KR20120060677A - Method for capturing image in a portable terminal - Google Patents

Abstract

PURPOSE: An image photographing method of a portable terminal is provided to photograph an image while specifically confirming the movement of a subject. CONSTITUTION: A controller displays an image in an interest region if a specific region of a preview screen is set as the interest region(S203). The controller photographs an image through a camera module(S207). The controller displays the photographed image. The controller stores the image according to a storage request.

Description

How to take a picture of your mobile device {METHOD FOR CAPTURING IMAGE IN A PORTABLE TERMINAL}

The present invention relates to a portable terminal, and more particularly, to an image capturing method of a portable terminal.

In general, a mobile terminal means an electronic device that provides functions such as making a call and exchanging data while moving. As the mobile communication environment is diversified and developed, the use area of the mobile terminal, which has stayed only in a voice call, The trend is to diversify. Use Audio On Demand (AOD) and Video On Demand (VOD) services, make video calls in real time using a camera equipped with a mobile terminal, download and play game applications, or digital multimedia broadcasting (DMB) receivers An example of watching a digital multimedia broadcasting using the above is an example.

In particular, in recent years, the mounting of a camera module in a mobile terminal has become common, and through this, a function of capturing an image (still picture image or moving picture image) using a mobile terminal is widely used.

As described above, various techniques for assisting a user in capturing an image are provided according to a trend in which image capturing in a portable terminal has become common. A representative example of this is a live view capturing method.

Conventional shooting methods using a preview screen such as Live View shooting, while taking a picture while viewing the preview screen displayed on the display device to conveniently capture the subject to shoot, and at various angles, such as high angle and low angle Provides the ability to shoot.

Meanwhile, the conventional shooting method using live view provides only a function of capturing an image while checking a subject after displaying a preview screen. The conventional shooting method captures an image by checking the fine movement of various subjects to be photographed. It does not provide a way to do it.

For example, an image may be photographed in a situation in which a particular subject turns his head to look at a place other than the front, and thus, the photographer may be inconvenient to retake the image.

Accordingly, there is a need to propose an invention capable of capturing an image while checking the movement of the subject in detail by supplementing the method of simply photographing the subject by displaying the subject on a preview screen.

Accordingly, the present invention proposes a photographing method capable of preventing re-shooting of an image by capturing the image while checking the motion of the subject in detail when capturing the image in the mobile terminal.

According to an embodiment of the present invention, a method of capturing an image in a mobile terminal may include displaying an image input through a camera module as a preview screen, and when a predetermined region of the preview screen is set as a region of interest, an image corresponding to the region of interest. And displaying a magnified image at a predetermined ratio and capturing an image being input through a camera module when an image corresponding to the enlarged and displayed region of interest is changed by a predetermined value or more based on the enlarged displayed view point.

In addition, the present invention provides a method for capturing an image in a mobile terminal, the process of displaying the image input through the camera module to the preview screen, and if a predetermined region of the preview screen is set as the region of interest corresponding to the region of interest And zooming in and displaying an image at a predetermined ratio, and capturing an image being input through a camera module when the photographing key is input while the ROI is displayed at a predetermined ratio.

The present invention has the effect of preventing the re-shooting of the image by taking an image while checking in detail the movement of the subject.

1 is a block diagram of a mobile terminal according to an embodiment of the present invention.
2 is a flowchart illustrating a method of capturing an image according to an exemplary embodiment of the present invention.
3 is a first exemplary view of a method of photographing an image according to an exemplary embodiment of the present invention.
4 is a second exemplary view of a method of photographing an image according to an exemplary embodiment of the present invention.
5 is a third exemplary view of a method of photographing an image according to an exemplary embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a mobile terminal according to an embodiment of the present invention.

A mobile terminal according to an embodiment of the present invention is a mobile electronic device, which is a video telephone, a mobile phone, a smart phone, an International Mobile Telecommunication 2000 (IMT-2000) terminal, a WCDMA terminal, and a Universal Mobile Telecommunication Service (UMTS) terminal. , Personal Digital Assistant (PDA), Portable Multimedia Player (PMP), Digital Multimedia Broadcasting (DMB), Personal Computer, Desktop Computer, Notebook, or Digital Camera. Can be.

The block diagram of FIG. 1 includes devices that may be included in a mobile terminal, such as a GPS (Global Positioning System) module, a camera module, a Bluetooth module, a WiFi module, an acceleration sensor, a proximity sensor, a geomagnetic field sensor, and a digital multimedia broadcasting (DMB) receiver. Although not shown, it will be apparent to those skilled in the art that these non-illustrated devices may be included in the portable terminal according to an embodiment of the present invention to provide a corresponding function.

For example, an acceleration sensor may measure dynamic force such as acceleration, vibration, shock, and the like to detect a movement state of the mobile terminal, and thus may be used to detect a display direction of the display unit of the mobile terminal. In addition, the proximity sensor detects the proximity of a part of the user's body to the portable terminal, and may be used for preventing a malfunction of the portable terminal providing a touch screen function. In addition, the gyroscope observes the dynamic movement of the rotating mobile terminal. The gyroscope works in conjunction with the acceleration sensor to detect the rotational motion of the six axes of the mobile terminal, ie, up, down, left, right, front, x, y, and z axes. It can be used to detect.

The wireless transceiver 23 includes an RF unit and a modem. The RF unit includes an RF transmitter for upconverting and amplifying a frequency of a transmitted signal, and an RF receiver for low noise amplifying and downconverting a received signal. The modem MODEM includes a transmitter for encoding and modulating a signal to be transmitted, a receiver for demodulating and decoding a signal received at an RF unit, and the like.

The audio processor 25 may configure a codec, and the codec includes a data codec and an audio codec. The data codec processes packet data and the like, and the audio codec processes audio signals such as voice and multimedia files. The audio processor 25 converts and plays an analog audio signal received from a modem through the audio codec, or converts an analog audio signal generated from a microphone into a digital audio signal through the audio codec and transmits the digital audio signal to a modem. Perform the function. The codec may be provided separately or included in the controller 10.

The key input unit 27 may include keys required for input of numeric and character information, function keys necessary for setting various functions, a touch pad, and the like. When the display unit 50 according to an exemplary embodiment of the present invention is implemented by a touch screen method, the key input unit 27 according to the exemplary embodiment of the present invention excludes the configuration of the key input unit 27 from the configuration of the mobile terminal or is preset. Only the minimum key may be included, and thus, the display unit 50 may partially replace the key input function of the key input unit 27.

The memory 30 may be composed of a program memory and a data memory. The program memory stores a program for controlling a general operation of the portable terminal. Memory 30 according to an embodiment of the present invention is a Compact Flash (CF), Secure Digital (SD), Micro Secure Digital (Micro-SD), Mini Secure Digital (Mini-SD), Extreme Digital (xD) and Memory Stick It may also include an external memory such as.

The memory 30 according to an embodiment of the present invention may temporarily store an image displayed on the preview screen, or store a photographed image when a photographing request for the image displayed on the preview screen is requested.

The display unit 50 may be formed of a liquid crystal display (LCD) or an organic light emitting diode (OLED), such as PMOLED or AMOLED, and outputs various types of display information generated by a mobile terminal. The display unit 50 according to an exemplary embodiment of the present invention may include a touch screen and operate as an input unit for controlling the portable terminal together with the key input unit 27.

The display unit 50 according to an embodiment of the present invention displays a preview screen for identifying the subjects to be photographed when the image is captured. The user selects a subject to focus on while viewing the preview screen through the display unit 50 (for example, touch inputs a subject to focus on), and photographs that may be provided through the key input unit 27 or the display unit 50. You can take a picture with the key.

The camera module 60 converts an optical signal input (or photographed) through the lens into an electrical image signal and outputs the electrical signal, so that the user can capture an image (movie or still image) through the lens. The camera module 60 includes a lens (not shown) that collects light and transmits the light to a camera sensor, a camera sensor (not shown) that converts an optical signal photographed when the image is captured, into an electrical image signal, and temporarily photographs the image. Camera memory (not shown) that can be stored, a flash (not shown) that provides an appropriate amount of light according to the surrounding conditions at the time of shooting, and an analog video signal that is controlled by the camera sensor while controlling the overall operation of the camera module 60. It includes a camera control unit 61 for converting the digital data.

The lens may be composed of one or more lenses, the camera sensor may be a CCD sensor or a CMOS sensor, and the camera controller 61 may be implemented as an image signal processor (ISP) or a digital signal processor (DSP). At this time, the camera sensor and the camera control unit 61 may be integrally implemented or separated from each other.

Flash is a camera accessory that uses the instantaneous discharge light generated by high-pressure direct current through a xenon discharge tube as a light source for photographing. It is usually called a strobe, but it is also a brand name, and is also called an electronic flash and a speed flash. As a power source, a stacked battery is used to boost the required high voltage. The types include clip on types of guide numbers GN 14 to 30 and clip types of GN 30 to 50. The emission time is very short, such as 1 / 1,000 seconds, and is very bright as white light (natural light), and thus serves as a main light source of artificial light.

The camera controller 61 controls the camera module 60 to output an image photographed (or input) through a lens, a camera sensor, or the like to the controller 10 as a photographing image. That is, the camera control unit 61 captures an image according to a setting (for example, a shooting resolution, etc.) and a still image such as a JPEG (joint photographic coding experts group) format suitable for processing by the control unit 10 of the portable terminal. And a codec capable of compressing the video into a video format such as a Moving Picture Experts Group (MPEG) format, and the camera controller 61 stores an image compressed in the JPEG or MPEG format through the aforementioned codec of the mobile terminal. It can be controlled to output to the control unit 10. Therefore, in the embodiment of the present invention, the photographing image is an image photographed according to a setting selected by a user by inputting a photographing key (for example, a setting related to photographing such as a resolution, an aperture value, and an exposure value), such as a lens and a camera sensor. The image captured through the image is compressed (or converted) into a format that can be processed by the controller 10, such as a format such as JPEG or MPEG.

On the other hand, the camera control unit 61 according to an embodiment of the present invention to output the image (or input) taken through the lens and the camera sensor to the control unit 10 as a preview screen (or image) to the camera module 60 To control. For example, the camera controller 61 converts an image signal photographed through a camera sensor into digital data, converts the converted digital data into a YUV format suitable for display of a preview screen, and outputs it to the controller 10. The control unit 10 receives the control and outputs the same through the display unit 50.

Here, YUV is a method of expressing pixels by configuring the Y component of luminance and U (Cb) and V (Cr) components of chrominance. It is suitable for displaying images for preview screens, such as preview screens.

The controller 10 controls the overall operation of the mobile terminal according to an embodiment of the present invention, and can switch and control the operation of the mobile terminal according to a user input input through the key input unit 27 or the display unit 50. have. According to an embodiment of the present disclosure, the controller 10 displays an image input through the camera module as a preview screen, and when a predetermined region of the preview screen is set as the ROI, the image corresponding to the ROI is enlarged and displayed at a predetermined ratio. If the image corresponding to the enlarged and displayed region of interest is changed by a predetermined value or more based on the enlarged and displayed time point, or if an image is input, the camera module controls to capture the image being input through the camera module.

2 is a flowchart illustrating a method of capturing an image according to an embodiment of the present invention, FIG. 3 is a first exemplary view of a method of capturing an image according to an embodiment of the present invention, and FIG. 4 is an embodiment of the present invention. A second exemplary view of a method of capturing an image according to an example, and FIG. 5 is a third exemplary view of a method of capturing an image according to an exemplary embodiment of the present invention. Looking at the embodiment of the present invention with reference to Figures 1 to 5 as follows.

In steps S201-S202, the controller 10 controls to display a preview screen when it is confirmed that the camera photographing mode is executed.

When the user enters the camera shooting mode according to the request of the user, the controller 10 controls the camera module 60 to be driven through the control of the camera controller 61. Thereafter, the controller 10 receives an image input from the camera module 60 through a lens, a camera sensor, or the like, and then controls the display image to be displayed on the pre-pu screen through the display unit 50.

Referring to FIG. 3, for example, the controller 10 controls to display the image received from the camera module 60 on the display unit 50 as a preview screen, such as 310, through which the user views an angle of view for camera shooting. The subject may be selected and shooting settings (eg, setting of an aperture value and a shutter speed) may be performed.

In steps S203-S204, the controller 10 determines whether the predetermined region of the displayed preview screen is set as the ROI, and controls to enlarge and display an image corresponding to the set ROI at a predetermined ratio.

The user may set a subject, which is a subject of photographing, to a region of interest when capturing an image, or may set a subject having a high probability of causing a photographing failure as a region of interest.

For example, through FIG. 3, the user may set the ROI as 320 through a key input or a touch screen input (for example, inputting a drag touch input having a rectangular shape). The region of interest of 320 of FIG. 3 illustrates an example in which the region of interest is set for a subject having a high probability of photographing failure due to the continuous movement of the subject located in the region of interest.

When the ROI is set as shown in FIG. 3, the controller 10 enlarges the image corresponding to the ROI (ie, located inside the ROI) at a predetermined ratio as shown in 330 of FIG. 3. To display. In this way, the user may easily identify an image (eg, an image of a baby's face) corresponding to the ROI.

In this case, an image corresponding to the ROI that is enlarged and displayed may be displayed in a full screen and the preview screen may not be displayed. For example, 330, which is an image corresponding to the ROI enlarged and displayed in FIG. 3, may be displayed as the entire screen of the display unit 50 instead of the preview screen of 310. That is, only the screen 330 of FIG. 3 may be displayed on the display unit 50.

Unlike the above description, the image corresponding to the ROI to be enlarged and displayed is displayed together with the preview screen, and then only the image corresponding to the ROI to be enlarged according to a predetermined condition may be displayed on the display unit 50. This is explained.

5 illustrates a case in which the ROI is described with respect to a dog's subject.

When the region of interest is set for the dog's subject while the preview screen is displayed, the controller 10 reduces the preview screen as shown in 500b and enlarges and displays the image 500a corresponding to the region of interest, but 500a and 500b. Is controlled to be displayed on one display screen 500. In this way, the user may check the movement of the subject to be photographed and at the same time check the composition and angle of view related to the image capture.

Thereafter, when a condition for displaying only an image corresponding to the ROI is satisfied, the controller 10 may display only the image 500a corresponding to the ROI as shown on the display screen of 510. Control to display on Here, the conditions for displaying only the image corresponding to the ROI may be a time condition and an input condition. The reduced preview image 500b and the image 500a corresponding to the ROI are displayed on one display. For example, a predetermined time (for example, 1 second) elapses after being displayed on the screen 500, and a user inputs (for example, taps) a touch input for either 500a or 500b.

On the other hand, in the enlarged display of the image corresponding to the region of interest at a predetermined ratio, the ratio of the enlarged display may be set to a ratio that is easy to identify the subject, it is possible to change the setting for the enlarged display ratio later. On the other hand, while the previous technique has been described to enlarge the image corresponding to the region of interest to display in full screen, it may not be necessarily displayed in full screen, it may be displayed with various menus, which is a variation of the embodiment It is possible to change the design accordingly.

In steps S205-S207, the controller 10 controls to capture the image being input through the camera module 60 when the enlarged displayed image is changed by more than a predetermined value or a shooting key is input.

When the image corresponding to the ROI is enlarged and displayed as shown in 330 of FIG. 3, the user may request an image capturing while checking the image (for example, the baby's face), which is automatically or manually performed. Can be.

For example, if the subject (eg, the baby's face as the image corresponding to the ROI) moves, the pixel data of the image corresponding to the ROI is changed. Accordingly, the controller 10 confirms that the image data corresponding to the ROI is enlarged and the pixel data of the image corresponding to the ROI is changed and the pixel data of the image corresponding to the ROI changes more than a predetermined value. If a difference occurs by more than a percent), it is possible to control to automatically capture the image.

For example, when it is detected that the pixel data fluctuates by a predetermined value or more, the controller 10 may control to continuously photograph an image being input through the camera module 60 a predetermined number of times (for example, two times). Can be.

For example, through FIG. 4, 410 illustrated in FIG. 4 is an image displayed at 310 of FIG. 3 and is a preview screen of a time point at which an image set as an ROI is enlarged and displayed. Referring to FIG. 4, FIG. 4 may be understood to illustrate an embodiment in which images of 420 and 430 are automatically photographed continuously based on the preview screen of 410 according to the above-described automatic photographing embodiment of the present invention. .

Manual shooting of an image is performed by a user directly inputting a shooting key (via a key input unit or a touch screen), when the user inputs a shooting key while checking an image corresponding to the enlarged and displayed region of interest of 330 shown in FIG. 3. For example. For example, the photographed images of 420 and 430 illustrated in FIG. 4 are obtained by checking a face (eg, an image corresponding to the ROI) in an enlarged state as shown in 330 illustrated in FIG. 3. If the face moves, it can be understood that the image was captured by inputting a shooting key at that time.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of example, It is to be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically described herein.

Claims (13)

In the method of photographing the image in the mobile terminal,
Displaying the image input through the camera module on a preview screen;
If the predetermined region of the preview screen is set as the region of interest, displaying an image corresponding to the region of interest at a predetermined ratio;
Photographing an image being input through a camera module when the image corresponding to the enlarged and displayed region of interest is changed by a predetermined value or more based on the enlarged and displayed time point;
And displaying the captured image and storing the image according to a storage request.
The method of claim 1, wherein the photographing process comprises:
When the image corresponding to the enlarged displayed ROI is changed by a predetermined value or more based on the enlarged displayed time point,
And sequentially photographing an image being input through the camera module at a predetermined time interval a predetermined number of times.
The method of claim 1,
The region of interest is set by at least one of a user's key input and a touch input.
The method of claim 1, wherein the enlarged display process is performed.
And when the predetermined area of the preview screen is set as the ROI, displaying the preview screen and the image corresponding to the enlarged and displayed ROI on one display screen.
The method of claim 4, wherein
And displaying only the preview screen after a predetermined time elapses after displaying the preview screen and the image corresponding to the enlarged-displayed ROI on one display screen.
The method of claim 4, wherein
And displaying only the selected preview screen when the preview screen is selected after displaying the preview screen and the image corresponding to the enlarged-displayed ROI on one display screen.
In the method of photographing the image in the mobile terminal,
Displaying the image input through the camera module on a preview screen;
If the predetermined region of the preview screen is set as the region of interest, displaying an image corresponding to the region of interest at a predetermined ratio;
And photographing an input image through the camera module when the photographing key is input while the ROI is displayed at a predetermined ratio.
The method of claim 7, wherein
And displaying the captured image and storing the image according to a storage request.
The method of claim 7, wherein the photographing process,
And photographing an image being input through the camera module at predetermined time intervals for a predetermined number of times, when the photographing key is input while the ROI is enlarged and displayed at a predetermined ratio.
The method of claim 7, wherein
The region of interest is set by at least one of a user's key input and a touch input.
The method of claim 7, wherein the display process,
And when the predetermined area of the preview screen is set as the ROI, displaying the preview screen and the image corresponding to the enlarged and displayed ROI on one display screen.
The method of claim 11,
And displaying only the preview screen after a predetermined time elapses after displaying the preview screen and the image corresponding to the enlarged-displayed ROI on one display screen.
The method of claim 11,
And displaying only the selected preview screen when the preview screen is selected after displaying the preview screen and the image corresponding to the enlarged-displayed ROI on one display screen.

Images