JP2020160662A - Installation support apparatus and installation support program - Google Patents

Abstract

To determine an installation candidate space of a camera suitable for photographing a monitoring object surface at a proper angle.SOLUTION: An installation support apparatus 10 includes: a selection receiving section 22 which receives selection of a monitoring object surface 32 to be a monitoring object of a plurality of surfaces for forming a three-dimensional model of a monitoring object 30; a reference straight line setting section 23 which sets a reference straight line 33 extending in a recommended monitoring direction set to the monitoring object surface 32 from a monitoring point 37 on the selected monitoring object surface 32; and an installation candidate space calculation section 24 which calculates a conical space 34 formed by a half straight line forming an acute angle of an allowable angle θ or less with the reference straight line 33 by defining the monitoring point 37 as one end as an installation candidate space of a camera for photographing the monitoring object surface 32.SELECTED DRAWING: Figure 2

Description

The present invention relates to an installation support device and an installation support program.

When installing a surveillance camera, the placement conditions (installation position, posture, angle of view) of the surveillance camera to achieve the desired surveillance purpose are planned (planned) in advance. For example, if it is necessary to photograph the surveillance space without blind spots in order to achieve the surveillance purpose, the arrangement conditions of the surveillance cameras are determined so that the blind spots do not occur. Since the placement conditions are generally diverse, manual planning requires a great deal of labor and depends on the subjectivity and experience of the planner.

Therefore, the applicant finds the space range in which the camera can take a picture based on the placement condition, finds the evaluation value that becomes higher as the blind spot in the monitoring space decreases, and changes the placement condition to obtain the highest evaluation value. By searching for, we proposed a technique to easily obtain an arrangement condition with few blind spots without depending on the experience of the planner (Patent Document 1 below).

Japanese Unexamined Patent Publication No. 2018-128961

However, in the invention of Patent Document 1, there are cases where it is not possible to make a plan that can reliably photograph a specific monitoring target. In particular, under the arrangement conditions obtained in the invention of Patent Document 1, it is not always possible to photograph a specific surface to be monitored (monitored surface) from an appropriate angle.
The present invention has been made in view of the above problems, and an object of the present invention is to obtain a camera installation candidate space suitable for photographing a monitored surface at an appropriate angle.

The installation support device according to one embodiment of the present invention has a selection reception unit that accepts selection of a monitoring target surface to be monitored from a plurality of surfaces forming a three-dimensional model of a monitoring object, and a selection reception unit on the selected monitoring target surface. It is formed by a reference straight line setting unit that sets a reference straight line extending from the monitoring point to the recommended monitoring direction set on the monitoring target surface, and a half-line locus that has a monitoring point as one end and forms a sharp angle equal to or less than the allowable angle. It is provided with an installation candidate space calculation unit that calculates the cone-shaped space as an installation candidate space for a camera that photographs the surface to be monitored.

The selection reception unit may accept the selection of a plurality of monitored surfaces. The installation candidate space calculation unit may calculate as the installation candidate space a space in which the cone-shaped spaces calculated for the reference straight lines of the plurality of monitored surfaces overlap each other.
The selection reception unit may accept the selection of a plurality of monitored surfaces. The installation candidate space calculation unit calculates the integrated recommended monitoring direction that integrates the recommended monitoring directions set for each of the multiple monitoring target surfaces, and calculates each reference straight line extending from each of the multiple monitoring target surfaces in the integrated recommended monitoring direction. A space in which the formed cone-shaped spaces overlap may be calculated as an installation candidate space.

The installation candidate space calculation unit may calculate the installation candidate space by using the structure information indicating the position and shape of the structure around the monitored object and the conical space.
The installation support device may further include a mounting candidate area calculation unit that calculates a camera mounting candidate area using the structure information indicating the position and shape of the structure around the monitored object and the installation candidate space. ..
The recommended monitoring direction may be the normal of the surface to be monitored.
At least one of the recommended monitoring direction and the allowable angle may be specified by at least one of the material of the surface to be monitored and the position of the light source in the monitoring space.

The installation support program according to another embodiment of the present invention includes a selection reception step for accepting the selection of the monitored surface to be monitored from the plurality of surfaces forming the three-dimensional model of the monitored object, and the selected monitoring. A reference straight line setting step for setting a reference straight line extending from a monitoring point on the target surface to the recommended monitoring direction set on the monitoring target surface, and a trajectory of a half straight line forming a sharp angle less than the allowable angle with the reference straight line with the monitoring point as one end. The installation candidate space calculation step of calculating the conical space formed by the above as the installation candidate space of the camera for photographing the monitored surface is executed.

According to the present invention, it is possible to obtain a camera installation candidate space suitable for photographing the monitored surface at an appropriate angle.

It is a schematic block diagram of an example of the installation support device of the embodiment of this invention. It is explanatory drawing of an example of the installation support method by embodiment of this invention. It is explanatory drawing of the setting example of a reference straight line. (A) to (c) are explanatory views of other setting examples of a reference straight line. (A) and (b) are explanatory views of other setting examples of permissible angles. It is explanatory drawing of an example of the calculation method of the installation candidate space and the installation candidate area of a camera. It is a flowchart of an example of the installation support method by 1st Embodiment of this invention. It is explanatory drawing of an example of the calculation method of the installation candidate space in 2nd Embodiment. (A) to (c) are explanatory views of an example of the calculation method of the installation candidate space in the 3rd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the embodiments of the present invention shown below exemplify devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention includes the structure, arrangement, etc. of components. Is not specified as the following. The technical idea of the present invention may be modified in various ways within the technical scope specified by the claims stated in the claims.

(First Embodiment)
(Constitution)
See FIG. The installation support device 10 of the embodiment is composed of, for example, a computer, and includes a storage unit 11 and a control unit 12.
The storage unit 11 may include any of a semiconductor storage device, a magnetic storage device, and an optical storage device. The storage unit 11 may include a memory such as a register, a cache memory, a ROM (Read Only Memory) and a RAM (Random Access Memory) used as a main storage device.

The control unit 12 is composed of, for example, a processor such as a CPU (Central Processing Unit) or an MPU (Micro-Processing Unit), and peripheral circuits thereof.
The function of the control unit 12 described below is realized, for example, by executing the installation support program 20, which is a computer program stored in the storage unit 11, by the processor included in the control unit 12.

The input device 13 is a mouse operated by a camera planning implementer, a monitoring worker, an administrator, or the like (hereinafter, referred to as “planning implementer, etc.”) in order to control the operation of the installation support device 10. And keyboards. The input device 13 is connected to the installation support device 10, and various information is input to the installation support device 10 from the input device 13. Further, the output device 14 is a display, a projector, a printer, or the like that outputs visual information of a camera installation candidate space or a mounting candidate area calculated by the installation support device 10.

The installation support device 10 calculates an installation candidate space and an installation candidate area of a camera capable of photographing a specific monitoring object. The installation candidate space is a three-dimensional spatial range of the viewpoint (optical center) of the camera capable of photographing the monitored object. Further, the mounting candidate region is a two-dimensional region representing a mounting position when a camera capable of photographing the monitored object is mounted on the surface of a structure around the monitored object.
See FIG. Now, it is assumed that the monitored object 30 exists in the monitoring space 31 which is an outdoor space, an indoor space formed by a structure, or the like.
When a camera for photographing the monitored object 30 is installed, it may be difficult to see the surface to be monitored even if the monitored object 30 can be photographed. For example, if the surface to be monitored and the line of sight are almost parallel, the contents of the surface cannot be monitored.

Therefore, the installation support device 10 accepts the selection of the monitored surface 32 to be monitored from the plurality of surfaces forming the three-dimensional model of the monitored object 30.
Then, the installation support device 10 sets a reference straight line 33 extending from the monitoring point 37 on the selected monitoring target surface 32 in the recommended monitoring direction set on the monitoring target surface 32.

The installation support device 10 photographs the surface to be monitored in the conical space 34 including the reference straight line 33 among the spaces surrounded by the locus of the semi-straight line forming the acute angle of the reference straight line 33 and the allowable angle θ with the monitoring point 37 as one end. Calculated as a candidate space for installing a camera.
The installation support device 10 calculates the area 36 in contact with the installation candidate space 34 on the surface of the structure (for example, the ceiling 35) around the monitored object as the camera mounting candidate area.
As a result, the installation support device 10 can calculate the installation candidate space and the installation candidate area of the camera suitable for photographing the monitored surface 32 at an appropriate angle.

The details of the installation support device 10 will be described below. See FIG. In addition to the above-mentioned installation support program 20, the storage unit 11 stores the structure information 21.
The structure information 21 is three-dimensional geometric shape data (that is, three-dimensional) representing the position, shape, structure, and the like of an object such as a real-world structure, the ground, and obstacles (furniture, trees, etc.) existing in the monitoring space 31. Model). In the example of FIG. 2, the structure information 21 may include the geometric shape data of the monitored object 30 which is an object in the monitoring space 31 and the ceiling 35 which is a structure.

The geometric shape data for generating the structure information 21 may be created by 3D CAD or BIM (Building Information Modeling), or a 3D shape of an object existing in the monitoring space by a 3D laser scanner or the like. The captured data may be used. The geometric shape data for generating the structure information 21 may be data representing a three-dimensional shape including height information created by performing stereo imaging or laser ranging from an aircraft by polygon data.

Further, the structure information 21 may include material information of the structure, the ground, and an object existing in the monitoring space 31, and information on the position and irradiation direction of the light source in the monitoring space 31. Further, the structure information 21 may include attribute data such as the above-mentioned recommended monitoring direction and allowable angle θ for the structure, the ground, and the object existing in the monitoring space 31.
Such structure information 21 is stored in the storage unit 11 by being set and registered from the input device 13 by a planner or the like.

The control unit 12 reads and executes the installation support program 20 stored in the storage unit 11, and functions as a selection reception unit 22, a reference straight line setting unit 23, an installation candidate space calculation unit 24, and an installation candidate area calculation unit 25. ..
The selection reception unit 22 receives the selection of the monitoring target surface 32 to be monitored from among the plurality of surfaces forming the three-dimensional model of the monitoring object 30. The planner selects the monitored surface 32 by using the input device 13.

For example, the planner may select a predetermined surface (for example, a predetermined polygon) of the three-dimensional model of the monitored object 30 included in the structure information 21 as the monitored object surface 32.
A surface other than the data included in the structure information 21 may be selected. For example, the planner assumes a passerby as a monitoring target, adds three-dimensional data (for example, a polygon) simulating the body surface of the passerby using the input device 13, and selects this as the monitoring target surface. You may.

The reference straight line setting unit 23 sets the reference straight line 33 as the direction in which the monitored surface 32 should be monitored.
For example, attribute data of the recommended monitoring direction may be added to each of the surfaces constituting the three-dimensional model of the monitored object, and a reference straight line extending in the recommended monitoring direction of the selected monitored object surface 32 may be set. Further, the planner may input the recommended monitoring direction using the input device 13 and set a reference straight line extending in the recommended monitoring direction. The recommended monitoring direction is the direction toward the outside of the monitored object.
See FIG. When monitoring is possible from a plurality of directions, a plurality of reference lines 33a to 33c may be set for a single monitored surface 32. In this case, the sum of the cone-shaped spaces 34a to 34c calculated for the reference straight lines 33a to 33c is the installation candidate space.

Further, the recommended monitoring direction may be set by at least one of the material of the monitoring target surface 32 and the position of the light source in the monitoring space 31.
See (a) in FIG. For example, the recommended monitoring direction may be set according to the material of the surface to be monitored 32. For example, some cameras 40 include a light source 41. The broken line 42 indicates a light beam from the light source 41.
When the material of the monitoring target surface 32 easily reflects light (for example, when the mirror surface reflectance is high), the reflected light of the monitoring target surface 32 may enter the optical system of the camera 40, making it difficult to see the monitoring target surface 32. .. Therefore, in such a case, for example, the recommended monitoring direction is set so that the angle formed by the monitoring target surface 32 with the normal direction n is larger than the angle threshold value φ1 (> φ).

See (b) in FIG. For example, when the light source 43 exists near the monitored surface 32 and the material of the monitored surface 32 easily reflects light, the same problem may occur.
In this case, for example, the recommended monitoring direction may be set so that the angle formed by the light beam of the light source 43 incident from the incident direction 44 with the specular reflection direction 45 is larger than the angle threshold value φ1.

See (c) of FIG. For example, the same problem may occur when the direction of the light source 43 existing near the surface to be monitored 32 is close to the direction of monitoring.
In this case, for example, the recommended monitoring direction may be set so that the angle formed by the light beam from the light source 43 with the incident direction 44 is larger than the angle threshold value φ1.

Next, the reference straight line setting unit 23 sets an allowable angle θ that determines how much the direction in which the monitored surface 32 is photographed is from the reference straight line 33.
For example, if the attribute data of the permissible angle θ (0 ° ≧ θ> 90 °) is added to the structure information 21 of the monitored surface 32, the permissible angle θ may be set according to this attribute data. Further, if the planner inputs using the input device 13, the permissible angle θ may be set according to this input.

Further, the permissible angle θ may be set by at least one of the material of the monitoring target surface 32 and the position of the light source in the monitoring space 31.
For example, when the surface to be monitored 32 is a liquid crystal screen in a liquid crystal display, the material (or the viewing angle itself) that defines the viewing angle of the liquid crystal screen is stored as attribute data, and the viewing angle is based on the attribute data. The permissible angle is set so that the line of sight of the camera 40 is included in the inside. As a result, the display on the liquid crystal screen can be properly confirmed.

Further, when there is a light source 43 that interferes with shooting near the monitoring target surface 32 and the material of the monitoring target surface 32 easily reflects light, for example, the light beam from the light source 43 is positive on the monitoring target surface 32. Set a small allowable angle so that the recommended monitoring direction is not set in the reflection direction. Further, the allowable angle may be set as small as possible so that the light rays do not enter the field of view of the camera 40 as much as possible.

Further, for example, when a warning lamp indicating a fire or an intrusion abnormality is used as a light source 43 and a warning lamp is photographed through a monitoring target surface 32 that mirror-reflects a light ray from the light source 43 to detect an abnormality, the reflecting surface of the light source 43 is used. In consideration of the material of the monitoring target surface 32 and the position of the light source 43, the recommended monitoring direction may be set so as to be the specular reflection direction of the light beam from the light source 43, and the allowable angle may be set to be small.

Further, the permissible angle does not have to be always constant with respect to a single reference line 33. See (a) in FIG. 5 and (b) in FIG. For example, the permissible angle may vary between the maximum value θ1 and the minimum value θ2.
For example, the coordinate system of the left-handed system or the right-handed system with the reference straight line 33 as the Z axis is defined, the azimuth angle around the reference straight line 33 is defined by the angle ψ counterclockwise from the X axis, and each allowable angle ψ is defined. The magnitude of the angle θ may be set. The permissible angle θ at each azimuth angle ψ may be set based on, for example, attribute data such as the material of the surface to be monitored 32 or structure information 21 such as a light source, and is set by the planner using the input device 13. You may.

Further, the reference straight line setting unit 23 sets a monitoring point 37 which is a passing point of the reference straight line 33 on the monitoring target surface 32. For example, the installation candidate space calculation unit 24 may set the center of gravity or the center of the monitored surface 32 as the monitoring point 37. The planner may set the monitoring point 37 using the input device 13.

See FIG. When the reference straight line 33, the allowable angle θ, and the monitoring point 37 are set, the installation candidate space calculation unit 24 extends the reference straight line 33 from the monitoring point 37 in the recommended monitoring direction, and regards the reference straight line 33 as the rotation axis of the cone. To calculate the cone. For example, the installation candidate space calculation unit 24 calculates a cone having an apex angle twice the allowable angle θ. Then, the calculated cone is defined as the cone-shaped space 34.

That is, the installation candidate space calculation unit 24 calculates the cone-shaped space 34 formed by the reference straight line 33 extending in the recommended monitoring direction with the monitoring point 37 as one end and the locus of an acute angle formed by an acute angle θ or less. The recommended monitoring direction is a direction toward the outside of the object to be monitored, and the weight-shaped space 34 is a space including a reference straight line.
As described above, the permissible angle θ does not have to be always constant with respect to a single reference straight line 33, and in this case, the calculated cone does not have to be a cone.

The installation candidate space calculation unit 24 calculates the installation candidate space based on the calculated cone-shaped space 34 and the position and shape of the structure included in the structure information 21.
Specifically, of the calculated pyramidal space 34, a subspace that does not overlap with the space occupied by the structure included in the structure information 21 is set as the installation candidate space. At this time, the cone-shaped space 34 is regarded as the space generated by the spotlight light source, and the space behind the structure is excluded from the installation candidate space. That is, the space that becomes the blind spot of the structure when viewed from the monitoring point 37 is excluded from the installation candidate space.

See FIG. Of the cone-shaped space 34, the space 61 with diagonal line hatching is a space occupied by the structure 60, and the space 63 with horizontal line hatching is a space behind the structure 60. Therefore, the installation candidate space calculation unit 24 calculates the space 62 (the space 62 with the grain hatching) excluding the space 61 and the space 63 from the cone-shaped space 34 as the installation candidate space.

See FIG. The mounting candidate area calculation unit 25 calculates the mounting candidate area of the camera by using the structure information 21 and the installation candidate space. For example, the mounting candidate area calculation unit 25 calculates the area in contact with the installation candidate space on the surface of the structure around the monitored object 30 as the camera mounting candidate area.
See FIG. The installation candidate space 62 is in contact with the surface areas 64a and 64b of the structures 35 and 60 around the monitored object 30. The mounting candidate area calculation unit 25 calculates these areas 64a and 64b as mounting candidate areas for the camera.

(motion)
Hereinafter, an example of the installation support method of the embodiment will be described with reference to FIG. 7.
In step S1, prior to designing the camera installation position, the structure information 21 such as the structure, the ground, and the object existing in the monitoring space 31 is acquired or generated, and set and registered in the storage unit 11 of the installation support device 10. To do.
In step S2, when the planner selects the monitored object surface 32 of the monitored object 30 using the input device 13, the selection receiving unit 22 accepts the selection of the monitored object surface 32.

In step S3, the reference straight line setting unit 23 sets the reference straight line 33 indicating the direction in which the monitored surface 32 is monitored.
In step S4, the reference straight line setting unit 23 sets an allowable angle θ that determines how much the direction in which the monitored surface 32 is photographed is from the reference straight line 33.
In step S5, the installation candidate space calculation unit 24 calculates a cone-shaped space 34 including the reference straight line 33 among the spaces surrounded by the loci of the half straight line forming the allowable angle θ with the reference straight line 33 with the monitoring point 37 as one end.

In step S6, the installation candidate space calculation unit 24 sets the space occupied by the structure included in the structure information 21 and the space behind the structure from the calculated cone-shaped space 34 as the installation candidate space. Calculate as.
In step S7, the mounting candidate area calculation unit 25 calculates the area of the surface of the structure around the monitored object 30 that is in contact with the installation candidate space as the camera mounting candidate area.
After that, the process ends.

(Effect of the first embodiment)
(1) The selection receiving unit 22 receives the selection of the monitored surface to be monitored from the plurality of surfaces forming the three-dimensional model of the monitored object 30. The reference straight line setting unit 23 sets a reference straight line extending from the monitoring point on the selected monitoring target surface in the recommended monitoring direction set on the monitoring target surface. The installation candidate space calculation unit 24 uses a monitoring point as one end, and a cone-shaped space formed by a locus of a half straight line forming a sharp angle equal to or less than the allowable angle with the reference straight line (using the allowable angle set to the sharp angle, and using the monitoring point as one end). Of the space surrounded by the locus of the half straight line forming the allowable angle with the reference straight line, the weight-shaped space including the reference straight line) is calculated as the installation candidate space of the camera for photographing the surface to be monitored.
In this way, since the installation candidate space is calculated based on the reference straight line indicating the direction in which the monitored surface is monitored, it is possible to obtain a camera installation candidate space suitable for photographing the monitored surface at an appropriate angle. ..

(2) The installation candidate space calculation unit 24 may calculate the installation candidate space by using the structure information 21 indicating the position and shape of the structure around the monitored object and the conical space. As a result, the space occupied by the structures around the monitored object can be excluded from the installation candidate space.

(3) The mounting candidate area calculation unit 25 may calculate the mounting candidate area of the camera by using the structure information 21 indicating the position and shape of the structure around the monitored object and the installation candidate space. This makes it possible to calculate the mounting candidate area for mounting the camera on the structure around the monitored object.

(4) The reference straight line setting unit 23 may use the normal of the monitored surface as the recommended monitoring direction. As a result, the installation candidate space and the installation candidate area can be calculated so that the camera can be installed in a direction in which the monitored surface can be easily seen.
(5) The reference straight line setting unit 23 may define at least one of the recommended monitoring direction and the allowable angle by at least one of the material of the monitoring target surface and the light source position in the monitoring space. As a result, the installation candidate space and the installation candidate area can be calculated so that the monitored surface is not obscured by the reflection of light on the monitored surface.

(Second Embodiment)
In the first embodiment, the selection receiving unit 22 accepts the selection of a single monitored surface 32. In the second embodiment and the third embodiment, the selection reception unit 22 accepts the selection of a plurality of monitored surface 32s.
See FIG. It is assumed that the selection receiving unit 22 receives the selection of a plurality of monitored surfaces 32a and 32b. However, the number of monitored surfaces to be selected is not limited to two, and three or more monitored surfaces may be selected.

In the second embodiment, the reference straight line setting unit 23 calculates the reference straight lines 33a and 33b for each of the plurality of monitored surfaces 32a and 32b, and the installation candidate space calculation unit 24 is a cone for each of the reference straight lines 33a and 33b. The shaped spaces 34a and 34b are calculated. The method of setting the recommended monitoring direction and the allowable angle θ, and the method of calculating the reference straight line and the conical space may be the same as those in the first embodiment. The recommended monitoring direction and the allowable angle θ of the reference straight lines 33a and 33b may be different for each surface to be monitored.

The installation candidate space calculation unit 24 obtains a camera installation candidate space based on the overlapping space 70 in which the cone-shaped spaces 34a and 34b overlap. Specifically, of the overlapping space 70, a subspace that does not overlap with the space occupied by the structure included in the structure information 21 is set as the installation candidate space. At this time, the cone-shaped spaces 34a and 34b are regarded as the spaces generated by the spotlight light source, and the space behind the structure is excluded from the installation candidate spaces. That is, the space that becomes the blind spot of the structure when viewed from the monitoring point 37a and the space that becomes the blind spot of the structure when viewed from the monitoring point 37b are excluded from the installation candidate spaces.

(Third Embodiment)
9 (a) to 9 (c) are referred to. In the third embodiment, the reference straight line setting unit 23 shares the recommended monitoring direction used when calculating the reference straight lines 33a and 33b for each of the plurality of monitoring target surfaces 32a and 32b.
Further, the installation candidate space calculation unit 24 shares the permissible angle θ used for calculating the cone-shaped spaces 34a and 34b.

For example, as shown in FIG. 9B, the reference straight line setting unit 23 calculates the integrated recommended monitoring direction 72 that integrates the recommended monitoring directions 71a and 71b set for each of the monitored surfaces 32a and 32b. The method of setting the individual recommended monitoring directions 71a and 71b may be the same as the method of setting the recommended monitoring direction of the first embodiment.
For example, the reference straight line setting unit 23 weights the recommended monitoring directions 71a and 71b according to the areas of all the selected monitoring target surfaces 32a and 32, calculates a weighted average vector, and sets it as the integrated recommended monitoring direction 72. You can do it. The recommended monitoring direction set for the monitored surface having the maximum area among all the selected monitored surfaces 32a and 32 may be set as the integrated recommended monitoring direction 72.

Further, for example, the installation candidate space calculation unit 24 calculates the integrated allowable angle by integrating the allowable angles set for each of the monitored surfaces 32a and 32b. The method of setting the individual permissible angles for the monitored surfaces 32a and 32b may be the same as the method of setting the permissible angles of the first embodiment.
For example, the installation candidate space calculation unit 24 may weight the allowable angles according to the areas of all the selected monitoring target surfaces 32a and 32b, calculate the weighted average, and set it as the integrated allowable angle. The allowable angle set for the monitored surface having the maximum area among all the selected monitored surfaces 32a and 32b may be set as the integrated allowable angle.

The reference straight line setting unit 23 calculates the reference straight lines 33a and 33b extending in the integrated recommended monitoring direction 72 from the monitoring points 37a and 37b of the monitoring target surfaces 32a and 32b, respectively. In the reference straight line setting unit 23, the installation candidate space calculation unit 24 calculates the cone-shaped spaces 34a and 34b using the integrated allowable angle for each of the reference straight lines 33a and 33b. The method of calculating the reference straight line and the conical space may be the same as that of the first embodiment.

The installation candidate space calculation unit 24 obtains a camera installation candidate space based on the overlapping space 70 in which the cone-shaped spaces 34a and 34b overlap. The method of calculating the camera installation candidate space is the same as that of the second embodiment.
The reference straight line setting unit 23 calculates an integrated monitoring point that integrates the monitoring points 37a and 37b of the monitoring target surfaces 32a and 32b, and calculates a single reference straight line extending from the integrated monitoring point in the integrated recommended monitoring direction 72. You may.

The integrated monitoring point may be calculated by a weighted average of the monitoring points 37a and 37b according to the areas of the monitoring target surfaces 32a and 32b, or the monitoring points of the monitoring target surfaces 32a and 32b having the maximum area may be used as the integrated monitoring points. ..
The installation candidate space calculation unit 24 calculates a single cone-shaped space with respect to a single reference straight line, and is based on the single cone-shaped space and the position and shape of the structure included in the structure information 21. To calculate the installation candidate space. This calculation method is the same as that of the first embodiment.

(Effects of the second embodiment and the third embodiment)
In the second embodiment, the selection reception unit 22 accepts the selection of a plurality of monitored surfaces. The installation candidate space calculation unit 24 calculates as the installation candidate space a space in which the conical spaces calculated for the reference straight lines of the plurality of monitoring target surfaces overlap.
In the third embodiment, the selection reception unit 22 accepts the selection of a plurality of monitored surfaces. The installation candidate space calculation unit 24 calculates an integrated recommended monitoring direction that integrates the recommended monitoring directions set for each of the plurality of monitoring target surfaces, and for each reference straight line extending from each of the plurality of monitoring target surfaces in the integrated recommended monitoring direction. The space where the calculated cone-shaped spaces overlap is set as the installation candidate space.
As a result, it is possible to obtain a camera installation candidate space suitable for photographing the monitored surface having irregularities at an appropriate angle.

10 ... installation support device, 11 ... storage unit, 12 ... control unit, 13 ... input device, 14 ... output device, 20 ... installation support program, 21 ... structure information, 22 ... selection reception unit, 23 ... reference straight line setting unit , 24 ... Installation candidate space calculation unit, 25 ... Installation candidate area calculation unit, 30 ... Monitoring object, 31 ... Monitoring space, 32, 32a, 32b ... Monitoring target surface, 33, 33a, 33b, 33c ... Reference straight line, 34 … Pyramid space

Claims (8)

A selection reception unit that accepts selection of the monitored surface to be monitored from among multiple surfaces that form a three-dimensional model of the monitored object,
A reference straight line setting unit that sets a reference straight line extending from the selected monitoring point on the monitoring target surface in the recommended monitoring direction set on the monitoring target surface, and
An installation candidate space calculation unit that calculates a conical space formed by a semi-linear locus having an acute angle equal to or less than an acute angle with the reference straight line at one end of the monitoring point as an installation candidate space for a camera that photographs the monitored surface. When,
An installation support device characterized by being equipped with. The selection reception unit accepts the selection of a plurality of the monitored surfaces,
The installation according to claim 1, wherein the installation candidate space calculation unit calculates as the installation candidate space a space in which the cone-shaped spaces calculated for the reference straight lines of the plurality of monitoring target surfaces overlap each other. Support device. The selection reception unit accepts the selection of a plurality of the monitored surfaces,
The installation candidate space calculation unit calculates an integrated recommended monitoring direction that integrates the recommended monitoring directions set for each of the plurality of monitoring target surfaces, and extends from each of the plurality of monitoring target surfaces in the integrated recommended monitoring direction. The installation support device according to claim 1, wherein a space in which the cone-shaped spaces calculated for each of the reference straight lines overlap is calculated as the installation candidate space. A claim characterized in that the installation candidate space calculation unit calculates the installation candidate space by using the structure information representing the position and shape of the structure around the monitored object and the cone-shaped space. The installation support device according to any one of Items 1 to 3. It is further provided with a mounting candidate area calculation unit that calculates a mounting candidate area of the camera using the structure information representing the position and shape of the structure around the monitored object and the installation candidate space. The installation support device according to any one of claims 1 to 4. The installation support device according to any one of claims 1 to 5, wherein the recommended monitoring direction is the normal of the surface to be monitored. Any one of claims 1 to 6, wherein at least one of the recommended monitoring direction and the allowable angle is defined by at least one of the material of the monitoring target surface and the position of the light source in the monitoring space. Installation support device described in. On the computer
A selection acceptance step that accepts the selection of the monitored surface to be monitored from among the multiple surfaces that form the three-dimensional model of the monitored object,
A reference straight line setting step for setting a reference straight line extending from the selected monitoring point on the monitored surface in the recommended monitoring direction set on the monitored surface, and
An installation candidate space calculation step of calculating a cone-shaped space formed by a semi-straight line having an acute angle equal to or less than the allowable angle with the monitoring point as one end as an installation candidate space of a camera for photographing the monitoring target surface.
An installation support program characterized by the execution of.

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