CN104333701B - Method and device for displaying camera preview pictures as well as terminal - Google Patents

Abstract

The present invention is applicable to the technical field of terminals, and provides a camera preview screen display method, device and terminal, including: transmitting the screen captured by the first camera to the display screen of the terminal in real time as the first preview screen; detecting the preview screen The focus object in the picture; make the second camera zoom to the focus object area, generate a second preview picture according to the picture captured by the second camera in real time; synthesize the second preview picture into the first preview picture In the specified pixel area, it is simultaneously displayed on the display screen of the terminal. The present invention can present the picture-in-picture effect on the terminal display screen during the photographing process, display the entire photographing scene and the focused object at the same time, realize the detailed preview of the focused object, prevent the photographs of the focused object from taking poor performance, and avoid Waste of time and system resources.

Description

Method, device and terminal for displaying camera preview screen

technical field

The invention belongs to the technical field of terminals, and in particular relates to a display method, device and terminal of a camera preview screen.

Background technique

At present, the camera function has become one of the essential functions of consumer electronic products such as mobile phones. Users have become accustomed to using mobile phones to record and share life images anytime and anywhere, and enjoy the fun brought by digital life.

Due to the limitation of the display size of the mobile phone, the user cannot clearly see the details of the focused object when taking pictures through the mobile phone. For example, if you take a picture of a traveler standing in the vast grassland with a mobile phone, and the focus object is the face of the traveler, then the photographer cannot actually see the facial expression of the traveler clearly through the preview screen of the shooting scene displayed on the mobile phone display , In this way, it may happen that the photo is taken when the traveler blinks, resulting in unsatisfactory photo effects, waste of time for taking pictures, and waste of mobile phone system resources and energy consumption.

Contents of the invention

The purpose of the embodiments of the present invention is to provide a method, device and terminal for displaying a preview image of a camera, aiming at solving the problem that the display screen of the mobile phone cannot preview the details of the focused object when taking pictures with a mobile phone at this stage.

In the first aspect, a method for displaying a camera preview image is provided, including: transmitting the image captured by the first camera to the display screen of the terminal in real time as the first preview image; detecting the focused object in the preview image; The second camera zooms to the focused object area, and generates a second preview picture according to the picture captured by the second camera in real time; the second preview picture is synthesized into the specified pixel area of the first preview picture, and is displayed on the terminal's The display shows at the same time.

In a first possible implementation manner of the first aspect, the synthesizing the second preview image into a specified pixel area of the first preview image includes: acquiring an image resolution of the specified pixel area; After the second preview image is compressed to the image resolution, it is overlaid on the designated pixel area.

In a second possible implementation manner of the first aspect, the zooming the second camera to the focused object area, and generating the second preview picture according to the picture captured by the second camera in real time includes: acquiring the specified The image resolution of the pixel area; adjusting the imaging resolution of the second camera to the size of the image resolution; making the second camera zoom to the focus object, and generating according to the picture captured by the second camera in real time The second preview frame of the image resolution size.

In a third possible implementation manner of the first aspect, the position of the specified pixel area in the first preview image includes: an upper left corner, an upper right corner, a lower left corner, or a lower right corner of the first preview image.

With reference to the first aspect or any possible implementation manner of the first aspect, in a fourth possible implementation manner, the method further includes: detecting dragging of the second preview image on the display screen of the terminal Operation: Acquire the drag track and end position of the drag operation; move the second preview image along the drag track, and finally cover the pixel area where the end position is located.

In a second aspect, a display device for a camera preview image is provided, including: a first display unit configured to transmit the image captured by the first camera to the display screen of the terminal in real time as the first preview image; a first detection unit, For detecting the focused object in the preview image; a generating unit, configured to zoom the second camera to the focused object area, and generate a second preview image according to the real-time captured image of the second camera; the second display unit, It is used to synthesize the second preview image into the specified pixel area of the first preview image, and simultaneously display it on the display screen of the terminal.

In a first possible implementation manner of the second aspect, the second display unit includes: a first acquiring subunit, configured to acquire the image resolution of the designated pixel area; a covering subunit, configured to After the second preview image is compressed to the image resolution, it is overlaid on the specified pixel area.

In a second possible implementation manner of the second aspect, the generation unit includes: a second acquisition subunit, configured to acquire the image resolution of the specified pixel area; an adjustment subunit, configured to convert the second The imaging resolution of the camera is adjusted to the image resolution size; the shooting subunit is used to make the second camera zoom to the focus object, and generate the image resolution size according to the picture captured by the second camera in real time The second preview screen of .

In a third possible implementation manner of the second aspect, the position of the specified pixel area in the first preview image includes: an upper left corner, an upper right corner, a lower left corner, or a lower right corner of the first preview image.

With reference to the second aspect or any possible implementation manner of the second aspect, in a fourth possible implementation manner, the device further includes: a second detection unit, configured to detect, on a display screen of the terminal, the The drag operation of the second preview image; the acquiring unit, configured to acquire the drag track and the termination position of the drag operation; the third display unit, configured to move the second preview image along the drag track , and finally cover the pixel area where the end position is located.

In a third aspect, a terminal is provided, and the terminal includes the device for displaying a preview image of a camera as described above.

In a first possible implementation manner of the third aspect, the terminal includes a smart phone or a tablet.

The embodiment of the present invention can present a picture-in-picture effect on the display screen of the terminal during the photographing process, display the entire photographing scene and the focused object at the same time, realize the detailed preview of the focused object, and prevent the shooting of poorly performing photos of the focused object , avoiding the waste of time and system resources.

Description of drawings

FIG. 1 is a flow chart of an implementation of a method for displaying a camera preview screen provided by an embodiment of the present invention;

Fig. 2 is an example diagram of positions of a first camera and a second camera provided by an embodiment of the present invention;

Fig. 3 is an example diagram of a first preview screen and a second preview screen provided by an embodiment of the present invention;

Fig. 4 is a synthetic effect diagram of the first preview image and the second preview image provided by the embodiment of the present invention;

FIG. 5 is a specific implementation flowchart of the method S104 for displaying a camera preview screen provided by an embodiment of the present invention;

FIG. 6 is a flow chart of a specific realization of the camera preview image display method S104 provided by another embodiment of the present invention;

Fig. 7 is a flow chart of realizing a method for displaying a camera preview screen provided by another embodiment of the present invention;

FIG. 8 is a schematic diagram of a drag operation on a second preview image provided by an embodiment of the present invention;

9 is a structural block diagram of a display device for a camera preview screen provided by an embodiment of the present invention;

Fig. 10 is a block diagram of a partial structure of a mobile phone related to a terminal provided by an embodiment of the present invention.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The method and device for displaying a camera preview screen provided by the embodiments of the present invention can be applied to terminal devices integrating a camera and a display screen, including smart phones, tablets, PDAs (Personal Digital Assistant, PDA), cameras, and the like. Among them, the camera in the terminal is used to realize the function of taking pictures and recording video, and the display screen is used to realize the preview function of the shooting picture, that is, the picture currently received by the camera is displayed in real time for the user to preview, so as to achieve the function of the viewfinder. Effect.

Fig. 1 shows the implementation process of the method for displaying the camera preview screen provided by the embodiment of the present invention, which is described in detail as follows:

In S101, a picture captured by a first camera is transmitted to a display screen of a terminal in real time as a first preview picture.

In this embodiment, the process running on the operating system of the terminal is monitored. When it is detected that the "camera" application in the operating system is called to run in the foreground, the first camera of the terminal is first started, and the first camera is imaged. The screen is output to the display screen of the terminal in real time and displayed as a preview screen.

Specifically, the picture captured by the first camera generates an optical image through its lens, and then projects it on the sensor, then the optical image is converted into an electrical signal, and the electrical signal is converted into a digital signal through analog-to-digital conversion, and the digital signal is processed by DSP , and then sent to the terminal processor for processing, and finally output to the display screen of the terminal, becoming a real-time preview screen that the user can see.

In S102, a focused object in the preview image is detected.

When the focus command is issued, the focus object indicated by the focus command in the preview screen is detected, and once the focus command is issued, the first camera performs the focus operation on the determined focus object according to the normal processing flow, adjusts the focal length, and sets the focus Fall on the focused object to make the image of the focused object clear.

The issuing of the focusing instruction may at least include the following two methods: the user clicks on the scene in the preview screen on the display screen with touch function, and selects the subject to be focused; mode, when the camera button is tapped, the focus command is automatically issued, wherein the focus mode includes but not limited to: center focus, designated area focus, etc., correspondingly, the focus object is the subject located in the center of the preview screen , when the specified area is focused, the focus object is the subject located in the specified area of the preview screen.

In S103, the second camera is made to zoom to the focused object area, and a second preview image is generated according to the images captured by the second camera in real time.

In this embodiment, the terminal has two cameras at the same time, and the first camera and the second camera are located on the same side panel of the terminal. Preferably, the first camera and the second camera can be adjacent, Cameras located on the same shooting plane. FIG. 2 shows a specific implementation manner in which the first camera 21 and the second camera 22 are configured on a mobile phone 23 as an implementation example.

The second camera can be started simultaneously with the first camera when it is detected that the "camera" application in the operating system is called to run in the foreground, or it can be started after S102 detects the focused object in the preview image.

After the second camera is started, it takes the focused object as the main body, performs a zoom operation within its zoom range, changes the focal length of its lens, and achieves the effect of zooming in on the focused object. Wherein, the zoom mode of the second camera can be digital zoom or optical zoom, and the zoom range, that is, the focal length range of the lens of the second camera itself, represents the size of the visible range of the lens, and the larger the focal length, the wider the visible range. Conversely, the smaller the focal length, the larger the visible range. For example, for an 18-135mm zoom lens, the focal length of the wide-angle segment (that is, the case with the largest viewing range) is 18mm, and the focal length of the narrow-angle segment (that is, the case with the smallest viewing range) is 135mm. In this embodiment, the second camera zooms to the focused object area. In a general sense, the second camera zooms to a position with a larger focal length, so that the visible range is only locked in the focused object area, achieving The effect of zooming in on a focused object.

As an implementation example of the present invention, FIG. 3 shows an example diagram of a first preview image and a second preview image at the same moment, wherein the second preview image shows the focus object selected in the first preview image.

In S104, the second preview image is synthesized into the designated pixel area of the first preview image, and simultaneously displayed on the display screen of the terminal.

In this embodiment, the second preview image is superimposed on the first preview image, and covers the pixels in the designated pixel area of the first preview image, thereby obtaining the effect of synthesizing the first preview image and the second preview image, and The output is displayed on the display screen of the terminal. In order to achieve a better composite display effect and avoid the main content of the second preview image being covered, in this embodiment, the specified pixel area should only be a part of the pixel area of the first preview image. Preferably, the specified pixel area is only Occupies one-ninth of the first preview screen.

Wherein, the position of the designated pixel area in the first preview image includes:

The upper left corner, the upper right corner, the lower left corner or the lower right corner of the first preview image, and the combined display effect of the first preview image and the second preview image corresponding to the above positions are shown in FIG. 4 .

Through the display method of the photo preview screen provided by the embodiment shown in Figure 1, the effect of picture-in-picture can be presented on the terminal display screen during the photo taking process, and the entire photo scene and the focused object can be displayed at the same time, so as to realize the display of the focused object Detail preview prevents taking pictures of poorly focused objects and avoids wasting time and system resources.

As a further explanation of the embodiment shown in FIG. 1, the implementation method of synthesizing the second preview image into the first preview image will be specifically described through several embodiments below:

As an embodiment of the present invention, after the second preview image is generated, the preview image can be processed so that it can be effectively synthesized into the first preview image. As shown in Figure 5, in this embodiment, S104 is specifically:

S501. Acquire the image resolution of the specified pixel area.

The image resolution of the specified pixel area is the number of pixels contained in the specified pixel area. For example, an image resolution of 1024*768 means that each horizontal line of the image contains 1024 pixels, and there are 768 horizontal lines in total.

Since the specified pixel area is known, the image resolution of this area can be pre-stored in the database, and the image resolution of the specified pixel area can be obtained by calling the database when executing S501.

S502. After compressing the second preview image to the image resolution, overlay it on the designated pixel area.

Compress the second preview image captured by the second camera to the image resolution size of the specified pixel area, so that it can be accommodated in the specified pixel area, so as to just cover the specified pixel area.

As another embodiment of the present invention, the second preview image can be generated directly according to the image resolution of the specified pixel area, so that it can be effectively synthesized into the first preview image. As shown in Figure 6, in this embodiment, S104 is specifically:

S601. Acquire the image resolution of the specified pixel area.

The manner of acquiring the image resolution of the specified pixel area may be as described in the embodiment S501 of FIG. 5 .

S602. Adjust the imaging resolution of the second camera to the size of the image resolution.

S603. Make the second camera zoom to the focused object, shoot and generate the second preview image with the image resolution size.

In S602, the imaging resolution of the image captured by the second camera is directly adjusted to the image resolution of the specified pixel area. In this way, the picture captured by the second camera in S603 will be directly output according to the image resolution. Since the resolution of the specified pixel area is usually smaller than the maximum resolution that the second camera can image, so compared with the embodiment shown in FIG. Shooting can effectively save terminal flash memory space and system resources.

Generally speaking, the aspect ratio of the images captured by the first camera and the second camera are the same, therefore, the images captured by the second camera can be directly compressed to match the image resolution size, and if once If the aspect ratios of the images captured by the first camera and the second camera do not match, it is still necessary to ensure that the compressed second preview image can be accommodated in the specified pixel area, so as to ensure that the second preview image does not The images outside the specified pixel area of the first preview image will be blocked, and the remaining areas within the specified pixel area can be filled with black pixels or pixels of other gray values.

As an embodiment of the present invention, after the second preview image is combined with the first preview image, in order to ensure that all the contents of the first preview image can be displayed, the second preview image can be dragged, and the second Drag the preview image to other pixel areas of the first preview image to flexibly adjust the position occupied by the second preview image. As shown in FIG. 7, after S104, the method further includes:

In S701, a drag operation on the second preview image is detected on a display screen of a terminal.

In S702, a drag track and an end position of the drag operation are obtained.

Wherein, the dragging operation can be implemented in a display screen integrated with a touch panel. The dragging operation takes the specified pixel area as the starting position, and obtains the dragging operation by detecting the sliding track of the user's finger on the display screen. The drag trajectory and end position of the operation.

In S703, move the second preview image along the dragging track, and finally cover the pixel area where the ending position is located.

Wherein, the pixel area where the end position is located is an area whose area is the size of the specified pixel area centered on the touch point at the end position.

Fig. 8 shows the drag track of the second preview image in one drag operation, by dragging the second preview image, the content of the part of the first preview image that is blocked by the second preview image can be displayed, ensuring the accuracy of the shooting scene All content can be displayed.

It should be understood that in the embodiment of the present invention, the sequence numbers of the above-mentioned processes do not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, rather than the implementation process of the embodiment of the present invention. constitute any limitation.

Corresponding to the method for previewing a photographing scene provided by an embodiment of the present invention, FIG. 9 shows a structural block diagram of a device for previewing a photographing scene provided by an embodiment of the present invention. The device can run on a terminal device that integrates a camera and a display screen. , such as smartphones, tablets, PDAs, cameras, etc. For ease of description, only the parts related to this embodiment are shown.

Referring to Figure 9, the device includes:

The first display unit 91 transmits the picture taken by the first camera to the display screen of the terminal in real time as the first preview picture.

The first detection unit 92 is configured to detect the focused object in the preview image.

The generation unit 93 is configured to make the second camera zoom to the focused object area, and generate a second preview image according to the images captured by the second camera in real time.

The second display unit 94 synthesizes the second preview image into the designated pixel area of the first preview image, and simultaneously displays it on the display screen of the terminal.

Optionally, the second display unit 94 includes:

The first acquiring subunit acquires the image resolution of the specified pixel area.

The overlay subunit compresses the second preview image to the image resolution and overlays it on the specified pixel area.

Optionally, the generating unit 93 includes:

The second acquiring subunit acquires the image resolution of the specified pixel area.

The adjustment subunit adjusts the imaging resolution of the second camera to the size of the image resolution.

The shooting subunit is configured to make the second camera zoom to the focused object, and generate the second preview picture with the image resolution size according to the picture captured by the second camera in real time.

Optionally, the position of the specified pixel area in the first preview image includes:

The upper left corner, upper right corner, lower left corner or lower right corner of the first preview image.

Optionally, the device also includes:

The second detecting unit is configured to detect a drag operation on the second preview image on the display screen of the terminal.

The acquisition unit is configured to acquire the drag track and the end position of the drag operation.

The third display unit moves the second preview image along the dragging track, and finally covers the pixel area where the ending position is located.

FIG. 10 is a block diagram showing a partial structure of a mobile phone related to a terminal provided by an embodiment of the present invention. Referring to FIG. 10 , the mobile phone includes: a radio frequency (Radio Frequency, RF) circuit 1010, a memory 1020, an input unit 1030, a display unit 1040, a first camera 1050, a second camera 1060, and a processor 1070. Those skilled in the art can understand that the structure of the mobile phone shown in FIG. 10 is not limited to the mobile phone, and may include more or less components than shown in the figure, or combine some components, or arrange different components.

The following is a specific introduction to each component of the mobile phone in conjunction with Figure 10:

The RF circuit 1010 can be used for sending and receiving information or receiving and sending signals during a call. In particular, after receiving the downlink information from the base station, it is processed by the processor 1070; in addition, the designed uplink data is sent to the base station. Generally, an RF circuit includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier (Low Noise Amplifier, LNA), a duplexer, and the like. In addition, RF circuitry 1010 may also communicate with networks and other devices via wireless communications. The above-mentioned wireless communication can use any communication standard or protocol, including but not limited to Global System of Mobile Communication (Global System of Mobile communication, GSM), General Packet Radio Service (General Packet Radio Service, GPRS), Code Division Multiple Access (Code Division Multiple Access) , CDMA), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE)), email, Short Messaging Service (SMS), etc.

The memory 1020 can be used to store software programs and modules, and the processor 1070 executes various functional applications and data processing of the mobile phone by running the software programs and modules stored in the memory 1020 . The memory 1020 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application program required by a function (such as a sound playback function, an image playback function, etc.); Data created by the use of mobile phones (such as audio data, phonebook, etc.), etc. In addition, the memory 1020 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage devices.

The input unit 1030 can be used to receive input numbers or character information, and generate key signal input related to user settings and function control of the mobile phone 1000 . Specifically, the input unit 1030 may include a touch panel 1031 and other input devices 1032 . The touch panel 1031, also referred to as a touch screen, can collect touch operations of the user on or near it (for example, the user uses any suitable object or accessory such as a finger or a stylus on the touch panel 1031 or near the touch panel 1031). operation), and drive the corresponding connection device according to the preset program. Optionally, the touch panel 1031 may include two parts, a touch detection device and a touch controller. Among them, the touch detection device detects the user's touch orientation, and detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into contact coordinates, and sends it to the to the processor 1070, and can receive and execute commands sent by the processor 1070. In addition, the touch panel 1031 can be implemented in various types such as resistive, capacitive, infrared, and surface acoustic wave. In addition to the touch panel 1031 , the input unit 1030 may also include other input devices 1032 . Specifically, other input devices 1032 may include, but are not limited to, one or more of physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, joysticks, and the like.

The display unit 1040 may be used to display information input by or provided to the user and various menus of the mobile phone. The display unit 1040 may include a display screen 1041. Optionally, the display screen 1041 may be configured in the form of a liquid crystal display (Liquid Crystal Display, LCD) or an organic light-emitting diode (Organic Light-Emitting Diode, OLED). Further, the touch panel 1031 may cover the display screen 1041, and when the touch panel 1031 detects a touch operation on or near it, it transmits to the processor 1070 to determine the type of the touch event, and then the processor 1070 determines the type of the touch event according to the The type provides a corresponding visual output on the display screen 1041 . Although in FIG. 10 , the touch panel 1031 and the display screen 1041 are used as two independent components to realize the input and input functions of the mobile phone, in some embodiments, the touch panel 1031 and the display screen 1041 can be integrated and Realize the input and output functions of the mobile phone.

The processor 1070 is the control center of the mobile phone. It uses various interfaces and lines to connect various parts of the entire mobile phone. By running or executing software programs and/or modules stored in the memory 1020, and calling data stored in the memory 1020, execution Various functions and processing data of the mobile phone, so as to monitor the mobile phone as a whole. Optionally, the processor 1070 may include one or more processing units; preferably, the processor 1070 may integrate an application processor and a modem processor, wherein the application processor mainly processes operating systems, user interfaces, and application programs, etc. , the modem processor mainly handles wireless communications. It can be understood that the foregoing modem processor may not be integrated into the processor 1070 .

Although not shown, the mobile phone 1000 may also include a power supply, a wireless module, a Bluetooth module, an audio circuit, a sensor, etc., which will not be repeated here.

In the embodiment of the present invention, the processor 1070 included in the terminal also has the following functions: a method for displaying a camera preview image, including:

The picture captured by the first camera is transmitted to the display screen of the terminal in real time as the first preview picture;

Detecting a focused object in the preview image;

Make the second camera zoom to the focus object area, and generate a second preview picture according to the picture captured by the second camera in real time;

Synthesizing the second preview image into the specified pixel area of the first preview image and simultaneously displaying it on the display screen of the terminal.

Further, the synthesizing the second preview image into the specified pixel area of the first preview image includes:

Obtain the image resolution of the specified pixel area;

After the second preview image is compressed to the image resolution, it is overlaid on the specified pixel area.

Further, the zooming of the second camera to the focused object area, and generating a second preview image according to the real-time captured images of the second camera include:

Obtain the image resolution of the specified pixel area;

adjusting the imaging resolution of the second camera to the size of the image resolution;

making the second camera zoom to the focus object, and generating the second preview picture with the image resolution size according to the picture captured by the second camera in real time.

Further, the position of the specified pixel area in the first preview image includes:

The upper left corner, upper right corner, lower left corner or lower right corner of the first preview image.

Further, the method also includes:

Detecting a drag operation on the second preview image on a display screen of the terminal;

Obtain the drag track and end position of the drag operation;

The second preview image is moved along the dragging track, and finally covered on the pixel area where the ending position is located.

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 (12)

1. A method for displaying a camera preview image, comprising: Transmitting the picture taken by the first camera of the terminal to the display screen of the terminal in real time as the first preview picture; When the focus instruction is issued, detect the focus object in the preview image; making the second camera of the terminal zoom to the focus object area to zoom in on the focus object, and generate a second preview picture according to the picture captured by the second camera in real time; Synthesizing the second preview image into the specified pixel area of the first preview image and simultaneously displaying it on the display screen of the terminal. 2. The method according to claim 1, wherein the synthesizing the second preview image into the designated pixel area of the first preview image comprises: Obtain the image resolution of the specified pixel area; After the second preview image is compressed to the image resolution, it is overlaid on the designated pixel area. 3. The method according to claim 1, wherein the step of zooming the second camera to the focused object area, and generating a second preview image according to the real-time captured images of the second camera comprises: Obtain the image resolution of the specified pixel area; adjusting the imaging resolution of the second camera to the size of the image resolution; making the second camera zoom to the focus object, and generating the second preview picture with the image resolution size according to the picture captured by the second camera in real time. 4. The method according to claim 1, wherein the position of the specified pixel area in the first preview image comprises: The upper left corner, upper right corner, lower left corner or lower right corner of the first preview image. 5. The method according to any one of claims 1-4, wherein the method further comprises: Detecting a drag operation on the second preview image on a display screen of the terminal; Obtain the drag track and end position of the drag operation; The second preview image is moved along the dragging track, and finally covered on the pixel area where the ending position is located. 6. A display device for a camera preview image, characterized in that it comprises: The first display unit is configured to transmit the picture taken by the first camera of the terminal to the display screen of the terminal in real time as the first preview picture; The first detection unit is configured to detect the focus object in the preview image when the focus instruction is issued; A generating unit, configured to zoom the second camera of the terminal to the focused object area to zoom in and image the focused object, and generate a second preview image according to the real-time images captured by the second camera; The second display unit is configured to synthesize the second preview image into the specified pixel area of the first preview image, and simultaneously display it on the display screen of the terminal. 7. The device according to claim 6, wherein the second display unit comprises: a first acquiring subunit, configured to acquire the image resolution of the specified pixel area; The overlay subunit is configured to overlay the second preview picture on the designated pixel area after compressing the second preview image to the image resolution. 8. The device according to claim 6, wherein the generating unit comprises: a second acquiring subunit, configured to acquire the image resolution of the specified pixel area; an adjustment subunit, configured to adjust the imaging resolution of the second camera to the size of the image resolution; The shooting subunit is configured to make the second camera zoom to the focus object, and generate the second preview picture with the image resolution size according to the picture captured by the second camera in real time. 9. The device according to claim 6, wherein the position of the specified pixel area in the first preview image comprises: The upper left corner, upper right corner, lower left corner or lower right corner of the first preview image. 10. The device according to any one of claims 6-9, characterized in that the device further comprises: A second detection unit, configured to detect a drag operation on the second preview image on a display screen of the terminal; an acquiring unit, configured to acquire the dragging track and the termination position of the dragging operation; The third display unit is configured to move the second preview image along the dragging track, and finally cover the pixel area where the ending position is located. 11. A terminal, characterized in that the terminal comprises a display device for a camera preview screen according to any one of claims 6-10. 12. The terminal according to claim 11, wherein the terminal comprises a smart phone or a tablet.