The invention relates to a monitoring system for monitoring

5 human activities, comprising a multiple number of presence detection

sensors mounted in a residence, further comprising a control unit

communicately connected to the presence detection sensors and arranged for receiving presence data from the presence detection sensors.

Monitoring systems including sensors and a control unit are e.g.0 known from patent publication US 2017/0078298 and can be used to secure premises, such as an office, a warehouse, a factory and other public or private premises. Further, monitoring systems are known for monitoring human activities, e.g. for tracking a presence of persons in a building, as e.g. disclosed in European patent EP 2 353 153 B1 mentioning the same

5 inventor.

It is an object of the present invention to provide an improved system for monitoring human activities. Thereto, according to the invention, the control unit is further arranged for determining, from the received presence data, whether the inhabitant of the residence stays indoors or0 outdoors and for determining a time interval of an outdoor stay.

By determining whether the inhabitant of the residence stays indoors or outdoors and by determining a time interval of an outdoor stay, relevant information about human activities of the resident can be obtained in a relatively easy way.

5 The invention is at least partly based on the insight that by

specifically interpreting presence detection sensors mounted in a residence, highly relevant data about outdoor stay of the inhabitant can be obtained in relatively easy, cheap though accurate way. Further, outdoor stay data can be processed for evaluating social interaction behaviour of the inhabitant,0 e.g. for detection of a trend in social isolation that may be early indicator of dementia. The invention also relates to a method of monitoring human activities.

Further, the invention relates to a computer program product. A computer program product may comprise a set of computer executable instructions stored on a data carrier, such as a CD or a DVD. The set of computer executable instructions, which allow a programmable computer to carry out the method as defined above, may also be available for

downloading from a remote server, for example via the Internet.

Further advantageous embodiments according to the invention are described in the following claims.

It should be noted that the technical features described above or below may each on its own be embodied in a system or method, i.e. isolated from the context in which it is described, separate from other features, or in combination with only a number of the other features described in the context in which it is disclosed. Each of these features may further be combined with any other feature disclosed, in any combination.

The invention will now be further elucidated on the basis of a number of exemplary embodiments and an accompanying drawing. In the drawing:

Fig. 1 shows a schematic view of a monitoring system according to the invention, and

Fig. 2 shows a flow chart of a method according to the invention.

It is noted that the figures show merely preferred embodiments according to the invention. In the figures, the same reference numbers refer to equal or corresponding parts.

Figure 1 shows a schematic view of a monitoring system 1 according to the invention. The system 1 is arranged for monitoring human activities, and comprises a multiple number of presence detection sensors 2a-e mounted in a residence of a user of the system 1. Further, the system 1 comprises a multiple number of communication lines 3a-e, each the communication lines 3a-d being connected, at a first end, to a respective presence detection sensor. The system 1 also has a control unit 4 that is connected to a second end, opposite to the first end, of the communication lines 3a-e for communicately connecting the control unit 4 to the presence detection sensors 2a-e. The control unit 4 is arranged for receiving presence data from the presence detection sensors 2a-e, via said communication lines 3a-d.

In the embodiment shown in Fig. 1, the sensors 2 and the control unit 4 are communicately connected via a star-shaped structure. However, the communication structure can be implemented in various other ways, e.g. by using a ring-shaped structure. Further, wired or wireless communication channels can be applied.

The presence detection sensors 2 may include a single or a multiple number of door sensors, infrared motion sensors, other activity sensors and/or occupancy sensors.

During operation of the system 1, the presence detection sensors 2 sense a physical parameter, e.g. infrared signals, and transmit said sensed parameter as presence data towards the control unit 4. The sensors 2 may operate in a continuous manner or intermittently e.g. at regular time intervals. Further, the sensors may transmit the presence data immediately upon sensing or at a later instant, e.g. at regular time intervals.

The control unit 4 is arranged for determining, from the received presence data, whether a person living in the residence, also referred to as the inhabitant of the residence stays indoors or outdoors. Also, the control unit 4 is arranged for determining a time interval of an outdoor stay.

The control unit 4 can be implemented as a single integrated unit, as shown in Fig. 1. Alternatively, the control unit 4 is composed of two or more separate units, in a distributed manner. As an example, the control unit 4 includes a residence module for receiving the presence data from the sensors and a central unit located at a central location in the residence or remotely outdoors for performing the step of determining whether the inhabitant is indoors or outdoors and of determining a time interval of an outdoor stay. The residence module is connected to the central unit, e.g. via Internet or another network such as a local are network, LAN, for

transmitting the received presence data. Optionally, the central unit is connected to a multiple number of residence modules for monitoring human activities in respective residences.

Further, the control unit 4 may be arranged for transmitting further signals, based on the determined data regarding outdoor stay of the inhabitant.

The control unit 4 may determine that the inhabitant of the residence stays outdoors in a number of ways, e.g. by detecting that a front door has opened and closed and that, after the door has closed, no activities have been detected anymore. Similarly, the control unit 4 may determine that the inhabitant enters the residence, and is thus indoors, after the front door has opened and closed, after an outdoor time period, and activities of the user indoors are sensed.

Further, the time interval of an outdoor stay can be determined by detecting, from the received presence data, an inhabitant’s departure from and an inhabitant’s arrival to the residence.

The control unit 4 can further be arranged for counting a number of outdoor stays having a time interval that is longer than a predetermined threshold time period. As an example, a number of outdoor stays longer than circa three hours can be counted, e.g. per day, week or another time period. As another example, the predetermined threshold time period can be less than three hours, e.g. two hours, or more than three hours, e.g. four hours. If an outdoor stay lasts longer than the predetermined threshold time period, it is assumed that the inhabitant contributes in a social event such as an outdoor visit. Optionally, the control unit 4 is further arranged for counting a number of home visits, by non-inhabitant visitors, in the residence of the inhabitant. As an example, the home visits can be counted by comparing detection data of the front door being opened and closed with multiple simultaneous activities sensed in the residence, e.g. at separate locations in the residence.

Also, the control unit 4 can be arranged for determining a social interaction indicator SII based on a total number of counted outdoor stays OS, i.e. the outdoor stays that have a time interval longer than the predetermined threshold time period, and/or counted home visits HV in an evaluation time period. As an example, the evaluation time period is a week so that a total number of counted outdoor stays OS and counted home visits HV in a week can be determined. Preferably, the total number of counted outdoor stays OS are added to the counted home visits HV in a weighted manner, e.g. by multiplying the counted outdoor stays OS with a first weighing factor fl and the counted home visits HV by a weighing factor f2, before adding. Alternatively, the total number of counted outdoor stays OS and counted home visits HV are just added, or the social interaction indicator SII is calculated by multiplying the number of counted outdoor stays OS by the number of counted home visits HV. In principle, the social interaction indicator SII may be based on the number of counted outdoor stays OS only, or may be based on the number of counted home visits HV only.

Preferably, the control unit 4 is arranged for determining the social interaction indicator SII in subsequent evaluation time periods, such that an evolution of the social interaction indicator SII can be monitored. In another embodiment, the social interaction indicator SII is not determined in subsequent evaluation time periods, but over other evaluation time periods, e.g. at predetermined intervals or upon a request of a user of the system 1. The control unit 4 can be arranged for transmitting further signals, based on the determined social interaction indicator SII or on a time dependent evolution of the determined social interaction indicator SII over time. As an example, the control unit 4 may send an information signal to a software platform, e.g. via a communication channel connecting the control unit 4 to a device on which said software platform is running, such as a local device having Internet connectivity or access to telephone services, informing relatives and/or professional caregivers about a trend in social interaction indicator values of the resident, e.g. via a software service such as an app. Advantageously, such a trend in social interaction can thus be detected automatically and in a privacy friendly manner, as specific data on individual entering and leaving events can be filtered out. By informing a relative and/or professional caregiver about any negative/decreasing social interaction trend in an early stage, preventive measures can be taken to the resident.

Optionally, the control unit 4 can be arranged for informing the resident that an information signal has been transmitted to a relative and/or professional caregiver, e.g. via an optical indicator.

Figure 2 shows a flow chart of a method according to the invention. The method is used for monitoring human activities. The method 100 comprises a step of providing 110 a multiple number of presence detection sensors mounted in a residence, a step of providing 120 a control unit communicately connected to the presence detection sensors, a step of receiving 130 presence data from the presence detection sensors, and a step of determining 140, from the received presence data, whether the inhabitant of the residence stays indoors or outdoors and determining a time interval of an outdoor stay.

The step of receiving presence data from the presence detection sensors, and the step of determining, from the received presence data, whether the inhabitant of the residence stays indoors or outdoors and ί determining a time interval of an outdoor stay can be performed using dedicated hardware structures, such as FPGA and/or ASIC components. Otherwise, the method can at least partially be performed using a computer program product comprising instructions for causing a processor of a computer system to perform the above described steps. A number of steps can in principle be performed on a single processor. However it is noted that at least one step can be performed on a separate processor, e.g. the step of receiving presence data.

The invention is not restricted to the embodiments described above. It will be understood that many variants are possible.

These and other embodiments will be apparent for the person skilled in the art and are considered to fall within the scope of the invention as defined in the following claims. For the purpose of clarity and a concise description features are described herein as part of the same or separate embodiments. However, it will be appreciated that the scope of the invention may include embodiments having combinations of all or some of the features described.