Intelligent road sign indication system based on route planning

Abstract

The present invention relates to the technical field of intelligent road signs, and in particular to an intelligent road sign indication system based on route planning, comprising: an intelligent road sign, including a direction sign, a display touch screen and an alarm light, for indicating the direction of travel to the user and displaying the route and images of markers, and indicating the direction of travel of an emergency shelter in an emergency; an interactive unit, for receiving a destination input by a user and marking the user at the same time, and determining whether the user on the route deviates from the route; a planning unit, for planning the route according to the destination; a cruise drone, for collecting road condition information, and performing occlusion detection and driving the intelligent road sign to travel to an unobstructed road sign point through the interactive unit. The present invention can quickly plan the optimal route by setting the above-mentioned device, and further improve the accuracy of the intelligent road sign while providing clear direction guidance.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent road signs, and in particular to an intelligent road sign indication system based on route planning. Background Art

[0002] Smart road signs are road sign poles or road sign devices that use sensors, communication technology, electronic display screens, microprocessors and other modern scientific and technological means to sense surrounding environmental information in real time, communicate interactively with other devices or systems, and dynamically display relevant traffic instructions or other practical information according to different situations. Unlike traditional road signs with fixed content, smart road signs can dynamically adjust the displayed content in real time according to actual conditions such as traffic flow, weather conditions, and road construction. For example, in traffic congested sections, the estimated time of passage can be displayed; in rainy and snowy weather, it can prompt information such as slowing down and paying attention to anti-skid. In areas with complex urban roads, pedestrians cannot use navigation to accurately locate themselves, and navigation cannot promptly feedback sudden conditions and sudden changes in weather on the route, resulting in failure to change routes in time and guide pedestrians away from dangerous sources.

[0003] Therefore, there is an urgent need for an intelligent road sign indication system based on route planning, which can accurately and correctly guide pedestrians to their destination along the planned route and evacuate people in case of emergencies.

[0004] Chinese patent application publication number: CN114120631A discloses a method, device and traffic cloud control platform for constructing dynamic high-precision maps. The invention provides a method, device and traffic cloud control platform for constructing dynamic high-precision maps. In the embodiment of the present invention, since the absolute coordinates of each traffic element (for example, vehicles, pedestrians, road signs, etc.) are obtained by fusing multi-source sensor data, the coordinates obtained by a single sensor are more accurate. In addition, the embodiment of the present invention can also obtain dynamic traffic situation data by analyzing multi-source sensor data, and a more comprehensive and realistic traffic condition can be simulated by combining absolute coordinate information and dynamic traffic situation data. Furthermore, the present invention can update the high-precision map data in real time based on the update of multi-source sensor data to obtain a real-time updated and dynamically changing 3D dynamic high-precision map. In the embodiment of the invention, the dynamically updated 3D dynamic high-precision map can also be displayed in real time through the traffic cloud control platform, and the traffic cloud control platform can provide traffic control information to users.

[0005] However, the above method has the following problems: the updated map cannot intuitively guide the user on complex urban roads, and cannot provide effective help when the user is lost. Summary of the invention

[0006] To this end, the present invention provides an intelligent road sign indication system based on route planning to overcome the problem in the prior art that updated maps cannot intuitively guide users on complex urban roads and cannot provide effective help when users are lost.

[0007] To achieve the above object, the present invention provides an intelligent road sign indication system based on route planning, comprising:

[0008] Intelligent road signs, which are installed at road sign points and include direction signs, display touch screens and warning lights, are used to indicate the direction of travel to users and display pictures of travel routes and landmarks, as well as indicate the direction of travel to emergency shelters in emergency situations;

[0009] The direction indicator is located above the display touch screen, and the direction indicator can be rotated at any angle along the vertical axis of the smart road sign, and the marker image is an image of a landmark building, a natural landscape, and a transportation facility;

[0010] A planning unit, which is connected to the intelligent road sign and is used to plan a travel route according to a destination input by a user;

[0011] an interaction unit, which is connected to the intelligent road sign and the planning unit respectively, and is used to receive the destination input by the user and mark the user, and determine whether the user on the travel route deviates from the travel route;

[0012] A cruise drone, which is connected to the interaction unit and the planning unit respectively, for collecting road condition information, and performing occlusion detection on users on different sides of the road and driving the smart road sign to move to the unobstructed road sign point through the interaction unit;

[0013] The road side includes a first road side and a second road side.

[0014] Furthermore, the interaction unit receives the destination input by the user and marks the user at the same time, wherein:

[0015] The interaction unit receives a destination input by a user through touch operation or voice interaction;

[0016] The interaction unit extracts the user's facial features through facial recognition technology and matches the facial features with the destination to mark the user.

[0017] Furthermore, the planning unit plans the travel route according to the destination, wherein:

[0018] The planning unit establishes a road condition model according to road attributes, road condition information and weather conditions;

[0019] The planning unit analyzes the traffic model to select a number of travel routes, and simulates the arrival time of different travel routes;

[0020] The planning unit sorts the arrival times from small to large, and selects the travel route with the shortest arrival time as the travel route;

[0021] The road attributes include the type, location, direction and connection relationship of the road; the road condition information includes traffic congestion and road construction information.

[0022] Furthermore, the interaction unit determines whether the user on the route deviates from the route, wherein:

[0023] The interactive unit records the distance time from the user completing the marking of the last intelligent road sign to the user completing the marking again when the user completes the marking;

[0024] The interaction unit compares the travel time with a first preset time, determines whether the user deviates from the travel route according to the comparison result, and displays the marker image according to the determination result;

[0025] The first preset time is positively correlated with the length of the travel route.

[0026] Furthermore, when the interactive unit of the smart road sign not set on the travel route is marked to the user, the planning unit corresponding to the interactive unit re-plans the travel route.

[0027] Furthermore, the interaction unit determines that the user abandons the route when no marking by the user is received within a second preset time;

[0028] The second preset time is positively correlated with the length of the travel route, and the second preset time is greater than the first preset time.

[0029] Furthermore, the cruise drone scans the surrounding environment within a preset distance range of the smart road signs on the route to generate a route environment model, and determines whether there are obstacles blocking the user from observing the smart road signs, wherein:

[0030] The cruising drone analyzes whether the user is located at the first road side and the second road side respectively and is blocked by the smart road sign within the preset distance;

[0031] The first road side and the second road side are respectively located on two sides of the road of the travel route, and the preset distance is positively correlated with the length of the straight line segment of the travel route where the corresponding smart road sign is located.

[0032] Further, when the cruise drone determines that the user is located at the first road side and / or the second road side and the line of sight between the user and the smart road sign is blocked, the cruise drone determines the road sign point corresponding to the smart road sign that the user is located at the first road side and the second road side and is not blocked by combining the route environment model and reverse line of sight analysis;

[0033] Among them, a single intelligent road sign corresponds to a number of road sign points, and the road sign points are the positions of the intelligent road sign in a working state.

[0034] Furthermore, when the cruise drone determines that all points corresponding to the smart road signs on the first road side and / or the second road side where the user is located are blocked, the cruise drone hovers above the blockage to guide the user.

[0035] Furthermore, when an emergency occurs on the route, the smart road sign turns on the warning light and rotates the direction indicator to point to the direction of the emergency shelter.

[0036] Compared with the prior art, the beneficial effect of the present invention lies in that, by providing a direction sign that can rotate at any angle along the vertical axis on the smart road sign, no matter which direction the pedestrians come from, the rotating direction sign can accurately point the information to them, so that they can quickly obtain the guidance information and avoid misreading or obtaining information due to viewing angle problems. In some special scenarios, such as road construction, temporary traffic control, etc., the rotating direction sign can quickly adjust the direction according to the actual situation to guide pedestrians to avoid dangerous areas or choose the correct detour route. In some areas with limited space, such as narrow streets and small squares, traditional fixed direction signs may not be able to fully display information due to space limitations, while the rotating direction sign can adjust the angle as needed to display more information in a limited space. At the same time, when it is determined that the user is lost, pictures of markers on the route are provided, which effectively improves the accuracy and practicality of the smart road sign while effectively providing path navigation assistance to the user.

[0037] Furthermore, the present invention establishes a road condition model by setting a planning unit and selects a travel route in combination with a simulated arrival time. It can quickly plan an optimal or better travel route according to real-time traffic information, road conditions and destination location. The travel route not only gives an accurate route from the starting point to the end point, but also provides specific direction instructions for each turn and intersection, as well as detailed information such as the remaining distance to the next marker, such as an intersection, a bridge, etc. The travel route can accurately guide the user to the destination, effectively reducing the risk of the user getting lost. While planning the travel route, the planning unit will also monitor the road conditions in real time, and promptly inform the user of unfavorable conditions such as congestion, accidents, road construction, etc. that may occur ahead. The user can make adjustments in advance based on this, such as choosing a detour or slowing down, so as to avoid getting into dangerous or inconvenient road conditions. While ensuring the safety of travel, the accuracy and practicality of the intelligent road signs are further improved.

[0038] Furthermore, the present invention marks the user and determines whether the user has deviated from the route based on the continuous intelligent road signs on the route. For users traveling in unfamiliar environments, deviation from the route can easily lead to getting lost, which may in turn cause a series of safety issues, such as not being able to find the way back in the wilderness, or mistakenly entering a dangerous area in the city. Intelligent road signs can timely determine deviation from the route and give correct guidance, which can effectively reduce the risk of users getting lost and ensure that users can safely reach their destinations during travel, further improving the accuracy and practicality of intelligent road signs.

[0039] Furthermore, the present invention sets a cruise drone to scan the surrounding environment of the smart road sign to generate a route environment model to determine whether there are obstacles blocking the user from observing the smart road sign. When the cruise drone performs a flight mission, by establishing a model to analyze the situation of obstructions, it can accurately identify in advance obstructions such as buildings, trees, vehicles, etc. that may exist on the user's route. By adjusting the setting position of the smart road sign, the user can find the smart road sign. At the same time, when the position of the smart road sign still cannot avoid the obstruction, the cruise drone takes the approach of hovering on the route to guide the user to the next smart road sign position or destination, while providing clear direction guidance, further improving the accuracy and practicality of the smart road sign.

[0040] Furthermore, the present invention sets up intelligent road signs to turn on the alarm lights in an emergency, and rotates the direction indicator to point to the direction of travel of the emergency shelter. The intelligent road signs can quickly plan the optimal route to the safe area for the user based on the real-time monitored emergency situation and surrounding environment information. It can avoid congested sections and dangerous areas, allowing users to evacuate to safe areas at the fastest speed, greatly shortening the overall evacuation time and improving the efficiency of personnel evacuation. As the emergency develops, such as changes in the direction of fire spread and rising flood levels, the intelligent road signs can update the indicated route in real time. It continuously collects and analyzes new data, and timely adjusts the direction of travel instructions to users, ensuring that users always move towards relatively safer areas, and avoiding users from mistakenly entering dangerous areas due to changes in the situation. While ensuring the efficiency of the evacuation process, it further improves the accuracy and practicality of the intelligent road signs. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a structural block diagram of the intelligent road sign indication system based on route planning of the present invention;

[0042] Figure 2 A flow chart of the interactive unit of the present invention for determining that a user deviates from a route;

[0043] Figure 3 A flow chart of planning a travel route according to an embodiment of the present invention;

[0044] Figure 4 This is a structural diagram of an intelligent road sign according to an embodiment of the present invention;

[0045] In the figure: 1, smart road sign, 2, direction sign; 3, display touch screen; 4, warning light; 5, universal wheel; 6, road sign point. DETAILED DESCRIPTION

[0046] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0047] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0048] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0049] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] See also Figure 1 As shown, it is a structural block diagram of an intelligent road sign indication system based on route planning of the present invention. The present invention provides an intelligent road sign indication system based on route planning, including:

[0051] Intelligent road signs, which are installed at road sign points and include direction signs, display touch screens and warning lights, are used to indicate the direction of travel to users and display pictures of travel routes and landmarks, as well as indicate the direction of travel to emergency shelters in emergency situations;

[0052] The direction indicator is located above the display touch screen and can be rotated at any angle along the vertical axis of the smart road sign. The sign images are images of landmark buildings, natural landscapes and transportation facilities.

[0053] A planning unit, which is connected to the intelligent road sign and is used to plan a travel route according to the destination input by the user;

[0054] An interaction unit, which is connected to the intelligent road sign and the planning unit respectively, and is used to receive a destination input by a user and mark the user, and determine whether the user on the travel route deviates from the travel route;

[0055] A cruise drone, which is connected to the interaction unit and the planning unit respectively, is used to collect road condition information, detect occlusion of users on different sides of the road, and drive the intelligent road sign to an unobstructed road sign point through the interaction unit;

[0056] The road side includes a first road side and a second road side.

[0057] Specifically, by setting a direction sign that can rotate at any angle along the vertical axis on the smart road sign, no matter which direction the pedestrians come from, the rotating direction sign can accurately point the information to them, allowing them to quickly obtain guidance information and avoid misinterpretation or difficulty in obtaining information due to viewing angle problems. In some special scenarios, such as road construction, temporary traffic control, etc., the rotating direction sign can quickly adjust its direction according to actual conditions to guide pedestrians to avoid dangerous areas or choose the correct detour route. In some areas with limited space, such as narrow streets and small squares, traditional fixed-direction road signs may not be able to fully display information due to space limitations, while the rotating direction sign can adjust the angle as needed to display more information in a limited space. At the same time, when it is determined that the user is lost, pictures of landmarks on the route are provided, which effectively improves the accuracy and practicality of smart road signs while effectively providing users with path navigation assistance.

[0058] Specifically, the interaction unit receives the destination input by the user and marks the user at the same time, wherein:

[0059] The interaction unit receives a destination input by a user through touch operation or voice interaction;

[0060] The interaction unit extracts the user's facial features through facial recognition technology and matches the facial features with the destination to mark the user.

[0061] In implementation, when the user inputs the destination on the display touch screen, the camera on the display touch screen will be activated, and the camera will automatically adjust the parameters according to the light conditions of the surrounding environment to ensure that a clear image can be obtained. In a dark environment, a flash light may be activated or a special light source such as infrared light may be used to assist in lighting. The camera continuously captures images or video streams and transmits them to the interaction unit. These images or video streams will serve as the basic data for subsequent facial feature recognition. The interaction unit uses an algorithm to analyze the collected images or video streams and extract the area that may contain the face. The interaction unit further determines the exact position and size of the face, and screens multiple possible faces to determine the main target face. After determining the face area, the system will further extract the key feature points of the face, digitize the extracted key feature points, and convert them into a feature vector. This feature vector can be regarded as a mathematical representation of facial features. It contains various feature information of the face and is unique, that is, different faces will generate different feature vectors, thereby marking different users.

[0062] See also Figure 3 As shown, it is a flow chart of planning a travel route according to an embodiment of the present invention, and the steps of the planning unit planning a travel route according to the destination include:

[0063] Step S1, the planning unit establishes a road condition model according to road attributes, road condition information and weather conditions;

[0064] Step S2, the planning unit analyzes the traffic model, selects several travel routes, and simulates the arrival time of different travel routes;

[0065] Step S3, the planning unit sorts the arrival times from small to large, and selects the route with the shortest arrival time as the travel route;

[0066] Road attributes include road type, location, direction and connection relationship; road condition information includes traffic congestion and road construction information.

[0067] In implementation, the planning unit receives the destination information of the user, and establishes a road condition model based on road attributes, road condition information and weather conditions, relying on a large amount of map data to understand the road network, building distribution, traffic facilities, etc. These map data contain many details such as the name, direction, width, grade of the road, as well as the type of intersection, traffic control information, etc. A specific path search algorithm is used to search for all possible routes from the starting point to the end point in the road network constructed by the map data based on the acquired map data and the starting point and end point information. When determining possible route plans, in addition to the connection path between the starting point and the end point, some other factors are also considered, including road grade, traffic control conditions, distance, and arrival time. The planning unit sorts the arrival time from small to large and selects the route with the shortest arrival time as the travel route.

[0068] Specifically, the present invention establishes a road condition model by setting a planning unit and selects a travel route in combination with a simulated arrival time. It can quickly plan the best or better travel route according to real-time traffic information, road conditions and destination location. The travel route not only gives the accurate route from the starting point to the end point, but also provides specific direction instructions for each turn and intersection, as well as detailed information such as the remaining distance to the next landmark, such as an intersection, a bridge, etc. The travel route can accurately guide the user to the destination, effectively reducing the risk of the user getting lost. While planning the travel route, the planning unit will also monitor the road conditions in real time, and promptly inform the user of unfavorable conditions such as congestion, accidents, road construction, etc. that may occur ahead. The user can make adjustments in advance based on this, such as choosing a detour or slowing down, so as to avoid getting into dangerous or inconvenient road conditions. While ensuring the safety of travel, the accuracy and practicality of the intelligent road signs are further improved.

[0069] See also Figure 2 As shown, it is a flow chart of the interactive unit of the present invention determining whether the user deviates from the route, wherein the interactive unit determines whether the user on the route deviates from the route, wherein:

[0070] When the user completes marking, the interactive unit records the travel time from the user completing marking on the last smart road sign to completing marking again;

[0071] The interaction unit compares the travel time with the first preset time, determines whether the user deviates from the travel route according to the comparison result, and displays the marker image according to the determination result;

[0072] In implementation, the first preset time is 10 minutes. When the user completes marking, the interactive unit records the time from the user completing marking the last smart road sign to completing marking again as the journey time. If the journey time is 5 minutes, which is less than the first preset time of 10 minutes, it is determined that the user has not deviated from the route.

[0073] If the journey time of 15 minutes is greater than the first preset time of 10 minutes, it is determined that the user has deviated from the route.

[0074] The first preset time is positively correlated with the length of the travel route.

[0075] It is understandable that the longer the route the user walks, the longer the time consumed and the longer the first preset time.

[0076] Preferably, the travel route is 1 kilometer and the first preset time is 12 minutes;

[0077] The route is 3 kilometers and the first preset time is 20 minutes;

[0078] The travel route is 5 kilometers and the first preset time is 60 minutes.

[0079] Specifically, when the interaction unit of the smart road sign that is not set on the travel route is marked to the user, the planning unit corresponding to the interaction unit re-plans the travel route.

[0080] Please continue reading Figure 2 As shown, it is a flow chart of the interactive unit of the present invention determining that the user deviates from the route. When the interactive unit does not receive a mark from the user within the second preset time, it determines that the user abandons the route.

[0081] In implementation, the first preset time is 12 minutes, and the second preset time is 30 minutes. If the interaction unit does not receive a mark from the user within 30 minutes, it is determined that the user abandons the route.

[0082] The second preset time is positively correlated with the length of the travel route, and the second preset time is greater than the first preset time.

[0083] It is understandable that the longer the route the user walks, the longer the time consumed, the longer the time consumed in the lost state, and the longer the second preset time.

[0084] Preferably, the travel route is 1 kilometer and the second preset time is 30 minutes;

[0085] The route is 3 kilometers and the second preset time is 40 minutes;

[0086] The travel route is 5 kilometers and the second preset time is 90 minutes.

[0087] Specifically, the present invention marks the user and determines whether the user has deviated from the route based on the continuous intelligent road signs on the route. For users traveling in unfamiliar environments, deviation from the route can easily lead to getting lost, which may in turn cause a series of safety issues, such as not being able to find the way back in the wilderness, or mistakenly entering a dangerous area in the city. Intelligent road signs can timely determine deviations from the route and give correct guidance, which can effectively reduce the risk of users getting lost and ensure that users can safely reach their destinations during travel, further improving the accuracy and practicality of intelligent road signs.

[0088] Specifically, the cruise drone scans the surrounding environment within a preset distance range of the smart road signs on the route to generate a route environment model and determines whether there are obstacles blocking the user from observing the smart road signs.

[0089] The cruise drone analyzes whether the user is located on the first road side and the second road side and is blocked by the smart road sign within a preset distance;

[0090] During implementation, the cruise drone uses a laser radar to emit a laser beam and measure the time it takes for the laser to go back and forth to determine the distance between the object and the cruise drone. The cruise drone is equipped with a laser radar to continuously scan the surrounding environment during flight and obtain a large amount of three-dimensional point cloud data. These point cloud data contain information such as the spatial position, shape, and size of the object, which is the basis for building an environmental model. At the same time, the camera on the cruise drone can capture images of the surrounding environment. By analyzing and processing continuously captured images, it can obtain information such as the characteristics, texture, and color of objects in the environment. Based on computer vision technology, the three-dimensional spatial position of the object can be calculated by matching feature points in the image and using stereo vision algorithms, thereby constructing a partial environmental model. The cruise drone is also equipped with an ultrasonic sensor for close-range object detection and obstacle avoidance. The inertial measurement unit (IMU) can measure information such as the acceleration, angular velocity, and attitude of the cruise drone, which helps to accurately estimate the position and motion state of the cruise drone, and then generate an accurate three-dimensional model.

[0091] The first road side and the second road side are located on both sides of the road of the travel route respectively, and the preset distance is positively correlated with the length of the straight line segment of the travel route where the corresponding intelligent road sign is located.

[0092] It is understandable that the objects that a user can observe on a straight path are farther away, and the longer the straight segment of the route where the smart road sign is located is, the farther the user can observe the smart road sign.

[0093] Preferably, when the length of the straight line segment of the route where the smart road sign is located is 100 meters, the preset distance is 80 meters;

[0094] When the length of the straight section of the route where the smart road sign is located is 300 meters, the preset distance is 200 meters;

[0095] When the length of the straight section of the route where the smart road sign is located is 500 meters, the preset distance is 300 meters.

[0096] Specifically, the present invention sets a cruise drone to scan the surrounding environment of the smart road sign to generate a route environment model to determine whether there are obstacles blocking the user from observing the smart road sign. When the cruise drone performs a flight mission, by establishing a model to analyze the situation of obstructions, it can accurately identify in advance obstructions such as buildings, trees, vehicles, etc. that may exist on the user's route. By adjusting the setting position of the smart road sign, the user can find the smart road sign. At the same time, if the position of the smart road sign still cannot avoid the obstruction, the cruise drone takes the approach of hovering on the route to guide the user to the next smart road sign position or destination, while providing clear direction guidance, further improving the accuracy and practicality of the smart road sign.

[0097] Specifically, when the cruise drone determines that the user is located on the first road side and / or the second road side and the line of sight between the user and the smart road sign is blocked, the cruise drone determines the road sign point corresponding to the smart road sign that the user is located on the first road side and the second road side and is not blocked by combining the route environment model and the reverse line of sight analysis;

[0098] In practice, after the camera on the cruise drone obtains the real-time picture, it can use advanced image recognition algorithms to identify and classify the objects in the picture. If the specific objects that people may observe (such as specific buildings, signboards, etc.) are known in advance, the cruise drone can search for these target objects in the picture through the image recognition system during flight. Once the target object is identified, combined with the current parameters such as the flight altitude and angle of the cruise drone, it can be inferred whether the object can be seen from the human perspective and the approximate range of observation angles. At the same time, the cruise drone analyzes the position, shape, size and other characteristics of the object in the picture, combined with some basic laws of human vision (such as the range of human vision, the law of perspective change, etc.), it can further simulate the line of sight when humans observe the object. According to the relative position of the object in the picture and the shooting angle of the cruise drone, it is determined how much the human eye may need to turn left or right, how much the head may need to be raised or lowered, etc. in order to see the object, so as to reversely determine the situation of the human perspective observation of the object.

[0099] Among them, a single intelligent road sign corresponds to a number of road sign points, and the road sign points are the positions of the intelligent road sign in a working state.

[0100] It is understandable that the road sign is equipped with a buried geomagnetic sensor. When a ferromagnetic object is parked above it, it will cause changes in the surrounding magnetic field. The geomagnetic sensor has a highly sensitive magnetic sensor inside, which can accurately sense the subtle changes in the magnetic field. Usually, it sets the initial state of the earth's magnetic field as a reference value. When the smart road sign is above the road sign, when the magnetic field changes and deviates from the reference value to a certain extent, the sensor will determine that there is a smart road sign at the road sign. When the smart road sign leaves the road sign, the magnetic field returns to a state close to the reference value, and it is determined that the smart road sign has left.

[0101] It is understandable that adjacent road sign points can be connected by setting up buried tracks and combining them with traffic lights, so that the traffic lights can be moved between corresponding road sign points.

[0102] Specifically, when it is determined that all points corresponding to the smart road signs on the first road side and / or the second road side where the user is located are blocked, the cruise drone hovers above the blocks to guide the user.

[0103] In practice, when a user walks on the route, he or she will randomly appear on either side of the road. The cruise drone will comprehensively determine the unobstructed road sign points on both sides of the road, and drive the smart road sign to move to the unobstructed road sign points. If the cruise drone determines that all points corresponding to the smart road sign are obstructed, the cruise drone will hover above the obstruction, and by installing a direction sign under the cruise drone and adjusting the direction sign under the cruise drone through the rotation of the cruise drone itself, the user will be guided to the next smart road sign.

[0104] Specifically, when an emergency occurs on the route, the smart road sign turns on the alarm light and rotates the direction sign to point to the direction of the emergency shelter.

[0105] In practice, cruise drones can take clear images of the road surface in real time through high-definition cameras. These cameras can cover a large field of view and observe the road surface from different angles. During road inspections, the cameras can capture cracks, potholes, water accumulation, etc. on the road surface, as well as the driving status of vehicles on the road and whether there are traffic accidents. At the same time, cruise drones also carry infrared thermal imagers that can sense temperature differences on the surface of objects. During road inspections, it can detect abnormally high temperature points caused by vehicle failures, or find ground temperature changes caused by underground pipeline leaks. These temperature anomalies may often indicate potential emergencies. Infrared thermal imagers have unique advantages at night or in low visibility conditions. They can continue to monitor the road surface effectively without being affected by light and detect possible emergencies in a timely manner. Based on the acquired emergency and environmental information, smart road signs use built-in route planning algorithms to quickly plan the best evacuation route for people to a safe area. These algorithms take into account factors such as road traffic conditions, the distribution of buildings, and the capacity of different safety areas to ensure the rationality and efficiency of evacuation routes. As the emergency situation continues to develop and change, the smart road sign will update the planned evacuation route in real time. It continuously collects and analyzes new data to adjust the direction of travel for the crowd in a timely manner, ensuring that the crowd always moves towards a relatively safer area and avoids mistakenly entering a dangerous area due to changes in the situation. Smart road signs use eye-catching display methods such as high-brightness LED touch screens and luminous direction signs to ensure that the crowd can clearly see the indicated evacuation direction in harsh emergency environments such as dense smoke and dim light. Smart road signs also have a voice prompt function. It will inform the crowd of the evacuation direction with a clear and loud voice.

[0106] See also Figure 4 As shown, it is a structural diagram of an intelligent road sign according to an embodiment of the present invention;

[0107] In practice, the intelligent road sign 1 includes a direction sign 2, a display touch screen 3, an alarm light 4 and a universal wheel 5; the direction sign 2 is arranged on the upper part of the intelligent road sign 1, the display touch screen 3 is arranged in the middle part of the intelligent road sign 1, the alarm light 4 is arranged on the top of the intelligent road sign 1, the universal wheel 5 is arranged at the bottom of the intelligent road sign 1, and the road sign point 6 is buried and arranged below the intelligent road sign 1. The direction sign 2 can be rotated to any angle along the vertical axis, the display touch screen 3 is connected to the interaction unit, and can assist the interaction unit in receiving the destination input by the user and marking the user at the same time, the alarm light 4 emits an audible and visual alarm in an emergency, prompting people to stay away from the dangerous area, and the universal wheel 5 can adjust the position of the intelligent road sign when the cruise drone finds an obstruction on the user's route.

[0108] Specifically, the present invention sets up intelligent road signs to turn on the alarm lights in an emergency, and rotates the direction indicator to point to the direction of travel of the emergency shelter. The intelligent road signs can quickly plan the optimal route to the safe area for users based on the real-time monitored emergency and surrounding environment information. It can avoid congested sections and dangerous areas, allowing users to evacuate to safe areas at the fastest speed, greatly shortening the overall evacuation time and improving the efficiency of personnel evacuation. With the development of the emergency, such as the change in the direction of fire spread and the rise in flood water levels, the intelligent road signs can update the indicated route in real time. It continuously collects and analyzes new data, and timely adjusts the direction of travel for users to ensure that users always move towards relatively safer areas, avoiding users from mistakenly entering dangerous areas due to changes in the situation. According to the capacity of different safe areas, the current evacuation pressure in various directions and other factors, the intelligent road signs will reasonably divert the crowd. It will instruct some people to evacuate to a safe area in one direction, and others to evacuate to a safe area in another direction, so as to balance the load of people in each safe area, prevent a safe area from being overcrowded or even endangering lives due to too many people, and ensure the orderly evacuation process. While ensuring the efficiency of the evacuation process, it further improves the accuracy and practicality of the smart road sign.

[0109] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. An intelligent road sign indication system based on route planning, characterized in that: include: Intelligent road signs, which are installed at road sign points and include direction signs, display touch screens and warning lights, are used to indicate the direction of travel to users and display pictures of travel routes and landmarks, as well as indicate the direction of travel to emergency shelters in emergency situations; The direction indicator is located above the display touch screen, and the direction indicator can be rotated at any angle along the vertical axis of the smart road sign, and the marker image is an image of a landmark building, a natural landscape, and a transportation facility; A planning unit, which is connected to the intelligent road sign and is used to plan a travel route according to a destination input by a user; an interaction unit, which is connected to the intelligent road sign and the planning unit respectively, and is used to receive the destination input by the user and mark the user, and determine whether the user on the travel route deviates from the travel route; A cruise drone, which is connected to the interaction unit and the planning unit respectively, for collecting road condition information, determining whether there are obstacles blocking users on different sides of the road from observing the smart road sign, and driving the smart road sign to move to the unobstructed road sign point through the interaction unit; The road side includes a first road side and a second road side.

2. The intelligent road sign indication system based on route planning according to claim 1 is characterized in that: The interaction unit receives the destination input by the user and marks the user at the same time, wherein: The interaction unit receives a destination input by a user through touch operation or voice interaction; The interaction unit extracts the user's facial features through facial recognition technology and matches the facial features with the destination to mark the user.

3. The intelligent road sign indication system based on route planning according to claim 1 is characterized in that: The planning unit plans the travel route according to the destination, wherein: The planning unit establishes a road condition model according to road attributes, road condition information and weather conditions; The planning unit analyzes the traffic model to select a number of travel routes, and simulates the arrival time of different travel routes; The planning unit sorts the arrival times from small to large, and selects the travel route with the shortest arrival time as the travel route; The road attributes include the type, location, direction and connection relationship of the road; the road condition information includes traffic congestion and road construction information.

4. The intelligent road sign indication system based on route planning according to claim 3 is characterized in that: The interaction unit determines whether a user on a travel route deviates from the travel route, wherein: The interactive unit records the distance time from the user completing the marking of the last intelligent road sign to the user completing the marking again when the user completes the marking; The interaction unit compares the travel time with a first preset time, determines whether the user deviates from the travel route according to the comparison result, and displays the marker image according to the determination result; The first preset time is positively correlated with the length of the travel route.

5. The intelligent road sign indication system based on route planning according to claim 4 is characterized in that: In a state where the interactive unit of the intelligent road sign not set on the travel route is marked to the user, the planning unit corresponding to the interactive unit re-plans the travel route.

6. The intelligent road sign indication system based on route planning according to claim 5, characterized in that: The interaction unit determines that the user abandons the route when no marking by the user is received within a second preset time; The second preset time is positively correlated with the length of the travel route, and the second preset time is greater than the first preset time.

7. The intelligent road sign indication system based on route planning according to claim 6, characterized in that: The cruise drone scans the surrounding environment within a preset distance range of the smart road signs on the route to generate a route environment model, and determines whether there are obstacles blocking the user from observing the smart road signs, wherein: The cruising drone analyzes whether the user is located at the first road side and the second road side respectively and is blocked by the smart road sign within the preset distance; The first road side and the second road side are respectively located on both sides of the road of the travel route, and the preset distance is positively correlated with the length of the straight line segment of the travel route where the corresponding smart road sign is located.

8. The intelligent road sign indication system based on route planning according to claim 7, characterized in that: When determining that the user is located on the first road side and / or the second road side and the line of sight between the user and the smart road sign is blocked, the cruise drone determines the road sign point corresponding to the smart road sign where the user is located on the first road side and the second road side and is not blocked by combining the route environment model and reverse line of sight analysis; Among them, a single intelligent road sign corresponds to a number of road sign points, and the road sign points are the positions of the intelligent road sign in a working state.

9. The intelligent road sign indication system based on route planning according to claim 8, characterized in that: When determining that the user is located at the first road side and / or all points corresponding to the smart road signs at the second road side are blocked, the cruise drone hovers above the blocking objects to guide the user.

10. The intelligent road sign indication system based on route planning according to claim 9, characterized in that: When an emergency occurs on the route, the intelligent road sign turns on the warning light and rotates the direction indicator to point to the direction of the emergency shelter.

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