Patent Publication Number: US-2023143741-A1

Title: Remote monitoring system, apparatus, and method

Description:
TECHNICAL FIELD 
     The present disclosure relates to a remote monitoring system, an apparatus, a method, and a computer-readable medium. 
     BACKGROUND ART 
     In recent years, technologies relating to automated vehicles have been attracting attention. Automated driving is classified into a plurality of levels, level 1 at which a vehicle performs driving assistance to level 5 at which a vehicle travels in a completely autonomous manner. In a case where a vehicle travels in a completely autonomous manner, no driver needs to be in the vehicle. However, in a case where no driver is in the vehicle, if autonomous driving becomes unavailable, there is a possibility that the vehicle will remain at a standstill and will fail to move. In particular, in a case where an automated vehicle is made to travel without a driver, it is considered that remote monitoring of the vehicle is important. 
     As a related art, Patent Literature 1 discloses a monitoring apparatus that monitors a moving target. The monitoring apparatus described in Patent Literature 1 receives image data from an on-road camera installed in a parking lot, an intersection, or the like and a plurality of vehicles on which a camera is mounted. The monitoring apparatus obtains a position and a direction of movement of a target to be monitored, by using the on-road camera (a fixed camera). The monitoring apparatus selects a vehicle for monitoring the target to be monitored from among a plurality of vehicles on the basis of the position of the target to be monitored and a position of each of the vehicles. The monitoring apparatus monitors a specified target in a region to be monitored, by using image data obtained from a camera of the selected vehicle and the on-road camera. 
      As another related art, Patent Literature 2 discloses a remote operation system that remotely operates a vehicle. In the remote operation system described in Patent Literature 2, a camera is mounted on a vehicle, and the vehicle transmits a video captured by the camera to a remote operation apparatus. The remote operation apparatus includes a steering wheel, an accelerator pedal, a brake pedal, and the like. The remote operation apparatus displays the video received from the vehicle. A person who performs remote maneuvering operates the steering wheel or the like while viewing the video, and remotely drives the vehicle. Patent Literature 2 also describes that in a case where the vehicle is in a field of view of a fixed-point camera such as an on-road camera, the remote operation apparatus obtains a video from the fixed-point camera, and presents the video obtained from the fixed-point camera to a remote operator. 
     As yet another related art, Patent Literature 3 discloses a vehicle communication apparatus that is used in communication between a vehicle and a control center. In Patent Literature 3, the control center performs control to assist an automated vehicle in traveling. The vehicle includes cameras that image a front side, a rear side, a right-hand side, a left-hand side, and an interior of the vehicle. The vehicle communication apparatus transmits, to the control center, pieces of image data of front, rear, left-hand side, right-hand side, and in-vehicle cameras. 
     The vehicle communication apparatus specifies a situation of the vehicle by using information relating to the cameras. The vehicle communication apparatus determines priority orders of the front, rear, left-hand side, right-hand side, and in-vehicle cameras on the basis of the specified situation. The vehicle communication apparatus controls a resolution and a frame rate of image data of each of the cameras in accordance with the determined priority orders. For example, in a case where a camera that images a front side of the vehicle has a high priority order, the vehicle communication apparatus transmits, to the control center, image data of the camera that images the front side of the vehicle at a high resolution and a high frame rate. 
     Citation List 
     Patent Literature 
     
         
         Patent Literature 1: Japanese Unexamined Patent Application Publication No. 2017-216575 
         Patent Literature 2: International Patent Publication No. WO2018/087879 
         Patent Literature 3: Japanese Unexamined Patent Application Publication No. 2020-3934 
       
    
     SUMMARY OF INVENTION 
     Technical Problem 
     In Patent Literature 1, the monitoring apparatus obtains image data from a vehicle that can monitor a target to be monitored from among a plurality of vehicles, in accordance with a position of the target to be monitored and a position of each of the plurality of vehicles. In this case, if the number of vehicles from which image data is obtained increases, there is a possibility that a communication band of a wireless communication network to be used in data transmission between vehicles and the monitoring apparatus will be insufficient. In a case where a communication band of wireless communication is insufficient, the monitoring apparatus fails to obtain image data having high image quality, and the target to be monitored fails to be correctly monitored on a side of the monitoring apparatus in some cases. 
     In Patent Literature 2, a vehicle is remotely operated by using a video captured by a fixed-point camera. In this case, a volume of a video to be transmitted from the vehicle to the remote operation apparatus can be reduced. However, in a case where the video of the fixed-point camera and the video of the vehicle are transmitted through the same wireless communication network, there is a possibility that a communication band will be insufficient in the wireless communication network, and a situation of the vehicle fails to be correctly grasped on a side of the remote operation apparatus. 
     In Patent Literature 3, image data of a specified camera from among a plurality of cameras mounted on a vehicle is transmitted with high image quality to the control center in accordance with a vehicle situation. For example, at the time of turning left, pieces of image data of a front camera and a left-hand side camera are transmitted with high image quality to the control center, and therefore the control center can more reliably control the vehicle. However, in 
     Patent Literature 3, the vehicle communication apparatus controls the quality of a video of the local vehicle that will be transmitted from the vehicle to the control center. In Patent Literature 3, only the video of the local vehicle is used, and therefore in some cases, a peripheral situation of the vehicle fails to be precisely grasped. 
     In view of the circumstances described above, it is an object of the present disclosure to provide a remote monitoring system, an apparatus, a method, and a computer-readable medium that are capable of obtaining a video that enables a situation of a vehicle to be precisely grasped on a remote side even in a limited communication band. 
     Solution to Problem 
     In order to achieve the object described above, the present disclosure provides a remote monitoring system including: video reception means for obtaining a first video and a second video that are different in an imaging position from each other; important video determination means for determining a video having a higher degree of importance on the basis of the first video and the second video; video adjustment report means for transmitting a transmission video adjustment report that is used to adjust qualities of the first video and the second video in accordance with a result of determining a degree of importance; first video adjustment means for adjusting the first video on the basis of the transmission video adjustment report; and second video adjustment means for adjusting the second video on the basis of the transmission video adjustment report. 
     The present disclosure provides a remote monitoring apparatus including: video reception means for obtaining a first video and a second video that are different in an imaging position from each other; important video determination means for determining a video having a higher degree of importance on the basis of the first video and the second video; and video adjustment report means for transmitting a transmission video adjustment report to adjust qualities of the first video and the second video, the transmission video adjustment report being used to adjust the qualities of the first video and the second video on the basis of a result of determining a degree of importance. 
     The present disclosure provides a remote monitoring method including: obtaining a first video and a second video that are different in an imaging position from each other; determining a video having a higher degree of importance on the basis of the first video and the second video; and transmitting a transmission video adjustment report to adjust qualities of the first video and the second video, the transmission video adjustment report being used to adjust the qualities of the first video and the second video in accordance with a result of determining a degree of importance. 
     The present disclosure provides a non-transitory computer-readable medium configured to store a program that causes a computer to perform a process including: obtaining a first video and a second video that are different in an imaging position from each other; determining a video having a higher degree of importance on the basis of the first video and the second video; and transmitting a transmission video adjustment report to adjust qualities of the first video and the second video, the transmission video adjustment report being used to adjust the qualities of the first video and the second video in accordance with a result of determining a degree of importance. 
     Advantageous Effects of Invention 
     A remote monitoring system, an apparatus, a method, and a computer-readable medium according to the present disclosure can obtain a video that enables a situation of a vehicle to be precisely grasped on a remote side even in a limited communication band. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a block diagram schematically illustrating a remote monitoring system according to the present disclosure. 
         FIG.  2    is a flowchart schematically illustrating an operation procedure in the remote monitoring system according to the present disclosure. 
         FIG.  3    is a block diagram illustrating a remote monitoring system according to an example embodiment of the present disclosure. 
         FIG.  4    is a block diagram illustrating an example of a configuration of a communication device. 
         FIG.  5    is a block diagram illustrating an example of a configuration of a remote monitoring apparatus. 
         FIG.  6    is a diagram schematically illustrating a situation of an intersection in a certain phase. 
         FIG.  7    is a diagram schematically illustrating a situation of the intersection in another phase. 
         FIG.  8    is a flowchart illustrating an operation procedure in the remote monitoring system. 
         FIG.  9    is a block diagram illustrating an example of a configuration of a computer apparatus. 
     
    
    
     EXAMPLE EMBODIMENT 
     Prior to the description of an example embodiment of the present disclosure, an outline of the present disclosure is described.  FIG.  1    schematically illustrates a remote monitoring system according to the present disclosure. A remote monitoring system  10  includes video reception means  12 , important video determination means  13 , video adjustment report means  14 , first video adjustment means  15 , and second video adjustment means. 
     In the remote monitoring system  10 , the first video adjustment means  15  and the second video adjustment means  16  are disposed, for example, in a moving body such as an automobile, a bus, or a train, or an on-road facility such as a traffic light. The video reception means  12 , the important video determination means  13 , and the video adjustment report means  14  are disposed, for example, in a remote monitoring apparatus that remotely monitors a vehicle. 
     The moving body and the on-road facility in which the first video adjustment means  15  and the second video adjustment means  16  are disposed include an imaging device. The moving body and the on-road facility transmit a video captured by using the imaging device to the video reception means  12  via a network. The video reception means  12  receives the video from the vehicle, the on-road facility, and the like. The video reception means  12  obtains a first video and a second video that are different in an imaging position from each other. 
     The important video determination means  13  determines a video having a higher degree of importance on the basis of the first video and the second video. The video adjustment report means  14  transmits a transmission video adjustment report that is used to adjust the qualities of the first video and the second video in accordance with a result of determining a degree of importance. 
     The first video adjustment means  15  adjusts the quality of the first video on the basis of the transmission video adjustment report. The second video adjustment means  16  adjusts the quality of the second video on the basis of the transmission video adjustment report. To adjust quality means, for example, to adjust image quality, and means to adjust at least one of a compression ratio, a resolution, or a rate to adjust an amount of data. The video reception means  12  receives the first video and the second video in which quality has been adjusted. As an example of the adjustment of quality, it is conceivable that the video adjustment means increases the quality of an important region, or reduces the quality of a region other than the important region. Examples of increasing quality include an operation to increase a resolution of a video (sharpening), an operation to increase the number of frames, and other operations. 
       FIG.  2    schematically illustrates an operation procedure in the remote monitoring system  10 . The video reception means  12  obtains a first video and a second video that are different in an imaging position from each other (step A 1 ). The important video determination means  13  determines a video having a higher degree of importance on the basis of the first video and the second video (step A 2 ). The video adjustment report means  14  transmits a transmission video adjustment report that is used to adjust the qualities of the first video and the second video in accordance with a result of determining a degree of importance, and therefore the qualities of the first video and the second video are adjusted (step A 3 ). 
      In the present disclosure, the important video determination means  13  determines a video having a higher degree of importance. The video adjustment report means  14  generates and transmits a transmission video adjustment report in accordance with a result of determining a degree of importance. The first video adjustment means  15  and the second video adjustment means  16  respectively adjust the qualities of the first video and the second video on the basis of the transmission video adjustment report. By doing this, the video reception means  12  can receive a video having a quality that corresponds to a degree of importance of the video, and can obtain a video that enables a situation of a vehicle to be precisely grasped in a limited communication band. 
     An example embodiment of the present disclosure is described in detail below with reference to the drawings.  FIG.  3    illustrates a remote monitoring system according to an example embodiment of the present disclosure. A remote monitoring system  100  includes a remote monitoring apparatus  101 , a plurality of vehicles  200 , and a plurality of on-road facilities  250 . In the remote monitoring system  100 , the remote monitoring apparatus  101  performs communication with the vehicles  200  and the on-road facilities  250  via a network  102 . The network  102  includes a wireless communication network such as a fifth generation mobile communication system. 
     Each of the vehicles  200  and the on-road facilities  250  includes a camera. A single vehicle  200  and a single on-road facility  250  may include a plurality of cameras. The vehicle  200  is, for example, a vehicle that travels on the road, such as a private car, a taxi, or a bus. The on-road facility  250  is a facility that has been installed on the road, such as a traffic light, a traffic sign, or a street light. Each of the vehicles  200  and the on-road facilities  250  includes a communication device that transmits, to the remote monitoring apparatus  101 , a video captured by using the camera. The remote monitoring apparatus  101  receives the video from the vehicles  200  and the on-road facilities  250  via the network  102 . 
     Note that  FIG.  3    illustrates three vehicles  200  and two on-road facilities  250 , but the present example embodiment is not limited to this. In the present example embodiment, it is sufficient if the remote monitoring apparatus  101  can receive the video from two or more targets, and the number of vehicles  200  and the number of on-road facilities  250  are not particularly limited. For example, the remote monitoring apparatus  101  may receive the video from a single vehicle  200  and a single on-road facility  250 . Alternatively, the remote monitoring apparatus  101  may receive the video from a plurality of vehicles  200 , and may receive the video from a plurality of on-road facilities  250 . At least some of the plurality of vehicles  200  may be configured to be able to perform automated driving (autonomous driving). 
       FIG.  4    illustrates an example of a configuration of a communication device included in the vehicle  200  and the on-road facility  250 . The vehicle  200  and the on-road facility  250  include a communication device  300  and a camera  350 . The communication device  300  includes a distributed video adjustment unit  301 , a video transmission unit  302 , and an adjustment report reception unit  303 . Note that  FIG.  4    illustrates four cameras  350 , but the number of cameras  350  is not limited to four. It is sufficient if the vehicle  200  and the on-road facility  250  include at least a single camera  350 . 
     Each of the cameras  350  images an outside of the vehicle or the on-road facility, and outputs image data (a video) to the communication device  300 . In the vehicle, each of the cameras  350  images, for example, a front side, a rear side, a right-hand side, or a left-hand side of the vehicle. In the on-road facility such as a traffic light, each of the cameras  350  images an intersection in which the traffic light has been installed from a plurality of directions. The communication device  300  transmits a video captured by using the camera  350  to the remote monitoring apparatus  101  via the network  102  (see  FIG.  3   ). 
     The distributed video adjustment unit  301  adjusts the qualities of videos captured by using the plurality of cameras  350 . Here, to adjust the quality of a video means to adjust, for example, at least some of a compression ratio, a resolution, or a frame rate of a video of each of the cameras  350 , and means to adjust an amount of data of a video to be transmitted to the remote monitoring apparatus  101  via the network  102 . As an example of the adjustment of quality, it is conceivable that the distributed video adjustment unit  301  increases the quality of an important region, or reduces the quality of a region other than the important region. Examples of increasing quality include an operation to increase a resolution of a video (sharpening), an operation to increase the number of frames, and other operations. The adjustment report reception unit  303  receives a transmission video adjustment report from the remote monitoring apparatus  101  via the network  102 . Determination of the transmission video adjustment report in the remote monitoring apparatus  101  will be described later. 
     In a case where the transmission video adjustment report has been received, the adjustment report reception unit  303  reports the transmission video adjustment report to the distributed video adjustment unit  301 . The distributed video adjustment unit  301  adjusts the quality of a video of each of the cameras  350  that will be transmitted to the remote monitoring apparatus  101 , on the basis of the transmission video adjustment report. For example, the distributed video adjustment unit  301  performs adjustment in such a way that the quality of a video that has been designated as a video having a higher degree of importance in the transmission video adjustment report is higher than the quality of another video. 
     The video transmission unit  302  transmits a video of each of the cameras  350  in which quality has been adjusted by the distributed video adjustment unit  301 , to the remote monitoring apparatus  101  via the network  102 . The video transmission unit  302  corresponds to the video transmission means  11  illustrated in  FIG.  1   , and the distributed video adjustment unit  301  corresponds to the first video adjustment means  15  or the second video adjustment means  16  that is illustrated in  FIG.  1   . 
     Note that in the present example embodiment, it is assumed that videos that are transmitted from the vehicle  200  and the on-road facility  250  to the remote monitoring apparatus  101  are two-dimensional camera images. However, the video is not particularly limited to a two-dimensional image, if a peripheral situation can be grasped. For example, a video transmitted from the vehicle  200  to the remote monitoring apparatus  101  can include a point cloud image that has been generated by using light detection and ranging (LiDAR) or the like. 
       FIG.  5    illustrates an example of a configuration of the remote monitoring apparatus  101 . The remote monitoring apparatus  101  includes a video reception unit  111 , a monitoring screen display unit  112 , an object detection unit  113 , an important video determination unit  114 , a video adjustment report unit  115 , and a position management DB  116 . In the position management DB  116 , positional information relating to an obtaining source (a camera) of each video is managed. The remote monitoring apparatus  101  obtains positional information, for example, from the vehicle  200 , and a position of each of the vehicles is managed in the position management DB  116 . Positional information relating to the on-road facility  250  is stored in the position management DB  116 , for example, by an administrator. Positional information may be obtained from the on-road facility  250 , and the positional information may be stored in the position management DB  116 . In the position management DB  116 , information relating to an imaging range of each of the cameras may be stored. 
     The video reception unit  111  receives, via the network  102  (see  FIG.  3   ), videos that have been transmitted from the vehicle  200  and the on-road facility  250 . The monitoring screen display unit  112  displays the video received by the video reception unit  111 . The video reception unit  111  receives, for example, a video captured by a camera of a vehicle  200  to be monitored and a video captured by a camera of a related object that relates to the vehicle to be monitored. The related object that relates to the vehicle to be monitored includes a vehicle other than the vehicle to be monitored, and the on-road facility. 
     The monitoring screen display unit  112  displays, on a display screen, for example, videos that have been imaged by using the cameras  350  (see  FIG.  4   ) mounted on the vehicle  200  to be monitored, and indicate a front side, a rear side, a right-hand side, and a left-hand side of the vehicle. In addition, the monitoring screen display unit  112  displays, on the display screen, videos that have been received from a vehicle  200  other than the vehicle to be monitored, and the on-road facility  250 . A monitoring person monitors the display screen to determine whether the traveling of the vehicle to be monitored will be hindered. 
      The object detection unit (object detection means)  113  detects an object included in the video. The object detection unit  113  detects, for example, a person, another vehicle, a fallen object on the road (an obstacle), or the like that is included in the video. The important video determination unit  114  determines a video having a higher degree of importance (an important video) from among videos received by the video reception unit  111 . The important video determination unit  114  determines the important video, for example, on the basis of a result of object detection performed by the object detection unit  113 . The important video determination unit  114  corresponds to the important video determination means  13  illustrated in  FIG.  1   . 
     The video adjustment report unit  115  generates a transmission video adjustment report for each of the videos, on the basis of a result of determination performed by the important video determination unit  114 . The transmission video adjustment report includes, for example, information that identifies each of the videos, and information that designates at least one of a compression ratio, a resolution, or a transmission period (a frame rate) of the video. The video adjustment report unit  115  generates a transmission video adjustment report that designates, for example, a higher resolution and a higher frame rate, for a video that has been determined to be an important video. The video adjustment report unit  115  generates a transmission video adjustment report that designates a lower resolution and a lower frame rate, for a video that has not been determined to be an important video. 
     The video adjustment report unit  115  transmits the transmission video adjustment report via the network to a vehicle  200  and an on-road facility  250  that serve as a video transmission source. In the vehicle  200  and the on-road facility  250 , the adjustment report reception unit  303  (see  FIG.  4   ) of the communication device  300  receives the transmission video adjustment report. The distributed video adjustment unit  301  adjusts a resolution, a transmission period, and the like of a video of each of the cameras  350  in accordance with the transmission video adjustment report. The distributed video adjustment unit  301  adjusts the qualities of the videos on the basis of the transmission video adjustment report in such a way that the image quality of a video that has been determined to be an important video is higher than the image quality of a video that has not been determined to be an important video. 
     For example, in a case where the object detection unit  113  has detected an object, the important video determination unit  114  may determine that a video in which the object has been detected is an important video, and may determine that another video is not an important video.  FIG.  6    schematically illustrates a situation of an intersection in which a plurality of cameras has been installed, in a certain phase. In the example of  FIG.  6   , in an intersection in which two roads cross each other, four cameras  350 - 1  to  350 - 4  that are different in an imaging direction from each other have been installed. In the situation illustrated in  FIG.  6   , in a video captured by the camera  350 - 1 , neither persons nor vehicles have been detected. In contrast, in a video captured by the camera  350 - 3 , a person and a vehicle have been detected. In this case, the important video determination unit  114  determines that the video of the camera  350 - 3  is a video that is more important than the video of the camera  350 - 1 . The video adjustment report unit  115  designates a higher resolution and a higher frame rate for the camera  350 - 3 , in the transmission video adjustment report. The video adjustment report unit  115  designates a lower resolution and a lower frame rate for the camera  350 - 1 , in the transmission video adjustment report. The distributed video adjustment unit  301  adjusts the quality of each of the videos on the basis of such a transmission video adjustment report in such a way that the quality of the video of the camera  350 - 3  is higher than the quality of the video of the camera  350 - 1 . 
     In a case where an object has been detected, the important video determination unit  114  may estimate a direction of movement of the object. The important video determination unit  114  may refer to the position management DB  116 , may specify a camera having an imaging range that an estimated destination of movement of the object falls within, may determine that a video of the camera is an important video, and may determine that another video is not an important video. For example, in the situation illustrated in  FIG.  6   , the important video determination unit  114  estimates that a person that has been detected in the video of the camera  350 - 2  will cross the intersection, and will move to an imaging range of the camera  350 - 4 . In this case, the important video determination unit  114  determines that a video of the camera  350 - 4  is a video that is more important than a video of the camera  350 - 2 . The video adjustment report unit  115  designates a higher resolution and a higher frame rate for the camera  350 - 4 , in the transmission video adjustment report. The video adjustment report unit  115  designates a lower resolution and a lower frame rate for the camera  350 - 2 , in the transmission video adjustment report. The distributed video adjustment unit  301  adjusts the quality of each of the videos on the basis of such a transmission video adjustment report in such a way that the quality of the video of the camera  350 - 4  is higher than the quality of the video of the camera  350 - 2 . 
     The important video determination unit  114  may analyze a traffic state on the basis of videos received by the video reception unit  111  and a position indicated in each of the videos, and may determine an important video on the basis of a result of analysis. The important video determination unit  114  analyzes, for example, a risky traffic state, such as rushing out to the road of a person, crossing of a person in a place other than the crosswalk, a construction site, or congestion of persons or vehicles, in a specified position. The important video determination unit  114  may determine that a video used to analyze a risky traffic state around a current location of a vehicle  200  to be monitored or on an expected traveling route is an important video. In this case, the video adjustment report unit  115  designates a higher resolution and a higher frame rate for the video used to analyze the risky traffic state, in the transmission video adjustment report. The distributed video adjustment unit  301  adjusts the quality of each of the videos on the basis of the transmission video adjustment report in such a way that the quality of the video used to analyze the risky traffic state is higher than the quality of another video. 
     The important video determination unit  114  may determine whether a plurality of vehicles is traveling in a platoon. Whether a plurality of vehicles is traveling in a platoon can be determined on the basis of, for example, videos of the plurality of vehicles and pieces of positional information of the plurality of vehicles. For example, the position management DB  116  manages information indicating relevance among cameras of the plurality of vehicles, for example, information indicating which vehicles are traveling in a platoon. The important video determination unit  114  may refer to the position management DB  116 , and may recognize the plurality of vehicles that are traveling in a platoon. 
     In a case where it has been determined that a plurality of vehicles is traveling in a platoon, the important video determination unit  114  may determine an important video in accordance with a position in a platoon of each of the vehicles that are traveling in a platoon. For example, the important video determination unit  114  determines that a video indicating a front side of a vehicle that is traveling at the head of the platoon and a video indicating a rear side of a vehicle that is traveling in the end of the platoon are important videos. In addition, the important video determination unit  114  determines that videos indicating left-hand and right-hand sides of each of the vehicles in the middle of the platoon (vehicles other than the vehicles located at the head and in the end of the platoon) are important videos. In a case where a plurality of vehicles is traveling in a platoon, the monitoring screen display unit  112  may display videos in a platoon units rather than in vehicle units. The monitoring screen display unit  112  may display, for example, a video indicating a front side of a vehicle that is traveling at the head of the platoon and a video indicating a rear side of a vehicle that is traveling in the end of the platoon as videos indicating front and rear sides of the platoon. In addition, the monitoring screen display unit  112  may display videos indicating left-hand and right-hand sides of a vehicle in the middle of the platoon as videos indicating left-hand and right-hand sides of the platoon. 
     The important video determination unit  114  may determine whether a vehicle to be monitored will pass another vehicle. Alternatively, the important video determination unit  114  may determine whether a vehicle to be monitored will be passed by another vehicle. Passing can be determined on the basis of at least one of a video of a vehicle that will pass another vehicle or a video of the other vehicle that will be passed by the vehicle. Alternatively, passing can be determined according to a positional relationship between vehicles. The important video determination unit  114  may determine an important video in accordance with whether a vehicle to be monitored will pass another vehicle or will be passed by the other vehicle. 
     In a case where a vehicle to be monitored will pass another vehicle, the important video determination unit  114  determines that a video indicating a front side of the vehicle to be monitored is an important video. In this case, the video adjustment report unit  115  designates a higher resolution and a higher frame rate for a video of a camera that images the front side of the vehicle to be monitored, in the transmission video adjustment report. The video adjustment report unit  115  designates a lower resolution and a lower frame rate for a video of another camera that images a rear side, a left-hand side, or a right-hand side of the vehicle to be monitored, in the transmission video adjustment report. The distributed video adjustment unit  301  adjusts the quality of each of the videos on the basis of such a transmission video adjustment report in such a way that the quality of the video of the camera that images the front side of the vehicle to be monitored is higher than the quality of a video of another camera. 
     In a case where a vehicle to be monitored will be passed by another vehicle, the important video determination unit  114  determines that a video indicating a rear side of the vehicle to be monitored is an important video. In this case, the video adjustment report unit  115  designates a higher resolution and a higher frame rate for a video of a camera that images the rear side of the vehicle to be monitored, in the transmission video adjustment report. The distributed video adjustment unit  301  adjusts the quality of each of the videos on the basis of the transmission video adjustment report in such a way that the quality of the video of the camera that images the rear side of the vehicle to be monitored is higher than the quality of a video of another camera. In addition, in a case where a video can be obtained from both a vehicle that will pass another vehicle and the other vehicle that will be passed by the vehicle, the video adjustment report unit  115  designates, for example, a higher resolution and a higher frame rate for a video indicating a front side of the vehicle that will pass the other vehicle, in the transmission video adjustment report. The video adjustment report unit  115  designates a lower resolution and a lower frame rate for a video indicating a front side of the other vehicle that will be passed by the vehicle, in the transmission video adjustment report. The distributed video adjustment unit  301  adjusts the quality of each of the videos on the basis of the transmission video adjustment report in such a way that the quality of the video indicating the front side of the vehicle that will pass the other vehicle is higher than the quality of the video indicating the front side of the other vehicle that will be passed by the vehicle. 
     In a case where a vehicle to be monitored will enter an intersection or the like, the important video determination unit  114  may determine that a video captured by an on-road facility  250  that has been installed near the intersection is an important video. For example, the video reception unit  111  receives a video from a vehicle  200  to be monitored and on-road facilities  250  that image a plurality of directions in an intersection. In a case where the vehicle  200  to be monitored will turn right at the intersection, the important video determination unit  114  may determine that a video that has been captured by an on-road facility  250  and indicates a road after turning right is an important video. 
       FIG.  7    schematically illustrates a situation of an intersection in which a plurality of cameras has been installed, in another phase. In this example, a vehicle will turn right at the intersection. In a case where the video reception unit  111  receives a video from a plurality of on-road facilities  250 , the important video determination unit  114  may determine that from among videos received from the plurality of on-road facilities  250 , a video indicating a traveling direction of a vehicle  200  to be monitored is an important video. In this case, the important video determination unit  114  determines that a video received from an on-road facility (the camera  350 - 2 ) that images the traveling direction of the vehicle is an important video. The video adjustment report unit  115  designates a higher resolution and a higher frame rate for the video of the camera  350 - 2 , in the transmission video adjustment report. The video adjustment report unit  115  designates a lower resolution and a lower frame rate for a video of the camera  350 - 4 , in the transmission video adjustment report. The distributed video adjustment unit  301  adjusts the quality of each of the videos on the basis of the transmission video adjustment report in such a way that the quality of the video of the camera  350 - 2  is higher than the quality of the video of the camera  350 - 4 . 
      The important video determination unit  114  may further determine important regions in respective videos received by the video reception unit  111  on the basis of the respective videos. The important video determination unit  114  may determine, for example, that a particularly important region in a video that has been determined to be an important video is an important region. The important video determination unit  114  may determine, for example, that a region of an object detected by the object detection unit  113  is an important region. Specifically, for example, in a case where there is a person in a video, the important video determination unit  114  may determine that a region of the person is an important region. The important video determination unit  114  may determine a plurality of important regions in a single video. In a case where the important video determination unit  114  has determined an important region, the video adjustment report unit  115  includes information that designates the important region in the transmission video adjustment report. In a case where the transmission video adjustment report includes the information that designates the important region, the distributed video adjustment unit  301  may adjust video quality in such a way that in a single video, quality in the important region is higher than quality in another region. 
     The video adjustment report unit  115  may select whether the transmission video adjustment report will need to be transmitted. In other words, a transmission video adjustment report relating to a video that has been determined to be an important video may be transmitted, and a transmission video adjustment report relating to a video that has not been determined to be an important video may not be transmitted. For example, in a case where the transmission video adjustment report has not been received, the distributed video adjustment unit  301  on a vehicle side adjusts the quality of each video to relatively low image quality. The video adjustment report unit  115  transmits a transmission video adjustment report relating to a video that has been determined to be an important video, that is, a video to be transmitted with high image quality. The distributed video adjustment unit  301  may adjust a video for which the transmission video adjustment report has been received in accordance with the transmission video adjustment report in such a way that a resolution of the video is increased, and a transmission period is decreased. The video adjustment report unit  115   corresponds to the video adjustment report means  14  illustrated in  FIG.  1   . 
     Before the important video determination unit  114  determines an important video, a monitoring person monitors a vehicle to be monitored by using a video having relatively low image quality. In a case where the important video determination unit  114  has determined an important video, the video reception unit  111  receives a video having relatively high image quality for the video that has been determined to be the important video. In this case, a monitoring person can monitor a clear video for the important video to determine whether the traveling of a vehicle to be monitored will be hindered. 
     Note that the remote monitoring apparatus  101  may remotely control the traveling of a vehicle to be monitored in addition to remotely monitoring the vehicle to be monitored. For example, the remote monitoring apparatus  101  may include a remote control unit, and the remote control unit may transmit, to a vehicle, a remote control command relating to, for example, the start of turning right, emergency stop, or the like. In a case where the vehicle has received the remote control command, the vehicle operates according to the command. Alternatively, the remote monitoring apparatus  101  may include equipment for remotely maneuvering a vehicle, such as a steering wheel, an accelerator pedal, or a brake pedal. The remote control unit may remotely drive a vehicle in accordance with an operation performed on a remote driving vehicle. The remote monitoring apparatus  101  may switch a driving mode of a vehicle that is being driven in an automated driving mode to a remote driving mode. Alternatively, the remote monitoring apparatus  101  may switch a driving mode of a vehicle that is being driven by a person to the automated driving mode or the remote driving mode. 
     Next, an operation procedure (a remote monitoring method) in the remote monitoring system  100  is described.  FIG.  8    illustrates the operation procedure in the remote monitoring system  100 . Each of the vehicles  200  and the on-road facilities  250  transmits a video captured by using the camera  350  (see  FIG.  4   ) to the remote monitoring apparatus  101  via the network  102 . The video reception unit  111  of the remote monitoring apparatus  101  collects videos from the vehicles  200  and the on-road facilities  250  (step B 1 ). 
     The object detection unit  113  performs object detection on each of the collected videos (step B 2 ). The important video determination unit  114  determines an important video on the basis of a result of object detection (step B 3 ). In step B 3 , the important video determination unit  114  determines that a video in which a predetermined object such as a person has been detected is an important video. Alternatively, the important video determination unit  114  may analyze a vehicle to be monitored and a traffic situation around the vehicle to be monitored by using a result of object detection, and may determine an important video on the basis of a result of analysis. The important video determination unit  114  may further determine an important region in the important video. 
     The video adjustment report unit  115  generates a transmission video adjustment report on the basis of a result of determining the important video. The video adjustment report unit  115  transmits the transmission video adjustment report to a vehicle  200  and an on-road facility  250  that serve as a transmission source of each of the videos (step B 4 ). In the communication device  300  (see  FIG.  4   ) of the vehicle  200  and the on-road facility  250 , the adjustment report reception unit  303  receives the transmission video adjustment report. The distributed video adjustment unit  301  adjusts the image quality of a video obtained from each of the cameras  350  on the basis of the transmission video adjustment report received by the adjustment report reception unit  303  (step B 5 ). The video transmission unit  302  transmits, to the remote monitoring apparatus  101 , a video in which image quality has been adjusted. 
     In the present example embodiment, in the remote monitoring apparatus  101 , the important video determination unit  114  determines an important video from among a plurality of videos received from the vehicles  200  and the on-road facilities  250 . The video adjustment report unit  115  controls the distributed video adjustment unit  301  on a video transmission side in such a way that the image quality of a video that has been determined to be the important video is higher than the image quality of another video. By doing this, the video reception unit  111  can receive a video in which quality has been adjusted in such a way that an important region has high image quality. The remote monitoring apparatus  101  according to the present example embodiment can receive a video having an image quality that corresponds to a degree of importance of the video, and can obtain a video that enables a situation of a vehicle to be monitored to be precisely grasped even in a limited communication band. 
     Note that, in the present disclosure, the remote monitoring apparatus  101  can be configured as a computer apparatus (a server apparatus).  FIG.  9    illustrates an example of a configuration of a computer apparatus that can be used as the remote monitoring apparatus  101 . A computer apparatus  500  includes a control unit (a central processing unit (CPU))  510 , a storage unit  520 , a read only memory (ROM)  530 , a random access memory (RAM)  540 , a communication interface (IF)  550 , and a user interface  560 . 
     The communication interface  550  is an interface for connecting the computer apparatus  500  to a communication network by using wired communication means, wireless communication means, or the like. The user interface  560  includes, for example, a display unit such as a display. In addition, the user interface  560  includes an input unit such as a keyboard, a mouse, or a touch panel. 
     The storage unit  520  is an auxiliary storage device that can hold various types of data. The storage unit  520  does not necessarily need to be part of the computer apparatus  500 , and may be an external storage device or a cloud storage connected to the computer apparatus  500  via a network. 
     The ROM  530  is a non-volatile storage device. As the ROM  530 , for example, a semiconductor storage device, such as a flash memory, that has a relatively small capacity is used. A program executed by the CPU  510  can be stored in the storage unit  520  or the ROM  530 . The storage unit  520  or the ROM  530  stores, for example, various programs for implementing a function of each unit in the remote monitoring apparatus  101 . 
     The program described above can be stored by using various non-transitory computer-readable media, and can be supplied to the computer apparatus  500 . The non-transitory computer-readable media include various tangible storage media. Examples of the non-transitory computer-readable medium include a magnetic recording medium such as a flexible disk, a magnetic tape, or a hard disk, a magneto-optical recording medium such as a magneto-optical disk, an optical disk medium such as a compact disc (CD) or a digital versatile disk (DVD), and a semiconductor memory such as a mask ROM, a programmable ROM (PROM), an erasable PROM (EPROM), a flash ROM, or a RAM. In addition, the program may be supplied to a computer by using various transitory computer-readable media. Examples of the transitory computer-readable medium include an electrical signal, an optical signal, and electromagnetic waves. The transitory computer-readable medium can supply the program to a computer via a wired communication line such as an electric wire or an optical fiber, or a wireless communication line. 
     The RAM  540  is a volatile storage device. As the RAM  540 , various semiconductor memory devices, such as a dynamic random access memory (DRAM) or a static random access memory (SRAM), are used. The RAM  540  can be used as an internal buffer that transitorily stores data or the like. The CPU  510  deploys a program stored in the storage unit  520  or the ROM  530  in the RAM  540 , and executes the deployed program. The CPU  510  executes the program, and therefore a function of each of the units in the remote monitoring apparatus  101  can be implemented. The CPU  510  may include an internal buffer in which data or the like can be transitorily stored. 
     An example embodiment of the present disclosure has been described in detail above. However, the present disclosure is not limited to the example embodiment described above, and the present disclosure also includes those that are obtained by making changes or modifications to the example embodiment described above without departing from the spirit of the present disclosure. 
     For example, all or some of the example embodiments disclosed above can be described like in, but not limited to, the following supplementary notes. 
     Supplementary Note 1 
     A remote monitoring system including:
     video reception means for obtaining a first video and a second video that are different in an imaging position from each other;   important video determination means for determining a video having a higher degree of importance on the basis of the first video and the second video;   video adjustment report means for transmitting a transmission video adjustment report that is used to adjust qualities of the first video and the second video in accordance with a result of determining a degree of importance;   first video adjustment means for adjusting the first video on the basis of the transmission video adjustment report; and   second video adjustment means for adjusting the second video on the basis of the transmission video adjustment report.   

     Supplementary Note 2 
     The remote monitoring system according to Supplementary Note 1, in which the video adjustment report means controls the first video adjustment means and the second video adjustment means on the basis of the transmission video adjustment report to cause a video that has been determined to be the video having the higher degree of importance to have an image quality that is higher than an image quality of a video that has not been determined to be the video having the higher degree of importance. 
     Supplementary Note 3 
     The remote monitoring system according to Supplementary Note 1 or 2, in which the first video and the second video include at least one of a video obtained in a vehicle to be monitored or a video obtained in a related object relating to the vehicle to be monitored. 
     Supplementary Note 4 
     The remote monitoring system according to any one of Supplementary Notes 1 to 3, in which
     the important video determination means further determines an important region in each video received by the video reception means on the basis of each of the videos, and   the video adjustment report means includes information that designates the important region in the transmission video adjustment report.   

     Supplementary Note 5 
     The remote monitoring system according to any one of Supplementary Notes 1 to 4, further including object detection means for performing object detection on a video received by the video reception means, 
     in which the important video determination means determines the video having the higher degree of importance on the basis of a result of the object detection performed by the object detection means. 
     Supplementary Note 6 
     The remote monitoring system according to Supplementary Note 5, in which the important video determination means estimates a destination of movement of an object that has been detected, and determines that a video having an imaging range that the destination of movement that has been estimated falls within is the video having the higher degree of importance. 
     Supplementary Note 7 
     The remote monitoring system according to any one of Supplementary Notes 1 to 4, in which the important video determination means analyzes a state of traffic on the basis of the first video, the second video, and a plurality of the imaging positions of the first video and the second video, and determines the video having the higher degree of importance on the basis of a result of analysis. 
     Supplementary Note 8 
     The remote monitoring system according to any one of Supplementary Notes 1 to 4, in which
     the video reception means receives a plurality of videos from a plurality of vehicles to be monitored, the plurality of videos being different in an imaging position from each other, and   in a case where the plurality of vehicles to be monitored is traveling in a platoon, the important video determination means determines the video having the higher degree of importance in accordance with a position in the platoon of each of the plurality of vehicles to be monitored that is traveling in the platoon.   

     Supplementary Note 9 
     The remote monitoring system according to Supplementary Note 8, in which the important video determination means determines that at least a video that indicates a front side of a vehicle that is traveling at a head of the platoon or a video that indicates a rear side of a vehicle that is traveling in an end of the platoon are a plurality of the videos having the higher degree of importance. 
     Supplementary Note 10 
     The remote monitoring system according to any one of Supplementary Notes 1 to 4, in which
     the video reception means receives one or more videos from respective one or more on-road facilities, and   the important video determination means determines that from among the one or more videos that have been received from the respective one or more on-road facilities, a video indicating a traveling direction of a vehicle to be monitored is the video having the higher degree of importance.   

     Supplementary Note 11 
     A remote monitoring apparatus including:
     video reception means for obtaining a first video and a second video that are different in an imaging position from each other;   important video determination means for determining a video having a higher degree of importance on the basis of the first video and the second video; and   video adjustment report means for transmitting a transmission video adjustment report to adjust qualities of the first video and the second video, the transmission video adjustment report being used to adjust the qualities of the first video and the second video on the basis of a result of determining a degree of importance.   

     Supplementary Note 12 
     The remote monitoring apparatus according to Supplementary Note 11, in which the video adjustment report means adjusts the qualities of the first video and the second video on the basis of the transmission video adjustment report to cause a video that has been determined to be the video having the higher degree of importance to have an image quality that is higher than an image quality of a video that has not been determined to be the video having the higher degree of importance. 
     Supplementary Note 13 
     The remote monitoring apparatus according to Supplementary Note 11 or 12, in which the first video and the second video include at least one of a video obtained in a vehicle to be monitored or a video obtained in a related object relating to the vehicle to be monitored. 
     Supplementary Note 14 
     The remote monitoring apparatus according to any one of Supplementary Notes 11 to 13, in which
     the important video determination means further determines an important region in each video received by the video reception means on the basis of each of the videos, and   the video adjustment report means includes information that designates the important region in the transmission video adjustment report.   

     Supplementary Note 15 
     A remote monitoring method including:
     obtaining a first video and a second video that are different in an imaging position from each other;   determining a video having a higher degree of importance on the basis of the first video and the second video; and   transmitting a transmission video adjustment report to adjust qualities of the first video and the second video, the transmission video adjustment report being used to adjust the qualities of the first video and the second video in accordance with a result of determining a degree of importance.   

     Supplementary Note 16 
     The remote monitoring method according to Supplementary Note 15, in which in adjusting the qualities of the first video and the second video, the qualities of the first video and the second video are adjusted on the basis of the transmission video adjustment report to cause a video that has been determined to be the video having the higher degree of importance to have an image quality that is higher than an image quality of a video that has not been determined to be the video having the higher degree of importance. 
     Supplementary Note 17 
     The remote monitoring method according to Supplementary Note 15 or 16, in which the first video and the second video include at least one of a video obtained in a vehicle to be monitored or a video obtained in a related object relating to the vehicle to be monitored. 
     Supplementary Note 18 
     The remote monitoring method according to any one of Supplementary Notes 15 to 17, further including further determining an important region in each video on the basis of the first video and the second video, 
     generating the transmission video adjustment report includes including information that designates the important region in the transmission video adjustment report. 
     Supplementary Note 19 
     A non-transitory computer-readable medium configured to store a program that causes a computer to perform a process including:
     obtaining a first video and a second video that are different in an imaging position from each other;   determining a video having a higher degree of importance on the basis of the first video and the second video; and   transmitting a transmission video adjustment report to adjust qualities of the first video and the second video, the transmission video adjustment report being used to adjust the qualities of the first video and the second video in accordance with a result of determining a degree of importance.   

     Reference Signs List 
     
         
           10  REMOTE MONITORING SYSTEM 
           12  VIDEO RECEPTION MEANS 
           13  IMPORTANT VIDEO DETERMINATION MEANS 
           14  VIDEO ADJUSTMENT REPORT MEANS 
           15  FIRST VIDEO ADJUSTMENT MEANS 
           16  SECOND VIDEO ADJUSTMENT MEANS 
           100  REMOTE MONITORING SYSTEM 
           101  REMOTE MONITORING APPARATUS 
           102  NETWORK 
           111  VIDEO RECEPTION UNIT 
           112  MONITORING SCREEN DISPLAY UNIT 
           113  OBJECT DETECTION UNIT 
           114  IMPORTANT VIDEO DETERMINATION UNIT 
           115  VIDEO ADJUSTMENT REPORT UNIT 
           200  VEHICLE 
           250  ON-ROAD FACILITY 
           300  COMMUNICATION DEVICE 
           301  DISTRIBUTED VIDEO ADJUSTMENT UNIT 
           302  VIDEO TRANSMISSION UNIT 
           303  ADJUSTMENT REPORT RECEPTION UNIT 
           350  CAMERA