Area safety level evaluation device and area safety level evaluation program

Abstract

To provide an area safety level evaluation device capable of comprehensively evaluating a safety level for each small area into which a monitoring area is divided.SOLUTION: An area safety level evaluation device 1 evaluates a safety level of a monitoring area in which multiple monitoring cameras 202 are installed. The area safety level evaluation device 1 includes: an anxiety level calculation unit 120 configured to calculate, for each small area, an anxiety level indicating the degree of anxiety felt by a person based on environmental elements of the monitored area; a monitoring level calculation unit 121 configured to calculate, for each small area, a monitoring level by the monitoring cameras 202 based on monitoring ranges and monitoring performances of the multiple monitoring cameras 202; and a safety level calculation unit 122 configured to calculate a safety level for each small area by converting the anxiety level for each small area and the monitoring level for each small area into the safety level in small area units.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an area safety level evaluation device and an area safety level evaluation program. [Background technology]

[0002] Conventionally, various methods have been developed for evaluating the safety level, which indicates the possibility or probability of being a victim of a crime, for each area. For example, Patent Document 1 discloses a crime prevention map in which a crime prevention evaluation value is calculated for each area of ​​a street according to the number and dimensions of windows of buildings facing the street. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-36745 A Summary of the Invention [Problem to be solved by the invention]

[0004] The crime prevention evaluation value in the crime prevention map disclosed in Patent Document 1 is calculated according to the number and dimensions of windows of a building. Here, information that is useful for determining the safety level for each area includes not only the number and dimensions of windows of a building, but also, for example, the degree of anxiety felt by people from the environment at that location, and the monitoring range and monitoring performance of an imaging device such as a surveillance camera installed at that location (for example, whether the area is within the surveillance range of the surveillance camera, whether the resolution of the surveillance camera is high, etc.). However, since the crime prevention evaluation value disclosed in Patent Document 1 does not reflect information other than the number and dimensions of windows of a building, it is not possible to calculate a comprehensive evaluation value as a safety level.

[0005] The present invention has been made in consideration of the above circumstances, and aims to provide an area safety level evaluation device and an area safety level evaluation program that enable comprehensive evaluation of the safety level of each small area into which a monitoring area is divided. [Means for solving the problem]

[0006] The present invention solves the above-mentioned problems, and provides an area safety level assessment device according to an embodiment of the present invention, An area safety level evaluation device for evaluating a safety level of a monitoring area in which a plurality of imaging devices are installed, comprising: an anxiety level calculation unit that calculates an anxiety level indicating a degree of anxiety felt by a person for each small area into which the monitoring area is divided based on environmental factors of the monitoring area; a monitoring level calculation unit that calculates a monitoring level by the imaging device for each of the small areas based on the monitoring ranges and monitoring performances of the plurality of imaging devices; The safety level calculation unit converts the anxiety level for each small area and the monitoring level for each small area into the safety level on a small area basis, thereby calculating the safety level for each small area.

[0007] In addition, the area safety level evaluation program according to an embodiment of the present invention is The computer functions as each unit of the area safety level evaluation device. Effect of the Invention

[0008] According to an area safety level evaluation device and an area safety level evaluation program according to an embodiment of the present invention, an anxiety level calculation unit calculates an anxiety level for each small area based on environmental factors of the monitored area, a monitoring level calculation unit calculates a monitoring level for each small area based on the monitoring ranges and monitoring performances of a plurality of imaging devices, and a safety level calculation unit converts the anxiety level and the monitoring level into a safety level for each small area, thereby calculating a safety level for each small area. As a result, the safety level reflects the anxiety level and the monitoring level for each small area, so that the safety level for each small area can be comprehensively evaluated. [Brief description of the drawings]

[0009] [Figure 1]1 is an overall configuration diagram showing an example of an area safety level assessment system 100 according to an embodiment of the present invention. [Diagram 2] 2 is a data configuration diagram showing an example of a database 30 of the environmental information managing device 3 according to the embodiment of the present invention. FIG. [Diagram 3] 1 is a block diagram showing an example of an area safety level assessment device 1 according to an embodiment of the present invention. [Figure 4] 4 is a functional flow diagram showing an anxiety level calculation process performed by the anxiety level calculation unit 120 according to the embodiment of the present invention. FIG. [Diagram 5] 4 is a functional flow diagram showing a calculation process of a monitoring level by a monitoring level calculation unit 121 according to the embodiment of the present invention. FIG. [Figure 6] 4 is a functional flow diagram showing a safety level calculation process performed by a safety level calculation unit 122 according to the embodiment of the present invention. FIG. [Figure 7] 1 is a diagram showing an example of a display screen 6 based on display information generated by a display information generating process by a display information generating unit 123 according to the embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0011] FIG. 1 is a diagram showing an overall configuration of an example of an area safety level assessment system 100 according to an embodiment of the present invention.

[0012] The area safety level evaluation system 100 comprises an area safety level evaluation device 1 that evaluates the safety level of a monitored area 2 in which a plurality of surveillance cameras 202 are installed, an environmental information management device 3 that acquires and manages environmental information 21 related to environmental elements of the monitored area 2, an administrator terminal 4 used by an administrator of the monitored area 2, and a network 5 that connects the area safety level evaluation device 1, the environmental information management device 3, and the administrator terminal 4 so that they can communicate with each other.

[0013] The monitored area 2 is any area outdoors or indoors. The monitored area 2 may be, for example, an area based on an administrative district such as a city, town, or village, an area within a predetermined radius centered on a landmark such as a station or airport, or the site of a school, factory, commercial facility, public facility, or the like. The monitored area 2 may be, for example, a continuous area such as a contiguous piece of land, or may be a discrete area (for example, the site of school A and the site of school B when school A and school B are not adjacent, or each floor of a multi-story building).

[0014] In this embodiment, the monitored area 2 is a university campus, and the monitored area 2 is described as having multiple facilities 20, such as a building 200, outdoor lights 201, surveillance cameras 202, and an entrance / exit management device 203, as shown in FIG. 1.

[0015] The safety level is an index that indicates the level or degree of safety measures taken to eliminate the sense of anxiety that a person feels that he or she may become a victim of a crime. Therefore, when a surveillance camera 202 as an imaging device is installed in a surveillance area 2, the surveillance level by the surveillance camera 202 is improved within the surveillance range of the surveillance camera 202, and therefore the safety level is expected to improve. On the other hand, the anxiety level indicating the degree of anxiety is affected by environmental factors in the surveillance area 2, so that the anxiety level is not uniform at each position in the surveillance area 2. Therefore, the area safety level evaluation device 1 adopts a method in which the surveillance area 2 is divided into a plurality of small areas M in a mesh shape, for example, and the safety level is evaluated for each small area M by taking into account both the anxiety level and the surveillance level for each small area M. In this embodiment, the small area M is described as being divided into a rectangle, for example, 3 meters square, but the division method, shape, size, etc. when dividing the surveillance area 2 into a plurality of small areas M may be changed as appropriate.

[0016] Environmental factors that affect feelings of anxiety include, for example, spatial attributes such as visibility, light and darkness, and pedestrian traffic (the presence or absence of shadows that obstruct the view, such as buildings, walls, fences, plants, signs, road structures, etc., as well as the amount and range of such shadows), building attributes (size and position of windows, whether it is a residence or a store, age of the building, etc.), road attributes (road width, road type, vehicle traffic volume, presence or absence of on-street parking, etc.), and land attributes (busy district, residential land, farmland, vacant land, etc.).

[0017] The area safety level evaluation device 1 is configured with a general-purpose computer that functions as a server, a cloud, etc. The function of the area safety level evaluation device 1 and the method of evaluating the safety level will be described in detail later.

[0018] The environmental information management device 3 is configured with a general-purpose computer or the like, similar to the area safety level assessment device 1, and includes a database 30 that stores environmental information 21 of the monitored area 2.

[0019] The administrator terminal 4 is composed of, for example, a general-purpose computer installed in the management room where the administrator works, or a portable terminal device such as a tablet or smartphone that the administrator can carry with him / her. The administrator terminal 4 accepts various inputs from the administrator via an input screen, and presents various information to the administrator via a display screen or voice.

[0020] 1, the number of each of the area safety level assessment device 1, the environmental information management device 3, and the administrator terminal 4 is one, but may be more than one. Also, the network 5 may be wired or wireless.

[0021] 2 is a data configuration diagram showing an example of the database 30 of the environmental information management device 3 according to an embodiment of the present invention. The database 30 stores environmental information 21 of the monitored area 2, and the environmental information 21 is added, updated, deleted, etc., by the administrator terminal 4 at any time.

[0022] The environmental information 21 is classified into facility installation information 22 indicating the location, shape, specifications, etc. of the facility 20 and facility acquisition information 23 acquired by the functions of the facility 20.

[0023] The facility installation information 22 includes, for example, building installation information 220, outdoor light installation information 221, surveillance camera installation information 222, entrance / exit management device installation information 223, and the like.

[0024] The building installation information 220 is information including the position, height, shape, etc. of the building 200, and may be, for example, blueprint data of the building 200. The outdoor light installation information 221 is information including the position, height, specifications (luminous flux, light color, orientation angle, etc.) of the outdoor light 201, the time period when the outdoor light 201 is turned on, etc. The surveillance camera installation information 222 is information including the position, height, monitoring range (angle of view, direction), and monitoring performance (resolution, presence or absence of pan function, presence or absence of tilt function, presence or absence of optical zoom, presence or absence of digital zoom, presence or absence of infrared lighting) of the surveillance camera 202. The entrance / exit management device installation information 223 is information including the position, height, and specifications of the gate and door where the entrance / exit management device 203 is installed.

[0025] The facility acquired information 23 includes, for example, surveillance camera acquired information 230, entrance / exit management device acquired information 231, and the like.

[0026] The surveillance camera acquired information 230 is information in which images captured as still images or videos by the surveillance camera 202 are recorded in association with the time and location at which the images were captured. The entrance / exit management device acquired information 231 is information in which entrance / exit detected by the entrance / exit management device 203 is recorded in association with the time and location at which the entrance / exit was detected.

[0027] (Configuration and Operation of Area Safety Level Assessment Device 1) FIG. 3 is a block diagram showing an example of an area safety level assessment device 1 according to an embodiment of the present invention.

[0028] The area safety level evaluation device 1 includes an input unit 10 configured with a keyboard, a touch panel, etc., a storage unit 11 configured with a HDD, a memory, etc., a control unit 12 configured with a processor such as a CPU, a communication unit 13 which is a communication interface with the network 5, and an output unit 14 configured with a display, a speaker, etc. Note that the input unit 10 and the output unit 14 may be omitted. In that case, the administrator terminal 4 may function as the input unit 10 and the output unit 14.

[0029] The storage unit 11 stores an area safety level evaluation program 110 for controlling the operation of the area safety level evaluation device 1 .

[0030] The control unit 12 executes the area safety level evaluation program 110 to function as an anxiety level calculation unit 120, a monitoring level calculation unit 121, a safety level calculation unit 122, and a display information generation unit 123.

[0031] The anxiety level calculation unit 120 calculates the anxiety level for each small area M based on the environmental elements of the monitored area 2. The surveillance level calculation unit 121 calculates the surveillance level by the surveillance cameras 202 for each small area M based on the surveillance range and surveillance performance of the multiple surveillance cameras 202. The safety level calculation unit 122 converts the anxiety level for each small area M and the surveillance level for each small area M into a safety level for each small area M, thereby calculating the safety level for each small area M. The display information generation unit 123 generates display information that switchably superimposes the anxiety level, surveillance level, and safety level on a map representing the monitored area 2.

[0032] The process of calculating the anxiety level for each small region (distribution of anxiety levels), the monitoring level for each small region (distribution of monitoring levels), and the safety level for each small region (distribution of safety levels) will be described below.

[0033] (Anxiety level calculation process) FIG. 4 is a functional flow diagram showing the calculation process of the anxiety level by the anxiety level calculation unit 120 according to the embodiment of the present invention.

[0034] The anxiety level calculation unit 120 acquires the environmental information 21 from the environmental information management device 3 via the network 5, and calculates a distribution Pn of a plurality of environmental index values ​​pn each indicating the degree of influence of a plurality of environmental factors on the anxiety, based on the acquired environmental information 21. When the monitoring area 2 is divided into small areas M in a mesh shape, for example, the environmental index value pn is a parameter calculated for each small area M(xi, yj) (i=i1, i2, ..., I, j=j1, j2, ..., J) using coordinates x and y that identify the small area M as variables.

[0035] In this embodiment, the multiple environmental factors are three (n=3), namely, brightness, visibility, and pedestrian flow, and the multiple environmental index values ​​pn(xi, yj) are three (n=1, 2, 3), namely, horizontal plane illuminance p1(xi, yj), spatial openness p2(xi, yj), and pedestrian flow density p3(xi, yj), as shown in Figure 4.

[0036] The anxiety level calculation unit 120 calculates a distribution P1 of the horizontal plane illuminance p1(xi, yj) based on the position, height, specifications, etc. of the outdoor light 201 by referring to, for example, the outdoor light installation information 221 from among the environmental information 21. For example, during the night when the outdoor light 201 is turned on, the horizontal plane illuminance p1(xi, yj) for a specific small region M(xi, yj) is calculated from the position, height, and luminous flux of the outdoor light 201. During the daytime when the outdoor light 201 is not turned on, the horizontal plane illuminance p1(xi, yj) may be a constant value, or may be calculated based on, for example, the amount of solar radiation (taking into account, for example, the weather, the direction and height of the sun), the position of the shade by a building, etc.

[0037] The anxiety level calculation unit 120 calculates the distribution P2 of the spatial openness p2(xi, yj) based on the position, height, shape, etc. of the building 200 by referring to, for example, the building installation information 220 from the environmental information 21. For example, the spatial openness p2(xi, yj) for a specific small area M(xi, yj) is calculated as the average value of the values ​​L / H (where the upper limit is 6) obtained by dividing the distance L from the small area M to the wall surface of the building 200 by the height H of the building 200 for each predetermined angle (for example, 5 degrees) centered on the small area M, around the small area M.

[0038] The anxiety level calculation unit 120 calculates the distribution P3 of the pedestrian flow density p3(xi, yj) based on the image taken by the surveillance camera 202 and the entry / exit record detected by the entry / exit management device 203 by referring to, for example, the surveillance camera acquisition information 230 and the entrance / exit management device acquisition information 231 of the environmental information 21. For example, the pedestrian flow density p3(xi, yj) for a specific small area M(xi, yj) is calculated as the traffic volume per unit time in the small area M by analyzing the image taken by the surveillance camera 202 in the small area M and acquiring the number of passersby, the direction of travel, the route of travel, etc. Note that the pedestrian flow density p3(xi, yj) may be calculated by further taking into account the entrance / exit management device acquisition information 231, or may be calculated by referring to the history of the same time period or day of the week in the past.

[0039] The anxiety level calculation unit 120 converts the distribution Pn (P1 to P3) of the multiple environmental index values ​​pn (p1 to p3) calculated as described above into a distribution Qn (Q1 to Q3) of multiple environmental index levels qn (q1 to q3) by expressing the multiple environmental index values ​​pn (p1 to p3) calculated as described above as a graded evaluation (for example, 9 levels from 1 to 9) for each environmental factor.

[0040] For horizontal plane illuminance p1, the possible range of horizontal plane illuminance p1 is classified into 9 levels (1 (bright) to 9 (dark)) and converted into distribution Q1 of horizontal plane illuminance level q1. For spatial openness p2, the possible range of spatial openness p2 is classified into 9 levels (1 (good visibility) to 9 (poor visibility)) and converted into distribution Q2 of spatial openness level q2. For pedestrian flow density p3, the possible range of pedestrian flow density p3 is classified into 9 levels (1 (heavy foot traffic) to 9 (low foot traffic)) and converted into distribution Q3 of pedestrian flow density level q3.

[0041] The anxiety level calculation unit 120 then calculates a distribution R of anxiety levels r(xi, yj) indicating anxiety by combining the distributions Qn(Q1-Q3) of a plurality of environmental index levels qn(q1-q3). The anxiety level r(xi, yj) is a numerical value or level (stepwise numerical value) of anxiety, and in this embodiment, the higher the numerical value of the anxiety level r(xi, yj), the greater the anxiety is considered to be.

[0042] Specifically, the anxiety level calculation unit 120 calculates the distribution R of the anxiety level r(xi, yj) by integrating the multiple environmental index levels qn(q1-q3) by multiple correction coefficients an(a1-a3) set for each environmental factor, summing them up for each small region M(xi, yj), and further adding the correction value b. That is, the anxiety level r(xi, yj) for a specific small region M(xi, yj) is calculated by the following formula (1) using the correction coefficients an(a1-a3) and the correction value b.

[0043]

number

[0044] In the above example, the environmental factors have been described as being three: brightness, visibility, and pedestrian traffic (horizontal plane illuminance p1, spatial openness p2, and pedestrian flow density p3). However, the environmental factors are not limited to three, and may be one, two, or four or more, and may include other environmental factors (other environmental index values) other than brightness, visibility, and pedestrian traffic (horizontal plane illuminance p1, spatial openness p2, and pedestrian flow density p3).

[0045] (Monitoring level calculation process) FIG. 5 is a functional flow diagram showing a calculation process of the monitoring level by the monitoring level calculation unit 121 according to the embodiment of the present invention.

[0046] The surveillance level calculation unit 121 acquires the surveillance camera installation information 222 from the environmental information management device 3 via the network 5, and calculates a distribution D of the surveillance levels d(xi, yj) based on the surveillance range and surveillance performance of the multiple surveillance cameras 202 included in the acquired surveillance camera installation information 222. The surveillance range is determined by the angle of view and direction of the surveillance camera 202, and may be determined taking into account panning and tilting functions if the surveillance camera has them. The surveillance performance is determined according to the resolution represented by the number of pixels per unit length, and may be determined taking into account digital zoom, optical zoom, and infrared lighting if the surveillance camera has them.

[0047] The surveillance level calculation unit 121, for example, specifies the resolution px(xi, yj) of the surveillance camera 202 for each small region M(xi, yj), and calculates the surveillance level d(xi, yj) to be higher as the resolution px(xi, yj) becomes higher within the surveillance range, thereby calculating the distribution D of the surveillance level d(xi, yj). Specifically, the surveillance level d(xi, yj) for a specific small region M(xi, yj) is calculated by the following formula (2) using the resolution px(xi, yj) expressed by the number of pixels per 20 cm (unit length) in the small region M(xi, yj).

[0048]

number

[0049] The relationship between the resolution px and the monitoring level d expressed by the above formula (2) may be stored in the storage unit 11 as resolution-monitoring level relationship information as shown in FIG. 5, and may be changeable via the administrator terminal 4. In the above formula (2), the monitoring level d(xi, yj) is set to "1" when the number of pixels per 20 cm (unit length) is 80 or more. This is determined as the resolution px required to identify the face of a person when the person is photographed by the monitoring camera 202, and may be changed as appropriate depending on the position of the outdoor light 201, the presence or absence of infrared lighting, etc. In addition, the function expressed by the above formula (2) is expressed as a curve shown in FIG. 5, but the function of formula (2) may be changed as appropriate.

[0050] (Safety level calculation process) FIG. 6 is a functional flow diagram showing a safety level calculation process by the safety level calculation unit 122 according to the embodiment of the present invention.

[0051] The safety level calculation unit 122 converts the distribution R of the anxiety levels r(xi, yj) calculated by the anxiety level calculation unit 120 and the distribution D of the monitoring levels d(xi, yj) calculated by the monitoring level calculation unit 121 into safety levels s(xi, yj) in units of small regions M(xi, yj), thereby calculating the distribution S of the safety levels s(xi, yj).

[0052] The safety level calculation unit 122 calculates the safety level s(xi,yj) by substituting the anxiety level r(xi,yj) and the monitoring level d(xi,yj) as variables into a conversion formula or conversion map that outputs the safety level s(xi,yj). Specifically, the safety level s(xi,yj) for a specific small area M(xi,yj) is calculated by the conversion formula expressed by the following formula (3) using the anxiety level r(xi,yj) and the monitoring level d(xi,yj) normalized to the range of 0 to 1 as variables.

[0053]

number

[0054] The safety levels s(xi, yj) are classified into four safety levels s(xi, yj) corresponding to the four zones 1 to 4, respectively, as shown in FIG. 6, based on the safety level classification condition shown in the following formula (4).

[0055]

number

[0056] The safety level s(xi,yj) of Zone 4 indicates that the anxiety level r(xi,yj) falls within a small region M(xi,yj) below a predetermined anxiety threshold (=0.75), and some kind of safety measure is necessary.

[0057] The safety level s(xi,yj) of Zone 3 corresponds to a small area M(xi,yj) where the anxiety level r(xi,yj) is slightly below the anxiety threshold and the monitoring level d(xi,yj) is low, indicating that it is not sufficiently safe.

[0058] The safety level s(xi,yj) of Zone 2 corresponds to a small area M(xi,yj) where the anxiety level r(xi,yj) is low but the monitoring level d(xi,yj) is low, or where the anxiety level r(xi,yj) is high but the monitoring level d(xi,yj) is high, or where the anxiety level r(xi,yj) is high and the monitoring level d(xi,yj) is low, and represents an improvement over Zone 3 and sufficient safety.

[0059] The safety level s(xi,yj) of Zone 1 corresponds to the small area M(xi,yj) where the anxiety level r(xi,yj) is low and the monitoring level d(xi,yj) is high, and represents the safest area.

[0060] The conversion formula (e.g., formula (3)) and the conversion map (e.g., formula (4) and FIG. 6) used by the safety level calculation unit 122 may be stored in the storage unit 11, and may be changeable via the administrator terminal 4. The conversion formula (e.g., formula (3)) may be any formula that calculates the safety level s using the anxiety level r and the monitoring level d as variables such that the lower the anxiety level r or the higher the monitoring level d, the higher the safety level s, and is not limited to the example of formula (3) above, and may be changed as appropriate. Furthermore, the conversion map (e.g., see formula (4) and FIG. 6) classifies (converts) the safety level s into four stages using the anxiety level r and the monitoring level d as variables, but is not limited to the example of formula (4) and FIG. 6 above, and the classification method and number of classifications of the safety level s may be changed as appropriate. In addition, the safety level calculation unit 122 may calculate the distribution S of the safety level s that can take on continuous values ​​using a conversion formula without using a conversion map, or may calculate the distribution S of the safety level s that can take on stepped values ​​using a conversion map without using a conversion formula.

[0061] When the display information generating unit 123 receives a display information generating request from the administrator terminal 4, it generates various display information in response to the request and transmits it to the administrator terminal 4 via the communication unit 13. Based on the display information, the administrator terminal 4 displays a display screen (see FIG. 7 described later) via a browser, an application, or the like. Note that the administrator terminal 4 may print out the display information or save it as data.

[0062] FIG. 7 is a diagram showing an example of a display screen 6 based on display information generated by the display information generating unit 123 according to the embodiment of the present invention through a display information generating process.

[0063] The display screen 6 comprises a level selection section 60 located at the upper left of the screen, a surveillance camera editing section 61 located at the lower left of the screen, and a data display section 62 located at the right of the screen for displaying various data superimposed on a plan view (map) showing the surveillance area 2. The arrangement and size of each section 60 to 62 may be changed as appropriate.

[0064] The level selection unit 60 is configured to allow the element to be displayed to be selected from a plurality of options, for example, by radio buttons. As the plurality of options, a distribution R of anxiety level r, a distribution D of surveillance level d, and a distribution S of safety level s are configured to be selectable. The level selection unit 60 may be further configured to allow the distribution P1 of horizontal plane illuminance p1, the distribution P2 of spatial openness p2, the distribution P3 of pedestrian flow density p3, and the distribution Qn (Q1 to Q3) of environmental index level qn (q1 to q3) to be selectable.

[0065] The surveillance camera editing unit 61 is configured to be able to accept operations such as changing the surveillance camera installation information 222 (e.g., position, surveillance range) of the existing surveillance cameras 202 installed in the surveillance area 2, and adding a newly installed surveillance camera 202 to the surveillance area 2 displayed on the data display unit 62. When the surveillance camera editing unit 61 accepts an operation of change or addition, the surveillance level calculation unit 121 and the safety level calculation unit 122 may recalculate the distribution D of the surveillance levels d and the distribution S of the safety levels s based on the surveillance camera installation information 222 of the surveillance cameras 202 corresponding to the operation.

[0066] The data display unit 62 is configured to switchably superimpose and display data corresponding to the element to be displayed selected by the level selection unit 60, i.e., the distribution R of anxiety levels r, the distribution D of monitoring levels d, and the distribution S of safety levels s, on a plan view showing the monitoring area 2. The data display unit 62 is also configured to update the screen display when the distribution D of monitoring levels d and the distribution S of safety levels s are recalculated by the monitoring level calculation unit 121 and the safety level calculation unit 122 in response to an operation received by the monitoring camera editing unit 61.

[0067] 6, a distribution S of safety levels s is superimposed and the darker the color of the small region M, the higher the anxiety level r (the greater the anxiety). Note that the data display unit 62 may display various statistical values ​​such as average values, maximum values, minimum values, etc., in addition to the data.

[0068] The data display unit 62 is configured to be able to change the display range and scale of the monitored area 2. The distribution S of the safety level s displayed on the data display unit 62 may be displayed in either a gray scale or a color scale, or may be displayed as a contour diagram (isopleth diagram).

[0069] The administrator can check the status of the monitored area 2 by operating the level selection unit 60 and visually checking the data display unit 62 on the display screen 6 displayed on the administrator terminal 4. Furthermore, when considering changing the existing surveillance cameras 202 or adding new surveillance cameras 202, the administrator can operate the surveillance camera editing unit 61 on the display screen 6 to compare the distribution S of the safety level s as the status of the monitored area 2 before and after the operation, thereby checking in advance the effect of changing or adding the surveillance cameras 202 (change in the safety level s).

[0070] (Other embodiments) The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the technical spirit of the present invention.

[0071] In the above embodiment, when the anxiety level calculation unit 120, the monitoring level calculation unit 121, and the safety level calculation unit 122 calculate the anxiety level r for each small area M, the monitoring level d for each small area M, and the safety level s for each small area M, the concept of time may be introduced to calculate the anxiety level r for each small area M, the monitoring level d for each small area M, and the safety level s for each small area M as time-series data. This makes it possible to calculate each level by time period, such as daytime and nighttime.

[0072] In the above embodiment, when the anxiety level calculation unit 120, the monitoring level calculation unit 121, and the safety level calculation unit 122 calculate the anxiety level r for each small area M, the monitoring level d for each small area M, and the safety level s for each small area M, the concept of height (Z axis) may be introduced to calculate the anxiety level r for each small area M, the monitoring level d for each small area M, and the safety level s for each small area M as data by height. This makes it possible to calculate each level by floor or by hierarchy, such as an underground passage and an above-ground passage.

[0073] In the above embodiment, the area safety level assessment device 1 and the environment information management device 3 are described as separate devices, but they may be configured as one device. Also, the area safety level assessment device 1 may be configured as multiple devices.

[0074] In the above embodiment, the area safety level evaluation program 110 has been described as being stored in the storage unit 11, but it may be provided by being recorded in a computer-readable recording medium such as a CD-ROM or DVD as a file in an installable or executable format. The area safety level evaluation program 110 may be provided by being stored on a computer connected to a network such as the Internet and downloaded via the network.

[0075] As described above, according to the area safety level evaluation device 1 according to the embodiment, the anxiety level calculation unit 120 calculates the anxiety level r for each small area M based on the environmental factors of the monitored area 2, the monitoring level calculation unit 121 calculates the monitoring level d for each small area M based on the monitoring range and monitoring performance of the multiple monitoring cameras 202, and the safety level calculation unit 122 converts the anxiety level r and the monitoring level d into a safety level s for each small area M, thereby calculating the safety level s for each small area M. As a result, the safety level s for each small area M is evaluated comprehensively by reflecting the anxiety level r and the monitoring level d for each small area M, so that, for example, by installing the monitoring camera 202 in a small area M with a low safety level s, the manager of the monitored area 2 can check the distribution of the safety level s in the entire monitored area 2. [Explanation of symbols]

[0076] 1...area safety level assessment device, 2...monitoring area, 3...environmental information management device, 4...Administrator terminal, 5...Network, 6...Display screen, 10...input unit, 11...storage unit, 12...control unit, 13...communication unit, 14...output unit, 20...Facilities, 21...Environmental information, 22...Facility installation information, 23...Facility acquisition information, 30…database, 60: level selection unit, 61: surveillance camera editing unit, 62: data display unit, 100...Area safety level evaluation system, 110...Area safety level evaluation program, 120: Anxiety level calculation unit, 121: Monitoring level calculation unit, 122: safety level calculation unit; 123: display information generation unit; 200...building, 201...street light, 202...surveillance camera (imaging device), 203: Entrance / exit management device, 220: building installation information, 221: outdoor light installation information, 222... Surveillance camera installation information, 223... Entrance and exit management device installation information, 230... Surveillance camera acquired information, 231... Entrance / exit management device acquired information

Claims

1. An area safety level evaluation device for evaluating a safety level of a monitoring area in which a plurality of imaging devices are installed, comprising: an anxiety level calculation unit that calculates an anxiety level indicating a degree of anxiety felt by a person for each small area into which the monitoring area is divided based on environmental factors of the monitoring area; a monitoring level calculation unit that calculates a monitoring level by the imaging device for each of the small areas based on the monitoring ranges and monitoring performances of the plurality of imaging devices; a safety level calculation unit that converts the anxiety level for each of the small regions and the monitoring level for each of the small regions into a safety level on a small region basis, The anxiety level calculation unit calculating the anxiety level for each of the small regions based on one or more environmental index values ​​indicating the degree of influence of one or more environmental factors on the anxiety as the environmental elements; The environmental factors include: The attribute of a space, a building, a road, or a land. Area safety level assessment device.

2. An area safety level evaluation device for evaluating a safety level of a monitoring area in which a plurality of imaging devices are installed, comprising: an anxiety level calculation unit that calculates an anxiety level indicating a degree of anxiety felt by a person for each small area into which the monitoring area is divided based on environmental factors of the monitoring area; a monitoring level calculation unit that calculates a monitoring level by the imaging device for each of the small areas based on the monitoring ranges and monitoring performances of the plurality of imaging devices; a safety level calculation unit that converts the anxiety level for each of the small regions and the monitoring level for each of the small regions into a safety level on a small region basis, The anxiety level calculation unit calculating the anxiety level for each of the small regions by synthesizing a distribution of a plurality of environmental index values ​​each indicating a degree of influence of a plurality of environmental factors on the anxiety as the environmental elements; Area safety level assessment device.

3. The safety level calculation unit Calculating the safety level for each of the small regions by substituting the anxiety level and the monitoring level as variables into a conversion formula or a conversion map that outputs the safety level.

3. The area safety level evaluation device according to claim 1 or 2.

4. The monitoring level calculation unit As the monitoring performance, a resolution expressed by the number of pixels per unit length is specified for each small region, and the monitoring level is calculated to be higher as the resolution becomes higher within the monitoring range. The area safety level assessment device according to any one of claims 1 to 3.

5. a display information generating unit that generates display information that switchably superimposes the anxiety level, the monitoring level, and the safety level on a map representing the monitoring area, The area safety level assessment device according to any one of claims 1 to 4.

6. A method for making a computer function as each unit of the area safety level assessment device according to any one of claims 1 to 5, Area Safety Level Assessment Program.

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