Patent ID: 12219237

EXAMPLE EMBODIMENT

First, an outline of an example embodiment of the present invention will be described with reference to the drawings. The reference numerals in the drawings attached to this outline are attached to each element for convenience as an example for assisting understanding, and are not intended to limit the present invention to the illustrated aspects. Connection lines between blocks in the drawings and the like referred to in the following description include both bidirectional and unidirectional. The unidirectional arrow schematically indicates a flow of a main signal (data), and does not exclude bidirectionality. Although there are ports and interfaces at connection points of input and output of each block in the drawing, they are not illustrated. In the following description, “A and/or B” is used to mean at least one of A and B.

In one example embodiment of the present invention, as illustrated inFIG.1, the present invention can be achieved by a recording mode changing device100aconnected to a camera105a. The recording mode changing device100aincludes a determination unit101aand a recording mode changing unit102a.

The determination unit101afunctions as a means configured to determine whether it is necessary to change the data recording mode of a predetermined camera according to the lighting state of the lamp of the predetermined traffic signal. Here, the “data recording mode” refers to various data recording modes that can be accompanied by a change in the amount of data recorded by the camera, such as a change in image quality and a change between a moving image and a still image.

The recording mode changing unit102afunctions as a means configured to change the data recording mode of the predetermined camera according to the determination result by the determination unit101a.

For example, the recording mode changing device100achanges the recording mode by cameras105-1to105-4provided side by side with traffic signals111-1to111-4at the intersections illustrated inFIGS.2and3. For example, when the lights of the traffic signals111-1and111-3are red, the recording mode changing device100achanges the recording mode of the cameras105-1and105-3to a high image quality mode in which imaging is performed with higher image quality than usual. As a result, as illustrated inFIG.2, the camera105-3can capture an image of a vehicle or the like traveling in the intersecting direction of the intersection with high image quality. At this time, since the cameras105-2and105-4perform imaging in a normal mode with lower image quality than the high image quality mode, the amount of image data can be reduced as compared with the case where the entire cameras105-1to105-4are operated in the high image quality mode.

Similarly, when the lights of the traffic signals111-2and111-4are red, the recording mode changing device100achanges the recording mode of the cameras105-2and105-4to a high image quality mode in which imaging is performed with higher image quality than usual. As a result, as illustrated inFIG.3, the camera105-2can capture a vehicle or the like traveling in the intersecting direction of the intersection with high image quality. At this time, since the cameras105-1and105-3perform imaging in a normal mode with lower image quality than the high image quality mode, the amount of image data can be reduced as compared with the case where the entire cameras105-1to105-4are operated in the high image quality mode.

As described above, according to the recording mode changing device of the present example embodiment, it is possible to reduce the amount of image data obtained by a camera or the like installed on the road side or the like, and it is possible to effectively utilize a storage for recording data. By reducing the amount of data, it is also possible to reduce the cost required for data transmission and the load on the network.

In the examples ofFIGS.2and3, the description has been given assuming that the recording mode is changed when the traffic signal is turned on in red, but the timing of changing the recording mode is not limited thereto. For example, the recording mode may be changed at the timing when the traffic signal is turned on in yellow, blue, or green.

In the examples ofFIGS.2and3, an example of changing to the high image quality mode in which imaging is performed with higher image quality than usual has been described as the change in the recording mode, but the mode may be changed to a low image quality mode in which imaging is performed with lower image quality than usual. In this case, in the example ofFIG.2, the cameras105-2and105-4are operated in the low image quality mode. As a result, the images obtained by the cameras105-2and105-4have low image quality. However, regarding the traffic flow flowing between the traffic signals111-2and111-4, since the cameras105-1and105-3perform imaging in the normal mode from the side, image data necessary for image analysis and the like can be obtained from these cameras.

Similarly, in the example ofFIG.3, the cameras105-1and105-3are operated in the low image quality mode. As a result, the images obtained by the cameras105-1and105-3have low image quality. However, since the traffic flow flowing between the traffic signals111-1and111-3is captured in the normal mode from the side by the cameras105-2and105-4, image data necessary for image analysis and the like can be obtained from these cameras.

First Example Embodiment

Next, a first example embodiment of the present invention configured by adding the function of the above-described recording mode changing device to the traffic signal control device will be described in detail with reference to the drawings.FIG.4is a diagram illustrating a system configuration according to the first example embodiment of the present invention. Referring toFIG.4, a traffic signal control device100connected to a camera105, a traffic control center300, and a traffic signal111is shown.

The traffic signal control device100includes a signal control information reception unit101, a capture parameter changing unit102, a camera control unit103, a setting information storage unit104, and a signal control unit110.

The signal control information reception unit101receives signal control information from the traffic control center300, and sends the received signal control information to the signal control unit110and the capture parameter changing unit102.

The signal control unit110controls the traffic signal111on the basis of the signal control information received from the traffic control center300via the signal control information reception unit101. Such a traffic signal111is also referred to as a “centralized controller” in Japan. In a case where a pedestrian traffic signal is provided at an intersection, the signal control unit110also controls the pedestrian traffic signal. The signal control information reception unit101and the signal control unit110described above can use the same configurations as those of the traffic signal control device100installed at an intersection or the like.

The capture parameter changing unit102changes the capture parameter of the camera105on the basis of the setting information read from the setting information storage unit104and the signal control information received from the traffic control center300. Moreover, the capture parameter changing unit102notifies the camera control unit103of the changed capture parameter. Therefore, in the present example embodiment, the capture parameter changing unit102functions as a means configured to determine whether it is necessary to change the data recording mode of the predetermined camera according to the lighting state of the lamp of the predetermined traffic signal.

The setting information storage unit104stores setting information for the capture parameter changing unit102to determine the capture parameter on the basis of the signal control information.FIG.5is a diagram illustrating an example of the setting information stored in the setting information storage unit104.FIG.5illustrates an example of the setting information in a form in which a stage number to be advanced by the signal control information is associated with the capture parameter. A remark column ofFIG.5indicates the lighting state of the signal lamp shown in the camera105. Among them, “all red” indicates a state in which the colors of all the lamps at the intersection are red. For example, in the case of a stage number1, the signal control unit110turns on the traffic signal111(vehicle traffic signal) and the pedestrian traffic signal provided side by side with the traffic signal in green and blue light, respectively. At this time, the capture parameter changing unit102reads a resolution video graphics array (640×480 pixels, also simply noted 480 p) and a frame rate of 30 fps as capture parameters of the camera105, and notifies the camera control unit103of the read parameters.

Thereafter, when the stages move forward and the stage number becomes 4, the signal control unit110turns on the traffic signal111(vehicle traffic signal) in yellow and turns on the pedestrian traffic signal in red. At this time, the capture parameter changing unit102reads the resolution as Full-HD (1920×1080 pixels, also simply noted 1080 p) and the frame rate of 60 fps as the capture parameters of the camera105, and notifies the camera control unit103of the read parameters.

The camera control unit103controls the camera105so that imaging is performed with the capture parameter notified from the capture parameter changing unit102. As a result, the change in the capture parameter in conjunction with the lighting state of the signal lamp is achieved. Therefore, in the present example embodiment, the camera control unit103functions as a means configured to change the data recording mode of the predetermined camera.

The traffic control center300transmits signal control information to the traffic signal control device100to control the traffic signal111. The traffic control center300collects images captured by the camera105and grasps occurrence of traffic congestion and traffic accidents. At that time, since the image captured by the camera105is captured with an appropriate capture parameter according to the lighting state of the lamp, the traffic control center300can perform necessary monitoring and investigation without delay.

The camera105is, for example, a camera installed at a traffic signal or in the vicinity thereof so as to obtain an image in the intersection illustrated inFIGS.2and3. The camera105captures an image under the control of the camera control unit103. In the present specification, “capture” includes capturing of a still image in addition to capturing of a moving image (seeFIG.12and the like).

Next, the operation of the present example embodiment will be described in detail with reference to the drawings.FIG.6is a flowchart illustrating an operation of the traffic signal control device according to the first example embodiment of the present invention. Referring toFIG.6, first, the traffic signal control device100receives the signal control information from the traffic control center300(step S001).

Upon receiving the signal control information, the traffic signal control device100updates the stage number and controls the traffic signal111. Further, the traffic signal control device100reads the capture parameter for the updated stage number from the setting information (step S002).

Next, the traffic signal control device100instructs the camera105to capture an image using the read capture parameter (step S003).

By the above operation, the traffic signal control device100selects the capture parameter according to the state of lighting of the traffic signal, and instructs the camera105to capture an image according to the capture parameter. As a result, it is possible to change at least some of the capture parameters of the image data of the camera105that captures the image in the intersection, and reduce the amount of data. For example, as illustrated inFIG.5, when the signal light is green, the image quality of the image of the camera directed in the same direction as that of the lamp is degraded, so that the data reduction is achieved. On the other hand, when the signal light is other than green, it is possible to finely record the behavior of the vehicle in the direction crossing the camera105by increasing the image quality of the image of the camera directed in the same direction as the lamp.

In the first example embodiment described above, it has been described that the capture parameter is changed according to the stage number. However, regardless of the stage number, the traffic signal control device100may change the capture parameter according to the color of the light recognized from the signal control information.

In the first example embodiment described above, the description has been given assuming that the capture parameter is changed according to the advance of the stage number, but the stages may be further subdivided by time, and the traffic signal control device100may change the capture parameter for each time zone in the subdivided stages.

Further, in the setting information ofFIG.5described above, the capture parameter is set for each combination of the vehicle signal and the pedestrian signal, but setting information that changes the capture parameter according to a change in one of the vehicle signal and the pedestrian signal can also be used. In a case where a signal other than the vehicle signal and the pedestrian signal is present at an intersection or the like, it is also possible to use setting information that changes the capture parameter for each combination with these other signals.

Second Example Embodiment

In the first example embodiment described above, an example in which the traffic signal111is directly controlled by the traffic control center300has been described, but the present invention can also be applied to traffic signals that are not directly controlled by the traffic control center300, for example, traffic signals called constant cycle control signals. Hereinafter, a description will be given regarding a second example embodiment in which the capture parameter is changed according to turning on of a traffic signal which is not directly controlled by the traffic control center300.

FIG.7is a diagram illustrating a system configuration according to a second example embodiment of the present invention. A major difference in configuration from the first example embodiment illustrated inFIG.4is that a traffic signal control device100bcontrols a traffic signal111bwithout being controlled by the traffic control center300. Since the other configurations are similar to those of the first example embodiment, differences thereof will be mainly described below.

A signal control unit110bcontrols the traffic signal111bso as to perform a lighting pattern (also referred to as an indicating configuration) at a preset cycle. The signal control unit110bmay be connected to a sensor (detector; not illustrated) to perform sensitive control of changing a lighting pattern according to the presence or absence of a vehicle or a pedestrian. The control content from the signal control unit110bis also provided to a capture parameter changing unit102b.

The capture parameter changing unit102bchanges the capture parameter of the camera105on the basis of the setting information read from the setting information storage unit104and the signal control information provided from the signal control unit110b. For example, similarly to the first example embodiment, the capture parameter changing unit102bchanges the capture parameter by reading the capture parameter associated to the stage number to be advanced by the signal control information from the setting information.

Since other operations are similar to those of the first example embodiment, the description thereof will be omitted. As described above, according to the configuration of the present example embodiment, it is possible to switch the capture parameter of the camera105that captures an image of an intersection or the like where the traffic signal111bnot controlled by the traffic control center300is installed according to the state of lighting, and perform image capturing.

Third Example Embodiment

In the first and second example embodiments described above, it has been described that the traffic signal control device is connected to the camera105to change the capture parameter, but a case where the traffic signal control device and the camera control device are configured by different devices is also assumed. In that case, it is also assumed that the camera control device cannot receive the signal control information from the traffic signal control device. Hereinafter, a third example embodiment assuming a case where the traffic signal control device and the camera control device are configured by different devices will be described.

FIG.8is a diagram illustrating a system configuration according to the third example embodiment of the present invention. A major difference in configuration from the second example embodiment illustrated inFIG.7is that a traffic signal control device200cand a camera control device100care configured as separate independent devices. Therefore, the camera control device100cincludes a lamp color identification unit106for grasping the lighting state of the lamp of the traffic signal instead of the signal control information.

The traffic signal control device200cis a device that includes a signal control unit210cand controls a traffic signal111cwithout being controlled by the traffic control center300. The signal control unit210cis similar to the signal control unit110bof the second example embodiment, and controls the traffic signal111cso as to perform a lighting pattern (also referred to as an indicating configuration) at a preset cycle.

The camera control device100cincludes a capture parameter changing unit102, a lamp color identification unit106, a camera control unit103c, and a setting information storage unit104c.

In addition to the control of the camera105, the camera control unit103ccan provide an image captured by the camera105to the lamp color identification unit106.

The lamp color identification unit106identifies the lighting state of the lamp of the traffic signal111cfrom the image of the traffic signal111ccaptured in the image provided from the camera control unit103c, and sends the result to the capture parameter changing unit102. Therefore, the lamp color identification unit106functions as a means configured to identify the lighting state of the lamp of the traffic signal from the image of the camera105.

The setting information storage unit104cstores setting information for changing the capture parameter regardless of the signal control information.FIG.9is a diagram illustrating an example of the setting information held in the setting information storage unit104caccording to the present example embodiment. In the example ofFIG.9, an example of setting information in which the lighting pattern of the lamp as the change condition of the capture parameter is associated with the capture parameter to be selected is illustrated.

The capture parameter changing unit102refers to the setting information held in the setting information storage unit104cand selects a capture parameter suitable for the lighting state of the lamp received from the lamp color identification unit106. Moreover, the capture parameter changing unit102notifies the camera control unit103cof the selected capture parameter. For example, when both the vehicle signal is green and the pedestrian signal is blue, the capture parameter changing unit102selects VGA (480 p) and 30 fps as the capture parameters. Then, the camera control unit103cinstructs the camera105to capture an image according to the capture parameter.

Thereafter, when the lighting color of the traffic signal111cchanges, the vehicle signal turns yellow, and the pedestrian signal turns red, the capture parameter changing unit102selects Full-HD (1080 p) and 60 fps as the capture parameters. Then, the camera control unit103cinstructs the camera105to capture an image according to the capture parameter. In the example ofFIG.9, even in a case where both the vehicle signal and the pedestrian signal turn red, imaging with Full-HD (1080 p) and 60 fps is continued, and when the vehicle signal turns green and the pedestrian signal turns blue again, imaging with VGA (480 p) and 30 fps is performed.

As described above, even when the control content of the traffic signal control device200cfor the traffic signal111ccannot be acquired in real time, according to the configuration of the present example embodiment, it is possible to change the capture parameter according to the lighting state of the lamp of the traffic signal similarly to the first and second example embodiments. In the third example embodiment, it has been described that the traffic signal111cis not a direct control target of the traffic control center300, but the traffic signal111cmay be a control target of the traffic control center300. In this case, a control line is added between the traffic control center300and the traffic signal control device200cinFIG.8.

In the example illustrated inFIG.9, the combination of the lighting states of the lamps of the traffic signals and the capture parameter are combined, and the capture parameter is changed when the lighting state of the lamp of the traffic signal becomes a predetermined pattern. However, the change timing of the capture parameter may be shifted by a certain amount. For example, even after the vehicle signal changes to green and the pedestrian signal changes to blue, imaging with the previous capture parameters may be continued for a predetermined period (for example, about several seconds). As a result, it is possible to capture an image of the inside of an intersection in a so-called all-red state with high image quality and record, with high image quality, a vehicle or the like that has ignored a signal or has left for a final departure. In this manner, the data recording mode can be changed at a predetermined timing based on the change in the lighting state of the lamp of the traffic signal.

Fourth Example Embodiment

The signal control device and the camera control device of the first to third example embodiments described above can be integrated with a camera to be configured as a network camera. A fourth example embodiment will be described in detail with reference to the drawings, in which a network camera is provided with a function of changing a capture parameter according to the lighting state of the light of the traffic signal.

FIG.10is a diagram illustrating a system configuration according to the fourth example embodiment of the present invention. Referring toFIG.10, a configuration of a network camera100dincluding a signal control information reception unit101, a capture parameter changing unit102d, a control unit103d, and a setting information storage unit104is illustrated. Since the signal control information reception unit101and the setting information storage unit104are similar to the traffic signal control device100of the first example embodiment, the description thereof will be omitted.

The capture parameter changing unit102dchanges the capture parameter on the basis of the setting information read from the setting information storage unit104and the signal control information received from the traffic control center300. Moreover, the capture parameter changing unit102dnotifies the control unit103dof the changed capture parameter.

The control unit103dcontrols a camera unit105dto perform imaging with the capture parameter notified from the capture parameter changing unit102d.

The camera unit105dis connected to the traffic control center300and provides image data to the traffic control center300.

As described above, the present invention can also be achieved by a single network camera having a function equivalent to that of the traffic signal control device (recording mode changing device) of the first example embodiment. In the example ofFIG.10, it has been described that the network camera100dcan acquire the signal control information transmitted from the traffic control center300to the traffic signal111, but a case where the network camera cannot acquire the signal control information is also assumed. In this case, similarly to the third example embodiment, a lamp color identification unit may be added so that the lighting state of the light of the traffic signal can be grasped by the network camera alone.

In the example ofFIG.10, the network camera100ddirectly transmits image data to the traffic control center300. However, as illustrated inFIG.11, an image recording device108that accumulates image data received from the network camera105dmay be arranged between the network camera100dand the traffic control center300. In this case, the traffic control center300accesses the image recording device108and refers to necessary data.

Although the example embodiments of the present invention have been described above, the present invention is not limited to the above-described example embodiments, and further modifications, substitutions, and adjustments can be made without departing from the basic technical idea of the present invention. For example, the device configuration, the configuration of each element, and the expression form of data and the like illustrated in the drawings are examples for assisting the understanding of the present invention, and are not limited to the configurations illustrated in the drawings. For example, in the first to fourth example embodiments described above, it has been described that the cameras105and105dcapture images in intersections, but the positions of the cameras105and105dare not limited thereto. For example, even in a camera located away from a traffic signal, it may be better to change a data recording mode according to the state of lighting of the traffic signal. For example, there is a case where a camera is installed in a pedestrian crossing located away from a traffic signal, a store facing a road, or a parking lot. The present invention can also be applied to a change in a recording mode for these cameras.

Similarly to the modification of the fourth example embodiment illustrated inFIG.11, also in the configuration illustrated inFIGS.4,7, and8, an image recording device that accumulates image data received from the camera105may be arranged between the camera105and the traffic control center300. In this case, the traffic control center300accesses the image recording device and refers to necessary data.

The camera in the above-described example embodiment may be a camera (traffic flow measuring camera, signal camera) constituting a so-called traffic infrastructure installed in a lamp housing of a traffic signal or attached to the housing as in PTL 1. A mode in which data captured by the camera is transmitted to the traffic control center300via the nearest base station can also be adopted. These base stations may be base stations of long term evolution (LTE) or a fifth generation mobile communication system (5G). Further, these base stations may have functions as the recording mode changing device and the traffic signal control device of the present invention.

In the above-described example embodiment, an example of changing the capture parameter using the setting information has been described. However, the recording mode changing device, the traffic signal control device, and the network camera can change and set the capture parameter from another viewpoint. For example, these devices may change the capture parameters on the basis of the day of the week, the time zone, or the like. In this way, it is possible to appropriately perform monitoring in a time when there are many accidents and a commuting time.

In the above-described example embodiment, it has been described that the image captured by the camera105is transmitted to the traffic control center300, but these devices may transmit image data to other entities. For example, these devices may transmit images or the like recorded by changing capture parameters to a data management system (business operator) that collects, analyzes, and provides traffic-related data. For example, these devices may directly transmit image data to other traffic infrastructure or vehicles.

In each of the above-described example embodiments, an example of changing the capture parameter of the camera105has been described as one of the recording modes. However, the recording mode changing device or the like may change a parameter other than the capture parameter. For example, by using the setting information as illustrated inFIG.12, it is possible to cause the camera105to perform an operation of switching between time-lapse imaging (interval imaging at predetermined intervals of n seconds) and Full-HD imaging.

In each of the above-described example embodiments, it has been described that when the traffic signal111(vehicle traffic signal) is turned on in green light and the pedestrian traffic signal is turned on in blue light, imaging is performed at a low resolution and a low frame rate, but the setting information can be changed according to the purpose of use of the camera and the image data. For example, in a case where the installation purpose of the camera105is reading a license plate or estimating the vehicle type or the attribute of a character, an image facing the front with respect to the camera is more important. As illustrated inFIG.13, the setting information in this case may be a content to be imaged at a high resolution and a high frame rate when the traffic signal111(vehicle traffic signal) is turned on in green light and the pedestrian traffic signal is turned on in blue light.

In each of the above-described example embodiments, an example in which the resolution and the frame rate are changed as the capture parameters of the camera has been described, but the capture parameters of the camera are not limited to these two. For example, a compression rate, a bit rate at the time of encoding, the presence or absence of application of high dynamic range (HDR) processing, the presence or absence of noise reduction processing, the selection of color/monochrome, and the like may be made changeable.

As illustrated inFIG.14, a mode in which a server107such as a mobile edge computing (MEC) server is arranged between the camera and the traffic control center300is also assumed. The present invention can also be applied to such a configuration, and in this case, a capture parameter changing unit102enotifies the server107of the capture parameter. The server107controls the camera using the capture parameter communicated from a traffic signal control device100e. In the configuration illustrated inFIG.14, a mode is also assumed in which the server107re-compresses image data or changes the bit rate of an image to be transmitted to the traffic control center300. By adding the compression rate and the bit rate of the image data as the setting information, it is possible to obtain a configuration that instructs the server107to change the compression rate and the bit rate of the image data according to the lighting state of the lamp of the traffic signal. According to these modes, it is possible to reduce a processing load on the traffic signal control device.

As still another mode, an encoding unit may be disposed in the traffic signal control device, and compression and a bit rate of image data may be changed in the encoding unit. Even in such a configuration, the amount of image data can be reduced similarly to the first to fourth example embodiments. The encoding unit can be achieved not only as a program (software) operating on a computer but also by hardware such as a field-programmable gate array (FPGA).

The procedure in each of the above-described example embodiments can be implemented by a program for causing a computer (9000inFIG.15) that functions as a traffic signal control device, a recording mode changing device, or a network camera to implement functions of these devices. Such a computer is exemplified in a configuration including a central processing unit (CPU)9010, a communication interface9020, a memory9030, and an auxiliary storage device9040inFIG.15. That is, the CPU9010ofFIG.15may execute the capture parameter change program and the camera control program.

That is, each unit (processing means and function) of the traffic signal control device, the recording mode changing device, and the network camera described above can be achieved by a computer program that causes a processor mounted on these devices to execute each processing described above using hardware thereof.

Finally, preferred forms of the present invention are summarized.

[First Aspect]

(See the recording mode changing device from the first viewpoint)

[Second Aspect]

The recording mode changing device described above can adopt a configuration for changing the data recording mode by using the stage information indicating the lighting state of the lamp of the traffic signal.

[Third Aspect]

In the recording mode changing device,it is possible to adopt a configuration in which the data recording mode is changed at a predetermined timing based on a change in a lighting state of a lamp of the traffic signal.
[Fourth Aspect]

In the recording mode changing device,it is possible to adopt a configuration in whichthe predetermined camera is disposed at a position where a lamp of the traffic signal can be captured, andthe recording mode changing device includes:a means configured to identify a lighting state of a lamp of the traffic signal from an image of the camera.
[Fifth Aspect]

In the recording mode changing device,a change in the data recording mode can include a change in at least one of resolution and a frame rate.
[Sixth Aspect]

In the recording mode changing device,a change in the data recording mode can include switching between recording by a moving image and recording by a still image.
[Seventh Aspect]

In the recording mode changing device,it is possible to adopt a configuration in whichthe predetermined camera is a camera installed to capture an intersection, anda data recording mode of the camera is changed according to a lighting state of a lamp of a traffic signal at the intersection.
[Eighth Aspect]

(See the network camera from the second viewpoint)

[Ninth Aspect]

(See the program from the third viewpoint)

[Tenth Aspect]

(See the program from the fourth viewpoint)

The eighth and tenth modes can be developed into the second to seventh modes similarly to the first mode.

The disclosure of the above patent literature is incorporated herein by reference. Within the frame of the entire disclosure (including claims) of the present invention, it is possible to change and adjust the example embodiments or examples further on the basis of the basic technical idea. Various combinations or selections (including partial deletions) of various disclosure elements (each element of each claim, each element of each example embodiment or example, each element of each drawing, and the like are included) can be made within the frame of the disclosure of the present invention. That is, it is a matter of course that the present invention includes various modifications and corrections that can be made by those of ordinary skill in the art in accordance with the entire disclosure including the claims and the technical idea. In particular, for numerical ranges set forth herein, any numerical value or sub-range included within the range should be construed as being specifically described, even if not stated otherwise.

REFERENCE SIGNS LIST

100arecording mode changing device100,100b,100d,100e,200ctraffic signal control device100ccamera control device101signal control information reception unit101adetermination unit102,102b,102d,102ecapture parameter changing unit102arecording mode changing unit103,103ccamera control unit103dcontrol unit104,104csetting information storage unit105,105a,105d,105-1to105-4camera106lamp color identification unit107server108image recording device110,110b,210csignal control unit111,111b,111c,111-1to111-4traffic signal300traffic control center9000computer9010CPU9020communication interface9030memory9040auxiliary storage device