JP2007312113A - Video switching apparatus and video switching method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video switching apparatus capable of photographing a specific position by another camera when the specific position can not be photographed by a certain camera. <P>SOLUTION: The video switching apparatus comprises: a storage part 112 for recording positional information concerned with the position of a specific photographing target included in prescribed photographing targets, position registration information including camera information concerned with a camera 140 for photographing the specific photographing target and history followed up in each position; a photographing video receiving part for successively receiving the photographing videos of the specific photographing target photographed by the camera 140; and a cross point 113 for switching the camera for photographing the specific photographing target from a camera 141 on the basis of the position registration information when a reception judgment part judges that the photographing videos of the camera 141 are not successively received. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a video switching device that switches a plurality of cameras that shoot a predetermined shooting target, a video switching method, and a camera system that includes a video switching device that switches a plurality of cameras that shoot a predetermined shooting target.

  Conventionally, a camera system has been used that can display and record video data captured by a camera or the like at a location away from the location where the camera is installed via a network or the like. ing.

In such a camera system, for example, when a failure of a transmission controller for transmitting a video to a remote place or a disconnection of a wiring occurs, it is known to switch a transmission system and transmit a video signal to a display device ( For example, see Patent Document 1). As a result, when video data captured by the camera is distributed to a display device or the like, if there is an abnormality in the transmission path, data is transmitted via another path.
JP 2004-172701 A

  However, in the conventional camera system, for example, when a certain important position (position) is taken by a camera or the like, the camera itself is broken or disconnected, or the above-mentioned importance is forced by a third party. When the camera is pointed in a different direction instead of the correct position, the video data of the important position may be displayed on the monitor or the video data cannot be temporarily recorded. .

  The present invention has been made in view of the above circumstances, and when a camera cannot capture a specific position, the video switching apparatus and camera system can capture the position with another camera. An object of the present invention is to provide a video switching method.

  In order to achieve the above object, a video switching device according to the present invention is a video switching device that switches a plurality of cameras that capture a predetermined imaging target, and that is a specific imaging target included in the predetermined imaging target. A storage unit that records position registration information including position information related to a position and camera information related to a camera that captures the specific image capturing target, and image capturing that sequentially receives captured images of the specific image capturing target captured by the first camera A video reception unit, a reception determination unit that determines whether the captured video is sequentially received by the captured video reception unit, and the reception determination unit that determines that the captured video is not sequentially received, A photographing camera switching unit that switches a camera for photographing the specific photographing object from the first camera based on position registration information; It is set to.

  With this configuration, when a certain camera cannot capture a specific position, the other camera can capture that position.

  In the video switching device according to the present invention, the shooting camera switching unit may select a camera for shooting the specific shooting target from the first camera when the reception determination unit determines the shooting target other than the specific shooting target. Is switched to the second camera that is shooting the image, and the second camera is directed to the position of the specific shooting target.

  With this configuration, when a certain first camera cannot capture a specific position, the second camera that is capturing a position other than the specific position at that time can capture that position. Therefore, it is possible to prevent the captured video at a specific position that cannot be captured by the first camera from being interrupted.

  Further, the video switching device of the present invention is configured such that the shooting camera switching unit switches the cameras based on the order of cameras registered in the position registration information for each specific shooting target.

  With this configuration, when a certain camera can no longer capture a specific position, it is possible to automatically switch to the camera that captures that position next.

  The video switching device according to the present invention further includes a state monitoring unit that monitors a current usage state of the plurality of cameras and registers the usage state information as the usage state information, and the photographing camera switching unit is based on the usage state information. The camera is switched.

  With this configuration, when a certain camera can no longer shoot a specific position, taking into account the use state of the other camera at that time, for example, shooting at another position is performed by one unit. It is possible to prevent the camera from being automatically selected as the next camera for shooting the position.

  Further, in the video switching device of the present invention, the storage unit has camera position information related to the position of the camera, and the photographing camera switching unit is configured to specify the specific information based on the position registration information and the camera position information. Of the cameras registered in the position registration information for each shooting target, the camera is switched to the camera having the closest distance from the specific shooting target.

  With this configuration, if a camera can no longer capture a specific position, it automatically and efficiently follows the position by switching to the camera closest to that position in consideration of the camera's location. Can be done up.

  Further, in the video switching device according to the present invention, the storage unit has shooting importance for each specific shooting target as the position registration information, and the shooting camera switching unit is configured to use the camera based on the shooting importance. It is set as the structure which switches.

  With this configuration, if a camera cannot shoot a specific position with high importance, the camera will automatically follow up the video with a position that is lower than that. can do.

  In the video switching device according to the present invention, the storage unit includes monitoring range information relating to a monitoring range including the imaging target and monitoring video information relating to a video in the monitoring range as the position registration information. The reception determination unit determines whether or not the captured video captured by the captured video reception unit is a video within the monitoring range based on the position registration information, and the captured camera switching unit When the reception determination unit determines that the captured video is not within the monitoring range, the camera is switched.

  With this configuration, by focusing on a wider monitoring range than a specific shooting target, for example, when the shooting direction of the camera has changed significantly from the desired shooting direction, the position is changed by another camera. It is possible to follow up automatically.

  Further, the camera system of the present invention is a camera system having a video switching device that switches a plurality of cameras that shoot a predetermined shooting target, and the video switching device is a specific one included in the predetermined shooting target. A storage unit for recording position registration information including position information relating to the position of the subject to be photographed and camera information relating to a camera for photographing the particular subject, and a photographed image of the particular subject to be photographed by the first camera The received video image receiving unit, the reception determination unit that determines whether or not the captured video image is sequentially received by the captured video image receiving unit, and the reception determination unit determined that the captured video image is not sequentially received In this case, based on the position registration information, the camera that switches the camera for shooting the specific shooting object from the first camera is used. It is configured to have a camera switching unit.

  With this configuration, when a certain camera cannot capture a specific position, the other camera can capture that position.

  Further, the camera system of the present invention is a history recording for recording a history including identification information of the switched camera and information on the date and time of switching in a situation where the video of the plurality of cameras is recorded on a recorder. And a control unit that searches and presents a recorded video of a specific camera and date and time to the recorder from information related to the camera and date and time read from the history recording unit.

  With this configuration, since information indicating which camera followed up for each position is recorded as a history, in the situation where the video of the plurality of cameras is recorded on the recorder, the position of the position where the abnormality is detected is recorded. When confirming the recorded video, the desired video can be easily searched and reproduced by using the camera identification information and date / time information in the history.

  The video switching method of the present invention is a video switching method in which a plurality of cameras that shoot a predetermined shooting target is switched, and includes position information regarding a position of a specific shooting target included in the predetermined shooting target, and A step of recording position registration information including camera information relating to a camera that shoots the specific shooting target; a step of sequentially receiving shot images of the specific shooting target shot by the first camera; and the shooting Based on the position registration information, when it is determined in the reception determination step that the video is sequentially received by the captured video receiver, and in the reception determination step that the captured video is not sequentially received And a step of switching a camera for photographing the specific photographing object from the first camera. There.

  By this method, when a certain camera cannot photograph a specific position, the other camera can photograph that position.

  The present invention can provide a video switching device, a camera system, and a video switching method that can capture a specific position with a camera when a camera cannot capture a specific position.

  Hereinafter, a video switching device according to an embodiment of the present invention will be described with reference to the drawings.

(Embodiment)
FIG. 1 is a conceptual diagram when photographing a position 20 with a plurality of cameras 30 in the embodiment of the present invention. In the present embodiment, the following camera system is assumed. The camera system includes a plurality of cameras 30 (30A, 30B, 30C), a matrix switcher 10, a recorder 40, and a monitor 50. First, the position information of the position 20 is registered for a certain position 20 by a plurality of cameras 30 (30A, 30B, 30C,...). Although three cameras 30 are shown in the present embodiment, the number may be more or less than this. The position information is information regarding the installation location of the position 20.

  The matrix switcher 10 records an image when the image taken by the camera 30A cannot be transmitted due to a disconnection of the network or the like while the image at a certain position 20 is monitored by the camera 30A, for example. The video imaged by the camera 30A is not transmitted to the recorder 40 and the monitor 50 that performs display for the purpose of video monitoring, and the video image at the position 20 is lost.

  Therefore, when such a situation occurs, another camera (for example, the camera 30B) that has recorded the position information of the position 20 is automatically controlled to face the position 20, and the situation of the subsequent position 20 is changed. The image is taken by the camera 30B, and appropriately transmitted to the recorder 40 and the monitor 50 via the network. Further, when the camera 30B cannot capture the image at the position 20 due to a failure of the camera 30B or the like, the camera 30B is followed by another camera (for example, the camera 30C). By performing the follow-up as described above, the image at the position 20 is captured by any one of the camera 30A, the camera 30B, and the camera 30C.

  In the above case, the video at position 20 is taken by a plurality of cameras 30, but information on which camera was taking the video at position 20 was recorded inside the matrix switcher 10. Is done. That is, for each position, information for identifying the camera 30 such as the camera number of the camera 30 that shot the position 20 and information about the time when the camera 30 started shooting the position 20 are recorded for each position. ing.

  Therefore, when confirming the video of the position 20 after shooting, the monitor 50 displays, for example, the follow-up history of the position 20, and by selecting the history of the time zone to be confirmed by the controller 60 and performing the reproduction operation, the recorder A video to be confirmed can be selected from the number of cameras followed up from 40 and the shooting start time, and can be confirmed on the monitor 50.

Next, a specific configuration of the camera system will be described.
FIG. 2 is a block diagram of the camera system 100 according to the embodiment of the present invention. The camera system 100 includes a video switching device 110, a controller 120, a monitor 130, a plurality of cameras 140 (cameras 141, 142, 143,...), And a recorder 150. The video switching device 110 includes a control unit 111, a storage unit 112, a cross point 113, and a state monitoring unit 114. As the video switching device 110, a matrix switcher or the like is assumed.

  Part of the control unit 111 is an example of a captured video reception unit. Part of the control unit 111 is an example of a reception determination unit. The photographing camera switching unit 113 is an example of a cross point. A part of the storage unit 112 is an example of a history recording unit.

  The control unit 111 controls the storage unit 112, the cross point 113, and the state monitoring unit 114. In addition, the control unit 111 may detect a disconnection in the network connecting the camera 140 whose current position 20 is to be photographed and the video switching device 110, a failure in the camera 140, or position registration information. A case where the camera is forcibly directed in a shooting direction not based on the camera is detected as an abnormal state. Here, when detecting the abnormality, the state monitoring unit 114 recognizes that the shooting direction of the camera 140 has been changed when the camera 140 recognizes that the camera 140 is shooting a video that is contrary to the shooting direction based on the position registration information. Detect and judge abnormal state. Further, when a video that should be transmitted from the camera 140 cannot be received for a predetermined time or more, a disconnection of the network or a failure of the camera 140 is detected and an abnormal state is determined.

  If an abnormal state is detected, the camera 140 that captures the next position 20 is designated based on the position registration information, and the photographing direction is changed from the direction in which the designated camera 140 is currently photographed to the direction of the position 20. . Here, for example, the following four methods are conceivable as a method for selecting the camera 140 to be photographed next.

  (1) Selection is made in the order of the cameras 140 registered in the item position (here, position 20 is set as position A) in the position registration information recorded in the storage unit 112. For example, in the example shown in FIG. 3, when the camera 141 becomes unusable, the camera 142 is used, and when the camera 142 becomes unusable, the camera 143 is used.

  Here, FIG. 3 shows position registration information in which a camera and a preset are registered for each position to be monitored. This preset is monitoring position information of the camera, and monitoring position information regarding a plurality of positions can be registered for each camera. For example, in FIG. 3, the monitoring position information regarding position A is registered as preset 1 for camera 141, preset 2 for camera 142, and preset 3 for camera 143. Similarly, the monitoring position information regarding position B is registered as preset 4 for camera 141, preset 5 for camera 142, and preset 6 for camera 143.

  (2) Based on the monitoring result of the state monitoring unit 114, a camera 140 that is not used by a user or an event is preferentially selected. For example, as shown in FIG. 4, when the camera 141 is being used by another user a and the camera 142 is already in a state where another position B must be monitored (this state is referred to as “alarm”). The camera 143 is used preferentially. This monitoring result is used as status monitoring information. FIG. 4 is a diagram showing a specific example of the state monitoring information in the embodiment of the present invention.

  (3) Based on the position information of the position recorded in the storage unit 112 and the position information of the camera 140, a camera to be used is selected in the order of the shortest distance from the target position to the camera 140.

  (4) A camera to be used is selected based on the photographing importance for each position recorded in the storage unit 112. This shooting importance level can be arbitrarily set by the user depending on the importance level of the shooting location.

  In addition, when playing back the recorded video by the recorder 150, the control unit 111 records the recorded video stored in the recorder with respect to the recorder on the condition of the camera number, the date, and the like from the follow-up history selected by the controller 120. Search and give instructions to play the corresponding recorded video. FIG. 5 is an example of a follow-up history regarding position A. For example, in the example shown in FIG. 5, when the controller 120 selects the history number 1 and performs a playback operation, the recorded video of the camera 142 of 7:10 on January 3, 2006 is recorded to the recorder 150. Search and play.

  The storage unit 112 records position registration information including position information of a certain position (for example, position 20) described above. In the position registration information, an item position in which the position name corresponding to the position information of the position 20 is recorded, an item camera in which the number of the camera 140 having the position information of the position is recorded, and a video of the position can be photographed. An item preset in which the monitoring position information of the set camera 140 is recorded is included.

  In addition, in the position registration information, the priority order of the camera 140 that photographs the position 20 can be added, the photographing importance for each position can be added, and the monitoring range (for example, the position 20 together with the position 20) Information for each camera 140 in the horizontal direction (30 ° to 150 °, etc.) and monitoring video information when in the monitoring range can be added. By setting the monitoring range, when an image outside the monitoring range is sent from the camera 140, it can be followed up by another camera. An example of position registration information is shown in FIG. FIG. 3 is a diagram showing a specific example of position registration information in the embodiment of the present invention. In this figure, the position registration information includes item positions, item cameras, and item presets.

  Further, the storage unit 112 may record position information regarding a place where the camera 140 is installed.

  The cross point 113 actually switches the camera 140 that captures the position 20 based on an instruction from the control unit 111. When there are a plurality of monitors 130, the cross point may be switched between the monitors 130 based on an instruction from the control unit 111. In addition, when displaying a captured video or a recorded video on the monitor 130, the cross point is appropriately switched between the camera 140 and the recorder 150 based on an instruction from the control unit 111.

  The state monitoring unit 114 recognizes information such as position information regarding the position where the plurality of cameras 140 are currently photographing. Then, the state monitoring unit 114 records the recognized information as state monitoring information. The state monitoring information includes, as items, a position where a plurality of cameras 140 are currently photographed and a state where the camera 140 is in use. The in-use state refers to information such as a user who is currently using the camera 140 and an event. Events include alarm conditions. An example of the state monitoring information is shown in FIG. In addition, when the position to be photographed by each camera 140 and the in-use state is not specified, it is indicated by a hyphen “-” in the corresponding item of FIG.

  When starting to shoot video, the controller 120 selects which of the cameras 141, 142, and 143 to use for shooting the position 20. In addition, the controller 120 performs an operation to display a follow-up history on the monitor 130 in order to reproduce the recorded video that the user wants to check from the recorded video recorded by the recorder 150. Then, the controller 120 selects a recorded video to be confirmed from the follow-up history. An example of the follow-up history is shown in FIG.

  The monitor 130 displays a captured image currently captured by the camera 140, a recorded image recorded by the recorder 150, a follow-up history of the position 20, and the like. In the state in which the follow-up history is displayed, the controller 120 can select which follow-up history is reproduced from the one or more follow-up histories. An example of display by the monitor 130 is shown in the monitor 50 of FIG.

  Here, the plurality of cameras 140 are assumed to be analog cameras, have cameras 141, 142, 143,... And are connected to a video switching device 110 such as a matrix switcher via a coaxial cable. The number of cameras 140 need not be three, and may be more or less. The camera 140 captures an image of a position specified based on the position registration information recorded in the storage unit 112 according to an instruction from the control unit 111. Note that when it is not necessary to specifically follow each position based on the position registration information, the camera 140 need not specify the shooting direction and position, and is in a free state. Thereafter, when a specific shooting direction is instructed by the control unit 111, shooting at a specified position is started from that point.

  The recorder 150 records the video shot by the camera 140. When the recorded video that is actually recorded is played back, the history information selected by the controller 120 is delivered from the follow-up history recorded in the storage unit 112, and the monitor 130 searches and plays back based on the history information. The recorded video is displayed. As for the timing at which the recorder 150 performs recording, the recording may be started when the camera 140 is switched after the control unit 111 detects an abnormal state, or the video taken by the camera 140 is always recorded. It may be.

  Next, a description will be given of the camera system 100 in a case where an abnormal state occurs in the camera that is currently capturing the position 20 and another camera captures the position 20 thereafter. Here, it is assumed that the camera 141 is disconnected at 7:10 on January 3rd. FIG. 6 is an operation flowchart for video follow-up of the camera system 100 according to the embodiment of the present invention. Note that the position A in the position registration information stored in the storage unit 112 corresponds to the position 20.

  First, the video storage unit 112 records position registration information before starting to capture a video with the camera 140. (Step S501) When starting to shoot video, the controller 120 selects to use the camera 141 for shooting the position 20 as an initial setting. Further, as an initial selection of the camera, the control unit 111 may select based on the position registration information. For example, according to (1) described above as the camera selection method by the control unit 111, the camera 141 having the highest registration order among the positions A corresponding to the position 20 of the position registration information is selected, or the position registration information is It may be possible to select a camera with the highest priority among the registered positions A.

  When the initial selection is performed, the monitor 130 displays an image of the position 20 captured by the camera 141 (step S502). When the state monitoring unit 114 recognizes that the camera 141 is shooting the image of the position 20, the state monitoring unit 114 records that the camera 141 is currently shooting the image of the position 20 (step S503).

  Next, when the control unit 111 detects that an abnormal state has occurred in the camera 141 at 7:10 on January 3 (step S504), the position information of the position A is registered in the position registration information. Then, for example, using the camera selection methods (1) to (4), the camera that captures the image of the next position 20 is selected (step S505). Specifically, for example, when the method (1) is applied, of the cameras 141, 142, and 143 registered in the position A in the position registration information, the camera 142 registered next to the camera 141 is selected. When the control unit 111 designates as the next shooting camera and applies the method (2), the camera 142 that is a candidate for the next shooting camera registered in the state monitoring information recorded by the state monitoring unit 114. , 143, since the camera 142 is in an alarm state, the control unit 111 designates the camera 143 as the next photographing camera.

  When the next photographing camera is selected, the control unit 111 changes the photographing direction of the next photographing camera to the position 20 (step S506). In the following description, it is assumed that the camera 142 actually designated next is the camera 142. Subsequently, the cross point 113 switches the captured image displayed on the monitor 130 from the captured image captured by the camera 141 to the captured image captured by the camera 142 in accordance with an instruction from the control unit 111 (step S507). In this way, the monitor 130 can display the follow-up video (step S508).

  Next, the camera system 100 in the case of reproducing a recorded video in order to confirm the video of the position 20 recorded by the recorder 150 will be described. Here, it is assumed that a recorded video obtained by recording a video taken by the camera 142 at 7:10 on January 3 is reproduced. FIG. 7 is an operation flowchart for confirming the recorded video of the camera system 100 according to the embodiment of the present invention.

  First, when the controller 120 performs an operation, the control unit 111 displays the history of the position A on the monitor 130 (step S601). In the display by the monitor 130, for example, it is displayed in a format as in the monitor 50 of FIG. Then, the controller 120 records “1/3 7:10 camera 142”, “1/5 8:25 camera 143”, “2/10 19:42 camera 142” (follow-up in FIG. 5) in the history of position A. From the history), the previous history is selected, and the reproduction operation is executed (step S602).

  Next, in accordance with the input selection described above, the control unit 111 searches for and plays back the corresponding recording material in the recorder 150 under conditions such as “camera number: 142” and “recording start date / time: 1/3 7:10”. (Step S603). Subsequently, the cross point 113 causes the monitor 130 to display the recorded video according to an instruction from the control unit 111 (step S604). In this way, the monitor 130 can display a playback image of the follow-up video (step S605).

  According to the camera system 100 in the embodiment of the present invention as described above, the camera system 100 includes the video switching device 110 that switches the plurality of cameras 140 that shoot a predetermined shooting target, and the video switching device 110 includes: A storage unit 112 for recording position registration information including position information regarding a position of a specific imaging target included in a predetermined imaging target and camera information regarding a camera 140 that images the specific imaging target, and a follow-up history for each position; A photographed video receiver that sequentially receives a photographed video of a specific subject captured by the camera 140; a reception determination unit that determines whether the photographed video is sequentially received by the photographed video receiver; and a reception determiner If it is determined that the captured video of the camera 141 is not received sequentially, When the camera 141 cannot shoot a specific position 20 by using the cross point 113 for switching the camera that shoots a specific shooting target from the camera 141 based on the registered information. The position 20 can be photographed by another camera.

  INDUSTRIAL APPLICABILITY The present invention is useful for a video switching device, a camera system, and the like that can capture a position with another camera when a certain camera cannot capture a specific position.

The conceptual diagram at the time of image | photographing a certain position in embodiment of this invention with a some camera 1 is a block diagram of a camera system according to an embodiment of the present invention. The figure which showed the specific example of the position registration information in embodiment of this invention The figure which showed the specific example of the state monitoring information in embodiment of this invention The figure which showed the specific example of the follow-up history in embodiment of this invention Operation flow diagram when video follow-up of the camera system in the embodiment of the present invention is performed Operation flow diagram when confirming recorded video of camera system in embodiment of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Matrix switcher 20 Position 30, 30A, 30B, 30C Camera 40 Recorder 50 Monitor 60 Controller 100 Camera system 110 Image | video switching apparatus 111 Control part 112 Memory | storage part 113 Crosspoint 114 State monitoring part 120 Controller 130 Monitor 140, 141, 142, 143 Camera 150 recorder

Claims (10)

A video switching device that switches a plurality of cameras that shoot a predetermined shooting target,
A storage unit for recording position registration information including position information relating to a position of a specific photographing target included in the predetermined photographing target and camera information relating to a camera photographing the specific photographing target;
A photographic video receiver that sequentially receives the photographic video of the specific photographic subject imaged by the first camera;
A reception determination unit that determines whether or not the captured video is sequentially received by the captured video receiver;
A shooting camera switching unit that switches a camera for shooting the specific shooting target from the first camera based on the position registration information when the reception determination unit determines that the shot video is not sequentially received; A video switching device. The video switching device according to claim 1,
The photographing camera switching unit
The camera that shoots the specific shooting target is switched from the first camera to a second camera that is shooting a shooting target other than the specific shooting target at the time of determination by the reception determination unit, and the second camera A video switching device that directs the image to the position of the specific subject. The video switching device according to claim 1 or 2,
The photographing camera switching unit
A video switching device that switches the camera based on the order of the cameras registered in the position registration information for each specific photographing target. The video switching device according to claim 1 or 2,
A status monitoring unit that monitors the current usage status of the plurality of cameras and registers it as usage status information;
The photographing camera switching unit
A video switching device that switches the camera based on the use state information. The video switching device according to claim 1 or 2,
The storage unit
Having camera position information regarding the position of the camera;
The photographing camera switching unit
A video switching device for switching to a camera having the closest distance from the specific shooting target among the cameras registered in the position registration information for each specific shooting target based on the position registration information and the camera position information. The video switching device according to claim 1 or 2,
The storage unit
As the position registration information, it has a shooting importance for each specific shooting object,
The photographing camera switching unit
A video switching device that switches the camera based on the photographing importance. The video switching device according to claim 1 or 2,
The storage unit
The position registration information includes monitoring range information related to a monitoring range including the shooting target for each specific shooting target and monitoring video information related to a video in the monitoring range,
The reception determination unit
Based on the position registration information, it is determined whether the captured image captured by the captured image receiving unit is an image within the monitoring range,
The photographing camera switching unit
A video switching device that switches the camera when the reception determination unit determines that the captured video is not within the monitoring range. A camera system having a video switching device that switches a plurality of cameras that shoot a predetermined shooting target,
The video switching device is
A storage unit for recording position registration information including position information relating to a position of a specific photographing target included in the predetermined photographing target and camera information relating to a camera photographing the specific photographing target;
A photographic video receiver that sequentially receives the photographic video of the specific photographic subject imaged by the first camera;
A reception determination unit that determines whether or not the captured video is sequentially received by the captured video receiver;
A shooting camera switching unit that switches a camera for shooting the specific shooting target from the first camera based on the position registration information when the reception determination unit determines that the shot video is not sequentially received; Having a camera system. The camera system according to claim 8,
In a situation where video from the plurality of cameras is recorded on a recorder,
A history recording unit for recording a history including identification information of the camera that has performed the switching and information regarding the date and time of the switching;
A camera system comprising: a control unit that searches a recorded video of a specific camera and date and time for a recorder from information on the camera and date and time read from the history recording unit. A video switching method in which a plurality of cameras that shoot a predetermined shooting target are switched,
Position registration information including position information relating to a position of a specific photographing target included in the predetermined photographing target and camera information relating to a camera photographing the specific photographing target;
A step of sequentially receiving photographed images of the specific photographing object photographed by the first camera;
A reception determination step of determining whether or not the captured video is sequentially received by the captured video receiver;
A step of switching a camera that shoots the specific shooting target from the first camera based on the position registration information when it is determined that the captured video is not sequentially received in the reception determination step. Video switching method.

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