CN104363379B - The method and terminal taken pictures using different focal camera - Google Patents

Abstract

The invention discloses a method and a terminal for taking pictures by using cameras with different focal lengths, which can still obtain high-quality images without adding lens modules. The method includes: before taking pictures, enabling the first camera to focus; according to the imaging effect of the first camera focusing, judging whether to enable the second camera to focus, the focal length of the second camera is smaller than the focal length of the first camera; When it is necessary to enable the second camera to focus, enable the second camera to focus; use the focused camera to shoot the focused object. Since the focal length of the second camera is smaller than the focal length of the first camera, when shooting close-up objects, you only need to enable the second camera to focus and shoot, not only can obtain high-quality photos, but also ensure that the lens does not protrude to the terminal In addition, the space of the lens module is reduced, so that the terminal to which the camera belongs can be made more ultra-thin and light, meeting the user's technological requirements for the terminal.

Description

Method and terminal for taking pictures with cameras with different focal lengths

technical field

The invention belongs to the field of image processing, and in particular relates to a method and a terminal for taking pictures using cameras with different focal lengths.

Background technique

The development of intelligent terminal technologies such as smartphones and tablet computers has made these terminals more and more powerful, far beyond the single function of communication. It is no exaggeration to say that smart terminals such as smartphones are no longer simple communication tools, but handicrafts that integrate leisure, entertainment and communication functions. For example, general smart phones are equipped with cameras to realize the functions of taking pictures and/or video recordings.

An important index to measure the shooting function of the above-mentioned smart terminal is the clarity of the image. According to the imaging principle in the optical field, a telephoto (or far-focus) camera can clearly capture distant objects. Therefore, in order to obtain high-definition images, existing smart terminals often use a telephoto camera to photograph objects that are far away.

Although the telephoto camera can capture objects at a longer distance, it is inconvenient to use the telephoto camera to capture objects at close range. This is because the effective focal length (Effective Focal Length, EFL) of the telephoto lens is longer, and a longer lens shift (lens shift) is required for close-up shooting, and the size of smart terminals such as mobile phones is limited, and this lens shift requires Smart terminals provide more space for lens modules. Under the trend that smart terminals need to be ultra-thin and lightweight, the above-mentioned prior art poses great challenges to the manufacturing process.

Contents of the invention

The invention provides a method and a terminal for taking pictures by using cameras with different focal lengths, which can still obtain high-quality images without adding lens modules.

The first aspect of the present invention provides a method for taking pictures using cameras with different focal lengths, including:

Before taking pictures, enable the first camera to focus;

According to the focusing imaging effect of the first camera, it is judged whether to enable the second camera to focus, and the focal length of the second camera is smaller than the focal length of the first camera;

When it is judged that the second camera needs to be enabled for focusing, enable the second camera for focusing;

Use the focused camera to shoot the focused object.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the determining whether to enable the second camera for focusing according to the imaging effect of the first camera focusing includes:

When the first camera focuses and the image is clear, calculate the distance between the focused object and the terminal to which the first camera or the second camera belongs;

According to the relationship between the distance and the preset threshold, it is judged whether to enable the second camera to focus.

With reference to the first possible implementation of the first aspect, in the second possible implementation of the first aspect, the determining whether to enable the second camera to focus according to the relationship between the distance and the preset threshold includes :

If the distance between the focused object and the terminal to which the first camera or the second camera belongs is not greater than the preset threshold, it is determined that the second camera needs to be enabled for focusing;

If the distance between the focused object and the terminal to which the first camera or the second camera belongs is greater than the preset threshold, it is determined that the second camera does not need to be enabled for focusing, and it is determined that the first camera needs to be enabled for focusing .

With reference to the first possible or second possible implementation of the first aspect, in a third possible implementation of the first aspect, the preset threshold is set by the distance of the focused object when the image of the first camera is clear. The maximum value of the first camera mentioned above.

With reference to the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the preset threshold is 0.5 meters.

The second aspect of the present invention provides a terminal that uses cameras with different focal lengths to take pictures, including:

The first camera enabling module is used to enable the first camera to focus before taking pictures;

The first judging module is configured to judge whether to enable the second camera to focus according to the imaging effect of the first camera focusing, and the focal length of the second camera is smaller than the focal length of the first camera;

The second camera enabling module is used to enable the second camera to focus when it is judged that the second camera needs to be enabled for focusing;

The first camera and the second camera are used to shoot the focused object after focusing.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the first judging module includes:

An object distance calculation unit, configured to calculate the distance between the focused object and the terminal to which the first camera or the second camera belongs when the image is clear when the first camera focuses;

The second judging unit is configured to judge whether to activate the second camera for focusing according to the relationship between the distance calculated by the object distance computing unit and a preset threshold.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the second judging unit includes:

The first determining unit is configured to determine that the second camera needs to be activated if the distance between the focused object and the terminal to which the first camera or the second camera belongs calculated by the object distance calculation unit is not greater than the preset threshold. Two cameras for focusing;

The second determination unit is configured to determine that it is not necessary to enable the second camera if the distance between the focused object and the terminal to which the first camera or the second camera belongs calculated by the object distance calculation unit is greater than the preset threshold. The camera is focused, and it is determined that the first camera needs to be enabled to focus.

With reference to the first possible or second possible implementation of the second aspect, in a third possible implementation of the second aspect, the preset threshold is determined by the distance of the focused object when the image of the first camera is clear. The maximum value of the first camera mentioned above.

With reference to the third possible implementation manner of the second aspect, in a fourth possible implementation manner of the second aspect, the preset threshold is 0.5 meters.

It can be seen from the above-mentioned embodiments of the present invention that, unlike the prior art that uses a telephoto camera to shoot an object that is far away from the object, the present invention determines according to the focus of the first camera, that is, the imaging effect of the telephoto camera, after the first camera is enabled for focusing. Whether to use the second camera to focus. Since the focal length of the second camera is smaller than the focal length of the first camera, when shooting close-up objects, only need to enable the second camera to focus and shoot, not only can obtain high-quality photos, but also ensure that the lens does not protrude to the terminal In addition, the space of the lens module is reduced, so that the terminal to which the camera belongs can be made more ultra-thin and light, meeting the user's technological requirements for the terminal.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is a schematic diagram of the implementation flow of the method for taking pictures using cameras with different focal lengths provided by Embodiment 1 of the present invention;

Fig. 2 is a schematic diagram of the implementation flow of the method for taking pictures using cameras with different focal lengths provided by Embodiment 2 of the present invention;

FIG. 3 is a schematic structural diagram of a terminal using cameras with different focal lengths to take pictures according to Embodiment 3 of the present invention;

FIG. 4 is a schematic structural diagram of a terminal using cameras with different focal lengths to take pictures according to Embodiment 4 of the present invention;

FIG. 5 is a schematic structural diagram of a terminal that uses cameras with different focal lengths to take pictures according to Embodiment 5 of the present invention.

detailed description

In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

An embodiment of the present invention provides a method for taking pictures using cameras with different focal lengths. The method includes: before starting to take pictures, enabling the first camera to focus; and judging whether to enable the second camera according to the focusing imaging effect of the first camera For focusing, the focal length of the second camera is smaller than the focal length of the first camera; when it is judged that the second camera needs to be enabled for focusing, enable the second camera for focusing; use the focused camera to shoot the focused object. Embodiments of the present invention also provide corresponding terminals that use cameras with different focal lengths to take pictures. Each will be described in detail below.

Please refer to FIG. 1 , which is the implementation process of the method for taking pictures with cameras with different focal lengths provided by Embodiment 1 of the present invention. The execution subject may be a terminal with a camera, for example, a smart terminal such as a smart phone or a tablet computer. The method for taking pictures using cameras with different focal lengths illustrated in accompanying drawing 1 mainly includes the following steps S101 to S104:

S101, before starting to take pictures, enable the first camera to focus.

Generally, for a terminal with a camera, the camera at least has a digital focusing function. The so-called digital focus is to increase the area of each pixel in the photo through the processor inside the terminal, so as to achieve the purpose of magnification. This method is like using image processing software to enlarge the area of a photo, but the program is carried out in the terminal, and a part of the pixels on the original CCD image sensor is enlarged by means of interpolation processing, thereby enlarging the image to the entire image.

In the embodiment of the present invention, if the first camera has an optical focus function, the optical focus may be used when the first camera is enabled for focusing. If the first camera does not have an optical focus function, digital focus may be used when the first camera is enabled for focusing. On the premise of ensuring clear imaging, the present invention does not limit the focusing method.

S102. According to the focusing imaging effect of the first camera, determine whether to enable the second camera for focusing, where the focal length of the second camera is smaller than the focal length of the first camera.

In the embodiment of the present invention, according to the imaging effect, it can be determined to use one of the two cameras, that is, the first camera and the second camera, to shoot the focused object; the focal length of the second camera is smaller than the focal length of the first camera, or, The field angle of the second camera is larger than the field angle of the first camera.

S103. When it is judged that the second camera needs to be enabled for focusing, enable the second camera for focusing.

S104, using the focused camera to shoot the focused object.

In the implementation example of the present invention, if it is determined through step S103 that the second camera needs to be activated for focusing, then after enabling the second camera for focusing, the second camera is used to capture the object to be focused; otherwise, the first camera enabled in step S101 is still used Shoot the focused object.

It can be known from the method of taking pictures with cameras with different focal lengths in the example of the accompanying drawing 1 that, unlike the prior art that uses a telephoto camera to shoot objects far away from the object, in the present invention, after the first camera is enabled to focus, the first camera is used to focus. That is, the imaging effect of the telephoto camera determines whether to use the second camera to focus. Since the focal length of the second camera is smaller than the focal length of the first camera, when shooting close-up objects, only need to enable the second camera to focus and shoot, not only can obtain high-quality photos, but also ensure that the lens does not protrude to the terminal In addition, the space of the lens module is reduced, so that the terminal to which the camera belongs can be made more ultra-thin and light, meeting the user's technological requirements for the terminal.

Please refer to FIG. 2 , which is the implementation flow of the method for taking pictures with cameras with different focal lengths provided by Embodiment 2 of the present invention. Similar to the method illustrated in FIG. 1 , the execution subject of the method illustrated in FIG. 2 may also be a terminal with a camera, for example, a smart terminal such as a smart phone or a tablet computer. The method for taking pictures using cameras with different focal lengths illustrated in accompanying drawing 2 mainly includes the following steps S201 to S205:

S201. Before taking pictures, enable the first camera to focus.

Generally, for a terminal with a camera, the camera at least has a digital focusing function. The so-called digital focus is to increase the area of each pixel in the photo through the processor inside the terminal, so as to achieve the purpose of magnification. This method is like using image processing software to enlarge the area of a photo, but the program is carried out in the terminal, and a part of the pixels on the original CCD image sensor is enlarged by means of interpolation processing, thereby enlarging the image to the entire image.

In the embodiment of the present invention, if the first camera has an optical focus function, the optical focus may be used when the first camera is enabled for focusing. If the first camera does not have an optical focus function, digital focus may be used when the first camera is enabled for focusing. On the premise of ensuring clear imaging, the present invention does not limit the focusing method.

S202. When the first camera focuses and the image is clear, calculate the distance between the focused object and the terminal to which the first camera or the second camera belongs.

Since the first camera and the second camera are on the same plane, the distance between the focused object and the terminal to which the first camera belongs is equal to the distance between the focused object and the terminal to which the second camera belongs. In the embodiment of the present invention, the distance between the focused object and the terminal to which the first camera or the second camera belongs is the object distance in the field of image processing. According to the relationship between object distance, image distance and focal length, that is, 1/u+1/v=1/f, where u is the object distance, v is the image distance, and f is the focal length. On the premise of known image distance and focal length, Object distance can be calculated.

S203, according to the relationship between the distance calculated in step S202 and the preset threshold, determine whether to enable the second camera to focus.

Specifically, according to the relationship between the distance calculated in step S202 and the preset threshold, judging whether to enable the second camera for focusing may be: if the distance between the focused object and the first camera or the terminal to which the second camera belongs is not greater than the preset threshold, Then it is determined that the second camera needs to be enabled for focusing; if the distance between the focused object and the first camera or the terminal to which the second camera belongs is greater than a preset threshold, it is determined that it is not necessary to enable the second camera for focusing, and it is determined that the first camera needs to be enabled for focusing .

S204. When it is judged that the second camera needs to be enabled for focusing, enable the second camera for focusing.

S205, using the focused camera to shoot the focused object.

In the implementation example of the present invention, if it is determined through steps S202 and S203 that it is necessary to enable the second camera to focus, then use the second camera to capture the focused object after enabling the second camera for focusing; otherwise, still use the method enabled in step S201 The first camera shoots the focused object.

It should be noted that, in the above-mentioned method of taking pictures with cameras with different focal lengths illustrated in FIG. 1 or FIG. 2 , the preset threshold may be the maximum distance from the focused object to the first camera when the imaging of the first camera is clear, that is, If the distance between the focused object and the first camera exceeds the maximum value, the image of the first camera will no longer be clear. As an embodiment of the present invention, the preset threshold may be 0.5 meters.

Please refer to FIG. 3 , which is a schematic structural diagram of a terminal using cameras with different focal lengths to take pictures according to Embodiment 3 of the present invention. For ease of description, only parts related to the embodiments of the present invention are shown. The terminal that uses cameras with different focal lengths to take pictures illustrated in FIG. 3 may be the subject of execution of the method for taking pictures with cameras with different focal lengths provided in the foregoing embodiments, and it may be a terminal, such as a smart phone, a tablet computer, and the like. The terminal that uses cameras with different focal lengths to take pictures as illustrated in Figure 3 mainly includes a first camera activation module 301, a first judgment module 302, a second camera activation module 303, a first camera 304, and a second camera 305. The detailed descriptions of each functional module are as follows :

The first camera enabling module 301 is configured to enable the first camera 304 to focus before taking pictures.

Generally, for a terminal with a camera, the camera at least has a digital focusing function. The so-called digital focus is to increase the area of each pixel in the photo through the processor inside the terminal, so as to achieve the purpose of magnification. This method is like using image processing software to enlarge the area of a photo, but the program is carried out in the terminal, and a part of the pixels on the original CCD image sensor is enlarged by means of interpolation processing, thereby enlarging the image to the entire image.

In the embodiment of the present invention, if the first camera has an optical focusing function, when the first camera enabling module 301 enables the first camera to focus, optical focusing may be used. If the first camera does not have an optical focusing function, digital focusing may be used when the first camera enabling module 301 enables the first camera to focus. On the premise of ensuring clear imaging, the present invention does not limit the focusing method.

The first judging module 302 is configured to judge whether to use the second camera for focusing according to the imaging effect of the first camera 304 , and the focal length of the second camera 305 is smaller than that of the first camera 304 .

The second camera activating module 303 is configured to enable the second camera 305 to focus when it is judged that the second camera 305 needs to be activated to focus.

The first camera 304 and the second camera 305 are used to shoot the focused object after focusing.

In the implementation example of the present invention, if it is judged by the first judging module 302 that the second camera 305 needs to be enabled to focus, then the second camera enabling module 303 enables the second camera 305 to focus, and the second camera 305 shoots the focused object, otherwise , using the first camera 304 enabled by the first camera enabling module 301 to photograph the focused object.

It should be noted that, in the embodiment of the terminal using cameras with different focal lengths to take pictures as exemplified in Fig. 3 above, the division of each functional module is only an example. In consideration of convenience, the above function allocation is completed by different functional modules, that is, the internal structure of the terminal that uses cameras with different focal lengths to take pictures is divided into different functional modules to complete all or part of the functions described above. Moreover, in practical applications, the corresponding functional modules in this embodiment can be implemented by corresponding hardware, or can be completed by corresponding hardware executing corresponding software. For example, the aforementioned first judgment module can be implemented based on the aforementioned The imaging effect of the first camera focusing, judging whether it is necessary to enable the hardware for focusing the second camera, such as the first judger, can also be a general processor or other hardware device capable of executing a corresponding computer program to complete the aforementioned functions; again as mentioned above The module for enabling the second camera may be the hardware for enabling the second camera to focus when the first judging module (or the first judging device) judges that the second camera needs to be enabled for focusing, such as a second camera enabler. It may be a general processor or other hardware device capable of executing corresponding computer programs to complete the aforementioned functions (the above described principles can be applied to all the embodiments provided in this specification).

The first judging module 302 illustrated in FIG. 3 may include an object distance calculation unit 401 and a second judging unit 402. As shown in FIG. 4, a terminal using cameras with different focal lengths to take pictures is provided in Embodiment 4 of the present invention, wherein:

The object distance calculation unit 401 is configured to calculate the distance between the focused object and the terminal to which the first camera 304 or the second camera 305 belongs when the image of the first camera 304 is in focus.

Since the first camera and the second camera are on the same plane, the distance between the focused object and the terminal to which the first camera belongs is equal to the distance between the focused object and the terminal to which the second camera belongs. In the embodiment of the present invention, the distance between the focused object and the terminal to which the first camera or the second camera belongs is the object distance in the field of image processing. According to the relationship between object distance, image distance and focal length, that is, 1/u+1/v=1/f, where u is the object distance, v is the image distance, and f is the focal length. On the premise of known image distance and focal length, The object distance calculation unit 401 may calculate the object distance, that is, the distance between the focused object and the terminal to which the first camera 304 or the second camera 305 belongs.

The second judging unit 402 is configured to judge whether to enable the second camera 305 to focus according to the relationship between the distance calculated by the object distance calculating unit 401 and the preset threshold.

The second judging unit 402 illustrated in FIG. 4 may include a first determining unit 501 and a second determining unit 502. As shown in FIG. 5, a terminal using cameras with different focal lengths to take pictures is provided in Embodiment 5 of the present invention, wherein:

The first determination unit 501 is configured to determine that the second camera 305 needs to be activated for focusing if the distance between the object to be focused and the terminal to which the first camera 304 or the second camera 305 belongs calculated by the object distance calculation unit 401 is not greater than a preset threshold.

The second determining unit 503 is configured to determine that it is not necessary to activate the second camera 305 for focusing if the distance between the focused object calculated by the object distance calculation unit 402 and the terminal to which the first camera 304 or the second camera 305 belongs is greater than a preset threshold, and It is determined that the first camera 304 needs to be enabled for focusing.

In the terminal that uses cameras with different focal lengths to take pictures as illustrated in Figure 4 or Figure 5 above, the preset threshold may be the maximum distance between the focused object and the first camera when the image of the first camera is clear, that is, the distance between the focused object and the first camera If the distance of the first camera exceeds the maximum value, the image of the first camera will no longer be clear. As an embodiment of the present invention, the preset threshold may be 0.5 meters.

It should be noted that the information interaction and execution process between the modules/units of the above-mentioned device are based on the same idea as the method embodiment of the present invention, and the technical effect it brings is the same as that of the method embodiment of the present invention. The specific content can be Refer to the descriptions in the method embodiments of the present invention, and details are not repeated here.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.

If the functions described above are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes. .

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (8)

1. a kind of method that use different focal camera is taken pictures, it is characterised in that methods described includes：

Before beginning of taking pictures, enable the first camera and focused；

According to the imaging effect of first camera focusing, judge whether to need to enable second camera and focused, it is described Focal length of the focal length of second camera less than first camera；

When judging to need to enable second camera focusing, enable the second camera and focused；

Object is focused using being shot to defocused camera；

The imaging effect according to first camera focusing, judges whether to need to enable second camera and is focused, Including：

In the first camera focusing during imaging clearly, calculating is focused object with first camera or second camera The distance of affiliated terminal；

According to the relation of the distance and predetermined threshold value, judge whether to need to enable second camera and focused.

2. the method for claim 1, it is characterised in that described according to the distance and the relation of predetermined threshold value, judges Whether need to enable second camera and focused, including：

If it is described be focused object be not more than with the distance of first camera or the affiliated terminal of second camera it is described pre- If threshold value, it is determined that need to enable the second camera and focused；

If the object that is focused is default more than described with the distance of first camera or the affiliated terminal of second camera Threshold value, it is determined that focused without enabling the second camera, and determine to need to enable first camera carry out it is right It is burnt.

3. method as claimed in claim 1 or 2, it is characterised in that the predetermined threshold value is first camera in imaging The maximum of the first camera described in object distance is focused when clear.

4. method as claimed in claim 3, it is characterised in that the predetermined threshold value is 0.5 meter.

5. the terminal that a kind of use different focal camera is taken pictures, it is characterised in that the terminal includes：

First camera enables module, for before beginning of taking pictures, enabling the first camera and being focused；

First judge module, for the imaging effect according to first camera focusing, judges whether to need to enable second and takes the photograph As head is focused, the focal length of the focal length less than first camera of the second camera；

Second camera enables module, for when the first judge module judges to need to enable second camera focusing, enabling institute Second camera is stated to be focused；

First camera and second camera, for being focused object to defocused shooting；

First judge module includes：

Object distance computing unit, in the first camera focusing, during imaging clearly, calculating is focused object and is taken the photograph with described first As head or the distance of the affiliated terminal of second camera；

Second judging unit, for the distance and the relation of predetermined threshold value that are calculated according to the object distance computing unit, judges Whether need to enable second camera and focused.

6. terminal as claimed in claim 5, it is characterised in that second judging unit includes：

First determining unit, if calculating be focused object with first camera described in gained for the object distance computing unit Or the distance of the affiliated terminal of second camera is not more than the predetermined threshold value, it is determined that need to enable the second camera and Row focusing；

Second determining unit, if calculating be focused object with first camera described in gained for the object distance computing unit Or the distance of the affiliated terminal of second camera is more than the predetermined threshold value, it is determined that carried out without enabling the second camera Focusing, and determine to need to enable first camera to be focused.

7. the terminal as described in claim 5 or 6, it is characterised in that the predetermined threshold value is first camera in imaging The maximum of the first camera described in object distance is focused when clear.

8. terminal as claimed in claim 7, it is characterised in that the predetermined threshold value is 0.5 meter.