Road surface projector

Abstract

To provide a road surface projector that makes it possible to easily determine whether pedestrians can cross a pedestrian crossing by providing a projection display for pedestrians on the road surface of the pedestrian crossing in response to the lighting or flashing of a traffic light.SOLUTION: A road surface projector includes a signal detection unit 10 that detects the operating behavior of a pedestrian signal 2, a projection unit 20 that performs projection display on a road surface 3, and a control unit 30. The control unit 30 performs a route projection process that projects a route design display D, which is an array of a plurality of graphic elements E indicating a direction of travel at the time of crossing in the direction of travel, onto the road surface 3 when a green light or a blinking light is detected, and a design shortening process that shortens the length of the route design display D in response to a decrease in the remaining time of a lit or blinking green signal, as determined based on the operating behavior of the pedestrian signal 2.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a road surface projection device that performs projection display for pedestrians on the road surface of a crosswalk.

Background Art

[0002] Conventionally, for example, a display control system for a traffic signal described in Patent Document 1 is known. Patent Document 1 discloses a pedestrian signal with a remaining time display device that serves as an auxiliary light for notifying the remaining time until the signal changes (see, for example, FIG. 1 of Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above - mentioned conventional display control system for traffic signals, when a pedestrian crossing the road notices the blinking of the signal, there is a problem that it is difficult to determine whether to increase the walking speed to cross or to give up crossing and turn back.

[0005] Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a road surface projection device that can easily determine whether a pedestrian can cross a crosswalk by performing projection display for pedestrians on the road surface of the crosswalk according to the lighting and blinking of the traffic signal.

Means for Solving the Problems

[0006] The present invention relates to a road surface projection device 1 provided with a pedestrian traffic signal 2 as a projection target, including a signal detection unit 10 for detecting the operation behavior of the pedestrian traffic signal 2, a projection unit 20 for performing a desired projection display on a road surface 3 on which the crosswalk is drawn, and a control unit 30. The control unit 30, when the signal detection unit 10 detects a lit or flashing state of a green signal, performs a path projection process S5, S8 in which a path design display D representing a crossing path on the crosswalk and graphic elements E (E1, E2) indicating the traveling direction at the time of crossing are projected on the road surface by the projection unit 20 along the traveling direction, and a design shortening process S6, S9 for shortening the length of the path design display D in the direction along the crossing path in response to a decrease in the remaining time of the lit or flashing state of the green signal determined based on the operation behavior detected by the signal detection unit 10.

Effect of the Invention

[0007] According to the present invention, by projecting and displaying on the road surface where pedestrians cross a design that visually and clearly shows the remaining time during which the green signal of the traffic signal remains lit or flashing, it is possible to easily determine whether pedestrians can cross the crosswalk.

Brief Description of the Drawings

[0008]

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Mode for Carrying Out the Invention

[0009] (First Embodiment of the Present Invention) The road surface projection device according to this embodiment will be described with reference to FIGS. 1 to 6. The road surface projection device according to this embodiment uses the road surface of a crosswalk where a pedestrian signal is installed as a projection target, and changes the display mode that is projected and displayed over time according to the lighting or flashing of the pedestrian signal.

[0010] FIG. 1 is a block diagram showing the configuration of the road surface projection device according to this embodiment. The road surface projection device 1 includes a signal detection unit 10 that detects the operation behavior such as the color of the lighting / flashing of the pedestrian signal 2 and the lighting / flashing time, a projection unit 20 that performs a desired projection display on the road surface 3 on which the crosswalk pattern is drawn, and a control unit 30 that controls the projection display performed by the projection unit 20 based at least on the detection signal from the signal detection unit 10.

[0011] The signal detection unit 10 is an image sensor such as a camera, for example, and passes the signal imaging information 11 obtained by imaging the pedestrian traffic signal 2 to be detected to the control unit 30. The control unit 30 performs image analysis on the signal imaging information 11 acquired from the signal detection unit 10 to determine whether the pedestrian traffic signal 2 is in a lit state or a blinking state, determine the color (red or blue) of the lighting / blinking, calculate the duration of the lighting / blinking (the duration of the state after the lighting / blinking or the color change), etc., and determines the operation behavior. Then, it generates design information corresponding to the determined operation behavior and passes a control signal for projecting and displaying the design information to the projection unit 20. The projection unit 20 is a projector having a function of changing, for example, the direction of the optical axis of the irradiated light and the focal length, and performs projection display on the road surface 3 of the crosswalk according to the control signal acquired from the control unit 30.

[0012] Note that the signal detection unit 10 may use an image sensor such as a camera as described above, or may be capable of directly receiving a signal regarding the state of the pedestrian traffic signal 2 from the pedestrian traffic signal 2.

[0013] FIG. 2 is a functional block diagram showing the configuration of the control unit 30 in the road surface projection device 1 according to the present embodiment. The control unit 30 includes an operation behavior analysis unit 31 that analyzes the signal imaging information 11 imaged by the signal detection unit 10 to determine the operation behavior of the pedestrian traffic signal 2, and a display mode specifying unit 32 that specifies the display mode of the path design to be projected and displayed on the road surface 3 of the crosswalk based on the design information registered in advance in the design information storage unit 34 according to the determined operation behavior of the pedestrian traffic signal 2, and a projection processing unit 33 that outputs control information 12 for controlling the projection unit 20 to project and display the path design on the road surface 3 of the crosswalk in the specified display mode.

[0014] The motion behavior analysis unit 31 analyzes the signal imaging information 11 by image analysis to determine the motion behavior of whether the color of the pedestrian signal 2 is red (no crossing allowed) or blue (crossing allowed). Further, it determines the motion behavior of whether it is in the red lit state, the blue lit state, or the blue blinking state. Additionally, it calculates the elapsed time and remaining time since the state transition to each of the red lit state, blue lit state, or blue blinking state. Note that the elapsed time and remaining time in each state may be calculated by the time measurement unit (not shown) measuring the actual elapsed time since the state transition through image analysis of the signal imaging information 11, or when the duration of each state is registered in advance as signal setting information (not shown), it may be calculated based on that information.

[0015] The display mode specifying unit 32 extracts and specifies the display mode of the projection display corresponding to the motion behavior of the pedestrian signal 2 from the design information registered in the design information storage unit 34. In the design information storage unit 34, design information corresponding to the motion behavior of the pedestrian signal 2 is registered and stored in advance. For example, when the pedestrian signal 2 is in the blue or red lit state, or the blue blinking state, the design projected on the road surface 3, the color at that time, the display mode (steady display, blinking display), etc. are stored. The display mode specifying unit 32 extracts the design that matches the motion behavior of the pedestrian signal 2 determined by the motion behavior analysis unit 31 and specifies the display mode set for that motion behavior.

[0016] The projection processing unit 33 generates a control signal for controlling the projection unit 20 to perform projection display on the road surface 3 in the display mode of the design information specified by the display mode specifying unit 32, and sends it to the projection unit 20 as control information 12. Also, the projection processing unit 33 generates a control signal for controlling the projection unit 20 so that the length in the direction along the crossing path of the path design display D changes to be shorter according to the elapsed time since the state transition of the pedestrian signal 2, and transmits it to the projection unit 20 as control information 12. Then, the projection unit 20 that receives the control information 12 performs projection display on the road surface 3 of the crosswalk in the display mode specified by the display mode specifying unit 32 according to the control signal included in the control information 12.

[0017] Here, a specific example will be given and described for the display mode projected onto the road surface 3 of the crosswalk. FIG. 3 is a diagram showing an example of the display mode projected and displayed by the projection unit 20 in the road surface projection device 1 according to the present embodiment. FIG. 4 is a diagram showing an example of the display mode when the design changes according to the passage of time in the projection display of FIG. 3. FIG. 5 is a diagram showing an example of the display mode when a part of the graphic elements E of the route design display D is projected and displayed in a different color in the projection display of FIG. 4. In FIGS. 3 to 5, the display content projected onto the road surface 3 of the crosswalk is, for example, a route design display D representing a crossing route on the crosswalk, in which a plurality of graphic elements E indicating the traveling direction at the time of crossing are arranged along the traveling direction.

[0018] In the example shown in FIG. 3, a plurality of first graphic elements E1 representing the traveling direction from the near side (one side) to the far side (the other side) are projected and displayed in the area on the left side of the crosswalk (the left side as seen from the pedestrian crossing). A plurality of second graphic elements E2 representing the traveling direction from the far side (the other side) to the near side (one side) are projected and displayed in the area on the right side of the crosswalk (the right side as seen from the pedestrian crossing).

[0019] In the example shown in FIG. 4, as the remaining time during which the pedestrian signal 2 maintains the blue lit state or the blue blinking state decreases, the length of the route design display D along the crossing route becomes shorter. At this time, in particular, while fixing the position of the design end D1 on the end side of the crossing of the route design display D, the design start D2 on the start side of the crossing of the route design display D is moved (or gradually erased) toward the design end D1 side, so that the length of the route design display D changes and is projected and displayed. Finally, when the blue blinking state ends and transitions to the red lit state, the projection display of the route design display D ends at the same time.

[0020] In the example shown in FIG. 5, in the route design display D shown in FIG. 4, only the graphic element E of the design start D2 on the start side of the crossing is projected and displayed in a color different from the other graphic elements E (for example, when the other graphic elements E are projected and displayed on the road surface 3 in green or blue, it is a warm color (a warm color such as orange, excluding red)). In FIG. 5, the warm color is shown in white.

[0021] In this way, appropriate information for pedestrians on the crosswalk is projected and displayed on the road surface 3 of the crosswalk according to the operation behavior of the pedestrian signal 2.

[0022] Note that the display modes and display contents of the projection display shown in FIGS. 3 to 5 are merely examples and are not limited thereto. For example, in the projection display of FIGS. 3 to 5, the projection display of the route design display D may be started at the timing when the pedestrian signal 2 switches from the red light on to the blue light on, and may be controlled so that the projection display of the route design display D disappears when the blinking of the blue light ends. Also, at this time, the route design display D may be constantly displayed when the blue light is on, and may be blinked when the blue light is blinking.

[0023] Furthermore, the projection display of the route design display D may be started at the timing when the pedestrian signal 2 switches from the blue light on to the blue light blinking, and may be controlled so that the projection display of the route design display D is turned off when the blinking of the blue light ends.

[0024] Furthermore, in FIG. 3, a plurality of first graphic elements E1 representing the traveling direction from the near side (one side) to the far side (the other side) are projected and displayed on the left side of the crosswalk, and a plurality of second graphic elements E2 representing the traveling direction from the far side (the other side) to the near side (one side) are projected and displayed on the right side of the crosswalk. However, the projection display positions of the first graphic elements E1 and the second graphic elements E2 may be reversed left and right, or a plurality of second graphic elements E2 representing the traveling direction from the central position of the crosswalk to the near side and a plurality of first graphic elements E1 representing the traveling direction from the central position of the crosswalk to the far side may be projected and displayed, or only one of them may be projected and displayed. In particular, it is desirable that the display mode of the projection display can be arbitrarily changed according to the time zone, the detection state of pedestrians described in the second embodiment, and the like.

[0025] Furthermore, in FIGS. 4 and 5, while maintaining the position of the design end D1 fixed, an example is shown in which the display mode is changed by moving the design start end D2 toward the design end D1. However, the change in the path design display D is not limited to this, and any change that shortens the length of the path design display D (the length along the traveling direction of the pedestrian) in response to the decrease in the remaining time of the lit or blinking state of the blue signal may be used. For example, the path design display D may be shortened by moving the design end D1 toward the design start end D2 while moving the design start end D2 toward the design end D1, or the path design display D may be shortened as a whole by shortening the width in the traveling direction of each graphic element E while maintaining the interval between the graphic elements E when the graphic elements E are arranged in parallel.

[0026] Furthermore, in FIG. 5, the color of the graphic element E of the design start end D2 is described as a warm color, but any color different from the other graphic elements E may be used.

[0027] Furthermore, in FIGS. 4 and 5, when the blue signal is lit, the path design display D may be projected and displayed on the road surface 3 in green or blue, and when the blue signal is blinking, all the graphic elements E of the path design display D (in the case of FIG. 4) or the graphic elements E of the design start end D2 (in the case of FIG. 5) may be changed to a warm color and projected and displayed.

[0028] Next, the operation of the road surface projection device 1 will be described. FIG. 6 is a flowchart showing the operation of the road surface projection device 1 according to the present embodiment. In FIG. 6, the signal detection unit 10 images the pedestrian signal 2 (S1). The operation behavior analysis unit 31 of the control unit 30 performs processes such as image analysis on the signal imaging information 11 imaged by the signal detection unit 10 to analyze the operation behavior of the pedestrian signal 2 (S2). When the signal detection unit 10 directly receives information regarding the state from the pedestrian signal 2, the operation behavior based on the signal is analyzed.

[0029] The display mode specifying unit 32 and the projection processing unit 33 of the control unit 30 determine the result of the analyzed motion behavior (S3). When the motion behavior of the pedestrian traffic signal 2 is a red light on, the process ends without performing anything in particular. When the motion behavior of the pedestrian traffic signal 2 is a blue light on or a blue flashing, the display mode specifying unit 32 extracts and specifies the display mode of the design information to be displayed corresponding to the motion behavior of the pedestrian traffic signal 2 from the design information pre-registered in the design information storage unit 34 (S4). The projection processing unit 33 controls the projection unit 20 to project and display the path design display D on the road surface 3 of the crosswalk in the display mode specified in S4 (S5) (path projection process). Then, the projection processing unit 33 controls the projection unit 20 to project and display the length of the path design display D along the cross path in the direction of the cross path projected and displayed by the projection unit 20 to be shortened in accordance with the decrease in the remaining time of the green signal on state or flashing state (S6) (design shortening process), and ends the process.

[0030] Note that in the above flowchart, as described above, when a blue light on is detected, the display mode specifying unit 32 may specify the color of the path design display D as green or blue, and when a blue flashing is detected, the display mode specifying unit 32 may specify the whole or only a part of the front side of the path design display D as a warm color.

[0031] As described above, in the road surface projection device 1 according to the present embodiment, there are provided a signal detection unit 10 that detects the operation behavior of the pedestrian traffic signal 2, a projection unit 20 that performs a desired projection display on the road surface 3 on which the crosswalk is drawn, and a control unit 30. When the signal detection unit 10 detects that the green signal is in the lit state or the flashing state, the control unit 30 causes the projection unit 20 to project onto the road surface 3 a path design display D that represents a crossing path on the crosswalk and in which a plurality of first and second graphic elements E1 and E2 indicating the traveling direction at the time of crossing are arranged along the traveling direction (path projection process S5). Based on the operation behavior detected by the signal detection unit 10, the control unit 30 executes a design shortening process S4 of shortening the length of the path design display D in the direction along the crossing path in response to the decrease in the remaining time of the lit state or the flashing state of the green signal. By visually and clearly representing the remaining time during which the green signal remains lit or flashing, it is possible to easily and intuitively determine whether a pedestrian can cross the crosswalk, and appropriately determine whether to cross straight ahead or turn back.

[0032] Also, in the design shortening process S4, the control unit 30 moves the design start end D2 on the start side of the crossing of the path design display D toward the end side of the crossing over time while maintaining the design end D1 on the end side of the crossing of the path design display D, thereby shortening the length of the path design display D in the direction along the crossing path. Thus, the speed at which the path design display D gradually shortens can visually and clearly indicate to the pedestrian the required speed to cross the crosswalk. Specifically, it can be determined that it is impossible to cross within the time unless at least the pedestrian's foot catches on the design start end D2.

[0033] Furthermore, since the path design display D includes a first graphic element E1 that represents the traveling direction from one side to the other side in the crossing path and a second graphic element E2 that represents the traveling direction from the other side to one side in the crossing path, it is possible to reliably notify the time during which the green signal remains lit or flashing and the required speed to cross the crosswalk to pedestrians crossing in either direction.

[0034] Furthermore, in order to project and display the graphic element E of the design start end D2 on the start side of the path design display D that moves to the end side over time in a color different from the other graphic elements E, it is possible to intuitively and clearly inform the pedestrian of the necessary speed to cross within the remaining time of the blue light on or blue flashing.

[0035] Furthermore, in the case of the lit state of the blue signal, the path design display D is projected and displayed in green or blue, and in the case of the flashing state of the blue signal, at least a part of the path design display D is projected and displayed in a warm color, so that it is possible to surely inform the pedestrian that the remaining time for crossing has become short.

[0036] (Second Embodiment of the Present Invention) The road surface projection device according to the present embodiment will be described with reference to FIGS. 7 to 11. The road surface projection device according to the present embodiment detects the crossing state or crossing preparation state (a state of standing in front of the crosswalk and waiting for the pedestrian signal 2 to turn blue) of a pedestrian walking on the crosswalk, and performs projection display on the road surface 3 according to the crossing state or crossing preparation state. In addition, in the present embodiment, the description overlapping with the first embodiment is omitted.

[0037] FIG. 7 is a block diagram showing the configuration of the road surface projection device 1 according to the present embodiment, and FIG. 8 is a functional block diagram showing the configuration of the control unit 30 in the road surface projection device 1 according to the present embodiment. 7 and 8, the difference from the configurations of FIGS. 1 and 2 in the first embodiment is that the road surface projection device 1 includes a pedestrian detection unit 40 that detects a pedestrian walking on the crosswalk, and the display mode specifying unit 32 and the projection processing unit 33 of the control unit 30 acquire the detection information of the pedestrian from the pedestrian detection unit 40, and project and display the path design display D on the road surface 3 in a display mode corresponding to the detected crossing state or crossing preparation state of the pedestrian.

[0038] The pedestrian detection unit 40 is, for example, an image sensor such as a camera or an infrared sensor, and passes pedestrian imaging information 13 obtained by imaging a pedestrian walking on the crosswalk (including during preparation before walking) to the display mode specifying unit 32 and the projection processing unit 33 of the control unit 30. When the pedestrian detection unit 40 detects a pedestrian walking on the crosswalk, the display mode specifying unit 32 and the projection processing unit 33 execute projection display on the road surface 3, and when no pedestrian is detected, they do not execute projection display on the road surface 3. That is, since it is useless to perform projection display directed at a pedestrian when there is no pedestrian, unnecessary projection display can be avoided. Further, when a pedestrian is detected and projection display is performed, in addition to the display mode described in the first embodiment, it is possible to perform more diverse projection display based on the pedestrian imaging information 13.

[0039] Here, specific examples will be given and described regarding the display mode on the road surface 3 of the crosswalk based on the crossing state or crossing preparation state of the pedestrian. FIG. 9 is a diagram showing an example of projection display in a common display mode for pedestrians when a pedestrian is detected in the road surface projection device 1 according to the present embodiment, FIG. 10 is a diagram showing an example of projection display in different display modes for each pedestrian when a pedestrian is detected in the road surface projection device 1 according to the present embodiment, and FIG. 11 is a diagram showing an example of projection display in a display mode corresponding to the walking speed of the pedestrian detected in the road surface projection device 1 according to the present embodiment.

[0040] In the examples shown in FIGS. 9 and 10, for each pedestrian detected by the pedestrian detection unit 40, a route design display D is projected and displayed on the road surface 3 on the front side of the traveling direction of the pedestrian. At this time, in the case of FIG. 9, a common route design display D is projected and displayed for all pedestrians, and in the case of FIG. 10, route design displays D of different shapes are projected and displayed for each pedestrian. In FIGS. 9 and 10, as illustrated in FIG. 3 in the first embodiment, the length of the route design display D may be constant, or as illustrated in FIG. 4, the length of the route design display D may be changed to be shorter in accordance with the decrease in the remaining time of the blue lighting or blue blinking. Further, when the number of detected pedestrians exceeds the number of patterns of the route design display D prepared in advance, a partially common route design display D may be projected and displayed among the pedestrians.

[0041] In the example shown in FIG. 11, among the pedestrians detected by the pedestrian detection unit 40, one pedestrian with the maximum remaining distance until crossing the crosswalk is identified, and a route design display D is projected and displayed on the road surface 3 on the front side of the traveling direction of the identified pedestrian.

[0042] Here, one pedestrian with the maximum remaining distance until crossing is identified and the route design display D is projected and displayed. However, based on the walking speed and the remaining distance, one pedestrian estimated to be the last to cross may be identified and the route design display D may be projected and displayed, or all pedestrians estimated to have difficulty crossing before the end of the blue blinking may be identified and the route design display D may be projected and displayed. In this case, for pedestrians estimated to be able to cross before the end of the blue blinking by running etc. from the middle, the once-lit route design display D may be turned off.

[0043] Next, the operation of the road surface projection device 1 will be described. FIG. 12 is a flowchart showing the operation of the road surface projection device 1 according to the present embodiment. In FIG. 12, first, the pedestrian detection unit 40 images the peripheral area of the crosswalk (S1). The display mode specifying unit 32 and the projection processing unit 33 of the control unit 30 acquire the pedestrian imaging information 13 imaged in S1, and determine the presence or absence of pedestrians in the crossing state or the crossing preparation state (S2). If no pedestrians in the crossing state or the crossing preparation state are detected, the process ends as it is. If pedestrians in the crossing state or the crossing preparation state are detected, one or more pedestrians who are the targets for projecting and displaying the route design display D are specified (S3).

[0044] The processes from S4 to S7 are the same as the processes from S1 to S4 in FIG. 6 in the first embodiment. When the design information to be projected and displayed in S7 is specified, the projection processing unit 33 controls the projection unit 20 to project and display the route design display D specified in S7 on the road surface 3 on the front side in the traveling direction of the pedestrians specified in S3 (S8) (route projection process). Then, for each route design display D for each pedestrian that the projection unit 20 is projecting and displaying, the projection processing unit 33 controls the projection unit 20 to project and display the length in the direction along the crossing route shorter in accordance with the decrease in the remaining time of the lighting state or the blinking state of the blue signal (S9) (design shortening process), and ends the process.

[0045] As described above, in the road surface projection device according to the present embodiment, pedestrians in the crossing state or the crossing preparation state of the crosswalk are detected, and when the pedestrians are detected, projection display is performed on the road surface 3 of the crosswalk. Therefore, the projection display process is executed only when there are pedestrians who can confirm the projection display, and unnecessary projection display processes can be avoided when there are no pedestrians, and a state that can cause congestion due to unnecessary projection display can be avoided.

[0046] In addition, in order to project and display the route design display D on the road surface 3 on the front side in the traveling direction of the detected pedestrians, the route design display D can be surely projected and displayed in front of the eyes of the pedestrians crossing the crosswalk and can be visually recognized by the pedestrians.

[0047] Furthermore, based on the detection result of the pedestrian detection unit 40, the route design display D is projected and displayed on the road surface 3 on the front side of the traveling direction of one pedestrian with the maximum remaining distance until crossing the crosswalk is completed, so that the pedestrian with the highest necessity to determine whether they can cross can surely view the route design display D.

[0048] (Other Embodiments of the Present Invention) Hereinafter, a road surface projection device according to other embodiments will be described. In this embodiment, descriptions overlapping with the above embodiments are omitted.

[0049] In the road surface projection device 1 according to the first embodiment and the second embodiment, when the remaining time of the lighting state or blinking state of the blue signal becomes zero, that is, at the same time as the state transitions to red lighting, the length of the route design display D is also zero and the projection display is turned off. Therefore, when the red lighting is detected, no particular processing is performed. However, the projection unit 20 may be controlled so that even when the remaining time of the lighting state or blinking state of the blue signal becomes zero, some display (for example, the design end D1 of the route design display D, new design information indicating that the signal has turned red, etc.) remains in the route design display D. In this case, at the same time as the pedestrian signal 2 transitions to the red lighting state, the projected design may be projected and displayed in warm colors for a predetermined time (for example, about several seconds or the time until the vehicle signal turns blue), and then turned off.

[0050] Also, similar to the above case, when the red signal lighting state is detected and a pedestrian who has not finished crossing the crosswalk is detected, the route design display D projected and displayed (the projection display remains) on the road surface 3 on the front side of the traveling direction of the pedestrian may be projected and displayed in warm colors at the same time as the pedestrian signal 2 transitions to the red lighting state, and then turned off.

Explanation of Reference Numerals

[0051] D Route design display D1 Design end D2 Design start E Graphic Element E1 First Graphic Element E2 Second Graphic Element 1 Road Surface Projection Device 2 Pedestrian Signal 3 Road Surface 10 Signal Detection Unit 11 Signal Imaging Information 12 Control Information 13 Pedestrian Imaging Information 20 Projection Unit 30 Control Unit 31 Motion Behavior Analysis Unit 32 Display Mode Specifying Unit 33 Projection Processing Unit 40 Pedestrian Detection Unit

Claims

1. A road surface projection device provided with a crosswalk with a pedestrian signal as a projection target, a signal detection unit that detects the operation behavior of the pedestrian signal, a projection unit that performs a desired projection display on the road surface on which the crosswalk is drawn, a control unit, comprising: When the signal detection unit detects a lit or flashing state of a green signal, the control unit performs a path projection process of projecting, by the projection unit, on the road surface a path design display representing a crossing path on the crosswalk, with graphic elements indicating the traveling direction at the time of crossing along the traveling direction; a design shortening process of shortening the length of the path design display in the direction along the crossing path in accordance with a decrease in the remaining time of the lit or flashing state of the green signal, which is determined based on the operation behavior detected by the signal detection unit; A road surface projection device characterized by executing the above.

2. In the design shortening process, the control unit shortens the length of the path design display in the direction along the crossing path by moving the design start end on the start side of crossing of the path design display over time toward the end side of crossing while maintaining the design end on the end side of crossing of the path design display. The road surface projection device according to claim 1, characterized by the above.

3. The path design display includes a first graphic element representing the traveling direction from one side to the other side in the crossing path and a second graphic element representing the traveling direction from the other side to the one side in the crossing path. The road surface projection device according to claim 1, characterized by the above.

4. further includes a pedestrian detection unit that detects pedestrians in a crossing state or a pre-crossing state of the crosswalk, and the control unit executes the path projection process when the pedestrian detection unit detects the pedestrian. The road surface projection device according to claim 1, characterized by the above.

5. In the path projection process, the control unit projects, by the projection unit, the path design display on the road surface on the front side of the traveling direction of the pedestrian detected by the pedestrian detection unit. The road surface projection device according to claim 4, characterized by the above.

6. In the path projection process, the control unit projects, by the projection unit, the path design display on the road surface on the front side of the traveling direction of the one pedestrian with the maximum remaining distance until the end of crossing, based on the detection result of the pedestrian detection unit. The road surface projection device according to claim 5, characterized by the above.

7. In the design shortening process, the control unit causes the graphic element at the design start end on the start side of the path design display that is moved to the end side over time to be displayed by the projection unit in a color different from the other graphic elements. The road surface projection device according to claim 2, characterized in that.

8. The control unit when the lighting state of the blue signal is detected by the signal detection unit, causes the path design display to be projected onto the road surface in green or blue by the projection unit; when the blinking state of the blue signal is detected by the signal detection unit, causes at least a part of the path design display to be projected onto the road surface in a warm color by the projection unit. The road surface projection device according to claim 1, characterized in that.

Images