JP7487901B1 - Queue information providing system, method, and program - Google Patents

Abstract

[Problem] To provide a queue information system, method, and program that can improve user convenience. [Solution] In a queue information system (10), a queue identification unit (15) identifies a queue that has occurred in a "queue occurrence potential area" by identifying the next person in line starting from the first person at a specified starting point and identifying the next person in line from the first person to the last person based on the location of each person calculated based on an area image of the "queue occurrence potential area" captured by at least one camera, thereby identifying a queue that has occurred in the "queue occurrence potential area" and identifying the location of each person in the queue. Then, a display control unit (16) executes control to display a map showing the location of the last person in the queue identified by the queue identification unit (15). [Selected Figure] Figure 1

Description

This disclosure relates to a queue information providing system, method, and program.

Technology for managing queues has been proposed (for example, see Patent Document 1). In the technology disclosed in Patent Document 1, a planned queue line is planned to guide moving objects into the queue.

JP 2022-101924 A

However, the technology disclosed in Patent Document 1 may not be able to provide useful information to a user who is about to join a queue. For example, the user needs to go to the facility where the queue is formed and then follow the queue to find the end of the queue.

The object of the present disclosure is to provide a queue information providing system, method, and program that can improve user convenience. It should be noted that this object is merely one of multiple objects that the multiple embodiments disclosed in this specification aim to achieve. Other objects or problems and novel features will become apparent from the description of this specification or the accompanying drawings.

In one aspect, the queue information system includes:
A first acquisition unit that acquires an area image captured by at least one camera of an area where a procession from a predetermined starting point is expected to occur;
A detection unit that detects an image of each person included in the area image;
an extraction unit that extracts features from the detected images of each person;
a first calculation unit that calculates a presence position of each person based on a position of the at least one camera and an image position of an image of each person detected in the area image;
a queue identification unit that identifies a queue occurring in the area by identifying the next person in order from the first person at the specified starting point to the last person based on the calculated location of each person, and also identifies the location of each person included in the identified queue;
a display control unit that executes control to display a map showing the location of the last person in the identified queue;
Equipped with:

In another aspect, a method performed by a queue information providing system includes:
Based on the location of each person calculated based on an area image captured by at least one camera in an area where a queue is expected to occur from a predetermined starting point, a queue is identified in the area by identifying the next person in line starting from the first person at the predetermined starting point and identifying the first person to the last person, thereby identifying the queue occurring in the area and identifying the location of each person included in the identified queue;
Executing control to display a map showing the location of the last person in the identified queue; and
including.

In another aspect, the program further comprises:
Based on the location of each person calculated based on an area image captured by at least one camera in an area where a queue is expected to occur from a predetermined starting point, a queue is identified in the area by identifying the next person in line starting from the first person at the predetermined starting point and identifying the first person to the last person, thereby identifying the queue occurring in the area and identifying the location of each person included in the identified queue;
Executing control to display a map showing the location of the last person in the identified queue; and
The process includes the steps of:

This disclosure provides a queue information system, method, and program that can improve user convenience.

FIG. 1 is a diagram illustrating an example of a queue information providing system according to a first embodiment. 5 is a flowchart showing an example of a processing operation of the queue information providing system in the first embodiment. FIG. 11 is a diagram illustrating an example of a queue information providing system according to a second embodiment. FIG. 11 is a diagram illustrating an example of a queue information table in the second embodiment. 13 is a flowchart showing an example of a processing operation (creation (updating) of a queue information table) of the queue information providing system in the second embodiment. 13 is a flowchart showing an example of a processing operation (calculation of a predicted waiting time) of the queue information providing system in the second embodiment. 13 is a flowchart showing an example of a processing operation (display control) of the queue information providing system in the second embodiment. FIG. 13 is a diagram illustrating an example of a queue information providing system according to a third embodiment. 13 is a flowchart showing an example of a processing operation of the queue information providing system in the third embodiment. FIG. 1 is a diagram illustrating an example of the configuration of a queue information providing system.

Hereinafter, the embodiments will be described with reference to the drawings. In the embodiments, the same or equivalent elements are given the same reference numerals, and duplicate descriptions will be omitted.

First Embodiment
<Example of queue information system configuration>
Fig. 1 is a diagram showing an example of a queue information providing system in the first embodiment. In Fig. 1, the queue information providing system 10 includes an acquisition unit 11, a detection unit 12, an extraction unit 13, a calculation unit 14, a queue identification unit 15, and a display control unit 16.

The acquisition unit 11 acquires an "area image" captured by at least one camera (not shown) of an area where a queue is expected to form from a "predetermined starting point" (hereinafter sometimes referred to as a "potential queue occurrence area"). For example, in a facility such as a baseball stadium, the corridor in front of the restroom, the corridor in front of the concession stand, etc. could each be a "potential queue occurrence area." If the "potential queue occurrence area" is the corridor in front of the restroom, the "predetermined starting point" is, for example, the entrance to the restroom. If the "potential queue occurrence area" is the corridor in front of the concession stand, the "predetermined starting point" is, for example, in front of the cash register at the concession stand.

The detection unit 12 detects images of each person (e.g., facial images of each person) included in the "area image" acquired by the acquisition unit 11.

The extraction unit 13 extracts "feature amounts" from the image of each person detected by the detection unit 12. The extracted "feature amounts" are used as information for identifying people.

The calculation unit 14 calculates the location of each person based on the location of the at least one camera (not shown) and the image location in the area image of each person detected by the extraction unit 13. For example, if the internal and external parameters of the camera (not shown) used to capture the "area image" are known, the image location can be converted to a location in the world coordinate system. This makes it possible to calculate the location of each person.

The queue identification unit 15 identifies a "queue" occurring in the queue occurrence candidate area based on the location of each person calculated by the calculation unit 14. For example, the queue identification unit 15 identifies the "queue" by identifying the next person in order from the first person present at the "predetermined starting point" to the last person. Specifically, the queue identification unit 15 identifies a person present at a position that overlaps (matches) the position of the "predetermined starting point" as the first person in the queue. Then, the queue identification unit 15 identifies a person present at a position that is a predetermined value or less away from the location of the identified first person as the next person in order relative to the first person. At this time, the queue identification unit 15 may identify the next person in order taking into account the pattern of the queue (for example, the direction in which it extends, etc.). Then, the queue identification unit 15 identifies the queue by repeating the process of identifying the next person in order relative to the person included in the last identified queue. Then, when the queue identification unit 15 cannot identify the person next in line to the person included in the last identified queue, it identifies the person included in the last identified queue as the person at the end.

By identifying the queue in this way, the queue identification unit 15 can identify the queue that has occurred in the area as well as the location of each person in the queue.

The display control unit 16 executes control to display a map showing the location of the last person in the queue identified by the queue identification unit 15. Through this control, for example, a map showing the location of the last person is displayed on a display device (not shown). The display device (not shown) may be, for example, a display installed in the facility, or may be a terminal (such as a smartphone) held by a user who wishes to view the map.

The above-described configuration of the queue information system 10 allows users to obtain information about the location of the last person in line, thereby improving user convenience.

Here, the queue information providing system 10 may be composed of one or more devices. That is, any combination of the acquisition unit 11, detection unit 12, extraction unit 13, calculation unit 14, queue identification unit 15, and display control unit 16 of the queue information providing system 10 may be distributed and arranged in one or more devices. For example, the acquisition unit 11, detection unit 12, extraction unit 13, calculation unit 14, and queue identification unit 15 may be included in a queue identification device (not shown), and the display control unit 16 may be included in a server device (not shown).

In addition, if there are multiple potential queue areas, the queue information system 10 may perform the above process for each potential queue area.

<Example of queue information system operation>
FIG. 2 is a flowchart showing an example of a processing operation of the queue information providing system in the first embodiment.

The acquisition unit 11 acquires an "area image" in which an area where a queue from a "predetermined starting point" is expected to occur is photographed by at least one camera (not shown) (step S11).

The detection unit 12 detects images of each person included in the "area image" acquired by the acquisition unit 11 (step S12).

The extraction unit 13 extracts features from the images of each person detected by the detection unit 12 (step S13).

The calculation unit 14 calculates the location of each person based on the location of at least one camera (not shown) and the image location in the area image of each person detected by the extraction unit 13 (step S14).

Based on the location of each person calculated by the calculation unit 14, the queue identification unit 15 identifies the "queue" occurring in the queue occurrence candidate area, as well as the location of each person included in the queue (step S15).

The display control unit 16 executes control to display a map showing the location of the last person in the queue identified by the queue identification unit 15 (step S16).

As described above, according to the first embodiment, the queue identification unit 15 in the queue information system 10 identifies a queue that has occurred in a "queue occurrence potential area" by identifying the next person in line, starting from the first person at a specified starting point, and then identifying the next person in line from the first person to the last person, based on the location of each person calculated based on an area image of the "queue occurrence potential area" captured by at least one camera, thereby identifying a queue that has occurred in the "queue occurrence potential area" and identifying the location of each person in the queue. Then, the display control unit 16 executes control to display a map showing the location of the last person in the queue identified by the queue identification unit 15.

This configuration of queue information system 10 allows users to obtain information about the location of the last person in line, improving user convenience.

Second Embodiment
The second embodiment relates to a more specific embodiment.

<Example of queue information system configuration>
Fig. 3 is a diagram showing an example of a queue information system in the second embodiment. In Fig. 3, a queue information system 20 includes an acquisition unit 11, a detection unit 12, an extraction unit 13, a calculation unit 14, a queue identification unit 15, a formation unit 21, a storage unit 22, a calculation unit 23, and a display control unit 24.

The forming unit 21 forms "queue information (queue information table 22A)" and stores the formed "queue information (queue information table 22A)" in the storage unit 22. FIG. 4 is a diagram showing an example of a queue information table in the second embodiment. As shown in FIG. 4, the queue information table 22A includes a plurality of entries arranged according to the order of people in the queue identified by the queue identification unit 15. Each entry includes the feature amount (e.g., face identification information) and the location (location coordinates) of each person included in the queue identified by the queue identification unit 15. Also, as shown in FIG. 4, the first entry in the queue information table 22A may be assigned a "head flag". Furthermore, the first entry in the queue information table 22A may include the time when the head flag was assigned (i.e., the time when it became the head). Also, the last entry in the queue information table 22A may be assigned a "tail flag". Also, an ID may be assigned to the feature amount (e.g., face identification information) of each person. Note that, when there are a plurality of queue generation candidate areas, "queue information (queue information table 22A)" is formed for each queue generation candidate area.

Here, the acquisition unit 11 acquires an area image at a predetermined cycle. Then, the detection unit 12, the extraction unit 13, the calculation unit 14, and the matrix identification unit 15 execute processing at a predetermined cycle based on the area image acquired at the predetermined cycle. Then, the formation unit 21 updates the "matrix information (matrix information table 22A)" at a predetermined cycle using information obtained by the processing executed at the predetermined cycle by the detection unit 12, the extraction unit 13, the calculation unit 14, and the matrix identification unit 15.

The calculation unit 23 calculates the predicted waiting time in the queue based on the "turning time" and the number of people in the queue. The "turning time" may be the time from when the first person at the head of the queue becomes the head to when the second person following the first person becomes the head, or the average value of this time. For example, the calculation unit 23 may measure the "turning time" by receiving a notification from the formation unit 21 when an entry with a head flag changes, and measuring the time between the timing of one successive notification and the timing of the next notification. The calculation unit 23 may also count the number of people in the queue by counting the number of entries in the "queue information (queue information table 22A)".

The display control unit 24 executes control to display a map showing the location of the last person in the queue and the estimated waiting time calculated by the calculation unit 23. Through this control, for example, a map showing the location of the last person in the queue and the estimated waiting time is displayed on a display device (not shown). The display device (not shown) may be, for example, a display installed in the facility, or may be a terminal (such as a smartphone) held by a user who wishes to view the map.

<Example of queue information system operation>
An example of the processing operation of the queue information providing system 20 having the above configuration will be described.

(Create (update) queue information table)
5 is a flowchart showing an example of a processing operation (creation (updating) of a queue information table) of the queue information providing system in the second embodiment. The processing flow shown in FIG. 5 may be repeated at a predetermined period (for example, a "first period").

The acquisition unit 11 acquires an "area image" in which an area where a queue from a "predetermined starting point" is expected to occur is photographed by at least one camera (not shown) (step S21).

The detection unit 12 detects images of each person included in the "area image" acquired by the acquisition unit 11 (step S22).

The extraction unit 13 extracts features from the images of each person detected by the detection unit 12 (step S23).

The calculation unit 14 calculates the location of each person based on the location of at least one camera (not shown) and the image location in the area image of each person detected by the extraction unit 13 (step S24).

Based on the location of each person calculated by the calculation unit 14, the queue identification unit 15 identifies the "queue" occurring in the queue occurrence candidate area, as well as the location of each person included in the queue (step S25).

The formation unit 21 forms a queue information table 22A and stores the formed queue information table 22A in the storage unit 22. Note that if a queue information table 22A for the corresponding queue is already stored in the storage unit 22, the formation unit 21 updates the queue information table 22A already stored with the newly created queue information table 22A.

The queue information system 20 may acquire an "area image" at a second period shorter than the first period, and identify the image position in the "area image" of the image of each person corresponding to each feature of the queue information table 22A stored in the memory unit 22. The queue information system 20 may then calculate the location of each person based on the position of the at least one camera (not shown) and the image position in the "area image" of the identified image of each person. The queue information system 20 may then update the location value of the corresponding entry based on the calculated location of each person.

(Calculation of Estimated Waiting Time)
FIG. 6 is a flowchart showing an example of a processing operation (calculation of a predicted waiting time) of the queue information providing system in the second embodiment.

The calculation unit 23 measures the "rotation time" (step S31).

The calculation unit 23 counts the number of people in the queue using the queue information table 22A (step S32).

The calculation unit 23 calculates the predicted waiting time in the queue based on the "turning time" and the number of people in the queue (step S33). Note that the average value of the measured "turning time" may be used to calculate the predicted waiting time.

(Display control)
7 is a flowchart showing an example of the processing operation (display control) of the queue information providing system in the second embodiment. Here, a case where a display request is received from a user terminal will be described as an example.

For example, the user operates the terminal to display a map of the facility on the terminal display and specify the facility that the user wants to check. As a result, the terminal forms a display request signal that includes information about the specified facility (specified facility identification information) and transmits the formed display request signal to the queue information system 20.

The display control unit 24 receives a display request signal sent from the user's terminal (step S41).

The display control unit 24 refers to the queue information table 22A corresponding to the facility indicated by the specified facility identification information included in the display request signal to obtain the location of the last person (step 42).

The display control unit 24 obtains the predicted waiting time calculated by the calculation unit 23 for the queue corresponding to the facility indicated by the information included in the display request signal (step S43).

The display control unit 24 forms a display control signal including the location of the last person acquired in step S42 and the predicted waiting time acquired in step S43 (step S44). This display control signal is transmitted to the user's terminal. The terminal that receives this display control signal displays the location of the last person and the predicted waiting time included in the display control signal on the map displayed on the display.

Third Embodiment
The third embodiment relates to an embodiment for searching for a person waiting in a queue. Hereinafter, the person to be searched for may be simply referred to as a "target person."

<Example of queue information system configuration>
Fig. 8 is a diagram showing an example of a queue information system in the third embodiment. In Fig. 8, the queue information system 30 includes an acquisition unit 11, a detection unit 12, an extraction unit 13, a calculation unit 14, a queue identification unit 15, a formation unit 21, a storage unit 22, a reception unit 31, an identification unit 32, a calculation unit 33, and a response signal formation unit 34.

The reception unit 31 receives a request signal requesting to search for a target person (hereinafter, sometimes referred to as a "search request signal"). The search request signal includes, for example, facial features of the target person.

The identification unit 32 identifies the target's location and the target's order in the queue by identifying an entry corresponding to the target based on the facial features of the target included in the search request signal and the queue information table 22A. Note that if multiple queue information tables 22A each corresponding to a different queue are stored in the storage unit 22, the queue in which the target is standing can be identified by identifying a queue information table 22A that includes features matching the facial features of the target included in the search request signal.

The calculation unit 33 measures the "turning time" of the queue corresponding to each queue information table 22A. The calculation unit 33 then calculates the predicted waiting time of the target person based on the "turning time" and the position in the queue of the target person identified by the identification unit 32.

The response signal forming unit 34 forms a response signal including the location of the target person identified by the identifying unit 32 and the predicted waiting time of the target person calculated by the calculating unit 33. The response signal forming unit 34 then transmits the response signal toward the sender of the search request signal.

<Example of queue information system operation>
An example of the processing operation of the queue information system 30 having the above configuration will be described. Fig. 9 is a flowchart showing an example of the processing operation of the queue information system in the third embodiment. Fig. 9 shows an example of the processing operation for searching for people waiting in a queue.

For example, a user operates a terminal to send a search request signal including facial features of a target person to be searched for to queue information system 30. The target person may be, for example, a family member or friend of the user. The facial features of the target person may be acquired in advance by the user using the terminal and stored in the terminal. The user may operate the terminal to send a search request signal including photo data of family and friends stored in the terminal to queue information system 30.

The reception unit 31 receives a search request signal transmitted from the terminal (step S51).

The identification unit 32 identifies the target person's location and the target person's order in the queue by identifying an entry corresponding to the target person based on the facial features of the target person included in the search request signal and the queue information table 22A (step S52).

The calculation unit 32 calculates the predicted waiting time of the target person based on the "turning time" and the position in the queue of the target person identified by the identification unit 32 (step S53).

The response signal forming unit 34 forms a response signal including the location of the target person identified by the identifying unit 32 and the target person's predicted waiting time calculated by the calculating unit 33 (step S54). The response signal forming unit 34 then transmits the response signal to the terminal that transmitted the search request signal (step S55). This allows the user to know where in the queue the target person is standing and how long it will take for him or her to get out of the queue.

<Other embodiments>
Fig. 10 is a diagram showing an example of the configuration of a queue information system. In Fig. 10, the queue information system 100 has a processor 101 and a memory 102. The processor 101 may be, for example, a microprocessor, a micro processing unit (MPU), or a central processing unit (CPU). The processor 101 may include a plurality of processors. The memory 102 is configured by a combination of a volatile memory and a non-volatile memory. The memory 102 may include a storage located away from the processor 101. In this case, the processor 101 may access the memory 102 via an I/O interface not shown.

The queue information providing systems 10, 20, and 30 of the first to third embodiments may each have the configuration shown in FIG. 10. The acquisition unit 11, detection unit 12, extraction unit 13, calculation unit 14, queue identification unit 15, display control unit 16, 24, formation unit 21, calculation unit 23, reception unit 31, identification unit 32, calculation unit 33, and response signal formation unit 34 of the queue information providing systems 10, 20, and 30 of the first to third embodiments may be realized by the processor 101 reading and executing a program stored in the memory 102. The storage unit 22 may be realized by the memory 102. The program can be stored using various types of non-transitory computer readable media and supplied to the queue information providing systems 10, 20, and 30. Examples of the non-transitory computer readable medium include magnetic recording media (e.g., flexible disks, magnetic tapes, hard disk drives) and magneto-optical recording media (e.g., magneto-optical disks). Further examples of non-transitory computer readable media include CD-ROM (Read Only Memory), CD-R, and CD-R/W. Further examples of non-transitory computer readable media include semiconductor memory. Semiconductor memory includes, for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, and RAM (Random Access Memory). The program may also be provided to the queue information system 10, 20, 30 by various types of transitory computer readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves. The transitory computer readable media can provide the program to the queue information system 10, 20, 30 via wired communication paths such as electrical wires and optical fibers, or wireless communication paths.

The present invention has been described above with reference to the embodiment, but the present invention is not limited to the above. Various modifications that can be understood by a person skilled in the art can be made to the configuration and details of the present invention within the scope of the invention.

LIST OF SYMBOLS 10 Queue information providing system 11 Acquisition unit 12 Detection unit 13 Extraction unit 14 Calculation unit 15 Queue identification unit 16 Display control unit 20 Queue information providing system 21 Formation unit 22 Storage unit 22A Queue information table 23 Calculation unit 24 Display control unit 30 Queue information providing system 31 Reception unit 32 Calculation unit 32 Identification unit 33 Calculation unit 34 Response signal formation unit

Claims (8)

A first acquisition unit that acquires an area image captured by at least one camera of an area where a procession from a predetermined starting point is expected to occur;
A detection unit that detects an image of each person included in the area image;
an extraction unit that extracts features from the detected images of each person;
a first calculation unit that calculates a presence position of each person based on a position of the at least one camera and an image position of an image of each person detected in the area image;
a queue identification unit that identifies a queue occurring in the area by identifying the next person in order from the first person at the specified starting point to the last person based on the calculated location of each person, and also identifies the location of each person included in the identified queue;
a display control unit that executes control to display a map showing the location of the last person in the identified queue;
a formation unit that forms queue information including a plurality of entries, each of which includes the feature amount and the location of each person included in the specified queue, and which are arranged according to the order of the people in the specified queue;
a reception unit that receives a request signal for searching for a target person, the request signal including facial features of the target person;
an identification unit that identifies an entry corresponding to the target person based on the facial feature amount of the target person and the formed matrix information, thereby identifying a location of the target person and a rank of the target person in the matrix;
a third calculation unit that calculates a predicted waiting time of the target person based on a time from a time when a first person at the head of the specified queue becomes the head to a time when a second person next in line to the first person becomes the head, and the specified order;
a response signal forming unit that forms a response signal to the request signal, the response signal including the location of the identified target person and the calculated predicted waiting time of the target person;
A queue information providing system comprising: The method further includes a second calculation unit that calculates a predicted waiting time in the queue based on a time from when a first person at the head of the identified queue becomes the head to when a second person next in line to the first person becomes the head, and the number of people included in the queue.
2. The queue information providing system according to claim 1. the queue identification unit identifies a queue occurring in the area at a predetermined period and identifies a location of each person included in the identified queue;
The formation unit updates the matrix information at the predetermined period.
2. The queue information providing system according to claim 1 . a second calculation unit that calculates a predicted waiting time in the queue based on a time from a time when a first person at the head of the identified queue becomes the head to a time when a second person next in line to the first person becomes the head, and a number of people included in the queue,
The display control unit executes control to display a map showing a location of the last person in the queue and the predicted waiting time.
4. The queue information providing system according to claim 3 . A method performed by a queue information providing system, comprising:
Based on the location of each person calculated based on an area image captured by at least one camera in an area where a queue is expected to occur from a predetermined starting point, a queue is identified in the area by identifying the next person in line starting from the first person at the predetermined starting point and identifying the first person to the last person, thereby identifying the queue occurring in the area and identifying the location of each person included in the identified queue;
forming queue information including a plurality of entries, each of which includes a feature amount and the location of each person included in the specified queue, and which are arranged according to the order of the people in the specified queue;
Executing control to display a map showing the location of the last person in the identified queue; and
receiving a request signal for searching for a target person, the request signal including facial features of the target person;
Identifying an entry corresponding to the target person based on the facial feature amount of the target person and the formed matrix information, thereby identifying a location of the target person and a rank of the target person in the matrix;
Calculating a predicted waiting time for the target person based on a time from when a first person at the head of the identified queue becomes the head to when a second person next in line to the first person becomes the head, and based on the identified order;
forming a response signal to the request signal, the response signal including a location of the identified target person and a predicted waiting time of the target person;
The method includes: and calculating a predicted waiting time in the queue based on a time from when a first person at the head of the identified queue becomes the head to when a second person next in line to the first person becomes the head, and the number of people included in the queue.
The method of claim 5 . Based on the location of each person calculated based on an area image captured by at least one camera in an area where a queue is expected to occur from a predetermined starting point, a queue is identified in the area by identifying the next person in line starting from the first person at the predetermined starting point and identifying the first person to the last person, thereby identifying the queue occurring in the area and identifying the location of each person included in the identified queue;
forming queue information including a plurality of entries, each of which includes a feature amount and the location of each person included in the specified queue, and which are arranged according to the order of the people in the specified queue;
Executing control to display a map showing the location of the last person in the identified queue; and
receiving a request signal for searching for a target person, the request signal including facial features of the target person;
Identifying an entry corresponding to the target person based on the facial feature amount of the target person and the formed matrix information, thereby identifying a location of the target person and a rank of the target person in the matrix;
Calculating a predicted waiting time for the target person based on a time from when a first person at the head of the identified queue becomes the head to when a second person next in line to the first person becomes the head, and the identified order;
forming a response signal to the request signal, the response signal including a location of the identified target person and a predicted waiting time of the target person;
A program for causing a queue information providing system to execute a process including the steps of: The process further includes calculating an estimated waiting time in the queue based on a time from when a first person at the head of the identified queue becomes the head to when a second person who is next in line to the first person becomes the head, and a number of people included in the queue.
The program according to claim 7 .

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