Patent Publication Number: US-2011058051-A1

Title: Mobile terminal having photographing control function and photographing control system

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims priority from and the benefit under 35 U.S.C. §119(a) of Korean Patent Application No. 10-2009-0084494, filed on Sep. 8, 2009, the disclosure of which is incorporated herein by reference for all purposes. 
     BACKGROUND 
     1. Field 
     The following description relates to a photographing control technique in a mobile terminal. 
     2. Discussion of the Background 
     Conventionally, photographing control commands, such as zoom-in and zoom-out, in a mobile terminal having both front and rear cameras are issued by a user operating buttons or a touch screen. Meanwhile, in the case of a conventional mobile terminal having a video communication function, photographing control commands are issued through the manipulation of the buttons or the touch screen by a user, and the control for a camera of the counterpart is not possible. 
     It is very inconvenient for the user to input the photographing control commands, such as zoom-in and zoom-out, during photographing by physically manipulating the buttons or the touch screen in the mobile terminal equipped with a camera. In addition, when the user manipulates the buttons or the touch screen, this may cause the mobile terminal to move slightly, so that an image may be blurred or out of focus. 
     SUMMARY 
     Exemplary embodiments of the present invention provide a photographing control system employing an image recognition technique that is capable of controlling photographing without a direct physical manipulation from a user by controlling the operation of one camera or the processing of an image taken by the camera when a specific action has been detected from an image taken by another camera. 
     Exemplary embodiments of the present invention provide a photographing control system employing an image recognition technique that detects a specific action from a user image taken by one camera, and controls the operation of another camera or the processing of an image taken by the other camera when the specific action has been detected. 
     Exemplary embodiments of the present invention provide that, in a mobile terminal equipped with both front and rear cameras, or a mobile terminal having a video communication function, an image taken by one camera is analyzed to control the operation of another camera or the processing of an image taken by the other camera, thereby controlling photographing without the physical manipulation of a user. 
     Additional features of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. 
     An exemplary embodiment provides a mobile terminal including an action detecting module to detect a specific action from a first image taken by a first camera of the mobile terminal; a control command creating module to create a first control command to control an operation of a second camera of a counterpart mobile terminal or a processing of an image taken by the second camera of the counterpart mobile terminal if the action detecting module has detected the specific action; a control command transmitting module to transmit the first control command created by the control command creating module to the counterpart mobile terminal; a control command receiving module to receive a second control command from the counterpart mobile terminal to control an operation of the first camera or a processing of an image taken by the first camera; and a photographing control module to control the operation of the first camera or the processing of the image taken by the first camera according to the second control command received in the control command receiving module. 
     An exemplary embodiment provides a mobile terminal including an image transmitting module to transmit a first image taken by a first camera of the mobile terminal to a counterpart mobile terminal; an image receiving module to receive a second image from the counterpart mobile terminal; an action detecting module to detect a specific action from the second image received from the counterpart mobile terminal in the image receiving module; and a photographing control module to control an operation of the first camera or a processing of an image taken by the first camera of the mobile terminal if the action detecting module detects the specific action. 
     An exemplary embodiment provides a mobile terminal including an action detecting module to detect a specific action from a first image taken by a first camera; and a photographing control module to control an operation of a second camera or a processing of a second image taken by the second camera if the action detecting detects the specific action. 
     An exemplary embodiment provides a photographing control system including a first mobile terminal including a first camera, an action detecting module to detect a specific action from a first image taken by the first camera, a control command creating module to create a control command to control an operation of a second camera or a processing of a second image taken by the second camera if the action detecting module detects the specific action, and a control command transmitting module to transmit the control command created by the control command creating module; and a second mobile terminal including the second camera, a control command receiving module to receive the control command from the first mobile terminal to control the operation of the second camera or the processing of the second image taken by the second camera, and a photographing control module to control the operation of the second camera or the processing of the second image taken by the second camera according to the control command received by the control command receiving module. 
     An exemplary embodiment provides a photographing control system including: a first mobile terminal including a first camera, and an image transmitting module to transmit a first image taken by the first camera; and a second mobile terminal including a second camera, an image receiving module to receive the first image from the first mobile terminal, an action detecting module to detect a specific action from the first image received by the image receiving module, and a photographing control module to control an operation of the second camera and a processing of a second image taken by the second camera if the action detecting module detects the specific action. 
     An exemplary embodiment provides a mobile terminal including: a first camera and a second camera; an action detecting module to detect a specific action from an image taken by the first camera; a photographing control module to control an operation of the second camera or a processing of an image taken by the second camera if the action detecting module detects the specific action. 
     An exemplary embodiment provides a mobile terminal including: an action detecting module to detect a specific action from a first image taken by a first camera of the mobile terminal; a control command creating module to create a first control command to control an operation of a second camera or a processing of an image taken by the second camera if the action detecting module has detected the specific action; and a control command transmitting module to transmit the first control command created by the control command creating module. 
     An exemplary embodiment provides a mobile terminal including: a control command receiving module to receive a control command to control an operation of a camera of the mobile terminal or a processing of an image taken by the camera of the mobile terminal; and a photographing control module to control the operation of the camera of the mobile terminal or the processing of the image taken by the camera of the mobile terminal according to the control command received in the control command receiving module. 
     An exemplary embodiment provides a mobile terminal including: an image receiving module to receive a an image; an action detecting module to detect a specific action from the image received in the image receiving module; and a photographing control module to control an operation of a camera of the mobile terminal or a processing of an image taken by the camera of the mobile terminal if the action detecting module detects the specific action. 
     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. Other features and aspects will be apparent from the following detailed description, the drawings, and the claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the principles of the invention. 
         FIG. 1  is a block diagram showing a mobile terminal having a photographing control function based on an image recognition technique according to an exemplary embodiment of the present invention. 
         FIG. 2  is a block diagram showing a photographing control system employing an image recognition technique according to an exemplary embodiment of the present invention. 
         FIG. 3  is a block diagram showing a mobile terminal having a photographing control function based on an image recognition technique according to an exemplary embodiment of the present invention. 
         FIG. 4  is a block diagram showing a photographing control system employing an image recognition technique according to an exemplary embodiment of the present invention. 
         FIG. 5  is a block diagram showing a mobile terminal having a photographing control function based on an image recognition technique according to an exemplary embodiment of the present invention. 
         FIG. 6  is a flowchart showing the photographing procedure of the photographing control system employing an image recognition technique according to an exemplary embodiment of the present invention. 
     
    
    
     Elements, features, and structures are denoted by the same reference numerals throughout the drawings and the detailed description, and the size and proportions of some elements may be exaggerated in the drawings for clarity and convenience. 
     DETAILED DESCRIPTION 
     The invention is described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure is thorough, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. Like reference numerals in the drawings denote like elements. 
       FIG. 1  is a block diagram showing a user&#39;s mobile terminal  100  and a counterpart mobile terminal  105  having a photographing control function based on an image recognition technique according to an exemplary embodiment of the present invention. The user&#39;s mobile terminal  100  having a photographing control function includes an action detecting module  110   a , a control command creating module  120   a , a control command transmitting module  130   a , a control command receiving module  140   a , and a photographing control module  150   a . The user&#39;s mobile terminal  100  having the photographing control function based on the image recognition technique may further include an action setting module  160   a  and a setting module  170   a . The counterpart mobile terminal  105  includes an action detecting module  110   b , a control command creating module  120   b , a control command transmitting module  130   b , a control command receiving module  140   b , a photographing control module  150   b , an action setting module  160   b , and a setting module  170   b.    
     The action detecting module  110   a  detects a specific action of a user from a user image taken by a first camera  200  of the user&#39;s mobile terminal  100 . Although described a being taken, the user image may be but need not be recorded or stored in a memory of the user&#39;s mobile terminal  100 . The specific action of the user can be detected by analyzing the variation in features of the user image to recognize a variation in motion and/or a facial expression of the user according to an image recognition technique. The analysis of the user image according to the image recognition technique may include analysis of two or more images so as to detect variation between the two images. The specific action may be detected by analyzing variations of feature points included in the images of the user to thus recognize variations in motion or expression. Thus, the user may perform the specific action detected by the analysis of the user image according to the image recognition technique so as to control the photographing control function of the user&#39;s mobile terminal  100 . 
     For example, the action detecting module  110   a  of the mobile terminal  100  may detect the specific action of the user from the user image by recognizing the motion and/or the variation in facial expression of the user, such as approach or retreat of the user with respect to the camera, a leftward or rightward movement of the user, a blink of the user&#39;s right eye or left eye, a shape of the user&#39;s mouth, an angle of the user&#39;s face, a turn of the user&#39;s face to the left or right, or a frown of the user&#39;s face. 
     If the action detecting module  110   a  of the mobile terminal  100  has detected the specific action of the user, the control command creating module  120   a  of the mobile terminal  100  creates a control command to control the operation of a second camera  300  of the counterpart mobile terminal  105  of or for processing of an image taken by the second camera  300  of the counterpart mobile terminal  105 . 
     The control command transmitting module  130   a  transmits the control command created by the control command creating module  120   a  to the control command receiving terminal  140   b  of the counterpart mobile terminal  105 . The control command transmitted from the control command transmitting module  130   a  of the mobile terminal  100  is received in the counterpart mobile terminal  105  via a mobile communication network to control the operation of the second camera  300  of the counterpart mobile terminal or the processing of the image taken by the second camera  300  of the counterpart mobile terminal  105 . 
     The counterpart mobile terminal  105  that has received the control command controls the operation of the second camera  300  or the processing of the image taken by the second camera  300 . Details thereof will be described later with reference to  FIG. 2 . 
     The control command receiving module  140   a  of the user&#39;s mobile terminal  100  receives a control command from the control command transmitting module  130   b  of the counterpart mobile terminal  105  to control the operation of the first camera  200  or the processing of an image taken by the first camera  200 . 
     The photographing control module  150   a  of the mobile terminal  100  controls the operation of the first camera  200  of the user&#39;s mobile terminal  100  or the processing of an image taken by the first camera  200  according to the control command received by the control command receiving module  140   a  of the mobile terminal  100 . 
     For example, the photographing control module  150   a  may control a zoom-in operation or a zoom-out operation of the first camera  200 , a viewing angle of the first camera  200 , a photographing starting operation or video recording starting operation of the first camera  200 , or a photographing terminating operation or video recording terminating operation of the first camera  200 , thereby controlling the operation of the first camera  200  according to a specific action detected by the counterpart mobile terminal  105 . 
     The photographing control module  150   a  controls a display of the image, a transfer of the image, a synthesis of the image, a processing of a special effect of the image, or a displacing of the user image taken by the first camera  200 , so that the processing of the user image taken by the first camera  120  can be controlled according to the specific action of the counterpart mobile terminal  105 . 
     As shown in  FIG. 1 , the mobile terminal  100  having the photographing control function based on the image recognition technique may further include an action setting module  160   a . The action setting module  160   a  sets specific actions detected by the action detecting module  110   a . In other words, the action setting module  160   a  acquires from the user information about the operation of the second camera  300  or the processing operation of an image taken by the second camera  300  of the counterpart mobile terminal  105  that are performed after a specific action has been detected and stores the operation information as action setting information in the action setting module  160   a . The action detecting module  110   a  refers to the action setting information of the action setting module  160   a  if the specific action is detected. 
     Further, the mobile terminal  100  having the photographing control function based on the image recognition technique may further include a setting module  170   a . The setting module  170   a  sets an on/off state of the operation of the photographing control module  150   a . In other words, the setting module  170   a  stores information regarding an on/off state as setting information. The operation of the photographing control module  150   a  may be controlled according to the setting information. 
     The mobile terminal  100  having the photographing control function based on the image recognition technique analyzes a user image taken by one camera through the image recognition technique to detect the specific action of the user. If the specific action of the user has been detected, the operation of another camera or the processing of an image taken by another camera is controlled, thereby controlling photographing without the physical manipulation of the buttons or the touch screen by the user. 
       FIG. 2  is a block diagram showing a photographing control system employing the image recognition technique according to the exemplary embodiment described above. In the photographing control system employing the image recognition technique, the first camera  200  is installed in the mobile terminal  100  of a first user, and the second camera  300  is installed in the counterpart mobile terminal  105  of a second user such that the counterpart mobile terminal  105  of the second user controls the operation of the second camera  300  or the processing of the image taken by the second camera  300  according to a control command that has been transmitted from the mobile terminal  100  of the first user if the specific action has been detected from the user image taken by the first camera  200 . 
     The action detecting module  110   a  of the mobile terminal  100  of the first user detects a specific action from a user image taken by the first camera  200 . 
     The control command creating module  120   a  of the mobile terminal  100  of the first user creates a control command to control the operation of the second camera  300  or the processing of an image taken by the second camera  300  if the specific action has been detected by the action detecting module  110 . 
     The control command transmitting module  130   a  of the mobile terminal  100  of the first user transmits the control command created by the control command creating module  120   a . The control command is transmitted from the control command transmitting module  130   a  to the counterpart mobile terminal  105  of the second user via a mobile communication network so that the control command is used to control the operation of the second camera  300  or the processing of the image taken by the second camera  300 . 
     The control command receiving module  140   b  of the counterpart mobile terminal  105  of the second user receives the control command from the mobile terminal  100  of the first user to control the operation of the second camera  300  or the processing of the image taken by the second camera  300 . 
     The photographing control module  150   b  of the counterpart mobile terminal  105  of the second user controls the operation of the second camera  300  or the processing of the image taken by the second camera  300  according to the control command received in the control command receiving module  140   b.    
     For example, the photographing control module  150   b  can control a zoom-in operation or a zoom-out operation of the second camera  300 , a photographic angle of the second camera  300 , a photographing starting operation or video starting operation of the second camera  300 , or a photographing terminating operation or video terminating operation of the second camera  300 . Therefore, the operation of the second camera  300  can be controlled according to a specific action of a user. 
     For example, the photographing control module  150   b  can control a display of the image, a transfer of the image, a synthesis of the image, a processing of a special effect of the image, or a displacing of the image taken by the second camera  300 . Therefore, the processing of the image taken by the second camera  300  can be controlled depending on the specific action of the user. 
     Accordingly, the photographing control system employing the image recognition technique analyzes a user image taken by one camera through the image recognition technique to detect the specific action of the user. If the specific action of the user has been detected, the operation of another camera or the processing of an image taken by another camera is controlled, thereby controlling photographing without the manipulation of buttons or a touch screen by the user. 
       FIG. 3  is a block diagram showing a mobile terminal  400  having a photographing control function based on an image recognition technique according to an exemplary embodiment of the present invention. The mobile terminal  400  having a photographing control function based on the image recognition technique includes an image transmitting module  410   a , an image receiving module  420   a , an action detecting module  430   a , a photographing control module  440   a , an action setting module  450   a , and a setting module  460   a . A counterpart mobile terminal  405  includes an image transmitting module  410   b , an image receiving module  420   b , an action detecting module  430   b , a photographing control module  440   b , an action setting module  450   b , and a setting module  460   b.    
     The image transmitting module  410   a  transmits a user image taken by a first camera  500  to a counterpart mobile terminal  405 . The user image is transmitted from the image transmitting module  410   a  to the counterpart mobile terminal  405  via a mobile communication network. 
     The counterpart mobile terminal  405  that has received the user image detects a specific action from the user image taken by the first camera  500  of the mobile terminal  400  to control the operation of a second camera  600  or the processing of an image taken by the second camera  600 . Details thereof will be described below with reference to  FIG. 4 . 
     The image receiving module  420   b  of the counterpart mobile terminal  405  receives a user image received from the mobile terminal  400 . After the user image taken by the first camera  500  of the mobile terminal  400  has been transmitted from the counterpart mobile terminal  405 , the image receiving module  420   b  of the counterpart mobile terminal  405  receives the user image. 
     The action detecting module  430   b  of the counterpart mobile terminal  405  detects a specific action from the user image received by the image receiving module  420   b . The specific action can be detected by analyzing the variation in features of the user image to recognize the variation in the motion and/or the facial expression of the user based on the image recognition technique. 
     For example, the action detecting module  430   b  of the counterpart mobile terminal  405  may detect the specific action of the user from the user image by recognizing the motion and/or the variation in the facial expression of the user, such as approach or retreat of the user with respect to the camera, a leftward or rightward movement of the user, a blink of the user&#39;s right eye or left eye, a shape of the user&#39;s mouth, an inclination of the user&#39;s face, a turn of the user&#39;s face to the left or right, or a frown of the user&#39;s face. 
     If the action detecting module  430   b  of the counterpart mobile terminal  405  has detected the specific action, the photographing control module  440   b  controls the operation of the second camera  600  or the processing of an image taken by the second camera  600 . 
     For example, the photographing control module  440   b  of the counterpart mobile terminal  405  can control the zoom-in operation or the zoom-out operation of the second camera  600 , the photographic angle of the second camera  600 , the starting operation of the photographing, the video recording starting operation, the video recording terminating operation, or the terminating operation of the photographing, thereby controlling the operation of the second camera  600  according to the specific action of the user. 
     In addition, the photographing control module  440   b  of the counterpart mobile terminal  405  can control a display of the image, a transfer of the image, a synthesis of the image, a processing of a special effect of the image, or the displacing of an image taken by the second camera  600 , thereby controlling the processing of an image taken by the second camera  600  according to the specific action of the user. 
     The mobile terminal  405  having the photographing control function based on the image recognition technique may further include an action setting module  450   b . The action setting module  450   a  sets specific actions detected by the action detecting module  430   b . In other words, the action setting module  450   b  acquires from the user information about the operation of the second camera  600  or the processing operation of an image taken by the second camera  600  of the counterpart mobile terminal  405  that are performed after a specific action has been detected and stores the operation information as action setting information in the action setting module  450   b . The action detecting module  430   b  refers to the action setting information of the action setting module  450   b  when the specific action is detected. 
     Further, the mobile terminal  405  having the photographing control function based on the image recognition technique may further include a setting module  460   b . The setting module  460   b  sets an on/off state of the operation of the photographing control module  440   b . In other words, the setting module  460   b  stores information regarding an on/off state as setting information. The operation of the photographing control module  440   b  may be controlled according to the setting information. 
     The mobile terminal having the photographing control function based on the image recognition technique analyzes a user image taken by one camera through the image recognition technique to detect the specific action of the user. If the specific action of the user has been detected, the operation of another camera or the processing of an image taken by another camera is controlled, thereby controlling photographing without the manipulation of buttons or a touch screen by the user. 
       FIG. 4  is a block diagram showing a photographing control system employing the image recognition technique. In the photographing control system employing the image recognition technique, the first camera  500  is installed in the mobile terminal  400  of a first user, and the second camera  600  is installed in the counterpart mobile terminal  405  of a second user such that the mobile terminal  400  of the first user transmits a user image taken by the first camera  500 , and the counterpart mobile terminal  405  of the second user which has received the user image controls the operation of the second camera  600  or the processing of the user image taken by the second camera  600  if the specific action has been detected from the user image. 
     The image transmitting module  410   a  of the mobile terminal  400  of the first user transmits the user image taken by the first camera  500 . The user image is transmitted from the image transmitting module  410   a  of the mobile terminal  400  of the first user to the counterpart mobile terminal  405  of the second user via a mobile communication network. 
     The image receiving module  420   b  of the counterpart mobile terminal  405  of the second user receives the user image from the mobile terminal  400  of the first user. The action detecting module  430   b  of the counterpart mobile terminal  405  of the second user detects a specific action from the user image received in the image receiving module  420   b  thereof. 
     The photographing control module  440   b  of the counterpart mobile terminal  405  of the second user controls the operation of the second camera  600  or the processing of an image taken by the second camera  600  if the action detecting module  430   b  has detected the specific action. 
     For example, the photographing control module  440   b  can control a zoom-in operation or a zoom-out operation of the second camera  600 , a photographic angle of the second camera  600 , a starting operation of the photographing, a video starting operation, a video terminating operation, or a terminating of the photographing, thereby controlling the operation of the second camera  600  according to the specific action of the user. 
     For example, the photographing control module  440   b  can control a display of the image, a transfer of the image, a synthesis of the image, a processing of a special effect of the image, or a displacing of the image taken by the second camera  600 , so that the processing of the image taken by the second camera  600  can be controlled according to the specific action of the user. 
     The photographing control system employing the image recognition technique analyzes a user image taken by one camera to detect the specific action of the user. When the specific action of the user has been detected, the operation of another camera or the processing of an image taken by another camera is controlled, thereby controlling photographing without the manipulation of buttons or a touch screen by the user. 
       FIG. 5  is a block diagram showing a mobile terminal  700  having a photographing control function based on an image recognition technique according to an exemplary embodiment of the present invention. The mobile terminal  700  having the photographing control function based on the image recognition technique is equipped with first and second cameras  800  and  900 . The first and second cameras  800  and  900  may be dispose on opposite sides of the mobile terminal  700 . The mobile terminal  700  includes an action detecting module  710  and a photographing control module  720 . The action detecting module  710  detects a specific action from a user image taken by the first camera  800 , and the photographing control module  720  controls the operation of the second camera  900  or the processing of an image taken by the second camera  900  when the specific action has been detected. 
     The action detecting module  710  detects a specific action from the user image taken by the first camera  800 . The specific action of the user can be detected by analyzing a variation in features of the user image to recognize the variation in a motion and/or a facial expression of the user based on the image recognition technique. 
     For example, the action detecting module  710  may detect the specific action of the user from the user image by recognizing the motion and/or the variation in the facial expression of the user, such as approach or retreat of the user with respect to the camera, a leftward or a rightward movement of the user, a blink of the user&#39;s right eye or left eye, a shape of the user&#39;s mouth, an inclination of the user&#39;s face, a turn of the user&#39;s face to the left or right, or a frown of the user&#39;s face. 
     The photographing control module  720  controls the operation of the second camera  900  or the processing of an image taken by the second camera  900  when the action detecting module  710  has detected the specific action. 
     For example, the photographing control module  720  can control a zoom-in operation or a zoom-out operation of the second camera  900 , a photographic angle of the second camera  900 , a starting operation of the photographing, a video recording starting operation, a video recording terminating operation, or a terminating of the photographing, thereby controlling the operation of the second camera  900  according to the detected specific action of the user. 
     In addition, the photographing control module  720  can control a display of the image, a transfer of the image, a synthesis of the image, a processing of a special effect of the image, or a displacing of the image taken by the second camera  900 , thereby controlling the processing of the image taken by the second camera  900  according to the detected specific action of the user. 
     Therefore, the mobile terminal having the photographing control function based on the image recognition technique analyzes a user image taken by one camera through the image recognition technique to detect the specific action of the user. When the specific action of the user is detected, the operation of another camera or the processing of an image taken by another camera is controlled, thereby controlling photographing without the manipulation of buttons or a touch screen by a user. 
     As shown in  FIG. 5 , the mobile terminal  700  having the photographing control function based on the image recognition technique may further include an action setting module  730 . The action setting module  730  sets specific actions detected by the action detecting modules  110 ,  430 , and  710 . In other words, the action setting module  730  acquires from the user information about the operation of the second camera  900  or the processing operation of an image taken by the second camera  900  that are performed after a specific action has been detected and stores the operation information as action setting information in the action setting module  730 . The action detecting module  710  refers to the action setting information of the action setting module  730  when the specific action is detected. 
     As shown  FIG. 5 , the mobile terminal  700  having the photographing control function based on the image recognition technique may further include setting module  740 . The setting module  740  sets an on/off state of the operation of the photographing control module  720 . 
     In other words, the setting module  740  stores information regarding an on/off state as setting information. The operation of the photographing control module  720  may be controlled according to the setting information. 
     Hereinafter, a photographing control operation of the photographing control system having the above structure and employing the image recognition technique will be described with reference to  FIG. 6 .  FIG. 6  is a flowchart showing the photographing controlling procedure of the photographing control system employing the image recognition technique. 
     If a user image is taken by a first camera, the photographing control system employing the image recognition technique detects a specific action from the user image taken by the first camera in operation S 110 . 
     The photographing control system can detect the specific action of the user by detecting, based on the user image, that the user approaches the first camera or moves away from the first camera. The photographing control system detects whether the user approaches or moves away from the first camera by recognizing a variation in the size of features of the user image taken by the first camera. 
     The photographing control system can detect the specific action of the user by detecting, based on the user image, that the user moves leftward or rightward. In this case, the photographing control system detects that the user moves leftward or rightward by recognizing a displacement of the features, the rotation of the features, or the inclination of the features of the user image taken by the first camera. 
     The photographing control system can detect the specific action of the user by detecting, based on the user image, that a user&#39;s right eye or left eye blinks. In this case, the photographing control system detects that the user&#39;s right eye or left eye blinks by recognizing a variation in the features of the user image, which is taken by the first camera, related to the user&#39;s right eye or left eye. 
     The photographing control system can detect the specific action of the user by detecting a shape of a user&#39;s mouth from the user image. In this case, the mouth shape of the user can be detected by recognizing a variation in features related to a mouth of the user image taken by the first camera. 
     The photographing control system can detect the specific action of the user by detecting, based on the user image, the inclination of a user&#39;s face. In this case, the inclination of the user&#39;s face can be detected by recognizing the displacement of the features, the rotation of the features, or the inclination of the features of the user image taken by the first camera. 
     The photographing control system can detect the specific action of the user by detecting, based on the user image, a turn of the user&#39;s face to the left or the right. In this case, the photographing control system detects the turn of the user&#39;s face to the left or the right by recognizing the displacement of features, the rotation of the features, or the inclination of the features of the user image taken by the first camera. 
     In addition, the photographing control system can detect the specific action of the user by detecting, based on the user image, a frown of the user&#39;s face. In this case, the frown of the user&#39;s face can be detected by recognizing a variation in features related to the eyes, nose, and mouth of the user of the user image taken by the first camera. 
     If the specific action has been detected in operation S 110 , the photographing control system employing the image recognition technique controls the operation of the second camera or the processing of an image taken by the second camera in operation S 120 . The photographing control system repeatedly performs the photographing control operation until a command to terminate the photographing control operation is received in operation S 130 . 
     For example, the photographing control system can control a zoom-in operation or a zoom-out operation of the second camera, a photographic angle of the second camera, a starting operation of the photographing, a video recording starting operation, a video recording terminating operation, or a terminating of the photographing in operation S 120 , thereby controlling the operation of the second camera according to the detected specific action from the user image taken by the first camera. 
     The photographing control system can control a display of the image, a transfer of the image, a synthesis of the image, a processing of a special effect of the image, or a displacing of the image taken by the second camera in operation S 120 , so that the processing of the image taken by the second camera can be controlled according to the specific action from the user image taken by the first camera. 
     In a mobile terminal having both front and rear cameras or a mobile terminal having a video communication function, an image taken by one camera is analyzed, thereby controlling the operation of the other camera or the processing of an image taken by the other camera. Accordingly, photographing can be controlled without the manipulation of buttons or a touch screen by the user. 
     Hereinafter, examples of applying the photographing control system employing the image recognition technique to mobile terminals will be described. 
     For example, the photographing control system employing the image recognition technique may detect from a user image taken by the first camera that a user approaches the first camera such that a second camera performs a zoom-in operation, or may detect that the user moves back from the first camera such that the second camera performs a zoom-out operation. In other words, the photographing control system may control the zoom-in operation or the zoom-out operation of the second camera through the detection of the approaching the first camera or moving away from the first camera of the user without the manipulation of buttons or a touch screen by the user. 
     In addition, the photographing control system employing the image recognition technique may detect the leftward movement of a user from a user image taken by the first camera to rotate the photographic angle of the second camera leftward, or may detect the rightward movement of the user from the user image to rotate the photographic angle of the second camera rightward. In other words, the photographing control system may control the photographic angle through the detection of the rightward or leftward movement of the user without the manipulation of buttons or a touch screen by the user. 
     For example, the photographing control system employing the image recognition technique may detect the blink of a user&#39;s left eye from a user image taken by the first camera to start the photographing operation of the second camera or video recording of the second camera, or may detect the blink of a user&#39;s right eye to terminate the photographing operation of the second camera or video recording of the second camera. In other words, the photographing control system may control the starting or the terminating of the photographing operation or video recording of the second camera of the second camera through the detection of the blink of the user&#39;s left eye or right eye without the manipulation of buttons or a touch screen by the user. 
     For example, the photographing control system employing the image recognition technique may detect an open state of the user&#39;s mouth from a user image taken by the first camera to start the display of an image taken by the second camera, or may detect a protrusion state of the user&#39;s mouth to terminate the display of the image of the second camera. In other words, the photographing control system may control the display of the image of the second camera through the detection of the shape of the user&#39;s mouth without the manipulation of buttons or a touch screen by the user. 
     For example, the photographing control system employing the image recognition technique may detect forward inclination of the user&#39;s face towards the camera from a user image taken by the first camera to zoom in the second camera, or may detect backward inclination of the user&#39;s face away from the camera to zoom out the second camera. In other words, the photographing control system may control the zoom-in or zoom-out operation of the second camera through the detection of the angle of the user&#39;s face without the manipulation of buttons or a touch screen by the user. 
     For example, the photographing control system employing the image recognition technique may detect the turn of the user&#39;s face to the left from a user image taken by the first camera to symmetrically divide both images taken by the first and second cameras, synthesize the divided images, and then display the synthesized image. The photographing control system may detect the turn of the user&#39;s face to the right from the user image to insert the image of the first camera into the image of the second camera through Picture in Picture (PIP) and display the synthesized image. In other words, the photographing control system may control synthesis of images through the detection of the turning of the user&#39;s face without the manipulation of buttons or a touch screen by the user. 
     For example, the photographing control system employing the image recognition technique may detect the frown of the user&#39;s face from a user image taken by the first camera to transfer an image taken by the second camera to a mobile terminal of another user. In other words, the photographing control system may control the transfer of the image taken by the second camera through the detection of the frown of the user&#39;s face without the manipulation of buttons or a touch screen by the user. 
     The photographing control modules  150 ,  440 , and  720  may control the operation of the second camera or the processing of an image taken by the second camera by reflecting the speed or frequency with which the user moves towards or back from the first camera, the speed or the frequency with which the user&#39;s left eye or right eye blinks, the degree to which the user&#39;s mouth is open, the inclination degree of the user&#39;s face, the speed or the frequency in the turn of the user&#39;s face to the left or the right, or the degree to which the user frowns. 
     For example, according to the speed at which the user moves toward or away from the first camera, the photographing control modules  150 ,  440 , and  720  can variably control the zoom-in or zoom-out speed of the second camera. 
     For example, if the photographing control system detects that a user&#39;s face is inclined once, the photographing control modules  150 ,  440 , and  720  may transfer the image taken by the second camera to the counterpart mobile terminal  105 . If the photographing control system detects that the user&#39;s face is inclined twice, the photographing control modules  150 ,  440 , and  720  may synthesize images taken by the first and second cameras and then transfer the synthesized image to the counterpart mobile terminal  105 . 
     It will be apparent to those skilled in the art that various modifications and variation can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.