WO2015180509A1 - 一种图像获取终端和图像获取方法 - Google Patents

一种图像获取终端和图像获取方法 Download PDF

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Publication number
WO2015180509A1
WO2015180509A1 PCT/CN2015/072003 CN2015072003W WO2015180509A1 WO 2015180509 A1 WO2015180509 A1 WO 2015180509A1 CN 2015072003 W CN2015072003 W CN 2015072003W WO 2015180509 A1 WO2015180509 A1 WO 2015180509A1
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WIPO (PCT)
Prior art keywords
focus
camera module
point
image
end point
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PCT/CN2015/072003
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English (en)
French (fr)
Inventor
肖立锋
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宇龙计算机通信科技(深圳)有限公司
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Priority to EP15798733.0A priority Critical patent/EP3151536A4/en
Priority to US15/314,439 priority patent/US10511759B2/en
Publication of WO2015180509A1 publication Critical patent/WO2015180509A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/285—Systems for automatic generation of focusing signals including two or more different focus detection devices, e.g. both an active and a passive focus detecting device
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/45—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from two or more image sensors being of different type or operating in different modes, e.g. with a CMOS sensor for moving images in combination with a charge-coupled device [CCD] for still images
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/67—Focus control based on electronic image sensor signals
    • H04N23/673—Focus control based on electronic image sensor signals based on contrast or high frequency components of image signals, e.g. hill climbing method
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/90—Arrangement of cameras or camera modules, e.g. multiple cameras in TV studios or sports stadiums

Definitions

  • the present invention relates to the field of terminal photography, and in particular, to an image acquisition terminal and an image acquisition method capable of achieving fast focus.
  • Auto Focus is based on the principle of object light reflection.
  • the reflected light is received by the sensor (CCD) on the camera.
  • CCD sensor
  • Contrast method focuses by detecting the outline edge of the image to achieve autofocus.
  • the sharper the outline of the outline of the image the greater the gradient of its brightness, or the greater the contrast between the scene and the background at the edge.
  • out of focus images the edges of the outline are blurred, the brightness gradient or contrast is reduced; the farther out of focus, the lower the contrast.
  • the present invention provides an image acquisition terminal and an image acquisition method to solve the problem of slow focus speed existing in the prior art.
  • the present invention provides an image acquisition terminal and an image acquisition method.
  • An image acquisition terminal includes a first camera module, a second camera module, and a processing module, wherein the first camera module and the second camera module are configured to simultaneously framing the same scene, and detecting according to contrast of different frame images.
  • the focus search range includes a first focus area and a second focus area that are not coincident with each other, and the processing module is configured to control the first camera module to search for a focus point in the first focus area, and control the The second camera module searches for a focus point in the second focus area, and acquires the first camera module or the second camera module focus information, and is configured to control the first camera module to be in accordance with the focus information Focus gets the image.
  • the defined focus position is the first focus end point at the hyperfocal distance
  • the defined focus position is the second focus end point at the closest distance that can be focused
  • the defined focus position is the focus end point at half of the hyperfocal distance
  • the first A focus range between the focus end point and the focus end point is defined as a first focus area
  • a focus range between the second focus end point and the focus end point is defined as a second focus area.
  • the defined focus position is the first focus end point at the hyperfocal distance
  • the defined focus position is the second focus end point at the closest distance that can be focused
  • the defined focus position is the focus end point at half of the hyperfocal distance
  • the second A focus range between the focus end point and the focus end point is defined as a first focus area
  • a focus range between the first focus end point and the focus end point is defined as a second focus area.
  • the processing module when the processing module acquires the focus information of the first camera module, it is used to control the first camera module to be in focus and output an image.
  • the first camera module is configured to directly move the focus position to the focus point according to the focus information of the second camera module when the processing module acquires the focus information of the second camera module. .
  • the first camera module includes a first lens, a first driver, and a first image sensor.
  • the second camera module includes a second lens, a second driver, and a second image sensor, wherein the first driver is configured to drive the first lens to move toward the first image sensor to search for a focus point.
  • the second driver is configured to drive the second lens to move relative to the second image sensor to search for a focus point under the control of the processing module, and the processing module is configured according to a focus position of the second camera module Information that controls the first driver to directly drive the first lens to move to a focus position.
  • the processing module is further configured to determine a focus point of the search using the first camera module as a focus point of the first camera module when the first camera module and the second camera module simultaneously search for a focus point.
  • An image acquisition terminal includes a first camera module, a second camera module, and a processing module, wherein the first camera module and the second camera module are configured to simultaneously framing the same scene, and detecting according to contrast of different frame images.
  • the focus search range includes a first focus area and a second focus area that are not coincident with each other, and the processing module is configured to control the first camera module to search for a focus point in the first focus area, and control the The second camera module searches for a focus point in the second focus area, and the processing module is further configured to acquire a focus of the camera module that acquires the focus information in the first camera module and the second camera module.
  • An image acquisition method includes the steps of:
  • the first camera module when the focus information of the first camera module is acquired, the first camera module is controlled to be in a focus point and an image is output, and when the focus information of the second camera module is acquired, according to the The focus information of the two camera modules controls the first camera module to directly move the focus position to the focus point.
  • the image acquisition method provided by the technical solution adopts a first camera module and a second camera module to framing the same scene, and the first camera module adopts a high-resolution output image. Dividing the position range position of the focus search into two parts that do not coincide, while controlling the first camera module and the second camera module to simultaneously search the focus point, and according to the position information of the searched focus point, the first Phase The camera module is in focus to obtain a clear image, which can increase the speed of focusing compared to the high resolution output of the first camera module alone. Therefore, the image acquisition method provided by the technical solution can ensure high-resolution image output, can have a shorter focusing time, improve the speed of auto-focusing, and improve the user experience.
  • FIG. 1 is a structural block diagram of an image acquisition terminal according to an embodiment of the present disclosure
  • FIG. 2 is a flowchart of an image acquisition method provided by an embodiment of the present technical solution.
  • a first embodiment of the present invention provides an image acquisition terminal 100.
  • the image acquisition terminal 100 can be a smart device such as a mobile phone or a tablet computer.
  • the shooting involved in the present invention is not limited to photographing, video, etc., and the following is an example of photographing, and the video is chronologically ordering multiple photos.
  • the synthesis is performed, that is, the present invention is equally applicable to video shooting.
  • the image acquisition terminal 100 includes a first camera module 110, a second camera module 120, a processing module 130, and a display module 140.
  • the first camera module 110 and the second camera module 120 are configured to perform image sampling (such as photographing, recording video, etc.) on an external scene.
  • the first camera module 110 and the second camera module 120 may include the same lens, i.e., have the same optical coefficient, such as lenses employed having the same optical coefficient or the like.
  • the optical axes of the first camera module 110 and the second camera module 120 are parallel to each other, and the first image sensor 113 and the second image sensor 123 are located in the same direction perpendicular to the first camera module 110. In the plane.
  • the first camera module 110 is identical to the second camera module 120.
  • the first camera module 110 is configured to output a high resolution image
  • the second camera module 120 is configured to assist the first camera module 110 to perform focusing.
  • the second camera module 120 can also be used to acquire an image.
  • the first camera module 110 includes a first lens 111 and a first driver 112. And the first image sensor 113.
  • the first lens 111 may include one or more lenses for acquiring an optical image of a shooting scene.
  • the first image sensor 113 is configured to sense an optical image acquired by the first lens 113.
  • the first camera module 110 is configured to capture a scene and output a high resolution image sensed by the first image sensor 113. Specifically, the maximum resolution that the first camera module 110 can output is output, such as 20MP.
  • the first driver 112 is configured to drive the first lens 111 to move relative to the first image sensor 113 under the control of the processing module 130, thereby causing the first camera module 110 to implement auto focus.
  • the first driver 112 is a closed loop motor, and the first driver 112 can drive the first lens 111 to move, and can sense the position information of the movement and send it to the processing module 130.
  • the second camera module 120 includes a second lens 121 , a second driver 122 , and a second image sensor 123 .
  • the second lens 121 may also include one or more lenses for acquiring an optical image of the captured scene.
  • the second lens 121 and the first lens 111 may have the same structure and the same optical coefficient.
  • the second image sensor 123 is configured to sense an optical image acquired by the second lens 121.
  • the second camera module 120 and the first camera module 110 simultaneously capture the same scene, and output the image sensed by the second image sensor 123 with a lower resolution.
  • the image resolution output by the second image sensor 123 may be lower than the resolution of the image output by the first image sensor 113, and the image output by the second image sensor 123 may also be set.
  • the resolution is the same as the resolution of the image output by the first image sensor 113.
  • the second driver 122 is configured to drive the second lens 122 to move relative to the second image sensor 123 to achieve auto focus under the control of the processing module 130, and the second driver 122 is further configured to sense the location thereof. The location where the focus is located is sent to the processing module 130.
  • the second driver 122 is a closed-loop motor, and the closed-loop motor can not only drive the second lens 122 to move under the control of the processing module 130, but also can sense position information of the second lens 122 moving. And sent to the processing module 130.
  • the second image sensor 123 may be the same image sensor as the first image sensor 113, or may be an image having a physical resolution smaller than the physical resolution of the first image sensor 113. Sensor.
  • the driver drives the lens to move to achieve focus, and the driver drives the lens to move between the infinity and the closest focus distance.
  • the closest focusing distance refers to the shortest focusing distance when the lens can focus.
  • the focus position is defined
  • the search range is from infinity to the closest focusing distance.
  • the hyperfocal distances of different camera modules are also different. For example, an aperture value of F/2.2, 1/7 inch 2MP camera, can be defined as a hyperfocal distance position of about 80 cm, and the minimum focusing distance is 10 cm.
  • the focus position is defined as the first focus end point at 80cm.
  • the closest distance that the camera module can focus on is defined as the second focus endpoint. Therefore, the distance between the first focus end point and the second focus end point is the entire focus position range in which the focus search needs to be performed during the focusing process.
  • the focus position is defined as half of the hyperfocal distance as the focus end point.
  • the focus search position range of the first camera module 110 is between the first focus end point and the focus end point.
  • the focus search position range of the second camera module 120 is between the second focus end point and the focus end point.
  • the sum of the focus search position ranges of the first camera module 110 and the second camera module 120 is between the hyperfocal distance and the closest focus distance, and the focus search position range of the first camera module 110 and the focus of the second camera module 120
  • the search location ranges do not coincide. It can be understood that the focus position range of the first camera module 110 can also be set to be between the second focus end point and the focus end point.
  • the focus position range of the second camera module 120 is between the first focus end point and the focus end point.
  • the determining method of the focus end point is not limited to the determining method of the embodiment, and a certain point between the first focus end point and the second focus end point may be determined as a focus end point as needed, so as to be able to
  • the entire focus position range may be divided into two segments that do not overlap each other. That is, the entire focus search position range is divided into the first focus area and the second focus area that do not coincide with each other, so that the first camera module 110 and the second camera module 120 respectively search for the focus position in one focus area.
  • the first focus area may be a focus area between the first focus end point and the focus end point
  • the second focus area may be a focus area between the second focus end point and the focus end point.
  • the first focus area may also be a focus area between the second focus end point and the focus end point
  • the second focus area may be a focus area between the first focus end point and the focus end point.
  • the determination of the first focus end point and the second focus end point may also adopt other methods, such as directly setting the lens and two points at infinity as two focus end points, as long as the closest focus distance is The hyperfocal distance is located between the two focus endpoints.
  • the physical resolutions of the first image sensor 113 and the second image sensor 123 may be the same or different.
  • the physical resolution is the maximum resolution that the image sensor can output.
  • the position of the focus point of the second camera module 120 is the same as the position of the focus point of the first camera module 110. That is, when the focus is on the focus, the distance between the first lens 111 and the first image sensor 113 is equal to the distance between the second lens 121 and the second image sensor 123.
  • the second camera may be determined by detecting when the first camera module 110 and the second camera module 120 are fabricated. Each of the focus points of the module 120 corresponds to a focus point of the first camera module 110. For the same shooting scene, when the second lens 121 of the second camera module 120 is in the focus A position, it is determined by the test that the first lens 111 of the first camera module 110 is at the B position, thereby the A position and A correspondence is formed between the B positions.
  • the processing module 130 is configured to control the first camera module 110 and the second camera module 120 to simultaneously framing the shooting scene, and control the first camera module 110 to search for a focus position in the first focus area, and control The second camera module 120 searches for a focus position in the second focus area. After the first camera module 110 or the second camera module 120 searches for the focus position, the first camera module 110 is controlled according to the determined focus position. Focus on and output the image.
  • the processing module 130 includes a framing control unit 131, a first focusing unit 132, a second focusing unit 133, a focus point determining unit 134, and an image acquiring unit 135.
  • the framing control unit 131 is configured to control the first camera module 110 and the second camera module 120 to simultaneously framing the same scene.
  • the first focusing unit 132 is configured to control the first camera module 110 to search for a focus position from the first focus end point to the focus end point.
  • the first focusing unit 132 can achieve focusing according to a method of contrast detection. Specifically, the first focusing unit 132 controls the first driver 112 to move, so that the focus position to the first focus end point moves to the focus end point to search for the focus position.
  • the first focus unit 132 analyzes the image contrast of different frames sensed by the first image sensor 113. When the clearest frame image is obtained, the contrast value of the frame image is the largest, so that the focus position corresponding to the frame image That is, the focus point, the first driver 112 can also sense the position information of the focus point.
  • the second focusing unit 133 is configured to control the second camera module 120 to search for a focus position from the second focus end point to the focus end point.
  • the second focusing unit 133 can be based on contrast The method of detection achieves focus.
  • the second focusing unit 133 controls the second driver 122 to move, so that the focus position to the second focus end point moves to the focus end point to search for the focus position.
  • the second focus unit 133 analyzes the image contrast of different frames sensed by the second image sensor 123. When the clearest frame image is obtained, the contrast value of the frame image is the largest, so that the focus position corresponding to the frame image That is, the focus point, the second driver 122 senses the position information of the focus point.
  • the focus determining unit 134 is configured to receive the focus position information sent by the first focusing unit 132 or the second focusing unit 133, and according to the focus position information, the first camera module 110 is in a focus point.
  • the first camera module 110 is kept at the focus point.
  • the focus determination unit 134 receives the focus information transmitted by the second focus unit 133
  • the direct movement of the first camera module 110 to the pair is controlled according to the focus information of the second focus unit 133. focus.
  • the first driver 112 is controlled to drive the first lens 111 to move to a focus position, so that the first camera module 110 can directly acquire a clear image.
  • the second focusing unit 133 may determine the first camera module 110 according to the focus position information of the second camera module 120. The focus position, thereby directly controlling the first driver 112 to drive the first lens 111 to move to the focus point to achieve auto focus.
  • the second camera module 120 The position of the focus point is the same as the position of the focus point of the first camera module 110.
  • the distance between the first lens 111 and the first image sensor 113 is equal to the distance between the second lens 121 and the second image sensor 123.
  • the relationship data corresponding to the focus point of the first camera module 110 corresponding to each focus point of the second camera module 120 is obtained. The focus point of the first camera module 110 is determined.
  • the image acquisition module 135 is configured to acquire an image when the focus position of the first camera module 110 is.
  • the first image sensor 113 outputs with high resolution, and the image acquired by the image acquisition unit 135 has high resolution.
  • the second focusing unit 133 controls the second camera module 120 to also perform focusing.
  • the focus point determining unit 134 is further configured to determine that the focus point of the first camera module 110 is used.
  • the focus point obtained by the camera module that acquires the image is taken as the standard, because it is no longer necessary to control the first camera module 110 to focus according to the focus point acquired by the second camera module 120, thereby reducing the focusing time and avoiding image shake.
  • control module 130 may also control the second camera module. 120 Shoots at the focus position to acquire an image.
  • the display module 140 can be used to display an image acquired by the image acquisition unit 135.
  • the image acquisition terminal 100 may further include a storage element for storing an image acquired by the image acquisition unit 135.
  • the processing module 130 may further include a compensation module, configured to adjust an image output by the second camera module 120 according to a distance between the first camera module 110 and the second camera module 120, to The image output by the second camera module 120 is made to coincide with the image output by the first camera module 110.
  • the image acquisition terminal 100 provided by the technical solution includes a first camera module 110 and a second camera module 120, and the first camera module 110 adopts a high resolution output image.
  • the position range position of the focus search is divided into two portions that are not coincident, while the first camera module 110 and the second camera module 120 are controlled to simultaneously perform the focus point.
  • Searching, and according to the position information of the searched focus point the first camera module 110 is in the focus point to obtain a clear image, and the autofocus is performed by using the high-resolution output of the first camera module 110 alone, which can improve the focus. speed. Therefore, the image acquisition terminal 100 provided by the present technical solution can ensure high-resolution image output, can have a shorter focusing time, improve the speed of auto-focusing, and improve the user experience.
  • the technical solution further provides an image acquisition method, and the image acquisition method may adopt the present
  • the image acquisition terminal provided by the technical solution embodiment is completed, and the image acquisition method includes the following steps:
  • the processing module 130 is used to control the first camera module 110 and the second camera module 120 to simultaneously framing the same scene.
  • the optical axes of the first camera module 110 and the second camera module 120 are parallel to each other, and the first image sensor 113 and the second image sensor 123 are located in the same direction perpendicular to the first camera module 110. In the plane.
  • the optical characteristics of the first lens 111 of the first image module 110 and the second lens 121 of the second camera module 120 are the same.
  • S102 Simultaneously control the first camera module 110 and the second camera module 120 to search for a focus point in a focus search range that does not coincide with each other, and acquire position information of a focus point of the first camera module 110 or the second camera module 120.
  • the first camera module 110 is controlled to search for a focus position within the first focus area.
  • the second camera module 120 is controlled to search for a focus position in the second focus area.
  • the first focusing unit 132 can achieve focusing according to a method of contrast detection. Specifically, in the embodiment, the first focusing unit 132 controls the first driver 112 to drive the first lens 111 to move, so that the focus position to the first focus end point moves to the focus end point to search for the focus point. position.
  • the first focus unit 132 analyzes the image contrast of different frames sensed by the first image sensor 113.
  • the first driver 112 can also sense the position information in the focus point and send the position information to the processing unit 130.
  • the second focusing unit 133 can achieve focusing according to a method of contrast detection. Specifically, the second focusing unit 133 controls the second driver 122 to drive the second lens 121 to move, so that the focus position to the second focus end point moves to the focus end point to search for the focus position.
  • the second focus unit 133 analyzes the image contrast of different frames sensed by the second image sensor 123.
  • the contrast value of the frame image is the largest, so that the focus position corresponding to the frame image That is, the focus point, the second driver 122 senses the position information at the focus point and transmits the position information to the processing module 130.
  • the first camera module 110 and the second camera module 120 can search for the focus position, and therefore, generally only one focus position information can be acquired. Since the first focusing unit 132 controls the first camera module 110 to perform focusing, the second focusing unit 133 controls the second camera module 120 to also focus. When the focus point is located near the end point of the focus, since the focus position at which the sharp image is obtained is not unique, there may be a phenomenon in which the first camera module 110 and the second camera module 120 simultaneously find the focus point. Therefore, when the first camera module 110 and the second camera module 120 simultaneously find the focus point, the focus information of the first camera module 110 is employed.
  • the first camera module 110 may be kept to stop the focus search for image acquisition, and the second camera module 120 may also stop the focus search at the same time.
  • the second focusing unit 133 of the processing module 130 is configured according to the focus position information sent by the second driver 122 according to the second camera module 120. Focusing on the correspondence between the focus information and the focus of the first camera module 110 and the second camera module 120, controlling the first driver 112 to drive the first lens 111 to move to a focus position, thereby causing the first camera Module 110 can directly capture clear images.
  • the first camera module 110 outputs with high resolution, it is ensured that the resolution of the output image satisfies the requirements.
  • the image acquisition method provided by the present technical solution uses the first camera module 110 and the second camera module 120 to framing the same scene, and the first camera module 110 adopts a high-resolution output image. Dividing the position range position of the focus search into two parts that do not coincide, while controlling the first camera module 110 and the second camera module 120 to simultaneously perform the search of the focus point, and according to the position information of the searched focus point, The first camera module 110 is in the focus point to obtain a clear image, and the autofocusing using the high resolution output of the first camera module 110 alone can improve the speed of focusing. Therefore, the image acquisition method provided by the technical solution can ensure high-resolution image output, can have a shorter focusing time, improve the speed of auto-focusing, and improve the user experience.

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  • Physics & Mathematics (AREA)
  • Multimedia (AREA)
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  • Computer Vision & Pattern Recognition (AREA)
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Abstract

本发明提供了一种图像获取终端，其包括第一相机模块、第二相机模块及处理模块，所述第一相机模块和第二相机模块用于同时对同一场景进行取景，根据不同帧图像的对比度进行检测及分析，对焦点搜索范围包括互不重合的第一对焦区域和第二对焦区域，所述处理模块用于控制所述第一相机模块在所述第一对焦区域内搜索对焦点，同时控制所述第二相机模块在所述第二对焦区域内搜索对焦点，并获取所述第一相机模块或第二相机模块对焦点信息，并用于根据所述对焦点信息控制所述第一相机模块处于对焦点获取图像。本发明还对应提供一种图像获取方法。本发明能够解决现有单镜头图像获取模块采用高分辨率输出图像对焦慢的问题。

Description

一种图像获取终端和图像获取方法
本申请要求于2014年05月29日提交中国专利局、申请号为201410236100.4，发明名称为“一种图像获取终端和图像获取方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及终端拍摄领域，尤其涉及一种能够实现快速对焦的图像获取终端及图像获取方法。
背景技术
自动对焦(Auto Focus)是利用物体光反射的原理，将反射的光被相机上的传感器(CCD)接受，通过计算机处理，带动电动对焦装置进行对焦的方式叫自动对焦。对比度法进行对焦是通过检测图像的轮廓边缘实现自动对焦的。图像的轮廓边缘越清晰，则它的亮度梯度就越大，或者说边缘处景物和背景之间的对比度就越大。反之，失焦的图像，轮廓边缘模糊不清，亮度梯度或对比度下降；失焦越远，对比度越低。
现有的单摄像头对焦系统，自动对焦依靠音圈马达(VCM)逐步从初始焦点移动到远焦点，在不同帧之间对对焦窗口区域数据进行比较，找到最清晰的点，完成对焦过程。但目前手机终端摄像头分辨率不断提高情况下，一般在预览时即已使用全分辨率输出，达到零延时功能，因此帧率比较低，如现有分辨率为20MP摄像头，其全分辨率输出时帧率只有12fps。并且在低照度环境下，一般处理是降低帧率达到更高的图像亮度及降低噪点，因此，现有的帧检测对比度算法在单摄像头全分辨率预览及低光环境下性能较差，对焦时间长，对焦的速度慢，影响用户体验。
因此，如何提供一种能够实现快速对焦的图像获取终端及图像获取方法，是本领域技术人员亟待解决的技术问题。
发明内容
本发明提供了一种图像获取终端及图像获取方法，以解决现有技术存在的对焦速度慢的问题。
为了实现上述目的，本发明提供图像获取终端及图像获取方法。
一种图像获取终端，其包括第一相机模块、第二相机模块及处理模块，所述第一相机模块和第二相机模块用于同时对同一场景进行取景，根据不同帧图像的对比度进行检测及分析，对焦点搜索范围包括互不重合的第一对焦区域和第二对焦区域，所述处理模块用于控制所述第一相机模块在所述第一对焦区域内搜索对焦点，同时控制所述第二相机模块在所述第二对焦区域内搜索对焦点，并获取所述第一相机模块或第二相机模块对焦点信息，并用于根据所述对焦点信息控制所述第一相机模块处于对焦点获取图像。
其中，定义对焦位置在超焦距离处为第一对焦端点，定义对焦位置在能够对焦的最近距离处为第二对焦端点，定义对焦位置在超焦距离的一半处为对焦终点，所述第一对焦端点与所述对焦终点之间的对焦范围定义为第一对焦区域，所述第二对焦端点与所述对焦终点之间的对焦范围定义为第二对焦区域。
其中，定义对焦位置在超焦距离处为第一对焦端点，定义对焦位置在能够对焦的最近距离处为第二对焦端点，定义对焦位置在超焦距离的一半处为对焦终点，所述第二对焦端点与所述对焦终点之间的对焦范围定义为第一对焦区域，所述第一对焦端点与所述对焦终点之间的对焦范围定义为第二对焦区域。
其中，当所述处理模块获取到所述第一相机模块的对焦点信息时，用于控制所述第一相机模块处于对焦点并输出图像。
其中，当所述处理模块获取到所述第二相机模块的对焦点信息时，用于根据所述第二相机模块的对焦点信息，控制所述第一相机模块直接将对焦位置移动至对焦点。
其中，所述第一相机模块包括第一镜头、第一驱动器及第一影像感测器， 所述第二相机模块包括第二镜头、第二驱动器及第二影像感测器，所述第一驱动器用于驱动所述第一镜头向对第一影像感测器移动以搜索对焦点，所述第二驱动器用于在所述处理模块的控制下驱动所述第二镜头相对所述第二影像感测器移动以搜索对焦点，所述处理模块根据所述第二相机模块的对焦点位置信息，控制所述第一驱动器直接驱动所述第一镜片移动至对焦点位置。
其中，当所述第一相机模块和第二相机模块同时搜索到对焦点时，所述处理模块还用于判定采用第一相机模块的搜索的对焦点作为第一相机模块的对焦点。
一种图像获取终端，其包括第一相机模块、第二相机模块及处理模块，所述第一相机模块和第二相机模块用于同时对同一场景进行取景，根据不同帧图像的对比度进行检测及分析，对焦点搜索范围包括互不重合的第一对焦区域和第二对焦区域，所述处理模块用于控制所述第一相机模块在所述第一对焦区域内搜索对焦点，同时控制所述第二相机模块在所述第二对焦区域内搜索对焦点，所述处理模块还用于在获取所述第一相机模块和第二相机模块先获取对焦点信息的相机模块处于对焦点获取图像。
一种图像获取方法，包括步骤:
控制所述第一相机模块和第二相机模块同时对同一场景进行取景
同时控制所述第一相机模块和第二相机模块分别在互不重合的对焦点搜索范围内搜索对焦点，获取第一相机模块或第二相机模块对焦点的位置信息；
根据获取的所述对焦点信息，确定所述第一相机模块的对应对焦点；以及
控制所述第一相机模块位于对焦点获取图像。
其中，当获取到所述第一相机模块的对焦点信息时，控制所述第一相机模块处于对焦点并输出图像，当获取到所述第二相机模块的对焦点信息时，根据所述第二相机模块的对焦点信息，控制所述第一相机模块直接将对焦位置移动至对焦点。
本技术方案提供的图像获取方法，其采用第一相机模块和第二相机模块对同一场景进行取景，所述第一相机模块采用高分辨率输出图像。将对焦点搜索的位置范围位置分割为不相重合的两个部分，同时控制第一相机模块和第二相机模块同时进行对焦点的搜索，并根据搜索到的对焦点的位置信息，将第一相 机模块处于对焦点以获得清晰图像，相比于单独第一相机模块采用高分辨率输出进行自动对焦，可以提高对焦的速度。因此，本技术方案提供的图像获取方法，能够保证高分辨率的图像输出的同时，可以具有较短的对焦时间，提高自动对焦的速度，提升用户的使用体验。
附图说明
图1为本技术方案实施方式提供的图像获取终端的结构框图；
图2为本技术方案的实施方式提供的图像获取方法的流程图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用于解释本发明，并不用于限定本发明。
请参阅图1，本发明的第一实施方式提供一种图像获取终端100。所述图像获取终端100可以为手机、平板电脑等智能设备，本发明所涉及的拍摄不局限于拍照、视频等等，下文以拍照为例进行说明，视频等则是将多张照片按照时间顺序进行合成，也即是本发明同样适用于视频拍摄。
所述图像获取终端100包括第一相机模块110、第二相机模块120、处理模块130及显示模块140。
所述第一相机模块110和第二相机模块120用于对外部场景进行图像采样(如拍照、录视频等)。所述第一相机模块110和第二相机模块120可以包括相同的镜头，即具有相同光学系数，如采用的镜片具有相同的光学系数等。优选地，所述第一相机模块110和第二相机模块120的光轴相互平行，且所述第一影像感测器113和第二影像感测器123位于垂直于第一相机模块110的同一平面内。优选地，所述第一相机模块110与第二相机模块120相同。所述第一相机模块110用于输出高分辨率图像，所述第二相机模块120用于辅助所述第一相机模块110进行对焦。当然，所述第二相机模组120也可以用于获取图像。
本实施方式中，所述第一相机模块110包括第一镜头111、第一驱动器112 及第一影像感测器113。所述第一镜头111可以包括一个或者多个镜片，用于获取拍摄场景的光学图像。所述第一影像感测器113用于感测所述第一镜头113获取的光学图像。所述第一相机模块110用于对场景进行拍摄，并将第一影像感测器113感测到的图像高分辨率进行输出。具体的，可以采用所述第一相机模块110能够输出的最大分辨率进行输出，如20MP。所述第一驱动器112用于在处理模块130的控制下驱动所述第一镜头111相对所述第一影像感测器113进行移动，从而使得第一相机模块110实现自动对焦。所述第一驱动器112为闭环式马达，所述第一驱动器112可以驱动第一镜头111移动，并可以感测移动的位置信息，并发送至处理模块130。
所述第二相机模块120包括第二镜头121、第二驱动器122及第二影像感测器123。所述第二镜头121也可以包括一个或者多个镜片，用于获取拍摄场景的光学图像。所述第二镜头121与第一镜头111可以结构相同，且光学系数也相同。所述第二影像感测器123用于感测所述第二镜头121获取的光学图像。所述第二相机模块120与第一相机模块110同时对相同的场景进行拍摄，并将所述第二影像感测器123感测到的图像采用较低的分辨率进行输出。具体的，可以设置第二影像感测器123输出的图像分辨率低于所述第一影像感测器113输出的图像的分辨率，也可以设置所述第二影像感测器123输出图像的分辨率与第一影像感测器113输出的图像的分辨率相同。所述第二驱动器122用于在处理模块130的控制下驱动第二镜片122相对第二影像感测器123移动以实现自动对焦，所述第二驱动器122还用于感测其所在的位置，并将其对焦所在的位置发送至处理模块130。所述第二驱动器122为闭环式马达，所述闭环式马达不但可以在所述处理模块130的控制下驱动所述第二镜片122移动，并且可以感测所述第二镜头122移动的位置信息，并发送至所述处理模块130。所述第二影像感测器123可以是与第一影像感测器113分辨率相同的影像感测器，也可以是物理分辨率小于所述第一影像感测器113的物理分辨率的影像感测器。
在相机模块中，驱动器驱动镜片移动以实现对焦，驱动器驱动镜片移动的过程中，使得相机模块的对焦位置在无穷远处至最近对焦距离之间。最近对焦距离指的是镜头能够合焦时的最短的对焦距离。本实施方式中，定义对焦位置 搜索范围为无穷远处至最近的对焦距离。为了在实际操作方便，可以将对焦位置搜索范围设置为超焦距处(Hyperfocal Distance)至最近对焦距离处。根据景深的不同，不同相机模块的超焦距离也不同，如一枚光圈值为F/2.2，1/7英寸2MP摄像头，在80cm左右可定义为超焦距离位置，最小对焦距离为10cm。对应此相机模块，可以设置将对焦位置在80cm定义为第一对焦端点。相机模块能够对焦的最近距离定义为第二对焦端点。因此，第一对焦端点与第二对焦端点之间的距离为对焦过程中需要进行对焦搜索的全部对焦位置范围。本实施方式中，定义对焦位置为超焦距离的一半为对焦终点。本实施方式中，所述第一相机模块110的对焦搜索位置范围为第一对焦端点与对焦终点之间。所述第二相机模块120的对焦搜索位置范围为第二对焦端点与对焦终点之间。即第一相机模块110和第二相机模块120的对焦搜索位置范围之和为超焦距离至最近的对焦距离之间，且第一相机模块110的对焦搜索位置范围与第二相机模块120的对焦搜索位置范围并不重合。可以理解的是，也可以设置所述第一相机模块110的对焦位置范围为第二对焦端点与对焦终点之间。所述第二相机模块120的对焦位置范围为第一对焦端点与对焦终点之间。
可以理解的是，所述对焦终点的确定方法不限于本实施方式的确定方法，也可以根据需要，确定所述第一对焦端点和第二对焦端点之间的某一点为对焦终点，以能够将所述全部对焦位置范围分割为互不重合的两段即可。也就是说，将全部对焦搜索位置范围分割为互不重合的第一对焦区域和第二对焦区域，使得所述第一相机模块110和第二相机模块120分别在一个对焦区域内搜索对焦点位置。所述第一对焦区域可以为第一对焦端点与对焦终点之间的对焦区域，所述第二对焦区域可以为第二对焦端点与对焦终点之间的对焦区域。可以理解的是，所述第一对焦区域也可以为第二对焦端点与对焦终点之间的对焦区域，所述第二对焦区域可以为第一对焦端点与对焦终点之间的对焦区域。
可以理解的是，所述第一对焦端点和第二对焦端点的确定也可以采用其他方法，如直接设定镜头与无穷远处的两个点定义为两个对焦端点，只要最近对焦距离处及超焦距处均位于两个对焦端点之间即可。
所述第一影像感测器113和第二影像感测器123的物理分辨率可以相同，也可以不同。所述物理分辨率为影像感测器能够输出的最大分辨率。当所述第 一影像感测器113和第二影像感测器123的物理分辨率相同，且所述第一镜头111和所述第二镜头121相同时，即第一相机模块110与第二相机模块相同时，所述第二相机模块120的对焦点的位置与所述第一相机模块110的对焦点的位置相同。即当位于对焦点时，所述第一镜头111与第一影像感测器113之间的距离与第二镜头121与第二影像感测器123之间的距离相等。当所述第一影像感测器113和第二影像感测器123的物理分辨率不相同，可以在制作第一相机模块110和第二相机模块120时，通过检测的方式，确定第二相机模块120的每个对焦点对应的与第一相机模块110的对焦点。如对于同一拍摄场景，当第二相机模块120的第二镜片121处于对焦点A位置时，通过测试得出此时第一相机模块110的第一镜片111对应处于B位置，从而将A位置与B位置之间形成对应关系。
所述处理模块130用于控制所述第一相机模块110和第二相机模块120同时对所述拍摄场景进行取景，控制所述第一相机模块110在第一对焦区域内搜索对焦点位置，控制所述第二相机模块120在第二对焦区域内搜索对焦点位置，当第一相机模块110或第二相机模块120搜索到对焦点位置后，根据确定的对焦点位置，控制第一相机模块110处于对焦点并输出图像。
所述处理模块130包括取景控制单元131、第一对焦单元132、第二对焦单元133、对焦点确定单元134及图像获取单元135。
所述取景控制单元131用于控制所述第一相机模块110和第二相机模块120同时对相同场景进行取景。
本实施方式中，所述第一对焦单元132用于控制所述第一相机模块110自所述第一对焦端点向对焦终点搜索对焦点位置。所述第一对焦单元132可以根据对比度检测的方法实现对焦。具体的，所述第一对焦单元132控制所述第一驱动器112移动，使得对焦位置至所述第一对焦端点向对焦终点移动，以搜索对焦点位置。所述第一对焦单元132对第一影像感测器113感测到的不同帧的图像对比度分析，当得到最清晰的帧图像时，帧图像的对比度值最大，从而该帧图像对应的对焦位置即为对焦点，所述第一驱动器112还可以感测对焦点的位置信息。所述第二对焦单元133用于控制所述第二相机模块120自所述第二对焦端点向对焦终点搜索对焦点位置。所述第二对焦单元133可以根据对比度 检测的方法实现对焦。具体的，所述第二对焦单元133控制所述第二驱动器122移动，使得对焦位置至所述第二对焦端点向对焦终点移动，以搜索对焦点位置。所述第二对焦单元133对第二影像感测器123感测到的不同帧的图像对比度分析，当得到最清晰的帧图像时，帧图像的对比度值最大，从而该帧图像对应的对焦位置即为对焦点，所述第二驱动器122感测对焦点的位置信息。
对焦点确定单元134用于接收所述第一对焦单元132或第二对焦单元133发送的对焦点位置信息，并根据所述对焦点位置信息，将所述第一相机模块110处于对焦点。
当对焦点确定单元134接收到的为第一对焦单元132发送的对焦点信息时，则保持所述第一相机模块110处于所述对焦点。当所述对焦确定单元134接收到的为第二对焦单元133发送的对焦点信息时，则根据所述第二对焦单元133的对焦点信息，控制所述第一相机模块110的直接移动至对焦点。具体的，控制所述第一驱动器112驱动所述第一镜片111对应移动至对焦点位置，从而使得所述第一相机模块110直接可以获取清晰图像。由于所述第一相机模块110和第二相机模块120的对焦点之间存在对应关系，所述第二对焦单元133根据第二相机模块120的对焦点位置信息，可以确定第一相机模块110的对焦点位置，从而直接控制所述第一驱动器112驱动所述第一镜片111移动至对焦点，实现自动对焦。
当所述第一影像感测器113和第二影像感测器123的物理分辨率相同时，且所述第一镜头111和所述第二镜头121相同时，所述第二相机模块120的对焦点的位置与所述第一相机模块110的对焦点的位置相同。当位于对焦点时，所述第一镜头111与第一影像感测器113之间的距离与第二镜头121与第二影像感测器123之间的距离相等。当所述第一影像感测器113和第二影像感测器123的物理分辨率不相同，根据第二相机模块120的每个对焦点对应的与第一相机模块110的对焦点的关系数据，确定第一相机模块110的对焦点。
图像获取模块135用于获取所述第一相机模块110的对焦点位置时的图像。所述第一影像感测器113采用高分辨率进行输出，所述图像获取单元135获取的图像具有高的分辨率。
可以理解的是，由于所述第一对焦单元132控制第一相机模块110进行对 焦的同时，所述第二对焦单元133控制所述第二相机模块120也进行对焦。当对焦点位于所述对焦终点附近时，由于获得清晰图像的对焦点位置并不唯一，可能存在第一相机模块110和第二相机模块120同时找到对焦点的现象。因此，当第一相机模块110和第二相机模块120同时找到对焦点时，所述对焦点确定单元134还用于判定采用第一相机模块110的对焦点为准。即采用获取图像的相机模块获取的对焦点为准，因为这样可以不必再控制第一相机模块110根据第二相机模块120获取的对焦点进行对焦，减少对焦的时间，避免图像抖动。
可以理解的是，在一些对于获取的图像的分辨率要求不高的情况下，当所述第二相机模块120先搜索到对焦点时，所述控制模块130也可以控制所述第二相机模块120在对焦点位置进行拍摄，获取图像。
所述显示模块140可以用于显示所述图像获取单元135获取的图像。
进一步的，所述图像获取终端100还可以进一步包括存储元件，用于存储所述图像获取单元135获取的图像。
可以理解的是，所述第一相机模块110和第二相机模块120设置的位置之间具有距离，可能会导致所述第一相机模块110和第二相机模块120获取的图像会存在位置的偏差。所述处理模块130还可以进一步包括补偿模块，所述补偿模块用于根据所述第一相机模块110和第二相机模块120之间的距离，对第二相机模块120输出的图像进行调整，以使得所述第二相机模块120输出的图像与第一相机模块110输出的图像一致。
本技术方案提供的图像获取终端100，其包括第一相机模块110和第二相机模块120，所述第一相机模块110采用高分辨率输出图像。当采用帧差异为基础的对比度检测来实现自动对焦时，将对焦点搜索的位置范围位置分割为不相重合的两个部分，同时控制第一相机模块110和第二相机模块120同时进行对焦点的搜索，并根据搜索到的对焦点的位置信息，将第一相机模块110处于对焦点以获得清晰图像，相比于单独第一相机模块110采用高分辨率输出进行自动对焦，可以提高对焦的速度。因此，本技术方案提供的图像获取终端100，能够保证高分辨率的图像输出的同时，可以具有较短的对焦时间，提高自动对焦的速度，提升用户的使用体验。
本技术方案还对应提供一种图像获取方法，所述图像获取方法可以采用本 技术方案实施方式提供的图像获取终端完成，所述图像获取方法包括步骤：
S101，控制所述第一相机模块110和第二相机模块120同时对同一场景进行取景。
采用处理模块130控制所述第一相机模块110和第二相机模块120同时对同一场景进行取景。优选地，所述第一相机模块110和第二相机模块120的光轴相互平行，且所述第一影像感测器113和第二影像感测器123位于垂直于第一相机模块110的同一平面内。所述第一图像模块110的第一镜头111与第二相机模块120的第二镜头121的光学系数相同。
S102，同时控制所述第一相机模块110和第二相机模块120分别在互不重合的对焦点搜索范围内搜索对焦点，获取第一相机模块110或第二相机模块120对焦点的位置信息。
控制所述第一相机模块110在第一对焦区域内搜索对焦点位置。同时控制所述第二相机模块120在第二对焦区域内搜索对焦点位置。所述第一对焦单元132可以根据对比度检测的方法实现对焦。具体的，本实施方式中，所述第一对焦单元132控制所述第一驱动器112驱动所述第一镜片111移动，使得对焦位置至所述第一对焦端点向对焦终点移动，以搜索对焦点位置。所述第一对焦单元132对第一影像感测器113感测到的不同帧的图像对比度分析，当得到最清晰的帧图像时，帧图像的对比度值最大，从而该帧图像对应的对焦位置即为对焦点，所述第一驱动器112还可以感测处于对焦点的位置信息，并将所述位置信息发送至处理单元130。所述第二对焦单元133可以根据对比度检测的方法实现对焦。具体的，所述第二对焦单元133控制所述第二驱动器122驱动所述第二镜片121移动，使得对焦位置至所述第二对焦端点向对焦终点移动，以搜索对焦点位置。所述第二对焦单元133对第二影像感测器123感测到的不同帧的图像对比度分析，当得到最清晰的帧图像时，帧图像的对比度值最大，从而该帧图像对应的对焦位置即为对焦点，所述第二驱动器122感测处于对焦点的位置信息，并将位置信息发送至处理模块130。
在通常情况下，所述第一相机模块110和第二相机模块120中仅有一个能够搜索到对焦点位置，因此，一般仅能获取一个对焦点位置信息。由于所述第一对焦单元132控制第一相机模块110进行对焦的同时，所述第二对焦单元 133控制所述第二相机模块120也进行对焦。当对焦点位于所述对焦终点附近时，由于获得清晰图像的对焦点位置并不唯一，可能存在第一相机模块110和第二相机模块120同时找到对焦点的现象。因此，当第一相机模块110和第二相机模块120同时找到对焦点时，则采用第一相机模块110的对焦点信息。
S103，根据获取的所述对焦点信息，确定所述第一相机模块110的对焦点。
当获取的对焦点信息为所述第一相机模块110获取时，则可以保持所述第一相机模块110停止对焦搜索，以进行图像获取，所述第二相机模块120也可以同时停止对焦搜索。
当获取的对焦点信息为所述第二相机模块120获取时，则所述处理模块130的第二对焦单元133根据所述第二驱动器122发送的对焦点位置信息，根据第二相机模块120的对焦点信息及第一相机模块110与第二相机模块120的对焦点的对应关系，控制所述第一驱动器112驱动所述第一镜片111对应移动至对焦点位置，从而使得所述第一相机模块110直接可以获取清晰图像。
S104，控制所述第一相机模块110位于对焦点获取图像。
由于第一相机模块110采用高分辨率进行输出，从而可以保证输出的图像的分辨率满足要求。
可以理解的是，当使用者更换拍摄场景时，仅需重复步骤S102至S104，即可获得不同场景的高分辨率图像。
本技术方案提供的图像获取方法，其采用第一相机模块110和第二相机模块120对同一场景进行取景，所述第一相机模块110采用高分辨率输出图像。将对焦点搜索的位置范围位置分割为不相重合的两个部分，同时控制第一相机模块110和第二相机模块120同时进行对焦点的搜索，并根据搜索到的对焦点的位置信息，将第一相机模块110处于对焦点以获得清晰图像，相比于单独第一相机模块110采用高分辨率输出进行自动对焦，可以提高对焦的速度。因此，本技术方案提供的图像获取方法，能够保证高分辨率的图像输出的同时，可以具有较短的对焦时间，提高自动对焦的速度，提升用户的使用体验。
当然，本发明还可有其它多种实施例，在不背离本发明精神及其实质的情况下，熟悉本领域的技术人员当可根据本发明作出各种相应的改变和变形，但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。

Claims (10)

  1. 一种图像获取终端，其包括第一相机模块、第二相机模块及处理模块，所述第一相机模块和第二相机模块用于同时对同一场景进行取景，根据不同帧图像的对比度进行检测及分析，对焦点搜索范围包括互不重合的第一对焦区域和第二对焦区域，所述处理模块用于控制所述第一相机模块在所述第一对焦区域内搜索对焦点，同时控制所述第二相机模块在所述第二对焦区域内搜索对焦点，并获取所述第一相机模块或第二相机模块对焦点信息，并用于根据所述对焦点信息控制所述第一相机模块处于对焦点获取图像。
  2. 如权利要求1所述的图像获取终端，其特征在于，定义对焦位置在超焦距离处为第一对焦端点，定义对焦位置在能够对焦的最近距离处为第二对焦端点，定义对焦位置在超焦距离的一半处为对焦终点，所述第一对焦端点与所述对焦终点之间的对焦范围定义为第一对焦区域，所述第二对焦端点与所述对焦终点之间的对焦范围定义为第二对焦区域。
  3. 如权利要求1所述的图像获取终端，其特征在于，定义对焦位置在超焦距离处为第一对焦端点，定义对焦位置在能够对焦的最近距离处为第二对焦端点，定义对焦位置在超焦距离的一半处为对焦终点，所述第二对焦端点与所述对焦终点之间的对焦范围定义为第一对焦区域，所述第一对焦端点与所述对焦终点之间的对焦范围定义为第二对焦区域。
  4. 如权利要求1所述的图像获取终端，其特征在于，当所述处理模块获取到所述第一相机模块的对焦点信息时，用于控制所述第一相机模块处于对焦点并输出图像。
  5. 如权利要求1所述的图像获取终端，其特征在于，当所述处理模块获取到所述第二相机模块的对焦点信息时，用于根据所述第二相机模块的对焦点信息，控制所述第一相机模块直接将对焦位置移动至对焦点。
  6. 如权利要求5所述的图像获取终端，其特征在于，所述第一相机模块包括第一镜头、第一驱动器及第一影像感测器，所述第二相机模块包括第二镜头、第二驱动器及第二影像感测器，所述第一驱动器用于驱动所述第一镜头向对第一影像感测器移动以搜索对焦点，所述第二驱动器用于在所述处理模块的控制 下驱动所述第二镜头相对所述第二影像感测器移动以搜索对焦点，所述处理模块根据所述第二相机模块的对焦点位置信息，控制所述第一驱动器直接驱动所述第一镜片移动至对焦点位置。
  7. 如权利要求1所述的图像获取终端，其特征在于，当所述第一相机模块和第二相机模块同时搜索到对焦点时，所述处理模块还用于判定采用第一相机模块的搜索的对焦点作为第一相机模块的对焦点。
  8. 一种图像获取终端，其包括第一相机模块、第二相机模块及处理模块，所述第一相机模块和第二相机模块用于同时对同一场景进行取景，根据不同帧图像的对比度进行检测及分析，对焦点搜索范围包括互不重合的第一对焦区域和第二对焦区域，所述处理模块用于控制所述第一相机模块在所述第一对焦区域内搜索对焦点，同时控制所述第二相机模块在所述第二对焦区域内搜索对焦点，所述处理模块还用于在获取所述第一相机模块和第二相机模块中先获取对焦点信息的相机模块处于对焦点获取图像。
  9. 一种图像获取方法，包括步骤:
    控制所述第一相机模块和第二相机模块同时对同一场景进行取景
    同时控制所述第一相机模块和第二相机模块分别在互不重合的对焦点搜索范围内搜索对焦点，获取第一相机模块或第二相机模块对焦点的位置信息；
    根据获取的所述对焦点信息，确定所述第一相机模块的对应对焦点；以及
    控制所述第一相机模块位于对焦点获取图像。
  10. 如权利要求9所述的图像获取方法，其特征在于，当获取到所述第一相机模块的对焦点信息时，控制所述第一相机模块处于对焦点并输出图像，当获取到所述第二相机模块的对焦点信息时，根据所述第二相机模块的对焦点信息，控制所述第一相机模块直接将对焦位置移动至对焦点。
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