JP2013127710A - Camera retrieval device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely retrieve a camera without relying on sufficient information and inform a user of the camera.SOLUTION: A camera retrieval device 10 comprises: a camera information storage unit 17 that stores camera installation position information that monitors a vehicle running on a road in correspondence with information about orientation direction; a width specifying unit 21 that specifies the width of a road on which a vehicle runs; a camera retrieval width setting unit 22 that sets a retrieval width on the basis of the specified width; a camera retrieving unit 23 that retrieves a camera present within the retrieval width on the basis of the installation position information; an angle information extracting unit 24 that extracts information about orientation direction of the camera present in the retrieval width; a camera specifying unit 25 that, if an angle formed between the orientation direction of the camera and the orientation direction of the road on which a vehicle runs is equal to or within a predetermine angle, specifies the camera as an alarm target camera; and a camera reporting unit 26 that reports the presence of the specified alarm target camera.

Description

  The present invention relates to a camera search device that searches for a camera installed to monitor a vehicle traveling on a road.

  Conventionally, as disclosed in, for example, Patent Document 1, a technique for searching for a camera installed to monitor a vehicle traveling on a road has been considered. In this type of technical field, information about the installed camera is acquired in advance, and the camera is searched based on the information. The information related to the camera generally includes installation position information indicating the installation position of the camera and directivity direction information indicating the direction of the camera as the most basic information. In addition to information and pointing direction information, for example, various information such as information indicating the road that the camera is monitoring is added to enhance information about the camera, and the camera is searched using such rich information. Thus, the search accuracy of the camera is improved. However, depending on the region or country, for example, for military reasons or insufficient information and infrastructure maintenance, information related to cameras, including information other than installation location information and pointing direction information, may be provided. May not be available. In such a case, it is difficult to search for the camera with high accuracy.

JP 2000-20891 A

  The present invention has been made in view of the above circumstances, and its purpose is to accurately search for a camera and notify a user without relying on abundant information including information other than camera installation position information and pointing direction information. An object of the present invention is to provide a camera search device that can perform the above.

The present invention is characterized in that it is possible to search for a camera to be notified to a user based on camera installation position information and pointing direction information, which are the most basic information regarding the camera.
In other words, according to the first aspect of the present invention, the camera search device has the installation position information indicating the installation position of each camera and the orientation of each camera for a plurality of cameras installed to monitor a vehicle traveling on the road. The direction information indicating the direction is stored in the camera information storage unit in association with each other. In this camera search device, the width specifying means specifies the width of the traveling road on which the vehicle travels, the search width setting means sets the search width based on the width specified by the width specifying means, and the camera search means includes: Based on the installation position information stored in the camera information storage unit, the camera existing in the search width is searched, and the directivity direction information extracting means is the directivity direction information of the camera existing in the search width searched by the camera search means. Are extracted from the camera information storage unit. Then, the camera specifying means, when the angle formed by the directivity direction indicated by the directivity direction information extracted by the directivity direction information extraction means and the directivity direction of the traveling road is within a predetermined angle, determines the camera corresponding to the directivity direction information. The camera is specified as the notification target camera, and the camera notification means notifies the presence of the notification target camera specified by the camera specification means.

  That is, using the installation position information and the direction information, which are the most basic information about the camera, a camera directed to the road, that is, a camera that monitors the road is identified, and the camera is notified to the user. It was configured as follows. Thus, the camera can be searched with high accuracy and notified to the user without relying on substantial information relating to the camera, that is, substantial information including information other than the installation position information and the pointing direction information.

  By the way, even if the camera is not directed to the traveling road, there is a possibility that the camera is monitoring the traveling road when the pointing direction of the camera and the pointing direction of the traveling road are parallel. Therefore, as in the invention described in claim 2, the camera specifying means can also determine the pointing direction even when the pointing direction indicated by the pointing direction information extracted by the pointing direction information extracting means is parallel to the pointing direction of the traveling road. The camera corresponding to the information may be configured to be specified as a notification target camera. Thereby, a camera directed in parallel with the traveling road can be searched as a camera that may be monitoring the traveling road and notified to the user.

As in the invention described in claim 3, the search width setting means can be configured to set a width obtained by adding a predetermined value to the width specified by the width specifying means as the search width. The invention according to claim 3 specifically limits an example of the setting mode of the search width based on the width.
Here, the type of road can be specified to some extent by the width of the road. For example, when the width is wide, the road is specified as a large road, while when the width is narrow, The road can be identified as a medium or small road. Therefore, as in the invention described in claim 4, the search width setting means sets a value obtained by multiplying the width specified by the width specifying means by a predetermined coefficient as a predetermined value when setting the search width. Configure. Thus, by calculating the predetermined value used when setting the search width that becomes the search range of the camera based on the width of the road, it is possible to set the search width according to the type of road, It becomes possible to search with high accuracy.

1 is a functional block diagram schematically showing the overall configuration of a camera search device according to an embodiment of the present invention. Figure showing an example of the road attribute database The figure which shows an example of the relationship between the width of a road, a margin value, and a camera search width The figure which shows an example of camera information Flowchart showing contents of camera search flow in camera search notification operation The flowchart which shows the contents of the camera narrowing flow in the camera search notification operation The figure which shows an example of the relationship between a road, the installation position of a camera, and a pointing direction A flowchart showing the contents of the camera notification flow in the camera search notification operation The figure which shows an example of the display content by camera display processing

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In this case, the camera search device 10 shown in FIG. 1 includes a so-called navigation device mounted on a vehicle, and includes a control unit 11, a position detection unit 12, an operation input unit 13, a display output unit 14, and a voice output unit 15. , A map information storage unit 16, a camera information storage unit 17, a navigation function unit 18, and the like.
The control unit 11 is mainly configured by a microcomputer having a CPU, a RAM, a ROM, an I / O bus, and the like (not shown). The control unit 11 controls the overall operation of the camera search device 10 such as a camera search notification operation to be described later in detail according to a computer program stored in a storage medium such as a ROM.

  Further, the control unit 11 executes a computer program to thereby execute a width specification processing unit 21, a camera search width setting processing unit 22, a camera search processing unit 23, an angle information extraction processing unit 24, a camera specification processing unit 25, a camera The notification processing unit 26 is virtually realized by software. The width specification processing unit 21 corresponds to the width specification means described in the claims, and the camera search width setting processing unit 22 corresponds to the search width setting means described in the claims, and the camera search processing. The unit 23 corresponds to the camera search unit described in the claims, the angle information extraction processing unit 24 corresponds to the pointing direction information extraction unit described in the claims, and the camera identification processing unit 25 corresponds to the patent. The camera notification processing unit 26 corresponds to the camera notification unit described in the claims.

  The position detection unit 12 is a detection module for detecting the current position of the vehicle on which the camera search device 10 is mounted. The position detection unit 12 includes various sensors such as an orientation sensor 12a, a gyro sensor 12b, a distance sensor 12c, and a positioning radio wave receiver 12d. The direction sensor 12a detects the direction of the vehicle. The gyro sensor 12b detects the rotation angle of the vehicle. The distance sensor 12c detects the travel distance of the vehicle. The positioning radio wave receiver 12d receives radio waves transmitted from a positioning satellite (not shown) in order to determine the current position of the vehicle by the positioning system. The position detection unit 12 detects the current position of the vehicle while mutually complementing detection data obtained from these sensors.

  The operation input unit 13 includes, for example, a mechanical switch (not shown) or a touch switch (not shown) provided on the screen of the display output unit 14. The user can make various setting changes of the camera search device 10 via the operation input unit 13, for example, the setting change of the display mode of the notification target camera or the setting change of the voice output mode. The display output unit 14 has a display screen composed of a color display such as a liquid crystal or an organic EL, for example, and displays various types of information based on a display output signal from the control unit 11. The audio output unit 15 is composed of, for example, a vehicle-mounted speaker, and outputs various sounds based on an audio output signal from the control unit 11.

  The map information storage unit 16 is composed of a storage medium such as a DVD or a hard disk drive, and stores map information. The map information stored in the map information storage unit 16 is provided in advance from another storage medium such as a DVD or a hard disk drive, or distributed from an external information providing server (not shown). It includes various data such as road data, landmark data, map matching data, destination data, and table data for converting traffic information into road data formed by links connecting nodes.

  Further, the map information includes, for example, a road attribute database shown in FIG. This road attribute database is a database that stores road-related attributes included in map information. In this case, as road-related attributes, road ID, road angle information, width information, coefficient information for setting margin values, margin values Information and camera search width information are set. The road attribute database shown in FIG. 2 is an example, and the contents can be changed and set as appropriate.

  The road ID is a road identification number uniquely assigned to each road included in the map information. The road angle information is information indicating the direction of each road, that is, the direction in which the vehicle travels on each road. In this case, the direction toward true north on the map is 0 degrees. Is set as a standard. The width information is information indicating the width of each road, in other words, the road width. The coefficient information for setting the margin value is information indicating a coefficient for setting a margin value to be added to the width of the road when setting the camera search width. In this case, the coefficient is set according to the width of the road. Has been. That is, the coefficient of the road whose width is 0 meter or more and less than 5 meters is set to 0.5 in this case, and the coefficient of the road whose width is 5 meters or more and less than 10 is 0.3 in this case. The coefficient of the road that is set and has a width of 10 meters or more is set to 0.1 in this case. The margin value information is information indicating a margin value set for each road, and a value obtained by multiplying the width of the road by a margin value setting coefficient is set as the margin value. The camera search width information is information indicating the camera search width set for each road.

  For example, as shown in FIG. 3, the camera search width C is set to a width obtained by adding a half value of the margin value B to each end of the width A of the road. Therefore, for example, the camera search width C of the road with the road ID “0” shown in FIG. 2 is “2.0” meters which is the margin value B of this road at both ends of “4.0” meters which is the width A of the road. A value of 1/2 of “meter”, that is, “6.0” meter, which is a width to which “1.0” is added, is set. The road width A and the camera search width C are set symmetrically about the road center line CL.

  The camera information storage unit 17 is composed of a storage medium such as a DVD or a hard disk drive, and stores camera information. The camera information stored in the camera information storage unit 17 is provided in advance from another storage medium such as a DVD or a hard disk drive, or is distributed from an external information providing server (not shown). This camera information is, for example, information as shown in FIG. 4. For a plurality of cameras installed on the upper side or side of the road in order to monitor a vehicle traveling on the road, the camera information indicates the installation position of each camera. This is information in which “installation position information” and “angle information” indicating the directivity direction of each camera are stored in association with each camera. In this case, the installation position information of each camera is information including latitude information and longitude information. In addition, the angle information of each camera is information corresponding to the directivity direction information described in the claims, and in this case, the direction toward true north is set to 0 degrees, and the direction toward true north is set as a reference. ing. Further, the camera information shown in FIG. 4 is an example, and the contents can be changed and set as appropriate.

  The map information storage unit 16 and the camera information storage unit 17 described above may be configured by a common storage medium, but are preferably configured by separate storage media as in the present embodiment. As a result, the map information stored in the map information storage unit 16 and the camera information stored in the camera information storage unit 17 can be managed separately, and each information can be updated, corrected, deleted, etc. It can be executed without affecting each other.

  The navigation function unit 18 searches for a route from the current position of the vehicle to the input destination and performs a function of guiding the vehicle based on the route, a so-called navigation function. When the route guidance of the vehicle is not executed, the navigation function unit 18 displays a map around the current position of the vehicle on the display output unit 14 as a default display, and superimposes the current map of the vehicle on the displayed map. The current position mark indicating the position and the traveling direction is displayed. At this time, the navigation function unit 18 performs a map matching process for aligning the current position mark of the vehicle on the road in the map. This current position mark moves on the map as the vehicle travels. Further, the map displayed on the screen of the display output unit 15 is scrolled according to the current position of the vehicle. When the navigation function unit 18 executes route guidance for the vehicle, the navigation function unit 18 displays a route guidance screen on the display output unit 14 and guides the vehicle based on the searched guidance route.

The width specification processing unit 21 executes the width specification processing in response to a command signal from the control unit 11. This width specifying process specifies the road on which the vehicle is traveling as a traveling road based on the current position of the vehicle detected by the position detection unit 12 and the map information stored in the map information storage unit 16. In this process, the width of the traveling road is specified based on the road attribute database stored in the map information storage unit 16.
The camera search width setting processing unit 22 executes a camera search width setting process in response to a command signal from the control unit 11. As shown in FIG. 3, the camera search width setting process is performed by adding 1 of a predetermined margin value B set corresponding to the travel road at both ends of the width A of the travel road specified by the width specification processing unit 21. This is a process of calculating the width to which the value of / 2 is assigned and setting the calculated width as the camera search width C.

The camera search processing unit 23 executes camera search processing in response to a command signal from the control unit 11. This camera search process is a process of searching for a camera existing within the camera search width set by the camera search width setting processing unit 22 based on the installation position information of each camera stored in the camera information storage unit 17. .
The angle information extraction processing unit 24 executes angle information extraction processing in response to a command signal from the control unit 11. This angle information extraction processing is processing for extracting angle information of the camera searched by the camera search processing unit 23, that is, the camera existing within the camera search width set by the camera search width setting processing unit 22 from the camera information storage unit 17. It is.

The camera identification processing unit 25 executes camera identification processing in response to a command signal from the control unit 11. In this camera specifying process, the direction indicated by the angle information extracted by the angle information extraction processing unit 24, that is, the angle formed by the direction of the camera existing within the camera search width and the direction of the road is calculated. When the calculated angle is within a predetermined angle, the camera corresponding to the angle information is specified as a notification target camera. Note that the direction in which the traveling road is directed is specified based on road angle information included in the road attribute database shown in FIG. That is, the control unit 11 reads the road angle information stored corresponding to the road ID of the traveling road, and specifies the direction of the traveling road.
The camera notification processing unit 26 performs camera notification processing in response to a command signal from the control unit 11. This camera notification process is a process of notifying the presence of the notification target camera specified by the camera specification processing unit 25 via at least one of the display output unit 14 and the audio output unit 15.

Next, the operation of the camera search device 10 configured as described above, that is, the camera search notification operation will be described with reference to FIGS. This camera search notification operation includes a camera search flow shown in FIG. 5, a camera narrowing flow shown in FIG. 6, and a camera notification flow shown in FIG.
(1) Camera Search Flow As shown in FIG. 5, in this camera search flow, the control unit 11 of the camera search device 10 first specifies the current position of the vehicle based on the input data from the position detection unit 12 ( Step A1), the road where the vehicle is traveling is identified as a traveling road by collating the current position of the identified vehicle with the map information stored in the map information storage unit 16 (step A2). Next, the control unit 11 extracts camera search width information corresponding to the identified road ID of the traveling road from the road attribute database (step A3).

  Next, the control unit 11 determines whether or not the camera search device 10 is executing route guidance for the vehicle (step A4). When the camera search device 10 is performing route guidance (step A4: YES), the control unit 11 proceeds to step A3 along the route being guided, that is, along the road on which the vehicle is being routed. The extracted camera search width is set, and cameras existing within the camera search width are searched (step A5). The control unit 11 executes this camera search process while tracing the traveling road (guidance route) in the route being guided, that is, in the region from the current position of the vehicle to the route guidance destination at least in the traveling road. To do. And if the control part 11 searches all the cameras which exist in a camera search width | variety along the route | guide route | route currently guided (step A6: YES), this camera search flow will be complete | finished.

  On the other hand, when the camera search device 10 is not executing route guidance (step A4: NO), the control unit 11 determines the traveling direction of the road on which the vehicle is traveling, that is, the traveling road when the route guidance is not performed. The camera search width extracted in step A3 is set in a predetermined range in front, and cameras existing within the camera search width are searched (step A7). The control unit 11 executes the camera search process while tracing the traveling road within a predetermined range of the traveling road. And if the control part 11 searches all the cameras which exist in a camera search width within the predetermined range ahead of the advancing direction of a vehicle (step A8: YES), this camera search flow will be complete | finished. As described above, this camera search flow is a flow for uniformly searching all cameras existing within the camera search width set on the travel road on which the vehicle is traveling.

(2) Camera Refinement Flow When the control unit 11 of the camera search device 10 ends the camera search flow, the camera search flow starts. As shown in FIG. 6, in this camera search flow, the control unit 11 determines whether or not a camera has been searched by the camera search flow, that is, whether or not at least one camera has been searched (step B1). When the camera is not searched by the camera search flow (step B1: NO), the control unit 11 ends this camera narrowing flow. On the other hand, when a camera is searched by the camera search flow (step B1: YES), the control unit 11 reads angle information corresponding to the searched camera from the camera information storage unit 17 (step B2). And the control part 11 performs a camera determination process based on the read angle information of the camera (step B3).

This camera determination process is a process for determining whether or not the camera searched by the camera search flow is a “notification target camera”. Specifically, the control unit 11 selects the searched camera according to the relationship between the direction of the camera and the direction of the traveling road, such as “warning target camera”, “non-warning target camera”, and “attention target”. It is classified as one of “camera”.
That is, the control unit 11 determines that the smaller one of the angles formed by the camera directing direction and the traveling road directing direction is within a predetermined angle, in this case, within 20 degrees, the camera is moved to the traveling road. Is identified as a camera to be warned, and is identified as a camera to be warned. The warning target camera specified in this way corresponds to the notification target camera described in the claims. On the other hand, if the smaller one of the angles formed by the camera directing direction and the traveling road directing direction is within a predetermined angle, in this case, not within 20 degrees, the control unit 11 sets the camera as the traveling road. Is identified as a camera installed to monitor a different road, for example, a road adjacent to the traveling road, and is identified as a camera not subject to warning.

  By the way, when the direction of the camera and the direction of the road are parallel, that is, when the angle between the direction of the camera and the direction of the road is 0 degrees, the camera monitors the road. It is impossible to clearly determine whether the camera is a camera that monitors the road different from the traveling road. Therefore, when the angle formed by the camera directing direction and the traveling road directing direction is 0 degree, the control unit 11 is a camera whose monitoring target is unknown, that is, a camera that monitors the traveling road. There is a possibility that the camera is a camera that may be a camera that monitors a road other than the traveling road, and is identified as a camera to be noted. Note that the attention target camera specified in this way corresponds to the notification target camera described in the claims.

  Here, the contents of the camera determination process executed as described above will be described visually with reference to FIG. That is, the smaller angle α of the angles formed by the directivity direction a of the camera CM (a) and the directivity direction r of the traveling road R, and the directivity direction b of the camera CM (b) and the directivity direction r of the travel road R. In this case, the smaller angle β among the angles formed by and is within a predetermined angle of 20 degrees. Therefore, the camera CM (a) and the camera CM (b) are specified as warning target cameras for monitoring the traveling road R on which the vehicle is traveling. On the other hand, the smaller angle γ of the angles formed by the directivity direction c of the camera CM (c) and the directivity direction r of the traveling road R is larger than 20 degrees which is a predetermined angle in this case. Therefore, this camera CM (c) is specified as a camera not subject to warning for monitoring a road different from the traveling road R. For the camera CM (d), the angle formed by the directivity direction d and the directivity direction r of the traveling road R is 0 degrees and is parallel to each other. Therefore, this camera CM (d) is specified as a camera to be watched whose monitoring target is unknown.

  As described above, when the cameras existing within the camera search range are classified into any one of the warning target camera, the non-warning target camera, and the attention target camera, the control unit 11 executes the camera notification mode setting process. (Step B4). In this camera notification mode setting process, the control unit 11 sets the display color to “red” in this case as the notification mode of the camera classified as the warning target camera. Moreover, the control part 11 sets a display color to "white" in this case as an alerting | reporting aspect of the camera classified into the camera which is not a warning object. Moreover, the control part 11 sets a display color to "yellow" in this case as an alerting | reporting aspect of the camera classified into the attention object camera. The control part 11 will complete | finish this camera narrowing flow, if the alerting | reporting aspect of the camera which exists in a camera search width | variety is each set. As described above, this camera narrowing flow is a flow for narrowing down cameras to be warned from the cameras searched by the camera search flow, that is, the cameras existing within the camera search width.

(3) Camera Notification Flow When the control unit 11 of the camera search device 10 ends the camera narrowing flow, the camera notification flow starts. As shown in FIG. 8, in this camera notification flow, the control unit 11 executes a camera display position matching process (step C1). In this camera display position matching process, the control unit 11 specifies the camera installation position searched by the camera search flow based on the camera installation position information stored in the camera information storage unit 17 and specifies the camera installation position information. The display position of the camera is set by collating the installation position with the coordinates on the map. As a result, the camera searched by the camera search flow is displayed at the position where the camera is actually installed on the map displayed on the display output unit 14.

  Next, the control part 11 performs a camera display process (step C2). In this camera display process, the control unit 11 displays the camera searched by the camera search flow according to the display position set by the matching process. At this time, the control unit 11 displays the camera in the display color set in the camera notification mode setting process. FIG. 9 is a diagram illustrating an example of display contents displayed on the display output unit 14 by the camera display process. That is, when the vehicle is traveling on the general road R1, the camera CM (x) that monitors the general road R1, that is, the travel road, is displayed in “red” as a warning target camera. Cameras CM (y) that monitor different highways R2 are displayed in “white” as cameras that are not subject to warning. The camera CM (z) parallel to both the general road R1 and the highway R2 is displayed in “yellow” as a camera to be noted. The display output unit 14 displays message information M for alerting the user, for example, together with the cameras CM (x) to CM (z) searched by the camera search flow. In FIG. 9, the fact that the camera CM (x) is displayed in “red” is expressed by painting the camera CM (x), and the camera CM (y) is displayed in “white”. This is expressed by indicating the camera CM (y) in white, and expressing that the camera CM (z) is displayed in “yellow” by indicating the camera CM (z) by hatching. ing.

As described above, according to the present embodiment, the camera search device 10 uses the installation position information and the angle information, which are the most basic information as information about the camera, to be a camera directed to the traveling road, that is, traveling. A camera for monitoring the road is identified and the camera is notified to the user. Thus, the camera can be searched with high accuracy and notified to the user without relying on substantial information relating to the camera, that is, substantial information including information other than installation position information and angle information.
In addition, the camera search device 10 is configured to identify the camera as the attention target camera when the direction of the camera and the direction of the traveling road are parallel. Thereby, a camera directed in parallel with the traveling road can be searched as a camera that may be monitoring the traveling road and notified to the user.

  Further, the camera search device 10 sets a value obtained by multiplying the width of the traveling road by a predetermined coefficient as a margin value. That is, the camera search device 10 sets the margin value when setting the camera search width based on the width of the road. Here, the type of road can be specified to some extent by the width of the road. For example, when the width is wide, the road is specified as a large road such as an expressway and the width is narrow. In this case, it can be specified that the road is a medium or small road such as a general road or a street. Therefore, according to the camera search device 10 of the present embodiment in which the margin value for setting the camera search width is calculated based on the width of the road, it is possible to set the camera search width according to the type of road. And the camera can be searched with higher accuracy.

In addition, this invention is not limited only to one embodiment mentioned above, It can apply to various embodiment in the range which does not deviate from the summary, For example, it can deform | transform or expand as follows. .
The notification mode of the notification target camera is not limited to the notification mode in which the display color is changed. For example, it is possible to adopt a display mode in which the camera display size is different, such as displaying a warning target camera large and displaying a warning non-warning camera or a caution target camera small. In addition, the camera to be warned blinks and is displayed, and the camera not to be warned and the camera to be warned are turned on and displayed. For example, various notification modes can be adopted. In short, various modes can be adopted as long as they are at least a notification mode that can clearly identify a camera to be warned and other cameras.

The notification target camera may be notified by sound output via the sound output unit 15. Further, the notification target camera may be configured to notify in combination with the display output via the display output unit 14 and the audio output via the audio output unit 15.
The road attribute database can be constructed so as to include, for example, elevated information indicating whether the road is an elevated road, attribute information regarding an adjacent road, and the like.
The present invention is not intended to inform a vehicle traveling at a speed that violates the legal speed, for example, by preliminarily informing the presence of the camera, thereby maintaining the vehicle speed at an appropriate speed. This is useful when alerting the user to do.

  In the drawings, 10 is a camera search device, 17 is a camera information storage unit, 21 is a width specification processing unit (width specification unit), 22 is a camera search width setting processing unit (search width setting unit), and 23 is a camera search processing unit ( (Camera search means), 24 is an angle information extraction processing section (directivity direction information extraction means), 25 is a camera identification processing section (camera identification means), and 26 is a camera notification processing section (camera notification means).

Claims (4)

A camera information storage unit that stores installation position information indicating the installation position of each camera and pointing direction information indicating the directivity direction of each camera in association with a plurality of cameras installed to monitor a vehicle traveling on a road; ,
A width specifying means for specifying the width of the road on which the vehicle travels;
Search width setting means for setting a search width based on the width specified by the width specifying means;
Camera search means for searching for a camera within the search width based on the installation position information stored in the camera information storage unit;
Directivity direction information extraction means for extracting the directivity direction information of the cameras existing within the search width searched by the camera search means from the camera information storage unit;
When an angle formed by the directivity direction indicated by the directivity direction information extracted by the directivity direction information extraction unit and the directivity direction of the traveling road is within a predetermined angle, a camera corresponding to the directivity direction information is set as a notification target camera. Camera identification means to identify;
Camera notification means for notifying the presence of the notification target camera specified by the camera specifying means;
A camera search device comprising:   The camera specifying unit is configured to notify the camera corresponding to the directivity direction information even when the directivity direction indicated by the directivity direction information extracted by the directivity direction information extraction unit and the directivity direction of the traveling road are parallel. The camera search device according to claim 1, wherein the camera search device is specified as a camera.   The camera search device according to claim 1, wherein the search width setting unit sets, as the search width, a width obtained by adding a predetermined value to the width specified by the width specifying unit.   The camera search device according to claim 3, wherein the search width setting unit sets, as the predetermined value, a value obtained by multiplying the width specified by the width specifying unit by a predetermined coefficient.

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