n is the third focus step, and N B is the number of the nearest step determined in the second focus step; through the above three steps, from near to far, from far Control the motor to move to the near and then from near to far, and separately focus to obtain the gray contrast value of each step position, and finally obtain the most accurate step position of the gray contrast value in the terminal. , Compared with the gradation current contrast value acquired by the gradation contrast value, how to obtain a controlled movement of the motor current so that the quality of the resulting photographs captured best.
  • the method for focusing on a target that needs to be photographed currently includes: first, determining a grayscale contrast value of one of the inflection points of the grayscale contrast value of the position corresponding to three consecutive steps in the first focus step as the first a threshold value, determining a grayscale contrast value of one of the inflection points of the grayscale contrast value corresponding to the three consecutive steps in the second focus step as a second threshold, and three consecutive steps in the third step
  • the grayscale contrast value of the corresponding position appears as the grayscale contrast value of the focus of the inflection point, the grayscale contrast value of the focus is greater than the second threshold, and the second threshold is greater than the first threshold; acquiring the current focus The grayscale contrast value of the window, if the current grayscale contrast value is greater than the second threshold and less than the grayscale contrast value of the focus, the step of selecting the third focus step is performed, thereby obtaining an accurate focus of the current target; if current The grayscale contrast value is greater than the first threshold, and less than the second threshold, the step of
  • the step of the second focus step in order to focus the accuracy, it is necessary to continue the step of performing the third one-step step, so that the determined focus focus will be more accurate; if the current gray scale contrast value is less than the first threshold, Then, the step of selecting the first focus step is performed, and the situation is similar to the above case, and will not be described here.
  • the speed of the motor movement is controlled according to the distance between two adjacent steps.
  • the speed of the motor also changes during the above-described determination of the grayscale contrast value of each focus step.
  • the scanning speed is x 1
  • the scanning speed is x 2
  • the scanning speed is x 3
  • FIG. 4 a detailed flowchart of a method for automatic multiple focus according to Embodiment 1 of the present invention is shown in FIG. 4 .
  • Figure 5
  • S401 reading a blur diameter of an image sensor written in a memory of the terminal, an aperture of the lens, a motor stroke, and an oscillation frequency and an oscillation time when the motor drives the lens to move;
  • S402 calculating a corresponding object distance range after each step movement of the motor according to the blur diameter, the aperture of the lens, the motor stroke, and the oscillation frequency and the oscillation time when the motor drives the lens to move;
  • the embodiment realizes the possibility of continuous focusing, and can realize focusing relatively quickly and accurately, not only improving the imaging quality, but also saving the focusing time and improving the user experience.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • FIG. 6 is a schematic structural diagram of an apparatus for autofocus according to Embodiment 2 of the present invention.
  • the autofocus apparatus 60 includes: a parameter acquisition module 601, an object distance range calculation module 602, and a step rejection module. 603, a grayscale contrast acquisition module 604 and a focus determination module 605;
  • the parameter acquisition module 601 is configured to acquire a blur diameter value of the image sensor in the terminal, an aperture value of the lens, and a motion parameter of the motor;
  • the object distance range calculation module 602 is configured to be based on the blur The diameter value, the aperture value of the lens, and the motion parameter of the motor calculate the object distance range of each step of the motor;
  • the step culling module 603 is configured to remove the step of the object distance range within the step distance of the other step in the stepping
  • Grayscale contrast acquisition module 604 is set to obtain each of the remaining after culling The grayscale contrast value of the corresponding position of the step;
  • the focus determining module 605 is configured to determine a position of the step as
  • Any position corresponding to the two large steps is used as the focus of focus; otherwise, the position corresponding to the step with the largest gray contrast value is selected as the focus of focus; X i is the remaining step, A n is the first A focus step, i, n is a positive integer.
  • the gray contrast value of the position corresponding to three consecutive steps in the second focus step has an inflection point, three consecutive steps are selected.
  • N A is The number of the farthest step determined in the first focus step
  • B n is the second focus step
  • the position corresponding to the step with the largest gray contrast value in the position corresponding to the three consecutive steps is selected as the focus of the focus. ; otherwise, the position corresponding to the step with the largest gray contrast value is selected as the focus of focus; C n is the third focus step, and N B is the number of the nearest step determined in the second focus step;
  • the autofocus device 60 further includes: a threshold determining module configured to determine a grayscale contrast value of one of the inflection points of the grayscale contrast value of the position corresponding to three consecutive steps in the first focusing step as the first threshold a grayscale contrast value of one of the inflection points of the grayscale contrast value corresponding to the position of the three consecutive steps in the second focus step is determined as a second threshold, and the grayscale contrast value of the focus is greater than the second threshold, The second threshold is greater than the first threshold; the processing module is configured to obtain the grayscale contrast value of the current focus window, and if the current grayscale contrast value is greater than the second threshold and less than the focus grayscale contrast value, the third focus step is selected.
  • a threshold determining module configured to determine a grayscale contrast value of one of the inflection points of the grayscale contrast value of the position corresponding to three consecutive steps in the first focusing step as the first threshold a grayscale contrast value of one of the inflection points of the grayscale contrast value corresponding to the position of the three consecutive
  • the submodule sends a trigger start command; if the current grayscale contrast value is greater than the first threshold and less than the second threshold, sending a trigger start command to the second focus step selection submodule; if the current grayscale contrast value is less than the first threshold , the trigger start command is sent to the first focus step selection sub-module.
  • Embodiments of the present invention provide a method and apparatus for autofocusing, which eliminates steps of a stepped object distance range within a range of other stepped object distances, and then obtains the remaining steps after the rejection.
  • the grayscale contrast value of the corresponding position; the position of one step is determined as the focus of the focus from the step remaining after the culling according to the gradation contrast value.
  • the scheme eliminates the step in the object distance range of other steps, so that the newly obtained stepping object distance ranges do not coincide, reducing the number of motor movements and the stepping distance of the motor movement. It has also been changed to achieve fast autofocus without affecting its image quality and improving the user experience.
  • the newly obtained stepped object distance ranges do not coincide, reducing motor movement.
  • the number of times, and the moving step size of the motor have also been changed, thereby achieving fast autofocus without affecting the image quality and improving the user experience.

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Abstract

L'invention porte sur un procédé et un dispositif de mise au point automatique. Le procédé de mise au point automatique comprend : l'acquisition d'une valeur de diamètre de flou d'un capteur d'image d'un terminal, d'une valeur d'ouverture d'une lentille et d'un paramètre de mouvement d'un moteur (S401); le calcul de plages de distances d'objet associées à divers pas du moteur en fonction de la valeur de diamètre de flou, de la valeur d'ouverture de la lentille et du paramètre de mouvement du moteur (S402); la suppression, parmi les pas, d'un pas pour lequel la plage de distances d'objet s'inscrit dans des plages de distances d'objet associées à d'autres pas (S403); l'acquisition de valeurs de contraste de gris associées à des emplacements correspondant aux pas restants suite à la suppression (S407); et la détermination, en fonction des valeurs de contraste de gris, de l'emplacement d'un pas parmi les pas restants suite à la suppression comme un point de mise au point focalisé (S406). L'invention résout le problème posé dans l'état de la technique par la qualité d'image médiocre due à une mauvaise mise au point du fait d'une vitesse fixe et d'un pas fixe d'un moteur. Elle permet d'obtenir une mise au point rapide sans incidence sur la qualité d'image, et d'améliorer ainsi l'expérience de l'utilisateur.
PCT/CN2015/086686 2015-04-07 2015-08-11 Procédé et dispositif de mise au point automatique Ceased WO2016161734A1 (fr)

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