Patent Publication Number: US-2017354844-A1

Title: Detection apparatus, detection system, motion analysis system, recording medium, and analysis method

Description:
TECHNICAL FIELD 
     The present invention relates to a detection apparatus, a detection system, a motion analysis system, a recording medium recording an analysis program, and an analysis method. 
     BACKGROUND ART 
     In recent years, there have been needs for apparatuses analyzing motion of a subject (human) in various fields. For example, a motion form of a subject (athlete), such as a swing trajectory of an exercise appliance such as a golf club, a tennis racket, or a baseball bat, is analyzed and an exercise appliance suitable for the athlete is selected or the motion form is improved on the basis of analysis results so that athletic ability of the athlete can be increased. 
     Regarding such a motion analysis apparatus and a motion analysis method, for example, PTL 1 discloses a motion detection apparatus and a motion analysis method using an optical motion capture device. This apparatus captures an image of a measurement target object (a subject or an exercise appliance) attached with a marker by using an infrared camera or the like, and analyzes motion by calculating a movement trajectory of the marker by using the captured image. 
     Regarding a motion analysis apparatus and a motion analysis method, for example, PTL 2 discloses a motion detection apparatus and a motion analysis method in which motion of a subject due to a swing of an exercise appliance is detected by an inertial sensor attached to a subject, and the motion is analyzed on the basis of motion data of the subject which is output from the inertial sensor. Such an apparatus has an advantage that motion capture means such as an infrared camera is not necessary, and handling is easy. 
     However, when motion of a subject is detected by using an angular velocity sensor as an inertial sensor, and the motion is analyzed, it is necessary to remove a bias of the inertial sensor. In other words, it is necessary to determine the origin of motion of a subject. 
     The bias collectively indicates a zero bias in an initial state in which angular velocity is zero before a subject starts motion, and a drift caused by an external factor such as a power source fluctuation or a temperature change. 
     In order to remove the bias, it is necessary to obtain a bias value in an initial state. For example, a standing still period in which a subject stands still is set before a swing is started in swing analysis of a golf club. A bias value in an initial state is determined on the basis of a signal output from an angular velocity sensor, and the like in a predetermined period with detection of the standing still state as a trigger. In other words, the origin of motion of a subject is determined. 
     In the motion analysis apparatus and the motion analysis method disclosed in PTL 2, since the angular velocity sensor or the like in which a detection direction is defined according to an assumed coordinate system is used as an inertial sensor acquiring motion data, it is necessary to match a motion direction of a subject with a movement direction assumed by the inertial sensor in a case where the inertial sensor is attached to a subject, in order to analyze motion of the subject with high accuracy. For example, a mark indicating a movement direction assumed by the inertial sensor is stuck to the inertial sensor, and a direction indicated by the mark is matched with a motion direction of a subject with the naked eyes when the inertial sensor is attached to the subject. 
     CITATION LIST 
     Patent Literature 
     PTL 1: JP-A-2010-110382 
     PTL 2: JP-A-2008-73210 
     SUMMARY OF INVENTION 
     Technical Problem 
     However, in a case where a standing still state of a subject is detected on the basis of a signal output from an angular velocity sensor or the like, if the subject moves very slow, a standing still state of the subject is wrongly detected, and thus the origin of motion is erroneously determined. Therefore, a bias value cannot be accurately determined in the standing still state, and, as a result, there is a problem in that a motion state of the subject cannot be accurately analyzed, and a notification of a wrong motion state is performed. Since a distance between a ball hitting surface of a golf club and a golf ball is not constant in a standing still state of a subject, there is a problem in that a motion state cannot be analyzed with high accuracy. 
     When an inertial sensor is attached to a subject, in a method in which a direction indicated by a mark stuck to the inertial sensor is matched with a motion direction of the subject with the naked eyes, in a case where a motion direction of the subject is not clearly shown, or in a case where the motion direction is separated from the inertial sensor mark even if clearly shown, it is hard to match a direction indicated by the mark with a motion direction of the subject with the naked eyes with high accuracy through adjustment, and thus there is a problem in that a lot of time is required for attachment and adjustment. 
     Solution to Problem 
     The invention has been made in order to solve at least some of the above-described problems, and the invention can be realized in the following aspects or application examples. 
     Application Example 1 
     A detection apparatus according to this application example includes a sensor portion that is attached to an exercise appliance, and detects a swing motion of the exercise appliance; and an image capturing portion that captures an image of a part of interest. 
     According to this configuration, since a motion state is analyzed on the basis of a captured image of the part of interest obtained by the image capturing portion and an output signal detected by the sensor portion, it is possible to analyze the motion state of the exercise appliance with higher accuracy than in a case where analysis is performed by using only the sensor portion. 
     Application Example 2 
     The detection apparatus according to the application example may further include a notification portion that performs a notification of a motion state of the exercise appliance which is analyzed on the basis of at least one of an output signal from the sensor portion and a captured image obtained by the image capturing portion. 
     Application Example 3 
     In the detection apparatus according to the application example, it is preferable that the part of interest is a ball hitting portion for hitting a ball through the swing motion of the exercise appliance. 
     According to this configuration, it is possible to analyze a motion state of the ball hitting portion by imaging the ball hitting portion. 
     Application Example 4 
     In the detection apparatus according to the application example, it is preferable that the motion state includes a standing still state of the exercise appliance which is determined on the basis of a plurality of captured images obtained by capturing images of the ball hitting portion with the passage of time. 
     According to this configuration, it is possible to determine a standing still state of the exercise appliance on the basis of a plurality of captured images obtained by imaging the ball hitting portion with the passage of time. 
     Application Example 5 
     In the detection apparatus according to the application example, the standing still state may be a state in which the exercise appliance stands still before the swing motion is started with the exercise appliance. 
     Application Example 6 
     In the detection apparatus according to the application example, the exercise appliance may be a golf club, and the sensor portion and the image capturing portion are attached to a shaft or a grip of the golf club. 
     Application Example 7 
     In the detection apparatus according to the application example, the sensor portion and the image capturing portion may be accommodated in the same casing. 
     Application Example 8 
     In the detection apparatus according to the application example, the exercise appliance includes the part of interest, and the detection apparatus further includes a determination portion that extracts a predetermined reference image from a captured image of the part of interest obtained by the image capturing portion, and determines the quality of an attachment position where the sensor portion is attached to the exercise appliance on the basis of the extracted predetermined reference image. 
     According to this configuration, an image of the part of interest of the exercise appliance is captured, a predetermined reference image is extracted from the captured image of the part of interest, and the quality of an attachment position of the sensor portion attached to the exercise appliance is determined on the basis of the extracted predetermined reference image. Therefore, since the quality of an attachment position of the sensor portion is determined on the basis of the extracted predetermined reference image extracted from the captured image, it is possible to quickly and highly accurately adjust an attachment position of the sensor portion compared with a case where adjustment is performed with the naked eyes. 
     Application Example 9 
     A motion analysis system according to this application example includes an analysis unit that analyzes the motion state of the exercise appliance on the basis of a captured image obtained by the image capturing portion and an output signal from the sensor portion. 
     According to this configuration, since a motion state is analyzed on the basis of a captured image of the part of interest obtained by the image capturing portion and an output signal detected by the sensor portion, it is possible to analyze the motion state of the exercise appliance with higher accuracy than in a case where analysis is performed by using only the sensor portion. 
     Application Example 10 
     In the motion analysis system according to the application example, it is preferable that the detection apparatus transmits the captured image and the output signal to the analysis unit, and the analysis unit performs analysis on the basis of the captured image and the output signal so as to output a trigger signal indicating the motion state of the exercise appliance. 
     According to this configuration, in a case where the detection apparatus receives a trigger signal indicating a state of an output signal in the analysis unit, the detection apparatus can output a motion state in the analysis unit on the basis of the trigger signal. 
     Application Example 11 
     In the motion analysis system according to the application example, it is preferable that the analysis unit determines standing-still of the exercise appliance on the basis of the captured image, and analyzes the swing motion on the basis of the output signal. 
     According to this configuration, standing-still of the exercise appliance is determined on the basis of a captured image, and thus it is possible to accurately determine the standing-still of the exercise appliance. 
     Application Example 12 
     A detection system according to this application example includes an image capturing portion that captures an image of a part of interest of an exercise appliance to which a sensor portion detecting a swing motion is attached; and a determination portion that extracts a predetermined reference image from a captured image of the part of interest obtained by the image capturing portion, and determines the quality of an attachment position where the sensor portion is attached to the exercise appliance on the basis of the extracted predetermined reference image. 
     According to this configuration, an image of the part of interest of the exercise appliance is captured, a predetermined reference image is extracted from the captured image of the part of interest, and the quality of an attachment position of the sensor portion attached to the exercise appliance is determined on the basis of the extracted predetermined reference image. Therefore, since the quality of an attachment position of the sensor portion is determined on the basis of the extracted predetermined reference image extracted from the captured image, it is possible to quickly and highly accurately adjust an attachment position of the sensor portion compared with a case where adjustment is performed with the naked eyes. 
     Application Example 13 
     In the detection system according to the application example, it is preferable that the image capturing portion captures an image of the part of interest from a direction of viewing the part of interest from the sensor portion attached to the exercise appliance. 
     According to this configuration, an image of the part of interest is captured from the sensor portion attached to the exercise appliance, and thus it is possible to acquire an accurate attachment situation of the sensor portion. 
     Application Example 14 
     In the detection system according to the application example, it is preferable that the determination portion determines the quality of the attachment position on the basis of a difference between a direction specified on the basis of the predetermined reference image and a preset reference direction. 
     According to this configuration, it is possible to determine the quality of an attachment position of the sensor portion with high accuracy on the basis of a difference between a direction of the predetermined reference image and a reference direction. 
     Application Example 15 
     It is preferable that the detection system according to the application example further includes a notification portion that performs a notification of a result determined by the determination portion. 
     According to this configuration, it is possible to perform a notification of a determination result of the quality of an attachment position of the sensor portion. 
     Application Example 16 
     In the detection system according to the application example, the predetermined reference image may be an image of a reference mark provided on the exercise appliance. 
     Application Example 17 
     It is preferable that the detection system according to the application example further includes a projection portion that projects the predetermined reference image onto the part of interest. 
     According to this configuration, a predetermined reference image is projected onto a part of interest, and thus the predetermined reference image can be set regardless of the part of interest. 
     Application Example 18 
     It is preferable that the detection system according to the application example further includes a sensor unit; and an analysis unit that is connected to the sensor unit through communication with the sensor unit, the sensor unit includes the sensor portion; and the image capturing portion, and the analysis unit includes the determination portion. 
     According to this configuration, since the sensor unit detects a swing motion of the exercise appliance, captures an image of a part of interest corresponding to the exercise appliance, and the analysis unit determines the quality of an attachment position of the sensor portion, it is possible to miniaturize the sensor unit. 
     Application Example 19 
     An analysis system according to this application example includes a sensor portion that is attached to an exercise appliance and detects motion information of the exercise appliance; an image capturing portion that captures an image of a location including a part of interest of the exercise appliance; an image processing portion that acquires distance information regarding a distance between the part of interest and a predetermined target object on the basis of a captured image obtained by the image capturing portion; an analysis portion that analyzes a swing motion of the exercise appliance on the basis of the motion information; and a correction portion that corrects at least one of the motion information and an analysis result in the analysis portion by using the distance information. 
     According to this configuration, distance information between the part of interest and the predetermined target object is acquired on the basis of a captured image of the part of interest obtained by the image capturing portion, a swing motion of the exercise appliance is analyzed on the basis of motion information acquired by the sensor portion, and at least one of the motion information and an analysis result is corrected by using the distance information. Therefore, an error of the motion information is improved, and thus a motion state of the exercise appliance can be analyzed with high accuracy. 
     Application Example 20 
     In the analysis system according to the application example, it is preferable that the image processing portion analyzes an image having undergone image processing, and calculates the distance information by counting the number of pixels forming the image. 
     According to this configuration, the distance information is calculated by counting the number of pixels forming the image having undergone image processing, and thus it is possible to accurately calculate the distance information. 
     Application Example 21 
     In the analysis system according to the application example, it is preferable that the analysis portion analyzes trajectory information regarding a trajectory along which the exercise appliance is moved on the basis of the motion information, and the correction portion corrects the trajectory information by using the distance information. 
     According to this configuration, since the trajectory information is corrected on the basis of the distance information, it is possible to increase reliability of a trajectory of the exercise appliance. 
     Application Example 22 
     In the analysis system according to the application example, it is preferable that the analysis portion determines whether or not the exercise appliance stands still on the basis of the distance information in each of a plurality of captured images obtained with the passage of time. 
     According to this configuration, it is possible to accurately determine a standing still state of the exercise appliance on the basis of a plurality of captured images obtained with the passage of time. 
     Application Example 23 
     In the analysis system according to the application example, the part of interest may be a ball hitting portion for hitting the target object through a swing motion of the exercise appliance. 
     Application Example 24 
     It is preferable that the analysis system according to the application example further includes a sensor unit that is attached to the exercise appliance; and an analysis unit that performs communication with the sensor unit, the sensor unit includes the sensor portion; and the image capturing portion, the analysis unit includes the image processing portion; the correction portion; and the analysis portion, and the motion information and the captured images are transmitted from the sensor unit to the analysis unit through the communication. 
     According to this configuration, since the sensor unit detects a swing motion of the exercise appliance, and captures an image of the part of interest corresponding to the exercise appliance, and the analysis unit analyzes the swing motion of the exercise appliance, it is possible to miniaturize the sensor unit attached to the exercise appliance. 
     Application Example 25 
     A recording medium according to this application example records an analysis program causing a computer to execute an image processing function of acquiring distance information regarding a distance between a part of interest of an exercise appliance and a predetermined target object on the basis of a captured image of the part of interest obtained by an image capturing portion, the exercise appliance being attached with a sensor portion detecting motion information; an analysis function of analyzing a swing motion of the exercise appliance on the basis of the motion information; and a correction function of correcting at least one of the motion information and an analysis result of the swing motion by using the distance information. 
     According to this configuration, distance information between the part of interest and the predetermined target object is acquired on the basis of a captured image of the part of interest obtained by the image capturing portion, a swing motion of the exercise appliance is analyzed on the basis of motion information acquired by the sensor portion, and at least one of the motion information and an analysis result is corrected by using the distance information. Therefore, an error of the motion information is improved, and thus a motion state of the exercise appliance can be analyzed with high accuracy. 
     Application Example 26 
     An analysis method according to this application example includes an image capturing process of capturing an image of a part of interest of an exercise appliance, the exercise appliance being attached with a sensor portion detecting motion information; an image processing process of acquiring distance information regarding a distance between the part of interest and a predetermined target object on the basis of a captured image of the part of interest; an analysis process of analyzing a swing motion of the exercise appliance on the basis of the motion information; and a correction process of correcting at least one of the motion information and an analysis result of the swing motion by using the distance information. 
     According to this method, distance information between the part of interest and the predetermined target object is acquired on the basis of a captured image of the part of interest obtained by the image capturing portion, a swing motion of the exercise appliance is analyzed on the basis of motion information acquired by the sensor portion, and at least one of the motion information and an analysis result is corrected by using the distance information. Therefore, an error of the motion information is improved, and thus a motion state of the exercise appliance can be analyzed with high accuracy. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a block diagram schematically illustrating a sensor unit of a motion detection apparatus according to Embodiment 1 of the invention. 
         FIG. 2  is a block diagram schematically illustrating an analysis unit of the motion detection apparatus according to Embodiment 1. 
         FIG. 3A  is a schematic diagram in which the motion detection apparatus according to Embodiment 1 is applied to a golf club. 
         FIG. 3B  is a schematic diagram in which the motion detection apparatus according to Embodiment 1 is applied to the golf club. 
         FIG. 3C  is a schematic diagram in which the motion detection apparatus according to Embodiment 1 is applied to the golf club. 
         FIG. 4  is a schematic diagram illustrating a relationship between the golf club to which the motion detection apparatus according to Embodiment 1 is applied and a subject. 
         FIG. 5  is a flowchart illustrating a flow of a process in a motion analysis method. 
         FIG. 6  is a diagram illustrating an example of an evaluation index for determining a standing still state. 
         FIG. 7  is a schematic diagram in which a motion detection apparatus according to Embodiment 2 of the invention is applied to a golf club. 
         FIG. 8  is a block diagram schematically illustrating the motion detection apparatus according to Embodiment 2. 
         FIG. 9A  is a diagram for explaining correction of a head position when a swing is started and a golf ball is hit in a motion detection apparatus according to Embodiment 3 of the invention. 
         FIG. 9B  is a diagram for explaining correction of a head position when a swing is started and a golf ball is hit in the motion detection apparatus according to Embodiment 3 of the invention. 
         FIG. 10A  is a diagram for explaining adjustment of a position of a sensor unit attached to a golf club in Embodiment 3 of the invention. 
         FIG. 10B  is a diagram for explaining adjustment of a position of the sensor unit attached to the golf club in Embodiment 3. 
         FIG. 10C  is a diagram for explaining adjustment of a position of the sensor unit attached to the golf club in Embodiment 3. 
         FIG. 11  is a diagram schematically illustrating a sensor unit according to Embodiment 4 of the invention. 
         FIG. 12A  is a diagram for explaining adjustment of a position of a sensor unit attached to a golf club in Embodiment 4. 
         FIG. 12B  is a diagram for explaining adjustment of a position of the sensor unit attached to the golf club in Embodiment 4. 
         FIG. 13  is a block diagram schematically illustrating a motion detection apparatus according to Embodiment 5 of the invention. 
         FIG. 14  is a block diagram illustrating details of a processing section of an analysis unit according to Embodiment 5. 
         FIG. 15  is a block diagram illustrating details of a storage section of the analysis unit. 
         FIG. 16A  is a diagram for explaining correction of a head position when a swing is started. 
         FIG. 16B  is a diagram for explaining correction of a head position when a golf ball is hit. 
         FIG. 17  is a flowchart illustrating a flow of a process in a motion analysis method. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, embodiments of the invention will be described with reference to the drawings. In the following respective drawings, a dimension or a scale of each constituent element may be illustrated to be different from that of an actual constituent element so that a size of each constituent element can be recognized in the drawings. 
     Embodiment 1 
     A motion detection apparatus  1  including a sensor unit  10  according to Embodiment 1 is an apparatus detecting motion of a subject M as illustrated in  FIG. 4 , and uses, for motion analysis, a motion form of the subject M, such as a swing trajectory of an exercise appliance, for example, a golf club  500  as illustrated in  FIG. 3B , a tennis racket, or a baseball bat. The motion detection apparatus  1  corresponds to a motion detection system. 
     Hereinafter, a description will be made of a case where the motion detection apparatus  1  is applied to the golf club  500  as an example of the embodiment. 
       FIG. 1  is a block diagram schematically illustrating the motion detection apparatus  1  according to Embodiment 1, and is a schematic diagram mainly illustrating a sensor section  100  of the sensor unit  10 .  FIG. 2  is a block diagram schematically illustrating the motion detection apparatus  1  according to the present embodiment, and is a schematic diagram mainly illustrating an analysis unit  50 .  FIGS. 3A to 3C  are schematic diagrams illustrating an example in which the motion detection apparatus  1  is applied to the golf club  500 , and do not illustrate the analysis unit  50 .  FIG. 4  is a schematic diagram illustrating a relationship with the subject M in a case where the motion detection apparatus  1  is applied to the golf club  500 .  FIG. 5  is a flowchart illustrating a flow of a process in a motion analysis method using of the motion detection apparatus  1 .  FIG. 6  is a diagram illustrating an example of an evaluation index for determining a standing still state. 
     [Configuration of Motion Detection Apparatus  1 ] 
     The motion detection apparatus  1  illustrated in  FIG. 1  to  FIGS. 3A to 3C  is configured to include the sensor unit  10  and the analysis unit  50 . 
     &lt;Configuration of Sensor Unit  10 &gt; 
     The sensor unit  10  is configured to include the sensor section  100 , a casing  130  accommodating the sensor section  100 , and a holder  200 . 
     &lt;Configuration of Sensor Section  100 &gt; 
     The sensor section  100  is configured to include a notification portion  30 , a sensor  110 , an imaging portion  150 , and a controller  120 , and these constituent elements are provided in the same casing  130 . 
     &lt;Sensor  110 &gt; 
     The sensor  110  can detect predetermined physical quantities associated with motion, and can output signals corresponding to detected physical quantities such as an acceleration, an angular velocity, a velocity, and an angular acceleration. 
     The sensor  110  is provided with three-axis detection type acceleration sensors  112   x,    112   y  and  112   z  (hereinafter, collectively referred to as “three-axis acceleration sensors”) detecting accelerations in X axis, Y axis and Z axis directions. The sensor  110  is provided with three-axis detection type gyro sensors (angular velocity sensors)  114   x ,  114   y  and  114   z  (hereinafter, collectively referred to as “three-axis gyro sensors”) detecting angular velocities in the X axis, Y axis and Z axis directions. The sensor  110  is provided as a six-axis detection type motion sensor including the three-axis acceleration sensors and the three-axis gyro sensors. 
     Here, each of the three-axis gyro sensors (angular velocity sensors)  114   x  to  114   z  may employ a vibration type angular velocity sensor. The vibration type angular velocity sensor causes a vibrator to vibrate at a constant frequency. If an angular velocity is applied to the vibrator, a Coriolis force is generated, and the vibrator vibrates in different directions due to the Coriolis force. If a displacement caused by the Coriolis force is detected, the angular velocity is detected, and thus it is possible to detect a physical quantity associated with motion. 
     In the motion detection apparatus  1  of the present embodiment, a configuration of the sensor  110  is not particularly limited, and may be changed as appropriate according to a measurement target object whose motion is detected. 
     &lt;Imaging Portion  150 &gt; 
     The imaging portion  150  corresponds to an image capturing portion, captures an image of a subject, and outputs captured image data to the controller  120 . In Embodiment 1, the imaging portion  150  is assumed to be a digital camera including an imaging element which outputs an electric signal according to an image picture formed by an optical component. In Embodiment 1, as illustrated in  FIG. 3A , the imaging portion  150  is accommodated on a first side surface side of the casing  130 . In other words, as illustrated in  FIG. 3B , in a case where the motion detection apparatus  1  is applied to the golf club  500 , the imaging portion  150  is attached to the casing  130  so as to image the vicinity of a head  500   h  of the golf club  500 . 
     &lt;Controller  120 &gt; 
     The controller  120  is configured to include a data processing portion  120 A, a power source portion  120 B, and a communication portion  120 C. The controller  120  is connected to the sensors  112   x  to  112   z  and  114   x  to  114   z,  the imaging portion  150 , the notification portion  30 , and the analysis unit  50 . 
     The data processing portion  120 A performs packet data conversion on an output signal from each of the sensors  112   x  to  112   z  and  114   x  to  114   z  into packet data along with, for example, time information (time base). 
     The data processing portion  120 A transmits the signal having undergone the packet data conversion to the communication portion  120 C. 
     The data processing portion  120 A performs packet data conversion on an image signal for an image captured by the imaging portion  150  along with time information (time base). The data processing portion  120 A transmits the image signal having undergone the packet data conversion to the communication portion  120 C. 
     In the following description, a signal obtained by converting each of an output signal from each of the sensors  112   x  to  112   z  and  114   x  to  114   z  and an image signal from the imaging portion  150  into packet data is referred to as a “motion signal  70 ”. 
     The communication portion  120 C performs a process of transmitting the motion signal  70  (packet data) transmitted from the data processing portion  120 A to the analysis unit  50 . A transmission method between the sensor unit  10  and the analysis unit  50  is not particularly limited, and may use wireless communication such as WiFi (registered trademark). 
     The controller  120  is provided with the power source portion  120 B, and supplies power which is required for operations of the sensor  110 , the imaging portion  150 , the controller  120 , and the like. A configuration of the power source portion  120 B is not particularly limited, and a primary battery (for example, a dry battery or a lithium battery) or a secondary battery (a nickel hydrogen battery or a lithium ion battery) may be used. The power source portion  120 B may be provided in the analysis unit  50  so as to supply power to the sensor section  100 . 
     &lt;Configuration of Holder  200 &gt; 
     The holder  200  is an attachment which attaches the sensor section  100  to an exercise appliance in order to detect a swing trajectory of the exercise appliance which is a detection target of the motion detection apparatus  1 . 
     As illustrated in  FIG. 3B , in a case where the motion detection apparatus  1  is applied to the golf club  500 , the holder  200  is an attachment which attaches the sensor section  100  to an exercise appliance such as the golf club  500 . A shape of the holder  200  is not particularly limited, but, in a case where the motion detection apparatus is applied to the golf club  500 , the holder maybe attached so that the sensor section  100  is provided on a shaft  500   s  or a grip  500   g  and the sensor section  100  is attachable to and detachable from the holder. The sensor section  100  is preferably attached to the golf club  500  so that the notification portion  30  which will be described later is directed in the same direction of an end of the grip  500   g.  The holder  200  may be changed as appropriate according to the type of exercise appliance. 
     &lt;Configuration of Notification Portion  30 &gt; 
     The notification portion  30  is provided in the sensor section  100  as illustrated in  FIGS. 1 and 2 . The notification portion  30  is configured to include a light emitter  132  as illustrated in  FIGS. 3A to 3C . The notification portion  30  is provided to visually notify the subject M of a state of an output signal from the sensor section  100  or various states of the motion detection apparatus  1 . The notification portion  30  notifies the subject M of a state of an output signal from the sensor section  100  or various states of the motion detection apparatus  1  through blinking of the light emitter  132 . The notification portion  30  of the motion detection apparatus  1  of Embodiment 1 is configured to include, as an example, a first light emitter  132   a  and a second light emitter  132   b.  The first light emitter  132   a  and the second light emitter  132   b  can emit light with a plurality of colors (for example, red and green) by using light emitting elements such as light emitting diodes. Therefore, the notification portion  30  may notify the subject of a state of the motion signal  70  or various states detected by the motion detection apparatus  1  depending on a difference between light emission colors of the light emitter  132 . 
     The notification portion  30  is preferably provided on a second side surface opposing the first side surface of the casing  130  of the sensor section  100 , that is, an upper surface side in a case of being attached to the golf club  500 . 
     For example, in a case where the sensor unit  10  is attached to a backside of the shaft  500   s  of the golf club  500  which will be described later, if the notification portion  30  is provided on only the surface of the casing  130 , the subject M may be hindered from visually recognizing (perceiving) light emission of the notification portion  30 . Therefore, the notification portion  30  is provided on another side surface of the casing  130 , and thus the subject M can visually recognize (perceive) light emission of the notification portion  30  regardless of an attachment method of the sensor unit  10 . The notification portion  30  is preferably provided at both ends of the casing  130  of the sensor unit  10  in a width direction (for example, a direction intersecting a direction in which the shaft  500   s  extends). The subject can visually recognize (perceive) light emission of the notification portion  30  regardless of a dominant arm in a swing of the golf club  500 . 
     &lt;Configuration of Analysis Unit  50 &gt; 
     Referring to  FIG. 2  again, a configuration of the analysis unit  50  will be described. 
     As illustrated in  FIG. 2 , the analysis unit  50  is configured to include a processing section (CPU)  201 , a communication section  210 , an operation section  220 , a ROM  230 , a RAM  240 , a nonvolatile memory  250 , and a display section  260 . 
     The communication section  210  performs a process of receiving the motion signal  70  (packet data) transmitted from the sensor unit  10 , and transmitting the motion signal to the processing section  201 . The operation section  220  performs a process of acquiring operation data from the subject M or an assistant (not illustrated), and transmitting the operation data to the processing section  201 . The ROM  230  stores programs for the processing section  201  performing various computation processes or control processes, or various programs or data, etc., for realizing application functions. 
     The RAM  240  is a storage section which is used as a work region of the processing section  201 , and temporarily stores a program or data read from the ROM  230 , data which is input from the operation section  220 , results of calculation which is performed by the processing section  201  according to various programs or application functions, and the like. 
     The display section  260  displays a process result in the processing section  201  as text, a graph, or other images. The display section  260  is, for example, a CRT, an LCD, and a touch panel display. A single touch panel display may realize functions of the operation section  220  and the display section  260 . 
     The processing section  201  is configured to include a calculation portion  202 , a determination portion  204 , and an analysis portion  206 . The processing section  201  performs various processes such as a computation process, an analysis process, and a determination process on the motion signal  70  which is received from the sensor unit  10  via the communication section  210  according to the program stored in the ROM  230 . 
     In the processing section  201 , the calculation portion  202  performs a calculation process on the motion signal  70  transmitted from the sensor unit  10 . The determination portion  204  determines whether or not the subject M is in a standing still state, that is, the golf club  500  attached with the sensor unit  10  is in a swing origin state on the basis of a result of the calculation process. The determination portion  204  stores a bias value in the RAM  240  in a case where the standing still state is determined. 
     In Embodiment 1, it is assumed that the standing still state is determined on the basis of an image signal included in the motion signal  70 , but a determination of the standing still state based on a calculation result of an output signal which is output from the sensor  110  may also be performed in addition to the determination based on the image signal. For example, in a case where the golf club  500  is moved at a higher speed than a predetermined reference, the standing still state is determined on the basis of a calculation result of an output signal from the sensor  110 , and, in a case where the speed of the golf club  500  transitions to a low speed, the standing still state maybe determined on the basis of an image signal. There maybe an aspect in which a user such as the subject M can select a determination method. 
     The calculation portion  202  performs a calculation process on the motion signal  70  transmitted from the sensor unit  10 . The analysis portion  206  performs motion analysis on a measurement target on the basis of a result of the calculation process. The determination portion  204  performs a determination of whether or not motion is detected or a determination of completion of a motion analysis result on the basis of the motion analysis result, and the like. 
     The processing section  201  transmits a trigger (result) signal  80  regarding a determination of a standing still state, a determination of whether or not motion is detected, and completion of a motion analysis result, to the sensor unit  10 , and transmits the trigger signal to the notification portion  30 . 
     The analysis unit  50  may employ a personal computer, a high function mobile phone (smart phone), a multi-function portable terminal (tablet terminal) or the like having the above-described functions. 
     &lt;Aspect in Which Motion Detection Apparatus  1  is Applied to Golf Club  500 &gt; 
     A description will be made of an aspect in which the above-described motion detection apparatus  1  is applied to the golf club  500 . 
       FIG. 3A  is a schematic diagram illustrating an exterior of the sensor section  100  forming the sensor unit  10 . In the sensor section  100 , the sensor  110  and the controller  120  forming the sensor section  100  are accommodated in the casing  130 . The first light emitter  132   a  and the second light emitter  132   b  forming the notification portion  30  are provided on the second side surface of the casing  130 . 
       FIGS. 3B and 3C  are diagrams illustrating a state in which the sensor unit  10  is attached to the golf club  500  as an example of an embodiment of the motion detection apparatus  1 . As illustrated in  FIG. 3B , the sensor section  100  is attached to the golf club  500  by using the holder  200 . Specifically, as illustrated in  FIG. 3C , the sensor section  100  is attached to be fitted to the holder  200  attached to the shaft  500   s  or the grip  500   g  of the golf club  500 . The sensor unit  10  is attached to the golf club  500  so that the light emitter  132  ( 132   a  and  132   b ) of the notification portion  30  is directed toward the end side of the grip  500   g.  This is so that the subject M can easily visually recognize (perceive) light emission. 
       FIG. 4  schematically illustrates a situation in which the subject M holds the golf club  500 . 
     As illustrated in  FIG. 4 , in a case where the motion detection apparatus  1  detects a swing motion of the golf club  500  performed by the subject M, and analyzes the swing according to a motion analysis method which will be described later, the subject M can perceive a state of the motion detection apparatus  1  by visually recognizing light emission of the notification portion  30 . Therefore, the subject M can perform a swing without averting a visual line e. 
     If the casing  130  of the sensor section  100  enters a visual field of the subject M, a swing which is different from a normal swing may be performed since the subject is concerned about the casing during a swing. Therefore, the casing  130  of the sensor section  100  is preferably attached to the backside of the shaft  500   s  when viewed from the subject M in a standing still state (at address) before swinging the golf club  500 . In this case, as described above, the notification portion  30  is provided on another side surface of the casing  130  of the sensor section  100 , and thus the subject M can easily visually recognize (perceive) whether or not the notification portion  30  emits light. 
     In a case where the casing  130  is attached to the backside of the shaft  500   s,  the imaging portion  150  is set to image a part of interest in the vicinity of the head  500   h  of the golf club  500 , specifically, the vicinity of a face which is a ball hitting portion hitting a golf ball (not illustrated) through a swing motion. 
     There may be an aspect in which an imaging direction of the imaging portion  150  can be changed through an operation of the subject M. For example, there maybe an aspect in which an imaging direction is set to a target line direction, a place where a swing is performed is imaged, and a captured landscape image is linked with swing data, and is also displayed on the display section  260  of the analysis unit  50 . Consequently, it is possible to save the time and effort to manually input place information or the like. 
     &lt;Motion Analysis Method&gt; 
     A motion analysis method of the present embodiment includes a measurement preparation process, a motion measurement process, a transmission process of transmitting the motion signal  70  obtained in the motion measurement process to the analysis unit  50 , and an analysis process of analyzing the motion signal  70  transmitted in the transmission process. The motion analysis method includes a standing still state notification process of performing a notification of completion of the measurement preparation process, a measurement completion notification process of performing a notification of completion of the motion measurement process, and a transmission completion notification process of performing a notification of completion of transmission of the motion signal  70  from the sensor unit  10  to the analysis unit  50 . 
     Each process will be described for each step with reference to a flowchart illustrated in  FIG. 5  with respect to the motion analysis method using the motion detection apparatus  1 . Regarding the description of the motion analysis method, the motion analysis method in which the motion detection apparatus  1  is applied to the golf club  500  will be described. 
     &lt;Measurement Preparation Process&gt; 
     The measurement preparation process is a process of preparing for measurement of motion, and is a process of measuring a bias of the sensor  110  before starting motion (swing). 
     Here, the bias collectively indicates a zero bias in an initial state in which angular velocity is zero before the subject M starts motion, and a drift caused by an external factor such as a power source fluctuation or a temperature change. 
     In the measurement preparation process, in step S 10 , the analysis unit  50  acquires the motion signal  70  in a case of a standing still state (so-called address state) in which the subject M holds the golf club  500  and stands still. 
     In the measurement preparation process, in step S 20 , the calculation portion  202  calculates the motion signal  70  acquired by the analysis unit  50 . 
     In the measurement preparation process, in step S 25 , an image signal is extracted from the motion signal  70  calculated by the calculation portion  202 , the extracted image signal is processed, and thus a captured image of a region including the head  500   h  of the golf club  500  and a golf ball is extracted at a predetermined time interval. In the measurement preparation process, image processing is performed on the extracted captured image so that a distance between a predetermined portion (for example, a face surface) of the head  500   h  and the golf ball is calculated, and the calculated distance information is stored in the nonvolatile memory  250 . 
     In the measurement preparation process, the distance information stored in the nonvolatile memory  250  is read, and a change in the distance information associated with a temporal change is examined as illustrated in  FIG. 6 . For example, in a case where a distance L between the face surface and the golf ball changes to L 1 , L 2 , and L 3 , if a change amount of the distance information is equal to or less than a predetermined reference value as in L 2  and L 3 , and a state in which the change amount is equal to or less than is the predetermined reference value lasts for a predetermined time (for example, 3 seconds), the determination portion  204  determines that the golf club  500  is in a standing still state. 
     In Embodiment 1, a standing still state is determined on the basis of a change in a distance between the face surface and the golf ball, but is not limited thereto. For example, in a case where a golf ball is not set, a standing still state maybe determined on the basis of a change in a distance between the face surface and a golf tee. Instead of the golf tee, a predetermined mark or the like drawn on the ground may be used. 
     In the measurement preparation process, in step S 30 , in a case where it is determined that the golf club  500  is included in the range of a standing still state (YES), the process proceeds to a notification of “standing still state detection” in step S 41 , and an output signal from the sensor  110  at that time is stored in the RAM  240  as a bias value. In a case where it is determined that the motion signal  70  is not included in the range of a standing still state in step S 30  (NO), a notification of a “standing still state detection error” is performed in step S 42 , and the process returns to step S 10  so as to be performed again from acquisition of the motion signal  70  in a standing still state. 
     Detection of a standing still state in the measurement preparation process is not limited to a method of determining a standing still state by processing an image captured by the imaging portion  150 , and there may be an aspect of analyzing an output signal from the sensor  110 . In this case, in the measurement preparation process, the calculation portion  202  calculates the motion signal  70  acquired by the analysis unit in step S 20 , the motion signal  70  calculated by the calculation portion  202  is compared with a value of the motion signal  70  in a standing still state, which is a first threshold value recorded in the ROM  230  in advance in step S 30 , and the determination portion  204  performs a first determination of whether or not the motion signal  70  is lower than the value thereof in a standing still state, which is the first threshold value in a predetermined period. 
     The predetermined period for a determination is set as appropriate depending on a measurement target, and the period in the present embodiment is 3 seconds. In a case where it is determined that the motion signal  70  is included in the range of a standing still state in step S 30  (YES), the process proceeds to a notification of “standing still state detection” in step S 41 , and the motion signal  70  at that time is stored in the RAM  240  as a bias value. 
     &lt;Standing Still State Notification Process&gt; 
     The standing still state notification process is a process of performing a notification of a determination result of whether or not the golf club  500  and the subject M holding the golf club  500  are in a standing still (address) state on the basis of the motion signal  70  in the above-described measurement preparation process. 
     In the standing still state notification process, in a case where it is determined that the golf club  500  and the subject M holding the golf club  500  are in a standing still state on the basis of the motion signal  70  in step S 30 , a notification of “standing still state detection” is performed in step S 41 . The notification is also a notification that the measurement target has started motion. 
     In the standing still state notification process, in a case where it is determined that the golf club  500  and the subject M holding the golf club  500  are not in a standing still state on the basis of the motion signal  70  in step S 30 , a notification of a “standing still state detection error” is performed in step S 42 . 
     The standing still state notification process is performed by the light emitter  132  provided in the notification portion  30 . Here, the notification of standing still state detection in the notification portion  30  is performed by using blinking and light emission colors of the first light emitter  132   a  and the second light emitter  132   b.  The notification portion  30  may change a light emission color and a blinking pattern according to information notified by the subject M. 
     The notification of “standing still state detection” in step S 41  is performed by using a light emission color and a notification (blinking) pattern of the light emitter  132 . A light emission color and a notification pattern corresponding to “standing still state detection” are set in advance. 
     The notification of “standing still state detection error” in step S 42  is performed through light emission of the light emitter  132  so as to be different from the notification of “standing still state detection”. A light emission color and a notification pattern corresponding to “standing still state detection error” are set in advance. Consequently, the subject M is notified of “standing still state detection error” and is also prompted to maintain a standing still (address) state. 
     &lt;Motion Measurement Process&gt; 
     The motion measurement process is a process of measuring motion (swing) of the subject M holding the golf club  500 . The motion measurement process is a process in which the sensor  110  mounted in the sensor unit  10  measures motion (swing) of the subject M. 
     In the motion measurement process, in step S 50 , an acceleration or the like associated with the motion of the subject M is acquired from the sensor unit  10  as the motion signal  70 . 
     &lt;Transmission Process&gt; 
     The transmission process is a process of transmitting, to the analysis unit  50 , the motion signal  70  which is acquired in the motion measurement process and is based on the motion (swing) of the subject M holding the golf club  500 . 
     In the transmission process, the motion signal  70  acquired in step S 50  is transmitted from the sensor unit  10  to the analysis unit  50 . 
     In the transmission process, in step S 70 , the determination portion  204  performs a second determination of whether or not an error (for example, an over-range or missing) is included in the motion signal  70  transmitted to the analysis unit  50  in step S 60 . In the transmission process, in step S 70 , the determination portion  204  performs the second determination of whether or not the acceleration or the like associated with the motion exceeds a preset value on the basis of the motion signal  70  transmitted to the analysis unit  50  in step S 60 . 
     The error determination is performed through comparison with the normal motion signal  70  recorded in the ROM  230  in advance as a second threshold value. The determination of the acceleration or the like associated with the motion is performed through comparison with the motion signal  70  recorded in the ROM  230  in advance as the second threshold value. The determination of the acceleration or the like associated with the motion may be performed by using any value of the motion signal  70  such as the maximum value or the minimum value of the motion signal  70  of the subject M as the second threshold value. 
     In a case where it is determined that an error is not included in the motion signal  70  in step S 70 , or the motion signal  70  exceeds the preset second threshold value (satisfies the condition of the threshold value) (YES), the process proceeds to a notification of “favorable measurement” in step S 81 . In a case where it is determined that an error is included in the motion signal  70  in step S 70  (NO), the process proceeds to a notification of “measurement error” in step S 82 , and also returns to step S 10  so that motion analysis is performed again from acquisition of the motion signal  70  in a standing still state. 
     The notification of “favorable measurement” in step S 81  is performed by using a light emission color and a notification (blinking) pattern of the light emitter  132 . A light emission color and a notification pattern corresponding to “favorable measurement” are set in advance. 
     The notification of “measurement error” in step S 82  is performed by using a light emission color and a notification (blinking) pattern of the light emitter  132 . A light emission color and a notification pattern corresponding to “measurement error” are set in advance. Consequently, the subject M is notified of “measurement error”, and it is also prompted that motion analysis is performed again from acquisition of the motion signal  70  in a standing still state in step S 10 . 
     In the transmission process, in step S 90 , the determination portion  204  determines whether or not transmission of the motion signal  70  transmitted to the analysis unit  50  in step S 60  is completed. The determination of transmission completion is performed by receiving start parity and end parity which are added to the motion signal  70  (packet data) to be transmitted, by the data processing portion  120 A of the sensor unit  10 . In a case where the end parity is received until a predetermined time stored in the ROM  230  in advance elapses after the start parity is received in step S 90 , transmission completion is determined, and thus the process proceeds to a notification of “transmission completion” in step S 101 . In a case where the end parity is not received until the predetermined time elapses, the process proceeds to a notification of “transmission error” in step S 102 , and also returns to step S 10  so that motion analysis is performed again from acquisition of the motion signal  70  in a standing still state. 
     The notification of “transmission completion” in step S 101  is performed by using a light emission color and a notification (blinking) pattern. A light emission color and a notification pattern corresponding to “transmission completion” are set in advance. Consequently, the subject M is notified of “transmission completion”. 
     The notification of “transmission error” in step S 102  is performed by using a light emission color and a notification pattern corresponding to “transmission error” and set in advance. Consequently, the subject M is notified of “transmission error”, and it is also prompted that motion analysis is performed again from acquisition of the motion signal  70  in a standing still state in step S 10 . 
     &lt;Analysis Process&gt; 
     The analysis process is a process of analyzing the motion signal  70  transmitted to the analysis unit  50 , acquired in the motion measurement process, and based on the motion (swing) of the subject M holding the golf club  500 . 
     In the analysis process, the motion signal  70  transmitted to the analysis unit  50  in step S 110  and based on the motion (swing) of the subject M, is analyzed according to a predetermined analysis program stored in the ROM  230 . In the analysis process, an analysis result is displayed (output) on the display section  260 . 
     A technique of analyzing a swing on the basis of output signals from the sensor  110 , included in the motion signal  70 , may employ a technique disclosed in a patent publication (for example, JP-A-2014-90773). 
     In the analysis process, in step S 120 , the determination portion  204  determines the analysis result in step S 110 . The determination of the analysis result is performed on the basis of an analysis result stored in the ROM  230  in advance. 
     In the analysis process, in step S 120 , the determination portion  204  compares the analysis result of the motion signal  70  analyzed in step S 110  with an analysis result (hereinafter, referred to as a “standard analysis result”) within a predetermined range recorded in the ROM  230  in advance, so as to determine whether or not the analysis result is included in the range of the standard analysis result. 
     In a case where it is determined that the analysis result is included in the range of the standard analysis result in step S 120  (YES), the process proceeds to a notification of “analysis completion” in step S 131 . In a case where it is determined that the analysis result is not included in the range of the standard analysis result in step S 120  (NO), the process proceeds to a notification of “analysis error” in step S 132 , and also returns to step S 10  so that motion analysis is performed again from acquisition of the motion signal  70  in a standing still state. 
     The notification of “analysis completion” in step S 131  is performed by using a light emission color and a notification (blinking) pattern. A light emission color and a notification pattern corresponding to “analysis completion” are set in advance. Consequently, the subject M is notified of “analysis completion”. 
     The notification of “analysis error” in step S 132  is performed by using a light emission color and a notification (blinking) pattern. A light emission color and a notification pattern corresponding to “analysis error” are set in advance. Consequently, the subject M is notified of “analysis error”. Consequently, the subject M is notified of “analysis error”, and it is also prompted that motion analysis is performed again from acquisition of the motion signal  70  in a standing still state in step S 10 . 
     In the motion analysis method, a series of processes are finished when the notification of “analysis completion” in step S 131  is performed. 
     In the above-described motion analysis method, the respective steps after the notification of “standing still state detection” in step S 41  are continuously performed. In the above-described motion analysis method, the notifications in the respective steps after the notification of “standing still state detection” in step S 41  may be omitted or added as appropriate. 
     According to Embodiment 1, the following effects are achieved. 
     According to the motion detection apparatus  1 , the subject M holding an exercise appliance can visually perceive a state of the motion detection apparatus  1  through light emission of the notification portion  30  without changing an attitude of the subject. 
     Therefore, in the motion detection apparatus  1 , the subject M can perform motion (swing) while holding the exercise appliance without averting the visual line e or lacking attention. Thus, it is possible to detect a natural motion (swing) attitude and thus to increase reliability of motion analysis. 
     Embodiment 2 
     Next, a description will be made of Embodiment 2 of the invention with reference to  FIGS. 7 and 8 . In the following description, the same part as the part having already been described is given the same reference numeral, and a description thereof will be omitted. 
       FIG. 7  is a schematic diagram illustrating an example in which the motion detection apparatus  1  according to Embodiment 2 is applied to the golf club  500 , and  FIG. 8  is a block diagram schematically illustrating the motion detection apparatus  1  according to Embodiment 2. 
     Embodiment 1 employs an aspect in which the imaging portion  150  is integrally incorporated into the casing  130 , but Embodiment 2 employs an aspect in which the imaging portion  150  is separate from the casing  130  without being incorporated thereinto, and is attached to the shaft  500   s  of the golf club  500 . In other words, as illustrated in  FIG. 7 , the imaging portion is attached to the part closer to the head  500   h  than the casing  130  in the shaft  500   s  of the golf club  500  by using a holder  160 . In this case, if a casing  152  of a camera  156  is attached to the holder  160 , a lens portion  154  of the camera  156  is directed toward the head  500   h  and can thus image the head  500   h  and a golf ball in detail. 
     As illustrated in  FIG. 8 , the imaging portion  150  includes a communication device  158 , the camera  156 , and a controller  157  controlling functions of the communication device  158  and the camera  156 . 
     The communication device  158  can perform short-range radio communication with the communication portion  120 C. In this case, a transmission method is not particularly limited, and may employ a protocol of a short-range radio communication standard such as Bluetooth (registered trademark). 
     According to the above-described Embodiment 2, it is possible to calculate a distance between the face surface of the golf club  500  and a golf ball with high accuracy, and thus to detect a standing still state in detail, in addition to the effects described in Embodiment 1. 
     Embodiment 3 
     &lt;Correction of Position of Head  500   h&gt;   
       FIGS. 9A and 9B  are diagrams for explaining correction of a position of the head  500   h  when a swing is started and a golf ball is hit in a motion detection apparatus according to Embodiment 3 of the invention. 
     A description will be made of a motion detection apparatus and a detection system according to the present embodiment with reference to the drawings. The same constituent elements as in the above-described embodiments are given the same reference numerals, and repeated description will be omitted. 
       FIG. 9A  illustrates trajectories (trajectories of the head  500   h  and the grip  500   g ) of the golf club  500  drawn by using a position of the head  500   h  before being corrected, obtained through computation, and  FIG. 9B  illustrates trajectories of the golf club  500  drawn by using a position of the head  500   h  after being corrected. In Embodiment 1, an XYZ coordinate system (global coordinate system) having a target line indicating a target hit ball direction as an X axis, an axis on a horizontal plane perpendicular to the X axis as a Y axis, and a vertically upward direction (a direction opposite to the gravitational direction) as a Z axis is defined, and  FIGS. 9A and 9B  illustrate the X axis, the Y axis, and the Z axis. 
     In  FIGS. 9A and 9B , the reference signs S 1 , HP 1 , and GP 1  respectively indicate positions of the shaft  500   s,  the head  500   h,  and the grip  500   g  during swing starting, and the reference signs S 2 , HP 2 , and GP 2  respectively indicate positions of the shaft  500   s,  the head  500   h,  and the grip  500   g  at impact. 
     In  FIGS. 9A and 9B , the position HP 1  of the head  500   h  during swing starting matches the origin (0,0,0) of the XYZ coordinate system. A dashed line HL 1  and a solid line HL 2  respectively indicate trajectories of the head  500   h  during a backswing and a downswing, and a dashed line GL 1  and a solid line GL 2  respectively indicate trajectories of the grip  500   g  during a backswing and a downswing. A connection point between the dashed line HL 1  and the solid line HL 2  and a connection point between the dashed line GL 1  and the solid line GL 2  respectively correspond to a position of the head  500   h  and a position of the grip  500   g  at a top of the swing (when a swing direction is changed). 
     Since the head  500   h  is located slight in front of a ball during swing starting, and comes into contact with the ball at impact, positions of the head  500   h  during swing starting and at impact may be substantially the same as each other in an actual swing. However, as illustrated in  FIG. 9A , the position HP 2  of the head  500   h  at impact, obtained through computation, is located at a position slightly deviated from the position HP 1  of the head  500   h  during swing starting due to the influence of an integration error or the like of an acceleration or an angular velocity. In other words, the trajectory illustrated in  FIG. 9A  is slightly different from a trajectory of an actual swing. 
     Therefore, for example, if a position of the head  500   h  at one of the time of swing starting and the time of impact is corrected to match the other position under the premise that positions of the head  500   h  during swing starting and at impact are substantially the same as each other in an actual swing in  FIG. 9A , as illustrated in  FIG. 9B , the positions of the head  500   h  during swing starting and at impact are the same as each other, and thus trajectories closer to the actual swing than the trajectories illustrated in  FIG. 9A  can be obtained. If a position of the head  500   h  right before impact is used, it is possible to correct an error with higher accuracy than in the above description. 
     &lt;Detailed Attachment Method of Sensor Section  100 &gt; 
     In a case where the above-described motion analysis process or correction of a position of the head  500   h  is performed, a calculation process is performed on the premise that a target line expressed by the X axis matches a normal direction of the head  500   h.  However, even in a case where a direction of a reference mark  190  engraved on the holder  200  is substantially matched with a direction of the head  500   h  of the golf club  500 , a fine deviation occurs between the target line and the normal direction of the head  500   h.  Therefore, the deviation is corrected in detail, and thus it is possible to perform motion analysis or position correction with higher accuracy. 
       FIGS. 10A to 10C  are diagrams illustrating a method of adjusting a target line and a normal direction of the head  500   h  in detail on the basis of an image signal obtained through imaging in the imaging portion  150 . In other words, the processing section  201  of the analysis unit  50  extracts an image signal obtained through imaging in the imaging portion  150  from the motion signal  70 . The calculation portion  202  performs image processing on the basis of the extracted image signal, so as to extract an image of a marker of the head  500   h  of the golf club  500 , corresponding to a predetermined reference image. 
     The analysis portion  206  determines a normal direction PX to a face  500   f  on the basis of the marker image, and calculates an angle R formed between a target line direction (X direction) recognized by the sensor section  100  and the normal direction PX. In a case where a mark  500   m  is engraved on the head  500   h , the mark  500   m  may be used as the marker. 
     In a case where the mark  500   m  or the like is not engraved on the head  500   h,  the calculation portion  202  may perform image processing on the basis of the extracted image signal by using the head  500   h  of the golf club  500  as a marker, so as to extract the face  500   f.  In this case, the analysis portion  206  calculates the angle R formed between a target line direction (X direction) recognized by the sensor section  100  and the normal direction PX to the face  500   f  of the golf club  500 . 
     The processing section  201  transmits notification information to the notification portion  30  according to a difference between the calculated angles. The notification portion  30  notifies a user of a direction of deviation between the target line and the normal direction of the head  500   h  and the extent of deviation on the basis of the notification information. 
     For example,  FIG. 10A  illustrates that an angle R 1  is formed between the target line direction and the normal direction PX in one direction, that is, an attachment angle of the holder  200  is deviated by almost the angle R 1 .  FIG. 10B  illustrates that the target line direction substantially matches the normal direction PX, that is, the holder  200  is accurately mounted.  FIG. 10C  illustrates that an angle R 2  is formed between the target line direction and the normal direction PX in the other direction opposite to one direction, that is, an attachment angle of the holder  200  is deviated by almost the angle R 2 . 
     In any case of  FIGS. 10A to 10C , the light emitter  132  notifies the user by changing a light emitting part in accordance with a deviation direction of an attachment angle and the extent of deviation. 
     According to Embodiment 3, the following effects are achieved. 
     In a case where the sensor section  100  is attached to the golf club  500  via the holder  200 , the notification portion  30  can guide a state of positioning. Therefore, the user can easily attach the sensor section  100  to the golf club  500  with high accuracy in accordance with the guide of the notification portion  30 . Consequently, it is possible to increase reliability of motion analysis for a swing, performed by the motion detection apparatus  1 . 
     Embodiment 4 
     Next, Embodiment 4 of the invention will be described with reference to  FIGS. 11, 12A and 12B .  FIG. 11  is a schematic diagram illustrating the sensor unit  10 , and  FIGS. 12A and 12B  are diagrams for explaining adjustment of a position of the sensor unit  10  attached to the golf club  500 . In the following description, the same part as the part having already been described is given the same reference numeral, and a description thereof will be omitted. 
     In Embodiment 4, the sensor section  100  is configured to further include a projection portion  153 . The projection portion  153  is driven in a state in which the holder  200  is attached to the golf club  500 , and the sensor section  100  is mounted in the holder  200 . 
     The projection portion  153  projects a pattern image  155  indicating a target line direction recognized by the sensor section  100  onto an upper surface of the head  500   h,  that is, the same surface as the surface on which the mark  500   m  is engraved. In Embodiment 4, the pattern image  155  employs a cross-line image indicating a target line direction and an orthogonal direction which is orthogonal thereto, but is not limited thereto. For example, the pattern image  155  may be a line image generated by a laser light source. 
     The user visually recognizes the pattern image  155  projected onto the upper surface of the head  500   h,  and adjusts the holder  200  so that the orthogonal direction of the pattern image  155  is parallel to the surface direction of the face  500   f.    
     According to the above-described Embodiment 4, since a light emission state of the light emitter  132  is not required to be visually recognized when attachment of the golf club  500  and the holder  200  is adjusted, the adjustment work is easily performed, in addition to the same effects as in Embodiment 3. 
     The embodiments of the invention have been described with reference to the drawings, but a specific configuration is not limited to the embodiments, and design change and the like may occur within the scope without departing from the spirit of the invention. For example, the notification portion  30  performs a notification by using light blinking of the light emitter  132 , but is not limited thereto. For example, a notification may be assumed to be performed by using a sound or vibration. There may be an aspect by using display on the display section  260  of the analysis unit  50 . 
     Instead of adjustment of turning the holder  200  in accordance with the normal direction PX to the face  500   f  of the golf club  500 , there maybe an aspect of an analysis program for analyzing motion on the basis of the angle R formed between the target line direction (X direction) and the normal direction PX, or an aspect of performing a correction process in a process of correcting a position of the head  500   h.    
     An apparatus performing the above-described technique maybe implemented by a single apparatus, and may be implemented by a combination of a plurality of apparatuses, and thus various aspects may occur. For example, there maybe an aspect in which the analysis processing function of the analysis unit  50  is realized by only the sensor unit  10 . 
     Embodiment 5 
       FIG. 13  is a block diagram schematically illustrating a motion detection apparatus  1 ′ according to Embodiment 5, and is a diagram illustrating a relationship between the sensor unit  10  and an analysis unit  50 ′. 
       FIG. 14  is a block diagram illustrating details of the processing section  201  of the analysis unit  50 ′, and  FIG. 15  is a block diagram illustrating details of a storage section  350  of the analysis unit  50 ′. 
       FIGS. 16A and 16B  are diagrams schematically illustrating the sensor unit  10  of the motion detection apparatus  1 ′.  FIG. 16A  is a diagram illustrating a trajectory of the golf club  500  before being corrected, and  FIG. 16B  is a diagram illustrating a trajectory of the golf club  500  after being corrected.  FIG. 17  is a flowchart illustrating a flow of a process in the motion analysis method. 
     Hereinafter, a description will be made of an analysis system according to the present embodiment, a recording medium recording the analysis program, and an analysis method with reference to the drawings. The same constituent elements as in the above-described embodiments are given the same reference numerals, and repeated description will be omitted. 
     As illustrated in  FIG. 13 , the motion detection apparatus  1 ′ is configured to include the sensor unit  10  and the analysis unit  50 ′. 
     The sensor unit  10  is configured to include a sensor section  100 , a casing  130  accommodating the sensor section  100 , and a holder  200 . 
     The sensor section  100  is configured to include a notification portion  30 , a sensor  110 , an imaging portion  150 , and a controller  120 , and these constituent elements are provided in the same casing  130 . 
     The analysis unit  50 ′ is configured to include a processing section (CPU)  201 , a communication section  210 , an operation section  220 , the storage section  350 , and a display section  260 . 
     The analysis unit  50 ′ may be a personal computer, a high function mobile phone (smart phone), a multi-function portable terminal (tablet terminal) or the like. 
     The storage section  350  maybe a ROM, a RAM, a nonvolatile memory, and the like, and stores programs for the processing section  201  performing various computation processes or control processes, various programs or data, etc., for realizing application functions, and temporarily stores a read program or data read from, data which is input from the operation section  220 , results of calculation, etc., which is performed by the processing section  201  according to various programs or application functions, and the like. 
     The processing section  201  is configured to include a calculation portion  202 , a determination portion  204 , and an analysis portion  206 . The processing section  201  performs various processes such as a computation process, an analysis process, and a determination process on the motion signal  70  which is received from the sensor unit  10  via the communication section  210  according to the program stored in the storage section  350 . 
     In the processing section  201 , the calculation portion  202  performs a calculation process on the motion signal  70  transmitted from the sensor unit  10 . The determination portion  204  performs a determination of quality of an attachment position of the sensor unit  10  attached to the golf club  500  or various determinations associated with motion analysis, on the basis of results of the calculation process. 
     The processing section  201  transmits a trigger (result) signal  80  regarding a determination result or the like to the sensor unit  10 , and transmits the trigger signal to the notification portion  30 . 
     The calculation portion  202  performs a calculation process on the motion signal  70  transmitted from the sensor unit  10 . The analysis portion  206  performs motion analysis of a measurement target on the basis of a calculation process result. 
     The determination portion  204  has a determination function of performing determination such as a determination of whether or not motion is detected or a determination of each timing of motion on the basis of a motion analysis result in the analysis portion  206 . 
       FIG. 14  is a block diagram illustrating details of respective functions of the processing section  201 .  FIG. 15  is a diagram illustrating details of information stored in the storage section  350 . 
     The calculation portion  202  includes an image processor  203 , a position computer  304 , a position corrector  205 , and a speed computer  306 . The analysis portion  206  includes a motion analysis information generator  208  having an analysis function. The position computer  304 , the position corrector  205 , the speed computer  306 , and the motion analysis information generator  208  correspond to a correction portion having a correction function. 
     The storage section  350  stores a swing analysis program  251 , a standing still state determination program  252 , a distance calculation program  253 , club specification information  254 , and sensor attachment position information  255 . 
     The standing still state determination program  252  and the distance calculation program  253  are sub-set programs called by the swing analysis program  251 . A user may update or uninstall the swing analysis program  251 , the standing still state determination program  252 , and the distance calculation program  253  stored in the storage section  350 . The user may install other sub-set programs as necessary. For example, there maybe a sub-set program in which an image of a golf ball hit by swinging the golf club  500  is captured, image processing is performed on the captured image so that a state of collision with the face  500   f  is analyzed, and thus a flight direction or a flight distance of the golf ball is estimated. 
     The image processor  203  has an image processing function. In other words, the image processor  203  extracts an image signal from the motion signal  70 , and applies, for example, a well-known pattern matching technique to an image based on the extracted image signal so as to extract a captured image of a region including the head  500   h  of the golf club  500  and a golf ball. 
     The image processor  203  performs image processing using a well-known edge extraction technique or the like on the extracted captured image so as to generate a processed image, analyzes the processed image, and calculates a distance between a predetermined portion (for example, the face  500   f ) of the head  500   h  and the golf ball which is a predetermined target object by counting the number of pixels therebetween. The image processor  203  outputs the calculated distance information or data of the captured image having undergone the image processing in response to a request from another functional constituent element. 
     The position computer  304  performs a process of calculating a position (a coordinate of a position in an XYZ coordinate system) of the head  500   h  of the golf club  500  in a swing by using measured data output from the sensor unit  10 . 
     The position computer  304  performs a process of calculating a position (a coordinate of a position in the XYZ coordinate system) of the grip  500   g  of the golf club  500  in a swing by using measured data output from the sensor unit  10 . In the present embodiment, the XYZ coordinate system (global coordinate system) having a target line indicating a target hit ball direction as an X axis, an axis on a horizontal plane perpendicular to the X axis as a Y axis, and a vertically upward direction (a direction opposite to the gravitational direction) as a Z axis is defined. 
     Specifically, first, the position computer  304  computes an offset amount included in the measured data by using measured data (acceleration data and angular velocity data) during standing still (at address) of the user, stored in the storage section  350 . Next, the position computer  304  subtracts the offset amount from the measured data after swing starting, stored in the storage section  350 , so as to perform bias correction, and computes a position and an attitude (attitude angle) of the sensor unit  10  during a swing action of the user by using the bias-corrected measured data. 
     For example, the position computer  304  acquires the distance information output from the image processor  203 , and determines a standing still state in an address state of the user in a case where a change in the distance is included in a predetermined range. The position computer  304  computes a position (initial position) of the sensor unit  10  in the XYZ coordinate system by using acceleration data measured by the three-axis acceleration sensors  112 , and the club specification information  242  and the sensor attachment position information  244  stored in the storage section  350 , and integrates subsequent acceleration data so as to compute changes in positions from the initial position of the sensor unit  10  in a time series. 
     The position computer  304  computes an attitude (initial attitude) of the sensor unit  10  during standing still (at address) of the user in the XYZ coordinate system by using acceleration data measured by the three-axis acceleration sensors  112 , and then time-serially computes changes in attitudes from the initial attitude of the sensor unit  10  by performing rotation calculation using angular velocity data measured by the three-axis gyro sensors  114 . 
     The position corrector  205  performs a process of correcting position information of the head  500   h  of the golf club  500 , acquired from data measured by the sensor unit  10 , on the basis of a difference between a position of the head  500   h  of the golf club  500  during swing starting and a position of the head  500   h  of the golf club  500  at impact. 
     Here, with reference to  FIGS. 16A and 16B , a description will be made of correction of a position of the head  500   h  of the golf club  500 . 
       FIG. 16A  illustrates trajectories (trajectories of the head  500   h  and the grip  500   g ) of the golf club  500  drawn by using a position of the head  500   h  before being corrected, obtained through computation, and  FIG. 16B  illustrates trajectories of the golf club  500  drawn by using a position of the head  500   h  after being corrected. 
     In  FIGS. 16A and 16B , the reference signs S 1 , HP 1 , and GP 1  respectively indicate positions of the shaft  500   s,  the head  500   h,  and the grip  500   g  during swing starting, and the reference signs S 2 , HP 2 , and GP 2  respectively indicate positions of the shaft  500   s,  the head  500   h,  and the grip  500   g  at impact. 
     In  FIGS. 16A and 16B , the position HP 1  of the head  500   h  during swing starting matches the origin (0,0,0) of the XYZ coordinate system. A dashed line HL 1  and a solid line HL 2  respectively indicate trajectories of the head  500   h  during a backswing and a downswing, and a dashed line GL 1  and a solid line GL 2  respectively indicate trajectories of the grip  500   g  during a backswing and a downswing. A connection point between the dashed line HL 1  and the solid line HL 2  and a connection point between the dashed line GL 1  and the solid line GL 2  respectively correspond to a position of the head  500   h  and a position of the grip  500   g  at a top of the swing (when a swing direction is changed). 
     Since the head  500   h  is located slight in front of a ball during swing starting, and comes into contact with the ball at impact, positions of the head  500   h  during swing starting and at impact may be substantially the same as each other in an actual swing. However, as illustrated in  FIG. 16A , the position HP 2  of the head  500   h  at impact, obtained through computation, is located at a position slightly deviated from the position HP 1  of the head  500   h  during swing starting due to the influence of an integration error or the like of an acceleration or an angular velocity. In other words, the trajectory illustrated in  FIG. 16A  is slightly different from a trajectory of an actual swing. 
     Therefore, for example, if a position of the head  500   h  at one of the time of swing starting and the time of impact is corrected to match a position at the other thereof under the premise that positions of the head  500   h  during swing starting and at impact are substantially the same as each other in an actual swing in  FIG. 16A , as illustrated in  FIG. 16B , the positions of the head  500   h  during swing starting and at impact are the same as each other, and thus trajectories closer to the actual swing than the trajectories illustrated in  FIG. 16A  can be obtained. 
     If the correction is performed by using a position of the head  500   h  right before impact, that is, a distance XL between the head  500   h  and the golf ball, output from the image processor  203 , it is possible to correct an error with higher accuracy than in the above description. 
     Referring to  FIG. 14  again, the position corrector  205  analyzes the captured image output from the image processor  203  so as to calculate the distance XL between the head  500   h  of the golf club  500  and the golf ball at address. Here, by using a position of the head  500   h  of the golf club  500  at one of the time of swing starting and the time of impact, the position corrector  205  corrects a position of the head  500   h  of the golf club  500  at the other thereof by also taking into consideration the calculated distance XL. 
     The speed computer  306  corrects speed information of the head  500   h  of the golf club  500 , acquired from the measured data in the sensor unit  10 , on the basis of a difference between the position of the head  500   h  of the golf club  500  during swing starting and the position of the head  500   h  of the golf club  500  at impact. In the present embodiment, a speed of the head  500   h  is calculated by using time-series information regarding corrected positions of the head  500   h  generated by the position corrector  205 . 
     The motion analysis information generator  208  performs a process of performing swing analysis by using the corrected position information or the corrected speed information, and generating motion analysis information which is information indicating an analysis result. For example, the motion analysis information generator  208  generates trajectory information (image data) indicating movement of the golf club  500  in a predetermined swing period by using time-series information regarding positions of various portions of the golf club  500 , generated by the position corrector  205 . 
     For example, the motion analysis information generator  208  may sequentially connect positions (coordinates) of the head  500   h  from the time of swing starting to the time of impact, and, similarly, may sequentially connect positions (coordinates) of the grip  500   g  from the time of swing starting to the time of impact, so as to generate trajectory information including trajectories (HL 1  and HL 2  in  FIG. 16B ) of the head and trajectories (GL 1  and GL 2  in  FIG. 16B ) of the grip from the time of swing starting to the time of impact. The motion analysis information generator  208  may correct the generated trajectory information on the basis of the motion signal  70 . In other words, correction targets in the present embodiment may be at least one of motion information such as an acceleration or an angular velocity based on the motion signal  70 , and information regarding an analyzed speed, trajectory or the like. 
     &lt;Motion Analysis Method&gt; 
     A motion analysis method of the present embodiment includes a measurement preparation process, a motion measurement process, a transmission process of transmitting the motion signal  70  obtained in the motion measurement process to the analysis unit  50 ′, and an analysis process of analyzing the motion signal  70  transmitted in the transmission process. The motion analysis method includes a standing still state notification process of performing a notification of completion of the measurement preparation process, a measurement completion notification process of performing a notification of completion of the motion measurement process, and a transmission completion notification process of performing a notification of completion of transmission of the motion signal  70  from the sensor unit  10  to the analysis unit  50 ′. 
     Each process will be described for each step with reference to a flowchart illustrated in  FIG. 17  with respect to the motion analysis method of the present embodiment using the motion detection apparatus  1 ′. Regarding the description of the motion analysis method, the motion analysis method in which the motion detection apparatus  1 ′ is applied to the golf club  500  will be described. 
     &lt;Measurement Preparation Process&gt; 
     The measurement preparation process is a process of preparing for measurement of motion, and is a process of measuring a bias of the sensor  110  before starting motion (swing). 
     Here, the bias collectively indicates a zero bias in an initial state in which angular velocity is zero before the user starts motion, and a drift caused by an external factor such as a power source fluctuation or a temperature change. 
     In the measurement preparation process, in step S 10 , the analysis unit  50 ′ acquires the motion signal  70  in a case of a standing still state (so-called address state) in which the user holds the golf club  500  and stands still. The measurement preparation process includes an imaging process of the imaging portion  150  capturing an image of the head  500   h  of the golf club  500 . 
     In the measurement preparation process, in step S 20 , the calculation portion  202  calculates the motion signal  70  acquired by the analysis unit  50 ′. 
     In the present embodiment, in step S 20 , the standing still state determination program  252  and the distance calculation program  253  stored in the storage section  350  are read and executed. 
     In other words, the distance calculation program  253  extracts an image signal from the motion signal  70  calculated by the calculation portion  202  in step S 20 , and extracts a captured image of a region including the head  500   h  of the golf club  500  and a golf ball at a predetermined time interval in an image processing process of processing the extracted image signal. The distance calculation program  253  performs image processing on the extracted captured image so as to calculate the distance XL between the head  500   h  and the golf ball, and record the calculated distance information in the storage section  350 . 
     The standing still state determination program  252  reads the distance information which is stored in a time series, and examines a change in the distance information associated with time elapse. For example, in a case where a change amount of the distance XL is equal to or less than a predetermined reference value, and a state in which the change amount is equal to or less than the predetermined reference value lasts for a predetermined time (for example, 3 seconds), it is determined that the golf club  500  is in a standing still state. 
     In the measurement preparation process, in step S 30 , in a case where it is determined that the golf club  500  is in a standing still state (YES), the process proceeds to a notification of “standing still state detection” in step S 41 , and the motion signal  70  at that time is stored in the storage section  350  as a bias value. 
     In a case where it is determined that the golf club  500  is not in a standing still state in step S 30  (NO), a notification of a “standing still state detection error” is performed in step S 42 , and the process returns to step S 10  so as to be performed again from acquisition of the motion signal  70  in a standing still state. 
     The detection of a standing still state is not limited to analyzing an output signal from the sensor  110 , and may have an aspect of determining a standing still state by processing an image captured by the imaging portion  150 . 
     &lt;Standing Still State Notification Process&gt; 
     The standing still state notification process is a process of performing a notification of a determination result of whether or not the golf club  500  and the user holding the golf club  500  are in a standing still (address) state on the basis of the motion signal  70  in the above-described measurement preparation process. 
     In the standing still state notification process, in a case where it is determined that the golf club  500  and the user holding the golf club  500  are in a standing still state on the basis of the motion signal  70  in step S 30 , a notification of “standing still state detection” is performed in step S 41 . The notification is also a notification that the measurement target has started motion. 
     In the standing still state notification process, in a case where it is determined that the golf club  500  and the user holding the golf club  500  are not in a standing still state on the basis of the motion signal  70  in step S 30 , a notification of a “standing still state detection error” is performed in step S 42 . 
     The standing still state notification process is performed by the light emitter  132  provided in the notification portion  30 . Here, the notification of standing still state detection in the notification portion  30  is performed by using blinking and light emission colors of the light emitter  132 . The notification portion  30  may change a light emission color and a blinking pattern according to information notified by the user. 
     The notification of “standing still state detection” in step S 41  is performed by using a light emission color and a notification (blinking) pattern of the light emitter  132 . A light emission color and a notification pattern corresponding to “standing still state detection” are set in advance. 
     The notification of “standing still state detection error” in step S 42  is performed through light emission of the light emitter  132  so as to be different from the notification of “standing still state detection”. A light emission color and a notification pattern corresponding to “standing still state detection error” are set in advance. Consequently, the user is notified of “standing still state detection error” and is also prompted to maintain a standing still (address) state. 
     &lt;Motion Measurement Process&gt; 
     The motion measurement process is a process of measuring motion (swing) of the user holding the golf club  500 . The motion measurement process is a process in which the sensor  110  mounted in the sensor unit  10  measures motion (swing) of the user. 
     In the motion measurement process, in step S 50 , an acceleration or the like associated with the motion of the user is acquired from the sensor  110  as the motion signal  70 . 
     &lt;Transmission Process&gt; 
     The transmission process is a process of transmitting, to the analysis unit  50 ′, the motion signal  70  which is acquired in the motion measurement process and is based on the motion (swing) of the user holding the golf club  500 . 
     In the transmission process, in step S 60 , the acquired motion signal  70  is transmitted from the sensor unit  10  to the analysis unit  50 ′. 
     In the transmission process, in step S 70 , the determination portion  204  performs a second determination of whether or not an error (for example, an over-range or missing) is included in the motion signal  70  transmitted to the analysis unit  50 ′ in step S 60 . In the transmission process, in step S 70 , the determination portion  204  performs the second determination of whether or not the acceleration or the like associated with the motion exceeds a preset value on the basis of the motion signal  70  transmitted to the analysis unit  50 ′ in step S 60 . 
     The error determination is performed through comparison with the normal motion signal  70  recorded in the storage section  350  in advance as a threshold value. The determination of the acceleration or the like associated with the motion is performed through comparison with the motion signal  70  recorded in the storage section  350  in advance as the threshold value. The determination of the acceleration or the like associated with the motion may be performed by using any value of the motion signal  70  such as the maximum value or the minimum value of the motion signal  70  of the user as the threshold value. 
     In a case where it is determined that an error is not included in the motion signal  70  in step S 70 , or the motion signal  70  exceeds the preset threshold value (satisfies the condition of the threshold value) (YES), the process proceeds to a notification of “favorable measurement” in step S 81 . In a case where it is determined that an error is included in the motion signal  70  in step S 70  (NO), the process proceeds to a notification of “measurement error” in step S 82 , and also returns to step S 10  so that motion analysis is performed again from acquisition of the motion signal  70  in a standing still state. 
     The notification of “favorable measurement” in step S 81  is performed by using a light emission color and a notification (blinking) pattern of the light emitter  132 . A light emission color and a notification pattern corresponding to “favorable measurement” are set in advance. 
     The notification of “measurement error” in step S 82  is performed by using a light emission color and a notification (blinking) pattern of the light emitter  132 . A light emission color and a notification pattern corresponding to “measurement error” are set in advance. Consequently, the user is notified of “measurement error”, and it is also prompted that motion analysis is performed again from acquisition of the motion signal  70  in a standing still state in step S 10 . 
     In the transmission process, in step S 90 , the determination portion  204  determines whether or not transmission of the motion signal  70  transmitted to the analysis unit  50 ′ in step S 60  is completed. The determination of transmission completion is performed by receiving start parity and end parity which are added to the motion signal  70  (packet data) by the data processing portion  120 A of the sensor unit  10 . In a case where the end parity is received until a predetermined time stored in the storage section  350  in advance elapses after the start parity is received in step S 90  (YES), transmission completion is determined, and thus the process proceeds to a notification of “transmission completion” in step S 101 . In a case where the end parity is not received until the predetermined time elapses (NO), the process proceeds to a notification of “transmission error” in step S 102 , and also returns to step S 10  so that motion analysis is performed again from acquisition of the motion signal  70  in a standing still state. 
     The notification of “transmission completion” in step S 101  is performed by using a light emission color and a notification (blinking) pattern. A light emission color and a notification pattern corresponding to “transmission completion” are set in advance. Consequently, the user is notified of “transmission completion”. 
     The notification of “transmission error” in step S 102  is performed by using a light emission color and a notification pattern corresponding to “transmission error” and set in advance. Consequently, the user is notified of “transmission error”, and it is also prompted that motion analysis is performed again from acquisition of the motion signal  70  in a standing still state in step S 10 . 
     &lt;Analysis Process&gt; 
     The analysis process is a process of analyzing the motion signal  70  transmitted to the analysis unit  50 ′, acquired in the motion measurement process, and based on the motion (swing) of the user holding the golf club  500 . 
     In the analysis process, the motion signal  70  transmitted to the analysis unit  50 ′ in step S 110  and based on the motion (swing) of the user, is analyzed according to the swing analysis program  251  stored in the storage section  350 . In the analysis process, an analysis result is displayed (output) on the display section  260 . The above-described correction process of correcting a position of the head  500   h  of the golf club  500  may be executed by the swing analysis program  251 . 
     A technique of analyzing a swing motion on the basis of output signals (acceleration data and angular velocity data) from the sensor  110 , included in the motion signal  70 , may employ a technique disclosed in a patent publication (for example, JP-A-2014-90773). 
     In the analysis process, in step S 120 , the determination portion  204  determines the analysis result in step S 110 . 
     In the analysis process, in step S 120 , the determination portion  204  compares the analysis result of the motion signal  70  analyzed in step S 110  with an analysis result (hereinafter, referred to as a “standard analysis result”) within a predetermined range recorded in the storage section  350  in advance, so as to determine whether or not the analysis result is included in the range of the standard analysis result. 
     In a case where it is determined that the analysis result is included in the range of the standard analysis result in step S 120  (YES), the process proceeds to a notification of “analysis completion” in step S 131 . In a case where it is determined that the analysis result is not included in the range of the standard analysis result in step S 120  (NO), the process proceeds to a notification of “analysis error” in step S 132 , and also returns to step S 10  so that motion analysis is performed again from acquisition of the motion signal  70  in a standing still state. 
     The notification of “analysis completion” in step S 131  is performed by using a light emission color and a notification (blinking) pattern. A light emission color and a notification pattern corresponding to “analysis completion” are set in advance. Consequently, the user is notified of “analysis completion”. 
     The notification of “analysis error” in step S 132  is performed by using a light emission color and a notification (blinking) pattern. A light emission color and a notification pattern corresponding to “analysis error” are set in advance. Consequently, the user is notified of “analysis error”. Consequently, the user is notified of “analysis error”, and it is also prompted that motion analysis is performed again from acquisition of the motion signal  70  in a standing still state in step S 10 . 
     In the motion analysis method, a series of processes are finished when the notification of “analysis completion” in step S 131  is performed. 
     In the above-described motion analysis method, the respective steps after the notification of “standing still state detection” in step S 41  are continuously performed. In the above-described motion analysis method, the notifications in the respective steps after the notification of “standing still state detection” in step S 41  may be omitted or added as appropriate. 
     According to Embodiment 5, the following effects are achieved in addition to the effects achieved by the above-described embodiments. 
     According to Embodiment 5, image processing is performed on an image of the head  500   h  of the golf club  500 , captured by the imaging portion  150  of the sensor section  100 , so that information regarding a standing still state of the head  500   h  at address or information regarding a distance between the head  500   h  and a golf ball is acquired, a swing of the golf club  500  is analyzed by using the acquired information, and thus it is possible to analyze a swing motion with high accuracy. 
     An apparatus performing the above-described technique may be implemented by a single apparatus, and may be implemented by a combination of a plurality of apparatuses, and thus various aspects may occur. 
     The embodiments of the invention have been described with reference to the drawings, but a specific configuration is not limited to the embodiments, and design change and the like may occur within the scope without departing from the spirit of the invention. For example, there may an aspect in which the motion detection apparatuses  1  and  1 ′ have the motion state analysis function of the analysis units  50  and  50 ′. 
     Each functional element illustrated in  FIGS. 1, 2 and 8  indicates a functional configuration realized in cooperation between hardware and software, and a specific mounting aspect is not particularly limited. Therefore, there may be a configuration in which individually corresponding hardware is not necessarily mounted in each functional unit, and a single processor executes a program so as to realize functions of a plurality of functional units. In the above-described embodiments, some functions realized by software may be realized by hardware, or some functions realized by hardware maybe realized by software. Specific detailed configurations of other respective units of the motion detection apparatuses  1  and  1 ′ may also be arbitrarily changed within the scope without departing from the spirit of the invention. 
     REFERENCE SIGNS LIST 
     
         
           1  AND  1 ′ MOTION DETECTION APPARATUS, 
           10  SENSOR UNIT, 
           30  NOTIFICATION PORTION, 
           50  AND  50 ′ ANALYSIS UNIT, 
           70  MOTION SIGNAL, 
           80  TRIGGER SIGNAL, 
           100  SENSOR SECTION, 
           110  SENSOR, 
           112   x,    112   y,  AND  112   z  ACCELERATION SENSOR, 
           114   x,    114   y,  AND  114   z  ANGULAR VELOCITY SENSOR, 
           120  CONTROLLER, 
           120 A DATA PROCESSING PORTION, 
           120 B POWER SOURCE PORTION, 
           120 C COMMUNICATION PORTION, 
           130  CASING, 
           132  LIGHT EMITTER, 
           132   a  FIRST LIGHT EMITTER, 
           132   b  SECOND LIGHT EMITTER, 
           150  IMAGING PORTION, 
           152  CASING, 
           153  PROJECTION PORTION, 
           154  LENS PORTION, 
           155  PATTERN IMAGE, 
           156  CAMERA, 
           157  CONTROLLER, 
           158  COMMUNICATION DEVICE, 
           160  HOLDER, 
           200  HOLDER, 
           201  PROCESSING SECTION, 
           202  CALCULATION PORTION, 
           204  DETERMINATION PORTION, 
           206  ANALYSIS PORTION, 
           210  COMMUNICATION SECTION, 
           220  OPERATION SECTION, 
           230  ROM, 
           240  RAM, 
           250  NONVOLATILE MEMORY, 
           260  DISPLAY SECTION, 
           304  POSITION COMPUTER, 
           306  SPEED COMPUTER, 
           350  STORAGE SECTION, 
           500  GOLF CLUB, 
           500   g  GRIP, 
           500   h  HEAD, 
           500   s  SHAFT, 
           500   f  FACE (FACE SURFACE), 
         M SUBJECT, 
         e VISUAL LINE