JP5648840B2 - On-bed and indoor watch system - Google Patents

Description

  The present invention relates to a monitoring system on a bed and in a room, and in particular, can monitor various situations of a person resting on the bed, and the person falls from the bed or falls indoors after getting out of the bed. The present invention relates to an on-bed and indoor watch system that can immediately recognize such a critical situation and promptly notify a nurse or family member.

  There are accidents that elderly people and sick people fall from the bed and get injured, and nurses, helpers and families are late to notice while falling down on the bedside floor or in the room where the bed is placed It occurs frequently in medical / welfare facilities and residences for elderly people living alone. In order to prevent these accidents in advance, sensors that detect getting up in the bed and sensors that detect moving from the bed to the floor have been developed, and a mechanism has been proposed for notifying related personnel such as nurses as alarm information. (Patent Documents 1 and 2).

  Patent Document 1 discloses a fall prevention bed equipped with an infrared sensor. In this fall prevention bed, an infrared light emitting part and a light receiving part are provided at a predetermined height at the left and right ends of the head side of the bed and a predetermined height at the right and left ends of the foot side, and a plurality of pieces passing between the light emitting part and the light receiving part are provided. Infrared rays are arranged in a W shape, which is used as a detection line. The person on the bed can recognize the pattern that the detection line blocks and can remotely grasp the movement of the person on the bed.

  In Patent Document 2, in a place where privacy protection of a room occupant is required such as a toilet, bathroom, bedroom, etc., an elderly person or the like can be obtained by determining the attitude of the room occupant without infringing on privacy. An indoor monitoring system has been disclosed that can quickly detect a critical state in which a person becomes unconscious while falling. In Patent Document 2, for example, a bright spot image acquired every predetermined time by an FG visual sensor installed on a ceiling surface of a private toilet is compared with a preliminarily stored reference plane bright spot image. Extract the moved area. Then, the feature amount of the moving bright spot region is calculated, and it is determined whether the posture of the person in the private room toilet is “standing”, “sitting”, or “falling”. If the posture of “sitting” or “falling” continues for more than a predetermined time, the person is notified of the person in a critical state by a message or voice to the family's mobile phone, and the critical state is quickly reached Can be understood and dealt with.

JP 2007-289251 A JP 2001-28086 A

  In the invention of Patent Document 1, it is possible to grasp the state where a person on the bed gets up (sits down) or leaves (leaves from the bed), but for example, the person falls from the bed and falls into the bedside. I can't figure out that there is.

  In the invention of Patent Document 2, since the monitoring space is regarded as a bright spot image that moves a three-dimensional shape of a person in a space such as a toilet, it is necessary to prepare a reference plane bright spot image in advance in the target space. In addition, enormous calculation processing is required for collation with the moving region of the moving bright spot.

  In addition, there is a system in which a mat sensor that detects a fall is installed on the bedside floor to notify a person such as a nurse that there is a person on the floor. With this type of mat sensor, it is impossible to identify whether a person on the bed has responded to a situation where the person descended from the bed or a person who has visited from the outside has reacted to a situation where the person has stood on the spot. In the latter case, a false alarm will be reported. Further, it is not possible to determine that the floor has fallen on the floor only with the mat sensor. For this reason, a plurality of sensors are installed around the bed to detect falls and falls, and the installation work is complicated and wiring is complicated. If the sensor reacts even when the nurse stands at the bedside, it may interfere with nursing work. In addition, even if various sensors are combined, it is currently impossible to specifically determine that a person is falling on the floor.

  By the way, the various types of watching around the bed described above may cause behaviors that cannot be predicted by the sensor when the care recipient or dementia is targeted. For this reason, it is preferable to grasp the physical characteristics and behavioral characteristics of each individual subject and to determine and estimate the behavior and situation of the target person in consideration of such information. Therefore, the object of the present invention is to solve the above-mentioned problems of the prior art, and observe the various situations by taking into account the behavior of the person resting on the bed in consideration of the information according to the characteristics of each individual. It is possible to immediately recognize a critical situation where each person (general watching target person, specific watching target person) falls from the bed or falls indoors after getting out of bed. To provide a more reliable on-bed and indoor watching system based on the physical information or behavioral information of the target person in addition to the conventional judgment criteria that can promptly notify family members, etc. .

In order to achieve the above object, the on-bed and indoor watch system of the present invention includes a three-dimensional distance detection means capable of detecting the state of a subject to be watched in the room as information on a plane position and a height direction, The height direction information obtained by the three-dimensional distance detection means divides the room into a bed area, a bedside area, and a floor area, and a comparative reference height set corresponding to each area. Data processing means for comparing and determining the status of the target person in each region, and a determination result output means for reporting the status of the target person to the outside by the data processing means according to the status of the target person After confirming that the subject is present in the bed area, the comparison reference height set in the floor area around the bedside area is compared with the height direction information of the subject. And that From frequency ratio, it determines that the other subjects in addition to the subject is occupancy, characterized in that to perform the situation report if necessary.

In the determination of the comparison reference height and the situation, it is preferable to perform determination using a value adjusted based on the physical information of the subject.

It is preferable to arrange a human sensor to detect that the subject is in the room.

Another on-bed and indoor watching system as another invention is a three-dimensional distance detecting means capable of detecting a state of a subject to be watched in the room as information on a plane position and a height direction, and the three-dimensional distance detecting means. The height direction information obtained in (1) is divided into a bed area, a bedside area, and a floor area, and the room is compared with a comparison reference height set corresponding to each area. Data processing means for determining the status of the target person within, and a judgment result output means for reporting the status of the target person externally according to the status of the target person by the data processing means, In the discrimination determination of the person's situation, a comparison judgment with a threshold value set according to the target person's action required time information is added.

In this system, the comparison reference height set in the bed area is compared with the height direction information of the subject, and it is determined from the area ratio that the subject is getting up on the bed. Depending on the situation, it is possible to report the situation.

Further, the comparison reference height set in the bedside area is compared with the height direction information of the target person, and the target person has left the bed or falls from the bed based on the area ratio, and the bedside It is possible to distinguish and judge whether the person has fallen, and to report the situation as necessary.

Furthermore, the comparison reference height set in the floor area around the bedside area is compared with the height direction information of the target person, and whether the target person is present in the floor from the area ratio It is possible to distinguish and judge whether or not the floor has fallen, and to report the situation as necessary.

In addition, after it is confirmed that the subject is in the bed area, the comparison reference height set in the floor area around the bedside area is compared with the height direction information of the subject. From the area ratio, it can be determined that another target person is in the room, and the situation can be reported as necessary.

In the determination of the comparison reference height and the situation, it is preferable to perform determination using a value adjusted based on the physical information of the subject. In addition, it is preferable to detect that the subject is in the room by arranging a human sensor. Furthermore, it is preferable to use a detection camera provided on the ceiling surface capable of focusing on multiple points as the three-dimensional distance detection means.

  In these cases, it is preferable that detection of the height direction information of the subject by the three-dimensional distance detection means is performed after the human sensor detects that the subject is in the room.

  According to the present invention, a single three-dimensional distance detection means operates to wake up the person being watched on the bed, move to the bedside, fall to the floor, stay in the room, visitor information from the outside, etc. There is an effect that the situation can be recognized. Thereby, installation of sensors and wiring work are easy, and there exists an effect that reliable watching information can be acquired.

The schematic explanatory drawing which showed the state of the room to which the on-bed and indoor monitoring system of this invention was applied. The plane layout figure which showed the example of bed arrangement | positioning in the room | chamber interior shown in FIG. FIG. 3 is a partition diagram of the indoor sensing area shown in FIG. 2. 1 is a schematic system configuration diagram in one embodiment of the present invention. The flowchart (overall) of the condition judgment of the subject on the bed to the floor. A flow chart (individual situation judgment) of the situation judgment of the subject on the bed to the floor. Explanatory drawing which showed the example of a subject's condition typically (at bedtime: initial state). Explanatory drawing which showed the example of a subject's condition typically (situation in a bed area). Explanatory drawing which showed the example of a subject's condition typically (situation in a bedside area). Explanatory drawing which showed the example of a subject's situation typically (situation in a floor). 7 is a flowchart using another situation determination method for the embodiment of FIG. The schematic flowchart in the case of adding a person's physical information and action information and performing a situation determination. The change figure of the illumination light control rate which showed the example which utilized the subject's condition information for the illumination control corresponding to the action at the time of a subject's sleeping.

  Hereinafter, the following examples will be described with reference to the accompanying drawings as modes for implementing the on-bed and indoor watching system of the present invention.

  FIG. 1 is a schematic explanatory view showing the state of the room 1 to which the on-bed and indoor watching system of the present invention is applied. In the figure, for the sake of explanation, the situation on the bed 2, the situation on the bedside, and the situation on the floor 4 are shown at the same time. For example, the bed 2 shows a state in which the watching target person P1 is sleeping. In addition, a state in which the watching target person P2 falls to the floor of the bedside 3 and cannot get up is shown. Furthermore, a state in which a watching target person (or a visitor) P3 stands on the floor 4 is shown.

  Further, in the figure, the human sensor 11 and the three-dimensional distance detection means 12 (FIG. 2 (d)) as the subject situation detection means 10 provided in the room 1 are substantially at the center of the ceiling surface 5. The installed state is shown. The detection operation range (sensing region) of these devices is schematically illustrated as a substantially conical image.

  FIGS. 2A and 2B are plan layout views showing an example of the arrangement of the beds 2 in the room 1 shown in FIG. FIG. 2C is a front view schematically showing a detection operation range (sensing region) of the detection means 10 for the subject situation installed on the ceiling surface 5 in the room 1. As shown in FIGS. 2 (a) and 2 (b), the bed 2 is arranged at the center or corner of the room 1 and the head side is arranged near the wall.

  3 is a conceptual diagram illustrating an example of setting a sensing area in the arrangement example of the bed 2 in FIG. 2A described above. For example, when a bed is arranged as shown in FIG. 2A, an area corresponding to the plane area of the bed is set as a bed area 2A. Further, a U-shaped sensing area having a width of about 1 m, recognized as the bedside area 3A, is set around the bed area 2A. The entire other room is set as the floor area 4A, and the height direction data h of the subject person is calculated and the situation is determined by the three-dimensional distance detection means described later in each sensing area.

  As described above, the interior 1 of the bed 2 has the bed 2 having a plane dimension (for example, width 0.9 m × length 2.2 m), the bedside region 3A so as to surround the periphery thereof, and the entire floor 4 outside thereof. The floor area 4A is divided into three sensing areas. Then, in each sensing area, as will be described later, the position (height) data of the target obtained by the three-dimensional distance detection means as the target situation detection means is compared with the reference height in the area, Based on the results, the situation of the target person (for example, taking into account the possibility of getting up, falling / falling, or the presence of a visitor in the room 1) is determined. It is possible to make a notification according to the situation of the other (registered) necessary person by an appropriate reporting means.

[Detection method of target person status]
As shown in FIGS. 2 (c) and 2 (d), a dome-shaped case 13 is attached to a substantially central position of the ceiling surface 5 of the room 1, and the inside of the dome-shaped case 13 serves as a detection means 10 for the subject's situation. The human sensor 11 and the three-dimensional distance detection means 12 are accommodated. As the human sensor 11, an infrared sensor capable of recognizing an operating object in the watching area in the room 1 is used. Since the infrared sensor detects and reacts to the movement of a person, if the person (subject) is sleeping on the bed 2 and there is no movement at all, the target person cannot be detected. It can function as a trigger for detecting the movement and operating the three-dimensional distance detection means 12. As the three-dimensional distance detecting means 12, a CCD camera having a multi-focus function capable of multi-point focusing in an imaging region is used.

  Regarding the three-dimensional distance detection means, its detection operation, and analysis technique, its configuration example, operation, and detection result calculation procedure will be briefly described. In this embodiment, a single multi-focus CCD camera (hereinafter referred to as a detection camera 12) is accommodated in the dome-shaped case 13 on the ceiling as the three-dimensional distance detection means 12 (FIG. 2 (d)). . The detection camera 12 is installed with its lens facing down, and its imaging range (sensing area) is appropriately set by a lens group capable of photographing the entire interior of the room 1 and the pixel surface of the optical sensor in the camera 12. . Then, in the data processing stage in the data processing means 20 (FIG. 4) described later, as shown in FIG. 3, the bed 2 area 2A, the bedside area 3A, and the surrounding masking process are performed. The focus area of each target area is subdivided in the vertical and horizontal directions, and a focus module is provided corresponding to each focus area so that in-focus data can be obtained in all focus areas. At this time, in each focus area, for example, in the bed area 2A, an initial value is set as a reference height plane, which is a plane that eliminates distortion due to the difference in distance between each point between the position just below the detection camera 12 and the four corners of the bed Is done. Similarly, in the bedside region 3A, a plane in which distortion due to a difference in distance at each point surrounded by the four corners of the bed and the four corners of the bedside 3 range is eliminated is a reference height plane. Also in the floor area 4A, a reference height plane is set in which distortion due to a difference in distance at each point when an image of a range between the four corners of the floor and a position directly below the camera is corrected.

  If the detection camera 12 is an apparatus capable of detecting a distance with an accuracy error of about several centimeters, various three-dimensional types of passive measurement methods such as the above-described multi-point focusing CCD camera and a stereo camera can be used. A distance sensor can be used. In addition, as an active measurement method, a horizontal beam for detection (ultrasonic waves, infrared rays, etc.) is emitted from the wall surface toward the bed and the floor, and the presence and position (height) of the subject P that blocks the beam are detected. It is also possible to compare the detected height with the reference height for comparison and determine the situation of the subject P.

  Next, a schematic configuration of the present system will be described with reference to FIG. As described above, the behavior and action of the subject person are grasped by the subject situation detection means. Among these, in the detection camera 12 which is a three-dimensional distance detection imaging means, focusing is performed at each target point in the divided area and the distance is obtained. The distance data obtained at each pixel is the data processing means. In the height direction data h calculation unit of 20 distance data, the vertical height is converted, and the height direction data h of the subject in each of the bed area 2A, the bedside area 3A, and the floor area 4A is the planar shape of each area. Are collected as two-dimensional data corresponding to Next, in the area height ratio calculation unit, the height (focusing position) obtained by imaging the subject in each area is compared with the comparison reference height set for situation determination, The ratio calculation of the area (number of vertical and horizontal pixels) based on the comparison result is performed. Based on the result, the subject situation recognition unit can instantly recognize whether the subject is getting up (sitting) on the bed 2, getting out of bed, or being in a critical state of falling. The result is reported to the nurse, helper or family by the result output means 30. As the means, communication with open sound equipment such as a speaker by an audio transmission unit, notification by an image device to a remote monitor by a screen display unit, in-facility PHS by a terminal communication unit, communication equipment such as an external mobile phone It is possible to make notifications according to the situation, such as reporting to.

Hereinafter, regarding the situation recognition method of the person on the bed to the floor by the watching system on the bed and in the room 1, refer to the flowcharts of FIGS. 5 and 6 and the examples of the situation of the person to be watched in FIGS. To explain.
(Initial setting)
In each watching area (bed area 2A, bedside area 3A, floor area 4A), the three-dimensional distance detecting means 12 measures three-dimensional distance data in a state where there is no watching target person in the target area. Is registered as an initial value (step 100, hereinafter referred to as S100).
(System startup)
The motion sensor 11 constantly observes the movement of the subject P in the room 1. As the activation of the system, a person who needs assistance and care as the subject person P lies on the bed with the help of a nurse, caregiver, accompanying family member (hereinafter referred to as a caregiver), When the caregiver leaves the bed, the system is turned on manually, or when the human sensor 11 confirms that the subject P is lying on the bed, the system is set to automatically start. You can also. In that case, the watching mode can be started from the point in time when the human sensor 11 first detects a movement that triggers the subject who has left the bed after the caregiver or the like has slept on the bed (S110, S120).

In this embodiment, as a preliminary state until the watch mode is automatically activated, H ₀ is set as shown in FIG. 7 as an initial height value for starting the watch mode, and the subject P1 The state of sleeping on the bed 2 can be confirmed. The initial height H ₀ is preferably set to about 0.2 m so that the subject P1 is surely sleeping even when the thickness of the bedding is taken into consideration. The initial height H ₀ is determined to be a sleeping state in a state where it is confirmed that the initial height H ₀ is equal to or greater than S% of the bed area 2A (a range indicated by black dots in a matrix corresponding to the bed plane in FIG. 7). Further, as reference data for making a specific situation determination of the subject with respect to this initial height H ₀ , as shown in FIG. 8, the range and situation in which the subject on the bed 2 moves is assumed. Thus, a plurality of comparison reference heights Hi (i: as shown in Table 1, each comparison reference height is distinguished using a subscript according to the state).

(Reference height for comparison Hi)
In order to determine what state the person P to watch over is on the bed, bedside, sickroom, etc., in the present invention, the height from the reference plane for determining the state of the object is compared. The reference height Hpi (p: location, i: situation) was defined, and the comparison reference height Hpi corresponding to each state was set as shown in the following table. The specific numerical values (setting values) in Table 1 are set from measurement data obtained from a sleeping state, a sitting state, and a standing state of a plurality of subjects. Note that the height adjustment value Hi applied in the determination method 2 described later is set separately from the comparison reference height Hpi based on the subject's physical information.

[Table 1]

The method for judging the situation of the target person or the like by the following monitoring functions (1) to (3) will be described with reference to FIG. 5 (overall flow), FIG. 6 (judgment method 1), and FIG. 11 (judgment method 2). To do.
After the start of the watching mode, when the motion sensor 11 recognizes the movement of the target person P, the detection camera 12 as a three-dimensional distance detection unit is activated to image the target space, and the target person P or the like 3D distance measurement is performed. Then, the difference between the height direction data h at each subdivided measurement point accumulated in each region and the reference height Hpi for comparison is detected (S130, S140). Based on the result, the situation of the target person or the like is determined by the following monitoring functions (1) to (3). As shown in FIG. 6, these situation determinations are performed in parallel in each of the bed area 2A, the bedside area 3A, and the floor area 4A (S200, S300, S400). The situation determination procedure will be described.

[Judgment of the situation of the target person, etc. by the watching function (judgment method 1)]
(1) Judgment of going to bed and getting up in the bed area 2A (FIG. 6: (S200, S210), FIG. 7 and FIG. 8)
First, as described above, as the initial stage, as shown in FIG. 7, as long as the initial height H ₀ is confirmed to be equal to or greater than S% of the bed area 2A, the subject P1 uses a sensor or the like. A continuous situation determination such as a patrol search is not made (S200). Here, when it is confirmed that the subject has moved, paying attention to the distance in the height direction in the bed area, the height direction data h is the comparison reference height Hb in Table 1 (for example, 0 as a set value) If it is set to 5m, it will not be affected by changes in height of less than 0.5m, such as turning over or jumping up on a futon, so you can avoid erroneous situation judgments.) If the ratio exceeds X%, It is possible to recognize the situation that the person P1 to be watched gets up in the bed 2. For example, in the state shown in FIGS. 8A and 8B, the height direction data h is equal to or less than the comparison reference height Hb, and the situation determination that the subject P1 is lying on the bed 2 is made. . FIG. 8C shows a sitting state in which the subject P1 raises the reclining 2a of the bed 2. FIG. 8 (d) shows a state where the subject P 1 is sitting on the edge of the bed 2. Under these conditions, the height direction data h obtained by the three-dimensional distance measurement (the area indicated by the black dots in the matrix in each figure) is in a state that exceeds the reference reference height Hb by more than X%, and is on the bed 2 It is determined that he has been woken up and seated. Then, if necessary, a notification that the target person P1 has woken up and sat down is made by a speaker, a mobile phone, an information display device, or the like (S210, S250).

(2) Judgment in the bedside area 3A (state of getting off the bed) (FIG. 6: (Step 300), situation of FIG. 9A)
When it is determined that the target person P1 is not on the bed 2, the situation is determined in the bedside area 3A (FIG. 3B). The obtained height direction data h is compared with the comparison reference heights Hs1 and Hs2 from the floor surface. When the height direction data h is the comparison reference height Hs1 (for example, 1.0 m) at the bedside 3 and the area ratio exceeds Z%, as shown in FIG. 3 can be determined to be standing, and the state (leaving from the bedside 3) is reported (S310, S350). On the other hand, when the area ratio of the bedside area in which the height direction data h is the comparison reference height Hs2 (for example, 0.2 m) at the bedside 3 exceeds Y%, as shown in FIG. The subject P2 falls from the bed 2 to the floor of the bedside 3 and determines that the subject P2 has fallen on the floor, and reports that the subject P2 is in a critical situation (S320, S360).

(3) Judgment in the floor area 4A (FIG. 6: (step 400), FIG. 10 (a), (b))
(3-1) When it is confirmed that the subject person is in the floor area, it is confirmed whether the subject person P1 is sleeping on the bed 2. When it is determined that the person is not sleeping on the bed (S410: No), the situation is determined in the floor area 4A (FIG. 3C). Specifically, the height direction data h is compared with the comparison reference heights Hf1 and Hf2 from the floor surface. When the height direction data h is the comparison reference height Hf1 (for example, 1.0 m) in the floor 4 and the area ratio exceeds Z%, as shown in FIG. It can be determined that the user is standing on the floor away, and the state (floor occupying the floor and walking) is reported (S420, S460). On the other hand, although the situation is not shown, when the area ratio of the height direction data h in the floor area 4A exceeds the reference percentage Hf2 (for example, 0.2 m) exceeds Y%, the situation is similar to FIG. 9B. Is determined to have occurred. That is, it is determined that the subject P3 falls while walking on the floor and is unable to get up and reports that the subject P3 is in a critical situation (S440, S470).

(3-2) In the case where the subject P1 is sleeping in the bed 2 (the initial height H ₀ is confirmed to be greater than or equal to S% of the bed area 2A) and the subject P3 is further detected In the floor area 4A (FIG. 3C), the height direction data h and the comparison reference height Hf1 are compared. When the ratio of the height direction data h of the subject P3 within the range of the comparison reference height Hf1 exceeds Z%, the subject P1 lies down on the bed 2 as shown in FIG. In this state, the situation where the visitor P3 has visited the floor 4 is confirmed (S410, S430). At this time, if the identity of the visitor P3 is unknown, the information about the entry into the floor 4 is reported, and at the same time, the security personnel and other related parties are notified (S450).

[Situation Judgment Method 2 for the Target Persons etc. by Watching Function]
The feature of the situation determination method 2 is that the situation determination is performed with reference to the adjustment value of the comparison reference height set based on the physical information of the subject and the threshold value table (Table 2).
Specifically, as shown in Table 2, the subject's weight (W), height (Ta) (institutions such as hospitals and nursing care facilities regularly take body measurement data, Based on the above, adjustment values H1 and H2 are set for the comparative reference height in consideration of physical characteristics, such as those who are heavy and tall and those who are light and short. The height is adjusted with respect to the comparative reference height Hpi shown in Table 1. Further, the threshold for determining the area ratio of the subject P is also changed. In general, weight and height are positively correlated, but people who are small but fat are less likely to detect changes in the sensor, so a higher threshold is set, and conversely, tall people tend to show large movements. Therefore, it is practical to set a lower threshold. Thereby, it is possible to improve the reliability of the situation determination by making a determination in consideration of the physical characteristics of the individual.

[Table 2]

  Therefore, as shown in the above table, in this embodiment, H1 and H2 are set as height adjustment values, and in determining the area ratio, the threshold value Xi (%) in the bed area is used as the threshold value. Situation judgments classified into levels of X1, X2, and X3 (X1> X2> X3) are made. Similarly, threshold values Yi and Zi (%) are also set.

[Judgment of the situation of the target person, etc. by the watch function (judgment method 2)]
Hereinafter, situation determination using the above-described adjustment value and threshold value will be described with reference to FIG.
(1) Sleeping in bed area, judgment of getting up (FIG. 11: (S200, S210), FIG. 7 and FIG. 8 situation of each figure)
First, as described above, as an initial stage, as shown in FIG. 7, while the initial height H ₀ is confirmed to be S% or more of the bed area 2A, a specific situation No judgment is made (S200). Here, when it is confirmed that the subject has moved, the height direction data h is compared with the comparison reference height Hb + Hi in Table 1 while paying attention to the distance in the height direction in the bed region. In this case, the subject having a fat body shape can perform more accurate height determination and area ratio determination than the fixed value set in the determination method 1. Specifically, as shown in FIGS. 8 (c) and 8 (d), when the subject P 1 is seated with the reclining 2 a of the bed 2 or sitting on the edge of the bed 2, the subject Applying the adjustment value and threshold value considering the body shape information, the height direction data h is confirmed to be in the state of the area ratio where the comparison reference height (Hb + Hi) exceeds Xi%, and wakes up on the bed 2, It is determined that he is seated. Then, if necessary, a notification that the target person P1 has woken up and sat down is made by a speaker, a mobile phone, an information display device, or the like (S210, S250).

(2) Judgment in bedside area (state of getting off bed) (FIG. 11: (step 300), situation of FIG. 9A)
When it is determined that the target person P1 is not on the bed 2, the situation is determined in the bedside area 3A (FIG. 3B). The obtained height direction data h is compared with the comparison reference heights Hs1 + Hi, Hs2 + Hi from the floor surface. When the height ratio data h is the reference reference height Hs1 + Hi (value considering the subject's physical information) at the bedside 3 and the area ratio exceeds Zi%, as shown in FIG. The person P2 can determine that the bedside 3 is standing on the floor, and reports the state (leaving from the bedside 3) (S310, S350). On the other hand, when the area ratio of the bedside area in which the height direction data h is the comparison reference height Hs2 + Hi at the bedside 3 exceeds Yi%, the subject P2 moves to the bed 2 as shown in FIG. It falls to the floor of the bedside 3 and judges that it has fallen on the floor, and reports that the subject P2 is in a critical situation (S320, S360).

(3) Judgment in the floor area (FIG. 11: (Step 400))
(3-1) When it is confirmed that the subject person is in the floor area, it is confirmed whether the subject person P1 is sleeping on the bed 2. When it is determined that the person is not sleeping on the bed (S410: No), the situation is determined in the floor area 4A (FIG. 3C). Specifically, the height direction data h is compared with the comparison reference heights Hf1 + Hi, Hf2 + Hi from the floor surface. When the height direction data h is the comparison reference height Hf1 + Hi in the floor 4 and the area ratio exceeds Zi%, as shown in FIG. 10 (a), the subject P3 stands on the floor away from the bed. It can be determined that it is present and the state (floor occupying the floor and walking) is reported (S420, S460). On the other hand, although the situation is not shown, when the area ratio of the height direction data h in the floor area exceeds the comparison reference height Hf2 + Hi exceeds Yi%, the situation is similar, as shown in FIG. 9B. The target person P3 falls while walking on the floor and determines that the target person P3 cannot stand up, and reports that the target person P3 is in a critical situation (S440, S470).

(3-2) In the case where the subject P1 is sleeping in the bed 2 (the initial height H ₀ is confirmed to be greater than or equal to S% of the bed area 2A) and the subject P3 is further detected In the floor area 4A (FIG. 3C), the height direction data h and the comparison reference height Hf1 + Hi are compared. When the ratio of the height direction data h of the subject P3 within the range of the comparative reference height Hf1 + Hi exceeds Zi%, the subject P1 lies down on the bed 2 as shown in FIG. In this state, the situation where the visitor P3 has visited the floor 4 is confirmed (S410, S430). At this time, if the identity of the visitor P3 is unknown, the information about the entry into the floor 4 is reported, and at the same time, the security personnel and other related parties are notified (S450).

  FIG. 12 shows the above-described determination method 2 in which the movement of the target person is recognized using the adjustment value of the comparative reference height based on the subject's physical information and the threshold value table (Table 2). In addition to the above, it is a block diagram of a determination method in which the determination is made in consideration of the action information of the target person and the determination of the correspondence to the target person can be performed with higher reliability.

  For example, as shown in Table 3, according to the walking speed WSp of the subject, the threshold (Ki) is ranked, and when the subject lies on the bed (enters the bed) from the standing state, On the contrary, the time required for a specific subject to perform a predetermined action from the time required for leaving the floor, in other words, the action holding time (= action required time (ActT)) is defined as a reference value (Tm1). By comparing, it can be acquired as the behavior information of the target person. Paying attention to the holding time (operation speed) in these movements, is the subject trying to get up from the bed slowly? Are you stuck? It is also possible to associate the determination with a threshold value (TMi) with a function or the like and make a determination based on the function. Thereby, it is possible to determine the situation to be handled without confirming the actual scene. The convenience and reliability of judgment can be improved.

[Table 3]

  As other judgment methods, by obtaining the shape information of wheelchairs used in living rooms and hospital rooms (height direction coordinates, plane occupancy area, seated and unoccupied volume, etc.) Can be obtained. In other words, if a sick person who has returned to the bedside by wheelchair alone is detected without a helper, then entering the bed means that a helper is needed, and the subject makes a nurse call. A nurse call is automatically made before the call is made. Conversely, there is a wheelchair on the bedside, and when it is detected that the subject has left the bed, a nurse call is automatically sent, and an assistant comes to the bedside and moves from the bed to the wheelchair. Can help with transfer.

  Next, an illumination control method using the above-described watching system will be described with reference to FIG. A hospital room or the like may be provided with a downlight individually on each bed in addition to the entire illumination such as a fluorescent lamp. A control method for dimming the downlight and the overall illumination based on information on the bed user's entering, sleeping, getting up, and getting out of bed will be described as an example. For example, when the subject gets up on the bed during the light-out time at night, the state of sitting on the bed is detected by the above-described situation determination. In that case, the light is dimmed to 10% of the brightest state of the downlight illuminance (hereinafter, this state is referred to as 10% dimming) and the light is turned on. This level of brightness allows the subject to check their personal surroundings. For example, if it is confirmed that the subject gets out of bed, the lighting is increased to 40%. In addition, the entire illumination up to the doorway is also lit at a predetermined illuminance to ensure the brightness of the room during movement. When going out of the room, the overall lighting can be dimmed. And if it goes to the toilet outside a sickroom and returns, the indoor lighting will be returned to 40% dimming, and the brightness during the movement to the bedside will be ensured. Then, sit down on the bedside, and when it is confirmed that you have laid down (bedded), turn the light down to 10% dimming, gradually lower the dimming rate, and turn off when sleep is confirmed .

  In addition, when a caregiver or the like enters before the subject leaves the floor, the light environment is set to 40% dimming so that the caregiver can easily work. As shown in FIG. 13, the dimming change rate is set to a relatively fast change rate when moving away from the next action, and for a while after entering the floor, It is preferable to make it gradually darker in order to ensure the brightness.

  In addition, this invention is not limited to the Example mentioned above, A various change within the range shown to each claim is possible. In other words, embodiments obtained by combining technical means appropriately changed within the scope of the claims are also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Indoor 2 Bed 3 Bedside 4 Floor 5 Ceiling surface 10 Target person condition detection means 11 Human sensor 12 Three-dimensional distance detection means (detection camera)
20 Data processing means 30 Result output means 2A Bed area 3A Bedside area 4A Floor areas P, P1, P2, P3

Claims (12)

The three-dimensional distance detection means capable of detecting the state of the subject to be watched in the room as information on the plane position and the height direction, and the height direction information obtained by the three-dimensional distance detection means A data processing means for partitioning into a bed area, a bedside area, and a floor area, comparing with a comparison reference height set corresponding to each area, and determining the status of the subject in each area; The data processing means comprises a determination result output means for reporting the status of the subject externally according to the status of the subject,
After confirming that the subject is present in the bed area, the comparison reference height set in the floor area around the bedside area is compared with the height direction information of the subject, and the area is compared. A monitoring system on a bed and in a room , wherein it is determined from the ratio that another subject is present in addition to the subject, and the situation is reported as necessary . The on-bed and indoor watch according to claim 1, wherein the comparison reference height and the threshold value for determining the situation of the subject are determined in consideration of the physical information of the subject. system. The on-bed and indoor watching system according to claim 1 or 2 , wherein a human sensor is arranged to detect that the subject is in the room. The three-dimensional distance detection means capable of detecting the state of the subject to be watched in the room as information on the plane position and the height direction, and the height direction information obtained by the three-dimensional distance detection means A data processing means for partitioning into a bed area, a bedside area, and a floor area, comparing with a comparison reference height set corresponding to each area, and determining the status of the subject in each area; The data processing means comprises a determination result output means for reporting the status of the subject externally according to the status of the subject,
An on-bed and indoor watching system characterized in that, in the determination of the situation of the target person, a comparison determination with a threshold value set according to the action required time information of the target person is added . The comparison reference height set in the bed area is compared with the height direction information of the subject, and it is determined from the area ratio that the subject is getting up on the bed, and if necessary, The on-bed and indoor watching system according to claim 4 , wherein a situation report is made . The comparison reference height set in the bedside area is compared with the height direction information of the subject, and the subject has left the bed from the area ratio or falls from the bed and falls down at the bedside The on- bed and indoor watching system according to claim 4 , wherein a determination is made as to whether or not the situation is present and the situation is reported as necessary . The comparison reference height set in the floor area around the bedside area is compared with the height direction information of the target person. From the area ratio, whether the target person is present in the floor, or floor 5. The on-bed and indoor watching system according to claim 4 , wherein a judgment is made as to whether or not the vehicle has fallen and the situation is reported as necessary . After confirming that the subject is present in the bed area, the comparison reference height set in the floor area around the bedside area is compared with the height direction information of the subject, and the area is compared. 5. The on- bed and indoor monitoring system according to claim 4 , wherein it is determined from the ratio that another target person is present in the room, and the situation is reported as necessary . 9. The comparison reference height and the threshold value for distinguishing between the situations are set in consideration of the physical information of the subject person , according to any one of claims 4 to 8 . On-bed and indoor watch system. The on-bed and indoor watching system according to any one of claims 4 to 9, wherein a human sensor is arranged to detect that the subject is in the room . 11. The bed and indoors according to claim 4, wherein the three-dimensional distance detection means is a detection camera provided on a ceiling surface and capable of focusing on multiple points. Watch system. Sensing the height direction information of the subject by the three-dimensional distance detecting means, bed according to claim 1 0, wherein the human sensor is subject is characterized in that it is carried out after it is detected that in the room Top and indoor watch system.

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