JP4579870B2 - Wake up sign detection device - Google Patents

Description

  The present invention relates to a rising sign detection device, and more particularly to a rising sign detection device that detects that a human body is getting up in a bed.

In the medical field, getting up in bed may be dangerous depending on the patient. Under such circumstances, various devices for detecting a sign that a patient gets up in bed have been developed.
As such a device, there is a sensor for measuring a distance at the upper part of the headboard of the bed, and when the predetermined distance is detected by this sensor, there is a rising sign detection device that detects a sign that the human body will rise (for example, (Refer nonpatent literature 1.).

  In addition, there is an example of sensing a human body on a bed (see, for example, Non-Patent Document 2 and Non-Patent Document 3), but these are targeted for sleep time apnea syndrome, which has been attracting attention in recent years. The subject is “the state of breathing”, and attention is not paid to detection of a wake-up sign.

"Idea for living withered technology", IT media news, search January 10, 2006 <http://www.itmedia.co.jp/news/articles/0510/25/news093.html>

“Development of a non-contact / unrestrained respiratory monitoring system”, Masato Nakajima, Faculty of Science and Technology, Keio University, January 10, 2006 search <http://www.njima.elec.keio.ac.jp/gazotoku2005/gazotoku- 2005-10.pdf>

“Non-restrained sensing technology and sleep evaluation technology”, Hidetaka Sakai et al., January 10, 2006 search <http://www.sanyo.co.jp/giho/no73/pdf/7312.pdf>

However, when a sensor that only detects a distance is used, a person and an object cannot be distinguished. For example, when turning over, there is a possibility that a sensor reacts to a futon and a false alarm is generated.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a rising sign detection device that can accurately and quickly detect a rising motion on a bed.

  According to the first aspect of the present invention, a plurality of sensor sets each including a temperature sensor that detects a temperature or a temperature change and a distance sensor that measures a distance, and a temperature sensor or a distance sensor included in the plurality of sensor sets. Means for selecting a sensor set that has detected a human body on a bed based on sensor data from: a position of the selected sensor set; and a distance measured by a distance sensor included in the selected sensor set; A state transition table for executing a clustering process to calculate the center of gravity coordinates of the head of the human body on the bed, a plurality of states including a state of rising, and a state transition condition in association with each other And the calculated center-of-gravity coordinates satisfy a state transition condition corresponding to the state immediately before the state of the rising sign, and the rising sign A rising sign detection device comprising: means for detecting a transition to a state; and means for notifying a rising sign of a human body when it is detected that the state has transitioned to the rising sign state. is there.

  According to a second aspect of the present invention, in the first aspect, the state transition condition defines a relationship between a plurality of regions defined in the coordinate system on the bed and the calculated barycentric coordinates. It is a rising sign detection device characterized by

  ADVANTAGE OF THE INVENTION According to this invention, the rising sign detection apparatus which can detect the rising operation on a bed correctly early can be provided.

Hereinafter, a rising sign detection device according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating an example of an environment in which a rising sign detection apparatus according to an embodiment of the present invention is used.
In the figure, a handrail 2 is attached to the side frame of the bed 1 as an auxiliary member used when the human body gets up. A headboard 3 is attached to the side surface of the head-side bed when the human body lies on the bed 1, and a footboard 4 is attached to the side surface of the foot-side bed 1.

A sensor set (not shown) having a distance sensor and a temperature sensor is attached to the headboard 3 and the surface 5 including the headboard. Based on the output from the sensor set, the embodiment of the present invention is applied. A rising sign detection process is performed.
The distance sensor is a sensor whose measurement range is a spot-type or near-spot-shaped area, and the temperature sensor is a sensor that measures the temperature change or temperature of an area that matches or is similar to the measurement area of the distance sensor. is there. The sensor set outputs a pair of the distance measurement result and the presence or absence of temperature change or the temperature measurement result.

Examples of sensors for measuring the distance include a photoelectric sensor and an ultrasonic distance sensor, a pyroelectric sensor as a sensor for detecting a temperature change, and a thermopile as a sensor for detecting a temperature.
FIG. 2 is a view for explaining the mounting direction of the sensor set. As shown in the figure, the sensor set 11 is attached so that its detection direction is parallel to the mat 6 of the bed 1.

3 to 11 are views for explaining the arrangement of the sensor set.
FIG. 3 is an example in which one sensor set 11 is provided in the center of the headboard 3. One or more sensor sets may be installed at an arbitrary position. FIG. 4 is a diagram showing a case where a plurality of sensor sets 11 are arranged in parallel along the upper side of the headboard 3, and FIG. 5 is a diagram showing a case where a plurality of sensor set rows of the headboard 3 are arranged in the horizontal direction. It is.

  FIG. 6 is a diagram showing a case where a plurality of sensor sets 11 are arranged on the headboard 3 in a square lattice pattern, and FIG. 7 is a diagram showing a case where a plurality of sensor sets 11 are arranged on the headboard in a hexagonal fine lattice pattern. FIG. 8 is a diagram showing a case where the sensor set 11 shown in FIGS. 3 and 4 is combined. Various arrangements of sensor sets can be considered. The sensor set 11 is attached so that the human body on the bed can be measured.

  Moreover, you may arrange | position combining a sensor set. FIG. 9 is a diagram for explaining the arrangement of the sensor group 15 when a plurality of sensor sets are combined. In the same figure, the sensor group 15 is arranged in the vicinity of the center of the headboard 3 in the horizontal direction, in the vicinity of the height of the head of the human body, and in the measurement range. FIG. 10 is a top view of the head board 3 to which the sensor group 15 shown in FIG. 9 is attached. FIG. 11 is a diagram showing a case where the sensor group 15 shown in FIGS. 9 and 10 is arranged in the vertical direction near the center in the horizontal direction of the headboard 3.

  As shown in FIGS. 9 to 11, when a sensor group 15 in which a plurality of sensor sets 11 are combined is used, the sensors can be concentrated at a specific location, so that wiring becomes easy and a wide area can be measured. . The sensor set 11 or the sensor group 15 may be embedded in the head board 3 or attached to the surface of the head board 3 using a jig.

Further, a rising sign determination device is provided that is electrically connected to the head board 3 or the sensor set 11 attached to the surface 5 including the head board 3 and detects the rising sign based on the sensor data of the sensor set 11. .
FIG. 12 is a diagram illustrating a configuration of the determination device 20.

As shown in the figure, the determination device 20 includes a sensor signal acquisition unit 21, a recording unit 22, a determination unit 23, and a process execution unit 24.
The sensor signal acquisition unit 21 acquires the temperature (or temperature change) detected by the temperature sensor included in each sensor set 11 and the distance detected by the distance sensor, and stores them in the recording unit 22.

As shown in FIG. 13, the recording unit 22 includes sensor ID, sensor data (temperature (or temperature change), distance) from the sensor set acquired by the sensor signal acquisition unit 21, and determination data (region information, state transition). Table).
The sensor ID is identification information for specifying the sensor, and is acquired together with sensor data from the sensor.

The determination data stores information used when performing the rising sign detection process according to the embodiment of the present invention, and stores information necessary for determination in each embodiment. .
For example, in the case of a method of detecting a rising sign by the transition of the barycentric coordinates of the area that can be regarded as the head, information for specifying the installation coordinates of each sensor set 11 (the origin of the three-dimensional coordinates and the axis direction are arbitrarily determined. For example, see FIG. 1), information indicating the range of each region, a state transition table that defines a transition order at the time of a rising sign, and the like are recorded. In addition, when the shortest stay time and the longest stay time required for each transition are defined, these values are also recorded.

  Note that the method for recording the determination data in the recording unit 22 may be set manually or automatically. As an example of a method of setting manually, area information, a state transition table indicating an area transition order at the time of a rising sign, a minimum stay time required for a transition, a longest stay time, and the like are prepared in advance. To enter.

  As an example of the automatic setting, the user gets up and performs the operation, and the sensor data of the sensor set at that time is used. For example, in order to automatically divide the region, the center of gravity coordinates of the region considered to be the head and the moving speed thereof are calculated, and the middle point of the fast section is set as the boundary point of the region (two-dimensional region division is performed. When implementing, the vertical bisector of the trajectory of the center of gravity coordinates at the midpoint is used as the boundary line of the region, and when the region is divided in three dimensions, the plane having the trajectory of the center of gravity coordinates at the midpoint as a perpendicular line Is the boundary of the region.)

  Also, the response time of the sensor set is measured, with a margin of about several seconds before and after, and recorded as the sensor response shortest time and the longest time, respectively. Sensor data may be recorded in association with time, and sensor data recorded in association with this time is recorded only for a certain number or a certain length of time, but previously recorded sensor data is a new sensor. It is assumed that data will be deleted as it is acquired and time passes.

  The determination unit 23 performs a rising warning determination process using the sensor data acquired by the sensor signal acquisition unit 21 and the data stored in the recording unit 22, and outputs the determination result to the process execution unit 24. When the determination unit 23 detects the rising sign, the process execution unit 24 notifies the external device 31 that the rising sign has been detected.

The determination device 20 may be realized using a logic circuit, or may be realized as a computer that includes a circuit that receives a signal from a sensor and is equipped with a program for performing determination processing.
<Pre-processing for rising sign detection processing>
As a pre-process for the rising sign detection process, a sensor selection process is performed in order to use only the output value of the sensor set measuring the human body for the rising sign detection process. When using a sensor indicating a temperature change, the value of the distance sensor of the sensor set to which the sensor indicating the temperature change is responding is used.

  When using a sensor for detecting temperature, the value of a distance sensor of a temperature sensor set indicating a value within a predetermined temperature range is used. However, the “range close to the human body temperature” is designated in advance. In addition, only the sensor data of the sensor set that meets the conditions may be recorded in the recording unit 22 in advance, or the data of all the sensor sets may be recorded in the recording unit 22 and used as pre-processing when determining the rising sign. Information to be selected may be selected.

  FIG. 14 is a flowchart for explaining a pre-process for selecting sensor data to be used in the determination of a rising sign when a temperature sensor that detects a temperature change is used. In the figure, sensor data of all sensor sets are read (S1), and a determination is made as to whether or not a temperature sensor indicating a temperature change is responding to the sensor data of all sensor sets (S2). If it is determined in S2 that there is no reaction, the sensor data is deleted (S3), and if it is reacting, the deletion is not performed. In this way, sensor data used in the rising sign detection process is selected.

  FIG. 15 is a flowchart for explaining a pre-process for selecting sensor data to be used when determining a wake-up sign when a temperature sensor that detects temperature is used. In the figure, sensor data of all sensor sets are read (S11), and it is determined whether or not the temperature indicated by the read sensor data is within a predetermined range for the sensor data of all sensor sets (S11). S12). If it is determined in S12 that it is out of the range, the sensor data is deleted (S13), and if it is within the range, the deletion is not performed. In this way, sensor data used in the rising sign detection process is selected.

In addition, in order to reduce the amount of calculation and the probability of false alarms, a range through which a human body (especially the head) passes when detecting a rising symptom is defined in advance, and only a distance sensor that indicates a value within this range is used for detecting the rising symptom. Pre-processing may be added.
FIG. 16 is a flowchart for explaining preprocessing when only the value of a predetermined distance sensor is raised and used for the predictive sign detection processing. In the figure, the sensor data of all the sensor sets are read (S21), and it is determined whether or not the value measured by the distances of the distance sensors included in the sensor set is within a predetermined range (S22). If it is determined that it is out of the range, the sensor data is deleted (S23), and if it is within the range, the deletion is not performed. In this way, sensor data used in the rising sign detection process is selected.
<Detection of rising signs using transition of barycentric coordinates>
FIG. 17 is a flowchart for explaining the rising sign detection process using the transition of the barycentric coordinates performed on the sensor data using the preprocessing.

  Here, as a premise, it is assumed that the sensor set 11 is arranged with a planar spread on the headboard 3 and its extended surface, such as a square lattice shape or a hexagonal fine lattice shape. Further, the installation coordinates of the temperature sensor and the distance sensor included in each sensor set are known and are recorded in the recording unit 22 in advance.

  First, after the area information to which the barycentric coordinates belong is initialized (S31), sensor data measuring the human body is read (S32). Thereafter, clustering is performed based on the distance measured by the distance sensor of the sensor set that measures the human body and the installation coordinates of the distance sensor (S33).

  Next, as a result of the clustering process, the cluster closest to the headboard 3 is selected as “head” (S34), and the three-dimensional barycentric coordinates of the selected cluster are calculated (S35). Thereafter, the area to which the calculated three-dimensional barycentric coordinates belong is determined (S36).

  In this area, the area that passes when the head rises through the space above the bed is divided into a plurality of areas by trial, and information indicating the coordinates of the divided areas is recorded in the recording unit 22. . Further, in the rising warning operation, a state transition table indicating in what order the head passes through the divided areas is recorded in the recording unit 22 in advance.

After the area is determined in S36, it is determined whether or not the area to which the barycentric coordinates belong has changed (S37). If it is determined in S37 that the barycentric coordinates have not changed, the process returns to S32.
On the other hand, if it is determined in S37 that the center-of-gravity coordinates have changed, a determination is made as to whether or not the region transition during the rising motion of the human body is being followed (S38). In S38, when it is determined that the region does not follow the region transition, the process returns to S31. The determination as to whether or not the region transition is performed is made based on the state transition condition defined by the state transition table. The state transition condition is defined by the relationship between a plurality of areas defined in the coordinate system on the bed and the calculated barycentric coordinates.

  FIG. 19 is a diagram showing a state transition table, and FIG. 20 is a state transition diagram defined by the state transition table shown in FIG. In the figure, when the barycentric coordinates belong to the region A in the state J1 that is not a rising sign, the state transitions to the state J2 in the rising sign (initial stage). When the center of gravity coordinates belong to the region B in the state J2 in the rising warning (initial) state, the state transitions to the state J3 in the rising warning (middle period). When the center of gravity coordinates belong to the region C in the state J3 during the rising sign (middle period), the state transitions to the state J4 during the rising sign (late stage). If the barycentric coordinates belong to the region D in the state J4 during the rising sign (late stage), the state transits to the rising sign state J5. In S38, with reference to the state transition table shown in FIG. 19, it is determined whether or not the region transition at the time of the rising warning operation is being followed.

  If it is determined in S38 that the region is along the region transition, the region information to which the barycentric coordinates belong is updated (S39), and it is determined whether or not it is a rising sign state (S40). That is, the region to which the barycentric coordinates belong is determined, and when the region transitions in accordance with the state transition condition determined in advance by the state transition table and reaches a state where it has risen, a rising sign is detected.

  If it is determined in S40 that the state is not a rising sign state, the process returns to S32. If it is determined that the state is a rising sign state, the determination unit 23 informs the process execution unit 24 that the rising sign has been detected. Notice. When the processing execution unit 24 is notified by the determination unit 23 that the rising sign has been detected, the processing execution unit 24 notifies the external device 31 that the rising sign has been detected.

  In addition to using the three-dimensional barycentric coordinates as they are, the three-dimensional coordinates may be projected onto, for example, the headboard surface to obtain two-dimensional coordinates, and transitions of the barycentric coordinates in the two-dimensional plane may be used. In this case, when the result of area division in 3D space is projected to 2D space, the 2D space area belonging to multiple areas is regarded as a new area, and when it is predicted to rise up including this new area Describes the transition of the barycentric coordinates.

  The center of gravity coordinates should stay in each state to reduce false detections due to slight movements of the center of gravity coordinates and movements other than signs of rising, such as quick hand movements when reaching the bedside table. When the shortest stay time is set and the barycentric coordinates transition to the next state within a time shorter than the shortest stay time, this transition may be deleted.

If the barycentric coordinates have stayed in a specific state for a long time, for example, if the barycentric coordinates appear for a long time in the state of an unstable system in the middle of the rising sign, even if it is determined that the action is other than the rising sign Good.
FIG. 18 is a flowchart for explaining the rising sign detection process using the transition of the barycentric coordinates with a limited state stay time.

  First, the area information to which the barycentric coordinates belong is initialized (S51), the timer is reset (S52), and the sensor data measuring the human body is read (S53). Thereafter, clustering is performed based on the distance measured by the distance sensor of the sensor set measuring the human body and the installation coordinates of the distance sensor (S54).

  Next, as a result of the clustering process, the cluster closest to the headboard 3 is selected as the “head” (S55), and the three-dimensional barycentric coordinates of the selected cluster are calculated (S56). Thereafter, the area to which the calculated three-dimensional barycentric coordinates belong is determined (S57).

  This area is divided in advance into a plurality of areas that pass through the space above the bed when the head is raised, and area information indicating the coordinates of the divided areas is recorded in the recording unit 22. deep. Further, in the rising warning operation, a state transition table indicating in what order the head passes through the divided areas is recorded in the recording unit 22 in advance.

After the area is determined in S57, it is determined whether or not the area to which the barycentric coordinates belong has changed (S58). If it is determined in S58 that the barycentric coordinates have not changed, the process returns to S53.
On the other hand, if it is determined in S58 that the barycentric coordinates have changed, it is determined whether or not the conditions for the shortest and longest stay time are satisfied (S59). If it is determined in S59 that the condition is not satisfied, the process returns to S51.

  If it is determined that the conditions of the shortest and longest stay time in S59 are satisfied, it is determined whether or not the region transition during the rising motion of the human body is being followed (S60). In S60, when it is determined that the region does not follow the region transition, the process returns to S51. The determination as to whether or not the region transition is performed is made based on the state transition condition defined by the state transition table.

  If it is determined in S60 that the region is in line with the region transition, the region information to which the barycentric coordinates belong is updated (S61), and it is determined whether or not it is a rising sign state (S62). That is, the region to which the barycentric coordinates belong is determined, and when the region transitions in accordance with the state transition condition determined in advance by the state transition table and reaches a state where it has risen, a rising sign is detected.

  If it is determined in S62 that the state is not a rising sign state, the process returns to S52. If it is determined that the state is a rising sign state, the determination unit 23 informs the process execution unit 24 that the rising sign has been detected. Notice. When the processing execution unit 24 is notified by the determination unit 23 that the rising sign has been detected, the processing execution unit 24 notifies the external device 31 that the rising sign has been detected.

  Note that the region determination may be performed using an average value or an intermediate value of the past M centroid coordinate values instead of the centroid coordinate value calculated from the sampling data at a certain time. When calculating the barycentric coordinate value, weighting may be performed in which a large weight is given to sensor data close to the headboard.

Furthermore, instead of the center of gravity of the cluster, an intermediate value or average value of the cluster may be used. If the size of the cluster is equal to or smaller than a predetermined value, there is a high possibility that an object other than the head has been detected. Therefore, preprocessing for discarding the cluster may be added. If the size of the cluster is greater than or equal to a predetermined position, it is highly likely that an object other than the head has been detected or that the head, futon, and shoulders are clustered together. May be added.
<Wake-up sign detection process with improved sensor set installation coordinates>
In the present embodiment, the installation coordinates of the sensor set are devised. When the human body is lying on the bed with a futon on top, the height of the part where the futon is highest from the mat surface is measured. As a means for measuring, a measure may be used, or a lens finder may be used. In this case, one measurement result may be used. However, if you want to reduce the oversight error by measuring multiple times, it will be the lowest value, if you want to reduce the false reaction, it will depend on the change in the measurement result for each measurement. If it is desired to reduce the variation of the tuning level, an average value or an intermediate value may be used.

  Let H (F) be the height of the futon obtained by height measurement. A plurality of rows of sensor sets in a direction perpendicular to the mat surface are arranged on the headboard and its extended surface in a direction parallel to the surface of the mat, at a height of H (F) or more from the mat. When it is desired to detect the rising sign at the earliest timing, it is determined that one or more of the sensor sets arranged in a line has reacted, and the rising sign is detected.

FIG. 21 is a flowchart for explaining the rising warning detection process when the sensor sensor set reacts for a certain time or more when the sensor set row is arranged in this way.
Timers for all sensor sets are initialized (S71), and the processes of S72 to S76 are repeated. That is, the sensor data of the sensor set is read (S72), and it is determined whether or not the timer of this sensor set is in operation (S73).

  In S73, if it is determined that the timer is not operating, it is determined whether or not the sensor set is responding (S74). If it is determined that the timer is not responding, The process proceeds to S72 for the sensor set. On the other hand, if it is determined in S74 that the sensor set is responding, a timer for the sensor set is started (S75), and the process proceeds to S72 for the next sensor set.

  In S73, if it is determined that the timer is operating, it is determined whether or not the sensor set is responding (S76). The process proceeds to S72 for the sensor set. On the other hand, if it is determined in S76 that the sensor set is not responding, the timer for the sensor set is stopped (S77) and the reaction duration is within a specified range (for example, is the minimum reaction time or longer)? A determination of whether or not is made (S78).

  In S78, when it is determined that it is not within the specified range, the process proceeds to S72 for the next sensor set. On the other hand, if it is determined that it is within the prescribed range, a rising sign is detected. The determination unit 23 notifies the processing execution unit 24 that a warning sign has been detected. When the processing execution unit 24 is notified by the determination unit 23 that the rising sign has been detected, the processing execution unit 24 notifies the external device 31 that the rising sign has been detected. A sensor set that is arranged in a row by pre-determining “how far the head passes through the headboard when it is a sign of rising” (range of values indicated by the distance sensor measurement results). When one or more of the distance measurement result values become a value within a predetermined range, it may be detected as a wake-up sign.

FIG. 22 is a flowchart for explaining a rising sign detection process performed based on the distances of the distance sensors included in the sensor set.
Timers for all sensor sets are initialized (S81), and the processes of S82 to S88 are repeated. That is, the sensor data of the sensor set is read (S82), and it is determined whether or not the timer of this sensor set is in operation (S83).

  In S83, if it is determined that the timer is not in operation, it is determined whether or not the sensor set is responding (S84). The process proceeds to S82 for the sensor set. On the other hand, if it is determined in S84 that the sensor set is reacting, it is determined whether or not the measurement value of the sensor set of the sensor set is within a specified range (S85). If it is determined that the value is, the timer for the sensor set is started (S86), and the process proceeds to S82 for the next sensor set. If it is determined in S85 that the measurement value of the sensor set by the distance sensor is not within the specified range, the process proceeds to S82 for the next sensor set.

  If it is determined in S83 that the timer is operating, it is determined whether or not the sensor set is responding (S87). If it is determined that the sensor is responding, the sensor is detected. It is determined whether or not the measured value of the set is within the specified range. If it is determined that the measured value is within the specified range, the process proceeds to S82 for the next sensor set.

  On the other hand, if it is determined in S87 that the sensor set is not responding or if it is determined in S88 that the measured value is not within the specified range, the timer for the sensor set is stopped (S89). Then, a determination is made as to whether or not the reaction duration is within a specified range (for example, is the minimum reaction time or longer) (S90).

In S90, when it is determined that it is not within the specified range, the process proceeds to S82 for the next sensor set. On the other hand, if it is determined that it is within the prescribed range, a rising sign is detected. The determination unit 23 notifies the processing execution unit 24 that a warning sign has been detected. When the processing execution unit 24 is notified by the determination unit 23 that the rising sign has been detected, the processing execution unit 24 notifies the external device 31 that the rising sign has been detected.
Therefore, according to the embodiment of the present invention, the sensor set is attached to a predetermined height, and the sensor data from the sensor set is preprocessed and then the rising sign detection process is performed. It is possible to accurately detect the rising signs of human body.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

  In addition, the method described in the embodiment is, for example, a magnetic disk (floppy (registered trademark) disk, hard disk, etc.), optical disk (CD-ROM, DVD) as programs (software means) that can be executed by a computer (computer). , MO, etc.), a semiconductor memory (ROM, RAM, flash memory, etc.) or the like, or can be transmitted and distributed via a communication medium. The program stored on the medium side includes a setting program that configures software means (including not only the execution program but also a table and data structure) in the computer. A computer that implements this apparatus reads a program recorded on a recording medium, constructs software means by a setting program as the case may be, and executes the above-described processing by controlling the operation by this software means. The recording medium referred to in this specification is not limited to distribution, but includes a storage medium such as a magnetic disk or a semiconductor memory provided in a computer or a device connected via a network.

It is a figure which shows an example of the environment where the rising sign detection apparatus which concerns on embodiment of this invention is used. It is a figure for demonstrating the attachment direction of a sensor set. This is an example in which one sensor set is provided in the center of the headboard. It is a figure which shows the case where a some sensor set is arrange | positioned in parallel along the upper side of a headboard. It is a figure which shows the case where the row | line | column of several sensor sets is arrange | positioned in parallel along the upper side of a headboard. It is a figure which shows the case where the several sensor set is arrange | positioned on the headboard in the shape of a square lattice. It is a figure which shows the case where the several sensor set is arrange | positioned on the headboard in the shape of a hexagonal fine lattice. It is a figure which shows the case where the sensor set shown in FIG.3 and FIG.4 is combined. It is a figure for demonstrating arrangement | positioning of the sensor group at the time of combining several sensor sets. FIG. 10 is a top view of a head board to which the sensor group shown in FIG. 9 is attached. It is a figure which shows the case where the sensor group shown in FIG.9 and FIG.10 is arrange | positioned at the vertical direction vicinity of the center of the horizontal direction of a headboard. It is a figure which shows the structure of a determination apparatus. It is a figure which shows a recording part. It is a flowchart for demonstrating the pre-processing which selects the sensor data utilized in the case of a rising prediction determination, when using the temperature sensor which detects a temperature change. It is a flowchart for demonstrating the pre-processing which selects the sensor data utilized in the case of using a temperature sensor which detects temperature, and at the time of rising prediction determination. It is a flowchart for demonstrating the pre-process in the case of using only the value of a predetermined | prescribed distance sensor for a rising sign detection process. It is a flowchart for demonstrating a rising sign detection process using the transition of the gravity center coordinate performed with respect to the sensor data using a pre-process. It is a flowchart for explaining a rising sign detection process using a transition of barycentric coordinates with a limited state stay time. It is a figure which shows a state transition table. FIG. 20 is a state transition diagram defined by the state transition table shown in FIG. 19. It is a flowchart for demonstrating a rising warning detection process when the temperature sensor of a sensor set reacts more than fixed time. It is a flowchart for demonstrating the rising warning detection process performed based on the distance of the distance sensor contained in a sensor set.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Bed, 2 ... Handrail, 3 ... Head board, 4 ... Hood board, 5 ... Surface including a head board, 6 ... Matt, 11 ... Sensor set, 15 ... Sensor set, 21 ... Sensor signal acquisition part, 22 ... Recording , 23 ... determination unit, 24 ... process execution unit, 31 ... external device.

Claims (4)

A plurality of sensor sets having a temperature sensor for detecting temperature or temperature change and a distance sensor for measuring distance;
Means for selecting a sensor set that detects a human body on a bed based on sensor data from temperature sensors or distance sensors included in the plurality of sensor sets;
Based on the position of the selected sensor set and the distance measured by the distance sensor included in the selected sensor set, a clustering process is performed to calculate the center-of-gravity coordinates of the head of the human body on the bed Means,
A state transition table for storing a plurality of states including a state of a rising sign and a state transition condition in association with each other;
Means for detecting that the calculated center-of-gravity coordinates satisfy a state transition condition corresponding to a state immediately before the state of rising sign and transitioned to the state of rising sign;
A rising sign detection device, comprising: means for notifying a rising sign of a human body when it is detected that the state has transitioned to the rising sign state.   2. The rising sign detection device according to claim 1, wherein the state transition condition defines a relationship between a plurality of regions defined in a coordinate system on the bed and the calculated barycentric coordinates. A sensor set for detecting a human body on a bed based on sensor data from temperature sensors or distance sensors included in a plurality of sensor sets having a temperature sensor for detecting temperature or temperature change and a distance sensor for measuring distance. Selected,
Based on the position of the selected sensor set and the distance measured by the distance sensor included in the selected sensor set, a clustering process is performed to calculate the barycentric coordinates of the head of the human body on the bed. ,
A state transition in which the calculated barycentric coordinates correspond to the state immediately before the state of the rising sign with reference to a state transition table that stores a plurality of states including the state of the rising sign and the state transition condition in association with each other Detects that the condition has been met and has transitioned to a wake-up state,
A rising sign detection method in a rising sign detection device, wherein a rising sign of a human body is notified when it is detected that the state has transitioned to the rising sign state. 4. The rising sign detection method according to claim 3 , wherein the state transition condition defines a relationship between a plurality of areas defined in a coordinate system on the bed and the calculated barycentric coordinates.

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