WO2016119150A1 - 具有多摄像头的移动终端的拍摄方法和移动终端 - Google Patents

具有多摄像头的移动终端的拍摄方法和移动终端 Download PDF

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Publication number
WO2016119150A1
WO2016119150A1 PCT/CN2015/071769 CN2015071769W WO2016119150A1 WO 2016119150 A1 WO2016119150 A1 WO 2016119150A1 CN 2015071769 W CN2015071769 W CN 2015071769W WO 2016119150 A1 WO2016119150 A1 WO 2016119150A1
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Prior art keywords
focal length
camera
image
mobile terminal
effective focal
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English (en)
French (fr)
Inventor
陈能
王强
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Yulong Computer Telecommunication Scientific Shenzhen Co Ltd
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Yulong Computer Telecommunication Scientific Shenzhen Co Ltd
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Priority to PCT/CN2015/071769 priority Critical patent/WO2016119150A1/zh
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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
    • H04N23/60—Control of cameras or camera modules
    • H04N23/69—Control of means for changing angle of the field of view, e.g. optical zoom objectives or electronic zooming

Definitions

  • the present invention relates to the field of photographing, and in particular to a photographing method and a mobile terminal of a mobile terminal having multiple cameras.
  • the camera is already standard on the mobile terminal, and the shooting effect has become one of the important performances of the mobile terminal.
  • the optical zoom lens is not suitable for increasingly thin mobile terminals.
  • the camera of the mobile terminal usually adopts a fixed focus camera, that is, has a fixed effective focal length (EFL: Effective Focal Length) and the field of view (FOV: Field Of View) lens.
  • ENL Effective Focal Length
  • FOV Field Of View
  • the mobile terminal adopts a digital zoom function.
  • Digital zoom When the camera obtains an image, the local data of the image is retrieved and enlarged by an interpolation algorithm to obtain an effect similar to optical zoom.
  • digital zoom uses the same focal length to describe the effect of digital zoom.
  • the effective focal length of the lens is 2.4mm, and after 2x digital zoom, an image obtained with a lens with a focal length of 4.8mm will be obtained.
  • the digital zoom reduces the image quality, and the larger the ratio of the equivalent focal length after the digital zoom is enlarged to the effective focal length of the corresponding lens, the worse the image quality obtained. Therefore, in order to ensure the quality of the output image, the mobile terminal currently uses only a narrow zoom interval.
  • a main object of the present invention is to provide a photographing method and a mobile terminal of a mobile terminal having a multi-camera, aiming at ensuring an output image quality while widening a zoom section.
  • the present invention provides a method for photographing a mobile terminal having a multi-camera, and the photographing method of the mobile terminal having a multi-camera includes the following steps:
  • the mobile terminal When the mobile terminal outputs the control information that enlarges the output image by the target focal length when outputting according to the first image captured by the first camera, it is determined whether the target focal length is less than, equal to, or greater than the effective focal length of the second camera, wherein The effective focal length of the second camera is greater than the effective focal length of the first camera;
  • the acquired second image is subjected to digital zoom processing, and a second processed image having an equivalent focal length of the target focal length is obtained and output.
  • the mobile terminal outputs the image to a display screen, a storage device or an external device.
  • the method further comprises the steps of:
  • the first processed image and the second processed image are obtained, and the first processed image and the second processed image are combined and output;
  • the acquired second image is subjected to digital zoom processing to obtain and output a second processed image having an equivalent focal length of the target focal length.
  • the effective focal length of the second camera is twice the effective focal length of the first camera, and the preset threshold is 2.
  • the mobile terminal determines whether the target focal length is less than, equal to, or greater than the effective focal length of the third camera, wherein the effective focal length of the third camera is greater than the effective focal length of the second camera;
  • the third processed image is an image with an equivalent focal length obtained from the third image as a target focal length.
  • the other processed image is an image obtained from an image captured by another camera and having an equivalent focal length as the target focal length;
  • the mobile terminal includes a multi-camera, and the mobile terminal further includes:
  • a first determining module configured to: when the mobile terminal outputs the control information that enlarges the output image by the target focal length when outputting the first image captured by the first camera, determine whether the target focal length is less than, equal to, or greater than An effective focal length of the second camera, wherein an effective focal length of the second camera is greater than an effective focal length of the first camera;
  • a first amplifying module configured to perform digital zoom processing on the acquired first image when the first determining module determines to be smaller, and obtain and output a first processed image whose equivalent focal length is the target focal length;
  • a second straight out module configured to acquire a second image captured by the second camera and output when the first determining module determines to be equal to
  • the second amplifying module is configured to perform digital zoom processing on the acquired second image when the first determining module determines to be greater than, and obtain and output a second processed image whose equivalent focal length is the target focal length.
  • the mobile terminal outputs the image to a display screen, a storage device or an external device.
  • the mobile terminal further includes:
  • a threshold module configured to determine whether a ratio of the target focal length to an effective focal length of the second camera exceeds a preset threshold
  • a synthesis output module configured to: when the threshold module determines that the threshold value is exceeded, obtain the first processed image and the second processed image, and combine the first processed image and the second processed image to output;
  • the second amplifying module is further configured to perform digital zoom processing on the acquired second image when the threshold module determines that the threshold value is not exceeded, and obtain and output a second processing with an equivalent focal length as the target focal length image.
  • the effective focal length of the second camera is twice the effective focal length of the first camera, and the preset threshold is 2.
  • the mobile terminal further includes a third camera; the mobile terminal further includes:
  • a second determining module configured to determine whether the target focal length is less than, equal to, or greater than an effective focal length of the third camera, wherein an effective focal length of the third camera is greater than an effective focal length of the second camera;
  • a third straight out module configured to acquire a third image captured by the third camera and output when the second determining module determines to be equal to;
  • a third amplification module configured to output a third processed image or combine the third processed image with another processed image after the second determining module determines that the second processing module is greater than
  • the equivalent focal length obtained by the three images is an image of the target focal length
  • the other processed images are images obtained by the equivalent focal length obtained according to the images captured by other cameras as the target focal length
  • the threshold module is further configured to determine whether a ratio of the target focal length to the effective focal length of the second camera exceeds a preset threshold when the second determining module determines to be less than.
  • the photographing method and the mobile terminal of the mobile terminal with multi-camera provided by the present invention by setting the cameras with different effective focal lengths, and digitally zooming or switching the cameras according to different target focal lengths, the mobile terminal using the fixed focus camera has both
  • the digital zoom effect has an optical zoom effect, which allows the mobile terminal to ensure image quality while having a wide zoom range.
  • FIG. 1 is a schematic flow chart of a first embodiment of a method for photographing a mobile terminal having multiple cameras according to the present invention
  • FIG. 2 is a schematic flow chart of a second embodiment of a method for photographing a mobile terminal having multiple cameras according to the present invention
  • FIG. 3 is a schematic flow chart of a third embodiment of a method for photographing a mobile terminal having multiple cameras according to the present invention.
  • FIG. 4 is a schematic block diagram of an embodiment of a mobile terminal according to the present invention.
  • the present invention provides a photographing method and a mobile terminal of a mobile terminal having multiple cameras.
  • FIG. 1 is a schematic flow chart of a first embodiment of a method for photographing a mobile terminal having multiple cameras according to the present invention.
  • the mobile terminal includes multiple cameras, and the effective focal length of each camera of the mobile terminal is different from the effective focal length of other cameras.
  • the shooting method of the mobile terminal having multiple cameras includes the following steps:
  • step S100 the mobile terminal outputs an image according to the first image captured by the first camera.
  • the first camera is one of a plurality of cameras, and the first camera may be a default camera.
  • the default first lens will be used for shooting.
  • the camera of the mobile terminal adopts a fixed focus camera, so the first camera will always shoot with its effective focal length, and cannot be optically zoomed.
  • the mobile terminal outputs a first image captured by the first camera; when performing amplification, an image with an equivalent focal length greater than the effective focal length of the first camera is obtained after digital zooming according to the first image, and then output .
  • Step S200 when the mobile terminal receives the control information for amplifying the output image by the target focal length, determining whether the target focal length is less than, equal to, or greater than the effective focal length of the second camera, wherein the effective focal length of the second camera is greater than the The effective focal length of the first camera; if it is less, step S300 is performed; if it is equal to, step S400 is performed; if it is greater, step S500 is performed.
  • Step S300 performing digital zoom processing on the acquired first image, and obtaining and outputting a first processed image whose equivalent focal length is the target focal length.
  • Step S400 acquiring a second image captured by the second camera and outputting.
  • Step S500 performing digital zoom processing on the acquired second image, and obtaining and outputting a second processed image having an equivalent focal length of the target focal length.
  • the control information may be input by the input device or may be spontaneous by the system of the mobile terminal. Since the camera of the mobile terminal is a fixed focus camera, it is necessary to perform digital zoom processing on the picture obtained by the camera to meet the requirement of outputting images with different target focal lengths.
  • the effective focal length of the first camera As 2.4 mm and the effective focal length of the second camera as 4.8 mm as an example.
  • the target focal length is 3.6 mm
  • the first image captured by the first camera is subjected to digital zoom processing to generate a first processed image having an equivalent focal length of 3.6 mm, and then the first processing is performed. Image output.
  • the target focal length becomes 4.8 mm
  • the effective focal length of the second camera is also 4.8 mm
  • the second image captured by the second camera is directly outputted and the captured second image is directly output. Since when the mobile terminal is switched from the first camera to the second camera, it is equivalent to optical zooming, thereby having better output image quality.
  • the second image is captured by the second camera, and the second image is digitally zoomed to generate a second processed image having an equivalent focal length of 6 mm, and then the second processing is performed.
  • Image output When it is required to output an image with a target focal length of 6 mm, the second image is captured by the second camera, and the second image is digitally zoomed to generate a second processed image having an equivalent focal length of 6 mm, and then the second processing is performed.
  • Image output is
  • the shooting method of the mobile terminal with multiple cameras provides a digital zoom or a camera switching according to different target focal lengths by setting a camera with different effective focal lengths.
  • the mobile terminal using the fixed focus camera has both a digital zoom effect and an optical zoom effect, thereby enabling the mobile terminal to ensure image quality while having a wide zoom range.
  • the mobile terminal may output the image to a display for preview, output to a storage device, or to an external device that has established a connection.
  • FIG. 2 is a schematic flow chart of a second embodiment of a method for photographing a mobile terminal having multiple cameras according to the present invention.
  • the embodiment is based on the first embodiment, and steps S600 and S700 are added. Specifically, after determining that the target focal length is greater than the effective focal length of the second camera in step S200:
  • step S600 it is determined whether the ratio of the target focal length to the effective focal length of the second camera exceeds a preset threshold; if yes, step S700 is performed; if not, step S500 is performed.
  • Step S700 Obtain the first processed image and the second processed image, and combine the first processed image and the second processed image to output.
  • the threshold value is set in this embodiment.
  • the first processed image and the second processed image are combined to obtain a clearer image and then output, thereby improving the quality of the output image.
  • the threshold is set to 2; also to avoid poor quality of the first processed image of the output, preferably, the effective focal length of the second camera is twice that of the first camera.
  • the threshold is set to 9.6 mm.
  • FIG. 3 is a schematic flowchart diagram of a third embodiment of a method for photographing a mobile terminal having multiple cameras according to the present invention.
  • This embodiment is based on the second embodiment, and steps S800, S900, and S1000 are added. Specifically, after determining in step S200 that the target focal length is greater than the effective focal length of the second camera:
  • step S800 the mobile terminal determines whether the target focal length is less than, equal to, or greater than the effective focal length of the third camera, wherein the effective focal length of the third camera is greater than the effective focal length of the second camera; if equal, step S900 is performed. If it is greater, step S1000 is performed; if it is less, step S600 is performed.
  • Step S900 acquiring a third image captured by the third camera and outputting.
  • step S1000 the third processed image is output or the third processed image is combined with other processed images and output.
  • the third processed image is an image with an equivalent focal length obtained from the third image as a target focal length
  • the other processed images are equivalent focal lengths obtained according to images captured by other cameras as the target focal length Image.
  • the other processed image may be a first processed image obtained according to the first camera, a second processed image obtained according to the second camera, and of course may be other processing obtained according to other cameras than the first camera and the second camera. image.
  • the composite output is performed; otherwise, the third processed image may be directly output.
  • the mobile terminal when the target focal length is equal to the third camera, the mobile terminal will switch to the third camera. Since the target focal length is equal to the third camera, the digital zoom function is not used, which is equivalent to the optical zoom of the mobile terminal, and the quality of the output image is better. It can be understood that the more the cameras, the smaller the difference in the effective focal length between the cameras, the better the image quality output during the entire zooming process. When the difference of the effective focal lengths between the cameras is large, a plurality of processed images may be combined and outputted, and the image quality output during the zooming process may be better.
  • the invention also provides a mobile terminal.
  • FIG. 4 is a schematic diagram of a module of an embodiment of a mobile terminal according to the present invention.
  • the mobile terminal 10 includes a plurality of cameras 101, and the effective focal lengths of the cameras 101 of the mobile terminal 10 are different.
  • the mobile terminal 10 further includes:
  • the first determining module 102 is configured to: when the mobile terminal receives the control information that enlarges the output image by the target focal length when outputting the first image captured by the first camera, determine whether the target focal length is less than, equal to, or greater than An effective focal length of the second camera, wherein an effective focal length of the second camera is greater than an effective focal length of the first camera.
  • the first camera is one of the plurality of cameras 101, and the first camera may be a default camera.
  • the default first lens will be used for shooting.
  • the camera of the mobile terminal adopts a fixed focus camera, so the first camera will always shoot with its effective focal length, and cannot be optically zoomed.
  • the mobile terminal outputs a first image captured by the first camera; when performing amplification, an image with an equivalent focal length greater than the effective focal length of the first camera is obtained after digital zooming according to the first image, and then output .
  • the first amplifying module 103 is configured to perform digital zoom processing on the acquired first image when the first determining module 102 determines that it is smaller, and obtain and output a first processed image whose equivalent focal length is the target focal length.
  • the second straight-out module 104 is configured to acquire the second image captured by the second camera 102 and output when the first determining module 102 determines that it is equal to.
  • the second amplifying module 105 is configured to perform digital zoom processing on the acquired second image when the first determining module 102 determines to be greater than, and obtain and output a second processed image with an equivalent focal length of the target focal length.
  • the control information may be input by the input device or may be spontaneous by the system of the mobile terminal. Since the camera of the mobile terminal is a fixed focus camera, it is necessary to perform digital zoom processing on the picture obtained by the camera to meet the requirement of outputting images with different target focal lengths.
  • the effective focal length of the first camera as 2.4 mm and the effective focal length of the second camera as 4.8 mm as an example.
  • the target focal length is 3.6 mm
  • the first image captured by the first camera is subjected to digital zoom processing to generate a first processed image having an equivalent focal length of 3.6 mm, and then the first processing is performed. Image output.
  • the target focal length becomes 4.8 mm
  • the effective focal length of the second camera is also 4.8 mm
  • the second image is captured by the second camera, and the captured second image is directly output.
  • the mobile terminal switches from the first camera to the second camera, it is equivalent to optical zooming, thereby having better output image quality.
  • the second image is captured by the second camera, and the second image is digitally zoomed to generate a second processed image having an equivalent focal length of 6 mm, and then the second processing is performed.
  • Image output When it is required to output an image with a target focal length of 6 mm, the second image is captured by the second camera, and the second image is digitally zoomed to generate a second processed image having an equivalent focal length of 6 mm, and then the second processing is performed.
  • Image output is
  • the shooting method of the mobile terminal with multiple cameras provides a digital zoom or a camera switching according to different target focal lengths by setting a camera with different effective focal lengths.
  • the mobile terminal using the fixed focus camera has both a digital zoom effect and an optical zoom effect, thereby enabling the mobile terminal to ensure image quality while having a wide zoom range.
  • the mobile terminal may output the image to a display on a display screen, output to a storage device, or transmit to an external device that has established a connection.
  • the mobile terminal 10 further includes:
  • the threshold module 106 is configured to determine whether a ratio of the target focal length to the effective focal length of the second camera 102 exceeds a preset threshold.
  • the composite output module 107 is configured to: when the threshold module 106 determines that the threshold value is exceeded, obtain the first processed image and the second processed image, and combine the first processed image and the second processed image to output.
  • the second amplifying module 105 is further configured to perform digital zoom processing on the acquired second image when the threshold module 106 determines that the threshold is not exceeded, and obtain and output an equivalent focal length as the target focal length. Second, the image is processed.
  • the threshold value is set in this embodiment.
  • the first processed image and the second processed image are combined to obtain a clearer image and then output, thereby improving the quality of the output image.
  • the threshold is set to 2; also to avoid poor quality of the first processed image of the output, preferably, the effective focal length of the second camera 102 is twice that of the first camera 101.
  • the threshold is set to 9.6 mm.
  • the mobile terminal 10 further includes a third camera; the mobile terminal 10 further includes:
  • the second determining module 108 is configured to determine whether the target focal length is less than, equal to, or greater than an effective focal length of the third camera, wherein an effective focal length of the third camera is greater than an effective focal length of the second camera.
  • the third straight-out module 109 is configured to acquire a third image captured by the third camera and output the second determination module 108 when it is determined to be equal.
  • the third amplifying module 110 is configured to output a third processed image or combine the third processed image with other processed images after the second determining module determines to be greater than the output.
  • the third processed image is an image with an equivalent focal length obtained from the third image as a target focal length
  • the other processed images are equivalent focal lengths obtained according to images captured by other cameras as the target focal length
  • the image, the other processed image may be the first processed image obtained according to the first camera, the second processed image obtained according to the second camera, and of course may be obtained according to other cameras than the first camera and the second camera.
  • Other processing images Preferably, when it is determined that the ratio of the target focal length to the effective focal length of the second camera exceeds a corresponding threshold, the composite output is performed; otherwise, the third processed image may be directly output.
  • the threshold module 106 is further configured to determine whether a ratio of the target focal length to the effective focal length of the second camera 102 exceeds a preset threshold when the second determining module 108 determines to be less than.
  • the mobile terminal when the target focal length is equal to the third camera, the mobile terminal will switch to the third camera. Since the target focal length is equal to the third camera, the digital zoom function is not used, which is equivalent to the optical zoom of the mobile terminal, and the quality of the output image is better. It can be understood that the more the cameras, the smaller the difference in the effective focal length between the cameras, the better the image quality output during the entire zooming process. When the difference of the effective focal lengths between the cameras is large, a plurality of processed images may be combined and outputted, and the image quality output during the zooming process may be better.

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Abstract

本发明公开了一种具有多摄像头的移动终端的拍摄方法和移动终端，其中，移动终端的每一摄像头的有效焦距与其他摄像头的有效焦距不同，具有多摄像头的移动终端的拍摄方法包括以下步骤：当移动终端在根据第一摄像头拍得的第一图像而输出图像时，接收到以目标焦距放大输出图像的控制信息，则判断目标焦距是否小于、等于或大于第二摄像头的有效焦距；若小于，则对获取的第一图像进行数码变焦处理，获得并输出等效焦距为目标焦距的第一处理图像；若等于，则获取第二摄像头拍得的第二图像并输出；若大于，则对获取的第二图像进行数码变焦处理，获得并输出等效焦距为目标焦距的第二处理图像。本发明具有保证输出图像质量的同时增宽变焦区间的效果。

Description

具有多摄像头的移动终端的拍摄方法和移动终端
技术领域
本发明涉及拍摄领域，尤其涉及具有多摄像头的移动终端的拍摄方法和移动终端。
背景技术
摄像头已经属于移动终端的标配，并且拍摄效果也成为移动终端的重要性能之一。
由于光学变焦镜头具有厚度较厚的特点，因此光学变焦镜头并不适用于越来越薄的移动终端。为了控制移动终端的厚度，移动终端的摄像头通常采用定焦摄像头，即具有固定的有效焦距（EFL: Effective Focal Length）和视场角（FOV: Field Of View）的镜头。
为了使得配备定焦镜头的移动终端能给人以变焦的效果，移动终端采用了数码变焦功能。数码变焦：当摄像头获得了图像后，调取图像的局部数据并通过插值算法进行放大处理，从而获得类似于光学变焦的效果。其中，数码变焦采用等同焦距来描述数码变焦的效果。例如，镜头的有效焦距为2.4mm，当进行2倍数码变焦后，将得到类似焦距为4.8mm的镜头所获得的图像。但是，数码变焦会降低图像质量，数码变焦放大后的等同焦距与对应镜头的有效焦距的比值越大则获得的图像质量越差。因此，目前移动终端为了保证输出图像的质量，仅采用较窄的变焦区间。
发明内容
本发明的主要目的在于提供一种具有多摄像头的移动终端的拍摄方法和移动终端，旨在保证输出图像质量的同时增宽变焦区间。
本发明提供的具有多摄像头的移动终端的拍摄方法，所述具有多摄像头的移动终端的拍摄方法包括以下步骤：
当移动终端在根据第一摄像头拍得的第一图像而输出时，接收到以目标焦距放大输出图像的控制信息，则判断所述目标焦距是否小于、等于或大于第二摄像头的有效焦距，其中，所述第二摄像头的有效焦距大于所述第一摄像头的有效焦距；
若小于，则对获取的所述第一图像进行数码变焦处理，获得并输出等效焦距为所述目标焦距的第一处理图像；
若等于，则获取第二摄像头拍得的第二图像并输出；
若大于，则对获取的所述第二图像进行数码变焦处理，获得并输出等效焦距为所述目标焦距的第二处理图像。
优选地，所述移动终端将所述图像输出至显示屏、储存设备或外部设备上。
优选地，在判定所述目标焦距大于所述第二摄像头的有效焦距之后，并在对获取的所述第二图像进行数码变焦处理的步骤之前，还包括步骤：
判断所述目标焦距与所述第二摄像头的有效焦距的比值是否超过预设的阈值；
若超过所述阈值，获得所述第一处理图像和第二处理图像，并将所述第一处理图像和第二处理图像合成后输出；
若未超过阈值，则对获取的所述第二图像进行数码变焦处理，获得并输出等效焦距为所述目标焦距的第二处理图像。
优选地，所述第二摄像头的有效焦距为第一摄像头的有效焦距的两倍，预设的所述阈值为2。
优选地，在判定所述目标焦距大于所述第二摄像头的有效焦距之后，并在判断所述目标焦距与所述第二摄像头的有效焦距的比值是否超过预设的阈值的步骤之前，还包括步骤：
移动终端判断所述目标焦距是否小于、等于或大于第三摄像头的有效焦距，其中，所述第三摄像头的有效焦距大于所述第二摄像头的有效焦距；
若等于，则获取第三摄像头拍得的第三图像并输出；
若大于，则输出第三处理图像或将所述第三处理图像与其他处理图像合成后输出，所述第三处理图像为根据所述第三图像获得的等效焦距为目标焦距的图像，所述其他处理图像是根据其他摄像头拍得的图像而获得的等效焦距为所述目标焦距的图像；
若小于，则判断所述目标焦距与所述第二摄像头的有效焦距的比值是否超过预设的阈值。
本发明提供的移动终端，所述移动终端包括多摄像头，所述移动终端还包括：
第一判断模块，用于当移动终端在根据第一摄像头拍得的第一图像而输出时，接收到以目标焦距放大输出图像的控制信息，则判断所述目标焦距是否小于、等于或大于第二摄像头的有效焦距，其中，所述第二摄像头的有效焦距大于所述第一摄像头的有效焦距；
第一放大模块，用于当第一判断模块判定为小于时，则对获取的所述第一图像进行数码变焦处理，获得并输出等效焦距为所述目标焦距的第一处理图像；
第二直出模块，用于当第一判断模块判定为等于时，则获取第二摄像头拍得的第二图像并输出；
第二放大模块，用于当第一判断模块判定为大于时，则对获取的所述第二图像进行数码变焦处理，获得并输出等效焦距为所述目标焦距的第二处理图像。
优选地，所述移动终端将所述图像输出至显示屏、储存设备或外部设备上。
优选地，所述移动终端还包括：
阈值模块，用于判断所述目标焦距与所述第二摄像头的有效焦距的比值是否超过预设的阈值；
合成输出模块，用于当所述阈值模块判定超过所述阈值时，获得所述第一处理图像和第二处理图像，并将所述第一处理图像和第二处理图像合成后输出；
所述第二放大模块还用于当所述阈值模块判定未超过所述阈值时，对获取的所述第二图像进行数码变焦处理，获得并输出等效焦距为所述目标焦距的第二处理图像。
优选地，所述第二摄像头的有效焦距为第一摄像头的有效焦距的两倍，预设的所述阈值为2。
优选地，所述移动终端还包括第三摄像头；所述移动终端还包括：
第二判断模块，用于判断所述目标焦距是否小于、等于或大于第三摄像头的有效焦距，其中，所述第三摄像头的有效焦距大于所述第二摄像头的有效焦距；
第三直出模块，用于当第二判断模块判定为等于时，则获取第三摄像头拍得的第三图像并输出；
第三放大模块，用于当第二判断模块判定为大于时，则输出第三处理图像或将所述第三处理图像与其他处理图像合成后输出，所述第三处理图像为根据所述第三图像获得的等效焦距为目标焦距的图像，所述其他处理图像是根据其他摄像头拍得的图像而获得的等效焦距为所述目标焦距的图像；
所述阈值模块还用于当第二判断模块判定为小于时，判断所述目标焦距与所述第二摄像头的有效焦距的比值是否超过预设的阈值。
本发明所提供的具有多摄像头的移动终端的拍摄方法和移动终端，通过设置有效焦距不同的摄像头，并可以根据目标焦距的不同而数码变焦或切换摄像头，则采用定焦摄像头的移动终端既具有数码变焦效果，又具有光学变焦的效果，进而使得移动终端可以在具有较宽的变焦范围的同时保证图像质量。
附图说明
图1为本发明具有多摄像头的移动终端的拍摄方法第一实施例的流程示意图；
图2为本发明具有多摄像头的移动终端的拍摄方法第二实施例的流程示意图；
图3为本发明具有多摄像头的移动终端的拍摄方法第三实施例的流程示意图；
图4为本发明移动终端一实施例的模块示意图。
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
本发明提供了一种具有多摄像头的移动终端的拍摄方法和移动终端。
请参看图1，图1为本发明具有多摄像头的移动终端的拍摄方法第一实施例的流程示意图。
在本实施例中，所述移动终端包括多摄像头，所述移动终端的各摄像头的有效焦距与其他摄像头的有效焦距不同，具有多摄像头的所述移动终端的拍摄方法包括以下步骤：
步骤S100，移动终端根据第一摄像头拍得的第一图像输出图像。
第一摄像头为多个摄像头之一，第一摄像头可以是默认摄像头，则移动终端启动拍摄功能时，将会采用默认的第一镜头进行拍摄。本实施例中移动终端的摄像头采用定焦摄像头，因此第一摄像头将始终以其有效焦距进行拍摄，而不能光学变焦。当未进行放大时，移动终端则输出第一摄像头拍得的第一图像；当进行放大时，则根据第一图像进行数码变焦后获得等效焦距大于第一摄像头的有效焦距的图像，然后输出。
步骤S200，当移动终端接收到以目标焦距放大输出图像的控制信息时，判断所述目标焦距是否小于、等于或大于第二摄像头的有效焦距，其中，所述第二摄像头的有效焦距大于所述第一摄像头的有效焦距；若小于，则执行步骤S300；若等于，则执行步骤S400；若大于，则执行步骤S500。
步骤S300，对获取的所述第一图像进行数码变焦处理，获得并输出等效焦距为所述目标焦距的第一处理图像。
步骤S400，获取第二摄像头拍得的第二图像并输出。
步骤S500，对获取的所述第二图像进行数码变焦处理，获得并输出等效焦距为所述目标焦距的第二处理图像。
所述控制信息可以是输入设备输入的，也可以是移动终端的系统自发的。由于移动终端的摄像头为定焦摄像头，因此，需要对摄像头拍摄获得的图片进行数码变焦处理，才能满足以不同的目标焦距输出图像的要求。
以第一摄像头的有效焦距为2.4mm，第二摄像头的有效焦距为4.8mm为例。当目标焦距为3.6mm时，则将通过第一摄像头拍得的第一图像，再对第一图像进行数码变焦处理，以产生等效焦距为3.6mm的第一处理图像，再将第一处理图像输出。当目标焦距变为4.8mm时，由于第二摄像头的有效焦距也为4.8mm，则通过第二摄像头拍得的第二图像，并直接输出拍得的第二图像即可。由于当移动终端从第一摄像头切换为第二摄像头时，相当于进行了光学变焦，从而具有较好的输出图像质量。当需要以6mm的目标焦距输出图像时，则通过第二摄像头拍得第二图像，再对第二图像进行数码变焦处理，以产生等效焦距为6mm的第二处理图像，再将第二处理图像输出。
为了解决背景技术中所提及的技术问题，本实施例所提供的具有多摄像头的移动终端的拍摄方法，通过设置有效焦距不同的摄像头，并可以根据目标焦距的不同而数码变焦或切换摄像头，使得采用定焦摄像头的移动终端既具有数码变焦效果，又具有光学变焦的效果，进而使得移动终端可以在具有较宽的变焦范围的同时保证图像质量。
优选地，所述移动终端可以将所述图像输出至显示屏上显示以供预览，输出至储存设备上储存，或传输至已建立连接的外部设备上。
请参看图2，图2为本发明具有多摄像头的移动终端的拍摄方法第二实施例的流程示意图。
本实施例以第一实施例为基础，新增了步骤S600和步骤S700，具体地，在步骤S200中判定所述目标焦距大于所述第二摄像头的有效焦距之后：
步骤S600，判断所述目标焦距与所述第二摄像头的有效焦距的比值是否超过预设的阈值；若是，则执行步骤S700；若否，则执行步骤S500。
步骤S700，获得所述第一处理图像和第二处理图像，并将所述第一处理图像和第二处理图像合成后输出。
由于数码变焦放大后的等同焦距与对应镜头的有效焦距的比值越大则获得的图像质量越差。为了避免等效焦距较大时变焦获得的图像质量差，本实施例设置了所述阈值。当所述比值增大至超过所述阈值时，通过将所述第一处理图像和第二处理图像合成，以获得更清晰的图像后再进行输出，从而提高输出图片的质量。可以理解的是，本实施例中仅以两个处理后的图像进行合成来说明，而非限定。在其他实施例中，也可以根据需要采用三个、四个或更多个处理后的图像进行合成。
优选地，所述阈值设为2；同样为了避免输出的第一处理图像质量差，优选地，所述第二摄像头的有效焦距为第一摄像头的两倍。例如当第一摄像头的有效焦距为2.4mm时，第二摄像头的有效焦距为4.8mm，则所述阈值设置为9.6mm。
请参看图3，图3为本发明具有多摄像头的移动终端的拍摄方法第三实施例的流程示意图。
本实施例以第二实施例为基础，新增了步骤S800、步骤S900和步骤S1000。具体地，在步骤S200中判定所述目标焦距大于所述第二摄像头的有效焦距之后：
步骤S800，移动终端判断所述目标焦距是否小于、等于或大于第三摄像头的有效焦距，其中，所述第三摄像头的有效焦距大于所述第二摄像头的有效焦距；若等于，则执行步骤S900；若大于，则执行步骤S1000；若小于，则执行步骤S600。
步骤S900，获取第三摄像头拍得的第三图像并输出。
步骤S1000，输出第三处理图像或将所述第三处理图像与其他处理图像合成后输出。
其中，所述第三处理图像为根据所述第三图像获得的等效焦距为目标焦距的图像，所述其他处理图像是根据其他摄像头拍得的图像而获得的等效焦距为所述目标焦距的图像。其他处理图像可以是根据第一摄像头获得的第一处理图像、根据第二摄像头获得的第二处理图像，当然还可以是根据除了第一摄像头和第二摄像头之外的其他摄像头而获得的其他处理图像。优选地，当判定所述目标焦距与所述第二摄像头的有效焦距的比值超过相应的阈值时，进行合成输出；否则直接输出第三处理图像即可。
本实施例中，当目标焦距与第三摄像头相等时，则移动终端将切换至第三摄像头。由于目标焦距与第三摄像头相等，因此，并不会采用数码变焦功能，相当于移动终端进行了光学变焦，则此时输出的图像的质量较好。可以理解的是，摄像头越多，各摄像头之间的有效焦距的差值越小，则整个变焦过程中输出的图像质量越好。当各摄像头之间的有效焦距的差值较大时，可以采用多个处理后的图像合成后再输出，也可以使得变焦过程中输出的图像质量较好。
本发明还提供了一种移动终端。
请参看图4，图4为本发明移动终端一实施例的模块示意图。
本实施例中，所述移动终端10，包括多个摄像头101，所述移动终端10的各摄像头101的有效焦距不同，所述移动终端10还包括：
第一判断模块102，用于当移动终端在根据第一摄像头拍得的第一图像而输出时，接收到以目标焦距放大输出图像的控制信息，则判断所述目标焦距是否小于、等于或大于第二摄像头的有效焦距，其中，所述第二摄像头的有效焦距大于所述第一摄像头的有效焦距。
第一摄像头为多个摄像头101之一，第一摄像头可以是默认摄像头，则移动终端启动拍摄功能时，将会采用默认的第一镜头进行拍摄。本实施例中移动终端的摄像头采用定焦摄像头，因此第一摄像头将始终以其有效焦距进行拍摄，而不能光学变焦。当未进行放大时，移动终端则输出第一摄像头拍得的第一图像；当进行放大时，则根据第一图像进行数码变焦后获得等效焦距大于第一摄像头的有效焦距的图像，然后输出。
第一放大模块103，用于当第一判断模块102判定为小于时，则对获取的所述第一图像进行数码变焦处理，获得并输出等效焦距为所述目标焦距的第一处理图像。
第二直出模块104，用于当第一判断模块102判定为等于时，则获取第二摄像头102拍得的第二图像并输出。
第二放大模块105，用于当第一判断模块102判定为大于时，则对获取的所述第二图像进行数码变焦处理，获得并输出等效焦距为所述目标焦距的第二处理图像。
所述控制信息可以是输入设备输入的，也可以是移动终端的系统自发的。由于移动终端的摄像头为定焦摄像头，因此，需要对摄像头拍摄获得的图片进行数码变焦处理，才能满足以不同的目标焦距输出图像的要求。
以第一摄像头的有效焦距为2.4mm，第二摄像头的有效焦距为4.8mm为例。当目标焦距为3.6mm时，则将通过第一摄像头拍得的第一图像，再对第一图像进行数码变焦处理，以产生等效焦距为3.6mm的第一处理图像，再将第一处理图像输出。当目标焦距变为4.8mm时，由于第二摄像头的有效焦距也为4.8mm，则通过第二摄像头拍得第二图像，并直接输出拍得的第二图像即可。当移动终端从第一摄像头切换为第二摄像头时，相当于进行了光学变焦，从而具有较好的输出图像质量。当需要以6mm的目标焦距输出图像时，则通过第二摄像头拍得第二图像，再对第二图像进行数码变焦处理，以产生等效焦距为6mm的第二处理图像，再将第二处理图像输出。
为了解决背景技术中所提及的技术问题，本实施例所提供的具有多摄像头的移动终端的拍摄方法，通过设置有效焦距不同的摄像头，并可以根据目标焦距的不同而数码变焦或切换摄像头，使得采用定焦摄像头的移动终端既具有数码变焦效果，又具有光学变焦的效果，进而使得移动终端可以在具有较宽的变焦范围的同时保证图像质量。
其中，所述移动终端可以将所述图像输出至显示屏上显示，输出至储存设备上储存，或传输至已建立连接的外部设备上。
优选地，所述移动终端10还包括：
阈值模块106，用于判断所述目标焦距与所述第二摄像头102的有效焦距的比值是否超过预设的阈值。
合成输出模块107，用于当所述阈值模块106判定超过所述阈值时，获得所述第一处理图像和第二处理图像，并将所述第一处理图像和第二处理图像合成后输出。
所述第二放大模块105还用于当所述阈值模块106判定未超过所述阈值时，对获取的所述第二图像进行数码变焦处理，获得并输出等效焦距为所述目标焦距的第二处理图像。
由于数码变焦放大后的等同焦距与对应镜头的有效焦距的比值越大则获得的图像质量越差。为了避免等效焦距较大时变焦获得的图像质量差，本实施例设置了所述阈值。当所述比值增大至超过所述阈值时，通过将所述第一处理图像和第二处理图像合成，以获得更清晰的图像后再进行输出，从而提高输出图片的质量。可以理解的是，本实施例中仅以两个处理后的图像进行合成来说明，而非限定。在其他实施例中，也可以根据需要采用三个、四个或更多个处理后的图像进行合成。
优选地，所述阈值设为2；同样为了避免输出的第一处理图像质量差，优选地，所述第二摄像头102的有效焦距为第一摄像头101的两倍。例如当第一摄像头的有效焦距为2.4mm时，第二摄像头的有效焦距为4.8mm，则所述阈值设置为9.6mm。
优选地，所述移动终端10还包括第三摄像头；所述移动终端10还包括：
第二判断模块108，用于判断所述目标焦距是否小于、等于或大于第三摄像头的有效焦距，其中，所述第三摄像头的有效焦距大于所述第二摄像头的有效焦距。
第三直出模块109，用于当第二判断模块108判定为等于时，则获取第三摄像头拍得的第三图像并输出。
第三放大模块110，用于当第二判断模块判定为大于时，则输出第三处理图像或将所述第三处理图像与其他处理图像合成后输出。
其中，所述第三处理图像为根据所述第三图像获得的等效焦距为目标焦距的图像，所述其他处理图像是根据其他摄像头拍得的图像而获得的等效焦距为所述目标焦距的图像，其他处理图像可以是根据第一摄像头获得的第一处理图像、根据第二摄像头获得的第二处理图像，当然还可以是根据除了第一摄像头和第二摄像头之外的其他摄像头而获得的其他处理图像。优选地，当判定所述目标焦距与所述第二摄像头的有效焦距的比值超过相应的阈值时，进行合成输出；否则直接输出第三处理图像即可。
所述阈值模块106还用于当第二判断模块108判定为小于时，判断所述目标焦距与所述第二摄像头102的有效焦距的比值是否超过预设的阈值。
本实施例中，当目标焦距与第三摄像头相等时，则移动终端将切换至第三摄像头。由于目标焦距与第三摄像头相等，因此，并不会采用数码变焦功能，相当于移动终端进行了光学变焦，则此时输出的图像的质量较好。可以理解的是，摄像头越多，各摄像头之间的有效焦距的差值越小，则整个变焦过程中输出的图像质量越好。当各摄像头之间的有效焦距的差值较大时，可以采用多个处理后的图像合成后再输出，也可以使得变焦过程中输出的图像质量较好。
以上仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (10)

  1. 一种具有多摄像头的移动终端的拍摄方法，其特征在于，所述具有多摄像头的移动终端的拍摄方法包括以下步骤：
    当移动终端在根据第一摄像头拍得的第一图像而输出图像时，接收到以目标焦距放大输出图像的控制信息，则判断所述目标焦距是否小于、等于或大于第二摄像头的有效焦距，其中，所述第二摄像头的有效焦距大于所述第一摄像头的有效焦距；
    若小于，则对获取的所述第一图像进行数码变焦处理，获得并输出等效焦距为所述目标焦距的第一处理图像；
    若等于，则获取第二摄像头拍得的第二图像并输出；
    若大于，则对获取的所述第二图像进行数码变焦处理，获得并输出等效焦距为所述目标焦距的第二处理图像。
  2. 如权利要求1所述的具有多摄像头的移动终端的拍摄方法，其特征在于，所述移动终端将所述图像输出至显示屏、储存设备或外部设备上。
  3. 如权利要求1所述的具有多摄像头的移动终端的拍摄方法，其特征在于，在判定所述目标焦距大于所述第二摄像头的有效焦距之后，并在对获取的所述第二图像进行数码变焦处理的步骤之前，还包括步骤：
    判断所述目标焦距与所述第二摄像头的有效焦距的比值是否超过预设的阈值；
    若超过所述阈值，获得所述第一处理图像和第二处理图像，并将所述第一处理图像和第二处理图像合成后输出；
    若未超过阈值，则对获取的所述第二图像进行数码变焦处理，获得并输出等效焦距为所述目标焦距的第二处理图像。
  4. 如权利要求3所述的具有多摄像头的移动终端的拍摄方法，其特征在于，所述第二摄像头的有效焦距为第一摄像头的有效焦距的两倍，预设的所述阈值为2。
  5. 如权利要求3所述的具有多摄像头的移动终端的拍摄方法，其特征在于，所述终端还包括第三摄像头，在判定所述目标焦距大于所述第二摄像头的有效焦距之后，并在判断所述目标焦距与所述第二摄像头的有效焦距的比值是否超过预设的阈值的步骤之前，还包括步骤：
    移动终端判断所述目标焦距是否小于、等于或大于第三摄像头的有效焦距，其中，所述第三摄像头的有效焦距大于所述第二摄像头的有效焦距；
    若等于，则获取第三摄像头拍得的第三图像并输出；
    若大于，则输出第三处理图像或将所述第三处理图像与其他处理图像合成后输出，所述第三处理图像为根据所述第三图像获得的等效焦距为目标焦距的图像，所述其他处理图像是根据其他摄像头拍得的图像而获得的等效焦距为所述目标焦距的图像；
    若小于，则判断所述目标焦距与所述第二摄像头的有效焦距的比值是否超过预设的阈值。
  6. 一种移动终端，其特征在于，所述移动终端包括多摄像头，所述移动终端的各摄像头的有效焦距不同，所述移动终端还包括：
    第一判断模块，用于当移动终端在根据第一摄像头拍得的第一图像而输出时，接收到以目标焦距放大输出图像的控制信息，则判断所述目标焦距是否小于、等于或大于第二摄像头的有效焦距，其中，所述第二摄像头的有效焦距大于所述第一摄像头的有效焦距；
    第一放大模块，用于当第一判断模块判定为小于时，则对获取的所述第一图像进行数码变焦处理，获得并输出等效焦距为所述目标焦距的第一处理图像；
    第二直出模块，用于当第一判断模块判定为等于时，则获取第二摄像头拍得的第二图像并输出；
    第二放大模块，用于当第一判断模块判定为大于时，则对获取的所述第二图像进行数码变焦处理，获得并输出等效焦距为所述目标焦距的第二处理图像。
  7. 如权利要求6所述移动终端，其特征在于，所述移动终端将所述图像输出至显示屏、储存设备或外部设备上。
  8. 如权利要求7所述的移动终端，其特征在于，所述移动终端还包括：
    阈值模块，用于判断所述目标焦距与所述第二摄像头的有效焦距的比值是否超过预设的阈值；
    合成输出模块，用于当所述阈值模块判定超过所述阈值时，获得所述第一处理图像和第二处理图像，并将所述第一处理图像和第二处理图像合成后输出；
    所述第二放大模块还用于当所述阈值模块判定未超过所述阈值时，对获取的所述第二图像进行数码变焦处理，获得并输出等效焦距为所述目标焦距的第二处理图像。
  9. 如权利要求8所述移动终端，其特征在于，所述第二摄像头的有效焦距为第一摄像头的有效焦距的两倍，预设的所述阈值为2。
  10. 如权利要求8所述移动终端，其特征在于，所述移动终端还包括第三摄像头；所述移动终端还包括：
    第二判断模块，用于判断所述目标焦距是否小于、等于或大于第三摄像头的有效焦距，其中，所述第三摄像头的有效焦距大于所述第二摄像头的有效焦距；
    第三直出模块，用于当第二判断模块判定为等于时，则获取第三摄像头拍得的第三图像并输出；
    第三放大模块，用于当第二判断模块判定为大于时，则输出第三处理图像或将所述第三处理图像与其他处理图像合成后输出，所述第三处理图像为根据所述第三图像获得的等效焦距为目标焦距的图像，所述其他处理图像是根据其他摄像头拍得的图像而获得的等效焦距为所述目标焦距的图像；
    所述阈值模块还用于当第二判断模块判定为小于时，判断所述目标焦距与所述第二摄像头的有效焦距的比值是否超过预设的阈值。
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