JP2006259833A - Signal control system and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a signal control system capable of substantially reducing occurrence of traffic congestion by deciding a proper signal control parameter while considering traffic density of every branch direction such as right-turn, left-turn and straight of vehicles at an intersection. <P>SOLUTION: A traffic density measuring device 2 measures the traffic density of the vehicles at the intersection for every branch direction. A signal control device 1 calculates a green signal time utilization rate on the basis of the traffic density measured by the traffic density measuring device for every branch direction. The signal control device 1 determines the signal control parameter on the basis of the calculated green signal time utilization rate. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a signal control system for controlling a signal lamp installed at an intersection of a road network, and more particularly to a signal control system for controlling a signal lamp in consideration of a traffic volume according to a branching direction such as a right turn, a left turn, or a straight line at an intersection. And a signal control method.

  Conventionally, signal lamps installed at intersections in a road network are controlled by signal control parameters determined based on the amount of traffic flowing into the intersection. The amount of traffic flowing into the intersection is predicted from the number of passing vehicles measured by measuring the number of vehicles (passing vehicles) passed by a vehicle detector installed on the road connecting the intersections, for example. The vehicle detector includes an image type that senses a vehicle by processing an image captured by a CCD camera, an ultrasonic type that senses a vehicle by an ultrasonic sensor, an optical type that senses a vehicle by an optical sensor, and the like. The signal control method includes a centralized control method that determines signal control parameters at each intersection in the target area at the center and an autonomous distributed method that determines signal control parameters independently at each intersection. The signal control parameters determined in the centralized control method are cycle, split, and offset, and the signal control parameters determined in the autonomous distributed method are cycle and split. Further, even in the autonomous distributed system, when there is an adjacent signal control device (device for controlling a signal lamp at an adjacent intersection), an offset is also determined as a signal control parameter. The cycle is the time of one cycle of the signal lamp (the time from the start of the blue display to the start of the next blue display), the split is the ratio of the blue time in one cycle, and the offset is the cycle between the intersections It is the difference in start timing (relative offset) or the difference in cycle start timing from the reference intersection (absolute offset).

For example, Patent Documents 1 to 3 propose signal control systems that optimize cycles and splits in signal control parameters and suppress the occurrence of traffic jams.
JP 2003-331385 A Japanese Patent Laid-Open No. 2003-77091 Japanese Patent Laid-Open No. 7-141589

However, in general, the standard value of the saturated traffic flow rate for each straight turn at the intersection is
It is considered that straight ahead reference value> right turn reference value> left turn reference value. The saturated traffic flow rate is the maximum number of vehicles that can flow out per unit time at an intersection. Specifically, when turning to the right or left, the vehicle speed decreases, and even when the pedestrian crosses, the vehicle stops temporarily (when turning left or right), or when the oncoming straight vehicle travels (only when turning right) Therefore, as described above, it is considered that the straight traffic vehicle has the largest saturated traffic flow rate at the intersection, and the right turn vehicle and the left turn vehicle become smaller in this order. For this reason, even if the inflow traffic to the intersection is the same, the appropriate signal control parameter differs depending on whether there are many right-turn vehicles or left-turn vehicles. Specifically, as the ratio of right-turn vehicles and left-turn vehicles increases, the blue hours increase, or at intersections where the ratio of right-turn vehicles is large (intersections where right-turn arrows are introduced) There is a need to. As described above, the signal control parameter must be determined in consideration of not only the inflow traffic volume to the intersection but also the ratio of the right turn vehicle and the left turn vehicle in the inflow traffic volume.

  In addition, it is necessary to consider introduction of a right turn arrow at an intersection where a right turn arrow is not introduced and there are many right turn vehicles.

  On the other hand, the conventional signal control system proposed in Patent Documents 1 to 3 determines signal control parameters without considering the traffic volume according to the branch direction such as right turn, left turn, and straight ahead of the vehicle at the intersection. Yes. Therefore, if the inflow traffic to the intersection is the same, the signal control parameters determined regardless of the right turn vehicle or the left turn vehicle are the same. In other words, the signal control parameters could not be properly determined in real time according to the traffic volume according to the branch direction such as right turn, left turn, and straight ahead of the vehicle at the intersection. For this reason, there has been a problem that it is not possible to control the signal lamp that sufficiently suppresses the occurrence of traffic jams and makes the vehicle run smoothly.

  The object of the present invention is to determine the appropriate signal control parameters in consideration of the traffic volume for each branching direction, such as right turn, left turn, straight ahead, etc. of the vehicle at the intersection, thereby sufficiently suppressing the occurrence of traffic jams. Is to provide a signal control system and a signal control method capable of smoothly running the vehicle.

  The signal control system of the present invention has the following configuration in order to solve the above problems.

(1) A traffic measuring device having a measuring unit for each branch direction that captures a vehicle passing through an intersection with a camera and measures the number of vehicles that have passed through the intersection from the captured image for each branch direction;
A signal control parameter for determining a signal control parameter for controlling a signal lamp installed at this intersection, using the number of vehicles for each branch direction at the intersection, measured by the branch direction measuring means of the traffic measuring device. A determination means;
A signal control device having signal lamp control means for controlling the signal lamp based on the signal control parameter determined by the signal control parameter determination means.

  In this configuration, the traffic volume measuring device measures the number of vehicles that have passed through the intersection for each branch direction. Further, in the signal control device, the signal control parameter determining means determines the signal control parameter using the number of vehicles passing through the intersection measured for each branch direction, and the signal lamp control means is determined by the signal control parameter determined here. Control signal lights.

  Therefore, the signal control parameters can be determined in consideration of the traffic volume for each branch direction, such as right turn, left turn, and straight ahead of the vehicle at the intersection, and it is possible to sufficiently suppress the occurrence of traffic jams and to make the vehicle run smoothly. You can control the signal lamp. In addition, by measuring the traffic volume for each branch direction in the traffic measurement device and determining the signal control parameters using this measured traffic volume for each branch direction, the traffic volume for each branch direction can be determined. Appropriate signal control can be performed in real time.

  In addition, since the signal control parameter determining means is provided in the signal control device, signal control by the autonomous distributed method can be performed.

(2) A traffic volume measuring apparatus having a branch direction measuring means for capturing a vehicle passing through an intersection with a camera and measuring the number of vehicles passing through the intersection from the captured image for each branch direction;
A signal control parameter for determining a signal control parameter for controlling a signal lamp installed at this intersection, using the number of vehicles for each branch direction at the intersection, measured by the branch direction measuring means of the traffic measuring device. A central device with a determining means;
And a signal control device having signal lamp control means for controlling the signal lamp based on the signal control parameter determined by the signal control parameter determination means of the central device.

  In this configuration, the signal control parameter determining means provided in the signal control device in (1) is provided in the central device, the central device determines the signal control parameter, and the signal control parameter determined here is supplied to the signal control device. It is a composition to convey. In this configuration, the signal control at the intersection where the signal control method is the centralized control method is performed in consideration of the traffic volume according to the branching direction, such as right turn, left turn, and straight ahead of the vehicle at the intersection, as in (1) above. The control parameter can be determined, and the occurrence of a traffic jam can be sufficiently suppressed, and an appropriate signal light device that makes the vehicle run smoothly can be controlled. In addition, by measuring the traffic volume for each branch direction in the traffic measurement device and determining the signal control parameters using this measured traffic volume for each branch direction, the traffic volume for each branch direction can be determined. Appropriate signal control can be performed in real time.

(3) Frame image storage means for capturing a vehicle passing through the intersection with a camera, and storing frame images captured by the camera in time series;
Vehicle labeling means for extracting a vehicle imaged from the frame image stored in time series in the frame image storage means and assigning an ID to each extracted vehicle;
Using a plurality of temporally continuous frame images, a movement vector detection means for obtaining a movement vector for each vehicle to which an ID is given by the vehicle labeling means;
The ID assigned by the vehicle labeling means and the movement vector detected by the movement vector detection means are registered in a table for each preset divided area and for each frame image, and pass through the intersection using the table. A traffic volume measuring device having a measuring means for each branch direction for measuring the number of vehicles by the branch direction,
A signal control parameter for determining a signal control parameter for controlling a signal lamp installed at this intersection, using the number of vehicles for each branch direction at the intersection, measured by the branch direction measuring means of the traffic measuring device. A determination means;
A signal control device having signal lamp control means for controlling the signal lamp based on the signal control parameter determined by the signal control parameter determination means.

  In this configuration, the traffic volume measuring device in (1) is configured as described above. In the traffic volume measuring apparatus having this configuration, the frame images of the intersection captured by the camera are stored in the frame image storage means in time series. The camera is installed so that the entire intersection can be imaged. It is desirable to use a wide-angle camera that can capture the entire intersection even when installed at a relatively low position. The vehicle labeling means extracts a vehicle imaged for each frame image stored in the frame image storage means, and assigns an ID to each extracted vehicle. Further, the movement vector detecting means obtains a movement vector for each vehicle to which the ID is assigned. The movement vector is obtained from a plurality of images that are temporally continuous. Further, for each frame image, the branch direction measuring means creates a table in which the vehicle ID and the movement vector extracted from the frame image are registered in association with the divided area of the intersection where the vehicle is located. Then, the branching direction measuring means refers to this table, and for each vehicle to which an ID is given, tracks which segment of the intersection the vehicle has moved to branch the number of vehicles that have passed the intersection. Measure by direction.

  In addition, the same effect as the above (1) is obtained.

(4) Frame image storage means for capturing a vehicle passing through the intersection with a camera, and storing frame images captured by the camera in time series;
Vehicle labeling means for extracting a vehicle imaged from the frame image stored in time series in the frame image storage means and assigning an ID to each extracted vehicle;
Using a plurality of temporally continuous frame images, a movement vector detection means for obtaining a movement vector for each vehicle to which an ID is given by the vehicle labeling means;
The ID assigned by the vehicle labeling means and the movement vector detected by the movement vector detection means are registered in a table for each preset divided area and for each frame image, and pass through the intersection using the table. A traffic volume measuring device having a measuring means for each branch direction for measuring the number of vehicles by the branch direction,
A signal control parameter for determining a signal control parameter for controlling a signal lamp installed at this intersection, using the number of vehicles for each branch direction at the intersection, measured by the branch direction measuring means of the traffic measuring device. A central device having a determining means;
A signal control device having signal lamp control means for controlling the signal lamp based on the signal control parameter determined by the signal control parameter determination means of the central device.

  In this configuration, the traffic volume measuring device in (2) is the same as that in (3), and the same effect as in (2) is achieved.

  (5) The signal control parameter determination means of the signal control device calculates the blue time utilization rate of each indication for each branch direction, and uses the calculated blue time utilization rate for each branch direction. Means for determining the signal control parameter;

  In this configuration, since the signal control parameter is determined using the green time utilization rate for each branch direction shown, it is possible to control the signal lamp while suppressing the waste blue time.

  In addition, the present indication is a traffic flow to which the right of traffic is given by a signal lamp. Further, the green hour utilization rate is an amount indicating the utilization efficiency of effective blue hours, and is calculated by the actual number of outflows / number of outflowable units. The actual number of spills is a measured value, and the number of spills that can be spilled is calculated as saturated traffic flow rate x blue hour.

  (6) The signal control parameter determining means of the signal control device determines the signal control parameter by setting the blue time utilization rate in the branch direction that was maximum for each display as the present blue time utilization rate. Means.

  In this configuration, for example, in a display with many left turn vehicles, the blue hour utilization rate of the present turn is set as the blue hour utilization rate of the left turn vehicle, and the signal control parameter is determined. The saturation traffic flow rate is set for each branch direction. Therefore, it is possible to determine the signal control parameter using the appropriate green time utilization rate of each display, and it is possible to control the signal lamp with further reduced waste time.

  (7) The signal control parameter determining means of the signal control device determines the signal control parameter including the indication of the right turn arrow.

  In this configuration, it is possible to control the signal lamp at the intersection with the right turn arrow.

  According to the present invention, it is possible to determine the appropriate signal control parameters in consideration of the traffic volume by the branch direction in real time, such as right turn, left turn, straight ahead of the vehicle at the intersection, sufficiently suppress the occurrence of traffic congestion, It is possible to control the signal lamp that makes the vehicle run smoothly.

  Further, since the signal control parameter is determined using the green time utilization rate for each branch direction shown, it is possible to appropriately control the signal lamp under the blue time while suppressing the waste time.

Hereinafter, a signal control system according to an embodiment of the present invention will be described. First, an embodiment in which the present invention is applied to an autonomous distributed signal control system will be described.

  FIG. 1 is a diagram showing a configuration of a signal control system according to an embodiment of the present invention. The signal control system of this embodiment uses a signal control device 1 that controls a signal lamp 5 installed at an intersection and a captured image of the intersection captured by a camera 6 to determine the number of passing vehicles at the intersection in the branch direction. A traffic volume measuring device 2 for measuring separately and a central device 3 for monitoring traffic conditions at intersections and roads in the target area are provided. In this embodiment, the signal control device 1 determines a signal control parameter for controlling the signal lamp 5. The signal control device 1 and the traffic volume measuring device 2 are installed on the road side of the intersection, and the central device 3 is installed in the center. The signal control device 1 determines a signal control parameter for controlling one or a plurality of signal lamps 5 installed at an intersection. The traffic volume measuring device 2 measures the number of vehicles that have passed through the intersection for each branch direction such as a right turn vehicle, a left turn vehicle, and a straight traveling vehicle, and transmits the measurement result to the signal control device 1. The signal control device 1 and the traffic volume measuring device 2 are connected by a data communication line. The signal control device 1 at each intersection is connected to the central device 3 through a data communication line. The central device 3 acquires the number of passing vehicles for each branch direction measured by the traffic measuring device 2 for each intersection in the target area via the signal control device 1 and monitors the traffic situation in the target area. . The camera 6 is a so-called wide-angle camera, and is configured so that the entire inside of the intersection can be imaged even when installed at a relatively low position, for example, at a height of 5 to 8 m from the road surface. Specifically, a super-wide-angle lens with a focal length of 2 mm is built in, and the viewing angle exceeds 90 °. The camera 6 is a camera with a high dynamic range (120 dB or more) that can obtain a captured image with contrast even under imaging conditions where backlighting, shadows of buildings, footbridges, trees, and the like are generated.

  FIG. 2 is a block diagram showing the configuration of the signal control apparatus in the autonomous distributed signal control system of this embodiment. The signal control device 1 includes a first communication unit 11 that performs communication with the traffic measurement device 2 and a branch direction that cumulatively stores the number of passing vehicles according to the branch direction at the intersection measured by the traffic measurement device 2. A separate traffic storage unit 12, a statistical processing unit 13 that statistically processes the number of passing vehicles by branch direction at intersections stored cumulatively in the branch direction traffic storage unit 12, and a statistical processing unit 13 A signal control parameter determination unit 14 for determining a signal control parameter for controlling the signal lamp 5 using the processing result, and a signal lamp control unit for controlling the signal lamp 5 based on the signal control parameter determined by the signal control parameter determination unit 14 15 and a second communication unit 16 that controls communication with the central device 3. The first communication unit 11 receives the number of passing vehicles for each branch direction at the intersection transmitted from the traffic measuring device 2. About the reception interval of the number of passing vehicles by branch direction, in other words, the transmission interval at which the traffic measuring device 2 transmits the number of passing vehicles by branch direction to the signal control device 1, every 1 second, every 5 seconds Appropriate times such as every 1 cycle, every 1 minute, every 2.5 minutes, every 5 minutes, every 15 minutes, every 30 minutes, every hour, every 3 hours, etc. are set in advance. The traffic volume storage unit 12 for each branch direction stores the number of passing vehicles for each branch direction in the first receiving unit 11 at the same interval as the reception interval for the number of passing vehicles for each branch direction. The statistical processing unit 13 aggregates the number of passing vehicles for each branch direction stored in the branch direction-specific traffic volume storage unit 12 into data at appropriate time intervals for determining the signal control parameters. The signal control parameter determination unit 14 uses the number of passing vehicles for each branch direction counted by the statistical processing unit 13 to calculate the blue hour utilization rate for each display at the intersection for each branch direction. A signal control parameter (cycle and split of each display) for controlling the signal lamp 5 is determined using the time utilization factor. Further, the second communication unit 16 transmits the number of passing vehicles for each branch direction stored in the branch direction-specific traffic storage unit 12 to the central device 3. The transmission interval of the number of passing vehicles according to the branch direction to the central device 3 is every 1 second, every 5 seconds, every cycle of the signal lamp 5, every 1 minute, every 2.5 minutes, every 5 minutes, and 15 minutes. An appropriate time is set in advance, such as every 30 minutes, every hour, every 3 hours, or the like.

  The traffic measurement device 2 transmits the number of passing vehicles by branch direction to the signal control device 1 and the transmission interval by which the signal control device 1 transmits the number of passing vehicles by branch direction to the central device 3. And may be the same or different.

  The signal control device 1 of this embodiment controls the signal lamp 5 shown in FIG. The control of the signal lamp 5 by the signal control device 1 will be described with reference to FIG.

  In addition, the signal lamp 5 (not shown) with respect to the vehicle which approachs an intersection from the left-right direction and the signal lamp 5 (not shown) with respect to the vehicle which approaches an intersection from the up-down direction are installed in the intersection shown in FIG.

  In FIG. 3, the signal control device 1 displays a signal lamp 5 for a vehicle entering the intersection from the left-right direction (hereinafter referred to as a signal lamp 5 on one side) in blue, and a signal lamp for the vehicle entering the intersection from the vertical direction. The instrument 5 (hereinafter referred to as the signal lamp 5 on the other side) is controlled to display red (FIG. 3A). The state of FIG. 3 (A) gives the right to pass to vehicles entering the intersection from the left-right direction. From the state of FIG. 3A, the signal control device 1 switches the signal lamp 5 on one side to the right turn arrow display and the signal lamp 5 on the other side to red display (FIG. 3B). The state of FIG. 3 (B) gives the right of passage to the right turn vehicle entering the intersection from the left-right direction.

  Actually, from the state shown in FIG. 3A, the signal lamp on one side is displayed in yellow, and the signal lamp 5 on the other side is displayed in red, so that the state shown in FIG. Switch. The state in which the signal lamp on one side is displayed in yellow and the signal lamp 5 on the other side is displayed in red indicates that the vehicle that has entered the intersection immediately before or after the state of FIG. It is provided to let it flow out.

  From the state shown in FIG. 3B, the signal control device 1 switches the signal lamp on one side to red and the signal lamp 5 on the other side to red (FIG. 3C). The state of FIG. 3C is a so-called all-red display, and does not give the right to pass to the vehicle entering the intersection from the left-right direction and the up-down direction.

  Note that the state shown in FIG. 3B may be switched to the state shown in FIG. 3C through a state where the signal lamp on one side is displayed in yellow and the signal lamp 5 on the other side is displayed in red. . The state in which the signal lamp on one side is displayed in yellow and the signal lamp 5 on the other side is displayed in red indicates that the vehicle that has entered the intersection immediately before or after the state of FIG. It is provided to let it flow out.

  From the state of FIG. 3C, the signal control device 1 switches the signal lamp on one side to red and the signal lamp 5 on the other side to blue display (FIG. 3D). In the state shown in FIG. 3D, the right to pass is given to a vehicle entering the intersection from the up and down direction. From the state shown in FIG. 3D, the signal control device 1 switches the signal lamp 5 on one side to red and switches the signal lamp 5 on the other side to the right-turned arrow display (FIG. 3E). In the state of FIG. 3E, the right to pass is given to a right turn vehicle entering the intersection from the up and down direction.

  Actually, from the state shown in FIG. 3D, the signal lamp on one side is displayed in red, and the signal lamp 5 on the other side is displayed in yellow. Switch. The state in which the signal lamp on one side is displayed in red and the signal lamp 5 on the other side is displayed in yellow indicates that the vehicle that has entered the intersection immediately before or after the end of the state of FIG. It is provided to let it flow out.

  3 (E), the signal control device 1 switches the signal lamp on one side to red and the signal lamp 5 on the other side to red (FIG. 3 (F). This state is a so-called all-red display and does not give the right of passage to the vehicle entering the intersection from the left-right direction and the up-down direction The signal control device 1 from the state shown in FIG. Switch to the state shown in (A).

  Note that the state shown in FIG. 3E may be switched to the state shown in FIG. 3F through a state where the signal lamp on one side is displayed in yellow and the signal lamp 5 on the other side is displayed in red. . The state in which the signal lamp on one side is displayed in red and the signal lamp 5 on the other side is displayed in yellow indicates that the vehicle that has entered the intersection immediately before or after the end of the state of FIG. It is provided to let it flow out.

  The signal control device 1 determines the time from the start of the state of FIG. 3A to the start of the next FIG. 3A, that is, the cycle of the signal control parameter. Further, for each of the states of FIG. 3A, FIG. 3B, FIG. 3D, and FIG. To decide. The current indication is a traffic flow (vehicle group) to which the right of traffic is given by the traffic light 5, and in FIG. 3 (A), a vehicle group that enters the intersection from the left and right direction (no distinction between straight ahead and right / left turn). In FIG. 3 (B), it is a vehicle group that enters the intersection from the left-right direction and turns right, and in FIG. 3 (D) is a vehicle group that enters the intersection from the up-down direction (no distinction between straight travel and right / left turn), FIG. 3E shows a vehicle group that enters an intersection from the up and down direction and makes a right turn.

  In addition, the time which continues the state of FIG.3 (C) and FIG.3 (F) is normally fixed. In addition, the time for which one of the signal lamps 5 is in the yellow display state is also fixed. These times are, for example, 3 to 4 seconds.

  The signal control apparatus 1 of this embodiment uses the blue time utilization rate for each branch direction in the current display when determining each current split. The green hour utilization rate is an amount indicating the utilization efficiency of effective blue hours, and is calculated by the actual number of outflows / number of outflowable units. For the actual number of outflows, the measured value measured by the traffic measuring device 2 is used. The number of spillable vehicles is calculated as saturated traffic flow rate x blue hour. The saturation traffic flow rate is set for each branch direction.

  FIG. 4 is a block diagram showing the configuration of the traffic volume measuring apparatus of this embodiment. The traffic measuring device 2 includes an image input unit 21 to which a captured image captured by the camera 6 is input, a background image generation unit 22 that generates a background image of an intersection captured by the camera 6, and the camera 6. A vehicle extraction unit 23 that extracts a vehicle from the captured image, a vehicle tracking unit 24 that tracks the vehicle extracted by the vehicle extraction unit 23, and a passing vehicle that has passed through an intersection based on the tracking result of the vehicle tracking unit 24 A vehicle measurement unit 25 for each branch direction that measures the number of vehicles passing by the branch direction, and a communication unit 26 that transmits the number of passing vehicles measured by the vehicle measurement unit 25 for each branch direction for each branch direction to the signal control device 1. Yes. The image input unit 21 includes an A / D conversion unit and an image memory. The image input unit 21 performs A / D conversion for each frame image captured by the camera 6 by the A / D conversion unit, and stores the A / D converted image data in an image memory. The image input unit 21 corresponds to the frame image storage means referred to in the present invention. The background image generation unit 22 reads the image data of the frame image stored in the image memory of the image input unit 21 and generates a background image of the intersection. The background image generation unit 22 generates a background image without a vehicle moving within an intersection that is an imaging target of the camera 6. Since the background image is an image fixed in time, a plurality of frame images can be created by a known method using a Kalman filter or the like. In addition, a background image can be created by updating the image data with the most frequent value for each pixel within a predetermined time. The background image generation unit 22 stores the generated background image of the intersection in a memory (not shown).

  Further, the vehicle extraction unit 23 obtains a difference between the background image generated by the background generation unit 22 and the frame image input to the image input unit 21 from the camera 6, thereby obtaining a feature amount of the vehicle image (vehicle (Feature amount) is extracted. The vehicle extraction unit 23 is configured to be able to cope with a sudden change in illuminance due to a shadow or cloud of a building by passing through an illuminance change correspondence filter that extracts an edge of the image. The vehicle extraction unit 23 compares the background image generated by the background generation unit 22 with the image that has passed through the illuminance change filter, and extracts the imaged vehicle. Moreover, the vehicle extraction part 23 detects whether the vehicle passed the preset inflow point (inflow point) of the intersection, and gives ID to the vehicle which detected that it passed this inflow point. The vehicle to which the vehicle extraction unit 23 has assigned an ID is passed to the vehicle tracking unit 24. This vehicle extraction part 23 is equivalent to the vehicle labeling means said by this invention.

  The vehicle tracking unit 24 performs a tracking process for each vehicle based on the spatio-temporal data of the vehicle accumulated in time series. The vehicle tracking unit 24 corresponds to the movement vector detecting means referred to in the present invention. Moreover, the vehicle tracking part 24 is provided with the table T shown in FIG. This table T is a table for storing the ID, vector, and flag of the vehicle object belonging to each region for each frame image captured by the camera 6. The intersection region is set in advance for the intersection image when the intersection is imaged by the camera 6 as shown in FIG. In the table shown in FIG. 5, each region number of RG0, RG1,... Is assigned to the set region. The ID is an ID assigned by the vehicle extraction unit 23. This ID is set as an initial value when the vehicle passes an inflow point at a preset intersection. For example, in FIG. 6, the region of RG6 is set as a passing point. An ID is assigned by the vehicle extraction unit 23 to a vehicle that has been detected to have passed this passing point. Assuming that the frame image detected that the vehicle has passed the passing point is FL1, the ID assigned this time by the vehicle extraction unit 23 is stored in the region of RG6 corresponding to FL1. The vector represents the movement vector of the vehicle with this ID. The flag (Flag) is for storing separation of the vehicle object.

  The vehicle tracking unit 24 basically uses the frame image and vehicle at time t-1 and the frame image at time t to estimate the vehicle in the frame image at time t, thereby tracking each vehicle. I do. Various known methods can be employed for this estimation method. For example, a tracking method using a spatio-temporal Markov probability model (MRF model) can be employed. This MRF model is a technique for minimizing the evaluation function using the constraint that each image block is highly likely to be affected by neighboring blocks both spatially and temporally. By tracking using a spatio-temporal probabilistic model such as this MRF model, even if the vehicle on the frame image changes from moment to moment, it becomes less susceptible to the change and is greatly affected by fluctuations in the amount of observation. Each vehicle can be tracked without any problems. In this embodiment, the vehicle tracking unit 24 performs a tracking process using an MRF model and performs a reverse process for reassigning an ID when the vehicle is separated.

  In this reverse processing, the table T shown in FIG. 5 is referred to, and ID is reassigned to the separated new vehicle. Specifically, as shown in FIG. 7, when the vehicle A and the vehicle B are separated in the frame N, an ID is given to the separated vehicle A and the vehicle B. analyse. Referring to the table T, in the example shown in FIG. 7, for vehicles A, B, and B, vehicles with ID = 1 and ID = 2 overlap in frame N-1, and ID = 1 in frame N-2. It can be seen that the two vehicles with ID = 2 have the movement vectors of the arrows shown in the figure, and in the frame N-3, the two vehicles with ID = 1 and ID = 2 have the movement vectors of the arrows shown. Here, if the probabilistic estimation is performed, in the frame N, the separated new vehicle object A proceeds in the direction indicated by the arrow P, and the new vehicle object B proceeds in the direction indicated by the arrow Q. It can be estimated. Therefore, ID = 2 is assigned to the vehicle A separated by the frame N, and ID = 1 is assigned to the vehicle B. As a result, even when the overlapping objects are separated, there is a high probability that the reassignment of the ID will be correct, and each vehicle can be tracked with high accuracy. In the present embodiment, the number of past frames used for the reverse processing is 40 frames. The vehicle measuring unit 25 for each branch direction detects the branch direction of each vehicle at the intersection based on the tracking output input from the vehicle tracking unit 24, measures the number of vehicles for each branch direction at the intersection, and communicates with the communication unit 26. Output from. This output is input to the signal control device 1. The vehicle tracking unit 24 and the branch direction-specific vehicle measurement unit 25 correspond to the branch direction-specific measurement means referred to in the present invention.

  Furthermore, the central device 3 stores the number of vehicles for each branch direction at the intersection transmitted from the signal control device 1 at each intersection in the target area in an accumulated manner, and statistically processes the number of vehicles. Monitor traffic conditions in the area. The signal control device 1 transmits the number of passing vehicles to the central device 3 for each branch direction at the intersection measured by the traffic measuring device 2.

  Next, the operation of the signal control system according to the embodiment of the present invention will be described. First, a description will be given of a process in which the traffic volume measuring device 2 measures the number of passing vehicles for each branch direction at an intersection. FIG. 8 is a flowchart showing a process of measuring the number of passing vehicles for each branch direction at an intersection in the traffic measuring device. The traffic volume measuring device 2 receives an image of an intersection imaged by the camera 6. The traffic measuring device 2 performs an initialization process (s1). In s1, initialization processing of each variable, processing for storing the captured image of the camera 6 input to the image input unit 21 in a memory, processing for creating and storing a background image in the background image generation unit 22, and the like I do. The vehicle extraction part 23 extracts a vehicle from each frame image, and gives ID to the vehicle which detected having passed the inflow point (s2). When the extracted vehicle passes an inflow point at a predetermined intersection, the vehicle extraction unit 23 gives an ID to a vehicle that has passed through the inflow point, that is, a vehicle that has entered the intersection. The ID may be a unique value for distinguishing each vehicle, and may be a numerical value or a code. Further, the vehicle tracking unit 24 performs vehicle tracking processing and reverse processing (s3). The tracking process is a process for estimating the vehicle object at time t using the probability model such as the MRF model as described above and using the image and vehicle object at time t-1 and the image at time t. Further, the reverse process refers to the table T shown in FIG. 5, analyzes a plurality of past frames (for example, 40 frames) in reverse, estimates the ID for the separated vehicle, and estimates the estimated ID. Is given to the vehicle.

  Further, the movement vector of the vehicle to which the ID is assigned is determined (s4). This process is referred to herein as block matching. In this block matching, the movement vector of the vehicle is determined by matching with the previous frame image of each block (collecting a plurality of pixels) constituting the vehicle. FIG. 9 shows two vehicles A and B in a certain frame image. Specifically, each block is compared with the previous frame image, and if a certain block moves in the diagonally upward left direction with respect to the previous frame image, the vector for that block is in the diagonally upward left direction. This process is performed for all the blocks constituting the vehicle, and the direction in which the majority of the vectors for each block occupy is set as the movement vector for the vehicle. In the example shown in FIG. 9, for the vehicle A, A → becomes a movement vector, and for the vehicle B, B → becomes a movement vector. The movement vector of each vehicle obtained by this block matching is stored in the frame of the table T.

  Further, the center of gravity of each vehicle is calculated (s5), and the region of the vehicle where the center of gravity is calculated is determined (s6). The calculation of the center of gravity of the vehicle is for determining which region in FIG. 6 this vehicle belongs to. When a vehicle extends over a plurality of regions, the vehicle belongs to the region to which the position of the center of gravity of the vehicle belongs. Thereby, it is uniquely determined which region each vehicle belongs to in the region arrangement in FIG. This result is stored in the table T shown in FIG.

  In the traffic measuring device 2, the process shown in FIG. 8 is repeatedly executed for each frame image. The vehicle tracking unit 24 inputs the result of the vehicle tracking process performed for each frame image to the branch direction-specific vehicle measurement unit 25. The vehicle measuring unit 25 for each branch direction measures the number of vehicles for each branch direction at the intersection based on the input result of the tracking process. The traffic volume measuring device 2 performs the measurement of the number of vehicles for each branching direction at the intersection at every predetermined collection time interval or in synchronization with the signal control device 1 in the cycle of the signal lamp 5. Further, when detecting whether or not the vehicle has been separated in the reverse processing in s3, frame images for the past four frames that are temporally continuous are referred to in order to increase the accuracy of the branch determination. That is, it is determined that the vehicle is separated in the current frame image only when it can be determined that the vehicle is continuously separated in the frame images for the past four frames that are temporally continuous.

  Note that the flag stored in the table T stores that the vehicle has been separated, but this is used to determine which vehicle to perform the reverse process when performing the reverse process.

  In this way, the traffic volume measuring device 2 can measure the number of vehicles passing by the branching direction at the intersection and input it to the signal control device 1.

  Next, processing for determining signal control parameters in the signal control apparatus 1 will be described. FIG. 10 is a flowchart showing signal control parameter determination processing in the signal control apparatus. As described above, the number of vehicles passing by the branch direction at the intersection measured by the traffic measuring device 2 is cumulatively input to the signal control device 1. The signal control device 1 calculates the green time utilization rate for each branch direction for each display (s11). Specifically, in the present embodiment shown in FIG. 3A, for vehicles entering the intersection from the right side and vehicles entering the left intersection, the blue usage rate (six types of straight-turned vehicle, right-turn vehicle, and left-turn vehicle), respectively. Of blue hour). Further, in the present example shown in FIG. 3B, the blue utilization rate (two types of blue hour utilization rates) of the right turn vehicle is calculated for each vehicle that enters the intersection from the right side and the vehicle that enters the left intersection. . 3D, for vehicles entering the intersection from the upper side and vehicles entering the lower intersection, the blue usage rate (6 types of blue) of the straight-ahead vehicle, the right-turn vehicle, and the left-turn vehicle, respectively. Time utilization). In addition, in the display shown in FIG. 3 (E), the blue usage rate (two types of blue hour usage rates) for right-turn vehicles is calculated for vehicles entering the intersection from above and vehicles entering the lower intersection. To do. In the signal control device 1, a saturated traffic flow rate is set for each branch direction. This saturated traffic flow rate is set according to the size of the intersection, etc., and is generally set to a value that is the largest in straight travel and smaller in order of right turn and left turn.

  In calculating the green hour utilization rate, the statistical processing unit 13 determines the signal control parameter based on the number of passing vehicles for each branch direction accumulated in the branch direction traffic volume storage unit 12. Data collected at appropriate time intervals is used.

  When the signal control device 11 calculates the green time utilization rate for each branch direction in each display in s11, the signal control device 11 determines the blue time utilization rate for each display (s12). In s12, the blue time utilization rate for which the blue time utilization rate for each branch direction in the current display is the largest is determined as the present blue time utilization rate. The signal control device 1 redistributes the split using the currently displayed blue hour utilization rate (s13). The split redistribution in s13 extends the displayed split with the highest blue time utilization rate by a predetermined time Δt, and conversely shortens the displayed split with the smallest blue time utilization rate by a predetermined time Δt. Then, the process for calculating the green hour utilization rate for each display at this time is repeated a predetermined number of times. This is a process of selecting a pattern in which the dispersion (variation) of the blue hour utilization rate of each display is minimized.

  When completing the redistribution of the split relating to s13, the signal control device 1 determines whether or not there is an indication that the blue hour utilization rate exceeds 90% (s14). If it is determined in s14 that there is an indication that the blue hour utilization rate exceeds 90%, the cycle length is extended by ΔC (s15), and the split redistribution described in s13 is performed again (s16). Here, for the time corresponding to ΔC with the extended cycle length, splitting may be redistributed in addition to the display with the maximum blue hour utilization rate, or the display with the blue hour utilization rate exceeding 90%. Redistribution of splits that are equally divided may be performed. When the signal control device 2 completes the split redistribution in s16, the signal control device 2 re-determines whether there is an indication that the blue hour utilization rate exceeds 90% (s17).

  If the signal control apparatus 1 determines that there is an indication that the blue hour utilization rate exceeds 90% in s17, the signal control apparatus 1 determines whether or not the process of extending the cycle length by ΔC is repeated a predetermined number of times, for example, five times (s18). If the signal control apparatus 1 determines that it has not been repeated a predetermined number of times in s18, it returns to s15 and repeats the above processing. On the other hand, if it is determined in s17 that there is no indication that the blue hour utilization rate exceeds 90%, or if it is determined that the predetermined number of times is repeated in s18, the pattern selected in the immediately preceding s16 is temporarily set as the signal control parameter for the next cycle. Determine (s19).

  If the signal control apparatus 1 determines that there is no indication that the blue hour utilization rate exceeds 90% in s14, the cycle length is shortened by ΔC (s20), and the split redistribution described in s13 is performed again (s21). ). Here, the time corresponding to ΔC with the cycle length shortened may be subtracted equally from all the indications, or the blue hour utilization rate is a predetermined value, for example, 60%, and is subtracted equally from the following indications. May be.

  When completing the redistribution of the split relating to s21, the signal control device 1 re-determines whether there is an indication that the blue hour utilization rate exceeds 90% (s22). When determining that there is no indication that the blue hour utilization rate exceeds 90% in s22, the signal control device 2 determines whether or not the process of reducing the cycle length by ΔC is repeated a predetermined number of times, for example, 5 times (s24). If the signal control apparatus 1 determines that it has not been repeated a predetermined number of times in s18, it returns to s20 and repeats the above processing. On the other hand, if it is determined in s22 that there is an indication that the blue hour utilization rate exceeds 90%, or if it is determined that the predetermined number of times is repeated in s24, the pattern selected in the immediately preceding s21 is temporarily used as the signal control parameter for the next cycle. Determine (s23 or s25).

  The cycle length of the signal control parameter provisionally determined in s19 is extended, and the cycle length of the signal control parameter provisionally determined in s23 or s25 is shortened.

  Thus, since the signal control device 1 determines the signal control parameter using the number of passing vehicles for each branch direction measured by the traffic volume measuring device 2, the vehicle turns right, left, straight ahead, etc. at the intersection. The signal lamp 5 can be controlled with a signal control parameter that takes into account the traffic volume in each branch direction. Therefore, it is possible to control the signal lamp 5 that sufficiently suppresses the occurrence of traffic congestion and makes the vehicle travel smoothly. Moreover, since the blue time utilization factor for each branch direction is calculated and the signal control parameter is determined using the calculated blue hour utilization factor for each branch direction, it is possible to control the signal lamp with the wasteful blue time suppressed.

  In the above embodiment, the signal control device 1 stores the number of passing vehicles for each branch direction measured by the traffic measuring device 2 in the branch direction-specific traffic storage unit 12 in an accumulated manner. It is good also as a structure which eliminates the traffic volume memory | storage part 12 by direction, and memorize | stores the number of passing vehicles according to the branch direction measured by the traffic volume measuring apparatus 2 only in the central apparatus 3. FIG. In this case, when determining the signal control parameter, the number of passing vehicles for each branch direction may be acquired from the central device 3 as necessary.

  In addition, if the cycle and split are patterned and preset in the signal control method of the pattern selection method, the processing related to the split redistribution described above may be performed as follows. The split of the pattern determined by the pattern selection method is used as a reference value, and the split is adjusted so that a value in a predetermined range with respect to this reference value is in the range of reference value + α to reference value + β. Further, if the split to be adjusted has a high frequency of becoming the upper limit value in the range of the predetermined range or a value near the lower limit value, the preset pattern may be reset. Similarly, in setting the cycle length, the cycle of the pattern determined by the pattern selection method is used as a reference value, and a value in a predetermined range with respect to this reference value, that is, a reference value + α to a reference value + β range. The cycle may be adjusted. Moreover, if the cycle to be adjusted has a high frequency of becoming an upper limit value or a value in the vicinity of the lower limit value in a predetermined range, the preset pattern may be reset.

  Next, an embodiment in which the present invention is applied to a centralized control signal control system will be described. This centralized control signal control system also has the configuration shown in FIG. In the signal control system of this embodiment, the central device 3 determines a signal control parameter for each intersection in the target area. For each intersection, the central device 3 notifies (transmits) the signal control parameters determined for the intersection to the signal control device 1 that controls the signal lamp 5 at the intersection. The signal control device 1 at each intersection controls the signal lamp 5 based on the signal control parameter notified from the central device 3.

  FIG. 11 is a diagram showing the configuration of the signal control apparatus of this embodiment. As shown in FIG. 11, the signal control device 1 of this embodiment includes a first communication unit 11, a signal lamp control unit 15, a second communication unit 16, and a signal control parameter storage unit 17. . The 1st communication part 11, the signal lamp control part 15, and the 2nd communication part 16 are the structures similar to the signal control apparatus 1 of the signal control system of the autonomous distributed system mentioned above. In other words, the signal control device 1 of this embodiment is provided in the signal control device 1 of the above-described autonomous distributed signal control system, the traffic storage unit 12 according to the branch direction, the statistical processing unit 13, and the signal control parameter. Instead of the determination unit 14, a signal control parameter storage unit 17 is provided. The signal control parameter storage unit 17 is configured to store signal control parameters for controlling the signal lamp 5.

  When the signal control device 1 receives the number of passing vehicles for each branch direction at the intersection, which is transmitted from the traffic measuring device 2 by the first communication unit 11, the signal control device 1 sends it from the second communication unit 16 to the central device in real time. 3 to send. That is, the signal control device 1 transfers the number of passing vehicles for each branch direction transmitted from the traffic volume measuring device 2 to the central device 3. The reception interval of the number of passing vehicles for each branch direction from the traffic volume measuring device 2 is set in advance as in the signal control system of the above-described embodiment. The signal control device 1 receives the signal control parameter transmitted from the central device 3 in the second communication unit 16. When the signal control parameter is received by the second communication unit 16, the signal control device 1 stores the received signal control parameter in the signal control parameter storage unit 17. The signal control parameter storage unit 17 stores the signal control parameters transmitted from the central device 3 in an update manner. The signal lamp control unit 15 of the signal control device 1 controls the signal lamp 5 based on the signal control parameter stored in the signal control parameter storage unit 17.

  The signal control parameter storage unit 17 is provided with a function for converting the signal control parameter transmitted from the central device 3 into a format used when the signal lamp 5 is actually controlled.

  Further, the central device 3 in the signal control system of this embodiment is provided with the configuration shown in FIG. The central device 3 determines the number of passing vehicles for each branch direction at the intersection measured by the communication unit 31 that controls communication with the signal control device 1 and the traffic measuring device 2 transmitted via the signal control device 1. Branch direction traffic volume storage unit 32 that stores cumulatively, and statistical processing unit 33 that statistically processes the number of passing vehicles by branch direction at intersections stored cumulatively in the branch direction traffic volume storage unit 32. And a signal control parameter determination unit 34 that determines a signal control parameter for controlling the signal lamp 5 using the processing result of the statistical processing unit 33. A signal control device 1 at each intersection in the target area is connected to the communication unit 31. The branch direction traffic volume storage unit 32, the statistical processing unit 33, and the signal control parameter determination unit 34 included in the central device 3 are each provided in the signal control device 1 of the signal control system of the embodiment described above. The traffic volume storage unit 12, the statistical processing unit 13, and the signal control parameter determination unit 14 are substantially the same. The branch direction traffic volume storage unit 32 stores the number of passing vehicles by branch direction for each intersection in the target area. The statistical processing unit 33 and the number of passing vehicles for each branch direction at the intersection stored cumulatively in the branch direction traffic volume storage unit 32 are statistically processed. The signal control parameter determination unit 34 determines a signal control parameter for controlling the signal lamp 5 using the processing result of the statistical processing unit 33 for each intersection in the target area. Further, the central device 3 transmits the signal control parameter determined for the intersection in the signal control parameter determination unit 34 to the signal control device 1 for each intersection in the target area in the communication unit 31.

  The traffic volume measuring device 2 in the signal control system of this embodiment is the same as the traffic volume control device described in the above embodiment.

  The operation of the signal control system of this embodiment will be described. When the first communication unit 11 receives the number of vehicles for each branching direction at the intersection transmitted from the traffic measuring device 1 by the first communication unit 11, the signal control device 1 at each intersection receives the center from the second communication unit 16 in real time. Transmit to device 3. That is, the signal control device 1 at each intersection transfers to the central device 3 the number of passing vehicles for each branch direction at the intersection transmitted from the traffic measuring device 1.

  The traffic volume measuring device 2 measures the number of passing vehicles according to the branch direction at the intersection in the process shown in FIG.

  When the central device 3 receives the number of passing vehicles for each branch direction at the intersection transmitted from the signal control device 1 at any intersection in the target area, the central device 3 stores the traffic volume for each branch direction. Store in the unit 32. In the branch direction traffic volume storage unit 32, the number of passing vehicles by branch direction is stored in an accumulated manner by distinguishing each intersection in the target area.

  Further, the central device 3 determines a signal control parameter for controlling the signal lamp 5 for each intersection in the target area. When the central device 3 determines the signal control parameter for any intersection in the target area, the statistical processing unit 13 determines the number of passing vehicles according to the branch direction of the intersection for which the current signal control parameter is determined by the branch direction. Read from the traffic volume storage unit 32. At this time, the statistical processing unit 33 aggregates the number of passing vehicles for each branch direction accumulated in the storage unit 32 for each branch direction into data at appropriate time intervals for determining the signal control parameter. This is passed to the signal control parameter determination unit 34, that is, the signal control parameter determination unit 34 collects the current signal control that is aggregated into data at time intervals suitable for determining the signal control parameters in the statistical processing unit 33. The number of passing vehicles for each branch direction at the intersection where the parameter is determined is passed.

  The signal control parameter determination unit 34 determines a signal control parameter for this intersection in the process shown in FIG. When determining the signal control parameter, the central device 3 determines the signal control parameter determined this time for the signal control device 1 that controls the signal lamp 5 at the corresponding intersection (intersection where the current signal control parameter is determined) from the communication unit 31. Send.

  When the signal control parameter transmitted from the central device 3 is received by the second communication unit 16, the signal control device 1 stores the received signal control parameter in the signal control parameter storage unit 17 in an update manner. At this time, the signal control parameter storage unit 17 performs a process of converting the signal control parameter transmitted from the central device 3 into a format used when actually controlling the signal lamp 5, and the processed signal control parameter is Remember.

  Thus, since the signal control system of this embodiment also determines the signal control parameter using the number of passing vehicles for each branch direction measured by the traffic volume measuring device 2, the vehicle turns right or left at the intersection, The signal lamp 5 can be controlled with a signal control parameter that takes into consideration the traffic volume for each branching direction, such as straight ahead. Therefore, it is possible to control the signal lamp 5 that sufficiently suppresses the occurrence of traffic congestion and makes the vehicle travel smoothly. Moreover, since the blue time utilization factor for each branch direction is calculated and the signal control parameter is determined using the calculated blue hour utilization factor for each branch direction, it is possible to control the signal lamp with the wasteful blue time suppressed.

  If the cycle and split are pre-patterned and preset signal control method, the above-described split redistribution process may be performed as follows. The split of the pattern determined by the pattern selection method is used as a reference value, and the split is adjusted so that a value in a predetermined range with respect to this reference value is in the range of reference value + α to reference value + β. Further, if the split to be adjusted has a high frequency of becoming the upper limit value in the range of the predetermined range or a value near the lower limit value, the preset pattern may be reset. Similarly, in setting the cycle length, the cycle of the pattern determined by the pattern selection method is used as a reference value, and a value in a predetermined range with respect to this reference value, that is, a reference value + α to a reference value + β range. The cycle may be adjusted. Moreover, if the cycle to be adjusted has a high frequency of becoming an upper limit value or a value in the vicinity of the lower limit value in a predetermined range, the preset pattern may be reset.

It is a figure which shows the structure of the signal control system which is embodiment of this invention. It is a block diagram which shows the structure of the signal control apparatus which is embodiment of this invention. It is a figure explaining presenting. It is a block diagram which shows the structure of the traffic measuring device which is embodiment of this invention. It is a figure which shows the table of the traffic measuring device which is embodiment of this invention. It is a figure explaining the region set to an intersection. It is a figure explaining the reverse process in the traffic measuring device which is embodiment of this invention. It is a flowchart which shows operation | movement of the traffic-volume measuring apparatus which is embodiment of this invention. It is a figure explaining the process which determines the movement vector of the vehicle in the traffic measuring device which is embodiment of this invention. It is a flowchart which shows operation | movement of the signal control apparatus which is embodiment of this invention. It is a block diagram which shows the structure of the signal control apparatus in the signal control system which is another embodiment of this invention. It is a block diagram which shows the structure of the central apparatus in the signal control system which is another embodiment of this invention.

Explanation of symbols

1-signal control device 2-traffic volume measuring device 3-central device 5-signal lamp 6-camera 11-first communication unit 12-traffic volume storage unit 13-statistical processing unit 14-signal control parameter determination unit 15-signal lamp control unit 16-second communication unit 21-image input unit 22-background image generation unit 23-vehicle extraction unit 24-vehicle tracking unit 25-vehicle measuring unit according to branch direction 26-communication unit

Claims (8)

A traffic volume measuring device having a branch direction measuring means for capturing a vehicle passing through an intersection with a camera and measuring the number of vehicles passing through the intersection from the captured image for each branch direction;
A signal control parameter for determining a signal control parameter for controlling a signal lamp installed at this intersection, using the number of vehicles for each branch direction at the intersection, measured by the branch direction measuring means of the traffic measuring device. A determination means;
A signal control system comprising: a signal control device having signal lamp control means for controlling the signal lamp based on the signal control parameter determined by the signal control parameter determination means. A traffic volume measuring device having a branch direction measuring means for capturing a vehicle passing through an intersection with a camera and measuring the number of vehicles passing through the intersection from the captured image for each branch direction;
A signal control parameter for determining a signal control parameter for controlling a signal lamp installed at this intersection, using the number of vehicles for each branch direction at the intersection, measured by the branch direction measuring means of the traffic measuring device. A central device having a determining means;
A signal control system comprising: a signal control device having signal lamp control means for controlling a signal lamp based on the signal control parameter determined by the signal control parameter determination means of the central device. A frame image storage means for capturing a vehicle passing through an intersection with a camera and storing frame images captured by the camera in time series;
Vehicle labeling means for extracting a vehicle imaged from the frame image stored in time series in the frame image storage means and assigning an ID to each extracted vehicle;
Using a plurality of temporally continuous frame images, a movement vector detection means for obtaining a movement vector for each vehicle to which an ID is given by the vehicle labeling means;
The ID assigned by the vehicle labeling means and the movement vector detected by the movement vector detection means are registered in a table for each preset divided area and for each frame image, and pass through the intersection using the table. A traffic volume measuring device having a measuring means for each branch direction for measuring the number of vehicles by the branch direction,
A signal control parameter for determining a signal control parameter for controlling a signal lamp installed at this intersection, using the number of vehicles for each branch direction at the intersection, measured by the branch direction measuring means of the traffic measuring device. A determination means;
A signal control system comprising: a signal control device having signal lamp control means for controlling a signal lamp based on the signal control parameter determined by the signal control parameter determination means. A frame image storage means for capturing a vehicle passing through an intersection with a camera and storing frame images captured by the camera in time series;
Vehicle labeling means for extracting a vehicle imaged from the frame image stored in time series in the frame image storage means and assigning an ID to each extracted vehicle;
Using a plurality of temporally continuous frame images, a movement vector detection means for obtaining a movement vector for each vehicle to which an ID is given by the vehicle labeling means;
The ID assigned by the vehicle labeling means and the movement vector detected by the movement vector detection means are registered in a table for each preset divided area and for each frame image, and pass through the intersection using the table. A traffic volume measuring device having a measuring means for each branch direction for measuring the number of vehicles by the branch direction,
A signal control parameter for determining a signal control parameter for controlling a signal lamp installed at this intersection, using the number of vehicles for each branch direction at the intersection, measured by the branch direction measuring means of the traffic measuring device. A central device having a determining means;
A signal control system comprising: a signal control device having signal lamp control means for controlling the signal lamp based on the signal control parameter determined by the signal control parameter determination means of the central device.   The signal control parameter determining means calculates a blue hour utilization rate for each indication for each branch direction, and determines the signal control parameter using the calculated blue time utilization rate for each branch direction. The signal control system according to any one of claims 1 to 4.   3. The signal control parameter determining means is means for determining the signal control parameter by setting the blue time utilization rate in the branch direction that is maximum for each presentation as the present blue time utilization rate. Signal control system.   The signal control system according to any one of claims 1 to 6, wherein the signal control parameter determination means is a means for determining a signal control parameter including a right arrow. Process the captured image of the vehicle that passes through the intersection captured by the camera, measure the number of vehicles that have passed through this intersection for each branch direction,
Using the number of vehicles by the branch direction at the intersection measured here, determine the signal control parameter to control the signal lamp installed at this intersection,
A signal control method for controlling a signal lamp installed at this intersection based on the signal control parameter determined here.

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