Patent Publication Number: US-11042223-B2

Title: Electronic device for recognizing user&#39;s gesture

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a National Phase Entry of PCT International Application No. PCT/KR2019/001380, which was filed on Jan. 31, 2019, and claims a priority to Korean Patent Application No. 10-2018-0012654, which was filed on Feb. 1, 2018, the contents of which are incorporated herein by reference. 
     TECHNICAL FIELD 
     Embodiments disclosed in this specification relate to an electronic device that recognizes a user&#39;s gesture. 
     BACKGROUND ART 
     With the development of technology, various types of electronic devices have been developed. In particular, electronic devices such as robots capable of performing various functions are released in a wide range of fields. The robots have been mainly limited to industrial robots in the past. However, nowadays, the use and application fields of robots, such as public places, home, or the like, are gradually expanding. 
     Nowadays, as the level of technology such as speech recognition, artificial intelligence, or the like increases, robots capable of communicating with users and performing operations depending on various commands of users are being developed. For example, the robots may recognize a user&#39;s voice or action and may provide the user with specified information or necessary functions based on the recognized voice or action. 
     DISCLOSURE 
     Technical Problem 
     An electronic device such as a robot may include a camera module capable of recognizing a user&#39;s action or gesture. However, the field of view (FoV) of the camera module mounted on the robot may be limited, and thus the FoV at which the electronic device may recognize the user&#39;s action or gesture while the electronic device is stopped may be limited. 
     When the user notify the electronic device that the user points to the specified region, it may be difficult for the electronic device to recognize the indicated region in response to the user&#39;s action immediately due to the limited FoV. 
     Furthermore, when the region recognized by the electronic device is different from the region intended by the user, the electronic device may request the user to enter a new input again. Because the user needs to repeat the indication operation late, the user&#39;s convenience may deteriorate. 
     Embodiments disclosed in this specification are intended to provide the electronic device for solving the above-described problem and problems brought up in this specification. 
     Technical Solution 
     According to an embodiment disclosed in this specification, an electronic device may include at least one sensor, a camera module having a field of view (FoV) in a specified range, an actuator configured to change a shooting direction of the camera module, and a processor electrically connected to the at least one sensor, the camera module, and the actuator. The processor may be configured to obtain a command from a user, using the at least one sensor, to control the actuator in response to obtaining the command such that the user is included in the FOV of the camera module, to change the shooting direction of the camera module, to obtain gesture information about a moving gesture of the user as an input through the camera module, and to perform the command based on a specified region determined by the obtained space information and the obtained gesture information when all the gesture information is obtained as an input. While obtaining the gesture information, the processor may be configured to obtain first gesture information of the gesture information from the camera module, from a first time point to a second time point, to control the actuator such that the FoV is changed based on a direction determined by the obtained first gesture information, at the second time point, to obtain space information corresponding to the changed FOV through the camera module, to control the actuator such that the user is included in the FoV of the camera module, at a third time point after the second time point, and to obtain second gesture information of the gesture information from the camera module, after the third time point. 
     According to another embodiment disclosed in this specification, a gesture-based command performing method of an electronic device may include obtaining a command from a user, using a sensor, controlling an actuator in response to obtaining the command such that the user is included in a FOV of a camera module, to change the shooting direction of the camera module, obtaining first gesture information about a moving gesture of the user through the camera module, from a first time point to a second time point, controlling the actuator such that the FoV is changed based on a direction determined by the first gesture information, at the second time point, obtaining space information corresponding to the changed FOV through the camera module, controlling the actuator such that the user is included in the FoV of the camera module, at a third time point after the second time point, obtaining second gesture information about the moving gesture of the user through the camera module, after the third time point, and performing the command based on a specified region determined by the obtained space information and the obtained gesture information when all the gesture information is obtained as an input. 
     Advantageous Effects 
     According to embodiments disclosed in this specification, even when a user points to a region out of the FoV of an electronic device, an electronic device may recognize the indicated region in response to the operation indicated by the user directly. Besides, it is possible to allow the electronic device to increase the accuracy of recognition for the user&#39;s command, by providing the user with information about a specified region corresponding to the user&#39;s gesture in real time. In this way, the user&#39;s convenience may be increased. Besides, a variety of effects directly or indirectly understood through the disclosure may be provided. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG. 1  illustrates an electronic device recognizing a user&#39;s gesture, according to an embodiment. 
         FIG. 2  is a block diagram of an electronic device recognizing a user&#39;s gesture according to an embodiment. 
         FIG. 3  is a flowchart, in which an electronic device recognizes a user&#39;s gesture and performs a predefined command, according to an embodiment. 
         FIG. 4  is a flowchart, in which an electronic device recognizes a user&#39;s gesture and performs a predefined command, according to an embodiment. 
         FIG. 5  illustrates a method in which an electronic device estimates a user&#39;s gesture, according to an embodiment. 
         FIG. 6  illustrates an embodiment, in which an electronic device expands a specified region, according to an embodiment. 
         FIG. 7A  illustrates a method, in which an electronic device provides a specified voice feedback based on a recognized object, according to an embodiment. 
         FIG. 7B  illustrates a method, in which an electronic device provides a specified voice feedback with respect to a boundary of a recognized object, according to an embodiment. 
         FIG. 7C  illustrates a method, in which an electronic device recognizes a plurality of objects and provides specified voice feedbacks, according to an embodiment. 
         FIG. 8  is a flowchart, in which an electronic device recognizes a user&#39;s gesture and performs a predefined command, according to an embodiment. 
         FIG. 9  is a block diagram of an electronic device recognizing a gesture in a network environment, according to various embodiments. 
     
    
    
     With regard to description of drawings, the same or similar components may be marked by the same or similar reference numerals. 
     MODE FOR INVENTION 
       FIG. 1  illustrates an electronic device recognizing a user&#39;s gesture, according to an embodiment. 
     Referring to  FIG. 1 , an electronic device  100  may include a camera module, and the camera module may have a FoV  101  of a limited range. In this specification, the FoV  101  of the camera module may be understood to be the same as the FoV  101  of the electronic device  100 . 
     According to an embodiment, the electronic device  100  may obtain a voice command of a user  1  or a command by a gesture  10   a . According to an embodiment, the voice command may include a specified voice. For example, the voice command may include a specified voice such as “Bixby”, “Hi! Bixby”, “Goodbye Bixby”, or the like. In an embodiment, the specified voice may execute the speech recognition function of the electronic device  100 . 
     According to an embodiment, the electronic device  100  may be configured to watch the user  1  in response to the input of the specified voice. For example, the FoV  101  of the electronic device  100  may be changed in a direction in which the voice is input. According to another embodiment, the electronic device  100  may be configured to provide the user with a specified response when the specified voice is input. For example, a voice for requesting the user  1  to enter an additional input may be provided to the electronic device  100  in response to the input of the specified voice. 
     According to an embodiment, the FoV  101  of the camera module has a limited range, and thus the FoV  101  of the camera module does not include the user  1  at the time of obtaining a voice command of the user  1 . In this case, the electronic device  100  may change the shooting direction of the camera module in response to the acquisition of the voice command such that the user  1  is included in the FoV  101  of the camera module. 
     According to an embodiment, the electronic device  100  may recognize a gesture  10   a  of the user  1  and may obtain the direction of the specified body part of the user  1 , for example, the hand of the user  1 , as the input to the specified command. According to an embodiment, the direction indicated by the hand of the user  1  may be estimated by various algorithms. For example, the electronic device  100  may estimate the direction as a direction formed by connecting and extending at least two locations of the body of the user  1 , such as a head, shoulders, hands, or fingertips of the user  1 . 
     According to an embodiment, the gesture  10   a  of the user  1  may be a moving gesture. For example, when the user  1  sets the specified region  10   b  in the specified direction, the user  1  may repeat the gesture  10   a  for drawing a substantial circle or polygon by hand. 
     In an embodiment, the electronic device  100  may obtain gesture information at a specified time interval. In an embodiment, as the specified time point interval decreases, the gesture information about the user&#39;s gesture may be obtained more detailed. 
     For example, the gesture information may include the coordinates of a specified body part of the user  1 , for example, a hand. For another example, the gesture information may include a direction vector of the gesture  10   a . As described above, the direction vector may be estimated by various algorithms. 
     According to an embodiment, the FoV  101  of the camera module may have a limited range, and thus the FoV  101  of the camera module may not include a region  10   b  indicated by the user  1  at a point in time when the electronic device  100  recognizes the gesture  10   a  of the user  1 . In this case, to obtain space information about the region  10   b  indicated by the user  1 , the electronic device  100  may change the FoV  101  based on the direction determined by the gesture  10   a  of the user  1 . For example, the electronic device  100  may obtain a part of the gesture information during a specified time. A part of the obtained gesture information may include a direction vector of the gesture  10   a ; the electronic device  100  may change the FoV  101  in a direction corresponding to the direction vector. 
     According to an embodiment, the electronic device  100  may obtain space information corresponding to the changed FoV  101 . For example, the electronic device  100  may obtain image information corresponding to the changed FoV  101  through a camera module. For example, the image information may include structures, shapes, distances, or a type or size of the positioned object with respect to the region indicated by the user  1 . 
     According to an embodiment, the electronic device  100  may obtain information about the specified region  10   b  that the user  1  wants to indicate, based on a part of the obtained space information and previously-obtained gesture information. For example, the electronic device  100  may obtain information of a target to be indicated by the user  1  or space coordinates of a point to be indicated, based on the space information and the part of gesture information. 
     According to an embodiment, the electronic device  100  may change the FoV  101  again to obtain the rest other than the part of the gesture information. When the electronic device  100  changes the FoV  101  again to obtain the rest of the gesture information, the electronic device  100  may obtain information about the specified region  10   b  indicated by the user  1  based on the previously-obtained space information and gesture information. 
     According to an embodiment, when the electronic device  100  obtains information about the specified region  10   b , the electronic device  100  may perform various operations based on the specified region  10   b . For example, an operation of organizing objects in the specified region  10   b  may be performed based on the voice command of the user  1 . In this case, the electronic device  100  may obtain information about objects in the specified region  10   b , and may perform the operation on the objects that satisfy a specified condition based on the obtained information. For example, the electronic device  100  may perform the operation on only the object, of which the size is smaller than a specified size. 
     According to an embodiment, gesture information not obtained while the electronic device  100  changes the FoV  101  such that the electronic device  100  obtains space information may be estimated in various ways. For example, the electronic device  100  may estimate the gesture information based on a part of the gesture information obtained before the space information is obtained and another part of the gesture information obtained after the space information is obtained. For another example, the electronic device  100  may estimate the gesture information from a part of gesture information obtained before the space information is obtained. 
     According to an embodiment, the electronic device  100  may obtain information about the specified region  10   b  indicated by the user  1 , based on the obtained space information and the obtained or estimated gesture information. According to an embodiment, the electronic device  100  may play a feedback sound source based on the obtained space information and the obtained or estimated gesture information. For example, the electronic device  100  may distinguish information about a point indicated by the current user  1  as a specified sound source based on the obtained space information and the currently-obtained gesture information to provide the information to the user  1  in real time. In this way, the user  1  may determine the sameness between the point recognized by the electronic device  100  and the point intended by the user  1 . 
       FIG. 2  is a block diagram of an electronic device recognizing a user&#39;s gesture according to an embodiment. 
     Referring to  FIG. 2 , the electronic device  100  may include a speech recognition sensor  110 , a camera module (alternatively, a camera or a camera including a circuit)  120 , an actuator  130 , and a processor  140 . According to various embodiments, the electronic device  100  may further include a component not illustrated in  FIG. 2  or may not include a part of the components illustrated in  FIG. 2 . For example, the electronic device  100  may further include a memory to store space information or gesture information obtained through the camera module  120 . For another example, the electronic device  100  may further include a speaker for playing a feedback sound source. 
     The speech recognition sensor  110  may be a sensor for obtaining a voice command of a user (e.g., the user  1  of  FIG. 1 ) as an input. For example, the speech recognition sensor  110  may include a microphone. According to an embodiment, the speech recognition sensor  110  may include a plurality of filters to distinguish a user&#39;s voice. Through the plurality of filters, the speech recognition sensor  110  may detect only the meaningful voice command of the user and may transmit the meaningful voice command to the processor  140 . 
     The camera module  120  may obtain image data corresponding to the FoV of the electronic device  100 . According to an embodiment, the camera module  120  may have the FoV (e.g., the FoV  101  of  FIG. 1 ) of the limited range. As the range of the FoV is limited, the image capable of being obtained by the camera module  120  at a specified time point may be limited to the specified range. For example, the image data obtained by the camera module  120  at the specified time point may not include at least one of a user and a target indicated by the user. 
     According to an embodiment, the plurality of camera modules  120  may be present. In an embodiment, the plurality of camera modules  120  may have different FoVs, respectively. For example, the FoV of the first camera module may include the user and may not include the target indicated by the user; the FoV of the second camera module may include the target indicated by the user and may not include the user. In this case, the electronic device  100  may alternately obtain the gesture information of the user and space information of the region indicated by the user by selectively activating the plurality of camera modules  120 . 
     According to an embodiment, the camera may be a 3D camera. The 3D camera may be the camera module  120  that obtains image data including depth information. 
     The actuator  130  may be electrically connected to the camera module  120 , and may change the shooting direction of the camera module  120 . For example, the actuator  130  may change the shooting direction of the camera module  120  such that the user is included in the FoV of the camera module  120 . For another example, the actuator  130  may change the shooting direction of the camera module  120  such that the FoV of the camera module  120  includes the region indicated by the user. 
     The processor  140  may be electrically connected to the speech recognition sensor  110 , the camera module  120 , and the actuator  130  and may be configured to control the operations of the configurations. For example, the processor  140  may control the operation of the actuator  130  to change the shooting direction of the camera module  120 . 
     According to an embodiment, the processor  140  may process information obtained by the electronic device  100 . For example, the processor  140  may determine whether a specified voice for performing a specified command is included from a voice signal obtained by the speech recognition sensor  110 . For another example, the processor  140  may obtain gesture information of a user and space information of a region indicated by the user, from the image data obtained by the camera module  120 . The processor  140  may estimate a specified region indicated by the user based on the obtained gesture information and space information. For another example, the processor  140  may estimate another part of gesture information through a part of gesture information obtained through the camera module  120 . 
     According to various embodiments, the description of each configuration of the above-mentioned electronic device is only an embodiment and is not limited thereto. In addition, in this specification, the same contents as described in  FIG. 2  may be applied to the components having the same reference numerals as the electronic device  100  shown in  FIG. 2 . 
       FIG. 3  is a flowchart, in which an electronic device recognizes a user&#39;s gesture and performs a predefined command, according to an embodiment. 
     Referring to  FIG. 3 , an operation in which an electronic device (e.g., the electronic device  100  of  FIGS. 1 and 2 ) according to an embodiment recognizes a gesture (e.g., the gesture  10   a  of  FIG. 1 ) of a user (e.g., the user  1  of  FIG. 1 ) and performs a predefined command may include operation  301  to operation  317 . 
     In operation  301 , the electronic device  100  may obtain a voice command from the user. According to an embodiment, the voice command may include a specified voice. In an embodiment, when the voice command includes the specified voice, the electronic device  100  may determine that the voice command is a meaningful input; when the voice command does not include the specified voice, the electronic device may ignore the voice command. 
     In operation  303 , the electronic device  100  may change the shooting direction of the camera module in response to the acquisition of the voice command such that the user is included in the FoV of the camera module (e.g., the camera module  120  in  FIG. 2 ). In an embodiment, the shooting direction may be controlled by an actuator. 
     According to an embodiment, before performing the operation  303 , the electronic device  100  may perform an operation of determining whether the user is included in the FoV of the camera module  120 . In this case, when the user is included in the FoV of the camera module  120 , operation  303  may be omitted. 
     In operation  305 , the electronic device  100  may obtain a first portion of a user&#39;s gesture information from a first time point to a second time point. The first portion of the gesture information may be referred to as first gesture information. In an embodiment, the gesture information may include coordinates of a user&#39;s body part and a direction vector of a gesture. The electronic device may determine the direction indicated by the user through the first gesture information. 
     In operation  307 , the electronic device  100  may change the shooting direction of the camera module  120  based on the direction determined through the first gesture information. For example, the electronic device may control the actuator such that the FoV of the camera module  120  is changed at the second time point. 
     In operation  309 , the electronic device  100  may obtain space information corresponding to the changed FoV. The space information may include a specified location corresponding to the first gesture information. 
     In operation  311 , the electronic device  100  may change the shooting direction of the camera module  120  again such that the user is included in the FoV of the camera module  120  at a third time point after the second time point. For example, the electronic device may control the actuator such that the FoV of the camera module  120  is changed. 
     In operation  313 , the electronic device  100  may obtain gesture information after the third time point, for example, the second portion of the gesture information through the camera module  120 . The second portion may be referred to as second gesture information. 
     For example, coordinates of a body part may be estimated between the second time point and the third time point based on the coordinates of the body part included in the first gesture information at the second time point and the coordinates of the body part included in the second gesture information at the third time point. 
     In operation  315 , the electronic device  100  may determine the specified region (e.g., the specified region  10   b  of  FIG. 1 ) indicated by the user based on the space information and the obtained gesture information. In an embodiment, when determining the specified region, the electronic device  100  may estimate gesture information between the second time point and the third time point. For example, the electronic device  100  may estimate coordinates of a body part between the second time point and the third time point based on the coordinates of the body part included in the first gesture information at the second time point and the coordinates of the body part included in the second gesture information at the third time point. 
     According to an embodiment, the operation of determining the specified region may be performed from obtaining space information in operation  309  to a point in time when the second gesture information is obtained in operation  313 . According to an embodiment, the operation  315  may be performed simultaneously with operation  309  to operation  313 . 
     In operation  317 , the electronic device  100  may perform a predefined command based on the specified region determined in operation  315 . In an embodiment, the predefined command may be set in various manners. For example, the predefined command may be a command for organizing objects in the specified region. For another example, the predefined command may be a command for prohibiting the electronic device  100  from accessing the specified region. For still another example, the predefined command may be a command for providing information of objects located in the specified region. 
     Through operations  301  to operations  317 , the electronic device  100  may determine a specified region corresponding to the gesture indicated by a user, and may perform a predefined command on the determined specified region. 
       FIG. 4  is a flowchart, in which an electronic device recognizes a user&#39;s gesture and performs a predefined command, according to an embodiment. 
     Referring to  FIG. 4 , an operation in which an electronic device (e.g., the electronic device  100  of  FIGS. 1 and 2 ) according to an embodiment recognizes a gesture (e.g., the gesture  10   a  of  FIG. 1 ) of a user (e.g., the user  1  of  FIG. 1 ) and performs a predefined command may include operation  401  to operation  419 . In  FIG. 4 , with regard to the description given with reference to  FIG. 3 , additional description will be omitted to avoid redundancy. 
     In operation  401  to operation  411 , the electronic device  100  may perform the same operation as operation  301  to operation  311  illustrated in  FIG. 3 . For example, the electronic device  100  may obtain a user&#39;s voice command, may change the shooting direction, and may obtain gesture information at first and second time points, for example, first gesture information. The electronic device  100  may obtain space information by changing the shooting direction again, and then may change the shooting direction back to the user&#39;s direction. 
     In operation  413 , the electronic device  100  may estimate the second portion of gesture information. The second portion may be referred to as second gesture information. In an embodiment, it may be understood that the second gesture information is a portion in which the electronic device  100  does not directly obtain a user&#39;s gesture, for example, gesture information about a user&#39;s gesture during a time period between the second time point and the third time point. 
     According to an embodiment, the electronic device  100  may estimate the second gesture information based on the first gesture information obtained in operation  405  and the elapsed time between the second time point and the third time point. 
     In operation  415 , the electronic device  100  may obtain a third portion of gesture information. The third portion may be referred to as third gesture information. In an embodiment, the third gesture information may be gesture information about a user&#39;s gesture after the third time point. When the third gesture information is obtained, the electronic device  100  may obtain all of the gesture information as an input, including the first gesture information and the second gesture information. 
     In operation  417 , the electronic device  100  may perform the same or similar operation to operation  313  illustrated in  FIG. 3 . For example, at the second time point when the space information is obtained in operation  409 , the electronic device may obtain the first gesture information and may estimate some of the second gesture information. The electronic device  100  may determine a specified region (e.g., the specified region  10   b  in  FIG. 1 ) at the second time point based on the space information and the obtained or estimated gesture information. For another example, after the second time point, the electronic device  100  may estimate the remaining parts of the second gesture information and may obtain the third gesture information. After the second time point, the electronic device may determine the specified region based on the space information and the obtained or estimated gesture information. 
     In operation  419 , the electronic device  100  may perform the same operation as operation  317  illustrated in  FIG. 3 . For example, the electronic device may perform a predefined command based on the specified region determined in operation  417 . 
     Through operations  401  to operations  419 , the electronic device  100  may determine a specified region corresponding to the gesture indicated by a user, and may perform a predefined command on the determined specified region. 
       FIG. 5  illustrates a method in which an electronic device estimates a user&#39;s gesture, according to an embodiment. 
     Referring to  FIG. 5 , gesture information about a gesture (e.g., the gesture  10   a  in  FIG. 1 ) of a user (e.g., the user  1  in  FIG. 1 ) which changes over time may be identified. According to an embodiment, an electronic device (e.g., the electronic device  100  of  FIGS. 1 and 2 ) may obtain gesture information at a specified time interval from a first time point to a second time point. For example, the electronic device  100  may obtain gesture information at the first to k-th points  511  to  514  from the first time point to the second time point. In an embodiment, the gesture information may include coordinates (e.g., coordinates P 0    511  at the first point) and direction vector (e.g., a first vector V 0    521 ) of a user&#39;s body part. 
     According to an embodiment, the electronic device  100  may estimate gesture information after the second time point, based on the gesture information obtained from the first time point to the second time point. For example, the electronic device  100  may estimate gesture information at the (k+1)-th to (k+n)-th points  515  to  517  after the second time point, based on gesture information at the (k−2)-th to k-th points  512  to  514  obtained from the first time point to the second time point. 
     According to an embodiment, the coordinates of the position of a hand at point ‘t’ may be represented by P t ; the amount of change in the coordinates may be represented by Δ t =P t −P t−1 . According to an embodiment, the direction vector at point T may be represented by V t ; and the amount of change in the direction vector may be represented by d t =V t −V t−1 . 
     According to an embodiment, the gesture information may be estimated based on the gesture information obtained or estimated before the estimated time point. For example, the coordinates at the (k+1)-th point  515  may be estimated as E[P k+1 ]=P k +(Δ k  (Δ k −Δ k−1 )). The direction vector  525  at the (k+1)-th point  515  may be estimated as 
     
       
         
           
             
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     Through the process, the electronic device may sequentially estimate gesture information after the second time point. 
       FIG. 6  illustrates an embodiment, in which an electronic device expands a specified region, according to an embodiment. 
     Referring to  FIG. 6 , the electronic device (e.g., the electronic device  100  of  FIGS. 1 and 2 ) may obtain a voice command of a user (e.g., the user  1  of  FIG. 1 ) and may determine a specified region in response to the acquisition of the voice command. For example, as illustrated in  FIG. 6 , the electronic device  100  may determine that a first region  610  is the specified region. For example, the specified region may be determined depending on the flowchart illustrated in  FIG. 3 or 4 . 
     According to an embodiment, the electronic device  100  may obtain information about objects included in the specified region. For example, the information about a object may include the size of the object, the distance to the object, and the color of the object. According to an embodiment, the electronic device  100  may determine whether the object is partially included in the specified region. For example, as illustrated in  FIG. 6 , it may be determined whether a whole first object  60  is included in the first region  610  or whether only the part of the first object  60  is included in the first region  610 . 
     According to an embodiment, when the electronic device  100  recognizes the first object  60  that is only partially included in the first region  610 , the electronic device  100  may expand the determined specified region from the first region  610  to a second region  620  including the whole first object  60 . Even though the region actually specified by user is the first region  610 , the electronic device  100  may recognize that the specified region is the second region  620  and may perform a predefined command. 
     For example, the user may indicate the first region  610  while instructing the electronic device  100  to prohibit the access to the first object  60  illustrated in  FIG. 6 . In this case, the first region  610  actually indicated by the user includes only a part of the first object  60 . However, the electronic device  100  may determine that the specified region indicated by the user is the second region  620  and may perform an access prohibition command on the whole first object  60 . 
       FIG. 7A  illustrates a method, in which an electronic device provides a specified voice feedback based on a recognized object, according to an embodiment. 
     Referring to  FIG. 7A , the electronic device  100  may provide different feedback sound sources depending on a object disposed at the location indicated by a user. For example, the electronic device  100  may provide different sound sources depending on a first target  71   a  and a second target  72   a . The first graph  710   a  illustrated in  FIG. 7A  may represent a feedback sound source for the first target  71   a ; the second graph  720   a  may represent a feedback sound source for the second target  72   a . To provide the feedback sound source, the electronic device  100  may include a speaker. 
     According to an embodiment, the electronic device  100  may obtain information about a target indicated by the user in real time depending on a gesture operation of the user. In an embodiment, when the electronic device  100  obtains a part of gesture information, for example, first gesture information, and then obtains space information, the electronic device  100  may obtain information about a target indicated by the user, based on the obtained gesture information and the obtained space information. In another embodiment, when the electronic device  100  estimates a part of the gesture information, for example, second gesture information estimated from the first gesture information, after obtaining the space information, the electronic device  100  may obtain information about a target indicated by the user, based on at least part of the space information and the estimated gesture information. 
     According to an embodiment, the electronic device  100  may provide a specified sound source to the user based on the obtained information. For example, the electronic device  100  may differently adjust the pitch or period of a specified sound source based on the obtained information. The electronic device  100  may provide the user with information about a target recognized by the electronic device  100  in real time by playing the adjusted sound source. According to an embodiment, the information about the target may include at least one of the distance to the target, the size of the target, and the boundary of the target. 
     According to an embodiment, the electronic device  100  may adjust the pitch of a sound source based on the size of the target indicated by the user. For example, when the size of the target is relatively large, the electronic device  100  may play the sound source having a relatively high sound. For another example, when the size of the target is relatively small, the electronic device  100  may play the sound source having a relatively low sound. 
     According to an embodiment, the electronic device  100  may adjust the period of the sound source based on the distance to the target indicated by the user. For example, when the distance to the target is relatively long, the electronic device  100  may play the sound source having a relatively long period. For another example, when the distance to the target is relatively short, the electronic device  100  may play the sound source having a relatively short period. 
     According to an embodiment, because the size of the first target  71   a  is relatively small and the distance from the electronic device  100  is relatively short, as illustrated in the first graph  710   a , the sound source having a high pitch may be played at a short period. 
     According to an embodiment, because the size of the second target  72   a  is relatively large and the distance from the electronic device  100  is relatively long, as illustrated in the second graph  720   a , the sound source having a low pitch may be played at a long period. 
     In this way, the electronic device  100  may provide the user with information about the target recognized by the electronic device  100 ; the user may determine whether the target recognized by the electronic device  100  is the same as the target intended by the user. 
       FIG. 7B  illustrates a method, in which an electronic device provides a specified voice feedback with respect to a boundary of a recognized object, according to an embodiment. 
     Referring to  FIG. 7B , the electronic device  100  may provide a feedback sound source as the point indicated by a user is moved. The point indicated by the user may be moved from a first point  721   b  to a second point  722   b  in a first direction  7   b  with respect to a first target  71   b . A first graph  710   b  may represent the feedback sound source played as the point indicated by the user is moved as described above. 
     According to an embodiment, when the boundary of the first target  71   b  indicated by the user is reached, the electronic device  100  may play a specified sound source in a specified manner such that the user may recognize the boundary of the first target  71   b . As illustrated in the first graph  710   b , for example, the electronic device  100  may change the pitch of the sound as soon as the boundary of the target indicated by the user is reached. 
     Referring to the first graph  710   b , as the point indicated by the user is moved from the first point  721   b  in the first direction  7   b , the electronic device  100  may provide a constant feedback sound source; when the point indicated by the user reaches the second point  722   b , the electronic device  100  may provide the feedback sound source whose pitch is changed. 
     In this way, the electronic device  100  may provide the user with information about the target recognized by the electronic device  100 ; the user may determine whether the target recognized by the electronic device  100  is the same as the target intended by the user. 
       FIG. 7C  illustrates a method, in which an electronic device recognizes a plurality of objects and provides specified voice feedbacks, according to an embodiment. 
     Referring to  FIG. 7C , when the point indicated by a user is moved from a first point  721   c  to a second point  722   c  in a first direction  7   c , the electronic device  100  may provide a user with a specified feedback sound source. According to an embodiment, the point indicated by the user may be moved from the first point  721   c  to the second point  722   c  in the first direction  7   c . As described above, the first graph  710   c  may represent a feedback sound source played by the electronic device  100  when the point indicated by the user is moved. 
     According to an embodiment, the point indicated by the user may be moved in the order of a first target  71   c , a background  74   c , a second target  72   c , the background  74   c , and a third target  73   c . Referring to the first graph  710   c , it may be seen that the pitch or period to be played is different depending on the size or distance of each target; it may be seen that the pitch is changed at the boundary of each target. 
     According to an embodiment, as illustrated in  FIG. 7C , as the point indicated by the user is changed, the electronic device  100  may play feedback sound sources having different characteristics. In this way, the electronic device  100  may provide the user with information about the currently-recognized point in real time; the user may determine whether the electronic device  100  recognizes the currently-recognized point, which the actual user intends, through the provided information. 
       FIG. 8  is a flowchart, in which an electronic device recognizes a user&#39;s gesture and performs a predefined command, according to an embodiment. 
     Referring to  FIG. 8 , an operation in which an electronic device (e.g., the electronic device  100  of  FIGS. 1 and 2 ) according to an embodiment recognizes a gesture (e.g., the gesture  10   a  of  FIG. 1 ) of a user (e.g., the user  1  of  FIG. 1 ) and performs a predefined command may include operation  801  to operation  825 . In  FIG. 8 , with regard to the description given with reference to  FIG. 4 , additional description will be omitted to avoid redundancy. 
     According to an embodiment, in operation  801  to operation  813  illustrated in  FIG. 8 , the electronic device  100  may perform the same operation as operation  401  to operation  413  illustrated in  FIG. 4 . For example, the electronic device  100  may obtain a user&#39;s voice command, may change the shooting direction, and may obtain gesture information at first and second time points, for example, first gesture information. The electronic device  100  may obtain space information by changing the shooting direction again, and then may change the shooting direction back to the user&#39;s direction. The electronic device  100  may estimate gesture information from a second time point to a third time point, which does not face the user, for example, second gesture information based on first gesture information and an elapsed time between the second time point and a third time point. 
     In operation  815 , the electronic device  100  may evaluate the accuracy of second gesture information estimated in the operation  813 . For example, in operation  813 , the electronic device  100  may estimate gesture information during a time period between the second time point and the third time point. At the third time point, because the electronic device  100  is facing the user, the electronic device  100  may obtain gesture information at the third time point from the camera module (e.g., the camera module  120  of  FIG. 2 ). The electronic device  100  may compare the obtained gesture information at the third time point with the estimated gesture information at the third time point; in this way, the electronic device  100  may calculate the accuracy of the second gesture information. 
     In an embodiment, when the calculated accuracy is higher than a specified level, the electronic device  100  may perform operation  817 . When the calculated accuracy is lower than the specified level, the electronic device  100  may perform operation  819 . 
     In operation  817 , the electronic device  100  may trust the second gesture information estimated in operation  813 , and thus may obtain third gesture information. In this way, the electronic device may obtain or estimate all pieces of gesture information about the user&#39;s gesture including the first gesture information, the second gesture information, and the third gesture information. 
     In operation  819 , the electronic device  100  may not trust the second gesture information estimated in operation  813 , and thus may obtain new gesture information from the user. For example, the electronic device  100  may delete gesture information entered before the third time point and newly obtain gesture information after the third time point. For another example, the electronic device  100  may play a specified sound source to allow the user to make a request for a new gesture at the third time point. In this way, the electronic device may obtain all pieces of gesture information about the user&#39;s gesture. 
     In operation  821 , the electronic device  100  may determine a specified region (e.g., the specified region  10   b  of  FIG. 1 ) indicated by the user based on space information and gesture information and may play a specified feedback sound source. In an embodiment, the gesture information may be gesture information being obtained or estimated. For example, the gesture information may include the second gesture information estimated in operation  813  and may include gesture information newly obtained in operation  819 . In an embodiment, an operation of determining the specified region and playing the specified feedback sound source may be performed in real time as the point indicated by the user is moved. 
     In operation  823 , the electronic device  100  may determine information about a object positioned in the specified region. For example, the electronic device  100  may determine whether all objects are included in the specified region or whether only a part of objects is included in the specified region. For another example, the electronic device may determine the size, type, or the like of a object included in the specified region. 
     In operation  825 , the electronic device  100  may perform a predefined command based on information about the object determined in operation  823 . For example, the electronic device  100  may perform a command to prohibit the access to the object included in the specified region. For another example, the electronic device  100  may perform a command for organizing objects included in the specified region. In this case, the electronic device  100  may perform an operation on a object, of which the size is smaller than a specified size, based on information about the object determined in operation  823 . 
     Through operations  801  to operations  825 , the electronic device  100  may determine a specified region corresponding to the gesture indicated by a user in real time, and may provide the user with the feedback on the specified region in real time. The electronic device may perform a predefined command on the determined specified region. 
       FIG. 9  is a block diagram of an electronic device in a network environment according to various embodiments. 
     Referring to  FIG. 9 , an electronic device  901  may communicate with an electronic device  902  through a first network  998  (e.g., a short-range wireless communication) or may communicate with an electronic device  904  or a server  908  through a second network  999  (e.g., a long-distance wireless communication) in a network environment  900 . According to an embodiment, the electronic device  901  may communicate with the electronic device  904  through the server  908 . According to an embodiment, the electronic device  901  may include a processor  920 , a memory  930 , an input device  950 , a sound output device  955 , a display device  960 , an audio module  970 , a sensor module  976 , an interface  977 , a haptic module  979 , a camera module  980 , a power management module  988 , a battery  989 , a communication module  990 , a subscriber identification module  996 , and an antenna module  997 . According to some embodiments, at least one (e.g., the display device  960  or the camera module  980 ) among components of the electronic device  901  may be omitted or other components may be added to the electronic device  901 . According to some embodiments, some components may be integrated and implemented as in the case of the sensor module  976  (e.g., a fingerprint sensor, an iris sensor, or an illuminance sensor) embedded in the display device  960  (e.g., a display). 
     The processor  920  may operate, for example, software (e.g., a program  940 ) to control at least one of other components (e.g., a hardware or software component) of the electronic device  901  connected to the processor  920  and may process and compute a variety of data. The processor  920  may load a command set or data, which is received from other components (e.g., the sensor module  976  or the communication module  990 ), into a volatile memory  932 , may process the loaded command or data, and may store result data into a nonvolatile memory  934 . According to an embodiment, the processor  920  may include a main processor  921  (e.g., a central processing unit or an application processor) and an auxiliary processor  923  (e.g., a graphic processing device, an image signal processor, a sensor hub processor, or a communication processor), which operates independently from the main processor  921 , additionally or alternatively uses less power than the main processor  921 , or is specified to a designated function. In this case, the auxiliary processor  923  may operate separately from the main processor  921  or embedded. 
     In this case, the auxiliary processor  923  may control, for example, at least some of functions or states associated with at least one component (e.g., the display device  960 , the sensor module  976 , or the communication module  990 ) among the components of the electronic device  901  instead of the main processor  921  while the main processor  921  is in an inactive (e.g., sleep) state or together with the main processor  921  while the main processor  921  is in an active (e.g., an application execution) state. According to an embodiment, the auxiliary processor  923  (e.g., the image signal processor or the communication processor) may be implemented as a part of another component (e.g., the camera module  980  or the communication module  990 ) that is functionally related to the auxiliary processor  923 . The memory  930  may store a variety of data used by at least one component (e.g., the processor  920  or the sensor module  976 ) of the electronic device  901 , for example, software (e.g., the program  940 ) and input data or output data with respect to commands associated with the software. The memory  930  may include the volatile memory  932  or the nonvolatile memory  934 . 
     The program  940  may be stored in the memory  930  as software and may include, for example, an operating system  942 , a middleware  944 , or an application  946 . 
     The input device  950  may be a device for receiving a command or data, which is used for a component (e.g., the processor  920 ) of the electronic device  901 , from an outside (e.g., a user) of the electronic device  901  and may include, for example, a microphone, a mouse, or a keyboard. 
     The sound output device  955  may be a device for outputting a sound signal to the outside of the electronic device  901  and may include, for example, a speaker used for general purposes, such as multimedia play or recordings play, and a receiver used only for receiving calls. According to an embodiment, the receiver and the speaker may be either integrally or separately implemented. 
     The display device  960  may be a device for visually presenting information to the user of the electronic device  901  and may include, for example, a display, a hologram device, or a projector and a control circuit for controlling a corresponding device. According to an embodiment, the display device  960  may include a touch circuitry or a pressure sensor for measuring an intensity of pressure on the touch. 
     The audio module  970  may convert a sound and an electrical signal in dual directions. According to an embodiment, the audio module  970  may obtain the sound through the input device  950  or may output the sound through an external electronic device (e.g., the electronic device  902  (e.g., a speaker or a headphone)) wired or wirelessly connected to the sound output device  955  or the electronic device  901 . 
     The sensor module  976  may generate an electrical signal or a data value corresponding to an operating state (e.g., power or temperature) inside or an environmental state outside the electronic device  901 . The sensor module  976  may include, for example, a gesture sensor, a gyro sensor, a barometric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an infrared sensor, a biometric sensor, a temperature sensor, a humidity sensor, or an illuminance sensor. 
     The interface  977  may support a designated protocol wired or wirelessly connected to the external electronic device (e.g., the electronic device  902 ). According to an embodiment, the interface  977  may include, for example, an HDMI (high-definition multimedia interface), a USB (universal serial bus) interface, an SD card interface, or an audio interface. 
     A connecting terminal  978  may include a connector that physically connects the electronic device  901  to the external electronic device (e.g., the electronic device  902 ), for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (e.g., a headphone connector). 
     The haptic module  979  may convert an electrical signal to a mechanical stimulation (e.g., vibration or movement) or an electrical stimulation perceived by the user through tactile or kinesthetic sensations. The haptic module  979  may include, for example, a motor, a piezoelectric element, or an electric stimulator. 
     The camera module  980  may shoot a still image or a video image. According to an embodiment, the camera module  980  may include, for example, at least one lens, an image sensor, an image signal processor, or a flash. 
     The power management module  988  may be a module for managing power supplied to the electronic device  901  and may serve as at least a part of a power management integrated circuit (PMIC). 
     The battery  989  may be a device for supplying power to at least one component of the electronic device  901  and may include, for example, a non-rechargeable (primary) battery, a rechargeable (secondary) battery, or a fuel cell. 
     The communication module  990  may establish a wired or wireless communication channel between the electronic device  901  and the external electronic device (e.g., the electronic device  902 , the electronic device  904 , or the server  908 ) and support communication execution through the established communication channel. The communication module  990  may include at least one communication processor operating independently from the processor  920  (e.g., the application processor) and supporting the wired communication or the wireless communication. According to an embodiment, the communication module  990  may include a wireless communication module  992  (e.g., a cellular communication module, a short-range wireless communication module, or a GNSS (global navigation satellite system) communication module) or a wired communication module  994  (e.g., an LAN (local area network) communication module or a power line communication module) and may communicate with the external electronic device using a corresponding communication module among them through the first network  998  (e.g., the short-range communication network such as a Bluetooth, a WiFi direct, or an IrDA (infrared data association)) or the second network  999  (e.g., the long-distance wireless communication network such as a cellular network, an internet, or a computer network (e.g., LAN or WAN)). The above-mentioned various communication modules  990  may be implemented into one chip or into separate chips, respectively. 
     According to an embodiment, the wireless communication module  992  may identify and authenticate the electronic device  901  using user information stored in the subscriber identification module  996  in the communication network. 
     The antenna module  997  may include one or more antennas to transmit or receive the signal or power to or from an external source. According to an embodiment, the communication module  990  (e.g., the wireless communication module  992 ) may transmit or receive the signal to or from the external electronic device through the antenna suitable for the communication method. 
     Some components among the components may be connected to each other through a communication method (e.g., a bus, a GPIO (general purpose input/output), an SPI (serial peripheral interface), or an MIPI (mobile industry processor interface)) used between peripheral devices to exchange signals (e.g., a command or data) with each other. 
     According to an embodiment, the command or data may be transmitted or received between the electronic device  901  and the external electronic device  904  through the server  908  connected to the second network  999 . Each of the electronic devices  902  and  904  may be the same or different types as or from the electronic device  901 . According to an embodiment, all or some of the operations performed by the electronic device  901  may be performed by another electronic device or a plurality of external electronic devices. When the electronic device  901  performs some functions or services automatically or by request, the electronic device  901  may request the external electronic device to perform at least some of the functions related to the functions or services, in addition to or instead of performing the functions or services by itself. The external electronic device receiving the request may carry out the requested function or the additional function and transmit the result to the electronic device  901 . The electronic device  901  may provide the requested functions or services based on the received result as is or after additionally processing the received result. To this end, for example, a cloud computing, distributed computing, or client-server computing technology may be used. 
     According to embodiments disclosed in this specification, even when a user points to a region out of the FoV of an electronic device, an electronic device may recognize the indicated region in response to the operation indicated by the user directly. Besides, it is possible to allow the electronic device to increase the accuracy of recognition for the user&#39;s command, by providing the user with information about a specified region corresponding to the user&#39;s gesture in real time. In this way, the user&#39;s convenience may be increased. 
     The electronic device according to various embodiments disclosed in the present disclosure may be various types of devices. The electronic device may include, for example, at least one of a portable communication device (e.g., a smartphone), a computer device, a portable multimedia device, a mobile medical appliance, a camera, a wearable device, or a home appliance. The electronic device according to an embodiment of the present disclosure should not be limited to the above-mentioned devices. 
     It should be understood that various embodiments of the present disclosure and terms used in the embodiments do not intend to limit technologies disclosed in the present disclosure to the particular forms disclosed herein; rather, the present disclosure should be construed to cover various modifications, equivalents, and/or alternatives of embodiments of the present disclosure. With regard to description of drawings, similar components may be assigned with similar reference numerals. As used herein, singular forms may include plural forms as well unless the context clearly indicates otherwise. In the present disclosure disclosed herein, the expressions “A or B”, “at least one of A or/and B”, “A, B, or C” or “one or more of A, B, or/and C”, and the like used herein may include any and all combinations of one or more of the associated listed items. The expressions “a first”, “a second”, “the first”, or “the second”, used in herein, may refer to various components regardless of the order and/or the importance, but do not limit the corresponding components. The above expressions are used merely for the purpose of distinguishing a component from the other components. It should be understood that when a component (e.g., a first component) is referred to as being (operatively or communicatively) “connected,” or “coupled,” to another component (e.g., a second component), it may be directly connected or coupled directly to the other component or any other component (e.g., a third component) may be interposed between them. 
     The term “module” used herein may represent, for example, a unit including one or more combinations of hardware, software and firmware. The term “module” may be interchangeably used with the terms “logic”, “logical block”, “part” and “circuit”. The “module” may be a minimum unit of an integrated part or may be a part thereof. The “module” may be a minimum unit for performing one or more functions or a part thereof. For example, the “module” may include an application-specific integrated circuit (ASIC). 
     Various embodiments of the present disclosure may be implemented by software (e.g., the program  940 ) including an instruction stored in a machine-readable storage media (e.g., an internal memory  936  or an external memory  938 ) readable by a machine (e.g., a computer). The machine may be a device that calls the instruction from the machine-readable storage media and operates depending on the called instruction and may include the electronic device (e.g., the electronic device  901 ). When the instruction is executed by the processor (e.g., the processor  920 ), the processor may perform a function corresponding to the instruction directly or using other components under the control of the processor. The instruction may include a code generated or executed by a compiler or an interpreter. The machine-readable storage media may be provided in the form of non-transitory storage media. Here, the term “non-transitory”, as used herein, is a limitation of the medium itself (i.e., tangible, not a signal) as opposed to a limitation on data storage persistency. 
     According to an embodiment, the method according to various embodiments disclosed in the present disclosure may be provided as a part of a computer program product. The computer program product may be traded between a seller and a buyer as a product. The computer program product may be distributed in the form of machine-readable storage medium (e.g., a compact disc read only memory (CD-ROM)) or may be distributed only through an application store (e.g., a Play Store™). In the case of online distribution, at least a portion of the computer program product may be temporarily stored or generated in a storage medium such as a memory of a manufacturer&#39;s server, an application store&#39;s server, or a relay server. 
     Each component (e.g., the module or the program) according to various embodiments may include at least one of the above components, and a portion of the above sub-components may be omitted, or additional other sub-components may be further included. Alternatively or additionally, some components (e.g., the module or the program) may be integrated in one component and may perform the same or similar functions performed by each corresponding components prior to the integration. Operations performed by a module, a programming, or other components according to various embodiments of the present disclosure may be executed sequentially, in parallel, repeatedly, or in a heuristic method. Also, at least some operations may be executed in different sequences, omitted, or other operations may be added. 
     While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.