JP6311327B2 - Imaging system and imaging control method - Google Patents

Description

  The present invention relates to an imaging system and an imaging control method.

  Conventionally, in order to confirm the safety of a space used by an unspecified number of people, a camera system that captures and monitors this space with a plurality of cameras is known. For example, at a railway vehicle station or the like, a plurality of cameras are installed under the ceiling of the platform so that the safety of passengers using the railway vehicle can be confirmed.

  In a camera system provided with a plurality of cameras, it is necessary to connect the server and the plurality of cameras in a communicable manner. However, in Patent Document 1, a plurality of cameras are connected in a daisy chain, and the monitoring acquired by each camera is disclosed. A camera system that transmits information to a server via another camera is disclosed.

JP 2012-11989

  By the way, a long and narrow space such as a station platform is not uniform in brightness, and includes a bright space and a dark space. Among multiple cameras connected in a daisy chain, a camera that captures a bright space can capture a clear image, while a camera that captures a dark space can capture a clear image due to insufficient illumination. Can not. In order to capture a dark space, a measure to lower the frame rate can be considered. However, since the image quality deteriorates together with the frame rate, it is not preferable to apply it to a camera system for confirming passenger safety.

  The present invention has been made in view of such problems, and provides a photographing system and a photographing control method capable of improving the image quality of an image photographed by a plurality of photographing devices connected in a daisy chain. Objective.

  In order to solve the above-described problem, in the first aspect of the present invention, a plurality of photographing devices are connected in a daisy chain along a predetermined direction, and a plurality of photographing devices are associated with each of the photographing devices. Provided is an imaging system comprising: an LED illumination group in which LED illumination is daisy-chain connected along the predetermined direction or a direction substantially parallel to the predetermined direction; and a control device that controls the imaging device group and the LED illumination group. To do. In the above imaging system, the control device has a measuring unit that measures the brightness of a predetermined area in an image captured by each of the imaging devices, and the brightness is within a predetermined range for each of the captured images. And a control unit that controls a lighting state of the LED illumination corresponding to the imaging device that has captured an image whose brightness is outside a predetermined range.

  In the above imaging system, a plurality of the LED illuminations are associated with an imaging device, and the measurement unit includes brightness of an upstream area that is a predetermined area upstream in the predetermined direction in the image, And measuring at least the brightness of a downstream area, which is a predetermined area downstream of the predetermined direction, and the control unit corresponds to a photographing apparatus that has captured the image when the brightness of the upstream area is out of a predetermined range. When the lighting state of the LED illumination located upstream in the predetermined direction is controlled among the plurality of LED illuminations, and the brightness of the downstream region is outside the predetermined range, the plurality of LED illuminations corresponding to the imaging device that captured this image It is good also as controlling the lighting state of LED lighting located in the downstream of the said predetermined direction among LED lighting.

  In the imaging system, the control unit may control the lighting state of the LED illumination so that the imaging timing of the imaging device and the light emission timing of the LED illumination corresponding to the imaging device are synchronized. .

  The imaging system described above is relative to the imaging device, in the predetermined direction or in a direction substantially parallel to the predetermined direction, relative to the imaging device and the first LED illumination positioned relatively upstream from the imaging device. The second LED illumination located downstream is associated with the control unit, and the control unit emits the first LED illumination and the second LED illumination with different light emission amounts at a timing synchronized with the imaging timing of the imaging device. It is good also as controlling a lighting state like this.

  In the photographing system, the control unit controls the lighting state so that the light emission amount of the second LED illumination is larger than the light emission amount of the first LED illumination at the first photographing timing, and at the second photographing timing, The lighting state may be controlled so that the light emission amount of the first LED illumination is larger than the light emission amount of the second LED illumination.

  In the imaging system, the LED illumination group includes the first LED illumination, the second LED illumination, and a third LED illumination positioned between the first LED illumination and the second LED illumination, and the control unit includes: The lighting state of the third LED illumination may be controlled at a light emission timing unrelated to the imaging timing of the imaging device corresponding to the first LED illumination and the second LED illumination.

  In the second aspect of the present invention, a group of imaging devices in which a plurality of imaging devices are connected in a daisy chain along a predetermined direction, and a plurality of LED illuminations associated with each of the imaging devices are in the predetermined direction or the A step of measuring the brightness of a predetermined area in an image captured by each of the imaging devices, which is executed by a computer that controls a group of LED illuminations connected in a daisy chain along a direction substantially parallel to the predetermined direction; A step of determining whether or not the brightness is within a predetermined range for each of the captured images, and a lighting state of the LED illumination corresponding to the imaging device that has captured an image whose brightness is outside the predetermined range And a step of controlling.

  According to the present invention, it is possible to improve the image quality of an image captured by a plurality of imaging devices connected in a daisy chain.

It is a figure which shows the structural example of the imaging | photography system which concerns on 1st Embodiment. It is a figure which shows an example of the usage condition of an imaging | photography system. It is a figure which shows the example of installation of the imaging device in a station platform. It is a figure which shows the example of installation of the imaging device in a station platform. It is a block diagram which shows the function structure of a data management apparatus. It is a figure which shows the example of control of the lighting state by a data management apparatus. It is a figure which shows the example of control of the lighting state by a data management apparatus. It is a flowchart which shows the flow of a process of an imaging | photography system. It is a figure which shows the operation example of the imaging | photography system which concerns on 2nd Embodiment. It is a figure which shows the structural example of an imaging device group and LED illumination group. It is a timing chart which shows the relationship between the imaging | photography timing of an imaging device group, and the light emission timing of a LED illumination group. It is a figure which shows the example of control of the lighting state by a data management apparatus.

<First Embodiment>
First, a first embodiment of the photographing system 10 of the present invention will be described with reference to FIGS.

[Overall Configuration of Shooting System 10]
FIG. 1 is a diagram illustrating an overall configuration of the imaging system 10 according to the first embodiment, FIG. 2 is a diagram illustrating an example of a usage mode of the imaging system 10, and FIGS. It is a figure which shows the example of installation in the platform of the station of the LED illumination 111. FIG. 3A is a view of the station platform viewed from the traveling direction of the railway vehicle, and FIG. 3B is a view of the station platform viewed from a direction orthogonal to the traveling direction of the railway vehicle.

As shown in FIG. 1, the imaging system 10 includes an imaging device group 100, an LED illumination group 110, and a data management device 200 that is communicably connected to the imaging device group 100 and the LED illumination group 110. The
The imaging system 10 may include a hub 300 between the data management device 200, the imaging device group 100, and the LED illumination group 110, and the imaging device group 100 and the LED illumination group 110 connected to the hub 300. A plurality of may be provided. In this case, for example, each of the photographing device group 100 and the LED illumination group 110 may be installed on each of a plurality of platforms at a station. The imaging system 10 may also include a monitor 400 that displays an image captured by the imaging device group 100.

  In the imaging device group 100, a plurality of imaging devices 101 (imaging device 101-1, imaging device 101-2... Imaging device 101-n, where n is a natural number of 3 or more) are connected in a daisy chain along a predetermined direction. Configured. As shown in FIG. 3B, in the present embodiment, the plurality of imaging devices 101 are daisy chain connected along the length direction (A to B) of the platform P of the station.

The imaging device 101 is a stereo camera having two imaging elements, and the imaging range R of each imaging device 101 overlaps the imaging range R of the adjacent imaging device 101 on the upper part (ceiling) of the station platform P. It is installed (see FIG. 3B etc.).
The imaging device 101 captures, for example, a bird's-eye view of a door peripheral image including a door of a railway vehicle stopped at a station. The door peripheral image includes an image of passengers waiting for the railway vehicle and the platform P, and a part of the railway vehicle around the door. In the monitor 400 shown in FIG. 2, a door peripheral image including a door of a railway vehicle stopped at a station and passengers around the door is displayed. The door peripheral image photographed by the photographing apparatus 101 is transmitted to the data management apparatus 200 via a predetermined communication line.

  The LED illumination group 110 includes a plurality of LED illuminations 111 (LED illumination 111-1, LED illumination 111-2... LED illumination 111-n, where n is a natural number of 3 or more) associated with each of the imaging devices 101. Are configured in a daisy chain connection. The plurality of LED lights 111 are connected in a daisy chain along the length direction (A to B) of the platform P of the station, similarly to the photographing apparatus 101. That is, the plurality of LED lights 111 are daisy chain connected along a predetermined direction or a direction substantially parallel to the predetermined direction.

As shown in FIG. 3A, the LED lighting 111 is attached to the upper part (ceiling) of the platform P of the station and illuminates the platform P. When the LED illumination 111 illuminates the platform P, the brightness of an image photographed by the photographing apparatus 101 increases.
Note that the correspondence between the imaging device 101 and the LED illumination 111 is arbitrary, and a plurality of LED illuminations 111 may be associated with a single imaging device 101, and a single LED illumination 111 is a plurality of imaging. It may be associated with the device 101. However, the corresponding imaging device 101 and the LED illumination 111 are installed at positions in the vicinity in the length direction of the platform P of the station.

[Functional Configuration of Data Management Device 200]
FIG. 4 is a block diagram illustrating a functional configuration of the data management apparatus 200. The data management apparatus 200 includes a measurement unit 201, a determination unit 202, a control unit 203, and a storage unit 204.
Note that each of the plurality of imaging devices 101 may have a function of one of the measurement unit 201 to the storage unit 204 included in the data management device 200. In other words, the control device (computer) of the present invention may be realized by the data management device 200, or may be realized by each of the plurality of imaging devices 101. It may be realized by each of the plurality of photographing apparatuses 101.

The storage unit 204 stores a door peripheral image photographed by each of the plurality of photographing devices 101 constituting the photographing device group 100.
The measurement unit 201 measures the brightness of a predetermined area in the door peripheral image captured by each of the imaging devices 101 stored in the storage unit 204. The predetermined area can be arbitrarily set, and may be the entire area of the door peripheral image or a partial area of the door peripheral image.

  The determination unit 202 determines whether or not the brightness is within a predetermined range for each of the captured door periphery images. That is, the determination unit 202 determines that the brightness is within a predetermined range when the door peripheral image has an appropriate brightness, and the brightness is determined when the door peripheral image is too bright and the door peripheral image is too dark. Is determined to be outside the predetermined range.

  The control unit 203 controls the lighting state of the LED illumination 111 corresponding to the imaging device 101 that has captured the door peripheral image whose brightness is outside the predetermined range. Although details will be described later, when the lightness is lower than a predetermined range, the control unit 203 increases the light emission amount of the LED illumination 111 corresponding to the photographing device 101 that has photographed the door peripheral image, and photographing by the photographing device 101 is performed. Increase illumination in range R. On the contrary, when the brightness is higher than the predetermined range, the control unit 203 reduces the light emission amount of the LED illumination 111 corresponding to the photographing device 101 that photographed the door peripheral image, and the photographing range R of the photographing device 101 is illuminated. To weaken.

  Thereby, in the dark space of the platform P of the station where the brightness is not uniform, the light emission amount of the LED illumination 111 is increased, so that the brightness of the door peripheral image captured by the photographing apparatus 101 is also increased, and a clear door peripheral image is obtained. Can be taken. On the other hand, in the bright space of the platform P of the station, sufficient brightness has already been secured, so by reducing the amount of light emitted from the LED illumination 111, it is possible to capture a clear image around the door while suppressing power consumption. it can.

[Control Example of LED Illumination 111 by Control Unit 203]
Next, a control example of the lighting state of the LED illumination 111 by the control unit 203 will be described with reference to FIGS. 5 and 6.

[Control Example 1]
FIGS. 5A1 and 5A2 show examples of door peripheral images 301 and 302 including a door of a railway vehicle and passengers in and around the door. 5A1 is a door peripheral image whose brightness is lower than a predetermined range, and a door peripheral image 302 of FIG. 5A2 is a door peripheral image whose brightness is within a predetermined range. .
5B1 is a timing chart showing the relationship between the photographing timing of the photographing apparatus 101 when the door peripheral image 301 is photographed and the light emission timing of the LED illumination 111, and FIG. 4 is a timing chart showing the relationship between the photographing timing of the photographing apparatus 101 and the light emission timing of the LED illumination 111 when the image 302 is photographed.

In the door peripheral image 301 shown in FIG. 5A1, the brightness is lower than the predetermined range. Therefore, the control unit 203 increases the light emission amount of the LED illumination 111 corresponding to the imaging device 101 that has captured the door peripheral image 301.
That is, in the example shown in FIG. 5B1, the light emission period of the LED illumination 111 is shorter than the period during which the image sensor of the image capturing apparatus 101 is exposed, and the image capture timing and the light emission timing of the LED illumination 111 are not synchronized. . On the other hand, in the example shown in FIG. 5 (B2), the photographing timing of the photographing apparatus 101 and the light emission timing of the LED illumination 111 are synchronized, and the photographing period and the light emission period are made equal to each other. The amount of luminescence is increased. As a result, as shown in FIG. 5 (A2), the brightness of the door periphery image 302 to be photographed falls within a predetermined range, and a clear door periphery image is photographed even when photographing a dark space of the platform P of the station. can do.

  In the example illustrated in FIG. 5, the light emission amount of the LED illumination 111 is increased by increasing the light emission timing of the LED illumination 111. In this regard, the method of increasing the light emission amount of the LED illumination 111 is arbitrary. For example, the light emission amount of the LED illumination 111 may be increased by increasing the current flowing through the LED element of the LED illumination 111. In addition, the LED illumination 111 may always synchronize the photographing timing and the light emission timing in the relationship with the corresponding photographing apparatus 101, and adjust the amount of light emission by adjusting the current flowing through the LED element. Good.

In addition, the synchronization between the photographing timing and the light emission timing may be realized by an arbitrary method. For example, it may be realized by transmitting a synchronization signal from the photographing apparatus 101 to the corresponding LED illumination 111. This may be realized by transmitting a synchronization signal from the data management device 200 to the photographing device 101 and the LED illumination 111.
In the present embodiment, that the photographing timing and the light emission timing are synchronized means that there is a predetermined relationship between the period during which the image sensor of the photographing apparatus 101 is exposed and the period during which the LED illumination 111 emits light. The state in which the photographing timing and the light emission timing are synchronized is, for example, a state in which the period during which the image sensor is exposed is included in the period during which the LED illumination 111 emits light.

[Control Example 2]
In the example illustrated in FIG. 5, the control example in the case where the brightness is outside the predetermined range in all the regions of the door peripheral image is illustrated. Next, with reference to FIG. 6, an example of control when the brightness is outside a predetermined range in a partial region of the door peripheral image will be described.

  When photographing a door peripheral image of a railway vehicle that stops on the platform P in the photographing device group 100 arranged in the length direction of the platform P, the horizontal direction of the door peripheral image coincides with the length direction of the platform P. In the control example 2, the LED illumination group 110 arranged along the length direction of the platform P is controlled based on the brightness of a plurality of areas obtained by dividing the door peripheral image along the horizontal direction.

As shown in FIG. 6 (B1), with respect to one photographing apparatus 101, an LED illumination 111a located on the upstream side in the longitudinal direction of the platform P, an LED illumination 111b located on the downstream side of the LED illumination 111a, and The three LED illuminations 111 of the LED illumination 111c located on the downstream side of the LED illumination 111b are associated with each other.
In this case, as shown in FIG. 6A1, the door peripheral image 311 photographed by the photographing apparatus 101 is divided into three areas of an upstream area 321, a midstream area 322, and a downstream area 323 along the horizontal direction. The three upstream regions 321, the midstream region 322, and the downstream region 323 correspond to the LED illumination 111a, the LED illumination 111b, and the LED illumination 111c based on the positional relationship, and the control unit 203 controls the upstream region 321 to the downstream region 323. The lighting states of the LED lighting 111a to the LED lighting 111c are controlled based on the brightness.

  Specifically, as illustrated in FIG. 6A2, the brightness of the upstream region 321 is lower than a predetermined range in the door peripheral image 312 captured by the imaging apparatus 101. At this time, as shown in FIG. 6 (B2), the LED illuminations 111a to 111c corresponding to the imaging device 101 are lit in a predetermined manner.

  Then, as illustrated in FIG. 6 (B3), the control unit 203 increases the light emission amount of the LED illumination 111a corresponding to the upstream region 321 whose brightness is lower than the predetermined range. Accordingly, as shown in FIG. 6 (A3), even when the brightness of the upstream area 321 of the door peripheral image 313 falls within a predetermined range, and there is a dark space in a part of the shooting range R of the shooting apparatus 101. A clear door periphery image is taken.

[Processing of Imaging System 10]
Next, with reference to FIG. 7, a processing flow of the imaging system 10 of the present invention will be described.
First, the photographing apparatus 101 determines whether or not it is a photographing timing (step S1), and waits until the photographing timing is reached. When it is a photographing timing, the LED illumination 111 is turned on at a timing synchronized with the photographing timing of the photographing device 101 having a correspondence relationship (step S2), and illuminates the photographing range R of the photographing device 101.

  Subsequently, the door peripheral image photographed by the photographing apparatus 101 is transmitted from the photographing apparatus 101 to the data management apparatus 200 and stored in the storage unit 204 of the data management apparatus 200 (step S3). In the data management device 200, the measurement unit 201 analyzes the stored door peripheral image and measures the brightness of a predetermined area of the door peripheral image (step S4).

  Subsequently, the determination unit 202 of the data management device 200 determines whether or not the brightness of the predetermined area of the door peripheral image is within a predetermined range (step S5). If the lightness is within the predetermined range, the process proceeds to step S1, and the photographing of the door peripheral image is performed by the photographing device 101.

  On the other hand, when the brightness is outside the predetermined range, the determination unit 202 of the data management apparatus 200 determines whether the area where the brightness is outside the predetermined range is the upstream area of the door peripheral image (step S6). At this time, when the brightness of the upstream area of the door peripheral image is outside the predetermined range, the control unit 203 of the data management apparatus 200 is upstream of the LED illumination 111 corresponding to the photographing apparatus 101 that captured the door peripheral image. The light emission amount of the LED illumination 111 located, that is, the LED illumination 111 corresponding to the upstream region is adjusted, and the brightness of the upstream region is adjusted (step S7).

  In subsequent step S8, the determination unit 202 of the data management apparatus 200 determines whether or not the area where the brightness is outside the predetermined range is the downstream area of the door peripheral image. At this time, if the brightness of the downstream area of the door peripheral image is outside the predetermined range, the control unit 203 of the data management device 200 is located downstream of the LED illumination 111 corresponding to the imaging device 101 that captured the door peripheral image. The light emission amount of the LED illumination 111 located, that is, the LED illumination 111 corresponding to the downstream region is adjusted, and the brightness of the upstream region is adjusted (step S9).

  Subsequently, in step S10, the determination unit 202 of the data management apparatus 200 determines whether or not the area where the brightness is outside the predetermined range is the middle area of the door peripheral image. At this time, when the brightness of the middle area of the door peripheral image is outside the predetermined range, the control unit 203 of the data management apparatus 200 takes the middle part of the LED illumination 111 corresponding to the photographing apparatus 101 that captured the door peripheral image. The light emission amount of the LED illumination 111 positioned, that is, the LED illumination 111 corresponding to the midstream region is adjusted, and the brightness of the midstream region is adjusted (step S9). Thereafter, the process proceeds to step S1, and the photographing of the door peripheral image is performed by the photographing apparatus 101.

[Effects of the photographing system 10 of the first embodiment]
The first embodiment of the imaging system 10 of the present invention has been described above. Next, effects in the imaging system 10 will be described.

In the imaging system 10 of the present invention, when the imaging apparatus 101 captures an elongated space such as a platform P of a station with uneven brightness, the illuminance of the imaging range R is adjusted using the LED illumination 111. That is, in the imaging system 10, the plurality of imaging apparatuses 101 and the plurality of LED lights 111 are connected in a daisy chain along the length direction of the platform P of the station, and the situation of the platform P is imaged. At this time, the LED lighting 111 is associated with the photographing apparatus 101, and when the brightness of the door peripheral image photographed by the photographing apparatus 101 is outside a predetermined range, the LED illumination 111 corresponding to the photographing apparatus 101 emits light. The amount is adjusted.
As a result, the amount of light emitted by the LED illumination 111 increases around the photographing apparatus 101 that captures a dark space. Therefore, the photographing apparatus 101 can capture a clear image without reducing the image quality by reducing the frame rate or the like. Can do. In addition, since the amount of light emitted by the LED illumination 111 decreases around the photographing apparatus 101 that captures a bright space, power consumption can be suppressed, which is preferable in terms of energy saving. As a result, in the photographing system 10 of the present invention, the image quality of the door peripheral image photographed by the plurality of photographing devices 101 connected in a daisy chain can be improved.

Further, in the photographing system 10 of the present invention, a region where the brightness is outside the predetermined range in the door peripheral image is specified, and the light emission amount of the LED illumination 111 corresponding to this region is adjusted. Specifically, the door periphery image is divided into an upstream region and a downstream region along the LED illumination 111, and the light emission of the upstream LED illumination 111 is performed when the brightness of the upstream region of the door periphery image is outside a predetermined range. When the brightness of the downstream area of the door peripheral image is outside the predetermined range, the light emission amount of the downstream LED illumination 111 is adjusted.
Thereby, even when there is a dark space in a part of the photographing range R of the photographing apparatus 101, a clear door peripheral image can be photographed.

  In the photographing system 10 of the present invention, the LED illumination 111 is lit in synchronization with the photographing timing of the photographing apparatus 101. Accordingly, a clear image around the door can be taken even when the LED illumination 111 that must blink at high speed is used due to its characteristics.

Second Embodiment
Next, the imaging system 10 according to the second embodiment will be described with reference to FIGS. In the imaging system 10 for monitoring the platform P, it is necessary to appropriately capture that the passenger has fallen from the platform P onto the track. Usually, such fall determination is performed by edge detection using parallax of a stereo camera. The imaging system 10 of the second embodiment is characterized in that this edge detection is suitably performed.

  When the illumination is applied from the front in the imaging direction, the edge of the imaging object becomes ambiguous, and when the illumination is applied from the side in the imaging direction, the edge of the imaging object is emphasized. In the photographing system 10 of the second embodiment, the photographing range R is set by illuminating from the side in the photographing direction, that is, using the LED illumination 111 positioned relatively upstream or downstream with respect to the photographing device 101. By illuminating, the edge of the object in the door peripheral image is emphasized.

  This point will be specifically described with reference to FIG. The LED illumination 111a is an LED illumination 111 that is positioned relatively upstream in the length direction of the platform P with respect to the photographing apparatus 101, and the LED illumination 111c is in the length direction of the platform P with respect to the photographing apparatus 101. LED illumination 111 is located relatively downstream. In the example shown in FIG. 8, the light emission amount of the downstream LED illumination 111c is increased from the light emission amount of the upstream LED illumination 111a. Thereby, the edge of the object in the door periphery image 331 image | photographed with the imaging device 101 is emphasized. In the example shown in FIG. 8, the edge E of the head part of the railway vehicle is emphasized.

  Here, the plurality of imaging devices 101 and the LED lighting 111 are continuously installed in a daisy chain. Therefore, the LED illumination 111 positioned on the upstream side with respect to the imaging apparatus 101 may be positioned on the downstream side with respect to the other imaging apparatus 101, or may be positioned on the front side with respect to the other imaging apparatus 101. There is also.

Therefore, in the imaging system 10 of the second embodiment, the plurality of imaging devices 101 are divided into a first imaging device group and a second imaging device group, and similarly, the plurality of LED illuminations 111 are replaced with the first LED illumination group and the second LED illumination. Divide into groups. In the example shown in FIG. 9A, the imaging devices 101b and 101d are the first imaging device group, the imaging devices 101a, 101c, and 101e are the second imaging device group, the LED illuminations 111a, 111c, and 111e are the first LED illumination group, and the LED The illuminations 111b and 111d are a second LED illumination group.
The LED illumination 111 included in the first LED illumination group is positioned relatively upstream or downstream in the length direction of the platform P with respect to the imaging device 101 included in the first imaging device group. The LED illumination 111 included in the second LED illumination group is an LED illumination that is positioned relatively upstream or downstream in the length direction of the platform P with respect to the imaging device 101 included in the second imaging device group. 111.

Then, as shown in FIG. 9B, the control unit 203 of the imaging system 10 of the second embodiment causes the LED illumination included in the first LED illumination group to emit light at a timing synchronized with the imaging timing of the first imaging device group. The lighting state of the LED illumination 111 included in the second LED illumination group is controlled such that the lighting state of the 111 LED is controlled and light is emitted at a timing synchronized with the imaging timing of the second imaging device group.
Accordingly, the LED illumination 111 positioned on the upstream side or the downstream side relative to the photographing apparatus 101 emits light in synchronization with the photographing timing of the photographing apparatus 101, so that the edge of the object in the door peripheral image is emphasized. Is done.

Note that the control unit 203 has an LED illumination 111 whose relative positional relationship with the imaging device 101 is approximate, that is, between the LED illumination 111 located on the upstream side of the imaging device 101 and the LED illumination 111 located on the downstream side. As for the LED illumination 111 positioned at, the lighting state may be controlled at a light emission timing unrelated to the photographing timing of the photographing apparatus 101.
In the example shown in FIG. 9B, the lighting state of the second LED illumination group is controlled at a light emission timing unrelated to the imaging timing of the first imaging device group.

  As described above, the LED illumination 111 located on the upstream side or the downstream side emits light at the photographing timing of the photographing apparatus 101. However, the light emission amount of the upstream LED illumination 111 is different from the light emission amount of the downstream LED illumination 111. In some cases, the edge can be further emphasized. Therefore, the control unit 203 of the second embodiment may control the lighting state so that the upstream LED illumination 111 and the downstream LED illumination 111 emit light with different light emission amounts.

At this time, in the imaging system 10 in which the plurality of imaging apparatuses 101 and the LED illuminations 111 are connected in a daisy chain, there are a plurality of correspondence relationships between the imaging apparatus 101 and the upstream and downstream LED illuminations 111. It is preferable to appropriately switch the LED illumination 111 that increases the amount of light on the upstream side and the downstream side.
That is, as illustrated in FIG. 10, the control unit 203 determines the light emission amount of the LED illumination 111a positioned relatively upstream from the imaging device 101b at the first imaging timing T1-T2 of the first imaging device group. On the other hand, the LED illumination 111c located relatively downstream from the photographing apparatus 101 is turned off. On the other hand, at the second imaging timing T5-T6 of the first imaging device group, the control unit 203 increases the light emission amount of the LED illumination 111c located on the downstream side of the imaging device 101b, while on the other hand, than the imaging device 101b. The upstream LED illumination 111a is turned off.

  Thereby, since the consumption degree of the LED illumination 111 is made uniform by the plurality of LED illuminations 111, the edge of the object in the door peripheral image can be emphasized while suppressing the consumption of the LED illumination 111.

[Effects of the photographing system 10 of the second embodiment]
The second embodiment of the imaging system 10 of the present invention has been described above. The imaging system 10 according to the second embodiment has the following effects.

In the imaging system 10 of the second embodiment, the LED illumination 111 positioned relatively upstream of the imaging device 101 in the longitudinal direction of the platform P with respect to the imaging device 101 and the imaging device 101 are relatively relative to the imaging device 101. Is associated with the LED illumination 111 positioned downstream, and the upstream and downstream LED illuminations 111 are caused to emit light at a timing synchronized with the imaging timing of the imaging apparatus 101. Thereby, since the illumination is applied not from the front side in the shooting direction but from the side surface in the shooting direction, the edge of the shooting target is emphasized. As a result, the edge detection can be performed appropriately, and the abnormality of the platform P can be detected at an early stage.
At this time, in the imaging system 10 of the second embodiment, the lighting state of the LED illumination 111 is controlled so that the upstream LED illumination 111 and the downstream LED illumination 111 emit light with different light emission amounts. The edge can be emphasized more.

  In the imaging system 10 of the second embodiment, the LED illumination 111 that increases the amount of light emission is switched between the upstream side and the downstream side in accordance with the imaging timing of the imaging apparatus 101. Accordingly, the degree of consumption of the LED illumination 111 can be made uniform, and the edge of the imaging target can be emphasized while suppressing the consumption of the LED illumination 111.

  In the imaging system 10 of the second embodiment, the LED illumination 111 positioned between the upstream LED illumination 111 and the downstream LED illumination 111 has a light emission timing that is not related to the imaging timing of the imaging apparatus 101. The lighting state is controlled. As a result, the LED illumination 111 positioned between the upstream LED illumination 111 and the downstream LED illumination 111 can flicker at an interval shorter than the exposure time of the photographing apparatus 101, so that the LED elements are consumed. Can be suppressed.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. It is apparent from the description of the scope of claims that embodiments with such changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Shooting system, 100 ... Shooting device group, 101 ... Shooting device, 110 ... LED illumination group, 111 ... LED illumination, 200 ... Data management device, 201 ... Measurement , 202 ... determination unit, 203 ... control unit, 204 ... storage unit, 300 ... hub, 400 ... monitor

Claims (7)

A group of imaging devices in which a plurality of imaging devices are connected in a daisy chain along a predetermined direction, and a plurality of LED illuminations associated with each of the imaging devices are along the predetermined direction or a direction substantially parallel to the predetermined direction. Daisy-chain connected LED illumination group, and a photographing system comprising the photographing device group and a control device for controlling the LED illumination group,
The controller is
A measurement unit for measuring the brightness of a predetermined area in an image photographed by each of the photographing devices;
A determination unit that determines whether or not the lightness is within a predetermined range for each of the captured images;
A control unit for controlling a lighting state of the LED illumination corresponding to the imaging apparatus that has captured an image whose brightness is outside a predetermined range;
Equipped with a,
Wherein the control unit includes a photographing timing of the imaging device, so that the emission timing of the LED lighting corresponding to the imaging device is synchronized, the imaging system that controls the lighting state of the LED lighting. A group of imaging devices in which a plurality of imaging devices are connected in a daisy chain along a predetermined direction, and a plurality of LED illuminations associated with each of the imaging devices are along the predetermined direction or a direction substantially parallel to the predetermined direction. Daisy-chain connected LED illumination group, and a photographing system comprising the photographing device group and a control device for controlling the LED illumination group,
The controller is
A measurement unit for measuring the brightness of a predetermined area in an image photographed by each of the photographing devices;
A determination unit that determines whether or not the lightness is within a predetermined range for each of the captured images;
A control unit for controlling a lighting state of the LED illumination corresponding to the imaging apparatus that has captured an image whose brightness is outside a predetermined range;
Equipped with a,
A plurality of the LED lights are associated with the imaging device,
The measurement unit measures at least the brightness of an upstream region that is a predetermined region upstream of the predetermined direction in the image and the brightness of a downstream region that is a predetermined region downstream of the predetermined direction in the image. And
The controller is
When the brightness of the upstream region is outside the predetermined range, the lighting state of the LED illumination located upstream in the predetermined direction among the plurality of LED illuminations corresponding to the imaging device that captured the image is controlled,
An imaging system that controls a lighting state of an LED illumination located downstream in the predetermined direction among a plurality of LED illuminations corresponding to an imaging device that has captured the image when the brightness of the downstream region is outside a predetermined range . A first LED illumination located relatively upstream of the photographing device and a position relatively downstream of the photographing device in the predetermined direction or a direction substantially parallel to the predetermined direction with respect to the photographing device. A second LED illumination,
The control unit controls the lighting state so that the first LED illumination and the second LED illumination emit light with different light emission amounts at a timing synchronized with a photographing timing of the photographing device.
The imaging system according to claim 1 or 2. The control unit controls the lighting state so that the light emission amount of the second LED illumination is larger than the light emission amount of the first LED illumination at the first photographing timing, and the light emission of the second LED illumination at the second photographing timing. Controlling the lighting state so that the light emission amount of the first LED illumination is larger than the amount,
The imaging system according to claim 3 . The LED illumination group includes the first LED illumination, the second LED illumination, and a third LED illumination located between the first LED illumination and the second LED illumination,
The control unit controls the lighting state of the third LED illumination at a light emission timing unrelated to the imaging timing of the imaging device corresponding to the first LED illumination and the second LED illumination.
The imaging system according to claim 3 or 4 . A group of imaging devices in which a plurality of imaging devices are connected in a daisy chain along a predetermined direction, and a plurality of LED illuminations associated with each of the imaging devices are along the predetermined direction or a direction substantially parallel to the predetermined direction. A computer that controls a group of LED lights connected in a daisy chain;
Measuring the brightness of a predetermined area in an image photographed by each of the photographing devices;
Determining whether the brightness is within a predetermined range for each of the captured images;
The lighting state of the LED lighting corresponding to the photographing device that has photographed the image whose brightness is outside the predetermined range so that the photographing timing of the photographing device and the light emission timing of the LED lighting corresponding to the photographing device are synchronized. A step of controlling
Including a shooting control method. A group of photographing devices in which a plurality of photographing devices are connected in a daisy chain along a predetermined direction, and a plurality of LED lights associated with the photographing devices are daisy chained along the predetermined direction or a direction substantially parallel to the predetermined direction. A computer that controls the connected LED lighting groups;
Brightness of an upstream region that is a predetermined region upstream in the predetermined direction in the image captured by each of the imaging devices, and brightness of a downstream region that is a predetermined region downstream in the predetermined direction in the image; Measuring at least
Determining whether the brightness is within a predetermined range for each of the captured images;
When the brightness of the upstream region is outside a predetermined range, the lighting state of the LED illumination located on the upstream side in the predetermined direction is controlled among the plurality of LED illuminations corresponding to the imaging device that captured the image, and the downstream region If the brightness of the LED is out of the predetermined range, the step of controlling the lighting state of the LED lighting located on the downstream side of the predetermined direction among the plurality of LED lighting corresponding to the imaging device that took this image;
Including a shooting control method.

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