Holographic guiding device and system on traffic indication frame

Abstract

The invention relates to the technical field of traffic guidance, and discloses a holographic guidance device and system on a traffic indication frame, and the device comprises a holographic projection unit, an environment perception unit, and a control decision unit. Wherein the holographic projection unit carries out holographic projection on traffic guidance information based on a set projection period; the environment sensing unit is used for collecting environment illumination intensity and environment visibility; a control decision unit adjusts the projection brightness of the holographic projection based on the environment illumination intensity and the environment visibility; the environment sensing unit is also used for acquiring real-time traffic data; and the control decision unit adjusts the projection time proportion of each kind of traffic guidance information in the projection period based on the real-time traffic data. According to the invention, the traffic guidance information can be vividly and visually displayed, and the traffic guidance information can be ensured to be clear and visible under different time and weather conditions.

Description

Technical Field

[0001] The present application relates to the technical field of traffic guidance, and in particular to a holographic guidance device and system on a traffic sign frame. Background Art

[0002] Although traditional traffic signs can provide basic traffic rules information such as speed limits, no overtaking, and intersection turns, they are static and cannot be dynamically adjusted according to factors such as traffic flow, weather conditions, or emergencies. Some cities use electronic display screens to display real-time road conditions and traffic information. Although electronic display screens can provide dynamic information, they are expensive to install and maintain, and are limited by the display area and viewing angle range. At complex traffic intersections or multi-lane roads, drivers may not be able to obtain key information from electronic display screens in a short period of time, especially when driving at high speeds or in heavy traffic.

[0003] Existing technologies cannot automatically adjust display parameters according to environmental changes. In strong direct light or low light environments, the visibility of traffic signs and signal lights will be greatly affected, which may make it difficult for drivers to see the information clearly, increasing traffic risks. In addition, traditional traffic sign equipment cannot dynamically select more important sign information based on real-time traffic data, and cannot flexibly meet the driver's needs for key information in different traffic scenarios.

[0004] For example, a Chinese patent application with publication number CN113724512A discloses a holographic traffic light system, including a panoramic camera, a microwave vehicle inspection, a PM2.5 detector, a vibration detector, a computing unit, a remote communication module, and a power module; the panoramic camera, microwave vehicle inspection, PM2.5 detector, vibration detector, computing unit, remote communication module, and power module are integrated and installed on the traffic light, the panoramic camera, microwave vehicle inspection, PM2.5 detector, vibration detector are connected to the computing unit, the computing unit is connected to the remote communication module and establishes remote communication with a third-party platform, the power module supplies power to the holographic traffic light system, and the holographic traffic light system integrates the functions of road panoramic camera, microwave vehicle inspection, air quality analysis, and earthquake monitoring, providing a powerful basic traffic measure for the application of smart cities, making full use of the best position of the road to collect road safety information and life safety information, and promoting the construction of smart cities.

[0005] For example, a Chinese patent application with publication number CN104064047A discloses a holographic projection red light, including a light frame, a crossbar installed on the upper part of the light frame, a green light, a yellow light and a red light installed on the crossbar, a laser machine installed on the lower part of the light frame, a laser head installed in the laser machine, the laser head connected to the laser beam, and the laser beam is set on the ground below the crossbar. This application allows people to instinctively stop at a red light. A laser machine is installed at the intersection at the lower part of the light frame. When the light is red, projections can be projected on the road to form a barrier similar to a wall. On rainy days, a loudspeaker can be added to the laser machine. When congestion or traffic jam occurs, the laser machine can also be launched into a traffic warning command mode.

[0006] The above applications all have the problem raised by the background technology: the display parameters cannot be automatically adjusted according to the changes in the environment, and the visibility of traffic signs and signal lights will be affected in strong direct light or weak light environments.

[0007] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the application and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to ordinary technicians in the field. Summary of the invention

[0008] The technical problem to be solved by the present application is to overcome the defects of the prior art and provide a holographic guidance device and system on a traffic sign, which vividly and intuitively displays traffic guidance information and ensures that the traffic guidance information is clearly visible under different time and weather conditions.

[0009] In order to solve the above technical problems, this application provides the following technical solutions:

[0010] On the one hand, the present application provides a holographic guidance device on a traffic sign, comprising a holographic projection unit, an environment perception unit, and a control decision unit; wherein:

[0011] The holographic projection unit holographically projects the traffic guidance information based on a set projection period;

[0012] The environment sensing unit is used to collect the environment light intensity and the environment visibility; the control decision unit adjusts the projection brightness of the holographic projection based on the environment light intensity and the environment visibility;

[0013] The environment perception unit is also used to obtain real-time traffic data; the control decision unit adjusts the projection time proportion of each type of traffic guidance information in the projection cycle based on the real-time traffic data.

[0014] As a preferred solution of the holographic guidance device on the traffic sign stand described in the present application, wherein: the holographic projection unit includes a projection subunit and an image production subunit;

[0015] The projection subunit is equipped with a holographic projector and a holographic projection film; the projection subunit is used to project the holographic projection image produced by the image production subunit to a designated position;

[0016] The traffic guidance information includes traffic rules information, road congestion information, driving guidance information, pedestrian warning information, and weather-related information.

[0017] The projection cycle is the time period for each type of traffic guidance information to complete a cycle of holographic projection; each type of traffic guidance information is provided with a corresponding projection time ratio; the projection time ratio is the ratio of the duration of holographic projection of the corresponding traffic guidance information in a projection cycle to the total duration of the projection cycle; in any projection cycle, the holographic projector projects each type of traffic guidance information in turn based on the projection time ratio of each type of traffic guidance information.

[0018] As a preferred solution of the holographic guidance device on the traffic sign frame described in the present application, wherein: the environment perception unit includes a first perception subunit and a second perception subunit;

[0019] The first sensing subunit includes a light intensity sensor for collecting ambient light intensity; the second sensing subunit includes a visibility sensor for collecting ambient visibility.

[0020] The control decision unit includes a brightness control subunit; the brightness control subunit is used to adjust the projection brightness of the holographic projection, specifically including:

[0021] S1: Determine the fusion weight of ambient light intensity and ambient visibility based on the current time tag;

[0022] S2: Calculate the environmental disturbance factor based on the fusion weight of ambient light intensity and ambient visibility;

[0023] S3: Adjusting the projection brightness of the holographic projection based on the environmental disturbance factor.

[0024] As a preferred solution of the holographic guidance device on the traffic sign frame described in the present application, wherein: the time label includes daytime and nighttime; the brightness control subunit determines the current time label based on the current time point; the brightness control subunit is configured with a weight setting strategy, and the weight setting strategy specifically includes:

[0025] Let the fusion weight of ambient light intensity be w1, and the fusion weight of ambient visibility be w2, and the sum of w1 and w2 is always 1;

[0026] If the current time tag is daytime, the fusion weight w1 of the ambient light intensity is w i0 , the fusion weight w2 of the environmental visibility is w v0 ;

[0027] If the current time tag is nighttime, the fusion weight w1 of the ambient light intensity is w i1 , the fusion weight w2 of the environmental visibility is w v1 ;

[0028] The second perception subunit is configured with a minimum visibility threshold; if the ambient visibility is lower than the minimum visibility threshold, the second perception subunit sends a low visibility notification to the brightness control subunit; the weight setting strategy also includes: if a low visibility notification is received, the fusion weight w1 of the ambient light intensity is set to w i2 , the fusion weight w2 of the environmental visibility is w v2 .

[0029] As a preferred solution of the holographic guidance device on the traffic sign frame described in the present application, wherein: calculating the environmental disturbance factor based on the fusion weight of the ambient light intensity and the ambient visibility specifically includes: setting the maximum reference value of the ambient light intensity, denoted as I max ; Set the maximum reference value of environmental visibility, denoted as V max ; The calculation formula of the environmental disturbance factor is as follows:

[0030]

[0031] Among them, F represents the environmental disturbance factor; I represents the ambient light intensity; and V represents the ambient visibility.

[0032] As a preferred solution of the holographic guidance device on the traffic sign frame described in the present application, wherein: the adjustment of the projection brightness of the holographic projection specifically includes: setting the initial projection brightness, recorded as L0; setting the maximum projection brightness, recorded as L max ; Set the maximum reference value of the environmental disturbance factor, denoted as F max ; Set the minimum reference value of the environmental disturbance factor, denoted as F min ; The brightness control subunit uses linear interpolation based on L0, L max 、F min 、F max And the environmental disturbance factor F adjusts the projection brightness of the holographic projection.

[0033] As a preferred solution of the holographic guidance device on the traffic sign frame described in the present application, wherein: the environment perception unit further includes a query subunit; the query subunit is used to obtain real-time traffic data from a cloud server; the real-time traffic data includes congestion data, average vehicle speed, and number of pedestrians; wherein the congestion data includes the total length of the congested road section and the estimated congestion duration;

[0034] The control decision unit also includes a projection strategy subunit; the projection strategy subunit is used to adjust the projection time proportion of each type of traffic guidance information in the projection cycle;

[0035] The projection strategy subunit is configured with a first adjustment strategy, specifically including: obtaining the congestion data and the average vehicle speed; the projection strategy subunit is also configured with a high threshold of congestion length and a high threshold of congestion time; if the total length of the congested road section is greater than the high threshold of congestion length, or the estimated congestion time is greater than the high threshold of congestion time, then increasing the projection time proportion of the road congestion information and driving guidance information;

[0036] The projection strategy subunit is also configured with a low threshold for congestion length, a low threshold for congestion time and a vehicle speed threshold; if the total length of the congested road section is less than the low threshold for congestion length, and the expected congestion duration is less than the low threshold for congestion time, and the average vehicle speed is greater than the vehicle speed threshold, then the projection time proportion of the traffic rules information and weather-related information is increased.

[0037] As a preferred solution of the holographic guidance device on the traffic sign frame described in the present application, the projection strategy subunit is also configured with a second adjustment strategy, specifically including:

[0038] Based on the query subunit, historical pedestrian data is obtained from the cloud server; statistical analysis is performed on the historical pedestrian data to identify the peak time periods and trough time periods of the number of pedestrians every day; the number of pedestrians is obtained; the projection strategy subunit is also configured with a high threshold for the number of people. If the current moment is in the peak time period and the number of pedestrians is greater than the high threshold for the number of people, the projection time proportion of the pedestrian warning information is increased.

[0039] As a preferred solution of the holographic guidance device on the traffic sign described in the present application, wherein: the second perception sub-unit is configured with a minimum light intensity threshold of the ambient light intensity; if the ambient light intensity is lower than the minimum light intensity threshold, the second perception sub-unit sends a low-light notification to the projection strategy sub-unit; the projection strategy sub-unit is also configured with a third adjustment strategy, and when the low-light notification is received, the third adjustment strategy is triggered, which is as follows: if the current moment is not in the low time period, the projection time proportion of the pedestrian warning information is increased.

[0040] In a second aspect, the present application provides a holographic guidance system, including a data acquisition module, a cloud server, and a holographic guidance device on a traffic sign as described in the present application.

[0041] The data collection module is used to collect traffic flow, average vehicle speed, number of pedestrians, and upload them to the cloud server;

[0042] The cloud server calculates the total length of the congested road section and the estimated congestion duration based on the traffic volume and average vehicle speed; the cloud server also stores traffic guidance information;

[0043] The holographic guidance device obtains traffic guidance information from the cloud server and performs holographic projection on the traffic guidance information; the holographic guidance device is also used to obtain the total length of the congested road section, the expected congestion duration, the average vehicle speed, the number of pedestrians from the cloud server, and adjust the projection time proportion of each type of traffic guidance information.

[0044] Compared with the prior art, the beneficial effects achieved by this application are as follows:

[0045] This application uses holographic projection, which can display more vivid and intuitive traffic information, and has more advantages than traditional signs. By processing traffic guidance information through image production software, it is possible to achieve layered production, control the projection order and duration, and optimize the brightness according to lighting conditions to ensure that traffic information is clearly visible at different times and weather conditions. The projection brightness of the holographic projection is adjusted based on the ambient light intensity and visibility, so that the projection information can be clearly and eye-catchingly presented to the driver under direct strong light, low light environment and different visibility conditions, thereby improving the visibility and accuracy of traffic instructions. By obtaining real-time traffic data and adjusting the projection time proportion of each type of traffic guidance information in the projection cycle accordingly, the display of traffic guidance information can be more in line with the actual traffic conditions and better serve the driver. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0047] Figure 1 A schematic diagram of the structure of a holographic guidance device on a traffic sign provided in this application;

[0048] Figure 2 A flow chart of the method for adjusting the projection brightness of a holographic projection provided in this application. DETAILED DESCRIPTION

[0049] The technical solution of the present application is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations on the technical solution of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0050] Example 1

[0051] This embodiment introduces a holographic guidance device on a traffic sign. Figure 1, the device includes a holographic projection unit, an environment perception unit, and a control decision unit; wherein:

[0052] The holographic projection unit holographically projects the traffic guidance information based on a set projection period;

[0053] The holographic projection unit includes a projection subunit and an image production subunit;

[0054] The image production subunit is equipped with image production software for producing the traffic guidance information into a holographic projection screen; these professional image production software can convert materials such as three-dimensional models and animations into a format suitable for holographic projection. For example, a three-dimensional traffic indication arrow model can be rendered by software, and light and shadow effects can be added to make it more in line with the visual requirements of holographic projection. These image production software can also realize the layering of holographic images; for example, when producing a holographic projection containing a variety of traffic guidance information, different types of traffic guidance information can be produced in layers, and the order and duration of their projection can be controlled. According to the lighting conditions of the projection environment, the image production subunit can also optimize the brightness of the holographic image based on the instructions of the control decision unit. For example, in a brighter environment, the projection brightness is appropriately increased; the brightness can be optimized by adjusting the pixel value of the image.

[0055] The projection subunit is equipped with a holographic projector and a holographic projection film; the projection subunit is used to project the holographic projection image produced by the image production subunit to a designated position. The holographic projection film is a special optical film that realizes the holographic projection effect based on the principle of reflection and refraction. Its surface has a microstructure or a special optical coating, which can accurately control the light. When the light projected by the holographic projector is irradiated on the projection film, part of the light is reflected and the other part of the light passes through the film. By adjusting the optical parameters and projection angle of the film, the reflected light and the transmitted light can interfere with each other, so as to form a holographic image at a specific angle and position, creating an effect of a virtual image suspended in the air. The projection film can be fixed using a frame structure. For example, an aluminum alloy frame is used to fix the projection film therein and the frame is fixed to the traffic sign frame by bolts or clamps. Compared with traditional signs, holographic projection can display more vivid and intuitive traffic information, such as dynamic lane change instructions, three-dimensional speed limit signs, etc. At different times and under different weather conditions, the parameters such as projection brightness can be adjusted to ensure that traffic information is clear and visible.

[0056] The traffic guidance information includes traffic rules information, road congestion information, driving guidance information, pedestrian warning information, and weather-related information.

[0057] Each of the above traffic guidance information is specifically set according to the actual situation of the road section where the holographic guidance device is located. The specific setting methods of some optional traffic guidance information are as follows:

[0058] Traffic rule information is the basic traffic rules for the road section where the holographic guidance device is located, for example, including at least one of speed limit, height limit, weight limit, no U-turn, no overtaking or other road traffic rules. Traffic rule information is holographically projected in the form of clear text and icons. For example, on a speed-limited road section, a striking digital speed limit value (such as "60km / h") is projected with a circular speed limit sign icon.

[0059] Traffic congestion information is used to inform the holographic guidance device of the road conditions ahead, including the location and degree of congestion of the congested road section. The degree of road congestion is indicated by lines or graphics of different colors. For example, red indicates severe congestion, yellow indicates slow speed, and green indicates smooth traffic, which is projected on the road schematic diagram.

[0060] The driving guidance information is the lane change information or key hub information in front of the holographic guidance device, for example, including at least one of intersection turns, lane merging or diverging, emergency lanes, parking lots, toll booths, service areas or other traffic hubs. For example, the holographic guidance device near the intersection or where the lane needs to be changed according to the road conditions ahead projects arrows and text prompts, such as "Please change to the left lane in advance."

[0061] The pedestrian warning information is used to warn the holographic guidance device that there is at least one of a crosswalk, a scenic spot, a school or other places where people gather in front of it. For example, the holographic guidance device near the sidewalk can project a text message of "give way to pedestrians" and a flashing zebra crossing pattern to remind the driver to pay attention to pedestrians.

[0062] Weather-related information is used to indicate the impact of bad weather on road conditions, including, for example, slippery road surface reminders in rainy days, turning on fog lights and keeping safe distance in foggy days, slowing down in snowy days, driving slowly on icy roads, or at least one of other weather-related information.

[0063] The projection cycle is the time period for each traffic guidance information to complete a holographic projection cycle; each traffic guidance information is provided with a corresponding projection time ratio; the projection time ratio is the ratio of the duration of the corresponding traffic guidance information being holographically projected in a projection cycle to the total duration of the projection cycle; in any projection cycle, the holographic projector projects each traffic guidance information in sequence based on the projection time ratio of each traffic guidance information. The length of the projection cycle can be set to 1-3 minutes. In each projection cycle, through precise time control, it is ensured that each traffic guidance information is projected within the specified time, and smooth switching between different projection content information is achieved to avoid visual interference to the driver caused by sudden changes in the picture.

[0064] The environment sensing unit is used to collect the environment light intensity and the environment visibility; the control decision unit adjusts the projection brightness of the holographic projection based on the environment light intensity and the environment visibility;

[0065] The environment sensing unit includes a first sensing subunit and a second sensing subunit;

[0066] The first sensing subunit includes a light intensity sensor for collecting ambient light intensity; a light intensity sensor such as a photodiode or a silicon photocell can convert the received light signal into an electrical signal, and determine the ambient light intensity by measuring the intensity of the electrical signal. Multiple light intensity sensors are installed at different locations of the traffic sign (such as the top and side) to obtain a comprehensive ambient light intensity to avoid measurement errors caused by local occlusion.

[0067] The second sensing subunit includes a visibility sensor for collecting environmental visibility. Commonly used visibility sensors are based on the principle of light scattering and estimate visibility by measuring the degree of light scattering in the atmosphere. When there are more particles in the air, the scattering of light is enhanced, and the sensor calculates the visibility value accordingly.

[0068] The control decision unit includes a brightness control subunit; Figure 2 , the brightness control subunit is used to adjust the projection brightness of the holographic projection, specifically including:

[0069] S1: Determine the fusion weight of ambient light intensity and ambient visibility based on the current time tag;

[0070] The time label includes daytime and nighttime; the brightness control subunit determines the current time label based on the current time point; the brightness control subunit is configured with a weight setting strategy, and the weight setting strategy specifically includes:

[0071] Let the fusion weight of ambient light intensity be w1, and the fusion weight of ambient visibility be w2, and the sum of w1 and w2 is always 1;

[0072] If the current time tag is daytime, the fusion weight w1 of the ambient light intensity is w i0 , the fusion weight w2 of the environmental visibility is w v0 ;

[0073] If the current time tag is nighttime, the fusion weight w1 of the ambient light intensity is w i1 , the fusion weight w2 of the environmental visibility is w v1 ;

[0074] The second perception subunit is configured with a minimum visibility threshold; if the ambient visibility is lower than the minimum visibility threshold, the second perception subunit sends a low visibility notification to the brightness control subunit; the weight setting strategy also includes: if a low visibility notification is received, the fusion weight w1 of the ambient light intensity is set to w i2 , the fusion weight w2 of the environmental visibility is w v2 .

[0075] Generally speaking, the ambient light intensity during the day varies greatly, which has a dominant influence on the effect of holographic projection. Therefore, when the time tag is daytime, you can set w i0 is 0.7, w v0 The ambient light intensity at night is generally low and does not change significantly. The ambient visibility has a greater impact on the effect of holographic projection, so w can be set i1 is 0.4, w v1 When some extreme weather conditions occur, such as heavy fog, sandstorms, etc., the visibility of the environment will drop sharply. At this time, the effect of adjusting the projection brightness based on the ambient light intensity is not good. The focus should be on adjusting the projection brightness based on the ambient visibility. Therefore, w can be set i2 is 0.2, w v2 is 0.8.

[0076] S2: Calculate the environmental disturbance factor based on the fusion weight of ambient light intensity and ambient visibility; set the maximum reference value of ambient light intensity, denoted as I max ; Set the maximum reference value of environmental visibility, denoted as V max ; The calculation formula of the environmental disturbance factor is as follows:

[0077]

[0078] Among them, F represents the environmental disturbance factor; I represents the ambient light intensity; V represents the ambient visibility. In the above formula, represents the normalized value of the ambient light intensity, so that the environmental disturbance factor F is positively correlated with the ambient light intensity I; Represents the normalized value of environmental visibility. After multiplying by -1, the environmental disturbance factor F is negatively correlated with environmental visibility. The lower the visibility, the greater the environmental disturbance factor. By weighting and summing these two items through the weight fusion coefficient, it can comprehensively reflect the impact of the environment on the visual effect of the projection according to the actual conditions of light intensity and visibility in different scenes.

[0079] S3: adjusting the projection brightness of the holographic projection based on the environmental disturbance factor; specifically including: setting the initial projection brightness, denoted as L0; setting the maximum projection brightness, denoted as L max ; Set the maximum reference value of the environmental disturbance factor, denoted as Fmax ; Set the minimum reference value of the environmental disturbance factor, denoted as F min ; The brightness control subunit adjusts the projection brightness of the holographic projection through linear interpolation, and the formula is as follows:

[0080]

[0081] Among them, L represents the projection brightness of the adjusted holographic projection. This projection brightness adjustment method can reasonably and comprehensively consider the influence of light intensity and visibility, so that the adjustment of projection brightness is more in line with actual visual perception and logic. For example, in a bad weather scene with moderate light intensity but low visibility, the environmental disturbance factor F will take a larger value based on the dominance of visibility, so the projection brightness L calculated by the linear interpolation formula will also increase accordingly to compensate for the poor visual effect caused by low visibility.

[0082] By collecting ambient light information in real time through sensors, the ambient light intensity and visibility are automatically sensed, and the projection brightness is automatically adjusted based on the ambient light information. The information projected by the holographic guidance device can be presented to the driver clearly and eye-catchingly in direct strong light, low light environment and different visibility conditions, thereby improving the visibility and accuracy of traffic instructions.

[0083] The environment perception unit is also used to obtain real-time traffic data; the control decision unit adjusts the projection time proportion of each type of traffic guidance information in the projection cycle based on the real-time traffic data.

[0084] The environmental perception unit also includes a query subunit; the query subunit is used to obtain real-time traffic data from a cloud server; the real-time traffic data includes congestion data, average vehicle speed, and the number of pedestrians; wherein the congestion data includes the total length of the congested road section and the expected congestion duration; the average vehicle speed refers to the average speed of all vehicles on the road in front of the holographic guidance device; the number of pedestrians refers to the real-time number of pedestrians at the traffic hub corresponding to the pedestrian warning information.

[0085] The control decision unit also includes a projection strategy subunit; the projection strategy subunit is used to adjust the projection time proportion of each type of traffic guidance information in the projection cycle;

[0086] The projection strategy subunit is configured with a first adjustment strategy, specifically including: obtaining the congestion data and the average vehicle speed; the projection strategy subunit is also configured with a high threshold of congestion length and a high threshold of congestion time; if the total length of the congested road section is greater than the high threshold of congestion length, or the estimated congestion time is greater than the high threshold of congestion time, then increasing the projection time proportion of the road congestion information and driving guidance information;

[0087] The projection strategy subunit is also configured with a low threshold for congestion length, a low threshold for congestion time and a vehicle speed threshold; if the total length of the congested road section is less than the low threshold for congestion length, and the expected congestion duration is less than the low threshold for congestion time, and the average vehicle speed is greater than the vehicle speed threshold, then the projection time proportion of the traffic rules information and weather-related information is increased.

[0088] The total projection time proportion of each type of traffic guidance information is 1. When the projection time proportion of at least one type of traffic guidance information increases, the projection time proportion of the remaining traffic guidance information decreases proportionally to ensure that the total projection time proportion is 1. When the total length of the congested section is greater than the high threshold of the congestion length, or the expected congestion duration is greater than the high threshold of the congestion time, it means that the road ahead is seriously congested, and it is necessary to focus on displaying key information such as the location of the congested section and the severity of the congestion, so as to help the driver plan a detour route or adjust travel arrangements in time. At the same time, in order to guide the driver to detour in advance, the driving guidance information is displayed emphatically to help the driver get rid of the congestion as soon as possible and improve travel efficiency. For example, the projection time proportion of road congestion information is greatly increased from 0.2 to 0.5, the projection time proportion of driving guidance information is increased from 0.2 to 0.3, and the projection time proportion of the other three types of information is reduced proportionally. When the total length of the congested road section is less than the lower threshold of the congestion length, and the estimated congestion duration is less than the lower threshold of the congestion time, and the average vehicle speed is greater than the vehicle speed threshold, the traffic condition is good at this time, but the vehicle speed is fast, and it is necessary to emphasize traffic rules such as speed limit and keeping distance to ensure driving safety. At the same time, if there is weather-related information, faster vehicle speeds are more likely to cause accidents under the influence of bad weather. Therefore, it is necessary to increase the projection time proportion of traffic rule information and weather-related information.

[0089] The projection strategy subunit is also configured with a second adjustment strategy, which specifically includes:

[0090] Based on the query subunit, historical pedestrian data is obtained from the cloud server; the historical pedestrian data is statistically analyzed to identify the peak time period and the valley time period of the number of pedestrians every day; the number of pedestrians is obtained; the projection strategy subunit is also configured with a high threshold of the number of people. If the current moment is in the peak time period and the number of pedestrians is greater than the high threshold of the number of people, the projection time proportion of the pedestrian warning information is increased. When the number of pedestrians at the traffic hub ahead is in the peak time period of the day, the driver needs to be reminded to pay attention to giving way to pedestrians.

[0091] The second perception subunit is configured with a minimum light intensity threshold of the ambient light intensity; if the ambient light intensity is lower than the minimum light intensity threshold, the second perception subunit sends a low-light notification to the projection strategy subunit; the projection strategy subunit is also configured with a third adjustment strategy, and when the low-light notification is received, the third adjustment strategy is triggered, as follows: if the current moment is not in the low-light period, the projection time ratio of the pedestrian warning information is increased. In a low-light environment, the visibility of pedestrians is reduced, and the risk of collision between vehicles and pedestrians increases. Therefore, the projection time ratio of pedestrian warning information such as crosswalk warnings and pedestrian-dense area warnings is increased. In addition, in the display mode of holographic projection, a high-contrast display mode is adopted, such as displaying pedestrian-related text information in white bold font, and the background is dark with a flashing effect to enhance visibility in a low-light environment.

[0092] Example 2

[0093] This embodiment is the second embodiment of the present application; based on the same inventive concept as that of the first embodiment, this embodiment introduces a holographic guidance system, including a data acquisition module, a cloud server, and a holographic guidance device on a traffic sign as described in the first embodiment. Wherein:

[0094] The data collection module is used to collect traffic flow, average vehicle speed, number of pedestrians, and upload them to the cloud server;

[0095] The cloud server calculates the total length of the congested road section and the estimated congestion duration based on the traffic volume and average vehicle speed; the cloud server also stores traffic guidance information;

[0096] The holographic guidance device obtains traffic guidance information from the cloud server and performs holographic projection on the traffic guidance information; the holographic guidance device is also used to obtain the total length of the congested road section, the expected congestion duration, the average vehicle speed, the number of pedestrians from the cloud server, and adjust the projection time proportion of each type of traffic guidance information.

[0097] The cloud server also stores historical pedestrian data, and the holographic guidance device can also adjust the projection time ratio of traffic guidance information based on historical pedestrian data and the real-time number of pedestrians and ambient light intensity. The cloud server stores detailed electronic maps for providing traffic rules information, driving guidance information, and pedestrian warning information; the cloud server is also used to obtain weather data and provide weather-related information. In addition, the cloud server also determines the congestion level of each congested section based on the average speed of each congested section. For example, the first and second thresholds of the congestion speed are set, and the road ahead is segmented; if the average speed of any section is lower than the first threshold, it is severely congested; if the average speed of any section is lower than the second threshold and not lower than the first threshold, it is slightly congested.

[0098] The specific functions of the above modules are realized by referring to the relevant contents of the holographic guidance device on the traffic sign frame described in Example 1, which will not be elaborated here.

[0099] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0100] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose and scope of protection of the present application, all of which are within the protection of the present application.

Claims

1. A holographic guidance device on a traffic sign, characterized in that: It includes a holographic projection unit, an environment perception unit, and a control decision unit; among which: The holographic projection unit holographically projects the traffic guidance information based on a set projection period; The environment sensing unit is used to collect the environment light intensity and the environment visibility; the control decision unit adjusts the projection brightness of the holographic projection based on the environment light intensity and the environment visibility; The environment perception unit is also used to obtain real-time traffic data; the control decision unit adjusts the projection time proportion of each type of traffic guidance information in the projection cycle based on the real-time traffic data.

2. The holographic guidance device on a traffic sign according to claim 1, characterized in that: The holographic projection unit includes a projection subunit and an image production subunit; The projection subunit is equipped with a holographic projector and a holographic projection film; the projection subunit is used to project the holographic projection image produced by the image production subunit to a designated position; The traffic guidance information includes traffic rules information, road congestion information, driving guidance information, pedestrian warning information, and weather-related information; The projection cycle is the time period for each type of traffic guidance information to complete a cycle of holographic projection; each type of traffic guidance information is provided with a corresponding projection time ratio; the projection time ratio is the ratio of the duration of holographic projection of the corresponding traffic guidance information in a projection cycle to the total duration of the projection cycle; in any projection cycle, the holographic projector projects each type of traffic guidance information in turn based on the projection time ratio of each type of traffic guidance information.

3. The holographic guidance device on a traffic sign as claimed in claim 2, characterized in that: The environment sensing unit includes a first sensing subunit and a second sensing subunit; The first sensing subunit includes a light intensity sensor for collecting ambient light intensity; the second sensing subunit includes a visibility sensor for collecting ambient visibility; The control decision unit includes a brightness control subunit; The brightness control subunit is used to adjust the projection brightness of the holographic projection, specifically including: S1: Determine the fusion weight of ambient light intensity and ambient visibility based on the current time tag; S2: Calculate the environmental disturbance factor based on the fusion weight of ambient light intensity and ambient visibility; S3: Adjusting the projection brightness of the holographic projection based on the environmental disturbance factor.

4. The holographic guidance device on a traffic sign as claimed in claim 3, characterized in that: The time label includes daytime and nighttime; the brightness control subunit determines the current time label based on the current time point; The brightness control subunit is configured with a weight setting strategy, which specifically includes: Let the fusion weight of ambient light intensity be w1, and the fusion weight of ambient visibility be w2, and the sum of w1 and w2 is always 1; If the current time tag is daytime, the fusion weight w1 of the ambient light intensity is w i0 , the fusion weight w2 of the environmental visibility is w v0 ; If the current time tag is nighttime, the fusion weight w1 of the ambient light intensity is w i1 , the fusion weight w2 of the environmental visibility is w v1 ; The second perception subunit is configured with a minimum visibility threshold; if the ambient visibility is lower than the minimum visibility threshold, the second perception subunit sends a low visibility notification to the brightness control subunit; the weight setting strategy also includes: if a low visibility notification is received, the fusion weight w1 of the ambient light intensity is set to w i2 , the fusion weight w2 of the environmental visibility is w v2 .

5. The holographic guidance device on a traffic sign according to claim 4, characterized in that: The calculation of the environmental disturbance factor based on the fusion weight of the ambient light intensity and the ambient visibility specifically includes: setting the maximum reference value of the ambient light intensity, denoted as I max ; Set the maximum reference value of environmental visibility, denoted as V max ; The environmental disturbance factor is based on the ambient light intensity and I max The ratio of ambient visibility to V max Calculate the ratio.

6. The holographic guidance device on a traffic sign as claimed in claim 5, characterized in that: The adjustment of the projection brightness of the holographic projection specifically includes: setting the initial projection brightness, denoted as L0; setting the maximum projection brightness, denoted as L max ; Set the maximum reference value of the environmental disturbance factor, denoted as F max ; Set the minimum reference value of the environmental disturbance factor, denoted as F min ; The brightness control subunit uses linear interpolation based on L0, L max 、F min 、F max And the environmental disturbance factor F adjusts the projection brightness of the holographic projection.

7. The holographic guidance device on a traffic sign according to claim 6, characterized in that: The environment perception unit further includes a query subunit; the query subunit is used to obtain real-time traffic data from the cloud server; the real-time traffic data includes congestion data, average vehicle speed, and number of pedestrians; wherein the congestion data includes the total length of the congested road section and the estimated congestion duration; The control decision unit also includes a projection strategy subunit; the projection strategy subunit is used to adjust the projection time proportion of each type of traffic guidance information in the projection cycle; The projection strategy subunit is configured with a first adjustment strategy, specifically including: obtaining the congestion data and the average vehicle speed; the projection strategy subunit is also configured with a high threshold of congestion length and a high threshold of congestion time; if the total length of the congested road section is greater than the high threshold of congestion length, or the estimated congestion time is greater than the high threshold of congestion time, then increasing the projection time proportion of the road congestion information and driving guidance information; The projection strategy subunit is also configured with a low threshold for congestion length, a low threshold for congestion time and a vehicle speed threshold; if the total length of the congested road section is less than the low threshold for congestion length, and the expected congestion duration is less than the low threshold for congestion time, and the average vehicle speed is greater than the vehicle speed threshold, then the projection time proportion of the traffic rules information and weather-related information is increased.

8. The holographic guidance device on a traffic sign according to claim 7, characterized in that: The projection strategy subunit is also configured with a second adjustment strategy, which specifically includes: Based on the query subunit, historical pedestrian data is obtained from the cloud server; statistical analysis is performed on the historical pedestrian data to identify the peak time periods and trough time periods of the number of pedestrians every day; the number of pedestrians is obtained; the projection strategy subunit is also configured with a high threshold for the number of people. If the current moment is in the peak time period and the number of pedestrians is greater than the high threshold for the number of people, the projection time proportion of the pedestrian warning information is increased.

9. The holographic guidance device on a traffic sign according to claim 8, characterized in that: The second perception sub-unit is configured with a minimum light intensity threshold of the ambient light intensity; if the ambient light intensity is lower than the minimum light intensity threshold, the second perception sub-unit sends a low-light notification to the projection strategy sub-unit; the projection strategy sub-unit is also configured with a third adjustment strategy, and when the low-light notification is received, the third adjustment strategy is triggered, as follows: if the current moment is not in the low time period, the projection time proportion of the pedestrian warning information is increased.

10. A holographic guidance system, characterized in that: The invention comprises a data acquisition module, a cloud server, and a holographic guidance device on a traffic sign according to any one of claims 1 to 9, wherein: The data collection module is used to collect traffic flow, average vehicle speed, number of pedestrians, and upload them to the cloud server; The cloud server calculates the total length of the congested road section and the estimated congestion duration based on the traffic volume and average vehicle speed; the cloud server also stores traffic guidance information; The holographic guidance device obtains traffic guidance information from the cloud server and performs holographic projection on the traffic guidance information; the holographic guidance device is also used to obtain the total length of the congested road section, the expected congestion duration, the average vehicle speed, the number of pedestrians from the cloud server, and adjust the projection time proportion of each type of traffic guidance information.

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