CN114550539A - Method for recording training track animation trace of learner-driven vehicle in driving school - Google Patents
Method for recording training track animation trace of learner-driven vehicle in driving school Download PDFInfo
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Abstract
The invention provides a driving school learner-driven vehicle practice track animation trace recording method, which comprises the steps of judging whether a track recording condition is triggered or not when a new frame of satellite data is acquired, drawing a vehicle outline on an original base map corresponding to a current practice project, carrying out coordinate conversion on the current satellite data and the previous frame of satellite data and drawing a line on the original base map when the next frame of satellite data arrives, sequentially drawing position traces of each frame of satellite data until the track recording condition is triggered to be ended, generating an SVG (scalable vector graphics) graphic file by using the original base map and the data obtained in the above time period, and obtaining an animation file map from a stroke starting recording track to a track ending recording time period. The invention records the vehicle practice process of the key position section in the practice of the learner-driven vehicle in the form of animation, is convenient for a student to recognize and understand various problems in the driving process, and is also convenient for a coach in a driving school to carry out repeated teaching, so that the teaching is more visual and vivid.
Description
Technical Field
The invention belongs to the technical field of driving school training, and particularly relates to a method for recording an animation trace of a training track of a driving school learner-driven vehicle.
Background
Driving schools are used for training students to master certain driving skills, and therefore safety of road driving is guaranteed. In the training of driving schools, most of the existing modes are that coaches and students in driving schools carry out face-to-face teaching, the trainees demonstrate various types of operations for the trainees, and the trainees then carry out simulated learning.
However, the following technical problems exist in the practical teaching: firstly, a coach needs to aim at all students, but some students have low acceptance degree, slow learning and need to demonstrate for many times, so that the teaching efficiency is low; secondly, in the process of simulating learning, the learner cannot clearly recognize the actual driving route of the vehicle and accurately recognize and understand errors in the driving process of the learner due to the fact that the learner is in the vehicle. Therefore, how to automatically record the motion trail of the learner-driven vehicle to assist a student or a trainer in teaching and learning is especially important for improving the learning efficiency.
Disclosure of Invention
In order to solve the technical problem, the invention provides a method for recording the training track animation trace of the learner-driven vehicle in a driving school. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
The invention adopts the following technical scheme:
in some optional embodiments, there is provided a driving school instructional car exercise trajectory animation trace recording method, including: acquiring northeast coordinates of the vehicle at each time point; and converting the northeast coordinates of the vehicle obtained at the current time point and the northeast coordinates of the vehicle obtained at the previous time point into SVG coordinates, and connecting the SVG coordinates corresponding to the two time points on the original base map by using straight lines to form a stage vehicle track.
Further, the method previously comprises: reading the mapped map file in the practice field and generating an original base map of each practice project; the map file comprises northeast coordinate data corresponding to position area boundary lines defined by all the exercise items; the original base map refers to a block diagram of an SVG format corresponding to each exercise item, and coordinates in the original base map are converted into SVG coordinates of northeast coordinates obtained through surveying and mapping.
Further, the exercise items include: backing and warehousing, side parking, curve driving, right-angle turning and hill starting.
Further, the northeast coordinates of the vehicle refer to coordinates of outer center points of two rear wheels of the vehicle vertically projected to a horizontal plane.
Further, the method further comprises: judging whether a track recording condition is triggered or not, and if the judgment result is the trigger track recording condition, starting to record the northeast coordinates of the vehicle; the trigger track recording condition refers to that a vehicle moving mode violation is detected or that the vehicle starts a current exercise item is detected.
Further, the method further comprises: and judging whether the vehicle contour is recorded or not, and if the judgment result is that the vehicle contour is not recorded, drawing the vehicle contour at the initial position of the original base map.
Further, the process of drawing the vehicle outline includes: positioning through two satellite antennas arranged on the vehicle to determine the position and the direction of the vehicle; mapping to obtain northeast coordinates of 32 contour points of the vehicle based on the two satellite antennas; and converting the northeast coordinates of the 32 contour points into SVG coordinates, and drawing the SVG coordinates of each point on the generated original base map in a line drawing manner.
Further, the method further comprises: and when the track recording condition is triggered to be finished, judging whether a target animation picture needs to be generated or not, if so, generating the stage vehicle track data obtained in the recording time period into a graphic file in an SVG (scalable vector graphics) format, and obtaining an animation file picture in the recording time period.
Further, the triggering of the ending track recording condition refers to the detection of the vehicle ending the current exercise item.
The invention has the following beneficial effects: the invention records the vehicle practice process of the key position section in the practice of the learner-driven vehicle in the form of animation, is convenient for a student to recognize and understand various problems in the driving process, and is also convenient for a coach in a driving school to carry out repeated teaching, so that the teaching is more visual and vivid.
Drawings
FIG. 1 is a schematic flow chart of a method for recording an animation trace of an exercise track of a learner-driven vehicle in a driving school according to the present invention;
FIG. 2 is a schematic view of an animation file map of a reverse garage exercise project of the present invention at a point in time;
FIG. 3 is a schematic diagram of an original base map corresponding to a reverse garage exercise project according to the present invention;
FIG. 4 is a schematic view of an animation file map of a side parking exercise program at a point in time in accordance with the present invention;
FIG. 5 is a schematic view of an original base map corresponding to the side parking exercise project of the present invention.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others.
1-5, in some illustrative embodiments, the present invention provides a driving school instruction car exercise trajectory animation trace recording method, comprising the steps of:
101: the mapped map file in the practice field is read and the original base map of each exercise project is generated.
The map file is in a self-defined format, particularly a thenu suffix file, the map file comprises northeast coordinate data corresponding to position area boundary lines defined by all exercise items, and the data arrangement format and the packet head and the packet tail are self-defined. In the driving school training process, when a certain training project needs to be carried out, a student is generally specified to drive a vehicle in a specified position area according to a specified direction and steps, the position area for carrying out the training is defined by a boundary line, and the boundary line is formed by connecting a plurality of line segments, so that northeast coordinate data of the boundary line of the position area in a training field map can be obtained by mapping in advance.
The map file obtained by mapping can be obtained by adopting the existing map mapping mode, and the description is omitted.
The northeast coordinate is obtained based on a northeast coordinate system, the northeast coordinate system is a coordinate system formed by three coordinate axes in an east direction, a north direction and a vertical direction perpendicular to a horizontal plane, and the origin of coordinates is the antenna position of a reference station in the real-time differential positioning technology.
The original base map in step 101 is a block diagram of an SVG format corresponding to each exercise item, and coordinates in the original base map are mapped to SVG coordinates converted from northeast coordinates.
After northeast coordinates of the boundary line of the position area of each exercise item are obtained through mapping, the northeast coordinates are converted into SVG coordinates and are connected in sequence, and a block diagram in an SVG format can be obtained, wherein a frame line segment in the block diagram corresponds to the boundary line of the position area which is defined in advance, and the frame line segment is shown in fig. 3 and 5.
The exercise items of the present invention include: backing and warehousing, side parking, curve driving, right-angle turning and hill starting. Each practice site can have a plurality of repeated practice items, such as 5 warehouse-in, 3 side parking, 4 curve driving, 6 quarter turns, 2 hill starts.
102: the satellite data is read. Satellite data refers to the geographical position data of the vehicle positioned by the satellite receiver, and the satellite data is acquired and analyzed by the satellite receiver and is sent to the CPU through a serial port; the satellite receiver receives data of three satellite positioning systems of Beidou, GPS and Greenan.
103: and judging whether satellite data is acquired, if so, performing the step 104, and otherwise, ending the process. The design of step 103 can avoid repeatedly reading the position data, which causes the flow to be executed unsmoothly or not smoothly.
104: and reading the position data of the vehicle, namely reading the position data of the vehicle in the acquired satellite data.
105: and judging whether the track recording condition is triggered or not, if so, performing the step 106, otherwise, returning to the step 102.
The trigger track recording condition can be configured according to the requirements of the user, generally means that the vehicle movement mode violation is detected or the vehicle is detected to start the current exercise item, and the judgment is carried out according to the position data of the vehicle during the detection. For example, when the vehicle detects that the vehicle has a point deduction item, i.e. an illegal moving mode, such as a fifth point of parking halfway, in the process of doing exercise items, the track recording condition is triggered. For example, when a vehicle enters a defined position area during a practice item of backing up and warehousing, a track recording condition is triggered to indicate that the vehicle starts to do the practice item and needs to record the track of the vehicle.
The determination process in step 105 enables recording of the position data to be started only when the track recording condition is triggered, so as to avoid recording redundant useless position data, thereby causing system data redundancy and affecting the speed of process execution.
106: the northeast coordinates of the vehicle begin to be recorded.
107: and judging whether the vehicle contour is recorded or not, if so, performing step 109, and if not, performing step 108.
108: the vehicle contour is drawn at the start position of the original base map. The starting position of the original base map refers to a position on the original base map after the position coordinates of the recorded vehicle are reconverted into SVG coordinates when the track recording condition is triggered.
Wherein the vehicle contour is obtained by mapping, and in step 108, the process of drawing the vehicle contour includes:
firstly, positioning is carried out through two satellite antennas arranged on a vehicle to determine the position and the direction of the vehicle, wherein the two satellite antennas are a front antenna and a rear antenna;
then, surveying and mapping to obtain the northeast coordinates of the 32 contour points of the vehicle by taking the two satellite antennas as the reference, and obtaining the northeast coordinates of the whole vehicle body contour after determining the position coordinates of the rear antenna;
and finally, converting the northeast coordinates of the 32 contour points into SVG coordinates, and drawing the SVG coordinates of each point on the generated original base map in a line drawing manner to obtain the vehicle contour. The method for drawing the wire harness adopts a c + + library function to provide a method for drawing a line on an SVG (scalable vector graphics) picture, a starting point coordinate is designated, the line is drawn, parameters such as line thickness and color are set, the drawing mode is the prior art, and the description is omitted.
The drawing of the vehicle outline enables the final animation to be more visual and convenient for a student to understand.
109: and starting to record track data, namely, starting to acquire the northeast coordinates of the vehicle at each time point. The northeast coordinates of the vehicle are coordinates of the central points of the outer sides of the two rear wheels of the vehicle, which are vertically projected to a horizontal plane.
110: and converting the northeast coordinates of the vehicle obtained at the current time point and the northeast coordinates of the vehicle obtained at the previous time point into SVG coordinates and recording the SVG coordinates.
The coordinate conversion method includes: for example, the pixel width and height of the SVG original base map are defined as width and height, the upper left northeast coordinates are defined as (x _ left _ up, y _ left _ up), the lower right northeast coordinates are defined as (x _ right _ bottom, y _ right _ bottom), the real-time northeast coordinates of the vehicle are defined as (x0, y0), and the converted northeast coordinates are defined as (x, y):
x＝(x0-x_left_up)×width/(x_right_bottom-x_left_up)；
y＝(y0-y_left_up)×width/(y_right_bottom-y_left_up)。
111: and when the track recording ending condition is triggered, judging whether a target animation picture needs to be generated or not, if so, executing the step 112, otherwise, returning to the step 102.
The condition for triggering the ending of the track recording refers to that the vehicle is detected to end the current exercise item, for example, when the vehicle is detected to enter a garage area defined by a defined position area when the vehicle is subjected to a back garage exercise item, the condition for triggering the ending of the track recording indicates that the vehicle has ended the exercise item, and the track of the vehicle does not need to be recorded any more.
112: and generating an animation file graph. When an animation file graph needs to be generated, SVG coordinates corresponding to two adjacent time points are connected by straight lines on an original base graph to form a stage vehicle track, and all the stage vehicle track data can be obtained after all the SVG coordinates obtained in a recording time period are connected.
And generating the vehicle track data in the stage obtained in the recording time period into a graphic file in an SVG format, namely obtaining an animation file image in the recording time period, wherein the animation file image is an animation, and the animation shows the running track of the vehicle in the recording time period, namely shows the process that the vehicle image with the outline moves in a block diagram corresponding to a certain exercise item.
Wherein, the time from triggering the track recording condition to triggering the track recording condition is the recording time interval.
Drawing animation by using SVG (scalable vector graphics) is prior art and is not described in detail herein.
When a new frame of satellite data is acquired, whether a track recording condition is triggered or not is judged, a vehicle outline is drawn on an original base map corresponding to a current exercise item, at the moment, when the next frame of satellite data arrives, coordinate conversion is carried out on the current satellite data and the previous frame of satellite data, lines are drawn on the original base map, traces of the position of each frame of satellite data are drawn in sequence until the track recording condition is triggered to be finished, the original base map and the data are obtained at the moment, an SVG graphic file is generated, and an animation file map from the time of starting the track recording to the time of finishing the track recording of the stroke can be obtained. The method meets the requirement of small animation production of local map vehicle tracks at key position time intervals, can be understood as the right turning process of a certain intersection by the conventional navigation technology, intercepts the map of the intersection, and forms the position data of the right turning process and the intercepted small blocks of images into an animation so as to meet the requirement of key node recording and playback in the actual driving practice process, and has simple flow and easy realization.
Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
Claims (9)
1. A method for recording an animation trace of an exercise track of a learner-driven vehicle in a driving school is characterized by comprising the following steps:
acquiring northeast coordinates of the vehicle at each time point;
and converting the northeast coordinates of the vehicle obtained at the current time point and the northeast coordinates of the vehicle obtained at the previous time point into SVG coordinates, and connecting the SVG coordinates corresponding to the two time points on the original base map by using straight lines to form a stage vehicle track.
2. The method as claimed in claim 1, wherein the method comprises the following steps: reading the mapped map file in the practice field and generating an original base map of each practice project;
the map file comprises northeast coordinate data corresponding to position area boundary lines defined by all the exercise items;
the original base map refers to a block diagram of an SVG format corresponding to each exercise item, and coordinates in the original base map are converted into SVG coordinates of northeast coordinates obtained through surveying and mapping.
3. The driving school instructional car exercise trajectory animation trace recording method according to claim 2, wherein the exercise items comprise: backing and warehousing, side parking, curve driving, right-angle turning and hill starting.
4. The method as claimed in claim 3, wherein the northeast coordinates of the vehicle are coordinates of the center points of the outer sides of the two rear wheels of the vehicle projected vertically to a horizontal plane.
5. The method as claimed in claim 4, further comprising: judging whether a track recording condition is triggered or not, and if the judgment result is the trigger track recording condition, starting to record the northeast coordinates of the vehicle;
the trigger track recording condition refers to that a vehicle moving mode violation is detected or that the vehicle starts a current exercise item is detected.
6. The method as claimed in claim 5, further comprising: and judging whether the vehicle contour is recorded or not, and if the judgment result is that the vehicle contour is not recorded, drawing the vehicle contour at the initial position of the original base map.
7. The method as claimed in claim 6, wherein the step of outlining the vehicle comprises:
positioning through two satellite antennas arranged on the vehicle to determine the position and the direction of the vehicle;
mapping to obtain northeast coordinates of 32 contour points of the vehicle based on the two satellite antennas;
and converting the northeast coordinates of the 32 contour points into SVG coordinates, and drawing the SVG coordinates of each point on the generated original base map in a line drawing manner.
8. The method as claimed in claim 7, further comprising: and when the track recording condition is triggered to be finished, judging whether a target animation picture needs to be generated or not, if so, generating the stage vehicle track data obtained in the recording time period into a graphic file in an SVG (scalable vector graphics) format, and obtaining an animation file picture in the recording time period.
9. The method as claimed in claim 8, wherein the condition for recording the end trajectory is detected when the vehicle ends the current exercise item.
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