JP6700533B2 - Weight information output system and program - Google Patents

Description

  The present disclosure relates to a system and a program that outputs weight information.

  BACKGROUND ART Conventionally, there is known a weight measurement system that measures a user's weight using a load cell (see, for example, Patent Document 1). The weight measurement is performed, for example, for health management of the user.

JP 2012-057969 A

  The conventional scale using the load cell is heavy and large in size, and is not suitable for carrying. For this reason, the user can usually measure the weight at a place where the scale is placed, such as at home, only during the time zone in which the scale is located. Thus, conventional scales are inconvenient for the user in that their use is very limited in location and time.

  Therefore, in one aspect of the present disclosure, it is desirable to be able to provide a highly convenient system for weighing.

  A weight information output system according to one aspect of the present disclosure includes an acquisition unit configured to acquire acceleration information of a living body from an acceleration sensor. The weight information output system further includes an output unit configured to output the weight information of the living body from the acceleration information acquired by the acquisition unit.

  According to one aspect of the present disclosure, the output unit may be configured to output, as the weight information of the living body, the weight specified from the correspondence between the predetermined characteristic amount and the weight relating to the change in acceleration. Specifically, the output unit is the weight specified from the above correspondence, and the weight corresponding to the characteristic amount relating to the acceleration change of the living body specified from the acceleration information acquired by the acquisition unit is used as the weight information of the living body. It is configured to output.

  The change in acceleration when a living body moves shows a characteristic according to the weight of the living body. Therefore, according to the environment in which the correspondence between the feature amount related to the change in the acceleration of the living body and the weight is derived in advance by a test or the like, the change in the acceleration of the living body identified from the correspondence and the acceleration information obtained from the acceleration sensor. It is possible to specify the weight of the living body based on the feature amount regarding

  As the acceleration sensor, a lightweight and small product is known. At present, portable devices equipped with an acceleration sensor are also in widespread use. Thus, the acceleration sensor has high portability. Therefore, according to one aspect of the present disclosure, by utilizing the high portability of the acceleration sensor, a weight information output system that is more convenient and has less space and time restrictions for weight measurement than ever before is provided. be able to.

  According to one aspect of the present disclosure, the weight information output system may further include a derivation unit configured to derive the correspondence relationship. The derivation unit acquires information on the initial weight of the living body, further acquires acceleration information of the living body when the living body has an initial weight, and based on the acquired information on the initial weight and the acceleration information, the above correspondence relationship is obtained. It can be configured to derive. The derivation unit may be configured to derive a corresponding relationship suitable for the living body corresponding to the acceleration information by correcting the standard correspondence relationship based on the information regarding the initial weight and the acceleration information.

  According to one aspect of the present disclosure, the correspondence relationship may indicate a relationship between the feature amount and the weight of the living body when walking. In this case, the acquisition unit may be configured to acquire, as the acceleration information, acceleration information when the living body is walking from the acceleration sensor. The output unit may be configured to output the weight information of the living body based on the acceleration information. According to one aspect of the present disclosure, the living body can be a human or an animal.

  According to the 1 side of this indication, the above-mentioned correspondence may show the relation of the feature quantity and the weight when a person goes up and down stairs. In this case, the acquisition unit may be configured to acquire, as the acceleration information, acceleration information when a person goes up and down the stairs from the acceleration sensor. The acquisition unit, based on the position information of the person obtained from the position detector, detects that the person is located in an area preset as an area where the stairs exist, and obtains acceleration information when the person goes up and down the stairs. It may be configured to acquire from an acceleration sensor. The acquisition unit may be configured to detect that a person is located in an area where the stairs are present based on an input from a user, and acquire acceleration information when the person moves up and down the stairs from an acceleration sensor. ..

  According to one aspect of the present disclosure, the feature amount may be a change amount of acceleration per step of the living body. The above correspondence may indicate the relationship between the amount of change in the acceleration per step of the living body and the weight for each gait. In this case, the output unit changes the acceleration per one step of the living body specified from the acceleration information according to the relationship corresponding to the step specified from the acceleration information acquired by the acquisition unit among the above relationships shown for each step. The weight corresponding to the amount may be configured to be output as the weight information of the living body.

  According to one aspect of the present disclosure, the output unit may be configured to execute a feature amount calculation process of calculating a feature amount based on the acceleration information acquired by the acquisition unit. The output unit may be configured to execute the weight identifying process for identifying the weight corresponding to the feature amount calculated by the feature amount calculating process according to the correspondence relationship. The output unit may be configured to execute an output process of outputting the weight specified by the weight specifying process as the weight information of the living body.

  According to one aspect of the present disclosure, the feature amount may be a change amount of the acceleration per cycle in the periodic fluctuation of the acceleration caused by the walking of the living body, and the correspondence relationship is one of the periodic fluctuations of the acceleration. The relationship between the amount of change in acceleration per cycle and the weight may be shown for each cycle length, which is the time length per cycle.

  In this case, the output unit further performs a cycle calculation process of calculating the cycle length from the acceleration information acquired by the acquisition unit, and calculates the feature amount calculation process according to the relationship corresponding to the cycle length calculated by the cycle calculation process. It may be configured to specify the weight corresponding to the amount of change in the acceleration per cycle.

  According to one aspect of the present disclosure, the correspondence may be represented by a table or a function. The output unit may be configured to store the correspondence in the form of a table or a function. According to an aspect of the present disclosure, a program for causing a computer to function as at least one of the acquisition unit, the output unit, and the derivation unit described above may be provided.

  According to one aspect of the present disclosure, a procedure of acquiring acceleration information of a living body from an acceleration sensor, a procedure of calculating a feature amount related to a change in the acceleration of the living body based on the acceleration information, A program may be provided for causing a computer to execute a procedure of identifying the weight corresponding to the calculated feature amount and a procedure of outputting the identified weight as the weight information of the living body according to the correspondence relationship.

  This program acquires information about the initial weight of the living body, further acquires acceleration information of the living body when the living body has the initial weight, and derives a correspondence relationship based on the acquired information about the initial weight and the acceleration information. The procedure may be provided as a program for causing a computer to further execute the procedure. The program may be provided through an electric communication line, or may be provided by being stored in a computer-readable non-transitional substantive recording medium.

It is a block diagram showing the structure of a portable device. FIG. 2A is a graph showing the triaxial acceleration of a subject having a weight of 40 kg, and FIG. 2B is a graph showing the triaxial acceleration of a subject having a weight of 80 kg. It is a flow chart showing measurement display processing which a control unit performs. 6 is a flowchart showing a correction amount determination process executed by a control unit. It is a flow chart showing a motion judging processing which a control unit performs. It is explanatory drawing regarding a step interval and an acceleration change width. It is a graph which shows the correspondence of an acceleration change width and weight with an approximate function. It is a flow chart showing the main measurement processing which a control unit performs. It is a flow chart showing a part of measurement display processing in a second embodiment. It is a block diagram showing the composition of the weight measurement system of a third embodiment. It is a graph which shows another example of an approximate function. It is a graph which shows another example of an approximate function. It is a graph which shows another example of an approximate function.

Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings.
[First embodiment]
The weight measurement system 1 of the present embodiment is a system that measures the weight of a user who carries the mobile device 10 using an acceleration sensor 13 included in the mobile device 10. The weight measuring system 1 is configured to measure the weight of the user by utilizing the fact that a characteristic corresponding to the weight of the user appears in the trajectory of acceleration detected by the acceleration sensor 13 when the user walks.

  The mobile device 10 is configured, for example, by installing a measurement program specific to the present embodiment in a mobile communication terminal having an acceleration sensor 13. A smartphone is included in an example of a mobile communication terminal. However, the mobile device 10 may not have a communication function, or may be a device dedicated to weight measurement.

  As shown in FIG. 1, the mobile device 10 includes a control unit 11, a storage unit 12, and an acceleration sensor 13. The mobile device 10 further includes a display 15 and an operation unit 16 as a user interface. The mobile device 10 further includes a GPS receiver 18 and a communication unit 19, similar to a known smartphone. These components operate by receiving power supply from a battery (not shown) included in the mobile device 10.

  The control unit 11 includes a CPU 111 and a RAM 115. The storage unit 12 stores various programs and data. The programs stored in the storage unit 12 include the above-mentioned measurement program. The storage unit 12 is composed of, for example, a flash memory.

  The CPU 111 executes a process according to a program stored in the storage unit 12 and totally controls the mobile device 10. The RAM 115 is used as a work area when the CPU 111 executes processing. Hereinafter, the processing executed by the CPU 111 will be described as the processing executed by the control unit 11 or the mobile device 10.

  The acceleration sensor 13 is configured to detect the acceleration of the mobile device 10 and input a signal representing the detected acceleration to the control unit 11. The acceleration sensor 13 is configured as, for example, a triaxial acceleration sensor which is a type of MEMS sensor. In this case, the acceleration sensor 13 can detect the acceleration of each of the X, Y, and Z axes that are orthogonal to each other, and can input a signal representing the detected acceleration of each of the axes to the control unit 11. When the acceleration sensor 13 is a three-axis acceleration sensor, “acceleration” that does not refer to an axis below represents the magnitude (specifically, L2 norm) of a three-dimensional acceleration vector having the acceleration of each axis as an element. I want you to understand.

  The display 15 is controlled by the control unit 11 and displays various information for the user. The display 15 is, for example, a liquid crystal display. The operation unit 16 is configured to input an operation signal from the user to the control unit 11. The operation unit 16 is configured to include at least one of a touch panel and a mechanical key switch, for example. The touch panel is provided on the display 15, for example.

  The GPS receiver 18 is configured as a position detector that receives radio waves transmitted from a plurality of GPS satellites and detects its own position based on these received signals. The GPS receiver 18 inputs its own position information to the control unit 11. The position information indicates the position coordinates of the GPS receiver 18 by latitude and longitude, for example. This position information corresponds to the position information of the user who carries the mobile device 10.

  The communication unit 19 has a communication function with an external device, specifically, a cellular communication function and a wireless LAN communication function. The communication unit 19 is configured to be controlled by the control unit 11 to communicate with an external device.

  Next, details of the processing executed by the control unit 11 according to the measurement program will be described. In this process, time-series data of the acceleration when the user holds the mobile device 10 so as not to move with respect to the body and walks is acquired as the acceleration data of the user. The weight of the user is measured based on the change in acceleration indicated by the acceleration data.

  FIG. 2A and FIG. 2B show a trajectory of acceleration of each axis obtained from a three-axis acceleration sensor when users having different weights walk down stairs by a graph having a horizontal axis of time and a vertical axis of acceleration. .. FIG. 2A represents the acceleration trajectory of a user having a weight of 40 kg, and FIG. 2B represents the acceleration trajectory of a user having a weight of 80 kg.

  As can be understood from FIGS. 2A and 2B, the acceleration change width for each step changes depending on the weight. The “step” mentioned here corresponds to an operation in which the user moves forward with one foot forward, and in FIG. 2A and FIG. 2B, the acceleration locus corresponding to one step is an acceleration locus for one cycle of acceleration that changes cyclically. Correspond. The acceleration change width corresponds to the difference between the maximum value and the minimum value of the acceleration in the period corresponding to one step. In the present embodiment, the weight of the user is measured by utilizing the correlation between the acceleration change width and the weight.

  The above-mentioned measurement program incorporates a function representing the correspondence between the acceleration change width and the body weight, in which the input variable x is the acceleration change width and the output variable y is the body weight. Hereinafter, this function will be referred to as a standard function f(x).

  The designer of the measurement program can obtain information on the acceleration change width from a plurality of subjects together with information on the weight of the subjects, and derive the standard function f(x) from these information. Specifically, the designer of the program can derive the standard function f(x) by a function fit with respect to a group of sample data including a combination of the acceleration change width and the body weight obtained from each subject by the test.

  The control unit 11 receives the standard function f(x), the acceleration change width obtained from the acceleration data, and the correction amount C (described later in detail) for the standard function f(x) based on the initial weight obtained from the user in advance. Based on this, the weight of the user is calculated.

  Specifically, the control unit 11 calculates the weight of the user by executing the measurement display process shown in FIG. 3 according to the measurement program. The control unit 11 can execute the measurement display process shown in FIG. 3 when the user inputs an execution instruction for the measurement program through the operation unit 16.

  When the measurement display process is started, the control unit 11 determines whether the correction amount C has been determined (S110). When the control unit 11 determines that the correction amount C has been determined (Yes in S110), the process proceeds to S130. When the control unit 11 determines that the correction amount C is not determined (No in S110), the control unit 11 executes the correction amount determination process shown in FIG. 4 in S120, determines the correction amount C, and then moves to S130.

  In the correction amount determination process, the control unit 11 causes the display 15 to display a screen requesting the user to input the initial weight. The user can input his or her current weight, which is measured using a conventional scale, as an initial weight in the mobile device 10. When the user inputs the initial weight through the operation unit 16 (S310), the control unit 11 proceeds to S320.

  In S320, the control unit 11 causes the display 15 to display a message instructing the user to execute the prescribed exercise. The prescribed exercise in the present embodiment is an exercise that walks down stairs and descends. Specifically, the prescribed exercise is an exercise in which the portable device 10 is held so as not to move with respect to the body and the stairs move down one step.

  On the display 15, a message for instructing the user to hold the portable device 10 with his/her hand so that he/she does not move with respect to his/her body and to step down the stairs in one step is displayed as a message to instruct execution of the prescribed exercise. You can

  The stipulated exercise is defined as an exercise that walks down the stairs because the exercise that moves down the stairs is more likely to show characteristics of weight in the change in acceleration than the exercise that walks on a flat surface. However, the prescribed motion may be defined as a motion of climbing stairs or a motion of walking on a flat surface. The prescribed exercise can be defined as any exercise in which the characteristic of weight appears in the acceleration trajectory.

  After displaying the message on the display 15, the control unit 11 starts acquisition of acceleration data (S330), and proceeds to S340. The control unit 11 can start the operation of accumulating the detected value of the acceleration indicated by the signal input from the acceleration sensor 13 in the RAM 115 as the time series data, as the operation of acquiring the acceleration data.

  In this way, the acceleration data corresponds to the time series data of the acceleration detected by the acceleration sensor 13. When the acceleration sensor 13 is a triaxial acceleration sensor, the time series data may be time series data of an acceleration vector including the acceleration of each axis as an element, and the magnitude (L2 norm) of this acceleration vector. May be time series data. According to the present embodiment, the acceleration data need only be data that can specify the magnitude of acceleration at each time.

  In S340, the control unit 11 executes an exercise determination process for determining whether or not the user is in the prescribed exercise. Specifically, the control unit 11 can execute the motion determination process shown in FIG.

  When the motion determination process shown in FIG. 5 is started, the control unit 11 calculates the step interval Ts and the acceleration change width x from the acceleration data (S510). The magnitude of the acceleration indicated by the acceleration data shows a periodic fluctuation as shown in FIG. 6 when the user walks.

  The step interval Ts calculated here corresponds to the time length of one cycle of the varying acceleration. The acceleration change width x corresponds to the difference between the maximum value and the minimum value of the acceleration in one cycle, and corresponds to the amount of change in the acceleration per step. The one-cycle acceleration locus corresponds to the acceleration locus for one step of the user, and specifically corresponds to the acceleration locus for one step when the user steps down one step on the stairs. In S510, the step interval Ts and the acceleration change width x may be calculated as an average value for a plurality of cycles, or the single cycle step interval Ts and the acceleration change width x may be calculated.

  After that, the control unit 11 determines whether or not the calculated step interval Ts is within the specified range (S520). The prescribed range is defined as the normal range of the step interval Ts when the user is performing the prescribed exercise. For example, the specified range may be set such that the step interval Ts deviates from the specified range when the user is stopped and running down the stairs. When the control unit 11 determines that the step interval Ts is within the specified range (Yes in S520), the control unit 11 proceeds to S530, and when it determines that the step interval Ts is outside the specified range (No in S520), the control unit 11 proceeds to S540.

  In S530, the control unit 11 determines whether or not the acceleration change width x is within the specified range. The specified range is defined as a normal range of the acceleration change width x when the user is performing a specified exercise. For example, the specified range may be set such that the acceleration change width x deviates from the specified range when the user is stopped. When the control unit 11 determines that the acceleration change width x is within the specified range, the control unit 11 estimates that the user is performing the specified exercise and ends the exercise determination process. On the other hand, when the control unit 11 determines that the acceleration change width x is outside the specified range, the control unit 11 proceeds to S540.

  In S540, the control unit 11 causes the display 15 to display a message instructing to perform the prescribed exercise, and proceeds to S510. In this way, the control unit 11 does not end the motion determination process until it is estimated from the acceleration data that the user has started the specified exercise, and that the user has started the specified exercise from the acceleration data. If estimated, the motion determination process ends.

  When the motion determination process is completed in S340 (see FIG. 4 ), the control unit 11 proceeds to S350. In S350, the control unit 11 calculates the step interval Ts and the acceleration change width x based on the change in the user's acceleration after the execution of the motion determination process, which is indicated by the acceleration data, as in the process in S510.

  The control unit 11 inputs the calculated acceleration change width x into the standard function f(x) to calculate the weight y corresponding to the change width x (S360). The standard function f(x) is prepared for each step interval Ts.

  That is, the control unit 11 calculates the standard function f(x) corresponding to the step interval Ts calculated in S350 among the standard functions f(x) for each step interval Ts incorporated in the measurement program. By substituting the acceleration change width x, the weight y=f(x) is calculated.

According to the example shown in FIG. 7, a standard function f (x) is a quadratic function ^{y = A1 · x 2 + A2} · x + A3. According to this example, the coefficients A1, A2 and A3 when the step interval is 0.51 seconds are A1=0.625, A2=-7.5 and A3=62.5, respectively. In the present embodiment, it is assumed that the weight of the measurement target is 40 kg or more, and in FIG. 7, the relationship between the acceleration change width x and the body weight y obtained from the subjects having a weight of 40 kg to 80 kg is plotted in a graph, The approximate function is represented by a thick solid line. The standard function f(x) illustrated in FIG. 7 indicates 40 kg when x=6 corresponding to the minimum value and 80 kg when x=14. This standard function f(x) can be used for the acceleration change width x of x=6 or more corresponding to the minimum value.

  The standard function f(x) may be prepared in units of 0.01 seconds of the step interval Ts, in units of 0.05 seconds, or in units of 0.1 seconds. , May be prepared in units between them. When the standard function f(x) is prepared in units of 0.01 seconds, the weight in S360 is calculated when the step interval Ts=0.50 seconds and when the step interval Ts=0.51 seconds. Different standard functions f(x) are used to calculate y.

  The designer of the measurement program can obtain the acceleration change width of the subject at each step interval and derive the standard function f(x) by function fitting at each step interval. As can be understood from the graph of FIG. 7, the acceleration change width x shows a larger value as the weight y increases. It is considered that such a tendency appears in part because the greater the weight, the greater the impact transmitted to the body when the foot lands.

  The control unit 11 repeatedly executes the process of calculating the step interval Ts and the acceleration change width x (S350), and the process of calculating the weight y based on these calculated values (S360) a predetermined number of times (S350-). S370). The calculation of the step interval Ts and the acceleration change width x in each time is performed based on the acceleration locus temporally after the acceleration locus referred to in the previous calculation.

  When the execution of the predetermined number of times is completed (Yes in S370), the control unit 11 ends the acquisition of the acceleration data from the acceleration sensor 13 (S380). Then, the calculated value of the predetermined number of weights y obtained by executing the predetermined number of times is statistically processed to calculate the representative value of the weight y (S390). Specifically, the average value of a predetermined number of weights y can be calculated as a representative value. However, the median value may be calculated as the representative value.

  Then, the control unit 11 determines whether the error of the representative value calculated in S390 with respect to the initial weight is within the allowable range (S400). The error referred to here corresponds to the difference between the representative value and the initial weight obtained from the user in S310. The allowable range can be set, for example, within a range of an error that can be accommodated if the user correctly performs the specified exercise.

  When the control unit 11 determines that the above error is outside the allowable range (No in S400), the control unit 11 causes the display 15 to display a message indicating that the measurement should be redone (S420). After displaying this message on the display 15, the control unit 11 proceeds to S320.

  When the control unit 11 determines that the error is within the allowable range (Yes in S400), the control unit 11 determines the correction amount C based on the error between the representative value calculated in S390 and the initial weight and stores the correction amount C in the storage unit 12. (S410). The correction amount C can be set to a value C=−E that cancels the error E=W−W0 between the representative value W calculated in S390 and the initial weight W0. The control unit 11 then ends the correction amount determination processing (S120), and proceeds to S130 (see FIG. 3).

  In S130, the control unit 11 causes the display 15 to display the main screen. The main screen is a screen for accepting various operations from the user through the operation unit 16. After that, the control unit 11 waits until an operation signal for the main screen is input by the user through the operation unit 16 (S140).

  When the operation signal is input (Yes in S140), the control unit 11 determines whether the input operation signal is a signal instructing the start of weight measurement (S150). When the control unit 11 determines that the operation signal is a signal instructing the start of weight measurement (Yes in S150), the process proceeds to S160.

  If it is determined that the operation signal is not a signal instructing the start of weight measurement (No in S150), the control unit 11 determines whether or not the input operation signal is a signal instructing the end of the measurement program. (S200). When determining that the operation signal is a signal instructing the end of the measurement program (Yes in S200), the control unit 11 ends the measurement display process.

  When the control unit 11 determines that the input operation signal is neither the signal instructing the start nor the signal instructing the end (No in S200), after executing the process corresponding to the input operation signal. (S210) and S130.

  After shifting to S160, the control unit 11 executes the main measurement process shown in FIG. In the main measurement process, the control unit 11 causes the display 15 to display a message instructing the user to execute the prescribed exercise, as in the process of S320 (S610).

  After that, the control unit 11 starts the acquisition of the acceleration data, similarly to the process of S330 (S620). Further, the control unit 11 executes the motion determination process shown in FIG. 5 (S630). The content of the motion determination process is as described above.

When the motion determination process is completed in S630, the control unit 11 reads the correction amount C stored in the storage unit 12 for the correction of the standard function f(x) (S640).
Thereafter, the control unit 11 calculates the step interval Ts and the acceleration change width x based on the change in the user's acceleration after the execution of the motion determination process indicated by the acceleration data, similarly to the process in S350 (S650).

  Further, the control unit 11 substitutes the calculated acceleration change width x into the function g(x)=f(x)+C to calculate the weight y corresponding to the acceleration change width x (S660). The function g(x) is a function obtained by correcting the standard function f(x) with the correction amount C.

  As described above, the standard function f(x) is prepared for each step interval Ts. In S660, the control unit 11 corrects the standard function f(x) corresponding to the step interval Ts calculated in S650 among the standard functions f(x) of the step interval Ts by the correction amount C. The weight y can be calculated using (x)=f(x)+C.

  The control unit 11 repeatedly executes the process of calculating the step interval Ts and the acceleration change width x (S650) and the process of calculating the weight y based on these calculated values (S660) a predetermined number of times (S650-). S670). The calculation of the step interval Ts and the acceleration change width x in each time is performed based on the acceleration locus temporally after the acceleration locus referred to in the previous calculation.

  When the execution of the predetermined number of times is completed (Yes in S670), the control unit 11 ends the acquisition of the acceleration data from the acceleration sensor 13 (S680), and the weight y of the predetermined number of pieces obtained by the execution of the predetermined number of times is determined. The calculated value is statistically processed to calculate the representative value of the body weight y as in the processing of S390 (S690). After that, the main measurement process ends.

  When the main measurement process in S160 ends in this way, the control unit 11 determines the representative value of the weight y calculated in S690 of the main measurement process as the user's weight measurement value in subsequent S170 (see FIG. 3). Display on the display 15. The display 15 displays the weight measurement value and a message asking the user whether or not to record the weight measurement value.

  After that, the control unit 11 waits until a response signal from the user to the above inquiry is input from the operation unit 16, and when the response signal is input, whether or not you agree to record the weight measurement value. Is determined (S180). When the control unit 11 determines that the user does not agree to record the weight measurement value (No in S180), the control unit 11 proceeds to S130.

  On the other hand, when the control unit 11 determines that the user has agreed to record the weight measurement value (Yes in S180), the storage unit 12 stores the weight measurement value displayed on the display 15 together with the information of the current date and time. It is recorded in the log file to be stored (S190). This log file corresponds to the weight measurement value history file. Then, the control unit 11 ends the measurement display process.

  According to the weight measurement system 1 of the present embodiment described above, when using the weight measurement function, the user first inputs the initial weight to the mobile device 10 and carries the correction amount C determination process (S120). The device 10 can be executed. After that, the user can know the weight of the user through the display 15 by inputting a signal instructing the start of the weight measurement through the operation unit 16 and performing the prescribed exercise. Further, the user can grasp the weight change of the user by operating the mobile device 10 and referring to the history of the weight measurement values recorded in the log file. Therefore, the weight measurement system 1 of the present embodiment is very useful for weight management of the user.

  In particular, according to this embodiment, the weight measuring function is provided in the mobile device 10 that the user can carry for a long period of time. Therefore, the user can measure the weight at any time within a limited time and space. As described above, according to the present embodiment, it is possible to provide the portable device 10 capable of performing weight measurement in an environment with a high degree of freedom in terms of location and time, and a highly convenient weight measurement system. 1 can be provided.

  In addition, in the present embodiment, since the correction amount C corresponding to the user is obtained and the weight calculated by the standard function f(x) is corrected, the user's habit (for example, walking habit) at the time of performing the prescribed exercise is corrected. It is possible to appropriately suppress the influence of the error from the standard function f(x) of the weight measurement value that occurs. That is, according to the present embodiment, the weight measurement value can be calculated with higher accuracy than the weight measurement value is calculated using the uniform standard function f(x) that does not depend on the user.

The weight measuring system 1 of the above embodiment may be modified as shown in FIG. 9.
[Second embodiment]
The weight measurement system 1 of the second embodiment is configured such that the control unit 11 executes the process shown in FIG. 9 after S150 of the measurement display process shown in FIG. According to this processing, when the control unit 11 determines that the signal instructing the start of weight measurement is input from the user (Yes in S150), the GPS receiver determines whether the portable device 10 is present in the staircase area. A determination is made based on the position information obtained from 18 (S155). For this determination, the storage unit 12 stores a map indicating the position of the staircase area. For example, the control unit 11 can store in the storage unit 12 a map that defines an area designated by the user through the operation unit 16 as a staircase area. In this case, the staircase area corresponds to the area registered in advance by the user.

  The control unit 11 does not execute the main measurement process (S160) until it determines that the mobile device 10 exists in the stair area based on the position information from the GPS receiver 18 and the map, and determines that the mobile device 10 exists in the stair area. Then (Yes in S155), the main measurement process (S160) is executed.

  The weight measuring system 1 of the present embodiment has the same configuration as that of the first embodiment except for the above points. In FIG. 9, in the steps to which the same step numbers as in the first embodiment are attached, the same processing as in the first embodiment is executed.

  As described above, the control unit 11 of the present embodiment detects that the user is located in the area where the stairs exist based on the position information of the mobile device 10 obtained from the GPS receiver 18, and when the user descends the stairs. Acceleration data is acquired from the acceleration sensor 13 (S620). According to the present embodiment, if the user inputs a weight measurement start instruction to the mobile device 10 in advance, the user can move down the stairs in everyday life without performing the stairs down motion on the spot. It is very convenient because the portable device 10 can calculate the weight measurement value based on the above.

In addition, the mobile device 10 according to the first and second embodiments may be configured to execute the above-described measurement display process in cooperation with the server device 30 as illustrated in FIG. 10.
[Third embodiment]
In the weight measurement system 3 of the third embodiment shown in FIG. 10, the portable device 10 provides the server device 30 with information necessary for calculating the weight measurement value, obtains the information of the weight measurement value from the server device 30, and calculates the weight. It is configured to display the measurement value.

  Specifically, the control unit 11 of the mobile device 10 transmits the initial weight information obtained from the user through the operation unit 16 to the server device 30 through the communication unit 19, and further, based on the input signal from the acceleration sensor 13. The acceleration data can be transmitted to the server device 30.

  The server device 30 calculates the correction amount C based on the initial weight information and the acceleration data received from the mobile device 10 in the same procedure as the correction amount determination process (see FIG. 4), and the information on the correction amount C is calculated. Can be transmitted to the mobile device 10. As another example, the server device 30 can store the correction amount C in the own device in association with the mobile device 10 without transmitting the correction amount C to the mobile device 10.

  When a signal instructing the start of weight measurement is input through the operation unit 16, the control unit 11 of the mobile device 10 transmits acceleration data based on the input signal from the acceleration sensor 13 to the server device 30 together with the correction amount C. can do. However, according to the another example in which the server device 30 stores the correction amount C, it is not necessary to exchange the correction amount C between the server device 30 and the mobile device 10.

  Based on the acceleration data and the correction amount C, the server device 30 calculates a representative value of the weight y in the same procedure as the main measurement process (FIG. 8), and uses this representative value as the weight measurement value. Can be sent to. The above-described processing in the server device 30 is realized by the calculation unit 31 of the server device 30 executing the processing according to the program stored in the storage unit 33.

  The control unit 11 of the mobile device 10 can display the weight measurement value received from the server device 30 through the communication unit 19 on the display 15. Further, this weight measurement value can be recorded in a log file and stored in the storage unit 12. However, this log file may be managed by the server device 30.

  The weight measurement system 3 of the present embodiment can be configured in the same manner as the weight measurement system 1 of the first embodiment or the second embodiment, except for the points described above. As in the present embodiment, the weight measurement system 3 in which the measurement display process is realized by the cooperation of the mobile device 10 and the server device 30 can also obtain the same effect as that of the above-described embodiment. The mobile device 10 can communicate with the server device 30 through the Internet, for example.

[Other Embodiments]
The present disclosure is not limited to the above-described embodiments, and can take various aspects. For example, the standard function f(x) and the corrected function g(x)=f(x)+C may be defined by a cubic function or a higher-order polynomial function as shown in FIG. May be done. Also in FIG. 11, the points corresponding to the combinations of the acceleration change width x and the body weight y obtained from the subjects having a body weight of 40 kg to 80 kg are plotted, and the approximate function thereof is represented by a thick solid line. The standard function f(x) shown in FIG. 11 can be used for an acceleration change width of x=7 or more corresponding to a body weight of 40 kg. The standard function f(x) may be used within a range up to x=15 corresponding to a body weight of 80 kg.

  The functions f(x) and g(x) may be defined using a logarithmic function, as shown in FIG. According to the example shown in FIG. 12, the logarithmic function is the natural logarithm ln(x) whose base is the Napier number e. However, the functions f(x) and g(x) may be defined by using a logarithmic function whose base is another value. Also in FIG. 12, points corresponding to the combinations of the acceleration change width x and the body weight y obtained from the subjects having a body weight of 40 kg to 80 kg are plotted, and the approximation function thereof is represented by a thick solid line. The standard function f(x) shown in FIG. 12 can be used for an acceleration change width of x=3 or more corresponding to a body weight of 40 kg. The standard function f(x) may be used within a range up to x=6 corresponding to a body weight of 80 kg.

  The functions f(x) and g(x) may be defined using an exponential function, as shown in FIG. According to the example shown in FIG. 13, the base of the exponential function is the Napier number e. However, the functions f(x) and g(x) may be defined by an exponential function with other values as the base. The designer can determine the standard function f(x) using an appropriate function according to the correlation between the acceleration change width x and the weight y. Also in FIG. 13, the points corresponding to the combinations of the acceleration change width x and the body weight y obtained from the subjects having a body weight of 40 kg to 80 kg are plotted, and the approximate function thereof is represented by a thick solid line. The standard function f(x) shown in FIG. 13 can be used for an acceleration change width of x=6 or more corresponding to a body weight of 40 kg. The standard function f(x) may be used within a range up to x=14 corresponding to a body weight of 80 kg.

  In addition, a table may be used instead of the standard function f(x). That is, instead of the standard function f(x), the designer may create a table showing the correspondence between the acceleration change width x and the weight y at each step interval Ts. The table for each step interval Ts can be installed in the portable device 10 together with the measurement program as auxiliary data of the measurement program. These tables may be stored in the storage unit 12.

  In the above-described embodiment, as the characteristic amount related to the change in the acceleration of the user, the information on the step interval Ts and the width of the change in the acceleration x is obtained from the acceleration data, and the weight y of the user is calculated. However, the characteristic amount relating to the acceleration change is not limited to this example. The feature amount may be a scalar amount or a vector amount. The feature amount may be, for example, a vector expression of a frequency spectrum obtained by frequency-analyzing the acceleration data, or a vector expression of acceleration time series data.

  Further, combination data of acceleration data and weight of a large number of subjects may be prepared as teacher data, and a classifier or classifier that outputs weight in response to input of acceleration data by machine learning may be configured. In this case, the acceleration data itself can be used as a feature vector representing a feature related to a change in acceleration. In this case, the control unit 11 does not need to execute the correction amount determination process. The control unit 11 does not execute S110, S120, S640, and S650, and in S660, the acceleration data for a certain period can be input to the discriminator or the classifier as the feature vector of the acceleration change to obtain the weight y.

  In addition, in the above embodiment, the gait of the user is indirectly determined by the step interval Ts and the standard function f(x) used to calculate the weight y is selected, but the gait determination is performed by another method. You may break. The gait referred to here means the condition when walking, and "walking" includes running. Gait may be understood as how to move a foot. For example, the jerk may be determined by extracting the jerk obtained by differentiating the acceleration data as a parameter related to the gait. Gait may be determined by identifying a waveform pattern of acceleration.

  The weight measurement systems 1 and 3 of the above-described embodiment are systems that measure the weight of a person, but the technique of the present disclosure can be applied to a system that measures the weight of a living body such as another animal. Examples of animals include quadrupeds such as dogs and cats.

  The measurement program may be provided by being stored in a computer-readable non-transitional substantive recording medium. The measurement program may be installed in the storage unit 12 from the time of shipment of the mobile device 10, or may be provided to the mobile device 10 through an electric communication line such as the Internet. The measurement display processing executed by the control unit 11 may be realized by a dedicated hardware circuit.

  The function of one constituent element in the above-described embodiment may be distributed to a plurality of constituent elements. Functions of a plurality of components may be integrated into one component. Part of the configuration of the above embodiment may be omitted. At least a part of the configurations of the above-described embodiments may be added or replaced with respect to the configurations of the other above-described embodiments. All aspects included in the technical idea specified by the wording of the claims are embodiments of the present disclosure.

[Correspondence]
The correspondence between terms is as follows. The processes of S155 and S620 executed by the control unit 11 correspond to an example of the process realized by the acquisition unit, and the processes of S160 and S170 executed by the control unit 11 correspond to an example of the process realized by the output unit. To do. The process of S120 executed by the control unit 11 corresponds to an example of the process realized by the derivation unit.

1, 3... Weight measurement system, 10... Portable device, 11... Control unit, 12... Storage unit, 13... Acceleration sensor, 15... Display, 16... Operation unit, 18... GPS receiver 19... Communication unit, 30... Server Device, 31... Arithmetic unit, 33... Storage unit, 111... CPU, 115... RAM.

Claims (11)

An acquisition unit configured to acquire acceleration information when the living body is walking from the acceleration sensor,
The weight of the living body is specified based on the acceleration information acquired by the acquisition unit according to a predetermined correspondence relationship between a feature amount and a weight related to a change in acceleration per step of the living body when the living body is walking. Then, the specified weight, an output unit configured to output as the weight information of the living body,
Equipped with
The output unit is
A cycle length calculation process for calculating a cycle length, which is a time length per cycle in the cycle fluctuation of the acceleration, from the cycle fluctuation of the plurality of cycles of the acceleration indicated by the acceleration information,
Based on the acceleration information, a feature amount calculation process of calculating, as the feature amount, the amount of change in the acceleration per period in the periodic fluctuation of the acceleration caused by walking of the living body,
A weight identifying process for identifying the weight corresponding to the calculated feature amount according to the correspondence relationship;
An output process of outputting the identified weight as weight information of the living body,
Is configured to run
The correspondence is defined by a function capable of calculating the weight from the characteristic amount,
The function is defined for each period length,
Each of the functions is a function defined by function fitting for the combination of the feature amount and the weight for each living body shown by the sample data relating to the walking of a plurality of living bodies in which the corresponding cycle length is observed,
Wherein the weight specific process, using the function corresponding to the period length calculated by the period length calculating process, the weight weight Ru is calculated information associated with the feature amount calculated by the feature quantity calculation process Output system.   The weight information output system according to claim 1, wherein in the cycle length calculation process, the cycle length is calculated as an average value of a time length of each cycle in a cycle variation of a plurality of cycles of the acceleration. Acquiring information on the initial weight of the living body, further, acquiring the acceleration information of the living body when the living body is the initial weight, based on the acquired information about the initial weight and the acceleration information, Further comprising a correction unit configured to correct the function ,
The weight information output system according to claim 1 or 2, wherein in the weight identification processing, the weight is calculated using the function corresponding to the calculated cycle length after being corrected by the correction unit . The living body is a person,
Each of the functions is defined as a function capable of calculating the weight from the characteristic amount when the person goes up and down stairs based on the sample data,
The weight information output system according to claim 1, wherein the acquisition unit acquires, as the acceleration information, acceleration information when the person goes up and down stairs from the acceleration sensor.   When the person moves up and down the stairs by detecting that the person is located in an area preset as an area where stairs exist, based on the position information of the person obtained from a position detector. The weight information output system according to claim 4, wherein the acceleration information of the vehicle is acquired from the acceleration sensor.   An acquisition unit configured to acquire the acceleration information of the person from the acceleration sensor,
  A weight specified from a predetermined correspondence between a characteristic amount relating to an acceleration change and a weight, which corresponds to a characteristic amount relating to the acceleration change of the person specified from the acceleration information acquired by the acquisition unit. An output unit configured to output the weight as the weight information of the person,
  Equipped with
  The correspondence relationship indicates a relationship between the characteristic amount and the weight when the person goes up and down stairs,
  The acquisition unit, based on the position information of the person obtained from the position detector, detects that the person is located in an area preset as an area where stairs exist, and as the acceleration information, the person is A weight information output system that acquires acceleration information when going up and down stairs from the acceleration sensor. The weight information output system according to claim 6 , wherein the output unit stores the correspondence relationship in the form of a table or a function. A procedure for acquiring the acceleration information when the living body is walking from the acceleration sensor,
The weight of the living body, based on the acquired acceleration information, a procedure of specifying according to a predetermined correspondence relationship between the feature amount and the weight related to the acceleration change per step of the living body when the living body is walking,
A step of outputting the specified weight as weight information of the living body;
A program for causing a computer to execute,
The identification procedure is
A procedure of calculating a cycle length, which is a time length per cycle in the cycle fluctuation of the acceleration, from a cycle fluctuation of a plurality of cycles of the acceleration indicated by the acceleration information,
Based on the acceleration information, a procedure of calculating the amount of change in the acceleration per cycle in the periodic fluctuation of the acceleration caused by walking of the living body as the feature amount,
Including,
The correspondence is defined by a function capable of calculating the weight from the characteristic amount,
The function is defined for each period length,
Each of the functions is a function defined by function fitting for the combination of the feature amount and the weight for each living body shown by the sample data relating to the walking of a plurality of living bodies in which the corresponding cycle length is observed,
In the specifying procedure, the weight is specified by calculating the weight corresponding to the calculated feature amount using the function corresponding to the calculated cycle length .   9. The program according to claim 8, wherein in the procedure of calculating the cycle length, the cycle length is calculated as an average value of the time length of each cycle in the cycle fluctuation of the acceleration for a plurality of cycles.   Acquiring information on the initial weight of the living body, further, acquiring the acceleration information of the living body when the living body is the initial weight, based on the acquired information about the initial weight and the acceleration information, Procedure to correct function
  Is further executed by the computer,
  In the identifying procedure, the weight corresponding to the calculated feature amount is calculated by using the function corresponding to the calculated cycle length after the correction by the correcting procedure, The program according to claim 8 or 9, for causing the computer to execute a process of specifying a weight.   A procedure to acquire the acceleration information of a person from the acceleration sensor,
  A procedure of calculating a feature amount related to the acceleration change of the person based on the acceleration information;
  According to a predetermined correspondence relationship between the characteristic amount and the weight when the person goes up and down stairs, a procedure for identifying the weight corresponding to the calculated characteristic amount,
  A step of outputting the identified weight as weight information of the person,
  To the computer,
  In the acquisition procedure, based on the position information of the person obtained from the position detector, it is detected that the person is located in an area preset as an area where stairs exist, and the acceleration information is stored as the person. A program for causing the computer to execute a process of acquiring acceleration information from the acceleration sensor when a person goes up and down stairs.