KR102619302B1 - Mobile terminal cradle providing tracking function in conjuction with mobile terminal - Google Patents

Abstract

A terminal holder according to a technical aspect of the present invention has a portable terminal mounted on it, a rotating part that rotates to change the forward direction of the portable terminal, and is connected to communication with the portable terminal, based on a control signal provided from the portable terminal. It may include a main body portion that rotates the rotating portion. Here, the mobile terminal detects a subject in the front image captured in the front direction, and generates the control signal so that the front of the mobile terminal follows the subject in response to the detected movement of the subject, The rotational drive speed of the rotating part can be set by reflecting the distance between the position of the subject in the front image and a preset central part in the front image.

Description

{Mobile terminal cradle providing tracking function in conjuction with mobile terminal}

The present invention relates to a terminal holder that provides a tracking function in conjunction with a portable terminal.

With the advancement of electronic and communication technology, the performance and functions of portable terminals are also developing. For example, portable terminals have developed camera functions, storage functions, etc. in addition to long-distance and short-distance wireless communication functions. Accordingly, it has become possible to utilize the functions of existing cameras or camcorders using a single portable terminal.

When capturing video using such a portable terminal, a person directly manipulates the portable terminal to capture the image or fixes the portable terminal to a fixation device such as a tripod.

However, when a person takes pictures directly, it is possible to take pictures freely, such as by moving the imaging direction of the camera, but there is a limitation in that shaking is caused as the person fixes the camera. On the other hand, when using a fixing device such as a tripod, there is a limitation in that only shooting is possible from a specific angle.

Korean Patent Publication No. 10-2021-0042002

One technical aspect of the present invention is to solve the problems of the prior art described above. According to the embodiment disclosed in this document, the mobile terminal controls the operation of the terminal holder to capture images even when the subject is moving. .

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

One technical aspect of the present invention proposes a terminal holder that provides a tracking function in conjunction with a portable terminal. The terminal holder, on which the mobile terminal is mounted, has a rotating part that rotates to change the forward direction of the mobile terminal, is connected to communication with the mobile terminal, and rotates the rotating part based on a control signal provided from the mobile terminal. It may include a main body. Here, the mobile terminal detects a subject in the front image captured in the front direction, and generates the control signal so that the front of the mobile terminal follows the subject in response to the detected movement of the subject, The rotational drive speed of the rotating part can be set by reflecting the distance between the position of the subject in the front image and a preset central part in the front image.

The means for solving the above problems do not enumerate all the features of the present invention. Various means for solving the problems of the present invention can be understood in more detail by referring to specific embodiments in the detailed description below.

According to the present invention, one or more of the following effects are achieved.

According to an embodiment disclosed in this document, the mobile terminal controls the operation of the terminal holder, so that the mobile terminal tracks and aims the moving subject even in situations where the subject is moving, so that it can detect the moving subject without user intervention. Shooting can be performed.

In addition, according to the embodiment disclosed in this document, there is an effect of efficiently and quickly detecting and tracking the location of the subject.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a diagram illustrating a terminal holder and a portable terminal interoperating with the terminal holder according to an embodiment disclosed in this document.
Figure 2 is a block diagram illustrating a terminal holder according to an embodiment disclosed in this document.
Figure 3 is a block diagram illustrating a portable terminal according to an embodiment disclosed in this document.
4 is a flowchart illustrating an example of a terminal holder control method performed in a mobile terminal according to an embodiment disclosed in this document.
FIGS. 5 to 7 are diagrams for explaining an example of the control method of the terminal holder shown in FIG. 4.
8 is a flowchart illustrating another example of a terminal holder control method performed in a portable terminal according to an embodiment disclosed in this document.
FIGS. 9 to 12 are diagrams for explaining another example of the control method of the terminal holder shown in FIG. 8.
FIG. 13 is a flowchart illustrating another example of a terminal holder control method performed in a portable terminal according to an embodiment disclosed in this document.
FIG. 14 is a diagram for explaining another example of the control method of the terminal holder shown in FIG. 13.

Hereinafter, preferred embodiments of the present invention will be described with reference to the attached drawings.

However, the embodiments of the present invention may be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Additionally, the embodiments of the present invention are provided to more completely explain the present invention to those with average knowledge in the relevant technical field.

The various embodiments of this document and the terms used herein are not intended to limit the technical features described in this document to specific embodiments, and should be understood to include various changes, equivalents, or replacements of the embodiments. In connection with the description of the drawings, similar reference numbers may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of the above items, unless the relevant context clearly indicates otherwise. In this document, “A or B”, “at least one of A and B”, “at least one of A or B”, “A, B or C”, “at least one of A, B and C” and “A, Each of phrases such as “at least one of B, or C” may include any one of the items listed together in the corresponding phrase, or any possible combination thereof. Terms such as “first”, “second”, or “first” or “second” may be used simply to distinguish one element from another and refer to those elements in other respects (e.g. (importance or order) is not limited. One (e.g., first) component is “coupled” to another (e.g., second) component, with or without the terms “functionally” or “communicatively.” When referred to as “connected” or “connected,” it means that any component can be connected to the other component directly or through a third component.

The term “module” used in this document may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic block, component, or circuit, for example. A module may be an integrated part or a minimum unit of the parts or a part thereof that performs one or more functions. For example, according to one embodiment, the module may be implemented in the form of an application-specific integrated circuit (ASIC).

Various embodiments of this document include one or more instructions stored in a storage medium (e.g., memory 240) that can be read by a machine (e.g., portable terminal 200). It may be implemented as software (e.g., a program) that does the following. For example, a processor (e.g., processor 260) of a device (e.g., mobile terminal 200) may call at least one instruction among one or more instructions stored from a storage medium and execute it. there is. This allows the device to be operated to perform at least one function according to the at least one instruction called. The one or more instructions may include code generated by a compiler or code that can be executed by an interpreter. Device-readable storage media may be provided in the form of non-transitory storage media. Here, 'non-transitory' only means that the storage medium is a tangible device and does not contain signals (e.g., electromagnetic waves), and this term refers to data being semi-permanently stored in the storage medium. There is no distinction between temporary storage and temporary storage.

According to an embodiment, methods according to various embodiments disclosed in this document may be provided and included in a computer program product. Computer program products are commodities and can be traded between sellers and buyers. The computer program product may be distributed in the form of a machine-readable storage medium (e.g. compact disc read only memory (CDROM)) or through an application store (e.g. Play Store™) or on two user devices. It can be distributed (e.g., downloaded or uploaded) directly between devices (e.g., smartphones) or online. In the case of online distribution, at least a portion of the computer program product may be at least temporarily stored or temporarily created in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

According to various embodiments, each component (eg, module or program) of the above-described components may include a single entity or a plurality of entities. According to various embodiments, one or more of the components or operations described above may be omitted, or one or more other components or operations may be added. Alternatively or additionally, multiple components (eg, modules or programs) may be integrated into one component. In this case, the integrated component may perform one or more functions of each component of the plurality of components in the same or similar manner as those performed by the corresponding component of the plurality of components prior to the integration. . According to various embodiments, operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, omitted, or , or one or more other operations may be added.

Various flowcharts are disclosed to explain embodiments of the present invention, but these are for convenience of explanation of each step, and each step is not necessarily performed in accordance with the order of the flowchart. That is, each step in the flowchart may be performed simultaneously, in an order according to the flowchart, or in an order opposite to the order in the flowchart.

1 is a diagram illustrating a terminal holder and a portable terminal interoperating with the terminal holder according to an embodiment disclosed in this document.

Referring to Figure 1, a terminal holder 100 and a portable terminal 200 interoperating with the terminal holder are shown.

The terminal holder 100 is a device on which the portable terminal 200 is mounted, and is operated in conjunction with the portable terminal 200, for example, in accordance with a control signal provided from the portable terminal 200 to control the shooting direction of the portable terminal 200 ( Hereinafter referred to as 'front') can be changed.

Hereinafter, it will be described as an example that the terminal holder 100 rotates in the horizontal direction to rotate the photographing direction of the mobile terminal 200, that is, the front side, in the horizontal direction. However, this is for convenience of explanation and is not limited thereto. . For example, the terminal holder 100 may tilt the mounted mobile terminal 200 in the vertical direction, or may perform both horizontal rotation (panning) and vertical rotation (tilting).

The mobile terminal 200 detects a subject in the front image and controls the operation of the terminal holder 100 to keep the front of the mobile terminal 200 facing the subject even when the subject moves.

That is, the mobile terminal 200 detects a subject in the front image being captured, and controls the operation of the terminal holder 100 so that the front of the mobile terminal 200 follows the subject in response to the movement of the subject.

The mobile terminal 200 is an electronic device that can be carried by a user, for example, a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), or a portable multimedia player (PMP). ), navigation, slate PC, tablet PC, ultrabook, wearable device (e.g., smartwatch, smart glass, HMD) (head mounted display) etc. The portable terminal 200 will be described later with reference to FIGS. 3 to 14 .

Figure 2 is a block diagram illustrating a terminal holder according to an embodiment disclosed in this document. With reference to FIGS. 1 and 2 , an embodiment of a terminal holder 100 according to an embodiment of the present invention will be described.

The terminal holder 100 may include a rotating part 110 and a main body 120.

The portable terminal 200 is mounted on the rotating unit 110 and can be rotated by the operation of the motor unit 121. The front of the mobile terminal 200 may change as the rotary unit 110 rotates. Additionally, the rotation direction and rotation speed of the rotation unit 110 may be changed according to the drive control of the motor unit 121.

As an example, the rotating unit 110 may include a fixture, a clamp, and a rotating table. The fixture and fastener may be placed on the rotating table. The fixture and clamp can secure the mobile terminal 200. The user can position the mobile terminal 200 between the fixture and the clamp and tighten the clamp to ensure that the mobile terminal 200 is fixed without shaking. The rotary table can rotate according to the operation of the motor unit 121, and for this purpose, the rotary table can be driven and connected to the motor unit 121.

The main body 120 may include a motor unit 121, a control unit 122, and a communication unit 123. The control unit 122 can control the operation of the terminal holder 100 by controlling the components of the main body 120.

The communication unit 123 may perform a communication connection with the portable terminal 200 and receive a control signal for driving the terminal holder 100 from the portable terminal 200. As an example, the communication unit 123 may establish a communication connection with the portable terminal 200 using at least one of a short-range wireless communication module or wired communication.

The control unit 122 may control the driving of the rotary unit 110 by driving the motor unit 121 in response to a control signal received through the communication unit 123.

Hereinafter, the control signal sent from the mobile terminal 200 to the terminal holder 100 will be described as a control signal for driving the terminal holder 100 - for example, a horizontal rotation motion - but this is for convenience of explanation. It is for this purpose and is not limited to this. That is, depending on the embodiment, the control signal sent from the mobile terminal 200 to the terminal holder 100 not only controls the rotational drive of the rotating part 110 of the terminal holder 100, but also controls the power on of the terminal holder 100. It may include control information for /off, wireless link formation request, authentication, remaining battery level display, etc.

Figure 3 is a block diagram illustrating a portable terminal according to an embodiment disclosed in this document.

Referring to FIG. 3, the portable terminal 200 includes a communication unit 210, a camera unit 220, an output unit 230, a memory 240, a power supply unit 250, and a processor 260. The components shown in FIG. 3 are not essential for implementing a portable terminal, so the portable terminal described in this specification may have more or fewer components than the components listed above.

The communication unit 210 enables communication between the portable terminal 200 and the wireless communication system, between the portable terminal 200 and another portable terminal 200, or between the portable terminal 200 and the terminal holder 100. It may contain one or more modules. This communication unit 210 may include a mobile communication module 211, a wireless Internet module 212, and a short-distance communication module 213. The short-distance communication module 213 can perform a communication connection with the terminal holder 100 by wire or wirelessly. For example, the short-range communication module 213 may include a short-range wireless communication module such as Bluetooth or a wired communication module such as RS232.

The camera unit 220 may include at least one camera. Camera unit 220 may include one or more lenses, image sensors, image signal processors, or flashes.

The camera unit 220 may include a first camera 221 to a second camera 222. The first camera 221 or the second camera 222 may capture a front image of the portable terminal 200.

The output unit 230 is intended to generate output related to vision, hearing, or tactile senses, and may include a display unit 231 and an audio output unit 152. The display unit 231 can implement a touch screen by forming a mutual layer structure or being integrated with the touch sensor. This touch screen can function as a user input unit that provides an input interface between the portable terminal 200 and the user, and at the same time, can provide an output interface between the portable terminal 200 and the user.

The power supply unit 250 receives external power and internal power under the control of the processor 260 and supplies power to each component included in the portable terminal 200. This power supply unit 190 includes a battery, and the battery may be a built-in battery or a replaceable battery.

In addition to operations related to the application program, the processor 260 typically controls the overall operation of the mobile terminal 200. The processor 260 can provide or process appropriate information or functions to the user by processing signals, data, information, etc. input or output through the components discussed above, or by running an application program stored in the memory 240. The processor 260 can be implemented as one processor or multiple processors.

The processor 260 may control at least some of the components examined with FIG. 3 in order to run an application program stored in the memory 240, that is, an application. Furthermore, the processor 260 may operate at least two of the components included in the portable terminal 100 in combination with each other in order to run the application program.

The processor 260 may run an application by executing instructions stored in the memory 240. Hereinafter, the processor 260 is expressed as the subject of control, instruction, or function by driving an application. However, this means that the processor 260 operates by driving instructions or applications stored in the memory 240.

At least some of the above components may cooperate with each other to implement operation, control, or a control method of a portable terminal according to various embodiments described below. Additionally, the operation, control, or control method of the portable terminal may be implemented on the portable terminal by running at least one application program stored in the memory 170.

Hereinafter, various controls of the processor 260 will be described with reference to FIGS. 4 to 14.

FIG. 4 is a flowchart illustrating an example of a terminal holder control method performed in a portable terminal according to an embodiment disclosed in this document, and FIGS. 5 to 7 are examples of the terminal holder control method shown in FIG. 4. These are drawings to explain examples.

Referring to FIG. 4, the processor 260 can control the short-range communication module 213 to establish a communication connection with the terminal holder 100 (S401).

The processor 260 can control the camera unit 220 to obtain a front image of the portable terminal 200 (S401). FIG. 5 shows an example in which a front image of the portable terminal 200 mounted on the terminal holder 100 is acquired under the control of the processor 260. Here, the terminal holder 100 is described as an example of a case in which a horizontal rotation operation is possible so that the front of the portable terminal 200 faces to the right or left relative to the front while holding the portable terminal 200. do.

The processor 260 may detect a subject by performing image analysis on the front image. For example, the processor 260 can set a human body or a human face as a subject to be detected, and can detect whether a human body or a human face exists in the front image. Meanwhile, the subject to be detected can be set in various ways. For example, it may be an animal such as a horse or dog, or a device such as a bicycle.

As an example, the processor 260 may use a pre-trained learning model for the subject to detect the subject in the front image. For example, the processor 260 may use a learning model that is formed based on learning about various images corresponding to the human body and determines the object corresponding to the human body. This learning model can be learned directly by the processor 260, or the processor 260 can use a learning model learned by a separate server.

When the detected subject moves, the processor 260 may generate a control signal to control the operation of the terminal holder 100 so that the front of the portable terminal follows the subject in response to the movement of the subject. Here, tracking means that the shooting direction, that is, the front, of the mobile terminal 200 follows the movement of the subject (tracking), and for this purpose, the processor 260 uses the terminal holder 100 in response to the movement of the subject. ) means controlling the rotational drive of The processor 260 provides the generated control signal to the terminal holder 100 through a communication connection.

As in the example shown in FIG. 6, when a subject is photographed moving to the right relative to the front, the processor 260 detects that the location of the subject is to the right relative to the front, so the terminal holder 100 A control signal can be generated to rotate in the right direction.

The terminal holder 100 can drive the rotating part according to a control signal (S405). Figure 7 shows that as a result of the terminal holder 100 driving the rotating part according to the control signal, the moved subject is again located in the central part of the front image.

When the front image changes according to the driving of the rotating unit, the processor 260 may repeatedly perform the above-described steps S402 to S404 of obtaining the changed front image and detecting and tracking the subject object.

As an embodiment disclosed in this document, an embodiment of tracking, that is, following a subject by the processor 260 will be described with reference to FIGS. 8 to 12.

FIG. 8 is a flowchart illustrating another example of a terminal holder control method performed in a portable terminal according to an embodiment disclosed in this document, and FIGS. 9 to 12 are another example of the terminal holder control method shown in FIG. 8. These are drawings to explain examples.

8 to 12 relate to an embodiment of locating the subject in the center of the front image for tracking the subject.

Referring to FIG. 8, the processor 260 may detect a subject by performing image analysis on the front image (S801). This can be easily understood from the information already explained.

When the detected subject moves, the processor 260 may control the operation of the terminal holder 100 so that the front of the portable terminal follows the subject in response to the movement of the subject.

To this end, the processor 260 may generate a control signal for rotation so that the subject is located in the center of the front image of the portable terminal 200. That is, the processor 260 may determine the direction of rotation of the terminal holder 100 so that the subject's location is in the center of the current front image.

FIG. 9 shows an example of a displayed front image of the portable terminal 200. In the example of FIG. 9, the processor 260 may set a virtual center (CP) for the front image. As an example, this central portion is an area belonging to a certain range based on the center point of the front image, and the central portion can be set in various shapes such as circular, oval, square, or square with rounded corners.

The processor 260 does not control the operation of the terminal holder 100 when the location of the subject detected in the front image is within the central part (CP).

In the example of FIG. 9 , the processor 260 may detect a subject in the front image, and the subject is located within the central portion (CP). Therefore, in this case, the processor 260 does not control the operation of the terminal holder 100 (S802).

Figure 10 shows an example in which the subject moved from the front direction to the right. In the example of FIG. 10, the processor 260 can detect the subject, and since the detected subject is still located within the central part (CP), the processor 260 does not control the operation of the terminal holder 100 (S802 ).

If the location of the subject detected in the front image is not the center (CP), the processor 260 sends a control signal for the rotation of the terminal holder 100 so that the location of the subject reaches the center (CP) of the front image. can be created.

Figure 11 shows an example in which the subject moves further from the front direction to the right. In the example of FIG. 11, the processor 260 can detect the subject, and since the detected subject is still located on the right side of the center CP, the processor 260 drives the terminal holder 100 to rotate to the right. can be controlled.

That is, the processor 260 detects the location of the subject in the front image, and if the detected location of the subject is not the center (CP) of the front image but is on the right or left side with respect to the center (CP), the subject is located in the center (CP). The rotation direction of the terminal holder 100 can be set to the right or left so that it is located at the CP (S803).

12 shows that as the processor 260 provides a driving control signal with the rotation direction set to the right to the terminal holder 100 (S804), the terminal holder 100 rotates and the subject is repositioned within the central portion (CP). It shows that

As an embodiment disclosed in this document, an embodiment of setting the rotation speed of the terminal holder 100 calculated by the processor 260 will be described below with reference to FIGS. 13 and 14.

FIG. 13 is a flowchart illustrating another example of a terminal holder control method performed in a mobile terminal according to an embodiment disclosed in this document, and FIG. 14 is another example of the terminal holder control method shown in FIG. 13. This is a drawing to explain.

Referring to FIG. 13, the processor 260 may detect a subject by performing image analysis on the front image (S1301). This can be easily understood from the information already explained.

The processor 260 may generate a control signal for a rotation operation so that the subject is located in the center of the front image of the portable terminal 200. That is, the processor 260 detects the subject, and if the location of the subject is not in the center of the current front image but on one side (S1302, No), the processor 260 adjusts the rotation direction of the terminal holder 100 to bring the subject to the center. Can be judged (S1303).

Here, the processor 260 may set the rotation speed of the terminal holder 100 based on the distance between the position of the subject in the front image and the center of the front image (S1304).

In the example of FIG. 14 , the processor 260 sets the distance between the location of the subject and the center of the front image based on the distance (d) from the center point of the center to one end of the subject. However, this is an example and can be implemented in various ways, such as setting the distance from one end of the center to one end of the subject, or setting the distance from the center point of the center to the center point of the subject.

As shown in the example, the rotation speed of the terminal holder 100 can be set according to the length of the selected distance d. The longer the distance d is, the farther the subject is from the center, so the rotation speed tends to increase.

As an example, the processor 260 is provided with data (e.g., a look-up table, etc.) about the rotation speed of the terminal holder 100 that is preset according to the range of the distance d between the position of the subject and the center of the front image. You can set the rotation speed using . As another example, the processor 260 may compare a preset reference distance with the distance d between the position of the subject and the center of the front image, and set a reference speed for the reference distance. Accordingly, the ratio of the distance d to the reference distance may be set. The rotation speed can be set by reflecting the standard speed. In addition to this, it is possible to set the rotation speed according to the distance d in various ways.

The processor 260 may reflect the rotation direction and the set rotation speed to generate and provide a control signal for the rotation operation of the terminal holder 100 (S1305).

As an embodiment disclosed in this document, an embodiment of processing by the processor 260 when a subject leaves the front image will be described.

When the subject leaves the screen of the front image in the first direction, the processor 260 may generate a control signal for a rotation motion to rotate in the first direction at a maximum rotation speed.

Detection of the subject by the processor 260 may be performed at regular intervals, or detection may be performed again after processing of the detection process of the subject is completed. Accordingly, the processor 260 can set the departure direction of the subject from the previously detected position of the subject. For example, in the example of FIGS. 10 and 11 , if the subject is not detected in the front image upon re-detection after the subject is recognized, the processor 260 may determine that the subject has deviated to the right.

In such case, the processor 260 may control the terminal holder 100 to rotate to the right at the maximum rotation speed.

If a subject is re-detected in the front image while driving to the right at the maximum rotation speed, the processor 260 may maintain the same rotation direction but change the maximum rotation speed to a preset basic rotation speed. This means that if a subject is re-detected in the front image while driving to the right at the maximum rotation speed, there is a high possibility that the subject is still in the right area of the front image as shown in FIG. 11, so rotation is maintained in the same direction but the maximum rotation speed is maintained. is changed to the basic rotation speed. If a subject is re-detected in the front image and the re-detected subject is present in the center (CP) of the front image, the processor 260 may control the terminal holder 100 to stop rotating and maintain the current direction.

The present invention described above is not limited by the above-described embodiments and the accompanying drawings, but is limited by the scope of the patent claims described below, and the configuration of the present invention can be varied within the scope without departing from the technical spirit of the present invention. Those skilled in the art can easily see that changes and modifications can be made.

100: Terminal stand
110: rotating part 120: body part
121: motor unit 122: control unit
123: Department of Communications
200: mobile terminal
210: Communication unit 220: Camera unit
230: output unit 240: memory
250: power supply unit 260: processor
211: Mobile communication module 212: Wireless Internet module
213: Short-distance communication module
221: first camera 222: second camera
231: display unit 232: sound output unit

Claims (9)

A terminal holder that links with a mobile terminal and provides a tracking function to the mobile terminal, the terminal holder comprising:
a rotating part on which the portable terminal is mounted and which rotates to change the forward direction of the portable terminal; and
A main body unit connected to communication with the portable terminal and rotating the rotating unit based on a control signal provided from the portable terminal,
The rotating part
In response to the movement of the subject, the front of the portable terminal is rotated to follow the subject,
The rotation speed of the rotating part is set to reflect the distance between the position of the subject in the front image of the portable terminal and the preset central portion in the front image.
Terminal stand.
The method of claim 1, wherein the rotating unit,
fixture;
A tightening device that performs a tightening operation through user manipulation to secure the portable terminal together with the fixture; and
The fixture and the clamp are disposed on the upper surface, and are connected to a motor unit included in the main body, comprising a rotating table that rotates in the horizontal direction.
Terminal stand.
delete The method of claim 2, wherein the main body,
A motor unit connected to the rotating table and driving the rotating table to rotate; and
Comprising a control unit that controls the operation of the motor unit based on the control signal provided from the portable terminal,
Terminal stand.
The method of claim 4, wherein the main body,
Further comprising a communication unit that forms a communication connection with the portable terminal using at least one of a short-range wireless communication module or wired communication,
Terminal stand.
delete The method of claim 1, wherein the portable terminal:
Generating the control signal so that the position of the subject in the front image is located in the center,
Terminal stand.
The method of claim 1, wherein the portable terminal:
When the subject leaves the screen of the front image in a first direction, generating the control signal to rotate in the first direction at a maximum rotation speed,
Terminal stand.
The method of claim 8, wherein the portable terminal:
While driving in the first direction at the maximum rotation speed, when the subject is re-detected in the front image, the control signal is generated to maintain the same rotation direction but change the maximum rotation speed to a preset basic rotation speed. ,
Terminal stand.