JP7380304B2 - Traffic monitoring devices, traffic monitoring methods, and traffic monitoring programs - Google Patents

Description

The present invention relates to technology for monitoring dangerous driving of vehicles at intersections.

BACKGROUND ART Conventionally, there have been devices that process images taken of intersections and monitor traffic violations such as ignoring traffic lights and speeding (see Patent Documents 1 and 2, etc.).

Japanese Unexamined Patent Publication No. 6-96385 Japanese Patent Application Publication No. 10-162288

However, when making a right turn at an intersection, some drivers sometimes make a dangerous right turn. The term "quick right turn" here refers to the act of driving to cross the oncoming lane and turn right immediately after the traffic light changes from red to green, before the vehicle in the oncoming lane enters the intersection. This early right turn is an act that obstructs the travel of vehicles traveling in the oncoming lane. Furthermore, accidents caused by vehicles making quick right turns (vehicles whose drivers make quick right turns) also occur at intersections.

The devices described in Patent Documents 1, 2, etc. were unable to detect the above-mentioned vehicle making a quick right turn.

The object of this invention is to prevent a vehicle that makes a quick right turn (dangerous driving ) to provide technology for detecting

The traffic monitoring device of the present invention is configured as shown below in order to achieve the above object.

A change time acquisition unit acquires the time when a traffic light installed at an intersection changes from a red light to a green light. Further, the vehicle detection unit processes the image taken of the intersection, and detects a right-turning vehicle that has entered the intersection from the inflow link and turned right. Then, the determination unit determines the first time of the time when the right-turning vehicle crossed the oncoming lane detected by the vehicle detection unit and the time when the traffic light for the right-turning vehicle changed from a red light to a green light, which was acquired by the change time acquisition unit. Based on the time difference, it is determined whether the right-turning vehicle is a dangerous driving vehicle (quick right-turning vehicle).

In this configuration, when a driver makes a right turn at an intersection, immediately after the traffic light changes from red to green, the driver risks crossing the oncoming lane and making a right turn ahead of the oncoming vehicle entering the intersection. A vehicle making a quick right turn can be detected as a dangerously driven vehicle.

For example, if the first time difference exceeds the first threshold time, the determination unit does not determine that the vehicle is an early right turn vehicle. In other words, a vehicle that crosses the oncoming lane after a certain amount of time has passed after the traffic light changes from red to green is a vehicle that turns right after checking the situation of the vehicle traveling in the oncoming lane. Therefore, it is not determined that the vehicle is making an early right turn.

For example, for two inflow links whose approach directions to an intersection are opposite, the vehicle detection unit detects, in addition to a right-turning vehicle that entered the intersection from one inflow link and turned right, an oncoming vehicle that entered the intersection from the other inflow link. The vehicle is detected, and the determination unit determines whether the right-turning vehicle is dangerous by adding a second time difference between the time when the right-turning vehicle detected by the vehicle detection unit crosses the oncoming lane and the time when the oncoming vehicle enters the intersection. It may be configured to determine whether the vehicle is a driving vehicle.

With this configuration, if a vehicle traveling in the oncoming lane is a certain distance away from the intersection when the traffic light changes from red to green, the vehicle that is making a quick right turn will be able to reach the right-turning vehicle that has crossed the oncoming lane. It is possible to prevent it from being determined that it is.

In this case, the determination unit may be configured not to determine that the vehicle is driving dangerously if the second time difference exceeds the second threshold time.

Further, for example, the change time acquisition unit can be configured to acquire the time at which a red light changes to a green light from a signal control device that controls switching of the light color signal of a traffic light installed at an intersection. Accurately obtain the time when the light changes from red to green.

According to this invention, immediately after a traffic light changes from red to green, a vehicle that crosses the oncoming lane and turns right before a vehicle in the oncoming lane entering the intersection can be detected as a dangerous driving vehicle. can.

FIG. 2 is a schematic diagram of an intersection where the traffic monitoring device according to this example is applied to detect a vehicle making an early right turn. FIG. 2 is a diagram showing the configuration of an early right turn vehicle determination system to which the traffic monitoring device according to this example is applied. FIG. 2 is a block diagram showing the main parts of the traffic monitoring device of this example. It is a flowchart showing the operation of the traffic monitoring device of this example. 7 is a flowchart showing the operation of the traffic monitoring device of Modification 1. 12 is a flowchart showing the operation of a traffic monitoring device according to a second modification. 12 is a flowchart showing the operation of the traffic monitoring device of Modification 3.

Embodiments of this invention will be described below.

<1. Application example＞
FIG. 1 is a schematic diagram of an intersection where a traffic monitoring device according to this example is applied to detect a vehicle making an early right turn. FIG. 2 is a diagram showing the configuration of an early right turn vehicle determination system to which the traffic monitoring device according to this example is applied. In this example, the road on which the vehicle 100 travels in the vertical direction in FIG. 1 is referred to as a main road, and the road on which the vehicle 100 travels in the left-right direction in FIG. 1 is referred to as a secondary road.

At the intersection, traffic lights 3a and 3b for vehicles 100 traveling on the main road, and traffic lights 3c and 3d for vehicles 100 traveling on the secondary roads are installed. Further, a signal control device 2 installed near the intersection controls the light color signals for each traffic light 3 (3a to 3d). In this example, the signal control device 2 switches (changes) the traffic lights 3a and 3b for the vehicle 100 traveling on the main road from a red light to a green light at the same timing. The signal control device 2 switches (changes) the traffic lights 3c and 3d for the vehicle 100 traveling on the secondary road from a red light to a green light at the same timing.

Furthermore, in this example, two cameras 5 (5a, 5b) are installed at the intersection. The camera 5 is a video camera that captures moving images, and has a frame rate of several tens of frames/Sec (for example, 10 to 30 frames/Sec). Furthermore, the camera 5 has a function of attaching a time stamp to the captured moving image. The two cameras 5 are installed at angles that allow them to image the inside of the intersection. Further, in FIG. 1, the camera 5a is installed at an angle that allows the imaging area to include the vicinity of the stop line of the main road on which the vehicle 100 travels downward, and the vicinity of the stop line of the minor road on which the vehicle 100 travels to the left. There is. In FIG. 1, the camera 5b is installed at an angle such that its imaging area includes the vicinity of the stop line of the main road on which the vehicle 100 travels upward and the vicinity of the stop line of the minor road on which the vehicle 100 travels rightward.

In the right turn early vehicle determination system of this example, a signal control device 2 and a camera 5 are connected to a traffic monitoring device 1 . The signal control device 2 outputs to the traffic monitoring device 1 the time when the light color signal of the traffic light 3 installed at the intersection was changed from a red light to a green light. More specifically, the signal control device 2 distinguishes the time when the traffic lights 3a and 3b are switched from red to green, and the time when the traffic lights 3c and 3d are switched from red to green, and outputs them to the traffic monitoring device 1. do.

Furthermore, the cameras 5a and 5b output captured images (moving images) of the intersection to the traffic monitoring device 1.

Further, a process (time synchronization process) is periodically performed to match the current time measured by a timer built in the signal control device 2 and the current time measured by a timer built in the camera 5.

Note that the traffic monitoring device 1 and the signal control device 2 are not connected, and the time when the signal control device 2 switches the light color of the traffic light 3 installed at the intersection from a red light to a green light is recorded on an HDD (Hard Disk Drive). ), SSD (Solid State Drive), or other recording medium, and the recording medium may be connected to the traffic monitoring device 1. Alternatively, the traffic monitoring device 1 and the camera 5 are not connected, but the camera 5 records an image of an intersection on a recording medium such as an HDD or SSD, and the recording medium is connected to the traffic monitoring device 1. It's okay.

For each inflow link at an intersection, the captured image used to detect a vehicle making a quick right turn may be captured by either one of the cameras 5a, 5b, or may be captured by both cameras 5a, 5b. You may use something. In this example, the traffic monitoring device 1 uses the captured image of the camera 5a and the time when the traffic lights 3a and 3b change from red to green to detect the vehicle 100 traveling upward and entering the intersection in FIG. It is determined whether or not the vehicle 100 is making a quick right turn. In addition, the traffic monitoring device 1 uses the image captured by the camera 5a and the time when the traffic lights 3c and 3d change from red to green, and in FIG. It is determined whether the vehicle 100 is an early turning vehicle. In addition, the traffic monitoring device 1 uses the image captured by the camera 5b and the time when the traffic lights 3a and 3b change from red to green, and in FIG. It is determined whether the vehicle 100 is an early turning vehicle. In addition, the traffic monitoring device 1 uses the image captured by the camera 5b and the time when the traffic lights 3a and 3b change from red to green, and in FIG. It is determined whether the vehicle 100 is an early turning vehicle.

The vehicle 100 making a right turn quickly means that when a driver turns right at an intersection, immediately after the traffic light 3 changes from red to green, the vehicle 100 in the oncoming lane enters the intersection before the vehicle 100 in the opposite lane enters the intersection. This is a vehicle 100 that engaged in dangerous driving by crossing lanes and turning right. The vehicle 100 that makes a quick right turn is the vehicle 100 that obstructs the travel of the vehicle 100 that is traveling in the oncoming lane.

Further, in this example, the time when the traffic light 3 changes from a red light to a green light is the time when the signal control device 2 switches the light color signal of the traffic light 3 from a red light to a green light.

<2. Configuration example>
FIG. 3 is a block diagram showing the main parts of the traffic monitoring device of this example. The traffic monitoring device 1 includes a control unit 11, an image input section 12, a light color signal input section 13, and a determination result output section 14.

The control unit 11 controls the operation of each part of the traffic monitoring device 1 main body. Further, the control unit 11 includes an image processing section 11a and a determination section 11b. Details of the image processing section 11a and the determination section 11b will be described later.

The image input unit 12 receives a moving image of the intersection captured by the cameras 5a and 5b. The image input unit 12 has a storage medium such as an HDD or an SSD that stores input moving images.

The light color signal input unit 13 contains the time when the main road side traffic lights 3a and 3b installed at the intersection changed from red to green, and the time when the secondary road side traffic lights 3c and 3d installed at the intersection changed to red. The time at which the signal changes from a green signal to a green signal is input from the signal control device 2. The traffic monitoring device 1 detects the time when the main road side traffic lights 3a and 3b installed at the intersection change from red to green, and the time when the secondary road side traffic lights 3c and 3d installed at the intersection change from red to green. It has a storage unit (not shown) that separately stores the time when the time changed to . This lamp color signal input section 13 corresponds to a change time acquisition section in the present invention.

The determination result output unit 14 outputs information regarding the vehicle 100 determined by the control unit 11 to be an early right turn vehicle 100 to a host device (not shown) as a determination result.

Next, the image processing section 11a and determination section 11b included in the control unit 11 will be described.

The image processing unit 11a processes the captured image of the intersection input to the image input unit 12, and performs image processing to detect a vehicle 100, etc. that has turned right at the intersection. This image processing section 11a corresponds to the vehicle detection section in the present invention.

The determining unit 11b determines whether the vehicle 100 that turned right at the intersection detected by the image processing unit 11a is the vehicle 100 that makes a quick right turn. The determination unit 11b determines the time difference (first It is determined whether the vehicle 100 is an early right-turning vehicle 100 based on the time difference). More specifically, the determining unit 11b determines that the vehicle 100 is making a quick right turn when the first time difference is a first threshold time (for example, less than 1 to 2 seconds). This first time difference is the absolute value of the time difference between the time when the vehicle 100 that turned right at the intersection crossed the oncoming lane and the time when the traffic light 3 for this vehicle 100 changed from a red light to a green light. As a result, the determination unit 11b determines whether the vehicle 100 enters the intersection and turns right during the all-red time when all the traffic lights 3 installed at the intersection are red (before the red light changes to green). It can be determined that the vehicle 100 is making a quick right turn.

The time when the vehicle 100 that turned right at an intersection crossed the oncoming lane may be the time when the head of this vehicle 100 entered the oncoming lane, or the time when the tail of this vehicle 100 entered the oncoming lane. However, it may be determined based on other criteria.

The control unit 11 of the traffic monitoring device 1 is composed of a hardware CPU, memory, and other electronic circuits. When the hardware CPU executes the traffic monitoring program according to the present invention, it operates as the image processing section 11a and the determination section 11b. The memory also has an area for developing the traffic monitoring program according to the present invention and an area for temporarily storing data generated when the traffic monitoring program is executed. The control unit 11 may be an LSI integrated with a hardware CPU, memory, and the like. Further, the hardware CPU is a computer that executes the traffic monitoring method according to the present invention.

<3. Operation example>
FIG. 4 is a flowchart showing the operation of the traffic monitoring device in this example. Here, an example will be described in which a vehicle 100 on an inflow link traveling upward and entering an intersection in FIG. 1 is detected, and a vehicle 100 making a quick right turn is detected.

The image processing unit 11a processes the captured image of the camera 5a input to the image input unit 12, and in FIG. (right-turning vehicle 100) is detected (s1). At this time, the image processing unit 11a acquires the time at which the detected right-turning vehicle 100 crossed the oncoming lane, based on the time stamp attached to the image captured by the camera 5a.

The determination unit 11b acquires the most recent time when the traffic light 3a changed from red to green with respect to the time when the right-turning vehicle 100 crossed the oncoming lane detected in s1 (s2). The determination unit 11b calculates the absolute value of the time difference between the time when the right-turning vehicle 100 crosses the oncoming lane and the most recent time when the traffic light 3a changed from a red light to a green light obtained in s2 as a first time difference (s3). . The determining unit 11b determines whether the first time difference calculated in s3 is less than or equal to a set first threshold time (for example, about 1 to 2 seconds) (s4).

When determining that the first time difference is less than or equal to the first threshold time, the determining unit 11b determines that the right-turning vehicle 100 detected by the image processing unit 11a in s1 is an early right-turning vehicle 100 (dangerous driving vehicle 100). s5). The determination unit 11b generates vehicle information of the vehicle 100 determined to be the vehicle 100 making a quick right turn in s5 (s6). The vehicle information generated in s6 includes not only the intersection ID that identifies the intersection and the right turn time at the intersection, but also the license plate number written on the license plate of this vehicle 100, and the frame in which the driver's face is captured. It may be one in which images or the like are associated. The license plate number can be acquired by performing a known character recognition process in the image processing section 11a.

In the traffic monitoring device 1, the determination result output unit 14 outputs the vehicle information generated in s6 to the host device as a determination result (s7), and returns to s1. Furthermore, if the first time difference calculated in s3 is not equal to or less than the set first threshold time, the traffic monitoring device 1 returns to s1 without the determining unit 11b determining that the vehicle is an early right-turning vehicle.

In this way, the traffic monitoring device 1 according to this example crosses the oncoming lane and turns right before the vehicle 100 in the oncoming lane entering the intersection immediately after the traffic light 3 changes from a red light to a green light. The vehicle 100 that makes a quick right turn can be detected as a dangerous driving vehicle.

Note that for other incoming links of the intersection shown in FIG. 1, the early right-turning vehicle 100 can be detected as a dangerous driving vehicle by the same process.

Furthermore, the traffic monitoring device 1 is configured to temporarily store the vehicle information generated in s6 in a memory or the like, and output the vehicle information stored in the memory all at once to the host device at an appropriate timing. It's okay.

<4. Modified example>
Next, a modification of the traffic monitoring device 1 according to the present invention will be described.

・Modification example 1
The traffic monitoring device 1 of this modified example 1 has the configuration shown in FIG. 3 similarly to the above-described example. The traffic monitoring device of Modification 1 differs in that it performs the process shown in FIG. 5 instead of the process shown in FIG. 4 above. FIG. 5 is a flowchart showing the operation of the traffic monitoring device of Modification 1.

This first modification will also be described using as an example a case in which a vehicle 100 making a quick right turn is detected, with the vehicle 100 on the inflow link traveling upward and entering an intersection in FIG. 1 as the object.

The determination unit 11b determines the processing target time (s11). The determination unit 11b determines the time when the traffic light 3a changes from a red light to a green light, which is after the previously determined processing target time and which is temporally closest to the previously determined processing target time, as the current processing target time.

The image processing unit 11a extracts captured images of the intersection captured by the camera 5a during the first threshold time before and after the processing target time determined by the determining unit 11b in s11 (s12). The image processing unit 11a extracts the captured image of the intersection captured by the camera 5a based on the time stamp attached to the captured image of the camera 5a.

The image processing unit 11a processes the captured image extracted in s12 to detect a vehicle 100 that has traveled upward and entered the intersection in FIG. 1 and has turned right at the intersection (right-turning vehicle 100). (s13). If the right-turning vehicle 100 is not detected in s13, the traffic monitoring device 1 returns to s11.

When the image processing unit 11a detects the right-turning vehicle 100 in s13, the determining unit 11b determines that the right-turning vehicle 100 is an early right-turning vehicle 100 (s14). The determination unit 11b generates vehicle information regarding the vehicle 100 determined to be the vehicle 100 making a quick right turn in s14 (s15). s15 is the same process as s6 described above. In the traffic monitoring device 1, the determination result output unit 14 outputs the vehicle information generated in s15 to the host device as a determination result (s16), and returns to s11. Furthermore, if the right-turning vehicle 100 is not detected in s13, the traffic monitoring device 1 returns to s11.

In this way, the traffic monitoring device 1 according to the first modification also crosses the oncoming lane before the vehicle 100 in the oncoming lane entering the intersection immediately after the traffic light 3 changes from a red light to a green light. The right-turning vehicle 100 that has turned right can be detected as a dangerous driving vehicle.

Furthermore, in the traffic monitoring device 1 according to the first modification, the image processing unit 11a narrows down the images captured by the camera 5 for detecting the right-turning vehicle 100. Therefore, the processing load on the image processing section 11a can be suppressed.

・Modification 2
The traffic monitoring device 1 of this modification 2 has the configuration shown in FIG. 3 similarly to the above-described example. The traffic monitoring device 1 of this second modification is different in that it performs the processing shown in FIG. 6 instead of the processing shown in FIG. 4 or FIG. 5 above. FIG. 6 is a flowchart showing the operation of the traffic monitoring device according to the second modification.

This second modification will also be described using as an example a case where a vehicle 100 on an incoming link traveling upward and entering an intersection in FIG. 1 is targeted, and a vehicle 100 making a quick right turn is detected.

The image processing unit 11a processes the captured image of the camera 5a input to the image input unit 12, and in FIG. (right-turning vehicle 100) is detected (s21). The processing related to this s21 is the same as s1 described above.

The determination unit 11b acquires the most recent time when the traffic light 3a changed from red to green with respect to the time when the right-turning vehicle 100 crossed the oncoming lane detected in s21 (s22). The determination unit 11b calculates the absolute value of the time difference between the time when the right-turning vehicle 100 crosses the oncoming lane and the most recent time when the traffic light 3a changed from a red light to a green light obtained in s22 as a first time difference (s23). . The determination unit 11b determines whether the first time difference calculated in s23 is less than or equal to a set first threshold time (for example, about 1 to 2 seconds) (s4). s22 to s24 are the same processes as s2 to s4 described above.

If the determining unit 11b determines in s24 that the time is not equal to or less than the first threshold time, the traffic monitoring device 1 returns to s21. If the determination unit 11b determines in s24 that the time is equal to or less than the first threshold time, the image processing unit 11a determines that the oncoming vehicle 100 that entered the intersection first after the right-turning vehicle 100 detected in s21 crossed the oncoming lane enters the intersection. The time is detected (s25). In this example, it is determined whether the vehicle 100 traveling upward in FIG. This is a vehicle 100. Further, the intersection entry time may be the time when the tail of the vehicle passes a stop line provided in front of the intersection.

The determination unit 11b calculates the time difference between the time when the right-turning vehicle 100 crosses the oncoming lane, detected by the image processing unit 11a in s21, and the time when the oncoming vehicle 100 enters the intersection, detected in s25, as a second time difference (s26). . The determination unit 11b determines whether the second time difference calculated in s26 is less than or equal to the second threshold time (for example, 1 to 2 seconds) (s27). If the determination unit 11b determines in s27 that the second time difference is not equal to or less than the second threshold time, the process returns to s21. The first threshold time and the second threshold time may be the same time or may be different times.

If the determination unit 11b determines in s27 that the second time difference is less than or equal to the second threshold time, the determination unit 11b determines that the second time difference is equal to or less than the second threshold time, and immediately after the traffic light 3 changes from a red light to a green light, even though there is a vehicle 100 entering the intersection from the oncoming lane. , it is determined that the vehicle 100 is an early right-turn vehicle 100 that has entered the intersection and crossed the oncoming lane (s28).

The determination unit 11b generates vehicle information regarding the vehicle 100 determined to be an early right turn vehicle in s28 (s29). The vehicle information generated in s29 includes not only the intersection ID that identifies the intersection and the right turn time at the intersection, but also the license plate number written on the license plate of this vehicle 100, and the frame in which the driver's face is captured. It may be one in which images or the like are associated.

In the traffic monitoring device 1, the determination result output unit 14 outputs the vehicle information generated in s29 to the host device as a determination result (s30), and returns to s21.

s29 and s30 are the same processes as s6 and s7 described above.

In this way, the traffic monitoring device 1 according to the second modification example detects the oncoming vehicle even if the vehicle 100 enters the intersection, crosses the oncoming lane and turns right immediately after the traffic light 3 changes from red to green. If there is no vehicle 100 entering the intersection in the lane, it is not determined that the vehicle 100 is making a quick right turn. That is, the traffic monitoring device 1 according to the second modification example detects a vehicle 100 that enters an intersection, crosses the oncoming lane, and turns right immediately after the traffic light 3 changes from red to green; The vehicle 100 that obstructs the traveling vehicle 100 is determined to be a vehicle 100 making a quick right turn (dangerous driving vehicle 100). In other words, the traffic monitoring device 1 according to the second modification can detect the presence of traffic in the oncoming lane even if the vehicle 100 enters the intersection, crosses the oncoming lane and turns right immediately after the traffic light 3 changes from red to green. Vehicles 100 that are not interfering with the traveling of vehicles 100 that are traveling are not determined to be early right-turning vehicles 100 (dangerously driven vehicles 100).

・Modification 3
The traffic monitoring device 1 of this modified example 3 has the configuration shown in FIG. 3 similarly to the above-described example. The traffic monitoring device of this modified example 3 is different in that it performs the processing shown in FIG. 7 instead of the processing shown in FIG. 4, FIG. 5, or FIG. 6 described above. FIG. 7 is a flowchart showing the operation of the traffic monitoring device according to the third modification.

This third modification will also be described using as an example a case where a vehicle 100 on an inflow link traveling upward and entering an intersection in FIG. 1 is targeted, and a vehicle 100 making a quick right turn is detected.

The determining unit 11b determines the processing target time (s41). The determination unit 11b determines the time when the traffic light 3a changes from a red light to a green light, which is after the previously determined processing target time and which is temporally closest to the previously determined processing target time, as the current processing target time. This s41 is the same process as s11 described above.

The image processing unit 11a extracts the captured images of the intersection captured by the camera 5a during the first threshold time before and after the processing target time determined by the determining unit 11b in s41 (s42). The image processing unit 11a extracts the captured image of the intersection captured by the camera 5a based on the time stamp attached to the captured image of the camera 5a. This s42 is the same process as s12 described above.

Immediately before the processing target time determined in s41 (that is, immediately before the traffic light 3 changes from a red light to a green light), the image processing unit 11a detects an oncoming lane (in FIG. 1, an inflow traveling downward and entering an intersection). It is determined whether there is a vehicle 100 stopped at a traffic light (link) (s43).

In the traffic monitoring device 1 of the third modification, when the image processing unit 11a determines in s43 that there is no vehicle 100 stopped at a traffic light in the oncoming lane, the process returns to s41.

When the image processing unit 11a determines in s43 that there is a vehicle 100 stopped at a traffic light in the oncoming lane, it processes the captured image extracted in s42, and as shown in FIG. 1, the vehicle 100 travels upward and enters the intersection. The vehicle 100 that has turned right at the intersection (right-turning vehicle 100) is detected (s44). If the right-turning vehicle 100 is not detected in s44, the traffic monitoring device 1 returns to s41.

When the image processing unit 11a detects the right-turning vehicle 100 in s44, the determining unit 11b determines that the right-turning vehicle 100 is an early right-turning vehicle 100 (s45). The determination unit 11b generates vehicle information regarding the vehicle 100 determined to be the vehicle 100 making a quick right turn in s45 (s46). s46 is the same process as s6 described above. In the traffic monitoring device 1, the determination result output unit 14 outputs the vehicle information generated in s46 to the host device as a determination result (s47), and returns to s41.

The processing related to s44 to s47 is the same as the processing related to s13 to s16 in the first modification described above.

As described above, the traffic monitoring device 1 according to the third modification, similar to the traffic monitoring device 1 of the second modification described above, enters the intersection immediately after the traffic light 3 changes from red to green, and monitors the oncoming lane. A vehicle 100 that crosses the road and turns right and obstructs the travel of a vehicle 100 traveling in the opposite lane is determined to be a vehicle 100 making a quick right turn (dangerous driving vehicle 100).

Further, in this third modification, the presence or absence of the oncoming vehicle 100 is determined in s43, and if there is no oncoming vehicle 100, the processing from s44 onward is not performed, so that the processing load on the image processing unit 11a can be further reduced. .

Furthermore, in the above example, the traffic monitoring device 1 acquires the time when the traffic light 3 changes from a red light to a green light from the signal control device 2, but the traffic monitoring device 1 processes the image captured by the camera 5 and 3 may be configured to acquire the time when the light changes from red to green. In this case, the camera 5 is installed at an angle that fits the traffic light 3 within the imaging area.

It should be noted that the present invention is not limited to the above-described embodiments as they are, but can be embodied by modifying the constituent elements within the scope of the invention at the implementation stage. Moreover, various inventions can be formed by appropriately combining the plurality of components disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiments. Furthermore, components from different embodiments may be combined as appropriate.

Furthermore, the correspondence between the configuration according to the present invention and the configuration according to the above-described embodiments can be described as in the following supplementary notes.
<Additional notes>
a change time acquisition unit (13) that acquires the time when a traffic light (3) installed at an intersection changes from a red light to a green light;
a vehicle detection unit (11a) that processes an image taken of the intersection and detects a right-turning vehicle (100) that has entered the intersection from an inflow link and turned right;
The time when the right-turning vehicle (100) crossed the oncoming lane, which was detected by the vehicle detection unit (11a), and the time when the traffic light (3) for the right-turning vehicle, which was acquired by the change time acquisition unit (13), was red. A traffic monitoring device (1) comprising: a determination unit (11b) that determines whether the right-turning vehicle (100) is a dangerous driving vehicle (100) based on a first time difference between ).

1...Traffic monitoring device 2...Signal control device 3 (3a to 3d)...Traffic light 5 (5a, 5b)...Camera 11...Control unit 11a...Image processing section 11b...Determination section 12...Image input section 13...Light color signal input Section 14...Judgment result output section 100...Vehicle

Claims (7)

a change time acquisition unit that acquires the time when a traffic light installed at an intersection changes from a red light to a green light;
a vehicle detection unit that processes an image taken of the intersection and detects a right-turning vehicle that has entered the intersection from an inflow link and turned right;
A first time difference between a time when the right-turning vehicle crosses an oncoming lane, which is detected by the vehicle detection unit, and a time when the traffic light for the right-turning vehicle changes from a red light to a green light, which is acquired by the change time acquisition unit. a determination unit that determines whether the right-turning vehicle is a dangerous driving vehicle based on the following. The traffic monitoring device according to claim 1, wherein the determination unit does not determine that the vehicle is driving dangerously if the first time difference exceeds a first threshold time. Regarding two inflow links whose approach directions to the intersection are opposite, the vehicle detection unit detects that, in addition to the right-turning vehicle that entered the intersection from one of the inflow links and turned right, the vehicle entered the intersection from the other inflow link. Detects oncoming vehicles,
The determination unit also adds a second time difference between the time when the right-turning vehicle crossed the oncoming lane detected by the vehicle detection unit and the time when the oncoming vehicle entered the intersection, and determines that the right-turning vehicle is dangerous. The traffic monitoring device according to claim 1 or 2, which determines whether the vehicle is a driving vehicle. The traffic monitoring device according to claim 3, wherein the determination unit does not determine that the vehicle is driving dangerously if the second time difference exceeds a second threshold time. Any one of claims 1 to 3, wherein the change time acquisition unit acquires the time at which a red light changes to a green light from a signal control device that controls switching of a light color signal of the traffic light installed at the intersection. The traffic monitoring device described in . a change time acquisition step in which the change time acquisition unit acquires the time at which a traffic light installed at the intersection changes from a red light to a green light;
a vehicle detection step of processing an image taken of the intersection to detect a right-turning vehicle that entered the intersection from an inflow link and turned right;
Based on a first time difference between the time when the right-turning vehicle crossed the oncoming lane detected in the vehicle detection step and the time when the traffic light for the right-turning vehicle changed from a red light to a green light, which was obtained in the change time acquisition step. , a determining step of determining whether the right-turning vehicle is a dangerously driven vehicle. a change time acquisition step in which the change time acquisition unit acquires the time at which a traffic light installed at the intersection changes from a red light to a green light;
a vehicle detection step of processing an image taken of the intersection to detect a right-turning vehicle that entered the intersection from an inflow link and turned right;
Based on a first time difference between the time when the right-turning vehicle crossed the oncoming lane detected in the vehicle detection step and the time when the traffic light for the right-turning vehicle changed from a red light to a green light, which was obtained in the change time acquisition step. A traffic monitoring program that causes a computer to execute the following steps: determining whether the right-turning vehicle is a dangerous driving vehicle.

Images