Abstract:
Embodiments of the present invention provide an operating method and apparatus for a detachable lens type camera system which is suitable for photographing a picture or a video having high definition. According to an embodiment of the present invention, a camera system comprises: a body; and a lens part which can be detachably mounted to the body and can be wirelessly connected to the body. The lens part estimates location information between the lens part and the body using beam information of the lens part and beam information of the body, which are formed by beam-forming, and applies the estimated location information to photographing.

Description:
TECHNICAL FIELD OF THE INVENTION 
       [0001]    The present disclosure relates to an interchangeable-lens camera. 
       BACKGROUND OF THE INVENTION 
       [0002]    With the recent development of communication technologies, an interchangeable-lens camera (or a camera with an interchangeable lens) has been released. The interchangeable-lens camera supports a wireless connection function so that the photographing of a picture or video image is enabled even when a main body and a lens unit are physically separated from each other. The main body and the lens unit are provided with a wireless module therein for a wireless connection therebetween. In such an interchangeable-lens camera, photographing shall be enabled in the state where the main body and the lens unit are separated from each other. 
       DISCLOSURE OF INVENTION 
     Technical Problem of the Invention 
       [0003]    Accordingly, embodiments of the present disclosure are to provide an operating method and apparatus for an interchangeable-lens camera system, which are suitable for photographing a high-definition picture or video image. 
         [0004]    Other embodiments of the present disclosure are to provide an operating method and apparatus for an interchangeable-lens camera system, which are suitable for photographing while in a state where a camera body and a lens unit are separated from each other. 
         [0005]    In a case where a picture or video image is photographed by an interchangeable-lens camera system in a state where a camera body and a lens unit are separated from each other, still other embodiments of the present disclosure are to provide a method and apparatus for measuring a moving trace of the camera body and/or the lens unit and converting photographed image data by using a measured result. 
         [0006]    Still other embodiments of the present disclosure are to provide a composition control method and apparatus that are suitable in a case where a picture or video image is photographed by an interchangeable-lens camera system while in a state where a camera body and a lens unit are separated from each other. 
         [0007]    Yet other embodiments of the present disclosure are to provide a zoom-in/out processing method and apparatus that are suitable in a case where a picture or video image is photographed by an interchangeable-lens camera system while in a state where a camera body and a lens unit are separated from each other. 
       Solution to Problem of the Invention 
       [0008]    According to one embodiment of the present disclosure, there is provided a method of operating a lens unit in a camera system that includes a main body and a lens unit configured to be detachably mounted on the main body and wirelessly connected to the main body. The lens unit operating method includes: acquiring a moving trace of at least one of the lens unit and the main body; and converting photographed image data based on the acquired moving trace. 
         [0009]    According to another embodiment of the present disclosure, there is provided a lens unit in a camera system that includes a main body and a lens unit configured to be detachably mounted on the main body and wirelessly connected to the main body. The lens unit includes: a moving trace acquisition device configured to acquire a moving trace of at least one of the lens unit and the main body; and a controller configured to convert photographed image data based on the acquired moving trace. 
         [0010]    According to still another embodiment of the present disclosure, there is provided a main body operating method in a camera system that includes a main body and a lens unit configured to be detachably mounted on the main body and wirelessly connected to the main body. The main body operating method includes: acquiring a moving trace of the main body; and transmitting information for the acquired moving trace to the lens unit so as to cause a photographed image data conversion operation to be performed based on the moving trace information by the lens unit. 
         [0011]    According to still another embodiment of the present disclosure, there is provided a main body in a camera system that includes a main body and a lens unit configured to be detachably mounted on the main body and wirelessly connected to the main body. The main body includes: a moving trace acquisition device configured to acquire a moving trace of the main body; and a wireless module configured to transmit information for the acquired moving trace to the lens unit so as to cause a photographed image data conversion operation to be performed based on the moving trace information by the lens unit. 
       Advantageous Effects 
       [0012]    According to the embodiments of the present disclosure, a photographing composition of a picture or video image can be efficiently changed by using the main body when photographing the picture or video image even if the wireless lens unit and the main body are separated from each other. In addition, zoom-in/out can be easily implemented by moving the main body forward/backward. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0013]    In order to give a more complete understanding of the present disclosure and the effects thereof, the following description will be made with reference to the accompanying drawings in which similar components will be denoted by similar reference numerals. 
           [0014]      FIG. 1  is a view illustrating a connection configuration of an interchangeable-lens camera system to which the present disclosure is applied; 
           [0015]      FIG. 2A  is a view illustrating a configuration of a wireless lens unit and a main body that constitute an interchangeable-lens camera system according to one embodiment of the present disclosure; 
           [0016]      FIG. 2B  is a view illustrating a configuration of a wireless lens unit and a main body that constitute an interchangeable-lens camera system according to another embodiment of the present disclosure; 
           [0017]      FIG. 3  is a view illustrating an operation of an interchangeable-lens camera system according to embodiments of the present disclosure; 
           [0018]      FIG. 4A  is a view illustrating an operation of an interchangeable-lens camera system according to one embodiment of the present disclosure; 
           [0019]      FIG. 4B  is a view illustrating an operation of an interchangeable-lens camera system according to another embodiment of the present disclosure; 
           [0020]      FIGS. 5A and 5B  are views illustrating configuration examples of a wireless lens unit of an interchangeable-lens camera system for an operation of one embodiment of the present embodiment; 
           [0021]      FIG. 6  is a view illustrating a configuration example of a wireless lens unit of an interchangeable-lens camera system for an operation of another embodiment of the present embodiment; 
           [0022]      FIG. 7  is a view for describing a rotation measurement operation by a wireless lens unit for an image data rotating operation according to one embodiment of the present disclosure; 
           [0023]      FIG. 8  is a view for describing rotation measurement and acceleration measurement operations by a main body for image data rotating and zoom processing operations according to embodiments of the present disclosure; 
           [0024]      FIG. 9  is a view for describing a method of mechanically rotating an image sensor of a wireless lens unit for an image data rotating operation according to one embodiment of the present disclosure; 
           [0025]      FIG. 10  is a view illustrating a processing flow by a wireless lens unit for an image data rotating operation according to one embodiment of the present disclosure; 
           [0026]      FIG. 11  is a view illustrating a processing flow by a main body for an image data rotating operation according to one embodiment of the present disclosure; 
           [0027]      FIG. 12  is a view for describing a mutual operation of a wireless lens unit and a main body for an image data zoom processing operation according to another embodiment of the present disclosure; 
           [0028]      FIG. 13  is a view illustrating a processing flow by a wireless lens unit for an image data zoom processing operation according to one embodiment of the present disclosure; and 
           [0029]      FIG. 14  is a view illustrating a processing flow by a main body for an image data zoom processing operation according to one embodiment of the present disclosure. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0030]      FIGS. 1 to 14  to be used herein for describing principles of the present disclosure are only illustrative and shall not be interpreted as limiting the scope of the present disclosure in any way. A person ordinarily skilled in the art may understand that the principles of the present disclosure may also be implemented in any wireless communication system by being properly arranged therein. 
         [0031]    The embodiments of the present disclosure to be described below are related to an interchangeable-lens camera in which a wireless lens unit and a main body are separable from each other. As illustrated in  FIG. 1 , an interchangeable-lens camera includes a wireless lens unit  100  and a main body  200 . The wireless lens unit  100  and the main body  200  may be connected to each other through wireless modules provided therein so as to transmit a control signal and data therebetween. Thus, the wireless lens unit  100  and the main body  200  enable the photographing of a picture or video image, not only in a state where the wireless lens unit  100  and the main body  200  are coupled to each other through mounts  10  and  20  thereof ( FIG. 1( a ) ), but also in a state where the wireless lens unit  100  and the main body  200  are separated from each other ( FIG. 1( b ) ). In another embodiment, the wireless lens unit  100  may be paired with a device that is provided with a display and has a wireless connection function (e.g., a smart phone, a TV, a laptop PC, or a tablet PC). Such a device may be paired with a smart camera that includes a wireless module. 
         [0032]    In order to ensure that the camera body  200  and the wireless lens unit  100  are wirelessly connected to each other so as to enable the photographing of a picture and a lens control, the main body  200  and the lens unit  100  should include a wireless module therein. Here, it is necessary to determine the wireless module in consideration of a bandwidth of a picture or video image to be exchanged between the lens unit  100  and the main body  200 . For example, as the wireless module, a millimeter wave type, an IEEE 802.11ac type, or the like may be used. Such a wireless module is a Giga-bps grade wireless module, and is suitable for transmitting a picture or video image with high image quality in the case where a photographed picture or video image has high image quality in a high/ultra-definition grade. As another example, a Wireless Fidelity (WiFi) type may be used as the wireless module. In a case where a picture or video image is transmitted from the interchangeable-lens camera in a compressed state, a large bandwidth is not required so that WiFi may be used as a wireless link. As another example, a Wideband Code Division Multiple Access (WCDMA) type, a Long Term Evolution (LTE), or a Bluetooth type may be used as the wireless module. 
         [0033]      FIG. 2A  is a view illustrating a configuration of a wireless lens unit  100  and a main body  200  that constitute an interchangeable-lens camera system according to one embodiment of the present disclosure. The configuration illustrated in  FIG. 2A  is illustrative only, and other configurations may be used without departing from the scope of the present disclosure. 
         [0034]    Referring to  FIG. 2A , the wireless lens unit  100  and the main body  200  include mounts  10  and  20 , respectively. The wireless lens unit  100  and the main body  200  may be coupled to or separated from each other through the mounts  10  and  20 . In order to enable photographing of a picture or video image even in the state where the wireless lens unit  100  and the main body  200  are separated from each other, wireless modules  140  and  210  configured to wirelessly interconnect the wireless lens unit  100  and the main body  200  are included within the wireless lens unit  100  and the main body  200 , respectively. 
         [0035]    The wireless lens unit  100  includes a plurality of lenses  110 , an image sensor  120 , an image processor  130 , a wireless module  140 , a lens controller  150 , a power supplier  160 , and a moving trace measuring device  170 . The power supplier  160  supplies power to each of the components of the wireless lens unit  100 . The lens controller  150  controls the setting of the lenses  110  for the photographing of a picture or video image. For example, the lens controller  150  controls auto-focus, zoom, iris, or the like. The image sensor  120  converts a light received through the lenses  110  into an electric signal. The image processor  130  performs image processing. For example, the image processor  130  removes noise from data received from the image sensor  120  and converts the data to be suitable for a picture or video image format. Here, the image processor  130  converts photographed image data received from the image sensor  120  according to a moving trace of the lens unit  100  and/or the main body  200 . According to one embodiment, the image processor  130  rotates the photographed image data received from the image sensor  120  according to a rotating inclination of the lens unit  100  and/or the main body  200 . According to another embodiment, the image processor  130  zooms in/out the photographed image data received from the image sensor  120  according to forward/backward moving information of the main body  200 . 
         [0036]    The moving trace measuring device  170  measures a moving trace of the lens unit  100 . For example, the moving trace measuring device  170  measures the rotating inclination of the lens unit  100 . For this purpose, the moving trace measuring device  170  may include a gyroscope sensor. The wireless module  140  transmits image data of a picture or video image, which was photographed by the lenses  110  and then processed by the image processor  130 , to the main body  200 . In addition, the wireless module  140  receives, from the main body  200 , the moving trace information of the main body  200  measured by the main body  200 . For example, the moving trace information of the main body  200  includes rotating inclination information of the main body. As another example, the moving trace information of the main body  200  includes forward/backward moving information of the main body. 
         [0037]    The main body  200  includes a wireless module  210 , a storage device  220 , a user input device  230 , a power supplier  240 , a display  250 , and a moving trace measuring device  260 . The wireless module  210  receives image data of a picture or video image transmitted from the wireless lens unit  100 . In addition, the wireless module  210  transmits, to the lens unit  100 , the moving trace information of the main body  200  measured by the moving trace measuring device  260 . For example, the moving trace information of the main body  200  includes rotating inclination information of the main body. As another example, the moving trace information of the main body  200  includes forward/backward moving information of the main body. For this purpose, the moving trace measuring device  260  includes a gyroscope sensor and an acceleration sensor, and may measure the trace of the direction, movement, or the like of the main body  200 . 
         [0038]    The storage device  220  stores the image data of the picture or video image. The display  250  displays the picture or video image such that the user may preview/review the picture or video image. The user input device  230  is provided to allow the user to make an input. For example, the user input device  230  may include a button and a dial for user input, and the display  250  may include a touch screen function for user input. 
         [0039]    The wireless modules  140  and  210 , which are respectively included in the wireless lens unit  100  and the main body  200 , are provided for signal transfer between the wireless lens unit  100  and the main body  200 . For example, the wireless modules  140  and  210  transmit image data photographed by the wireless lens unit  100  to the main body  200 . As another example, the wireless modules  140  and  210  transmit information for the moving trace measured by the main body  200  to the wireless lens unit  100 . In one embodiment, the wireless modules  140  and  210  may be Giga-bps grade wireless modules of a millimeter wave type or an IEEE 802.11ac type. In another embodiment, the wireless modules may use any one of WiFi, WCDMA, LTE, and Bluetooth. 
         [0040]      FIG. 2B  is a view illustrating a configuration of a wireless lens unit  100  and a main body  200  that constitute an interchangeable-lens camera system according to another embodiment of the present disclosure. The configuration illustrated in  FIG. 2B  is illustrative only, and other configurations may be used without departing from the scope of the present disclosure. 
         [0041]    Referring to  FIG. 2B , the wireless lens unit  100  includes a plurality of lenses  110 , an image sensor  120 , a motor  125 , an image processor  130 , a wireless module  140 , a lens controller  150 , a power supplier  160 , and a moving trace measuring device  170 . When comparing with  FIG. 2A , the wireless lens unit  100  illustrated in  FIG. 2B  further includes a motor  125 . The motor  125  is implemented in the form of mechanically rotating the image sensor  120 . For example, the motor  125  may be implemented by an ultrasonic motor that is constituted by being connected to the image sensor  120 . 
         [0042]    As described above, an interchangeable-lens camera according to an embodiment of the present disclosure may be used in a state where the wireless lens unit  100  and the main body  200  are coupled to each other. In such a case, the user may adjust the composition at the time of photographing in a portrait mode, a landscape mode, or an arbitrary mode as desired, by adjusting the main body by a desired angle while viewing the display  250  of the main body  200  or a viewfinder (not illustrated). In addition, in the case where the wireless lens unit  100  and the main body  200  are coupled to each other, the user may easily adjust the focal distance of the lenses. 
         [0043]    Meanwhile, in order to adjust the composition for photographing a picture or video image in the state where the wireless lens unit  100  and the main body  200  are separated from each other, it is necessary to rotate the lens unit  100 , instead of rotating the main body  200 . However, in a case where the lens unit  100  is distant from the user or is not adjustable, it is not easy to perform the composition adjustment, a zoom-in/out adjustment, or the like. Accordingly, various embodiments of the present disclosure propose a method of efficiently controlling a picture or video image by using the main body  200  even in the case where the wireless lens unit  100  and the main body  200  are separated from each other in the interchangeable-lens camera. For this purpose, the wireless lens unit  100  and the main body  200  may include a gyro sensor and an acceleration sensor to measure a moving trace. Various embodiments of the present disclosure may perform a desired composition setting, a focal distance change, an optical/digital zoom processing by exchanging, through a wireless link, the moving trace information of the main body  200  and the moving trace information of the lens unit  100 , which have been measured by sensors. 
         [0044]    According to the embodiments of the present disclosure to be described later, the wireless lens unit and the main body in an interchangeable-lens camera are provided with a moving trace measuring device, such as a gyroscope sensor or an acceleration sensor, so as to determine a moving trace, such as an inclination, a rotation, or a forward/backward movement. The wireless lens unit or the main body transfers moving trace information measured by the moving trace measuring device to the counterpart through a wireless link. The wireless lens unit or the main body combines the received trace information of the counterpart so as to determine whether to rotate, magnify, or minify the image data of a photographed picture or video image, and reflects the determination on the photographing of a picture or a video image. According to one embodiment, when the main body is rotated vertically, horizontally, or with an arbitrary inclination in the state where the wireless lens unit and the main body are separated from each other, the moving trace measuring device of the main body measures the moving trace information of the main body and transmits the moving trace information to the wireless lens unit. Then, the wireless lens unit also rotates a preview video image, a photographed image, or the like vertically, horizontally, or with an arbitrary inclination, similar to the main body. According to another embodiment, when the main body is moved forward/backward in the state where the wireless lens unit and the main body are separated from each other, the moving trace measuring device of the main body measures the moving trace information of the main body and transmits the moving trace information to the wireless lens unit. Then, the wireless lens unit adjusts the focal distance of the lenses according to the movement of the main body, and zooms in/out the photographed image data. Thus, according to the embodiments of the present disclosure, a photographing composition of a picture or video image can be efficiently changed by using the main body when photographing the picture or video image even if the wireless lens unit and the main body are separated from each other. In addition, zoom-in/out can be easily implemented by moving the main body forward or backward. 
         [0045]      FIG. 3  is a view illustrating an operation of an interchangeable-lens camera system according to embodiments of the present disclosure. Such an operation is performed by the image processor  130  illustrated in  FIGS. 2 a    and  2   b.    
         [0046]    Referring to  FIG. 3 , the image processor  130  receives photographed image data from the image sensor  120  at step S 10 . The image processor  130  converts the received photographed image data at step S 20 . For example, the image processor  130  converts the image data according to the moving trace of the lens unit  100  and the moving trace of the main body  200 . The moving trace of the lens unit  100  is measured by the moving trace measuring device  170 . The moving trace of the main body  200  is measured by the moving trace measuring device  260 , and the information for the measured moving trace of the main body  200  is transmitted through the wireless module  210  of the main body  200  and then received by the wireless module  140  of the lens unit  100 . 
         [0047]      FIG. 4A  is a view illustrating an operation of an interchangeable-lens camera system according to one embodiment of the present disclosure. Such an operation is performed by the image processor  130  illustrated in  FIGS. 2 a    and  2   b.    
         [0048]    Referring to  FIG. 4A , the image processor  130  receives photographed image data from the image sensor  120  at S 10 . The image processor  130  rotates the received photographed image data at step S 22 . For example, the image processor  130  rotates the image data according to the rotating inclination of the lens unit  100  and the rotating inclination of the main body  200 . The rotating inclination of the lens unit  100  is measured by the moving trace measuring device  170 . The rotating inclination of the main body  200  is measured by the moving trace measuring device  260 , and the information for the measured rotating inclination of the main body  200  is transmitted through the wireless module  210  of the main body  200  and then received by the wireless module  140  of the lens unit  100 . 
         [0049]      FIG. 4B  is a view illustrating an operation of an interchangeable-lens camera system according to another embodiment of the present disclosure. Such an operation is performed by the image processor  130  illustrated in  FIGS. 2 a    and  2   b.    
         [0050]    Referring to  FIG. 4B , the image processor  130  receives photographed image data from the image sensor  120  at step S 10 . The image processor  130  zooms in/out the received photographed image data at step S 24 . For example, the image processor  130  zooms in/out the image data according to the forward/backward moving information of the main body  200 . The forward/backward moving information of the main body  200  is measured by the moving trace measuring device  260 , and the information for the measured forward/backward moving information of the main body  200  is transmitted through the wireless module  210  of the main body  200 , and then received by the wireless module  140  of the lens unit  100 . 
         [0051]      FIGS. 5A and 5B  are views illustrating configuration examples of a wireless lens unit  100  of an interchangeable-lens camera system for an operation of one embodiment of the present embodiment. The configurations illustrated in  FIGS. 5A and 5B  are illustrative only, and other configurations may be used without departing from the scope of the present disclosure. 
         [0052]    Referring to  FIG. 5A , the wireless lens unit  100  includes an image sensor  120 , an image processor  130 , a motor  125 , a controller  132 , a receiver  142 , and a rotating inclination measuring device  172 . The image sensor  120  converts the light received through the optical lenses  110  illustrated in  FIGS. 2 a  and 2 b    into an electric signal so as to output image data of a photographed picture or video image. The image processor  130  converts the received photographed image data. The receiver  142  is included in the wireless module  140  of the lens unit  100 , and receives information for the rotating inclination of the main body  200 , which was measured by the moving trace measuring device  260  of the main body  200  and then transmitted through the wireless module  210 . The moving trace measuring device  260  of the main body  200  is provided to measure the rotating inclination of the main body  200 , and may be implemented by a gyroscope sensor. The rotating inclination measuring device  172  is included in the moving trace measuring device  170 , and is provided to measure the rotating inclination of the main body  100 . The rotating inclination measuring device  172  may be implemented by a gyroscope sensor. Each of the receiver  142  and the rotating inclination measuring device  172  functions as a moving trace acquisition device configured to acquire the information for the moving traces of the main body  200  and the wireless lens unit  100 . 
         [0053]    The controller  132  is included in the image processor  130 , and controls the motor  125  to mechanically rotate the image sensor  20  according to the rotating inclination of the lens unit  100  that is measured by the rotating inclination measuring device  172  and the rotating inclination of the main body  200 , which is received by the receiver  142 . As the motor  125  rotates the image sensor  120 , rotated image data can be obtained. The motor  125  may be attached to the image sensor  120  to rotate the image sensor  120 , and may be implemented by an ultrasonic motor or the like. 
         [0054]    Referring to  FIG. 5B , the wireless lens unit  100  includes an image sensor  120 , an image processor  130 , a controller  132 , a receiver  142 , and a rotating inclination measuring device  172 . The image sensor  120  converts the light received through the optical lenses  110  illustrated in  FIGS. 2 a  and 2 b    into an electric signal so as to output image data of a photographed picture or video image. The image processor  130  converts the received photographed image data. The receiver  142  is included in the wireless module  140  of the lens unit  100 , and receives information for the rotating inclination of the main body  200 , which was measured by the moving trace measuring device  260  of the main body  200  and then transmitted through the wireless module  210 . The moving trace measuring device  260  of the main body  200  is provided to measure the rotating inclination of the main body  200 , and may be implemented by a gyroscope sensor. The rotating inclination measuring device  172  is included in the moving trace measuring device  170 , and is provided to measure the rotating inclination of the main body  100 . The rotating inclination measuring device  172  may be implemented by a gyroscope sensor. Each of the receiver  142  and the rotating inclination measuring device  172  functions as a moving trace acquisition device configured to acquire the information for the moving traces of the main body  200  and the wireless lens unit  100 . 
         [0055]    The controller  132  is included in the image processor  130 , and calculates a rotating amount based on the rotating inclination of the lens unit  100  that is measured by the rotating inclination measuring device  172  and the rotating inclination of the main body  200  that is received by the receiver  142 , and then transfers the rotating amount to the image processor  130 . The image processor  130  rotates the image data received from the image sensor  120 , and then outputs the rotated image data. In rotating the image data, a coordinate conversion is applied to the received image data so as to rotate the image data. 
         [0056]      FIG. 6  is a view illustrating a configuration example of a wireless lens unit  100  of an interchangeable-lens camera system for an operation of another embodiment of the present embodiment. The configuration illustrated in  FIG. 6  is illustrative only, and other configurations may be used without departing from the scope of the present disclosure. 
         [0057]    Referring to  FIG. 6 , the wireless lens unit  100  includes an image sensor  120 , an image processor  130 , a controller  132 , and a receiver  142 . The image sensor  120  converts the light received through the optical lenses  110  illustrated in  FIGS. 2 a  and 2 b    into an electric signal so as to output image data of a photographed picture or video image. The image processor  130  converts the received photographed image data. The receiver  142  is included in the wireless module  140  of the lens unit  100 , and receives information for the forward/backward movement of the main body  200 , which was measured by the moving trace measuring device  260  of the main body  200  and then transmitted through the wireless module  210 . The moving trace measuring device  260  of the main body  200  is provided to measure the forward/backward movement of the main body  200 , and may be implemented by an acceleration sensor. The receiver  142  functions as a moving trace acquisition device configured to acquire the information for the moving trace of the main body  200 . The controller  132  is included in the image processor  130 . The controller  132  determines a zoom-in/out amount according to the forward/backward movement information of the main body  200  received by the receiver  412  and transfers the zoom-in/out amount to the image processor  130 . The image processor  130  zooms in/out the image data received from the image sensor  120  based on the zoom-in/out amount obtained from the controller  132 , and outputs the zoomed-in/out image data. For example, when the acceleration sensor value, which indicates the moving direction of the main body  200 , is positive (+), the image processor  130  zooms in the image data, and when the acceleration sensor value, which indicates the moving direction of the main body  200 , is negative (−), the image processor  130  zooms out the image data. 
         [0058]    In another embodiment, the controller  132  zooms in or zooms out the image data output from the image sensor  120  by increasing or decreasing the focal distance of the lens control unit  150  illustrated in  FIGS. 2 a  and 2 b   , according to the acceleration sensor value that indicates the moving direction of the main body  200 . For example, when the acceleration sensor value, which indicates the moving direction of the main body  200 , is positive (+), the controller  132  zooms in the image data by increasing the focal distance of the lens control unit  150 , and when the acceleration sensor value, which indicates the moving direction of the main body  200 , is negative (−), the controller  132  zooms out the image data by decreasing the focal distance of the lens control unit  150 . 
         [0059]      FIG. 7  is a view for describing a rotation measuring operation by a wireless lens unit  100  for an image data rotating operation according to one embodiment of the present disclosure. A moving trace measuring device  170 , which is mounted on the wireless lens unit  100  illustrated in  FIGS. 2 a  and 2 b   , may be implemented by a gyroscope sensor. 
         [0060]    Referring to  FIG. 7 , the moving trace measuring device  170 , which is mounted on the wireless lens unit  100 , measures Yaw, Roll, and Pitch, which are rotating information items of the x-axis, y-axis, and z-axis, respectively. For example, when the lens unit  100  is rotated with reference to the Roll axis, the composition of a picture or video image may be changed. Thus, the rotating inclination of the lens unit  100  may be measured with reference to the Roll axis, and the measurement value may be used for changing the composition of a picture or video image. While the descriptions are made with reference to an example of rotating the rotating inclination of the lens unit  100  with reference to the Roll axis, the scope of the present disclosure is not limited thereto. As another example, the Yaw axis or the Pitch axis may be the reference axis for measurement depending on the gyroscope sensor mounting position within the wireless lens unit  100 . 
         [0061]      FIG. 8  is a view for describing rotation measurement and acceleration measurement operations by a main body  200  for image data rotation and zooming operations according to embodiments of the present disclosure. The rotation measurement and acceleration measurement operations by the moving trace measuring device  260  mounted on the main body  200  illustrated in  FIGS. 2 a  and 2 b    may be implemented by a gyroscope sensor and an acceleration sensor. 
         [0062]    Referring to  FIG. 8 , the moving trace measuring device  260 , which is mounted on the wireless lens unit  100 , measures Yaw, Roll, and Pitch, which are rotating information items of the x-axis, y-axis, and z-axis, respectively. For example, when the lens unit  100  is rotated with reference to the Roll axis, the composition of a picture or video image may be changed. Thus, the rotating inclination of the lens unit  100  may be measured with reference to the Roll axis, and the measurement value may be used for changing the composition of a picture or video image. While the descriptions are made with reference to an example of rotating the rotating inclination of the main body  200  with reference to the Roll axis, the scope of the present disclosure is not limited thereto. As another example, the Yaw axis or the Pitch axis may be the reference axis for measurement depending on the gyroscope sensor mounting position within the wireless lens unit  100 . 
         [0063]    In addition, the moving trace measuring device  260  mounted on the wireless lens unit  100  measures the forward/backward movement information of the main body  200  through an acceleration sensor. For example, when the main body  200  moves forward, the moving trace measuring device  260  measures the acceleration having the positive (+) symbol. As another example, when the main body  200  moves backward, the moving trace measuring device  260  measures the acceleration having the negative (−) symbol. 
         [0064]    According to the present disclosure, when the wireless lens unit  100  and the main body  200  are separated from each other in the interchangeable-lens camera, the wireless lens unit  100  and the main body  200  activate the wireless modules  140  and  210 , respectively, and operate while exchanging a camera control message, a picture, or a video image through a wireless link. In the case where the wireless lens unit  100  and the main body  200  are separated from each other, the main body  200  and the wireless lens unit  100  turn ON the gyroscope sensor to measure posture information periodically in order to control the composition of a picture or video image in the main body  200 . The main body  200  and the wireless lens unit  100  calculate how much the main body  200  and the wireless lens unit  100  are inclined with reference to a horizontal axis based on the Roll values that are measured by the main body  200  and the wireless lens unit  100 , respectively. According to an embodiment of the present disclosure, when the wireless lens unit  100  and the main body  200  are separated from each other, the composition of a picture or video image photographed by the wireless lens unit  100  cannot be controlled through the main body  200 . Instead, according to the embodiment of the present disclosure, the composition of a photographed picture or video image can be controlled by rotating the picture or video image photographed by the wireless lens unit  100  by the measurement value. 
         [0065]    Specifically, assuming that the Roll rotation amounts measured by the main body  200  and the wireless lens unit  100  are θ Roll   _   Body  and θ Roll   _   Lens , respectively, the composition control according to the inclination of the horizontal axis of the main body  200  is enabled by rotating the picture or video image photographed by the wireless lens unit  100  by a difference θ Roll   _   Rel  between the rotation amount measured by the main body  200  and the rotation amount measured by the wireless lens unit  100 , as represented in Equation 1. 
         [0000]      θ Roll   _   Rel =θ Roll   _   Body −θ Roll   _   Lens   (1)
 
         [0066]    When the image received by the wireless lenses  110  is rotated by θ Roll   _   Rel , which is the value calculated by Equation 1, the composition can be controlled in the main body  200  as desired. 
         [0067]    The photographed picture or video image can be rotated by θ Roll   _   Rel  through a method of mechanically rotating an image sensor, or a method of implementing through image processing. 
         [0068]      FIG. 9  is a view for describing a method of mechanically rotating an image sensor of a wireless lens unit  100  for an image data rotating operation according to one embodiment of the present disclosure. 
         [0069]    Referring to  FIG. 9 , in the case where the image sensor  120  of the wireless lens unit  100  is coupled to the motor  125  and the image sensor  120  can be controlled through the motor  125  as illustrated in  FIG. 2B , the composition of the picture or video image can be adjusted by rotating the image sensor  120  through the motor  125  by the difference between the measured Roll values of the main body  200  and the wireless lens unit  100 , θ Roll   _   Rel , as illustrated in  FIG. 9 . That is, the composition of the photographed picture of video image is changed by the amount adjusted through the main body  200  by the user. 
         [0070]    An image processing method, which is another method for controlling a composition of a picture or video image, can be implemented by applying a coordinate conversion. A method of obtaining a rotated coordinate image (x rot , y rot ) by rotating an arbitrary coordinate (x org , y org ) of an image entering into the image sensor  120  by θ Roll   _   Rel  is represented as Equation 2. 
         [0000]    
       
         
           
             
               
                 
                   
                     ( 
                     
                       
                         
                           
                             x 
                             rot 
                           
                         
                       
                       
                         
                           
                             y 
                             rot 
                           
                         
                       
                     
                     ) 
                   
                   = 
                   
                     
                       ( 
                       
                         
                           
                             
                               
                                 cos 
                                  
                                 
                                     
                                 
                                  
                                 
                                   θ 
                                   
                                     
                                       Roll 
                                        
                                       _ 
                                        
                                       Re 
                                     
                                      
                                     
                                         
                                     
                                      
                                     l 
                                   
                                 
                               
                               , 
                             
                           
                           
                             
                               
                                 - 
                                 sin 
                               
                                
                               
                                   
                               
                                
                               
                                 θ 
                                 
                                   
                                     Roll 
                                      
                                     _ 
                                      
                                     Re 
                                   
                                    
                                   
                                       
                                   
                                    
                                   l 
                                 
                               
                             
                           
                         
                         
                           
                             
                               
                                 sin 
                                  
                                 
                                     
                                 
                                  
                                 
                                   θ 
                                   
                                     
                                       Roll 
                                        
                                       _ 
                                        
                                       Re 
                                     
                                      
                                     
                                         
                                     
                                      
                                     l 
                                   
                                 
                               
                               , 
                             
                           
                           
                             
                               cos 
                                
                               
                                   
                               
                                
                               
                                 θ 
                                 
                                   
                                     Roll 
                                      
                                     _ 
                                      
                                     Re 
                                   
                                    
                                   
                                       
                                   
                                    
                                   l 
                                 
                               
                             
                           
                         
                       
                       ) 
                     
                     · 
                     
                       ( 
                       
                         
                           
                             
                               x 
                               org 
                             
                           
                         
                         
                           
                             
                               y 
                               org 
                             
                           
                         
                       
                       ) 
                     
                   
                 
               
               
                 
                   ( 
                   2 
                   ) 
                 
               
             
           
         
       
     
         [0071]    Referring to Equation 2, for example, picture data rotated by θ Roll   _   Rel  can be obtained by moving the picture data of a pixel of (x org , y org ) to (x rot , y rot ). The rotation of the picture can be implemented through such image processing. Since cropping may occur in such an image conversion process, it is proper to use an image sensor that is larger than the desired picture size in order to maintain the resolution of the picture. 
         [0072]      FIG. 10  is a view illustrating a processing flow by a wireless lens unit  100  for an image data rotating operation according to one embodiment of the present disclosure. This processing flow provides a method of controlling a composition by using the main body  200  even in the case where the wireless lens unit  100  and the main body  200  are separated from each other. The configuration illustrated in  FIG. 10  is illustrative only, and other configurations may be used without departing from the scope of the present disclosure. 
         [0073]    Referring to  FIG. 10 , at step S 110 , a gyroscope sensor serving as the moving trace measuring device  170  mounted on the wireless lens unit  100  is activated. At step S 120 , the wireless lens unit  100  measures Roll information of the gyroscope sensor, θ Roll   _   Lens . At step S 130 , the wireless lens unit  100  receives Roll information of the gyroscope sensor, θ Roll   _   Body , from the main body  200 . As step S 140 , the wireless lens unit  100  calculates the difference θ Roll   _   Rel  between the received information θ Roll   _   Body  and the measured information θ Roll   _   Lens . At step S 150 , the wireless lens unit  100  determines a rotating method of an image. If the lens unit  100  provides the mechanical rotation of the image sensor  120 , at step S 160 , the wireless lens unit  100  rotates the image sensor  120  by θ Roll   _   Rel  using the motor  125 . If the lens unit  100  does not provide the mechanical rotation of the image sensor  120 , at step S 170 , the wireless lens unit  100  rotates the image by θ Roll   _   Rel  using a coordinate conversion equation as represented by Equation 2. At step S 180 , the wireless lens unit  100  determines whether the wireless lens unit  100  and the main body  200  are coupled to each other. When it is determined that the wireless lens unit  100  and the main body  200  are coupled to each other, the wireless lens unit  100  terminates the operation, and when it is determined that the wireless lens unit  100  and the main body  200  are not coupled to each other, the wireless lens unit  100  returns to step S 120  and performs the operations of steps S 120  to S 170 . 
         [0074]      FIG. 11  is a view illustrating a processing flow by the main body  200  for an image data rotating operation according to one embodiment of the present disclosure. This processing flow provides a method of controlling a composition by using the main body  200  even in the case where the wireless lens unit  100  and the main body  200  are separated from each other. The configuration illustrated in  FIG. 11  is illustrative only, and other configurations may be used without departing from the scope of the present disclosure. 
         [0075]    Referring to  FIG. 11 , at step S 210 , a gyroscope sensor serving as the moving trace measuring device  260  mounted on the main body  200  is activated. At step S 220 , the main body  200  measures Roll information of the gyroscope sensor, θ Roll   _   Body . At step S 230 , the main body  200  transmits Roll information of the gyroscope sensor, θ Roll   _   Body , to the wireless lens unit  100 . At step S 240 , the main body  200  determines whether the wireless lens unit  100  and the main body  200  are coupled to each other. When it is determined that the wireless lens unit  100  and the main body  200  are coupled to each other, the main body  200  terminates the operation, and when it is determined that the wireless lens unit  100  and the main body  200  are not coupled to each other, the main body  200  returns to step S 220  and performs the operations of steps S 220  and S 230 . 
         [0076]    The processes illustrated in  FIGS. 10 and 11  are periodically and continuously repeated in the case where the processes are set such that the user controls a composition based on the main body  200  in the state where the lens unit  100  and the main body  200  are separated from each other. When the main body  200  and the wireless lens unit  100  are coupled to each other or when the composition control setting function based on the main body  100  is turned OFF, the processes illustrated in  FIGS. 10 and 11  are stopped. In such a case, the image processor  130  of  FIGS. 2 a  and 2 b    may initialize the mechanical rotation or the image processing such that θ Roll   _   Rel  becomes zero (θ Roll   _   Rel =0). 
         [0077]    Meanwhile, when performing the above-described composition control operation based on the main body  200 , the gyroscope sensor of the wireless lens unit  100  may not be included. In such a case, in calculating θ Roll   _   Rel , it is assumed that θ Roll   _   Lens =0, and, based on this, the image sensor  120  of the lens unit  100  is rotated or an image itself is rotated. 
         [0078]      FIG. 12  is a view for describing an interaction of the wireless lens unit  100  and the main body  200  for an image data zoom processing operation according to another embodiment of the present disclosure. According to such an embodiment of the present disclosure, when the main body  200  and the wireless lens unit  100  are separated from each other in an interchangeable-lens camera, the user controls zoom-in/out processing for the image data through the main body  200 . According to one embodiment, the zoom-in/out processing may be implemented using an acceleration sensor or a similar sensor. The zoom-in/out processing may also be implemented through a User Interface (UI) that is implemented in a display. 
         [0079]    Referring to  FIG. 12 , when the user moves the main body  200  forward, an acceleration sensor mounted on the main body  200  as the moving trace measuring device  260  measures a positive (+) acceleration. On the contrary, when the user moves the main body  200  backward, an acceleration sensor mounted on the main body  200  as the moving trace measuring device  260  measures a negative (−) acceleration. The main body  200  transmits the measured acceleration value or the symbol of the acceleration to the wireless lens unit  100  through a wireless link. Then, the wireless lens unit  100  controls the lens control unit  150  using the received acceleration information so as to adjust the focal distance of the optical lenses  110  and performs zoom-in/out with respect to a photographed screen. 
         [0080]    When the main body  200  is moved forward in the state where the wireless lens unit  100  and the main body  200  are separated from each other, the wireless lens unit  100  increases the focal distance of the optical lenses  110  by the positive (+) acceleration measured by the acceleration sensor. Then, the wireless lens unit  100  zooms in the photographed image data, and transmits the zoomed-in image data to the main body  200 . As a result, the main body  200  can obtain a zoomed-in screen. On the contrary, when the main body  200  is moved backward while in the state where the wireless lens unit  100  and the main body  200  are separated from each other, the wireless lens unit  100  decreases the focal distance of the optical lenses  110  by the negative (+) acceleration measured by the acceleration sensor. Then, the wireless lens unit  100  zooms out the photographed image data, and transmits the zoomed-out image data to the main body  200 . As a result, the main body  200  can obtain a zoomed-out screen. When the zoom processing based on the focal distance change of the optical lenses  110  is not possible any more, a digital zoom may be used. 
         [0081]    Meanwhile, in order to perform a zoom-in/out processing function according to the present disclosure, the main body  200  may be provided with a gesture recognition button. Only when the gesture recognition button is pushed, zoom-in/out is adapted to be executed according to the forward or backward movement of the main body  200 . In one embodiment, the gesture recognition button may be implemented as a UI on the display  250  in which a touch screen is included. In another embodiment, the gesture recognition button may be implemented as a mechanical button. 
         [0082]      FIG. 13  is a view illustrating a processing flow by a wireless lens unit  100  for an image data zoom processing operation according to one embodiment of the present disclosure. The processing flow corresponds to the processing operation of the wireless lens unit  100  in the case where the user controls zoom-in/out processing for the image data through the main body  200  in the state where the main body  200  and the wireless lens unit  100  are separated from each other in an interchangeable-lens camera. The configuration illustrated in  FIG. 13  is illustrative only, and other configurations may be used without departing from the scope of the present disclosure. 
         [0083]    Referring to  FIG. 13 , at step S 310 , the wireless lens unit  100  receives acceleration information that corresponds to the acceleration sensor value measured by the main body  200 . The acceleration information may be an acceleration symbol or an acceleration value. After receiving the acceleration information, the wireless lens unit  100  changes the focal distance of the optical lenses  110  included in the wireless lens unit  100  according to the acceleration symbol or value. In the case where it is confirmed that the acceleration measured by the acceleration sensor of the main body  200  is positive (+) ((+) at step S 320 ), at step S 330 , the wireless lens unit  100  increases the focal distance of the optical lenses  110  so as to zoom in the image data. In the case where it is confirmed that the acceleration measured by the acceleration sensor of the main body  200  is negative (−) ((−) at step S 320 ), at step S 340 , the wireless lens unit  100  decreases the focal distance of the optical lenses  110  so as to zoom out the image data. In one embodiment, when the acceleration value is large, the focal distance conversion is performed more rapidly, and when the acceleration value is small, the focal distance conversion is performed slowly. Thereafter, the zoomed-in/out image data is transmitted to the main body  200 , and as a result, the screen displayed on the display  250  of the main body  200  is zoomed in/zoomed out. At step S 350 , the wireless lens unit  100  determines whether the wireless lens unit  100  and the main body  200  are coupled to each other. When it is determined that the wireless lens unit  100  and the main body  200  are coupled to each other, the wireless lens unit  100  terminates the operation, and when it is determined that the wireless lens unit  100  and the main body  200  are not coupled to each other, the wireless lens unit  100  returns to step S 310  and performs the operations of steps S 310  to S 340 . 
         [0084]      FIG. 14  is a view illustrating a processing flow by the main body  200  for an image data zoom processing operation according to one embodiment of the present disclosure. The processing flow corresponds to the processing operation of the main body  200  in the case where the user controls the zoom-in/out processing for image data through the main body  200  in the state where the main body  200  and the wireless lens unit  100  are separated from each other in an interchangeable-lens camera. The configuration illustrated in  FIG. 14  is illustrative only, and other configurations may be used without departing from the scope of the present disclosure. 
         [0085]    Referring to  FIG. 14 , at step S 410 , the main body  200  determines whether the gesture recognition button is pushed. When it is determined that the gesture recognition button is pushed, at step S 420 , the main body  200  measures the value of the acceleration sensor, and transmits the acceleration information, such as a measured acceleration symbol or acceleration value, to the wireless lens unit  100 . Then, after receiving the acceleration information, the wireless lens unit  100  changes the focal distance of the optical lenses  110  included in the wireless lens unit  100  according to the acceleration symbol or value so as to zoom in or zoom out the photographed image data. The image data zoomed in/zoomed out in this way is transmitted to the main body  200 . 
         [0086]    At step S 430 , the main body  200  receives zoomed-in/out image from the wireless lens unit  100 , and zooms in/out a screen displayed on the display  250 . At step S 440 , the main body  200  determines whether the wireless lens unit  100  and the main body  200  are coupled to each other. When it is determined that the wireless lens unit  100  and the main body  200  are coupled to each other, the main body  200  terminates the operation, and when it is determined that the wireless lens unit  100  and the main body  200  are not coupled to each other, the main body  200  returns to step S 410  and performs the operations of steps S 410  to S 430 . 
         [0087]    The processes illustrated in  FIGS. 13 and 14  and described above may be executed when the gesture recognition button provided in the main body  200  is pushed in the state where the wireless lens unit  100  and the main body  200  are separated from each other, and may be stopped when the wireless lens unit  100  and the main body  200  are coupled to each other. Unlike the embodiment illustrated in  FIGS. 13 and 14 , as illustrated in  FIG. 6 , the controller  132  may zoom in/out the image data received from the image sensor  120  according to the forward/backward movement information of the main body  200  received by the receiver  142 , thereby outputting zoomed-in/out image data. For example, when the acceleration sensor value, which indicates the moving direction of the main body  200 , is positive (+), the controller  132  zooms in the image data, and when the acceleration sensor value, which indicates the moving direction of the main body  200 , is negative (−), the controller  132  zooms out the image data. 
         [0088]    As described above, according to embodiments of the present disclosure, the wireless lens unit and the main body in an interchangeable-lens camera are provided with a moving trace measuring device, such as a gyroscope sensor or an acceleration sensor, so as to determine a moving trace, such as an inclination, a rotation, or a forward/backward movement. The wireless lens unit or the main body transfers moving trace information measured by the moving trace measuring device to the counterpart through a wireless link. The wireless lens unit or the main body combines the received trace information of the counterpart so as to determine whether to rotate, magnify, or minify the image data of a photographed picture or video image, and reflects the determination on the photographing of a picture or video image. According to one embodiment, when the main body is rotated vertically, horizontally, or with an arbitrary inclination in the state where the wireless lens unit and the main body are separated from each other, the moving trace measuring device of the main body measures the moving trace information of the main body and transmits the moving trace information to the wireless lens unit. Then, the wireless lens unit also rotates a preview video image, a photographed image, or the like vertically, horizontally, or with an arbitrary inclination, similar to the main body. According to another embodiment, when the main body is moved forward/backward in the state where the wireless lens unit and the main body are separated from each other, the moving trace measuring device of the main body measures the moving trace information of the main body and transmits the moving trace information to the wireless lens unit. Then, the wireless lens unit adjusts the focal distance of the lenses according to the movement of the main body, and zooms in/out the photographed image data. Thus, according to the embodiments of the present disclosure, a photographing composition of a picture or a video image can be efficiently changed by using the main body when photographing the picture or video image even if the wireless lens unit and the main body are separated from each other. In addition, zoom-in/out can be easily implemented by moving the main body forward/backward. 
         [0089]    While the present disclosure has been described above with reference to restricted embodiments and drawings, the present disclosure is not limited to the above-described embodiments, and various modifications and variations may be made based on the descriptions of the embodiments by a person ordinarily skilled in the art to which the present disclosure belongs. For example, while the embodiments of the present disclosure have been described with reference to a case where the embodiments are applied to an interchangeable-lens camera system that is constituted with a wireless lens unit  100  and a main body  200 , the main body  200  may not only be a camera body, but also, for example, a smart phone, a TV, a tablet PC, or a laptop PC which includes a display. The wireless lens unit  100  may also be a smart camera. As other examples, in the embodiments of the present disclosure, descriptions have been made with reference to the case in which the wireless lens unit  100  is configured as illustrated in  FIG. 2A ,  FIG. 2B ,  FIG. 5A ,  FIG. 5B , or  FIG. 6 , and operates as illustrated in the flowcharts of  FIG. 10  and  FIG. 13 , and the case in which the main body  200  is configured as illustrated in  FIG. 2A  or  FIG. 2B , and operates as illustrated in the flowcharts of  FIG. 11  and  FIG. 14 , but the scope of the present disclosure to be protected shall not be necessarily limited thereto. The operations according to the embodiments of the present disclosure may also be implemented by a single processor. In such a case, program commands for performing the operations implemented by various computers may be stored in a computer-readable medium. The computer readable medium may include a program command, a data file, a data structure, and the like independently or in combination. The program command may be things specially designed and configured for the present disclosure, or things that are well known to and can be used by those skilled in the related art. For example, the computer readable recoding medium includes magnetic media such as a hard disk, a floppy disk, and a magnetic tape, optical media such as a CD-ROM and a DVD, magneto-optical media such as a floptical disk, and hardware devices such as a ROM, RAM, and a flash memory, which are specially constructed in such a manner that they can store and execute a program command. Examples of the program command include a machine language code generated by a compiler and a high-level language code executable by a computer through an interpreter and the like. Therefore, the scope of the present disclosure should not be defined as being limited to the embodiments, but should be defined by the appended claims and equivalents thereof.