JP2005172625A - Behavior detection device - Google Patents

Abstract

An object of the present invention is to provide a behavior detection device capable of dynamically correcting acceleration data and more accurately detecting a wearer's behavior when the mounting position changes after the behavior detection device is mounted. .
A behavior detection apparatus 100 includes an acceleration sensing unit 401 that collects data representing each acceleration and outputs the data to an evaluation unit 402, an evaluation unit 402 that determines a wearer's behavior and posture, and shifts between a device and a mounting surface. A movement amount detection unit 403 that detects a movement amount when a problem occurs, and a correction that corrects acceleration data using a detected rotation angle while correcting a parameter used to determine an action or posture corresponding to the mounting position Unit 404, parameter storage unit 405 for storing information about parameters, movement amount determination unit 406 that determines a rotation angle from the result detected by movement amount detection unit 403 and transmits the rotation angle to correction unit 404, and wearing state for the wearer A mounting detection unit 407 is provided.
[Selection] Figure 4

Description

  The present invention relates to a behavior detection device that detects the behavior and posture of a moving object, and more particularly to a behavior detection device that can accurately detect a behavior even when the mounting position of the device is shifted after mounting.

  In the background of the arrival of an aging society in recent years, nursing care for elderly people has attracted attention. In particular, accurately grasping the behavior of elderly people and patients with dementia is regarded as very important in providing care, and various techniques have been proposed. Furthermore, if the behavior of these elderly people is tracked and abnormal behavior is performed, means for reporting the situation to the person or the caregiver is considered indispensable from the viewpoint of care. Also, if you can understand the behavior pattern by measuring and analyzing the behavior and posture of people, not just elderly people, you can perform more comfortable control and safe operation of lighting and air conditioning. It is possible to improve the living environment.

  And it is effective to measure an action, an action, etc. not only in humans but also in animals and machines. For example, in the case of animals, it can be used for ecological research that has not been understood until now, and in the case of machines, if the state and movement can be measured, it can be operated efficiently and safely, and production activities can be performed. It is very effective from the viewpoint of the above.

By the way, as a method for detecting a motion and a posture, a method for discriminating a stationary state and a motion state using a pedometer, a mercury switch or the like has been proposed in the past. Recently, various high-performance acceleration sensors and gyro sensors (angular acceleration sensors) have been developed, and devices and methods for detecting a walking state, body tilt, walking direction, etc. using them have been proposed (for example, Patent Document 1). In Patent Document 1, a system for obtaining a human state in consideration of a human physiological state is disclosed.
JP 2002-119485 A

  However, for example, when the behavior detecting device is used continuously for a long time or when the wearer changes the behavior or posture while wearing the device, it is often the case that the mounting position of the behavior detecting device is shifted. Are expected to occur. As described above, in the case where the position of the behavior detecting device is shifted during the behavior of the wearer or during the posture change, the above-described conventional device for evaluating the behavior and posture has the accuracy of detecting the behavior and posture. There is a problem of gradually lowering.

  Accordingly, the present invention has been made in view of the above problems, and provides an action detection device capable of accurately determining the action and posture of a moving object even when the mounting position changes after the apparatus is mounted on the moving object. The purpose is to do.

In order to achieve the object, an action detection apparatus according to the present invention is [Claim 1].
Therefore, the behavior detecting device can correct the acceleration data measured by the acceleration measuring unit in the correcting unit by detecting the movement amount and the rotation angle of the device. Even when the position changes, the acceleration data can be measured accurately.

The behavior detection apparatus according to the present invention is [Claim 3], more preferably [Claim 4].
Therefore, in the action detection device of the present invention, the first rotation angle and the second rotation angle are detected by the rotation angle detection means, and the trigonometric acceleration data is calculated by the correction means using the value of the trigonometric function into which these are substituted. Therefore, more accurate acceleration data can be detected, and the behavior and posture of the moving object can be detected with higher accuracy.

Furthermore, the action detection apparatus according to the present invention is [Claim 8].
Therefore, the behavior detection device according to the present invention detects the time of wearing by the wearing detection means and performs correction from that point, so that the behavior can be detected more accurately.
In order to achieve the above object, the present invention can be realized as a behavior detection method using characteristic constituent means of the behavior detection apparatus as steps, or as a program including all these steps. The program is not only stored in a ROM or the like included in the behavior detection device, but can also be distributed via a recording medium such as a CD-ROM or a communication network.

  As is clear from the above description, in the behavior detection device according to the present invention, even when a displacement of the wearing position occurs after wearing, the correction unit can appropriately correct the acceleration data, It is possible to reduce misjudgment when measuring the behavior and posture using the acceleration sensor, and to detect the behavior with higher accuracy.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
First, the behavior detection apparatus according to the first embodiment will be described. Note that this behavior detection device is characterized in that even when the device is misaligned after being mounted, the acceleration data can be corrected appropriately to perform behavior detection with higher accuracy.

  FIG. 1 is an external view of the behavior detection apparatus 100 according to the first embodiment. This behavior detection device 100 is a device for specifying the behavior and posture of a person wearing this device (hereinafter referred to as “wearer”) using a built-in acceleration sensor. The behavior detecting device 100 has a slightly thin rectangular parallelepiped shape (for example, 5 cm (vertical) × 8 cm (horizontal) × 1.5 cm (thickness)) of a business card size, and includes a liquid crystal panel 102, a speaker 104, and an LED 105. It has.

Note that the behavior detection apparatus 100 includes a fixing band 106 that is attached to a human body by being fixed through a belt, for example.
The liquid crystal panel 102 displays a history of error correction and error messages. Here, “parameter correction” refers to the relationship between the direction of each acceleration sensor built in the behavior detection apparatus 100 and the reference direction for the wearer (for example, the front direction is the reference direction for the wearer). To clarify. Therefore, it is necessary to perform the correction every time the mounting position of the behavior detection device 100 changes.

  The speaker 104 outputs a sound for issuing a warning when the mounting position largely fluctuates from the initial state. In addition to this, it is also possible to output a sound prompting re-mounting.

Next, the processing unit for detecting the movement amount in the behavior detection apparatus 100 will be described.
FIG. 2 is a view of the behavior detection apparatus 100 in FIG. 1 as viewed from the back. In FIG. 2A, an LED 202 and a CCD element 201 are provided on the surface of the behavior detection device 100 attached to the human body.

  The CCD element 201 always captures an image of the mounting surface on the human body, and the LED 202 is arranged to irradiate the imaging surface in order to keep the brightness of the imaging surface of the CCD element 201 constant. Therefore, the LED 202 can irradiate the imaging surface of the CCD element 201 and perform image processing accurately even under the condition that no external light is incident upon mounting. Then, the CCD element 201 finds a feature point that is microscopically uneven on the surface, and detects the amount of movement of this feature point. The movement amount detection method using the CCD element 201 and the LED 202 is a general method used as a mouse used in a PC, for example.

  Further, when the human body wears the action detection device 100 and performs activities as it is, the device is shifted in the horizontal direction, the vertical direction, or the rotation direction with respect to the initial wearing surface due to a rapid movement or long-term wearing. It is predicted that this can happen. Therefore, in the behavior detection apparatus 100 according to the first embodiment, the CCD element 201 always captures an image of the mounting surface on the human body, performs image processing by the CPU built in the apparatus, and sequentially moves the behavior detection apparatus 100. A movement amount such as a direction, a movement distance, a rotation direction, and a rotation angle is determined. Based on the result, various parameters as described later are dynamically corrected, and the posture of the human body is always determined based on the correct parameters based on the wearing state.

  If the above-described correction is performed after detecting the wearing of the behavior detecting device 100, erroneous detection due to the influence of ambient light when the behavior detecting device 100 is not worn can be prevented. For this reason, as shown in FIG. 2B, the distance sensor 203 is provided on the back surface of the behavior detection device 100 together with the LED 202 and the CCD element 201, and the approach to the human body is detected by the distance sensor 203 to detect the behavior. The CPU incorporated in the device 100 determines that the device is mounted. In this way, the movement amount detection unit 403 performs correction after it is determined that the behavior detection device 100 is attached. Further, if it is determined that the behavior detection device 100 is attached at this time, the power of the CCD element 201 and the LED 202 is turned on, and if it is not determined that the action is detected, the power is controlled so that the power is not turned on. Therefore, it is preferable that the power consumption can be suppressed, and the behavior detection device 100 can be downsized and driven for a long time.

  Moreover, FIG.2 (c) is the figure which looked at the action detection apparatus 100 from the back surface. Two CCD elements 201 are provided on the surface of the behavior detection device 100 attached to the human body. Each CCD element 201 exists at a point-symmetrical position with respect to the center point A of the behavior detection apparatus 100. The CCD element 201 is preferably arranged at a position as far as possible from the center point A of the apparatus.

  When the human body wears the behavior detection device 100 and performs the activity as it is, and the device is displaced in the rotation direction of the behavior detection device 100, the rotation angle can be detected by the configuration of FIG. First, each movement vector (direction of movement trajectory in a predetermined unit time) detected by each of the two equipped CCD elements 201 is determined. When they are directed in the opposite vector direction, the behavior detection apparatus 100 is rotated around the center point A with respect to the human body wearing surface. Based on this determination information, it is possible to correct the acceleration output by detecting a device deviation in the rotational direction at the time of wearing.

  Here, the optical CCD element 201 is used as means for detecting the movement amount, but it is also conceivable to use a rotary encoder or the like that detects a dynamic physical quantity. In this case, a rotary encoder is arranged at a right angle, and a sphere having a high friction coefficient is arranged at the center of the rotary encoder at a position where it contacts the human body. If the mounting position changes, the sphere rotates, and the amount of movement is detected by rotating the rotary encoder according to the rotation direction.

FIG. 3 is a diagram showing a configuration example of the acceleration sensor 300 built in the behavior detection apparatus 100 in FIG. As shown in FIG. 3, the acceleration sensor 300 enables detection of triaxial acceleration by using two biaxial acceleration sensors 303 and 304.
A circuit board 302 is fixed at a position perpendicular to the circuit board 301, and an IC type acceleration sensor 303 and an acceleration sensor 304 having the same specifications are arranged on each board. For example, the acceleration sensor 303 detects the X-axis and Y-axis accelerations, and the acceleration sensor 304 detects the Z-axis acceleration. Therefore, as shown in FIG. 3, the acceleration sensor 304 does not use the output of one axis that is the axis indicated by the broken line.

FIG. 4 is a block diagram illustrating a functional configuration of the behavior detection apparatus 100 according to the first embodiment. As illustrated in FIG. 4, the behavior detection apparatus 100 includes an acceleration sensing unit 401, an evaluation unit 402, a movement amount detection unit 403, a correction unit 404, a parameter storage unit 405, a movement amount determination unit 406, and a mounting detection unit 407. I have.
The acceleration sensing unit 401 includes an acceleration sensor 300, collects data representing each acceleration in the left-right direction, the front-rear direction, and the up-down direction in the wearer's behavior and posture and outputs the collected data to the correction unit 404 and the like.

  The evaluation unit 402 determines the current behavior and posture of the wearer from a pattern in which acceleration in each direction changes. In the determination, for example, when “a pattern having a large amplitude of a certain period or more in a certain period appears in the acceleration data in the vertical direction”, it is determined to be “walking” and “instantaneously large without periodicity”. If the amplitude change appears in the acceleration data in the vertical direction and in the longitudinal direction, and then there is no significant change in the acceleration data in each direction for a certain period of time, then it is determined that there is an action of “sitting” or “standing up” It is. Here, in the determination, in order to improve the determination accuracy, it is necessary to correct a parameter according to an actual mounting position with respect to a predetermined determination criterion.

The movement amount detection unit 403 is a part corresponding to the CCD element 201 in FIG. 2, and detects a movement direction, a movement distance, a rotation direction, and a rotation angle, which are movement amounts, when a deviation occurs between the device and the mounting surface.
The movement amount determination unit 406 determines a mounting position and a mounting angle from the result detected by the movement amount detection unit 403, and transmits these pieces of information to the correction unit 404.
When the correction unit 404 receives information representing the mounting position from the movement amount determination unit 406, the correction unit 404 corrects the parameters used for determining the behavior and posture corresponding to the mounting position, and outputs them to the evaluation unit 402. Further, using the rotation angle determined by the movement amount determination unit 406, the component force of the acceleration data detected in each direction detected by the acceleration sensing unit 401 is calculated, and the sum of each component force is calculated and corrected. Calculate acceleration.

The parameter storage unit 405 is a storage device configured by a RAM or the like, and stores parameters used by the evaluation unit 402 and information related to the parameters.
The wearing detection unit 407 includes a distance sensor 203 and detects ON / OFF of the wearing state of the behavior detecting device 100 to the wearer.
Although not shown in FIG. 4, it goes without saying that the behavior detection apparatus 100 includes a CPU that is a control unit that controls processing timing and the like in each unit, for example, a ROM, a RAM, and the like.

Next, directional axis parameters according to the first embodiment will be described. FIG. 5 is a diagram illustrating a state where the wearer 500 wears the behavior detection device 100 on the “left waist”. Thus, when the wearer 500 wears the behavior detection device 100 on the left waist, the X axis of the acceleration sensor represents the left-right direction, the Y axis represents the front-rear direction, and the Z axis represents the up-down direction.
In the present invention, when a displacement of the device is detected by the movement amount detection unit 403, an acceleration correction calculation in the X-axis direction, the Y-axis direction, and the Z-axis direction is performed accordingly.

FIG. 6 is a flowchart showing an overall operation procedure of posture detection apparatus 100 according to the first embodiment.
First, in the behavior detection apparatus 100, the wearing detection unit 407 determines whether or not the wearer has worn it (S601).
When the attachment detection unit 407 detects the attachment (Y in S601), power is turned on to other processing units such as the movement amount detection unit 403 and the movement amount determination unit 406, and the correction unit is activated. (S602).

  Next, the movement amount detection unit 403 detects the movement amount. For example, when the movement amount detected by the movement amount detection unit 403 reaches a predetermined threshold value, correction by the correction unit 404 is necessary. If the movement amount determination unit 406 determines that the acceleration correction calculation is necessary due to device deviation or the like (Y in S603), the correction unit 404 corrects the sensor parameter. (S604). The sensor parameter correction is described with reference to FIGS. 7 to 10 described later, but is performed by detecting the rotation angle of the behavior detection device 100 and calculating the component force of acceleration data in each axial direction.

  Finally, the correction of the directional axis is passed to the evaluation unit 402 to evaluate the behavior, and the acceleration sensing unit 401 continues to collect acceleration data detected in the acceleration sensing unit 401 (S605), and a series of processing until the end of the behavior detection I do.

FIG. 7 is a diagram illustrating a state in which the wearer wears the behavior detection device 100.
7A shows a state in which the wearer wears the behavior detection device 100 on the right waist. In the acceleration sensor 300 in FIG. 3, the X axis is the left-right direction, the Y axis is the front-rear direction, and the Z-axis. Each axis represents the vertical direction. Assuming that this state is the initial wearing state, if the wearing is continued for a long time, the wearing angle of the behavior detecting device 100 may be rotated about the left and right axis of the body. For example, assuming that the device is rotated by 45 ° in the direction opposite to the clockwise direction with respect to the left and right axes of the body as an example of the rotation, the wearing state at that time is shown in FIG. .

  In addition, the other graphs shown to the right of FIGS. 7A and 7B show the acceleration outputs of the X axis, the Y axis, and the Z axis in the acceleration sensor 300 when walking in the forward direction in each wearing state. Show. As can be seen from this figure, when the behavior detection device 100 is in the state shown in FIG. 7B with respect to the human body wearing surface, the acceleration sensing unit 401 applies the forward propulsive force associated with walking. As reflected, acceleration components in the front-rear direction are detected on both the Y-axis and the Z-axis, and the Y-axis fluctuation absolute value becomes small.

  For this reason, if the acceleration component in the front-rear direction is evaluated assuming that the wearing state maintains the state of FIG. 7B, an incorrect acceleration is evaluated. For example, when it is desired to evaluate the acceleration accompanying forward propulsion as one evaluation element of the walking state, it is not possible to correctly determine when the acceleration sensing unit 401 evaluates only the acceleration of the Y axis. .

  Therefore, the behavior detection apparatus 100 according to the present invention corrects acceleration data as shown in FIG. FIG. 8 is a diagram illustrating an example of a method for correcting acceleration data in the correction unit 404 of the behavior detection apparatus 100. The correction unit 404 calculates the rotation angle in the vertical direction including the center point A of the behavior detection device 100, calculates the component force in the axial direction, and calculates the sum of the calculated component forces.

  The behavior detection apparatus 100 illustrated in FIG. 8 has the configuration of the back surface of FIG. 2C, and the movement amount determination unit 406 detects a rotation angle rotated with respect to the vertical direction of the body. Therefore, even when the wearing position changes, the correction unit 404 can correct and calculate the acceleration in the front-rear direction of the wearer to the correct acceleration by the following relational expression (Equation 1) based on the detected rotation angle.

(Equation 1)
Longitudinal acceleration = (Detected acceleration on Z axis × SINα °) + (Detected acceleration on Y axis × SINα °)
Here, α is the terminal rotation angle in the vertical direction including the center point A, as shown in FIG.
By passing the acceleration in the longitudinal direction of the human body corrected and calculated by the correction unit 404 to the evaluation unit 402 in this way, the evaluation unit 402 can correctly evaluate the motion related to the acceleration in the longitudinal direction.

FIG. 9 shows a top view when the wearer wears the behavior detection device 100.
9A shows a case where the wearer wears the behavior detection device 100 on the right waist. In the acceleration sensor 300 in FIG. 3, the X axis is the left-right direction, the Y axis is the front-rear direction, The Z axis represents the vertical direction. Assuming that this state is the initial wearing state, when the wearing is continued for a long period of time, the wearing position of the behavior detecting device 100 may be rotated with the position shifted about the body axis of the human body. As an example of such a rotation, a case where the behavior detection device 100 is rotated by 45 ° to the right with respect to the front direction of the human body is considered, and the wearing state at that time is shown in FIG.

  9A and 9B show acceleration outputs from the X-axis, Y-axis, and Z-axis acceleration sensors 300 when walking forward. As can be seen from this figure, when the action detection device 100 is in the state shown in FIG. 9B with respect to the human body wearing surface, the acceleration in the front-rear direction that reflects the forward driving force associated with walking is shown. The component is detected on both the Y-axis and the X-axis, and the fluctuation absolute value on the Y-axis becomes small.

  For this reason, when evaluating the acceleration component in the front-rear direction assuming that the wearing state maintains the state shown in FIG. 9B, the evaluation unit 402 has evaluated the wrong acceleration. For example, when it is desired to evaluate the acceleration accompanying forward propulsion as one evaluation element of the walking state, it cannot be determined correctly when only the acceleration on the Y axis is evaluated.

Therefore, the acceleration data is corrected as shown in FIG. FIG. 10 is a diagram illustrating an example of a method for correcting acceleration data in the correction unit 404 of the behavior detection apparatus 100.
In the behavior detection device 100 illustrated in FIG. 10, the movement amount determination unit 406 detects a movement distance indicating how much the behavior detection device 100 has moved relative to the body. Further, the waist circumference of the human body is measured in advance and input to the behavior detection apparatus 100. For example, based on this moving distance, the wearer's longitudinal acceleration can be calculated by the following relational expression (Equation 2), and the correction unit 404 corrects the acceleration data using this expression to always act. The correct longitudinal acceleration in the detection device 100 can be detected.

(Equation 2)
Longitudinal acceleration = (Detected acceleration on Z axis × SINβ °) + (Detected acceleration on Y axis × SINβ °)
Here, as shown in FIG. 10, β is a horizontal rotation angle including the center point A.
When the human body is assumed to be a cylinder, the following relational expression is established for the amount of movement between the waist and the terminal.

(Equation 3)
Angle derived from body axis with terminal movement = 360 ° x (terminal movement distance / waist circumference)
By using these (Equation 2) and (Equation 3), it is possible to calculate the acceleration in the body longitudinal direction in the acceleration sensing unit 401 taking into account the angle generated with respect to the body axis as the terminal moves. it can.

Furthermore, by passing the acceleration in the longitudinal direction of the body calculated in this way to the evaluation unit 402, it becomes possible to correctly evaluate the motion related to the acceleration in the longitudinal direction. In the description of FIGS. 7 to 10, the correction of the acceleration data in the front-rear direction has been described. However, the acceleration in the vertical direction and the horizontal direction can be obtained similarly.
FIG. 11 is a flowchart showing a procedure of correction calculation of acceleration data in the behavior detection apparatus 100 according to the first embodiment.

First, the acceleration sensing unit 401 detects accelerations in the X-axis direction, the Y-axis direction, and the Z-axis direction (S1101).
Next, the movement amount determination unit 406 detects the rotation angle in the vertical direction and the horizontal direction including the center point using the information on the movement amount detected by the movement amount detection unit 402 (S1102).
Then, the correction unit 404 substitutes the acceleration data acquired from the acceleration sensing unit 401, the rotation angle detected from the movement amount determination unit 406, and the above-described equations 1 to 3 to calculate the sum of the component forces. Later new acceleration data can be acquired (S1103).

As described above, the behavior detection apparatus 100 according to the first embodiment detects the rotation angle including the center point A of the apparatus 100 using the movement amount detection unit 403 that detects the movement amount and the information on the movement amount. And a correction unit 404 that performs correction calculation of acceleration data in the directions of the three axes using information on the rotation angle.
Therefore, even when the wearing position is displaced due to the action of the wearer of the behavior detection device 100 after wearing, the correction unit 404 performs correction calculation of acceleration data and collects accurate acceleration data. In the evaluation unit 402, it becomes possible to detect the behavior and the posture more accurately.

In addition, since the behavior detection apparatus 100 according to the first embodiment includes the mounting detection unit 407 that detects the initial mounting state, the movement amount detection unit 403 detects the movement amount after accurately detecting the start of mounting. Therefore, it is possible to effectively prevent erroneous detection of the movement amount and erroneous correction in the correction unit 404.
In the description of the first embodiment, the correction unit 404 calculates the component force of the acceleration data in the three-axis directions using the rotation angle information determined by the movement amount determination unit 406. However, the correction in is not limited to this. For example, the correction unit 404 can be considered to rotationally correct the direction axis parameters themselves of the acceleration sensors 303 and 304 using information on the rotation angle.

(Embodiment 2)
Next, the behavior detection apparatus according to the second embodiment will be described.
FIG. 12 is an external view of the behavior detection apparatus 100 according to the second embodiment.
This behavior detection device 100 includes buttons 1201 in addition to the configuration of the first embodiment.
The buttons 1201 are buttons pressed by the wearer or the user (caregiver) in order to determine the position where the behavior detection device 100 is worn. For example, when the behavior detection device 100 is worn on the left waist of the wearer, the “left” button is pressed. Similarly, the right button when worn on the wearer's right waist, the front button when worn on the wearer's abdomen, and the back button when worn on the lower back of the wearer Each button is pressed.

The liquid crystal panel 102 displays a history of corrected parameters, an operation mode, and an error message. Here, a correction trigger button can be further provided, and a correction period can be explicitly set to correct the parameters.
FIG. 13 is a block diagram illustrating a functional configuration of the behavior detection apparatus 100 according to the second embodiment. As illustrated in FIG. 13, the behavior detection device 100 includes a mounting position selection unit 1301 in addition to the configuration of the behavior detection device 100 of the first embodiment.

The wearing position selection unit 1301 is a processing unit corresponding to the buttons 1201 in FIG. 12, and includes a plurality of button switches associated with a plurality of wearing position candidates, and after the wearer or the like determines the wearing position. The pressing of the button switch corresponding to the position is accepted, the mounting position is determined, and information indicating the determined mounting position is transmitted to the correction unit 404.
In addition to the functions shown in FIG. 4, when the correction unit 404 receives information indicating the mounting position from the mounting position selection unit 1301, the correction unit 404 reads out parameters used for determination of behavior and posture corresponding to the mounting position from the parameter storage unit 405. , And a function of outputting to the evaluation unit 402.

  Accordingly, the parameter storage unit 405 also has a function of storing parameters and information related to parameters used when the evaluation unit 402 determines actions and postures at a plurality of mounting position candidates.

Next, parameters in the second embodiment will be described.
FIG. 14 is a diagram illustrating a state where the wearer wears the behavior detection device 100.
As shown in FIG. 14A, when the wearer wears the action detection device 100 on the left waist, the X-axis of the acceleration sensor in FIG. 3 is the left-right direction, the Y-axis is the front-rear direction, and the Z-axis is the up-down direction. Represents each. In this case, when the wearing position of the action detection device 100 is moved by the wearer along the belt to the abdomen, right waist, or back, the directions represented by the X axis and the Y axis of the acceleration sensor change.

  FIG. 14B is a table showing the relationship between the direction axis of each acceleration sensor and the positive and negative directions of acceleration. For example, when the action detection device 100 is attached to the “left waist” as the reference position, the X-axis (left-right direction) acceleration data is positive on the right, negative on the left, and Y-axis (front-rear direction). For acceleration data, the front is positive and the back is negative, and for the Z-axis (vertical direction) acceleration data, the top is positive and the bottom is negative. Similarly, when the behavior detection device 100 is worn on the abdomen, right waist, or back, the directions indicated by the X axis, the Y axis, and the Z axis are different.

In the behavior detection device 100 according to the second embodiment, the direction of the behavior detection device 100 at the initial stage is selected by the wearer selecting and pressing a button suitable for the mounting position from the buttons 1201 at the time of wearing. It is possible to set the axis accurately.
When the mounting position of the behavior detection device 100 is shifted, the rotation angle is detected to calculate a component force, and the correction unit 404 performs correction calculation of acceleration data in the X-axis, Y-axis, and Z-axis directions as described above. This is the same as the behavior detection apparatus 100 according to the first embodiment.

Next, an operation procedure of the behavior detection apparatus 100 according to the second embodiment will be described.
FIG. 15 is a flowchart showing a flow of overall operation of the behavior detection apparatus 100 according to the second embodiment. The second embodiment is characterized in that the wearing position of the behavior detection device 100 is selected at the time of wearing.
First, it is determined by the wearing detection unit 407 whether or not the action detecting device 100 is worn by the wearer (S1501).

When wearing is detected by the wearing detection unit 407 (Y in S1501), the wearer confirms the wearing position by using the wearing position detection button, and corrects the wearing position selected by the wearing position selection unit 1301. (S1502).
Further, power is turned on for other processes such as the movement amount detection unit 403 and the movement amount determination unit 406, and the correction unit is activated (S1503).
Next, the movement amount detection unit 403 detects the movement amount. For example, when the movement amount detected by the movement amount detection unit 403 reaches a predetermined threshold value, correction by the correction unit 404 is necessary. If the movement amount determination unit 406 determines that the acceleration correction calculation is necessary due to device deviation or the like (Y in S1504), the correction unit 404 corrects the sensor parameter. Is performed (S1505). The correction of the sensor parameter is the same method as in the first embodiment.

Finally, the correction of the direction axis is passed to the evaluation unit 402 to evaluate the behavior and motion, and the acceleration data detected by the acceleration sensing unit 401 is continuously collected (S1506) until the end of the behavior detection. Perform a series of processing.
Note that the behavior detection apparatus 100 may determine in advance a behavior pattern of the wearer at the time of correction, and may include a step of collecting correction acceleration data for this behavior pattern. For example, in this case, the action pattern is determined by performing a correction by determining that the movement is performed in the right direction for 5 seconds after the button switch such as the correction trigger unit is pressed, and the movement is performed in the forward direction for the next 5 seconds. Can do.

As described above, in the behavior detection apparatus 100 according to the second embodiment, the correction unit 404 uses the button pressed by the wearer or the like via the mounting position selection unit 1301 to change the mounting position corresponding to the button. Are read from the parameter storage unit 405 and output to the evaluation unit 402.
Using the acceleration data input from the acceleration sensing unit 401 and the read parameters, the evaluation unit 402 can set the correct direction axis for the wearer's behavior and posture using this as an initial state.

Further, in the behavior detection apparatus 100 according to the second embodiment, even when the mounting position is changed by the behavior of the wearer, the correction unit 404 via the movement amount detection unit 403 and the movement amount determination unit 406. It is possible to evaluate the behavior with higher accuracy in the evaluation unit 402 by dynamically changing the parameters.
The behavior detection apparatus 100 according to the present invention may further include a warning unit that issues a warning to the wearer when the movement amount detection unit 403 detects a movement amount equal to or greater than a predetermined position movement amount. obtain. For this reason, the wearer who has detected a warning from the warning unit can prompt the user to re-attach the behavior detection device 100 to the correct position, and can collect more accurate data.

  Moreover, the action detection apparatus 100 can also be provided with the transmission part which transmits the correction result in the correction | amendment part 404 to another terminal device via a network. And since another terminal device is provided with an evaluation part, it becomes possible to perform a correct evaluation of a wearer's action and operation also in a remote place.

  The behavior detection apparatus according to the present invention can be used by being attached to a moving body such as a patient who needs to detect the behavior and posture, and in particular, a hospital, a clinic, or a home where it is necessary to evaluate the behavior pattern. It is suitable as a posture sensing device used by being attached to a patient internally.

1 is an external view of a behavior detection device according to Embodiment 1. FIG. It is the figure which looked at the action detection apparatus in FIG. 1 from the back. It is a figure which shows the structural example of the acceleration sensor incorporated in the action detection apparatus in FIG. 3 is a block diagram illustrating a functional configuration of the behavior detection device according to Embodiment 1. FIG. It is a figure which shows a mode that the wearer mounted | worn the action detection apparatus to the "left waist". 4 is a flowchart showing an overall operation procedure of the posture detection apparatus according to the first embodiment. The state that the wearer wears the behavior detection device on the right waist is shown. It is a figure which shows an example of the correction method of the acceleration data in the correction | amendment part of an action detection apparatus. It is a figure which shows a mode that the wearer mounted | wore the action detection apparatus. It is a figure which shows an example of the correction method of the acceleration data in the correction | amendment part of an action detection apparatus. 4 is a flowchart showing a procedure for correction calculation of acceleration data in the behavior detection device according to the first embodiment. It is an external view of the action detection apparatus in Embodiment 2. 6 is a block diagram illustrating a functional configuration of a behavior detection device according to Embodiment 2. FIG. It is a figure which shows a mode that the wearer mounted | wore the action detection apparatus. 6 is a flowchart showing a flow of overall operation of the behavior detection apparatus according to the second embodiment.

Explanation of symbols

100 Action Detection Device 102 Liquid Crystal Panel 104 Speaker 105 LED
106 Fixing band 201 CCD element 202 LED
DESCRIPTION OF SYMBOLS 203 Distance sensor 301 Circuit board 302 Circuit board 303 Acceleration sensor 304 Acceleration sensor 401 Acceleration sensing part 402 Evaluation part 403 Movement amount detection part 404 Correction | amendment part 405 Parameter memory | storage part 406 Movement amount determination part 407 Installation detection part 1201 Buttons 1301 Installation position selection Part

Claims (15)

A behavior detection device for detecting the behavior or posture of a moving body wearing itself,
A movement amount detecting means for detecting a movement amount of the mounting position;
A rotation angle detection means for detecting a rotation angle around the center point of the action detection device based on a detection result in the movement amount detection means;
Acceleration measuring means for measuring acceleration data for the moving object;
A behavior detection apparatus comprising: correction means for correcting the measured acceleration data based on a detection result in the rotation angle detection means. The movement amount detection means detects at least one value of a movement direction, a movement distance, and a movement angle between the behavior detection device and the mounting surface of the moving object,
The behavior detection apparatus according to claim 1, wherein the rotation angle detection unit detects the rotation angle using the value. The rotation angle detection means further includes a first rotation angle that is a horizontal rotation angle centered on the center point of the device, and a second rotation angle that is a vertical rotation angle centered on the center point. Detection
The acceleration measuring means measures acceleration data in the three-axis directions of up and down direction, left and right direction, and front and rear direction regarding the action of the moving object,
The behavior detection apparatus according to claim 1, wherein the correction unit corrects the acceleration data in the three-axis directions using a trigonometric function into which the first rotation angle and the second rotation angle are substituted. The correction means further obtains a component force by multiplying a value obtained by substituting the first rotation angle and the second rotation angle into a trigonometric function and the acceleration data in the three axis directions, and adds the component force. The behavior detection apparatus according to claim 3, wherein the correction is performed by: The correction means further performs the correction by rotating directional axis parameters in the three-axis directions in the acceleration measuring means based on a rotation angle detection result in the rotation angle detection means. Item 3. The behavior detection device according to Item 3. The behavior according to claim 3, wherein the rotation angle detection unit determines the first rotation angle based on a movement distance in a horizontal direction detected by a circumference of the moving body and the movement amount detection unit. Detection device. The behavior detection apparatus according to claim 1, wherein the movement amount detection means is at least one of an image processing unit including a CCD element and an LED, or a rotary encoder. The behavior detection device further includes:
Equipped with an attachment detection means for detecting attachment to the moving object;
The behavior detection device according to claim 1, wherein the movement amount detection unit detects the movement amount after the attachment detection unit detects attachment of the device. The behavior detection apparatus according to claim 8, wherein the wearing detection unit is a distance sensor. The behavior detection device further includes:
An evaluation unit that evaluates the behavior of the moving object based on acceleration data corrected by the correction unit;
The behavior detection apparatus according to claim 1, wherein the evaluation unit evaluates the movement, sitting, and standing motions of the moving body using the acceleration data. The behavior detection device further includes:
An instruction receiving means for receiving an instruction regarding a place where the apparatus is mounted from a user;
The behavior detection apparatus according to claim 1, further comprising: a second correction unit configured to correct a direction axis parameter representing each direction related to the acceleration sensor based on an instruction received by the instruction reception unit. The behavior detection device further includes:
The behavior detection apparatus according to claim 1, further comprising a warning unit that emits a warning sound to the moving body when the movement amount detection unit detects a movement amount equal to or greater than a predetermined movement amount. A behavior detection method for detecting the behavior or posture of a moving object wearing itself,
A movement amount detection step for detecting a movement amount of the mounting position;
A rotation angle detection step for detecting a rotation angle around the center point of the action detection device based on the detection result in the movement amount detection step;
An acceleration measuring step for measuring acceleration data for the moving object;
And a correction step of correcting the measured acceleration data based on a detection result in the rotation angle detection step. A program used in a behavior detection method for detecting the behavior or posture of a moving body wearing itself,
A movement amount detection step for detecting a movement amount of the mounting position;
A rotation angle detection step for detecting a rotation angle around the center point of the action detection device based on the detection result in the movement amount detection step;
An acceleration measuring step for measuring acceleration data for the moving object;
A program for causing a computer to execute a correction step of correcting the measured acceleration data based on a detection result in the rotation angle detection step. A behavior detection system comprising a behavior detection device that detects the behavior or posture of a moving object wearing itself and a terminal device connected via a network,
The behavior detection device includes:
A movement amount detecting means for detecting a movement amount of the mounting position;
A rotation angle detection means for detecting a rotation angle around the center point of the action detection device based on a detection result in the movement amount detection means;
Acceleration measuring means for measuring acceleration data for the moving object;
Correction means for correcting the measured acceleration data based on the detection result in the rotation angle detection means;
Transmission means for transmitting the correction result in the correction means,
The terminal device
A behavior detection system comprising: a reception unit that receives a correction result transmitted from the transmission unit.

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