KR20170044561A - Guide image providing system using hologram - Google Patents

Guide image providing system using hologram Download PDF

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Publication number
KR20170044561A
KR20170044561A KR1020150144385A KR20150144385A KR20170044561A KR 20170044561 A KR20170044561 A KR 20170044561A KR 1020150144385 A KR1020150144385 A KR 1020150144385A KR 20150144385 A KR20150144385 A KR 20150144385A KR 20170044561 A KR20170044561 A KR 20170044561A
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KR
South Korea
Prior art keywords
laser
image
hologram
unit
screen
Prior art date
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KR1020150144385A
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Korean (ko)
Inventor
오인선
Original Assignee
주식회사 숨비
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Priority to KR1020150144385A priority Critical patent/KR20170044561A/en
Publication of KR20170044561A publication Critical patent/KR20170044561A/en

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04—Processes or apparatus for producing holograms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04—Processes or apparatus for producing holograms
    • G03H1/0402—Recording geometries or arrangements
    • G03H1/0406—Image plane or focused image holograms, i.e. an image of the object or holobject is formed on, in or across the recording plane
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/0005—Adaptation of holography to specific applications
    • G03H2001/0055—Adaptation of holography to specific applications in advertising or decorative art

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Road Signs Or Road Markings (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)
  • Holo Graphy (AREA)

Abstract

According to an aspect of the present invention, there is provided an image providing system for providing a three-dimensional guide image using a hologram, the image providing system comprising: a light source for emitting a laser toward an opposite side portion, A screen generating unit 110 for forming a laser screen 111 of the LCD device; A plurality of laser screens 111 are arranged at predetermined intervals along a longitudinal direction of the laser screen 111 and output a hologram image toward a side surface of the laser screen 111 to display a stereoscopic image 121, ); And a control unit (130) for driving and controlling the screen generating unit (110) and the hologram output unit (120) so that a guide image (121) having a guidance content designated according to setting items is displayed .

Description

[0001] GUIDE IMAGE PROVIDING SYSTEM USING HOLOGRAM [0002]

The present invention relates to an image providing system using a hologram, and more particularly, to an image providing system using a hologram, and more particularly, to an image providing system using a hologram, The present invention relates to a video providing system using a hologram for providing a guidance image useful for a driver or a pedestrian by displaying guidance contents such as signboards.

Generally, in a road or a building, a banner is used as a means of advertising or guidance to pedestrians or drivers, or a large advertising signboard and signboard are used. In the case of a banner, the visibility is reduced because the image is printed on the fabric However, there was a need to replace the banners every time the advertisements and guidance contents were changed.

In addition, in the case of an advertising signboard or a signboard, since the installation scale is large, manufacturing and installation costs are excessively high, and a lamp having a large power consumption is continuously driven to increase visibility.

On the other hand, on the road where the crosswalk is installed, the driver recognizes the lighting state of the driver's signal lamp arranged horizontally over the roadway, and stops or starts the vehicle. Further, in the case of an operator signal lamp, it is installed at a high position so as to be identifiable even at a distance distant from the crosswalk.

However, since the driver's signal lamp is installed at a high position as described above, when the vehicle approaches the traffic light, it is difficult to visually recognize the lighting state. The light of the driver's traffic light of the driving lane, the stop light of the preceding vehicle, There is a problem that the visibility is lowered due to the interference of the lights. In addition, pedestrians are exposed to the risk of traffic accidents by crossing the pedestrian crossing diagonally across the stop line in the pedestrian crossing.

Japanese Patent Application Laid-Open No. 10-2010-0110144 (Oct. 12, 2010)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a laser screen which is laterally extended in an installation place and which outputs a guide image to be guided on a side surface of a laser screen formed thereon as a hologram image Thereby providing a video providing system using a hologram capable of easily changing the contents of the guide, greatly increasing the visibility, and drastically reducing installation, manufacturing, and maintenance costs.

According to an aspect of the present invention, there is provided an image providing system for providing a three-dimensional guide image using a hologram, the image providing system comprising: a light source for emitting a laser toward an opposite side portion, A screen generating unit 110 for forming a laser screen 111 of the LCD device; A plurality of laser screens 111 are arranged at predetermined intervals along a longitudinal direction of the laser screen 111 and output a hologram image toward a side surface of the laser screen 111 to display a stereoscopic image 121, ); And a control unit (130) for driving and controlling the screen generating unit (110) and the hologram output unit (120) so that a guide image (121) having a guidance content designated according to setting items is displayed .

According to another aspect of the present invention, the screen generating unit 110 includes a laser screen 111 (see FIG. 1) that is disposed in a standing position on a side of a roadway and radiates laser in a form crossing the roadway along a crosswalk, The hologram output unit 120 displays a driver warning image 121a including a lighting guide of the driver's signal lamp 10 by outputting a hologram image spaced apart from the side of the crosswalk, The controller 130 controls the screen generating unit 110 and the hologram output unit 120 so that the driver warning image 121a is displayed in synchronization with the timing of the red light of the driver signal lamp 10 being turned on, Is provided.

According to another aspect of the present invention, the screen generating unit 110 includes a laser emitting unit 112 disposed at one side of the roadway to emit a laser beam, And a laser light receiving unit 113 disposed on the other side of the laser light receiving unit 113 for receiving the diverging laser and outputting a sensing signal. And controls the driving of the laser emitting unit 112 to stop the laser divergence if no light is received by the light receiving unit 113.

According to another aspect of the present invention, the screen generating unit 110 includes two laser light sources 111, two light source output units 114 extending vertically to form two laser screens 111 across the roadway, The output unit 120 includes a driver 120 which is disposed in the longitudinal direction along which the laser screen 111 of the two laser screens 111 is formed and outputs the hologram image to display the driver warning image 121a on the driver's side Side hologram output unit 120a and the other laser screen 111 are formed, and outputs a hologram image to display a pedestrian guide image 121b including a walking guide or advertisement guide toward the pedestrian side And a pedestrian side hologram output unit 120b.

According to another aspect of the present invention, there is further provided a traffic light sensing unit 140 for photographing an image of a driver signal light 10 or a pedestrian signal light 20 to detect a lighting state of a traffic light, , The driver warning image 121a is displayed when the driver's signal lamp 10 is lit in red or the pedestrian signal lamp 20 is illuminated green according to the detection signal of the signal lamp sensing unit 140, And controls driving of the screen generating unit 110 and the hologram output unit 120 so that the driver warning image 121a is not displayed.

As described above, according to the present invention,

First, a screen generating section 110 arranged upright on a side of an installation place such as a crosswalk, a sidewalk, a building or the like outputs a laser to form a laterally extended laser screen 111, It is possible to easily change the contents of the guide when compared with conventional guide and advertising means such as a banner, a large advertisement display board and a signboard by outputting a three-dimensional hologram image on the surface, thereby greatly increasing the visibility and dramatically increasing the installation, .

Second, the screen generating unit 110 forms a laser screen 111 which is disposed upright on the edge of the roadway and which is opposite to the running direction of the vehicle while radiating laser beams across the roadway along the crosswalk, The unit 120 may be spaced apart from the side of the crosswalk to output a hologram image to display a driver warning image 121a including a lighting guide of the driver's signal lamp 10, It is possible to quickly grasp whether the driver signal lamp 10 is turned on in red or not and whether the pedestrian is passing or not.

Third, when the laser output from the screen generating unit 110 is scanned by the pedestrian, the laser emitting unit 112 automatically stops the laser divergence driving by the laser emitting unit 112, so that the laser is scanned on the pedestrian's eye, It can prevent accidents.

In addition, an infrared ray detection unit 150 for detecting the approach of a pedestrian by irradiating infrared rays in parallel with the laser screen 111 formed at a position close to the screen generating unit 110 is disposed, and the emitted laser is blocked by a pedestrian Since the pedestrian approaching the laser screen 111 is detected before the laser divergence is automatically stopped and the laser divergence can be stopped in advance, the safety accident can be prevented in a double manner.

Fourth, the screen generating unit 110 forms two laser screens 111 that cross the roadway, and the hologram output unit 120 includes two light source output units 114, A driver's side hologram output unit 120a which is disposed apart from the laser screen 111 in the longitudinal direction in which the laser screen 111 is formed and outputs the hologram image to display the driver warning image 121a on the driver's side, A pedestrian side hologram output unit 120b for displaying a pedestrian guiding image 121b which is disposed apart from the other laser screen 111 in the longitudinal direction and outputs a hologram image to the pedestrian side and includes walking guidance or advertisement guidance, So that it is possible to simultaneously provide guidance contents such as warning and advertisement to be exposed to the driver and the pedestrian.

Fifth, when the driver signal lamp 10 is lit in red or the pedestrian signal lamp 20 is illuminated in green through the detection signal of the signal lamp detecting unit 140 which detects the lighting state of the driver signal lamp 10 or the pedestrian signal lamp 20, The driver warning image 121a is automatically displayed and when the lighting state is changed, the screen generator 110 and the hologram output unit 120 are driven and controlled so that the driver warning image 121a is not displayed, It is possible to implement the same effect of independently providing the guidance image 121 without signal connection with the control system 10.

1 is a perspective view illustrating a configuration of an image providing system using a hologram according to a preferred embodiment of the present invention.
2 is a block diagram illustrating a functional configuration of an image providing system according to a preferred embodiment of the present invention.
3 is a side view showing a configuration and operation principle of a screen generating unit according to a preferred embodiment of the present invention,
4 is a side view illustrating an operation principle of an image providing system according to a preferred embodiment of the present invention,
FIG. 5 is a schematic view illustrating an operation principle of outputting a hologram image using a hologram output unit according to a preferred embodiment of the present invention;
6 is a plan view showing a configuration for displaying a guide image in both directions according to a preferred embodiment of the present invention,
7 is a perspective view showing a configuration in which an image providing system using a hologram according to a preferred embodiment of the present invention is installed on a crosswalk;
FIG. 8 is a schematic view illustrating a configuration for detecting a pedestrian approaching a laser screen by an infrared ray sensing unit according to a preferred embodiment of the present invention;
FIG. 9 is a perspective view showing a configuration in which an image providing system using a hologram according to a preferred embodiment of the present invention is installed on a sidewalk;
10 is a perspective view showing a configuration in which an image providing system according to a preferred embodiment of the present invention is installed in an electric signboard (signboard) area of a building.

The objects, features and advantages of the present invention will become more apparent from the following detailed description. Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

The image providing system using the hologram according to the preferred embodiment of the present invention includes a laser screen 111 extending laterally from an installation site and a guiding image 121 to be guided on the side surface of the laser screen 111 By outputting the three-dimensional hologram image as a hologram image, it is possible to easily change the contents of the guide, significantly increase the visibility, and drastically reduce the installation, manufacturing cost, and maintenance cost. As shown in FIGS. 1 and 2 A screen generating unit 110, a hologram output unit 120, and a controller 130.

The screen generating unit 110 is a means for forming a virtual screen so that the hologram image output from the hologram output unit 120 can be displayed in the air. The screen generating unit 110 may include a side surface of an installation site such as a crosswalk, And a laser screen 111 having a predetermined height extending sideways is formed while emitting a laser toward the opposite side edge portions.

3, the screen generating unit 110 includes a laser emitting unit 112 that is disposed upright on one side of the installation site and emits a laser beam laterally, and a laser emitting unit 112 that faces the laser emitting unit 112 And a laser light receiving unit 113 for outputting a detection signal which is arranged in the other side portion of the place in the upright position and which emits a laser beam.

Here, the laser emitting unit 112 may include a light source having three hues such as RGB, and may simultaneously output a white laser beam while being output. A diffusing lens 115 is disposed at an output end of the laser beam to condense the output laser beam to increase the reach distance and diffuse the laser beam output from the light source to output the laser beam in a wide range, The expression area can be increased.

The laser light receiving unit 113 is disposed at a position where the laser light output from the laser light emitting unit 112 is incident to cover the incidence of the laser light into an unintended place, Can be detected.

The hologram output unit 120 is a means for displaying the stereoscopic image 121 to be guided on the formed laser screen 111. The hologram output unit 120 includes a plurality of laser screens 111, And outputs a hologram image toward the side surface of the laser screen 111 to display the three-dimensional guide image 121.

Here, as shown in FIG. 5, the hologram output unit 120 generates a reference beam by irradiating the hologram film with the laser beam output from the light source, and reflects the reference beam to the laser screen 111 side through a reflector, The guide image 121 to be displayed can be expressed in three dimensions.

The controller 130 is a microcontroller for driving and controlling the screen generator 110 and the hologram output unit 120 so that the guidance image 121 having the guidance contents designated according to the setting items set through the operation unit 152 is displayed And controls the screen generating unit 110 and the hologram output unit 120 to be driven.

The control unit 130 is provided with a memory 131 for storing image data for a hologram image to be displayed and driving program data for controlling the screen generating unit 110 and the hologram output unit 120 according to setting items The hologram output unit 120 reads image data for displaying the guide image 121 set in accordance with a control signal of the controller 130 from the memory 131 and outputs the image data in the form of a hologram image on the laser screen 111 .

According to the above-described configuration and function of the image providing system according to the preferred embodiment of the present invention, the screen generating unit 110 arranged upright on the edge of the installation place of the crosswalk, A laser screen 111 extending in the lateral direction is formed and a three-dimensional hologram image is output on the side surface of the laser screen 111. In comparison with conventional guide and advertising means such as a banner, The contents can be easily changed, the visibility can be greatly increased, and installation, manufacturing, and maintenance costs can be drastically reduced.

6 (a), the screen generating unit 110 is provided with two light source output units 114 extending vertically to form two laser screens 111, and the hologram output Part 120 is disposed on the other side of the two laser screens 111 so as to be spaced apart from each other and outputs guiding images 121 of different guiding contents to the side surfaces of the opposing laser screen 111, The guidance image 121 can be provided.

6B, the screen generating unit 110 is provided with one light source output unit 114, and the laser screen 111 is divided into a plurality of areas A and B, Each of the areas A and B may be provided with hologram output units 120 at different lateral positions to provide guidance images 121 of different guidance contents to both sides.

On the other hand, FIG. 7 discloses a configuration in which an image providing system according to a preferred embodiment of the present invention is installed on a crosswalk.

More specifically, the screen generating unit 110 is disposed upright on the edge of the roadway and forms a laser screen 111 which is opposite to the running direction of the vehicle while emitting a laser in a form crossing the roadway along the crosswalk , The hologram output unit 120 is spaced apart from the side of the crosswalk, outputs a hologram image, and displays a driver warning image 121a including a lighting guide of the driver's signal light 10.

The control unit 130 drives and controls the screen generating unit 110 and the hologram output unit 120 so that the driver warning image 121a is displayed in synchronization with the timing of turning on the red light of the driver signal lamp 10 .

Thus, the driver warning image 121a including the lighting guidance of the driver's signal lamp 10 can be displayed. Therefore, whether or not the driver's signal lamp 10 is illuminated in red and whether or not the pedestrian is passing can be displayed in proximity to the crosswalk You can quickly understand the situation.

In addition, the laser emitting unit 112 of the screen generating unit 110 is disposed on one side of the roadway to emit a laser beam, and the laser receiving unit 113 is disposed on the other side of the roadway opposite to the laser emitting unit 112 Receives a divergent laser beam, and outputs a detection signal.

The control unit 130 preferably controls the laser emitting unit 112 to stop driving the laser emitting unit 112 when the laser beam emitted from the laser receiving unit 113 is not received by the laser receiving unit 113 Do.

In this way, when the laser output from the screen generating unit 110 is scanned by the pedestrian, the laser emitting unit 112 automatically stops the laser divergence driving by detecting the laser, so that the laser is scanned on the eyes of the pedestrian, Safety accidents can be prevented.

As shown in FIG. 8, an infrared ray sensing unit 150 is disposed at a position close to the screen generating unit 110 to detect the approach of a pedestrian by irradiating the infrared ray in parallel with the laser screen 111, Since the divergent laser is blocked by the pedestrian and the pedestrian approaching the laser screen 111 is detected before the laser divergence is automatically stopped, the laser divergence can be stopped in advance, so that the safety accident can be prevented in advance.

6 and 7, the screen generating unit 110 includes two laser source output units 114 extending vertically to form two laser screens 111 across the roadway.

The hologram output unit 120 is spaced apart along the longitudinal direction of the laser screen 111 of one of the two laser screens 111 and outputs the hologram image to display the driver warning image 121a on the driver's side And a pedestrian guide image 121b which is disposed apart from the driver's side hologram output unit 120a and which is arranged along the longitudinal direction in which the other laser screen 111 is formed and outputs a hologram image, And a pedestrian side hologram output unit 120b that displays a warning message such as a warning and an advertisement to be exposed to the driver and the pedestrian.

Meanwhile, the image providing system according to the preferred embodiment of the present invention may further include a signal light sensing unit 140 that senses the lighting state of a traffic light by photographing an image of the driver signal light 10 or the pedestrian signal light 20 have.

If the driver signal lamp 10 is lit in red or the pedestrian signal lamp 20 is illuminated in green according to the detection signal of the signal lamp sensing unit 140, the controller 130 displays the driver warning image 121a And may control driving of the screen generating unit 110 and the hologram output unit 120 so that the driver warning image 121a is not displayed when the lighting state is changed.

Therefore, in order to control the controller 130 to display the driver warning image 121a on the laser screen 111 in synchronization with the driver signal lamp 10 or the pedestrian signal lamp 20, the driver signal lamp 10 and the pedestrian signal lamp 20 The control signal for the signal change must be received from the signal lamp control system 10 which drives and controls the signal lamp.

Accordingly, in the image providing system according to the preferred embodiment of the present invention, the guidance image 121 can be independently displayed without inputting a control signal from the conventional signal lamp control system 10. [

To this end, the image providing system according to the preferred embodiment of the present invention further includes a traffic light sensing unit 140 for sensing the lighting state of a traffic light by photographing an image of the driver signal light 10 or the pedestrian signal light 20 .

If the driver signal lamp 10 is lit in red or the pedestrian signal lamp 20 is illuminated in green according to the detection signal of the signal lamp sensing unit 140, the controller 130 displays the driver warning image 121a And controls the screen generating unit 110 and the hologram output unit 120 so that the driver warning image 121a is not displayed when the lighting state is changed.

The traffic light sensing unit 140 may be a light sensor disposed at a front position of the driver signal lamp 10 or the pedestrian signal lamp 20 to detect a change in light quantity according to the lighting change, And a camera and an image analyzing means for detecting an illumination change by performing an image analysis of the image.

The driver signal lamp 10 is lit in red or the pedestrian signal lamp 20 is illuminated green through the detection signal of the signal lamp detector 140 for detecting the lighting state of the driver signal lamp 10 or the pedestrian signal lamp 20, The driver warning image 121a is automatically displayed and when the lighting state is changed, the screen generator 110 and the hologram output unit 120 are driven and controlled so that the driver warning image 121a is not displayed, It is possible to implement the same effect of independently providing the guidance image 121 without signal connection with the control system 10.

7, the image providing system according to the preferred embodiment of the present invention may be installed on a pedestrian crossing to provide a driver warning image 121a and a pedestrian guidance image 121b to a driver and a pedestrian As shown in FIG. 9, the guidance image 121 may be provided on the vehicle so as to output a guide image 121 containing various advertisement contents to the pedestrian.

In addition, as shown in FIG. 10, a guide image 121 may be provided in an installation place where an existing large advertising signboard or signboard is installed on a building, and includes signboard contents such as advertisement contents and company name.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be clear to those who have knowledge.

110 ... screen generating unit 111 ... laser screen
112 ... laser emitting portion 113 ... laser receiving portion
120 ... hologram output section 121 ... guidance image
140 ... signal light detection unit

Claims (4)

1. An image providing system for providing a three-dimensional guide image using a hologram,
A screen generating unit 110 disposed on one side of the installation site and forming a laser screen 111 having a predetermined height extending sideways while emitting a laser toward the opposite side of the opposite side;
A plurality of laser screens 111 are arranged at predetermined intervals along a longitudinal direction of the laser screen 111 and output a hologram image toward a side surface of the laser screen 111 to display a stereoscopic image 121, ); And
And a control unit (130) for driving and controlling the screen generating unit (110) and the hologram output unit (120) so that a guide image (121) having a guidance content designated according to the setting items is displayed.
The method according to claim 1,
The screen generating unit 110 forms a laser screen 111 that is disposed upright on the edge of the roadway and which is opposite to the running direction of the vehicle while emitting a laser in a form crossing the roadway along the crosswalk,
The hologram output unit 120 displays a driver warning image 121a including a lighting guide of the driver's signal lamp 10 by outputting a hologram image spaced apart from the side of the crosswalk,
The controller 130 controls the screen generating unit 110 and the hologram output unit 120 so that the driver warning image 121a is displayed in synchronization with the timing of the red light of the driver signal lamp 10 being turned on, And the image processing apparatus.
3. The method of claim 2,
The screen generating unit 110 includes a laser emitting unit 112 disposed at one side of the roadway to emit a laser beam and a laser emitting unit 112 disposed at the other side of the roadway facing the laser emitting unit 112, And a laser light receiving unit 113 for receiving the laser and outputting a detection signal,
The control unit 130 controls the laser emitting unit 112 to stop driving the laser emitting unit 112 if the laser beam emitted from the laser receiving unit 113 is not received by the laser receiving unit 113 .
The method according to claim 2 or 3,
The screen generating unit 110 includes two laser light output units 114 extending vertically to form two laser screens 111 across the roadway,
The hologram output unit 120 includes:
A driver's side hologram output unit 120a which is disposed apart from the laser screen 111 of one of the two laser screens 111 and outputs a hologram image and displays the driver warning image 121a on the driver side, And a pedestrian's side hologram output unit (121b) which is disposed apart from the other laser screen (111) in the longitudinal direction and outputs a hologram image to display a pedestrian guide image (121b) 120b). ≪ / RTI >
KR1020150144385A 2015-10-15 2015-10-15 Guide image providing system using hologram KR20170044561A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110288845A (en) * 2019-07-29 2019-09-27 大连科技学院 A kind of packaged type light wall signal lamp device
KR20190121660A (en) 2018-04-18 2019-10-28 정상휘 Signboard advertising system and method using hologram
KR20200008292A (en) 2018-07-16 2020-01-28 이종연 Canopy devices installed at crosswalk
KR20200083430A (en) 2020-07-01 2020-07-08 이종연 Canopy devices installed at crosswalk

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190121660A (en) 2018-04-18 2019-10-28 정상휘 Signboard advertising system and method using hologram
KR20200008292A (en) 2018-07-16 2020-01-28 이종연 Canopy devices installed at crosswalk
CN110288845A (en) * 2019-07-29 2019-09-27 大连科技学院 A kind of packaged type light wall signal lamp device
KR20200083430A (en) 2020-07-01 2020-07-08 이종연 Canopy devices installed at crosswalk

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