KR101578437B1 - Mobile terminal and control method for the mobile terminal - Google Patents

Abstract

The present invention relates to a mobile terminal having a photographing function and a control method thereof. The mobile terminal according to an embodiment of the present invention comprises: a camera; a display unit for outputting a preview image received through the camera; and a control unit for controlling a size of a focal region in an image corresponding to the focal region having a predetermined size among the preview images, based on whether a boundary area divided on the basis of colors included in the image belongs to the focal region. The control unit keeps the focal region at the predetermined size when the boundary area belongs to the focal region, or magnifies the focal region having the predetermined size when the boundary area does not belong to the focal region.

Description

[0001] MOBILE TERMINAL AND CONTROL METHOD FOR THE MOBILE TERMINAL [0002]

The present invention relates to a mobile terminal having a video image taking function and a control method thereof.

The terminal can move And can be divided into a mobile / portable terminal and a stationary terminal depending on whether the mobile terminal is a mobile terminal or a mobile terminal. The mobile terminal can be divided into a handheld terminal and a vehicle mount terminal according to whether the user can directly carry the mobile terminal.

Such a terminal has various functions, for example, in the form of a multimedia device having multiple functions such as photographing and photographing of a moving picture, reproduction of a music or video file, reception of a game and broadcasting, etc. .

Various new attempts have been made in terms of hardware or software to implement the complex functions of such multimedia devices. For example, a user interface environment is provided for a user to easily and conveniently search for or select a function.

In recent years, as the resolution and the function of the camera provided in the mobile terminal have improved, the utilization of the camera provided in the mobile terminal has been increased.

It is an object of the present invention to provide a mobile terminal capable of providing an optimal image capturing function and a control method thereof.

It is another object of the present invention to provide a mobile terminal capable of performing autofocus optimized in a video image taking function and a control method thereof.

A mobile terminal according to an exemplary embodiment of the present invention includes a camera, a display unit for outputting a preview image received through the camera, and a display unit for displaying, in an image corresponding to a focus area having a predetermined size, And a control unit for controlling a size of the focus area based on whether a boundary part based on a color is included in the focus area, wherein when the boundary part is included in the focus area, The size of the region is maintained at the predetermined size, and when the boundary portion is not included in the focus region, the size of the focus region having the predetermined size is enlarged.

In an exemplary embodiment, the controller may enlarge the size of the focus area until a boundary portion is included in the focus area based on colors included in the preview image.

In an exemplary embodiment, the focus area may be changed based on a touch applied to an area where the preview image is output.

In an exemplary embodiment, an indicator for guiding the focus area is displayed on the display unit.

In one embodiment, the indicator is displayed to correspond to a focus area having the changed size when the size of the focus area is changed.

In one embodiment of the present invention, the control unit moves at least two preview images having different focal distances by moving a lens provided in the camera, and acquires at least two preview images using the obtained at least two preview images, And determining whether or not the part is included.

In one embodiment, the obtained at least two preview images are formed in different colors with different focal lengths.

In one embodiment of the present invention, the controller extracts a focus value for an image corresponding to the focus area on the obtained at least two preview images, and when the focus value of the acquired at least two preview images exceeds a threshold value When the preview image exists, it is determined that the boundary portion is included in the focus area.

In an embodiment, the lens is movable within a movable range, and the control unit moves the lens with respect to all of the movable range, and then determines whether or not the boundary portion is included in the focus area, And varying the size of the focus area based on the determination result.

In the embodiment, the controller may determine whether the boundary portion is included in the focus area after moving the lens only a part of the movable range of the lens.

In an embodiment, the determination is made based on a change amount of an image focus value corresponding to the extracted focus region while the lens is moved by the portion.

In an embodiment, the control unit determines that the boundary portion is not included in the focus region when the variation amount of the focus value is smaller than the reference variation amount.

In one embodiment of the present invention, when it is determined that the boundary portion is not included in the focus region, the controller enlarges the size of the focus region in a state in which the lens is moved by the portion, And determines whether the boundary portion is included in the enlarged focus region.

In an embodiment, the focus area is at least one, and the control unit is configured to, when an image corresponding to the at least one focus area of the preview image is not included in the at least one focus area, And a focus area is additionally set.

In an embodiment, the new focus area is set around the at least one focus area.

In an embodiment, the controller may further set the new focus area until the new focus area includes a boundary portion based on hues.

In an exemplary embodiment, the new focus area is set at a position corresponding to at least a part of a boundary part based on a hue included in the preview image.

According to another aspect of the present invention, there is provided a method for controlling a mobile terminal, the method comprising: outputting a preview image received through a camera; and outputting, in a preview image corresponding to a focus region having a predetermined size, And controlling the magnitude of the focus area based on whether or not a boundary part is included in the focus area, wherein, when the boundary part is included in the focus area, The size of the focus area is maintained at the predetermined size, and when the boundary part is not included in the focus area, the size of the focus area having the predetermined size is enlarged.

In one embodiment of the present invention, the controlling step enlarges the size of the focus area until a boundary part is included in the focus area based on hues included in the preview image.

The present invention can perform autofocus by varying the size and the number of the focus area when there is no boundary part that is divided on the basis of color in the focus area. Therefore, the present invention can provide an autofocus function optimized for using a video image shooting function.

1A is a block diagram illustrating a mobile terminal according to the present invention.
1B and 1C are conceptual diagrams illustrating an example of a mobile terminal according to the present invention in different directions.
2 is a flowchart typically showing a control method of the present invention.
3 is a conceptual diagram for explaining the control method shown in FIG.
FIGS. 4A, 4B, 4C, and 4D are conceptual diagrams for explaining a method for determining whether or not a boundary portion, which is distinguished based on hues, is included in a focus region.
FIGS. 5A and 5B are conceptual diagrams for explaining a method for controlling the timing of changing the size of the focus region differently when the boundary portion is not included in the focus region.
6 is a conceptual diagram for explaining a method of setting a focus area according to an embodiment of the present invention.
FIG. 7 is a conceptual diagram illustrating a method of displaying an indicator when a boundary portion that is divided based on hues is included in a focus region according to an exemplary embodiment of the present invention.
FIGS. 8A, 8B, 8C, and 8D are diagrams for explaining a method for additionally setting a new focus area in a case where a boundary part based on hue is not included in the focus area according to an embodiment of the present invention It is a conceptual diagram.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

The mobile terminal described in this specification includes a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation device, a slate PC A tablet PC, an ultrabook, a wearable device such as a smartwatch, a smart glass, and a head mounted display (HMD). have.

However, it will be appreciated by those skilled in the art that the configuration according to the embodiments described herein may be applied to fixed terminals such as a digital TV, a desktop computer, a digital signage, and the like, will be.

1A to 1C are block diagrams for explaining a mobile terminal according to the present invention, and FIGS. 1B and 1C are conceptual diagrams showing an example of a mobile terminal according to the present invention in different directions.

The mobile terminal 100 includes a wireless communication unit 110, an input unit 120, a sensing unit 140, an output unit 150, an interface unit 160, a memory 170, a control unit 180, and a power supply unit 190 ), And the like. The components shown in FIG. 1A are not essential for implementing a mobile terminal, so that the mobile terminal described herein may have more or fewer components than the components listed above.

The wireless communication unit 110 may be connected between the mobile terminal 100 and the wireless communication system or between the mobile terminal 100 and another mobile terminal 100 or between the mobile terminal 100 and the external server 100. [ Lt; RTI ID = 0.0 > wireless < / RTI > In addition, the wireless communication unit 110 may include one or more modules for connecting the mobile terminal 100 to one or more networks.

The wireless communication unit 110 may include at least one of a broadcast receiving module 111, a mobile communication module 112, a wireless Internet module 113, a short distance communication module 114, and a location information module 115 .

The input unit 120 includes a camera 121 or an image input unit for inputting a video signal, a microphone 122 for inputting an audio signal, an audio input unit, a user input unit 123 for receiving information from a user A touch key, a mechanical key, and the like). The voice data or image data collected by the input unit 120 may be analyzed and processed by a user's control command.

The sensing unit 140 may include at least one sensor for sensing at least one of information in the mobile terminal, surrounding environment information surrounding the mobile terminal, and user information. For example, the sensing unit 140 may include a proximity sensor 141, an illumination sensor 142, a touch sensor, an acceleration sensor, a magnetic sensor, A G-sensor, a gyroscope sensor, a motion sensor, an RGB sensor, an infrared sensor, a finger scan sensor, an ultrasonic sensor, A microphone 226, a battery gauge, an environmental sensor (for example, a barometer, a hygrometer, a thermometer, a radiation detection sensor, A thermal sensor, a gas sensor, etc.), a chemical sensor (e.g., an electronic nose, a healthcare sensor, a biometric sensor, etc.). Meanwhile, the mobile terminal disclosed in the present specification can combine and utilize information sensed by at least two of the sensors.

The output unit 150 includes at least one of a display unit 151, an acoustic output unit 152, a haptic tip module 153, and a light output unit 154 to generate an output related to visual, auditory, can do. The display unit 151 may have a mutual layer structure with the touch sensor or may be integrally formed to realize a touch screen. The touch screen may function as a user input unit 123 that provides an input interface between the mobile terminal 100 and a user and may provide an output interface between the mobile terminal 100 and a user.

The interface unit 160 serves as a path to various types of external devices connected to the mobile terminal 100. The interface unit 160 is connected to a device having a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, And may include at least one of a port, an audio I / O port, a video I / O port, and an earphone port. In the mobile terminal 100, corresponding to the connection of the external device to the interface unit 160, it is possible to perform appropriate control related to the connected external device.

In addition, the memory 170 stores data supporting various functions of the mobile terminal 100. The memory 170 may store a plurality of application programs or applications running on the mobile terminal 100, data for operation of the mobile terminal 100, and commands. At least some of these applications may be downloaded from an external server via wireless communication. Also, at least a part of these application programs may exist on the mobile terminal 100 from the time of shipment for the basic functions (e.g., telephone call receiving function, message receiving function, and calling function) of the mobile terminal 100. Meanwhile, the application program may be stored in the memory 170, installed on the mobile terminal 100, and may be operated by the control unit 180 to perform the operation (or function) of the mobile terminal.

In addition to the operations related to the application program, the control unit 180 typically controls the overall operation of the mobile terminal 100. The control unit 180 may process or process signals, data, information, and the like input or output through the above-mentioned components, or may drive an application program stored in the memory 170 to provide or process appropriate information or functions to the user.

In addition, the controller 180 may control at least some of the components illustrated in FIG. 1A in order to drive an application program stored in the memory 170. FIG. In addition, the controller 180 may operate at least two of the components included in the mobile terminal 100 in combination with each other for driving the application program.

The power supply unit 190 receives external power and internal power under the control of the controller 180 and supplies power to the components included in the mobile terminal 100. The power supply unit 190 includes a battery, which may be an internal battery or a replaceable battery.

At least some of the components may operate in cooperation with one another to implement a method of operation, control, or control of a mobile terminal according to various embodiments described below. In addition, the operation, control, or control method of the mobile terminal may be implemented on the mobile terminal by driving at least one application program stored in the memory 170. [

Hereinafter, the various components of the mobile terminal 100 will be described in detail with reference to FIG. 1A.

First, referring to the wireless communication unit 110, the broadcast receiving module 111 of the wireless communication unit 110 receives broadcast signals and / or broadcast-related information from an external broadcast management server through a broadcast channel. The broadcast channel may include a satellite channel and a terrestrial channel. Two or more broadcast receiving modules may be provided to the mobile terminal 100 for simultaneous broadcast reception or broadcast channel switching for at least two broadcast channels.

The mobile communication module 112 may be a mobile communication module or a mobile communication module such as a mobile communication module or a mobile communication module that uses technology standards or a communication method (e.g., Global System for Mobile communication (GSM), Code Division Multi Access (CDMA), Code Division Multi Access 2000 (Enhanced Voice-Data Optimized or Enhanced Voice-Data Only), Wideband CDMA (WCDMA), High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA), Long Term Evolution And an external terminal, or a server on a mobile communication network established according to a long term evolution (AR), a long term evolution (AR), or the like.

The wireless signal may include various types of data depending on a voice call signal, a video call signal or a text / multimedia message transmission / reception.

The wireless Internet module 113 is a module for wireless Internet access, and may be built in or externally attached to the mobile terminal 100. The wireless Internet module 113 is configured to transmit and receive a wireless signal in a communication network according to wireless Internet technologies.

Wireless Internet technologies include, for example, wireless LAN (WLAN), wireless fidelity (Wi-Fi), wireless fidelity (Wi-Fi) Direct, DLNA (Digital Living Network Alliance), WiBro Interoperability for Microwave Access, High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA), Long Term Evolution (LTE) and Long Term Evolution-Advanced (LTE-A) 113 transmit and receive data according to at least one wireless Internet technology, including Internet technologies not listed above.

The wireless Internet module 113 for performing a wireless Internet connection through the mobile communication network can be used for wireless Internet access by WiBro, HSDPA, HSUPA, GSM, CDMA, WCDMA, LTE or LTE- May be understood as a kind of the mobile communication module 112.

The short-range communication module 114 is for short-range communication, and includes Bluetooth ™, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB) (Near Field Communication), Wi-Fi (Wireless-Fidelity), Wi-Fi Direct, and Wireless USB (Wireless Universal Serial Bus) technology. The short-range communication module 114 is connected to the mobile terminal 100 and the wireless communication system through the wireless area networks, between the mobile terminal 100 and another mobile terminal 100, or between the mobile terminal 100 ) And the other mobile terminal 100 (or the external server). The short-range wireless communication network may be a short-range wireless personal area network.

Here, the other mobile terminal 100 may be a wearable device (e.g., a smartwatch, a smart glass, etc.) capable of interchanging data with the mobile terminal 100 according to the present invention (smart glass), HMD (head mounted display)). The short range communication module 114 may detect (or recognize) a wearable device capable of communicating with the mobile terminal 100 around the mobile terminal 100. [ If the detected wearable device is a device authenticated to communicate with the mobile terminal 100 according to the present invention, the control unit 180 may transmit at least a part of the data processed by the mobile terminal 100 to the short- 114 to the wearable device. Therefore, the user of the wearable device can use the data processed by the mobile terminal 100 through the wearable device. For example, according to this, when a telephone is received in the mobile terminal 100, the user performs a telephone conversation via the wearable device, or when a message is received in the mobile terminal 100, It is possible to check the message.

The position information module 115 is a module for obtaining the position (or current position) of the mobile terminal, and a representative example thereof is a Global Positioning System (GPS) module or a Wireless Fidelity (WiFi) module. For example, when the mobile terminal utilizes the GPS module, it can acquire the position of the mobile terminal by using a signal transmitted from the GPS satellite. As another example, when the mobile terminal utilizes the Wi-Fi module, it can acquire the position of the mobile terminal based on information of a wireless access point (AP) that transmits or receives the wireless signal with the Wi-Fi module. Optionally, the location information module 115 may perform any of the other functions of the wireless communication unit 110 to obtain data relating to the location of the mobile terminal, in addition or alternatively. The location information module 115 is a module used to obtain the location (or current location) of the mobile terminal, and is not limited to a module that directly calculates or obtains the location of the mobile terminal.

Next, the input unit 120 is for inputting image information (or signal), audio information (or signal), data, or information input from a user. For inputting image information, Or a plurality of cameras 121 may be provided. The camera 121 processes image frames such as still images or moving images obtained by the image sensor in the video communication mode or the photographing mode. The processed image frame may be displayed on the display unit 151 or stored in the memory 170. [ A plurality of cameras 121 provided in the mobile terminal 100 may be arranged to have a matrix structure and various angles or foci may be provided to the mobile terminal 100 through the camera 121 having the matrix structure A plurality of pieces of image information can be input. In addition, the plurality of cameras 121 may be arranged in a stereo structure to acquire a left image and a right image for realizing a stereoscopic image.

The microphone 122 processes the external acoustic signal into electrical voice data. The processed voice data can be utilized variously according to a function (or a running application program) being executed in the mobile terminal 100. Meanwhile, the microphone 122 may be implemented with various noise reduction algorithms for eliminating noise generated in receiving an external sound signal.

The user input unit 123 is for receiving information from a user and when the information is inputted through the user input unit 123, the control unit 180 can control the operation of the mobile terminal 100 to correspond to the input information . The user input unit 123 may include a mechanical input means (or a mechanical key such as a button located on the front, rear or side of the mobile terminal 100, a dome switch, a jog wheel, Jog switches, etc.) and touch-type input means. For example, the touch-type input means may comprise a virtual key, a soft key or a visual key displayed on the touch screen through software processing, And a touch key disposed on the touch panel. Meanwhile, the virtual key or the visual key can be displayed on a touch screen having various forms, for example, a graphic, a text, an icon, a video, As shown in FIG.

Meanwhile, the sensing unit 140 senses at least one of information in the mobile terminal, surrounding environment information surrounding the mobile terminal, and user information, and generates a corresponding sensing signal. The control unit 180 may control the driving or operation of the mobile terminal 100 or may perform data processing, function or operation related to the application program installed in the mobile terminal 100 based on the sensing signal. Representative sensors among various sensors that may be included in the sensing unit 140 will be described in more detail.

First, the proximity sensor 141 refers to a sensor that detects the presence of an object approaching a predetermined detection surface, or the presence of an object in the vicinity of the detection surface, without mechanical contact by using electromagnetic force or infrared rays. The proximity sensor 141 may be disposed in the inner area of the mobile terminal or in proximity to the touch screen, which is covered by the touch screen.

Examples of the proximity sensor 141 include a transmission type photoelectric sensor, a direct reflection type photoelectric sensor, a mirror reflection type photoelectric sensor, a high frequency oscillation type proximity sensor, a capacitive proximity sensor, a magnetic proximity sensor, and an infrared proximity sensor. In the case where the touch screen is electrostatic, the proximity sensor 141 can be configured to detect the proximity of the object with a change of the electric field along the proximity of the object having conductivity. In this case, the touch screen (or touch sensor) itself may be classified as a proximity sensor.

On the other hand, for convenience of explanation, the act of recognizing that the object is located on the touch screen in proximity with no object touching the touch screen is referred to as "proximity touch & The act of actually touching an object on the screen is called a "contact touch. &Quot; The position at which the object is closely touched on the touch screen means a position where the object corresponds to the touch screen vertically when the object is touched. The proximity sensor 141 can detect a proximity touch and a proximity touch pattern (e.g., a proximity touch distance, a proximity touch direction, a proximity touch speed, a proximity touch time, a proximity touch position, have. Meanwhile, the control unit 180 processes data (or information) corresponding to the proximity touch operation and the proximity touch pattern sensed through the proximity sensor 141 as described above, and further provides visual information corresponding to the processed data It can be output on the touch screen. Furthermore, the control unit 180 can control the mobile terminal 100 such that different operations or data (or information) are processed according to whether the touch to the same point on the touch screen is a proximity touch or a touch touch .

The touch sensor uses a touch (or touch input) applied to the touch screen (or the display unit 151) by using at least one of various touch methods such as a resistance film type, a capacitive type, an infrared type, an ultrasonic type, Detection.

For example, the touch sensor may be configured to convert a change in a pressure applied to a specific portion of the touch screen or a capacitance generated in a specific portion to an electrical input signal. The touch sensor may be configured to detect a position, an area, a pressure at the time of touch, a capacitance at the time of touch, and the like where a touch object touching the touch screen is touched on the touch sensor. Here, the touch object may be a finger, a touch pen, a stylus pen, a pointer, or the like as an object to which a touch is applied to the touch sensor.

Thus, when there is a touch input to the touch sensor, the corresponding signal (s) is sent to the touch controller. The touch controller processes the signal (s) and transmits the corresponding data to the controller 180. Thus, the control unit 180 can know which area of the display unit 151 is touched or the like. Here, the touch controller may be a separate component from the control unit 180, and may be the control unit 180 itself.

On the other hand, the control unit 180 may perform different controls or perform the same control according to the type of the touch object touching the touch screen (or a touch key provided on the touch screen). Whether to perform different controls or to perform the same control according to the type of the touch object may be determined according to the current state of the mobile terminal 100 or an application program being executed.

On the other hand, the touch sensors and the proximity sensors discussed above can be used independently or in combination to provide a short touch (touch), a long touch, a multi touch, a drag touch ), Flick touch, pinch-in touch, pinch-out touch, swipe touch, hovering touch, and the like. Touch can be sensed.

The ultrasonic sensor can recognize the position information of the object to be sensed by using ultrasonic waves. Meanwhile, the controller 180 can calculate the position of the wave generating source through the information sensed by the optical sensor and the plurality of ultrasonic sensors. The position of the wave source can be calculated using the fact that the light is much faster than the ultrasonic wave, that is, the time when the light reaches the optical sensor is much faster than the time the ultrasonic wave reaches the ultrasonic sensor. More specifically, the position of the wave generating source can be calculated using the time difference with the time when the ultrasonic wave reaches the reference signal.

The camera 121 includes at least one of a camera sensor (for example, a CCD, a CMOS, etc.), a photo sensor (or an image sensor), and a laser sensor.

The camera 121 and the laser sensor may be combined with each other to sense a touch of the sensing object with respect to the three-dimensional stereoscopic image. The photosensor can be laminated to the display element, which is adapted to scan the movement of the object to be detected proximate to the touch screen. More specifically, the photosensor mounts photo diodes and TRs (Transistors) in a row / column and scans the contents loaded on the photosensor using an electrical signal that varies according to the amount of light applied to the photo diode. That is, the photo sensor performs coordinate calculation of the object to be sensed according to the amount of change of light, and position information of the object to be sensed can be obtained through the calculation.

The display unit 151 displays (outputs) information processed by the mobile terminal 100. For example, the display unit 151 may display execution screen information of an application program driven by the mobile terminal 100 or UI (User Interface) and GUI (Graphic User Interface) information according to the execution screen information .

In addition, the display unit 151 may be configured as a stereoscopic display unit for displaying a stereoscopic image.

In the stereoscopic display unit, a three-dimensional display system such as a stereoscopic system (glasses system), an autostereoscopic system (no-glasses system), and a projection system (holographic system) can be applied.

The sound output unit 152 may output audio data received from the wireless communication unit 110 or stored in the memory 170 in a call signal reception mode, a call mode or a recording mode, a voice recognition mode, a broadcast reception mode, The sound output unit 152 also outputs sound signals related to functions (e.g., call signal reception sound, message reception sound, etc.) performed in the mobile terminal 100. [ The audio output unit 152 may include a receiver, a speaker, a buzzer, and the like.

The haptic module 153 generates various tactile effects that the user can feel. A typical example of the haptic effect generated by the haptic module 153 may be vibration. The intensity and pattern of the vibration generated in the haptic module 153 can be controlled by the user's selection or the setting of the control unit. For example, the haptic module 153 may synthesize and output different vibrations or sequentially output the vibrations.

In addition to vibration, the haptic module 153 may be configured to perform various functions such as a pin arrangement vertically moving with respect to the contact skin surface, a spraying force or suction force of the air through the injection port or the suction port, a touch on the skin surface, And various tactile effects such as an effect of reproducing a cold sensation using an endothermic or exothermic element can be generated.

The haptic module 153 can transmit the tactile effect through the direct contact, and the tactile effect can be felt by the user through the muscles of the finger or arm. The haptic module 153 may include two or more haptic modules 153 according to the configuration of the mobile terminal 100.

The light output unit 154 outputs a signal for notifying the occurrence of an event using the light of the light source of the mobile terminal 100. Examples of events that occur in the mobile terminal 100 may include message reception, call signal reception, missed call, alarm, schedule notification, email reception, information reception through an application, and the like.

The signal output from the light output unit 154 is implemented as the mobile terminal emits light of a single color or a plurality of colors to the front or rear surface. The signal output may be terminated by the mobile terminal detecting the event confirmation of the user.

The interface unit 160 serves as a path for communication with all external devices connected to the mobile terminal 100. The interface unit 160 receives data from an external device or supplies power to each component in the mobile terminal 100 or transmits data in the mobile terminal 100 to an external device. For example, a port for connecting a device equipped with a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, an audio I / O port, a video I / O port, an earphone port, and the like may be included in the interface unit 160.

The identification module is a chip for storing various information for authenticating the use right of the mobile terminal 100 and includes a user identification module (UIM), a subscriber identity module (SIM) A universal subscriber identity module (USIM), and the like. Devices with identification modules (hereinafter referred to as "identification devices") can be manufactured in a smart card format. Accordingly, the identification device can be connected to the terminal 100 through the interface unit 160. [

The interface unit 160 may be a path through which power from the cradle is supplied to the mobile terminal 100 when the mobile terminal 100 is connected to an external cradle, And various command signals may be transmitted to the mobile terminal 100. The various command signals or the power source input from the cradle may be operated as a signal for recognizing that the mobile terminal 100 is correctly mounted on the cradle.

The memory 170 may store a program for the operation of the controller 180 and temporarily store input / output data (e.g., a phone book, a message, a still image, a moving picture, etc.). The memory 170 may store data related to vibration and sound of various patterns outputted when a touch is input on the touch screen.

The memory 170 may be a flash memory type, a hard disk type, a solid state disk type, an SDD type (Silicon Disk Drive type), a multimedia card micro type ), Card type memory (e.g., SD or XD memory), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read memory, a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, and / or an optical disk. The mobile terminal 100 may operate in association with a web storage that performs the storage function of the memory 170 on the Internet.

Meanwhile, as described above, the control unit 180 controls the operations related to the application program and the general operation of the mobile terminal 100. [ For example, when the state of the mobile terminal meets a set condition, the control unit 180 can execute or release a lock state for restricting input of a user's control command to applications.

In addition, the control unit 180 performs control and processing related to voice communication, data communication, video call, or the like, or performs pattern recognition processing to recognize handwriting input or drawing input performed on the touch screen as characters and images, respectively . Further, the controller 180 may control any one or a plurality of the above-described components in order to implement various embodiments described below on the mobile terminal 100 according to the present invention.

The power supply unit 190 receives external power and internal power under the control of the controller 180 and supplies power necessary for operation of the respective components. The power supply unit 190 includes a battery, the battery may be an internal battery configured to be chargeable, and may be detachably coupled to the terminal body for charging or the like.

In addition, the power supply unit 190 may include a connection port, and the connection port may be configured as an example of an interface 160 through which an external charger for supplying power for charging the battery is electrically connected.

As another example, the power supply unit 190 may be configured to charge the battery in a wireless manner without using the connection port. In this case, the power supply unit 190 may use at least one of an inductive coupling method based on a magnetic induction phenomenon from an external wireless power transmission apparatus and a magnetic resonance coupling method based on an electromagnetic resonance phenomenon Power can be delivered.

In the following, various embodiments may be embodied in a recording medium readable by a computer or similar device using, for example, software, hardware, or a combination thereof.

Referring to FIGS. 1B and 1C, the disclosed mobile terminal 100 includes a bar-shaped terminal body. However, the present invention is not limited thereto and can be applied to various structures such as a folder type, a flip type, a slide type, a swing type, and a swivel type in which a watch type, a clip type, a glass type or two or more bodies are relatively movably coupled . A description of a particular type of mobile terminal, although relevant to a particular type of mobile terminal, is generally applicable to other types of mobile terminals.

Here, the terminal body can be understood as a concept of referring to the mobile terminal 100 as at least one aggregate.

The mobile terminal 100 includes a case (for example, a frame, a housing, a cover, and the like) that forms an appearance. As shown, the mobile terminal 100 may include a front case 101 and a rear case 102. Various electronic components are disposed in the inner space formed by the combination of the front case 101 and the rear case 102. At least one middle case may be additionally disposed between the front case 101 and the rear case 102.

A display unit 151 is disposed on a front surface of the terminal body to output information. The window 151a of the display unit 151 may be mounted on the front case 101 to form a front surface of the terminal body together with the front case 101. [

In some cases, electronic components may also be mounted on the rear case 102. Electronic parts that can be mounted on the rear case 102 include detachable batteries, an identification module, a memory card, and the like. In this case, a rear cover 103 for covering the mounted electronic components can be detachably coupled to the rear case 102. Therefore, when the rear cover 103 is separated from the rear case 102, the electronic parts mounted on the rear case 102 are exposed to the outside.

As shown, when the rear cover 103 is coupled to the rear case 102, a side portion of the rear case 102 can be exposed. In some cases, the rear case 102 may be completely covered by the rear cover 103 during the engagement. Meanwhile, the rear cover 103 may be provided with an opening for exposing the camera 121b and the sound output unit 152b to the outside.

These cases 101, 102, and 103 may be formed by injection molding of synthetic resin or may be formed of metal such as stainless steel (STS), aluminum (Al), titanium (Ti), or the like.

The mobile terminal 100 may be configured such that one case provides the internal space, unlike the above example in which a plurality of cases provide an internal space for accommodating various electronic components. In this case, a unibody mobile terminal 100 in which synthetic resin or metal is connected from the side to the rear side can be realized.

Meanwhile, the mobile terminal 100 may include a waterproof unit (not shown) for preventing water from penetrating into the terminal body. For example, the waterproof portion is provided between the window 151a and the front case 101, between the front case 101 and the rear case 102, or between the rear case 102 and the rear cover 103, And a waterproof member for sealing the inside space of the oven.

The mobile terminal 100 is provided with a display unit 151, first and second sound output units 152a and 152b, a proximity sensor 141, an illuminance sensor 142, a light output unit 154, Cameras 121a and 121b, first and second operation units 123a and 123b, a microphone 122, an interface unit 160, and the like.

1B and 1C, a display unit 151, a first sound output unit 152a, a proximity sensor 141, an illuminance sensor 142, an optical output unit (not shown) A second operation unit 123b, a microphone 122 and an interface unit 160 are disposed on a side surface of the terminal body, And a mobile terminal 100 having a second sound output unit 152b and a second camera 121b disposed on a rear surface thereof.

However, these configurations are not limited to this arrangement. These configurations may be excluded or replaced as needed, or placed on different planes. For example, the first operation unit 123a may not be provided on the front surface of the terminal body, and the second sound output unit 152b may be provided on the side surface of the terminal body rather than the rear surface of the terminal body.

The display unit 151 displays (outputs) information processed by the mobile terminal 100. For example, the display unit 151 may display execution screen information of an application program driven by the mobile terminal 100 or UI (User Interface) and GUI (Graphic User Interface) information according to the execution screen information .

The display unit 151 may be a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), a flexible display display, a 3D display, and an e-ink display.

In addition, the display unit 151 may exist in two or more depending on the embodiment of the mobile terminal 100. In this case, the mobile terminal 100 may be provided with a plurality of display portions spaced apart from each other or disposed integrally with one another, or may be disposed on different surfaces, respectively.

The display unit 151 may include a touch sensor that senses a touch with respect to the display unit 151 so that a control command can be received by a touch method. When a touch is made to the display unit 151, the touch sensor senses the touch, and the control unit 180 generates a control command corresponding to the touch based on the touch. The content input by the touch method may be a letter or a number, an instruction in various modes, a menu item which can be designated, and the like.

The touch sensor may be a film having a touch pattern and disposed between the window 151a and a display (not shown) on the rear surface of the window 151a, or may be a metal wire . Alternatively, the touch sensor may be formed integrally with the display. For example, the touch sensor may be disposed on a substrate of the display or inside the display.

In this way, the display unit 151 can form a touch screen together with the touch sensor. In this case, the touch screen can function as a user input unit 123 (see FIG. 1A). In some cases, the touch screen may replace at least some functions of the first operation unit 123a.

The first sound output unit 152a may be implemented as a receiver for transmitting a call sound to a user's ear and the second sound output unit 152b may be implemented as a loud speaker for outputting various alarm sounds or multimedia playback sounds. ). ≪ / RTI >

The window 151a of the display unit 151 may be provided with an acoustic hole for emitting the sound generated from the first acoustic output unit 152a. However, the present invention is not limited to this, and the sound may be configured to be emitted along an assembly gap (for example, a gap between the window 151a and the front case 101) between the structures. In this case, the appearance of the mobile terminal 100 can be made more simple because the hole formed independently for the apparent acoustic output is hidden or hidden.

The optical output unit 154 is configured to output light for notifying the occurrence of an event. Examples of the event include a message reception, a call signal reception, a missed call, an alarm, a schedule notification, an email reception, and reception of information through an application. The control unit 180 may control the light output unit 154 to terminate the light output when the event confirmation of the user is detected.

The first camera 121a processes an image frame of a still image or a moving image obtained by the image sensor in the photographing mode or the video communication mode. The processed image frame can be displayed on the display unit 151 and can be stored in the memory 170. [

The first and second operation units 123a and 123b may be collectively referred to as a manipulating portion as an example of a user input unit 123 operated to receive a command for controlling the operation of the mobile terminal 100 have. The first and second operation units 123a and 123b can be employed in any manner as long as the user is in a tactile manner such as touch, push, scroll, or the like. In addition, the first and second operation units 123a and 123b may be employed in a manner that the user operates the apparatus without touching the user through a proximity touch, a hovering touch, or the like.

In this figure, the first operation unit 123a is a touch key, but the present invention is not limited thereto. For example, the first operation unit 123a may be a mechanical key, or a combination of a touch key and a touch key.

The contents input by the first and second operation units 123a and 123b can be variously set. For example, the first operation unit 123a receives a command such as a menu, a home key, a cancellation, a search, and the like, and the second operation unit 123b receives a command from the first or second sound output unit 152a or 152b The size of the sound, and the change of the display unit 151 to the touch recognition mode.

On the other hand, a rear input unit (not shown) may be provided on the rear surface of the terminal body as another example of the user input unit 123. The rear input unit is operated to receive a command for controlling the operation of the mobile terminal 100, and input contents may be variously set. For example, commands such as power on / off, start, end, scrolling, and the like, the size adjustment of the sound output from the first and second sound output units 152a and 152b, And the like can be inputted. The rear input unit may be implemented as a touch input, a push input, or a combination thereof.

The rear input unit may be disposed so as to overlap with the front display unit 151 in the thickness direction of the terminal body. For example, the rear input unit may be disposed at the rear upper end of the terminal body such that when the user holds the terminal body with one hand, the rear input unit can be easily operated using the index finger. However, the present invention is not limited thereto, and the position of the rear input unit may be changed.

When a rear input unit is provided on the rear surface of the terminal body, a new type of user interface using the rear input unit can be realized. When the first operation unit 123a is not disposed on the front surface of the terminal body in place of at least a part of the functions of the first operation unit 123a provided on the front surface of the terminal body, The display unit 151 may be configured as a larger screen.

Meanwhile, the mobile terminal 100 may be provided with a fingerprint recognition sensor for recognizing the fingerprint of the user, and the controller 180 may use the fingerprint information sensed through the fingerprint recognition sensor as authentication means. The fingerprint recognition sensor may be embedded in the display unit 151 or the user input unit 123.

The microphone 122 is configured to receive the user's voice, other sounds, and the like. The microphone 122 may be provided at a plurality of locations to receive stereophonic sound.

The interface unit 160 is a path through which the mobile terminal 100 can be connected to an external device. For example, the interface unit 160 may include a connection terminal for connection with another device (for example, an earphone or an external speaker), a port for short-range communication (for example, an infrared port (IrDA Port), a Bluetooth port A wireless LAN port, or the like), or a power supply terminal for supplying power to the mobile terminal 100. The interface unit 160 may be implemented as a socket for receiving an external card such as a SIM (Subscriber Identification Module) or a UIM (User Identity Module) or a memory card for storing information.

And a second camera 121b may be disposed on a rear surface of the terminal body. In this case, the second camera 121b has a photographing direction which is substantially opposite to that of the first camera 121a.

The second camera 121b may include a plurality of lenses arranged along at least one line. The plurality of lenses may be arranged in a matrix form. Such a camera can be named an 'array camera'. When the second camera 121b is configured as an array camera, images can be taken in various ways using a plurality of lenses, and a better quality image can be obtained.

The flash 124 may be disposed adjacent to the second camera 121b. The flash 124 shines light toward the subject when the subject is photographed by the second camera 121b.

And a second sound output unit 152b may be additionally disposed in the terminal body. The second sound output unit 152b may implement a stereo function together with the first sound output unit 152a and may be used for implementing a speakerphone mode in a call.

The terminal body may be provided with at least one antenna for wireless communication. The antenna may be embedded in the terminal body or formed in the case. For example, an antenna constituting a part of the broadcast receiving module 111 (see FIG. 1A) may be configured to be able to be drawn out from the terminal body. Alternatively, the antenna may be formed in a film type and attached to the inner surface of the rear cover 103, or a case including a conductive material may be configured to function as an antenna.

The terminal body is provided with a power supply unit 190 (see FIG. 1A) for supplying power to the mobile terminal 100. The power supply unit 190 may include a battery 191 built in the terminal body or detachable from the outside of the terminal body.

The battery 191 may be configured to receive power through a power cable connected to the interface unit 160. In addition, the battery 191 may be configured to be wirelessly chargeable through a wireless charger. The wireless charging may be implemented by a magnetic induction method or a resonance method (magnetic resonance method).

The rear cover 103 is coupled to the rear case 102 so as to cover the battery 191 to restrict the release of the battery 191 and to protect the battery 191 from external impact and foreign matter . When the battery 191 is detachably attached to the terminal body, the rear cover 103 may be detachably coupled to the rear case 102.

The mobile terminal 100 may be provided with an accessory that protects the appearance or supports or expands the function of the mobile terminal 100. [ One example of such an accessory is a cover or pouch that covers or accommodates at least one side of the mobile terminal 100. [ The cover or pouch may be configured to interlock with the display unit 151 to expand the function of the mobile terminal 100. Another example of an accessory is a touch pen for supplementing or extending a touch input to the touch screen.

Meanwhile, in the mobile terminal according to an embodiment of the present invention, which can include at least one of the above-mentioned components, the image capturing function can be implemented. The image photographing function can be executed based on whether the icon (or the icon of the application) associated with the image photographing function is selected (or touched). When the image photographing function is executed through the icon, the display unit 151 may be on.

Meanwhile, the image capturing function may include at least one of a key (e.g., at least one of a hardware key and a software key) included in the mobile terminal, in addition to the method of selecting the icon associated with the image capturing function , It can be executed. In this case, even if the display unit 151 is off, the control unit 180 can execute the image photographing function corresponding to the selection of the key included in the mobile terminal.

In the mobile terminal of the present invention, an image received through the camera can be displayed on the display unit 151 as the image photographing function is executed. Specifically, the mobile terminal can display the image received through the camera on the display unit 151 in real time. Here, the image received through the camera may be expressed by a 'pre-view image', an 'image', or the like.

Execution of the image photographing function may mean executing an application that is driven for image photographing. The control unit 180 of the mobile terminal can activate the camera 121 to prepare the image capturing state when the image capturing function is executed. In addition, the control unit 180 may output the image input through the activated camera 121 to the display unit 151. FIG. Herein, the image input through the activated camera 121 and output to the display unit 151 is defined as a 'preview image'. In addition, the control unit 180 may store the preview image being output to the display unit 151 in the memory unit when the image capturing operation is performed based on the user's selection.

The mobile terminal according to the present invention can provide a video shooting function for storing a video (preview video) received through a camera in a memory. Here, the operations of the mobile terminal storing images received through the camera in a memory include 'capture images',' capture images', 'capture images',' capture preview images', ' Quot ;, " take a picture with respect to a preview image ", " process with a photograph instruction with respect to a preview image ", " perform a photographing function with a preview image & Furthermore, the present invention is not limited to the above-mentioned expressions, but can be freely used as long as it means storing an image received through a camera in a memory unit.

In the present invention, the mobile terminal can perform the image photographing operation based on the selection of the user, and the selection of the user can be expressed by 'user control command' or 'control command'. For example, when a user touches or presses a hardware key provided on the mobile terminal, or when a software key and a key are displayed on the display unit 151, By touching at least one of the visual keys, an image photographing operation can be performed. That is, when at least one of a software key and a visual key is touched, the hardware key associated with the image shooting function is touched or pressed or the software key and the visual key output from the display unit 151 are touched , It can be determined that the user's control command for performing the image photographing operation has been received. Based on these control commands, the control unit 180 can photograph an image input through the camera 121. [ In addition, in addition to these examples, the image photographing function may be performed when a user voice corresponding to a command set in the mic is received, a specific gesture is applied on the mobile terminal, or a predetermined motion is detected in the mobile terminal .

Meanwhile, the mobile terminal according to the present invention may perform auto focus on the preview image outputted to the display unit 151 before performing the image photographing operation. The auto focus refers to a function of automatically adjusting the focus of the preview image being output to the display unit 151. [

Autofocus can be performed in a variety of ways. For example, the autofocus may be performed based on the fact that the preview image is retained for a predetermined time while the preview image is being output as the image capturing function is executed. Here, the output of the preview image means that the movement of the subject and the movement of the mobile terminal, which are objects to be photographed, are restricted for a predetermined time.

Also, the autofocus can be performed based on at least a part of the preview images output to the display unit. At least a part of the preview image may be an image corresponding to a predetermined area of the preview image output area. Here, the preset area refers to an area where a reference area for performing autofocus is initially set in the image photographing function when the image photographing function is performed. That is, the controller 180 can adjust the focus based on the image corresponding to the predetermined area of the preview image.

The preset area may be changed based on the user selection. For example, in a state where the preview image is output, the preset area may be changed around a point where the touch is applied, when a touch is applied to an area where the preview image is output.

Hereinafter, the preset area serving as a reference for performing autofocus on the preview image is defined as a 'focus area 400'. A method of performing autofocus on a preview image based on the focus area 400 will be described in more detail with reference to FIGS. 4A to 4D.

Meanwhile, in the process of performing autofocus, when the image corresponding to the focus area of the preview image satisfies a preset condition, the mobile terminal adjusts the focus based on the focus area, , And can capture a preview image based on a user control command.

On the other hand, the control unit 180 of the mobile terminal may vary the size of the focus area when the image corresponding to the focus area of the preview image does not satisfy the predetermined condition.

Here, the preset condition means whether or not a boundary part is included in the focus area based on hues. Specifically, when a boundary portion that is classified based on hues is included in the focus region, the controller 180 may perform autofocus using the boundary portion. That is, when the boundary portion is included in the focus region, the controller 180 may perform autofocus using the boundary portion included in the focus region. In addition, when the boundary portion is not included in the focus region, the controller 180 may vary the size of the focus region so that the boundary portion is divided in the focus region based on the color.

Hereinafter, a method of varying the size of a focus area according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a flowchart illustrating an exemplary control method of the present invention, and FIG. 3 is a conceptual diagram illustrating a control method illustrated in FIG. 2. Referring to FIG.

Referring to FIG. 2, as the image capturing function is executed based on a user request, a preview image 300 received through a camera is output to the display unit 151 (S210). When the image photographing function is executed, the display unit 151 may be on. The preview image 310 may be output to an output area of the display unit 151. [ 3 (a), a preview image 310 may be output to the display unit 151 in the output area of the display unit 151. [ The area to which the preview image 300 described below is output may be understood as an output area of the display unit 151.

A boundary part 500, which is distinguished on the basis of the color included in the image 310, in the image 310 corresponding to the focus area 400 having a predetermined size among the preview images 300, The process of controlling the size of the focus area 400 is performed based on whether the focus area 400 is included in the focus area 400 or not (step S220).

More specifically, when the boundary portion 500 is included in the focus region 400, the controller 180 can maintain the size of the focus region 400 at the predetermined size.

The control unit 180 may enlarge the size of the focus area 400 having the predetermined size when the boundary part 500 is not included in the focus area 400. [ At this time, the controller 180 may enlarge the size of the focus area 400 until the boundary part 500 is included in the focus area 400 based on the colors included in the preview image.

For example, as shown in FIG. 3 (a), when the image photographing function is performed, the preview image 300 received through the camera may be output to the display unit 151. Here, the control unit 180 may vary the size of the focus area based on whether or not a boundary portion that is distinguished based on colors is included in the focus area 400 having a predetermined size.

As shown in FIG. 3 (a), a boundary part 500, which is distinguished based on a color included in the image, is included in the image 310 corresponding to the focus area 400 of the preview image 300, May not be included in the focus area 400.

In this case, as shown in FIG. 3 (b), the controller 180 may enlarge the size of the focus area 400 having a predetermined size. Specifically, if the boundary part is not included based on the color included in the image 300 corresponding to the focus area 400, the control unit 180 divides the image based on the color included in the preview image 310 The size of the focus region 400 may be enlarged such that the boundary portion 500 is included in the focus region.

The control unit 180 controls the boundary portion 500 included in the focus region 400 so that the boundary portion 500 includes the boundary portion based on the color in the enlarged focus region as the size of the focus region 400 increases. It is possible to perform autofocus on the preview image 300. [

Meanwhile, as shown in FIG. 3, an indicator 410 may be displayed on the display unit 151 to guide the focus area. The indicator 410 may be displayed to identify the size of the focus area so as to guide the focus area. Specifically, the control unit 180 may output the indicator 410 to the display unit 151 to correspond to the focus area.

The indicator 410 serves to guide a focus area. In addition, the controller 180 may be used to guide whether the auto focus of the preview image is completed or not, using the indicator 410.

For example, the indicator 410 may guide the focus area 400 before autofocus is performed. Here, if the size of the focus area is changed in step S220, the indicator 410 may be displayed so as to correspond to the focus area having the changed size. That is, when changing the size of the focus area 400, the controller 180 may change the indicator 410 so that the size of the focus area may be changed.

The graphical effect may be applied to the indicator 410 to notify that the autofocus has been performed when the autofocus is performed in accordance with the presence of a boundary portion based on the hue in the focus region 400. The graphical effect may be, for example, a color change.

In addition, when autofocus is performed on the preview image, the indicator 410 can be resized so that the focused part of the preview image can be identified. For example, as shown in FIG. 7 (b), the focused portion may be a boundary portion 500 that is distinguished based on a color included in the focus region 400.

Meanwhile, at least one focus area may be set in the mobile terminal according to an exemplary embodiment of the present invention. In this case, the controller 180 may perform autofocus around a focus area including a boundary part of the at least one focus area based on hues, in a state where the at least one focus area is set.

Here, if the at least one focus region does not include a boundary portion based on colors, the controller 180 may additionally set a new focus region. Specifically, when the boundary portion is not included in the at least one focus region, the control unit 180 may set a new focus region until the boundary portion is included in the focus region.

When a new focus area is additionally set, the controller 180 may perform autofocus on the preview image based on the new focus area when the new focus area includes a boundary portion based on hues . Specifically, the controller 180 may perform autofocus on the preview image using a boundary portion based on the colors included in the new focus region.

Hereinafter, a method of determining whether or not a boundary portion based on hues is included in a focus area and a method of performing autofocus will be described in more detail with reference to the accompanying drawings.

FIGS. 4A, 4B, 4C, and 4D are conceptual diagrams for explaining a method for determining whether or not a boundary portion, which is distinguished based on hues, is included in a focus region.

The control unit 180 may move the lens provided on the camera 121 in order to perform autofocus on the preview image 300 based on the direction of the camera. Specifically, the controller 180 may move in a direction (hereinafter, referred to as 'forward direction') toward the camera, or may move in a direction opposite to the direction in which the camera is oriented The lens can be moved.

The lens may be movable within a movable range. The movable range may vary depending on the hardware structure of the camera or the control of the control unit. Hereinafter, the distance where the lens is located is defined as a camera lens step. For example, as shown in (a) of FIG. 4A, the position where the lens has moved the maximum in the direction opposite to the direction in which the camera is directed may be defined as a camera lens step of '0'.

The control unit 180 can move the lens 121 back and forth to acquire at least two preview images 300 having different focal distances. Here, the focal length may mean a distance between a camera and a subject to which a preview image is focused. For example, when the camera lens step of the lens is 0, the control unit can obtain the preview image having the furthest focal length. When the camera lens step becomes large (when the lens moves in the direction in which the camera is facing), the focal length becomes short. That is, the controller 180 decreases the camera lens step to obtain a preview image focused on a relatively far object, increases the camera lens step, and obtains a preview image focused on a relatively close object .

On the other hand, the fact that the focus is aligned may mean that the boundary part 500, which is distinguished based on the colors included in at least a part of the preview image, is sharpest. At least a part of the preview image may be an image 310 corresponding to the focus area 400. [

Specifically, at least two preview images obtained by moving the lens back and forth can be formed in different colors as they have different focal lengths. Specifically, the obtained at least two preview images have different sharpness as they have different focal lengths. That is, having different sharpness means that they have different colors. That is, when a boundary part 500 is defined in the image 310 corresponding to the focus area of the preview image based on the color, the color of the image 310 corresponding to the focus area is different . In addition, as the color of the image 310 corresponding to the focus area is changed, the color of the boundary part 500 is changed.

For example, as shown in FIGS. 4A to 4C, the controller 180 may move at least two preview images having different focal distances by moving a lens provided in the camera. Comparing FIGS. 4A and 4B, the obtained at least two preview images have different focal lengths, so that they can be formed in different colors. As a result, as shown in FIGS. 4A and 4B, the sharpness of the boundary part 500, which is distinguished based on the colors included in the image 310 corresponding to the focus area 400 of the preview image, .

The control unit 180 may perform autofocus such that the boundary portion 500 that is distinguished based on the colors included in the focus region 400 is sharpest. That is, the control unit 180 determines that the boundary part 500, which is distinguished based on the color included in the image 310 corresponding to the focus area 400, It is possible to perform autofocusing.

Hereinafter, a method for determining whether or not a boundary part 500, which is distinguished based on a color included in an image 310 corresponding to a focus area of the preview image, is included in the focus area 400 will be described in more detail do.

The control unit 180 may analyze the image corresponding to the focus area 400 having a predetermined size to determine whether the boundary 500 is divided in the focus area 400 based on the color. The determination may be performed using, for example, an edge filter.

For example, as shown in FIG. 4B, it is assumed that an image corresponding to the focus area 400 of the preview image is composed of nine pixels. In addition, the edge filter used for determining whether or not the boundary portion exists is exemplified as a sobel edge filter as shown in Fig. 4B (b). However, the present invention is not limited to this, and it is obvious that various methods for extracting the boundary portion based on the color in the preview image can be applied.

The control unit 180 applies an edge filter to the image 310 corresponding to the focus area 400 of the preview image 300 for the preview image 300 output to the display unit 151, It is possible to determine whether or not the boundary portion 500 exists.

When the preview image 300 is output to the display unit 151, the controller 180 determines whether the focus value or the focus value FV of the image 310 corresponding to the focus area 400 of the preview image, Can be extracted.

A method of extracting the focus value is as follows.

Each of the pixels (for example, P1 to P9) constituting the image 310 corresponding to the focus area 400 of the preview image includes color information (for example, RGB values (0 to 255)) .

The control unit 180 may apply a sobel x and a soble y filter to each of pixels constituting the image 310 corresponding to the focus region 400 to extract a focus value for the focus region 400 have.

For example, the controller 180 may calculate a sobel x1 value for P1 by applying a sobel x filter based on P1, as shown in Fig. 4 (c). The value of the sobel x1 is calculated by, for example, (g1 * (- 1)) + (g2 * 0) + (g3 * ) + (g5 * (- 1)) + (p4 * 0) + (p5 * 1).

Here, g1 to g5 and p1, p2, p4 and p5 denote color information (for example, RGB values) included in each pixel.

In this way, the controller 180 may calculate a sobel x value for each of the pixels constituting the image 310 corresponding to the focus area 400 using a sobel x filter (for example, Sobel x1 value for p2, soble x2 value for p2, ..., sobel x9 value for p9).

Next, the controller 180 may calculate a soble y value for each pixel constituting the image 310 corresponding to the focus area 400 using the sobel y filter (for example, , The sobel y1 value for P1, the soble y2 value for P2, ..., the sobel y9 value for P9).

The control unit 180 may calculate the focus value FV for the image 310 corresponding to the focus region 400 using the calculated sobel x value and the calculated sobel y value. For example, the focus value FV may be a sum of the absolute value of the sum of the sobel x values and the absolute value of the sum of the sobel y values (for example, FV = | sobel x 1 value + sobel x 2 value + ... + sobel x9 | + | sobel y1 value + sobel y2 value + ... + sobel y9 |

That is, the greater the number of boundary portions 500 that are distinguished based on the colors included in the image 310 corresponding to the focus region 400, the larger the focus value FV becomes. In addition, the focus value FV becomes larger as the color difference of the boundary portion 500 becomes larger (for example, the greater the difference between the RGB values).

Meanwhile, the controller 180 may calculate the focus value FV for each position of the lens. Specifically, the control unit 180 can move the lens to acquire at least two preview images having different focal distances. For example, using the first preview image received through the lens positioned at the first point, the controller 180 calculates a first focus value (FV) for the image corresponding to the focus area 400 of the first preview image ) Can be calculated. Thereafter, the control unit 180 may move the lens positioned at the first point to the second point. The controller 180 may calculate the second focus value FV corresponding to the focus area 400 of the second preview image using the second preview image received through the lens located at the second point.

The control unit 180 may determine whether the boundary 500 is included in the focus area 400 using the obtained at least two preview images. The control unit 180 extracts a focus value for the image 310 corresponding to the focus area 400 from the obtained at least two preview images and determines whether the focus value of the acquired at least two preview images is a threshold value It can be determined that the boundary portion 500 is included in the focus area 400. In this case,

For example, as shown in (a) of FIG. 4C, a boundary part 500, which is distinguished based on the colors included in the image 310 corresponding to the focus area 400 of the preview image 300, When included in the area 400, the graph of the focus value according to the position of the lens may be as shown in FIG. 4C (b). If there is a preview image exceeding the threshold value among the extracted focus values among the acquired at least two preview images, the control unit 180 determines that there is a boundary part 500 that is distinguished based on colors in the focus area 400 . At this time, the controller 180 can position the lens at the point having the largest focus value. As a result, the display unit 151 outputs the preview image having the sharpest image corresponding to the focus area of the preview image. Through this process, the control unit 180 can perform autofocus on the preview image 300. [

4D, a boundary part 500, which is distinguished based on the colors included in the image 310 corresponding to the focus area 400 of the preview image 300, 400, the graph of the focus value according to the position of the lens may be the same as that shown in (b) of FIG. 4D. The control unit 180 may determine that the boundary part 500 is not included in the focus area 400 when there is no preview image whose focus value exceeds the threshold value among the acquired at least two preview images . The control unit 180 may enlarge the size of the focus area 400 having a predetermined size so that a boundary portion defined on the basis of the color included in the preview image 300 is included in the focus area 400 . In this case, the controller 180 may enlarge the size of the focus area until the boundary part, which is divided based on the color included in the preview image, is included in the focus area.

According to the present invention, the autofocus can be performed using a boundary portion that is divided based on colors included in the focus region. Further, according to the present invention, when the boundary portion is not included in the focus region, the size of the focus region may be enlarged so that a boundary portion that is divided based on the hue is included in the focus region.

Therefore, in the present invention, when the autofocus is not properly performed due to the fact that the boundary portion based on the color does not include the focus region, the size of the focus region is enlarged so that the boundary portion is included in the focus region, can do. Thus, the present invention can provide an optimized autofocus function. In addition, when the autofocus is not performed, the user can be provided with an optimized autofocus function without moving the mobile terminal separately or specifying a focus area separately, thereby improving convenience.

Hereinafter, a method for controlling the timing of changing the size of the focus area differently will be described in detail with reference to the accompanying drawings.

FIGS. 5A and 5B are conceptual diagrams for explaining a method for controlling the timing of changing the size of the focus region differently when the boundary portion is not included in the focus region.

The controller 180 of the present invention can control the magnification of the size of the focus area differently. The control unit 180 controls the focus region 400 so that the boundary portion 500 is included in the focus region 400 when the boundary portion 500 is not present in the focus region 400, 400) can be controlled differently.

For example, as shown in FIG. 5A (a), the control unit 180 moves the lens with respect to all of the movable range to acquire at least two preview images having different focal distances. The control unit 180 then extracts a focus value FV for the image 310 corresponding to the focus area 400 having a predetermined size according to lens positions using the obtained at least two preview images. If the focus value FV exceeding the threshold value does not exist in the extracted focus value FV, the controller 180 determines that the boundary portion is not included in the focus region 400 based on the hue. Then, the control unit 180 enlarges the size of the focus area 400 having a predetermined size, as shown in (b) of FIG. 5A.

Thereafter, the controller 180 moves the lens again with respect to all of the movable range in order to determine whether or not there is a boundary portion 500 that is distinguished based on colors in the enlarged focus area 400 And obtains at least two preview images having different focal distances.

Here, as shown in FIG. 5A, the controller 180 re-extracts the focus value FV for the enlarged focus area 400 using the at least two preview images. If any one of the extracted focus values FV exceeds the threshold value, the control unit 180 determines that the boundary 500 exists in the enlarged focus area 400, can do.

Thereafter, the controller 180 positions the lens at a position having the maximum focus value FV based on the focus value FV for each lens position with respect to the enlarged focus area 400 to perform autofocusing . In this case, the preview image 300 output to the display unit 151 may be an image in which the image corresponding to the enlarged focus area 400 is the sharpest.

The control unit 180 may change the color of the indicator 410 displayed to correspond to the enlarged focus area 400 so as to notify that autofocus has been performed, as shown in FIG.

With the above arrangement, the present invention can improve the autofocus accuracy by moving the lens with respect to all of the movable range and judging that the boundary portion 500 exists in the focus area 400, which is distinguished based on the color .

Meanwhile, the control unit 180 may determine whether or not the boundary 500, which is distinguished based on the color, is included in the focus area 400 after moving the lens only a part of the movable range of the lens.

For example, as shown in FIG. 5B (a), the control unit 180 can move at least a part of the movable range of the lens to obtain at least two preview images having different focal distances. Thereafter, the controller 180 may extract the focus value FV for the focus area 400 using the obtained at least two preview images.

In this state, the controller 180 can determine whether or not the boundary portion 500 that is distinguished based on the hue exists in the focus region 400 using the extracted focus value FV. The determination may be performed based on at least one of whether or not there is a focus value exceeding a threshold value among the extracted focus values FV and whether or not the variation amount of the focus value is larger than the reference variation amount.

For example, when there is no focus value exceeding the threshold value among the extracted focus values FV, the controller 180 determines that there is no boundary part 500 that is distinguished based on colors in the focus area 400 It can be judged. If the amount of change of the extracted focus value FV is smaller than the reference change amount, the controller 180 may determine that the boundary portion 500 is not present in the focus region 400 based on the hue.

If the control unit 180 determines that the boundary 500 is not present in the focus area 400 based on the color in a state in which the lens is moved only a part of the movable range of the lens, The size of the focus area 400 can be enlarged in the moved state.

Then, as shown in FIG. 5B, the control unit 180 may move at least a part of the moved lens to obtain at least two preview images having different focal distances. The control unit 180 may then extract the focus value FV for each position of the lens with respect to the enlarged focus region 400 using the obtained at least two preview images.

The control unit 180 may determine whether a boundary 500 is present in the enlarged focus area 400 based on the color using the extracted focus value FV. If any one of the extracted focus values FV exceeds the threshold value, the controller 180 determines that the boundary 500 exists in the enlarged focus area 400, can do.

Thereafter, the controller 180 positions the lens at a position having the maximum focus value FV based on the focus value FV for each lens position with respect to the enlarged focus area 400 to perform autofocusing . In this case, the preview image 300 output to the display unit 151 may be an image in which the image corresponding to the enlarged focus area 400 is the sharpest.

The control unit 180 may change the color of the indicator 410 displayed to correspond to the enlarged focus area 400 so as to notify that autofocus has been performed, as shown in FIG.

According to the present invention, by moving the lens only a part of the movable range and judging that the boundary part 500 exists in the focus area 400 based on the color, the speed of the autofocus can be increased have.

Hereinafter, a method of setting a focus area according to an embodiment of the present invention and a method of changing an indicator when autofocus is performed will be described in detail with reference to the accompanying drawings.

FIG. 6 is a conceptual diagram for explaining a method of setting a focus area according to an embodiment of the present invention. FIG. 7 is a flowchart illustrating a method of setting a focus area according to an embodiment of the present invention when a boundary part , And a conceptual diagram for explaining how the indicator is displayed.

6, at least one of the position and size of the focus area 400 of the present invention may be changed based on a user request. First, when the preview image 300 is displayed on the display unit 151 as the image capturing function is performed, the controller 180 can set the focus region 400 having a predetermined size to a predetermined position. 6 (a), when the touch is applied to the area in which the preview image 300 is output, the control unit 180 determines whether or not the touch It is possible to set the focus area 400 around the point where the < RTI ID = 0.0 > The focus area 400 set around the point where the touch is applied may have a predetermined size.

The controller 180 may perform autofocus around the focus area 400 based on the touch. Specifically, when a touch is applied to the area where the preview image 300 is output, the control unit 180 can set the focus area 400 around the point where the touch is applied. Thereafter, the controller 180 moves the lens to acquire at least two preview images having different focal distances, and acquires at least two preview images using the acquired preview images, The focus value FV for each lens position can be extracted.

6 (b), if there is no focus value exceeding the threshold value among the extracted focus values FV, the control unit 180 determines whether the focus value The size of the focus area 400 set based on the touch can be enlarged. Here, the controller 180 may control the magnification of the size of the set focus area 400 differently based on the touch, and the above description may be applied to the contents described in FIGS. 5A and 5B.

When the size of the set focus area 400 is enlarged based on the touch, the controller 180 controls the size of the enlarged focus area 400 to be enlarged It is possible to place the lens at a point having a maximum focus value FV among the focus values FV for the focused focus area 400 to perform autofocusing. 6C, the controller 180 may display the color of the indicator 410 corresponding to the enlarged focus area 400 so as to notify that the autofocus has been performed, have.

Meanwhile, when the autofocus is performed on the basis of the focus area 400, the controller 180 may display the indicator 410 corresponding to the focus area 400 differently.

For example, as shown in FIG. 7 (a), when the boundary portion 500 that is distinguished based on hues is included in the focus region 400 having a predetermined size, Can be performed.

In this case, as shown in FIG. 7 (b), the controller 180 can display the position where the indicator 410 is displayed by changing it to a position corresponding to the boundary portion 500.

Specifically, the controller 180 extracts a focus value FV for the focus region 400 to determine whether or not a boundary portion 500 exists in the focus region 400 based on colors . The control unit 180 can determine the position of the boundary part 500 located in the focus area 400 based on at least one of the sobel x value and the sobel y value generated in the process of extracting the focus value FV have. For example, the controller 180 may determine that a portion where at least one of the sobel x value and the sobel y value exceeds a threshold value is a portion where the boundary portion 500 is divided based on the hue.

The control unit 180 may display the indicator 410 corresponding to the boundary region 500 to correspond to the focus region 400. [ In addition, the controller 180 may change the color of the indicator displayed to correspond to the boundary portion 500 to guide that the autofocus has been performed.

Through the above-described configuration, the present invention can guide where the sharpest part (boundary part) of the focus area is by changing the display position of the indicator 410 to correspond to the boundary part.

Hereinafter, a method for controlling a focus area differently in order to perform autofocus on a preview image according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 8A, 8B, 8C, and 8D are diagrams for explaining a method for additionally setting a new focus area in a case where a boundary part based on hue is not included in the focus area according to an embodiment of the present invention It is a conceptual diagram.

First, the control unit 180 can set at least one focus area 400. FIG. For example, as shown in FIG. 8A, the controller 180 may set at least one focus area 400a to 400d for performing autofocus on the preview image 300. FIG.

Thereafter, the control unit 180 can move the lens to acquire at least two preview images having different focal distances. Also, the controller 180 may extract the focus value FV for each of the at least two focus areas 400a to 400d using the obtained at least two preview images.

Here, if there is no focus value exceeding the threshold value among the focus values FV for the at least two focus areas, the controller 180 determines whether the focus value FV for the at least two focus areas It can be determined that the tilted portion separated based on the color is not included in the at least one focus region.

Thereafter, the controller 180 may further set a new focus area 400e as shown in (b) of FIG. 8A. The new focus area 400e may be set around at least one of the predetermined focus areas 400a to 400d. In addition, the number of the new focus areas to be additionally set may be changed according to the user setting or the control of the controller. In addition, the position and size of the further new focus area may be changed according to user setting or control of the controller.

The control unit 180 may further set a new focus area until a boundary portion that is distinguished based on the color is included in the new focus area.

The new focus area is further set by moving the lens with respect to all of the movement range of the lens, as described in FIG. 5A, after determining whether the boundary is included in at least one of the focus areas 400a to 400d . Further, the time for further setting the new focus area may be determined after moving the lens by a part of the moving range of the lens to determine whether or not the boundary portion in at least one focus area 400a to 400d is included.

The control unit 180 extracts a focus value for the new focus area 400e and if the focus value exceeds the threshold value among the extracted focus values FV, It is possible to perform autofocus on the basis of the reference value. That is, the controller 180 positions the lens at a position having a maximum focus value among the focus values of the new focus area 400e with respect to the new focus area 400e, so that the boundary part 500 included in the new focus area 400e It is possible to output the sharpest preview image to the display unit 151. [

Thereafter, the display unit 151 may output an indicator 410 corresponding to the new focus area 400e so as to inform that the autofocus has been performed based on the new focus area 400e. If the indicator 410 is displayed in at least one of the focus areas 400a to 400d and the new focus area 400e in advance, the controller 180 controls the indicator 410 corresponding to the new focus area 400e You can change the color. Also, the controller 180 may limit the output of the indicator displayed in the focus area that does not include the boundary part 500 of the at least one focus area 400a to 400d.

On the other hand, the number of additional new focus areas may be at least two. Specifically, if the boundary portion 500 is not included in at least one predetermined focus region based on the hue, the controller 180 may add at least two new focus regions.

For example, as shown in (a) of FIG. 8B, when the at least one focus region 400a to 400d does not include the tilted portion 500 classified based on the color, May further set up at least two new focus areas 400e through 400i. The at least two new focus areas 400e to 400i may be set around at least one predetermined focus area 400a to 400d. In addition, the controller 180 can additionally set the at least two new focus areas until a boundary portion, which is classified based on the hue, is included in the new focus area.

The time at which the at least two new focus areas are added is replaced with the description of Figs. 5A, 5B and 8A described above.

Returning again to FIG. 8B, if the boundary portion 500, which is distinguished based on colors, is included in at least two additional new focus areas 400e to 400i set as shown in FIG. 8B, Can perform autofocus based on the new focus areas 400e to 400i including the boundary portion 500. [

For example, as shown in (c) of FIG. 8B, the controller 180 performs autofocus based on the focus areas 400e to 400i including the boundary portions 500 that are distinguished based on colors . Thereafter, the controller 180 may output the indicator 410 to the focus areas 400e to 400i including the boundary part 500 classified based on the color, so that the autofocus is performed.

On the other hand, when at least two focus areas include boundary portions that are distinguished based on colors, the controller 180 may perform autofocus based on at least one of the at least two focus areas.

For example, as shown in (a) of FIG. 8C, when the boundary portion 500 is not included in at least one of the predetermined focus areas 400a to 400d, , At least two new focus areas 400e to 400i can be additionally set.

Thereafter, the controller 180 may determine whether or not a boundary portion that is distinguished based on colors is included in the at least two new focus areas 400e to 400i.

The control unit 180 sets the at least two new focus areas 400e to 400i and moves the lens to obtain at least one preview image having a different focal distance. 8C, the control unit 180 sets the predetermined focus areas 400a to 400d and the new focus areas 400e to 400i using the obtained at least two preview images, The focus value FV for each lens position can be extracted.

Thereafter, the control unit 180 can select a focus region that is a reference of autofocus using the extracted focus value. For example, as shown in (b) of FIG. 8C, in a state in which the focus value FV for the focus areas 400e to 400i is extracted, the controller 180 calculates a focus value FV (Not shown).

For example, when the threshold value is 200, the controller 180 can select the focus areas 400e, 400f, and 400g.

In other words, when the threshold is 100, the controller 180 selects the focus area 400e having the maximum focus value among the focus areas 400e, 400f, 400g, 400h, and 400g, (400f, 400g) having a focus value corresponding to the focus range (400f, 400g).

Thereafter, the controller 180 may perform autofocusing by positioning the lens at a point having a maximum focus value among the focus values for the selected focus areas 400e to 400g. In addition, the controller 180 displays an indicator on the selected focus area 400e to 400g so that the selected focus area can be identified as a reference of autofocus among the plurality of focus areas, or when the indicator is already displayed, Can be changed.

If the control unit 180 does not include at least one of the focus areas 400a to 400d in the focus area classified based on the hue, A new focus area 400e or 400f can be set at a position corresponding to at least one of the focus areas 400e and 400f.

Specifically, when the preview image 300 is output to the display unit 151 as the image capturing function is performed, the controller 180 applies an edge filter to the entire preview image 300 to extract a focus value .

Thereafter, the controller 180 may determine the position of the boundary portion based on the color based on the sobel x value and the sobel y value for each pixel calculated in the process of extracting the focus value.

8D, the control unit 180 determines whether or not the boundary portion 500 that is distinguished based on the color is included in at least one of the predetermined focus areas 400a to 400d (see FIG. 8D) can do.

In a case where a boundary part that is distinguished based on hues is not included in at least one of the predetermined focus areas 400a to 400d, the controller 180 may include in the preview image as shown in (b) of FIG. New focus areas 400e and 400f can be set at positions corresponding to at least a part of the boundary portions that are distinguished based on the colors.

The control unit 180 then moves the lens to extract the focus value FV for the new focus areas 400e and 400f and determines whether the extracted focus value FV exceeds the threshold value and the maximum focus value It is possible to position the lens at a position corresponding to the focus position FV. The control unit 180 outputs the indicator 410 to correspond to the focus area 400e having the maximum focus value FV or changes the color of the indicator 410 that has been output, The focus area 400e can be guided.

The contents of performing the autofocus using the back and forth movement of the lens provided in the camera described above are the same when the camera itself moves back and forth (for example, when the camera itself moves back and forth by an external module mounting the camera) / Similar analogy would be applicable.

The present invention can perform autofocus by varying the size and the number of the focus area when there is no boundary part that is divided on the basis of color in the focus area. Therefore, the present invention can provide an autofocus function optimized for using a video image shooting function.

The present invention described above can be implemented as computer readable codes on a medium on which a program is recorded. The computer readable medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of the computer readable medium include a hard disk drive (HDD), a solid state disk (SSD), a silicon disk drive (SDD), a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, , And may also be implemented in the form of a carrier wave (e.g., transmission over the Internet). In addition, the computer may include a control unit 180 of the terminal. Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

Claims (19)

camera;
A display unit for outputting a preview image received through the camera; And
A control unit for controlling the size of the focus area based on whether or not a boundary part, which is distinguished based on a color included in the image, is included in the focus area in an image corresponding to a focus area having a predetermined size in the preview image, Lt; / RTI >
Wherein,
Wherein when the boundary portion is included in the focus region, the size of the focus region is maintained at the predetermined size,
And further sets a new focus area when the boundary part is not included in the focus area. delete The method according to claim 1,
Wherein the focus area is changeable based on a touch applied to an area where the preview image is output. The method according to claim 1,
And an indicator for guiding the focus area is displayed on the display unit. 5. The method of claim 4,
Wherein the indicator is displayed to correspond to a focus area having the changed size when the size of the focus area is changed. The method according to claim 1,
Wherein,
Moving the lens provided in the camera to obtain at least two preview images having different focal distances and determining whether the boundary portion is included in the focus area using the obtained at least two preview images The mobile terminal comprising: The method according to claim 6,
Wherein the acquired at least two preview images are formed in different colors with different focal lengths. 8. The method of claim 7,
Wherein,
Extracting a focus value for an image corresponding to the focus area in the obtained at least two preview images, and if there is a preview image in which the focus value exceeds a threshold value among the obtained at least two preview images, And determines that the boundary portion is included in the region. The method according to claim 6,
The lens is movable within a movable range,
Wherein,
Determining whether the boundary portion is included in the focus region after moving the lens with respect to all of the movable range, and varying the size of the focus region based on the determination result. The method according to claim 6,
Wherein the control unit determines whether the boundary portion is included in the focus area after moving the lens only a part of the movable range of the lens. 11. The method of claim 10,
Wherein the determination is made based on a change amount of a focus value of an image corresponding to the extracted focus region while the lens is moved by the portion. 12. The method of claim 11,
Wherein,
And determines that the boundary portion is not included in the focus region when the variation amount of the focus value is smaller than the reference variation amount. 11. The method of claim 10,
Wherein,
Enlarging a size of the focus area in a state in which the lens is moved by the part when it is determined that the boundary part is not included in the focus area,
Wherein the controller determines whether the boundary portion is included in the enlarged focus region by moving the lens moved by the portion. delete The method according to claim 1,
And the new focus area is set around the focus area. The method according to claim 1,
The control unit
And sets the new focus area until the new focus area includes a boundary part based on colors. The method according to claim 1,
Wherein the new focus area comprises:
Wherein the preview image is set at a position corresponding to at least a part of a boundary section based on a color included in the preview image. Outputting a preview image received through a camera; And
Controlling a size of the focus area based on whether or not a boundary part, which is distinguished based on a color included in the image, is included in the focus area in an image corresponding to a focus area having a predetermined size in the preview image Lt; / RTI >
Wherein the controlling comprises:
Wherein when the boundary portion is included in the focus region, the size of the focus region is maintained at the predetermined size,
And if the boundary portion is not included in the focus area, a new focus area is additionally set. 19. The method of claim 18,
Wherein the controlling comprises:
Wherein the new focus area is additionally set until a boundary part is included in the focus area based on colors included in the preview image.

Images