CN110807936A - Statistical system for identifying vehicle model and measuring and calculating speed - Google Patents

Abstract

The invention discloses a statistical system for recognizing vehicle model and measuring speed, and relates to the technical field of vehicle information collection. The invention includes a microprocessor, a camera and a laser range finder; the microprocessor and the camera perform data transmission; the laser range finder includes a laser range finder A and a laser range finder B; the laser range finder outputs the distance to the microprocessor At the same time, the time when the microprocessor records the distance data; both laser range finder A and laser range finder B are set on the same side of the lane; according to laser range finder A and laser range finder B, the distance detection starts Change the time difference, calculate the speed of the vehicle at this time, and analyze and filter out the matching vehicle model; then the microprocessor performs classification statistics. Through the functions of the microprocessor, the camera and the laser range finder, the invention realizes further verification of the vehicle model judged by the identification module, and has the advantages of extremely high accuracy and simultaneous collection of the driving speed.

Description

A Statistical System for Identifying Vehicle Models and Measuring Speed

technical field

The invention belongs to the technical field, and in particular relates to a statistical system for identifying vehicle models and measuring speed.

Background technique

With the continuous development of science and technology, people's travel has become more and more convenient, and various vehicles such as cars and trucks are driving on the lane. When we need to collect information such as the model, size, and quantity of vehicles on a certain road, manual statistics are cumbersome, time-consuming, and the sample size is small. When the difference in appearance is small, the collected data may have large errors or cannot be discriminated, and when the lighting is poor, the accuracy of image acquisition and judgment is greatly reduced.

By identifying and pairing the shape of the vehicle, the invention finds out the image features of the shape of the vehicle in the database for pairing, and at the same time, it also matches the outer diameter of the front tire, the outer diameter of the rear tire, the wheelbase, the length of the whole vehicle, etc. The data is collected, and then analyzed and judged; the vehicle model judged by the identification module can be further verified, which has the advantages of extremely high accuracy and simultaneous collection of driving speed.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a statistical system for recognizing the vehicle model and measuring the speed, through the functions of the microprocessor, the camera and the laser range finder, to further verify the vehicle model judged by the identification module, with extremely high performance. It has the advantages of high accuracy and simultaneous collection of driving speed, which solves the problem of low accuracy in judging the model.

In order to solve the above-mentioned technical problems, the present invention is achieved through the following technical solutions:

The present invention is a statistical system for recognizing vehicle model and measuring speed, comprising a microprocessor, a camera and a laser range finder;

The microprocessor and the camera perform data transmission through a communication module; the laser range finder includes a laser range finder A and a laser range finder B; the laser range finder outputs distance data information to the microprocessor, and at the same time The moment when the microprocessor records the distance data;

The camera outputs the video information of the vehicle to the microprocessor; the microprocessor is connected with an identification module; the identification module exchanges information with the database through the communication module; the microprocessor outputs the video information of the vehicle to the identification module; The identification module extracts the identification features in the video information of the vehicle, and matches the data information in the database to obtain the vehicle model; the identification features include the license plate number, the identification of the vehicle brand, and the external shape of the vehicle. feature part;

The laser rangefinder A and the laser rangefinder B are both arranged on the same side of the lane, and are separated by 1m-100m; the height of the object measured by the laser rangefinder A and the laser rangefinder B is 5cm-50cm;

According to the time difference between the detection distance of the laser distance meter A and the laser distance meter B, the speed of the vehicle at this time is calculated, and the matching vehicle model is analyzed and screened; The models are checked to determine the model with the highest similarity.

Further, the height of the object measured by the laser rangefinder A and the laser rangefinder B is 10cm; the height is generally lower than the height of the vehicle chassis, that is, when the vehicle tires pass by, the distance detected by the laser rangefinder changes. , the microprocessor records the moment at this time.

Further, the measurement points of the laser range finder A and the laser range finder B are respectively the measurement point A and the measurement point B; Output: the time when the front tires reach the measurement point A, the time when the front tires all leave the measurement point A, the time when the rear tires reach the measurement point A, and the time when all the rear tires leave the measurement point A; the microprocessor changes according to the distance of the laser rangefinder B According to the time data information recorded at the time, it is calculated: the time when the front tires reach the measurement point B, the time when all the front tires leave the measurement point B, the time when the rear tires reach the measurement point B, and the time when all the rear tires leave the measurement point B.

Further, the time data recorded by the microprocessor can be calculated as follows: the passing time T1 of the front tire, the passing time T2 of the rear tire, the arrival time difference T3 of the front wheel and the rear wheel, and the departure time difference of the front wheel and the rear wheel. T4, the length of time between the departure of the front wheel and the arrival of the rear wheel T5; according to the speed of the vehicle at this time, the outer diameter of the front tire, the outer diameter of the rear tire, and the wheelbase of the vehicle can be obtained.

Further, the laser range finder further includes a laser range finder C; a laser range finder C is fixed between the laser range finder A and the laser range finder B; the laser range finder C is a microprocessing The data information of the distance is output by the sensor, and the time when the microprocessor records the distance data; the height of the object measured by the laser rangefinder C is 20cm-200cm; the laser rangefinder C is fixed on the one-way lane where the small vehicle passes. The height of the object measured by the laser rangefinder C is 20cm-80cm; when the laser rangefinder C is fixed on the one-way lane where the medium-sized vehicle passes, the height of the object measured by the laser rangefinder C is 40cm-120cm ; When the laser range finder C is fixed on a one-way lane through which large vehicles pass, the height of the object measured by the laser range finder C is 80cm-200cm; the measurement point of the laser range finder C is the measurement point C; the The microprocessor calculates according to the time data information recorded when the distance of the laser rangefinder B changes: the time difference T6 when the head of the vehicle arrives at the measurement point C and the rear of the vehicle leaves; Vehicle length.

Further, the microprocessor obtains the average value of the outer diameter of the tire according to the outer diameter of the front tire and the outer diameter of the rear tire, and the data information of the wheelbase size and the length of the whole vehicle is matched with the database, and the analysis and screening are carried out to meet the requirements. vehicle model.

The present invention has the following beneficial effects:

The invention uses the functions of microprocessor, camera and laser rangefinder to identify and pair the shape of the vehicle, find out the image features of the shape of the vehicle in the database and pair it, and at the same time, the outer diameter of the front tire of the vehicle, the size of the rear and the rear of the vehicle are also matched. Data such as tire outer diameter size, wheelbase size, and vehicle length are collected, and then analyzed and judged; further verification of the vehicle model judged by the identification module is realized, which has the advantages of extremely high accuracy and simultaneous collection of driving speed.

Of course, it is not necessary for any product embodying the present invention to achieve all of the above-described advantages simultaneously.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a block diagram of a statistical system for identifying vehicle models and measuring speed according to the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to Figure 1, the present invention is a statistical system for identifying vehicle models and measuring speed, including a microprocessor, a camera and a laser rangefinder;

The microprocessor and the camera transmit data through the communication module; the laser range finder includes a laser range finder A and a laser range finder B; the laser range finder outputs the data information of the distance to the microprocessor, and the microprocessor records the distance at the same time the moment when the data is present;

The camera outputs the video information of the vehicle to the microprocessor; the microprocessor is connected with the identification module; the identification module exchanges information with the database through the communication module; the microprocessor outputs the video information of the vehicle to the identification module; The identification features of the vehicle are extracted and matched with the data information in the database to obtain the vehicle model; the identification features include the license plate number, the identification of the vehicle brand, and the characteristic part of the external shape of the vehicle;

Both the laser rangefinder A and the laser rangefinder B are set on the same side of the lane, and the distance is 1m-100m; the height of the object measured by the laser rangefinder A and the laser rangefinder B is 5cm-50cm;

According to the time difference between the detection distance of the laser rangefinder A and the laser rangefinder B, the speed of the vehicle at this time is calculated, and the matching vehicle model is analyzed and filtered; then the microprocessor performs classification statistics, and compares it with the identified vehicle model. Check and determine the model with the highest similarity.

Preferably, the height of the object measured by the laser range finder A and the laser range finder B is 10cm; the height is generally lower than the height of the vehicle chassis, that is, when the vehicle tires pass by, the distance detected by the laser range finder changes, which is slightly lower than that of the vehicle. The processor records the moment at this time.

Preferably, the measurement points of the laser rangefinder A and the laser rangefinder B are the measurement point A and the measurement point B respectively; the microprocessor records the front tire according to the time data information recorded when the distance of the laser rangefinder A changes: The time when it reaches the measurement point A, the time when all the front tires leave the measurement point A, the time when the rear tires reach the measurement point A, and the time when all the rear tires leave the measurement point A; the time data information recorded by the microprocessor according to the distance change of the laser rangefinder B , and calculate: the time when the front tires reach the measurement point B, the time when all the front tires leave the measurement point B, the time when the rear tires reach the measurement point B, and the time when all the rear tires leave the measurement point B.

Preferably, the time data recorded by the microprocessor can be calculated as follows: the passing time T1 of the front tire, the passing time T2 of the rear tire, the arrival time difference T3 of the front wheel and the rear wheel, the departure time difference T4 of the front wheel and the rear wheel, The length of time T5 between the departure of the front wheels and the arrival of the rear wheels; according to the speed of the vehicle at this time, the outer diameter of the front tire, the outer diameter of the rear tire, and the wheelbase of the vehicle can be obtained.

Preferably, the laser range finder further includes a laser range finder C; a laser range finder C is fixed between the laser range finder A and the laser range finder B; the laser range finder C outputs distance data information to the microprocessor At the same time, the microprocessor records the time when the distance data is recorded; the height of the object measured by the laser range finder C is 20cm-200cm; when the laser range finder C is fixed on the one-way lane where the small vehicle passes, the object measured by the laser range finder C is 20cm-200cm. The height is 20cm-80cm; when the laser rangefinder C is fixed on the one-way lane where the medium-sized vehicle passes, the height of the object measured by the laser rangefinder C is 40cm-120cm; when the laser rangefinder C is fixed on the one-way lane where the large vehicle passes, the The height of the object measured by the laser range finder C is 80cm-200cm; the measurement point of the laser range finder C is the measurement point C; the microprocessor calculates according to the time data information recorded when the distance of the laser range finder B changes: The time difference T6 between the time when the front part arrives at the measuring point C and the rear part of the vehicle leaves; the entire vehicle length of the vehicle can be obtained according to the speed of the vehicle at this time.

Preferably, the microprocessor obtains the average value of the outer diameter of the tire according to the outer diameter of the front tire and the outer diameter of the rear tire, and the data information of the wheelbase size and the length of the whole vehicle is matched with the database, and the matching vehicle is analyzed and filtered out. model.

In the description of this specification, description with reference to the terms "one embodiment," "example," "specific example," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one aspect of the present invention. in one embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above-disclosed preferred embodiments of the present invention are provided only to help illustrate the present invention. The preferred embodiments do not exhaust all the details, nor do they limit the invention to only the described embodiments. Obviously, many modifications and variations are possible in light of the content of this specification. The present specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is to be limited only by the claims and their full scope and equivalents.

Claims (6)

1. a statistical system for identifying vehicle model and measuring and calculating speed, is characterized in that: comprise microprocessor, camera and laser rangefinder; The microprocessor and the camera perform data transmission through a communication module; the laser range finder includes a laser range finder A and a laser range finder B; the laser range finder outputs distance data information to the microprocessor, and at the same time The moment when the microprocessor records the distance data; The camera outputs the video information of the vehicle to the microprocessor; the microprocessor is connected with an identification module; the identification module exchanges information with the database through the communication module; the microprocessor outputs the video information of the vehicle to the identification module; The identification module extracts the identification features in the video information of the vehicle, and matches the data information in the database to obtain the vehicle model; the identification features include the license plate number, the identification of the vehicle brand, and the external shape of the vehicle. feature part; The laser rangefinder A and the laser rangefinder B are both arranged on the same side of the lane, and are separated by 1m-100m; the height of the object measured by the laser rangefinder A and the laser rangefinder B is 5cm-50cm; According to the time difference between the detection distance of the laser distance meter A and the laser distance meter B, the speed of the vehicle at this time is calculated, and the matching vehicle model is analyzed and screened; The models are checked to determine the model with the highest similarity. 2. A kind of statistical system for identifying vehicle model and measuring and calculating speed according to claim 1, is characterized in that, the height of the object measured by described laser distance meter A and laser distance meter B is 10cm; All are lower than the height of the vehicle chassis, that is, when the vehicle tires pass by, the distance change detected by the laser rangefinder will be detected, and the microprocessor will record the moment at this time. 3. a kind of statistical system for identifying vehicle model and measuring and calculating speed according to claim 2, is characterized in that, described laser distance meter A and laser distance meter B measurement point are respectively measurement point A and measurement point B; the microprocessor records according to the time data information recorded when the distance of the laser distance meter A changes: the time when the front tires reach the measurement point A, the time when all the front tires leave the measurement point A, and the time when the rear tires reach the measurement point A , the time when all the rear tires leave the measurement point A; The microprocessor calculates according to the time data information recorded when the distance of the laser rangefinder B changes: the time when the front tires reach the measurement point B, the time when all the front tires leave the measurement point B, the time when the rear tires reach the measurement point B, and the time when the rear tires reach the measurement point B. When all tires leave measurement point B. 4. a kind of statistical system for identifying vehicle model and measuring and calculating speed according to claim 3, is characterized in that, the moment data recorded by described microprocessor can be calculated: front tire passes time T1, rear tire The elapsed time T2, the arrival time difference between the front wheel and the rear wheel T3, the departure time difference between the front wheel and the rear wheel T4, the time between the front wheel leaving and the rear wheel arriving T5; Tire outer diameter, rear tire outer diameter, wheelbase size. 5. A statistical system for identifying vehicle model and measuring speed according to claim 4, wherein the laser range finder further comprises a laser range finder C; the laser range finder A and the laser A laser rangefinder C is fixed between the rangefinders B; the laser rangefinder C outputs the data information of the distance to the microprocessor, and the microprocessor records the time when the distance data is recorded; the laser rangefinder C The height of the measured object is 20cm-200cm; When the laser range finder C is fixed on the one-way lane where the small vehicle passes, the height of the object measured by the laser range finder C is 20cm-80cm; When the laser range finder C is fixed on the one-way lane where the medium-sized vehicle passes, the height of the object measured by the laser range finder C is 40cm-120cm; When the laser range finder C is fixed on a one-way lane where large vehicles pass, the height of the object measured by the laser range finder C is 80cm-200cm; The measurement point of the laser rangefinder C is the measurement point C; the microprocessor calculates according to the time data information recorded when the distance of the laser rangefinder B changes: the head of the vehicle reaches the measurement point C and the rear of the vehicle leaves. The time difference T6; according to the speed of the vehicle at this time, the entire vehicle length of the vehicle can be obtained. 6. A statistical system for identifying vehicle model and measuring speed according to claim 5, wherein the microprocessor obtains the outer diameter of the tire according to the outer diameter of the front tire and the outer diameter of the rear tire The average value of , as well as the data information of wheelbase size and vehicle length are matched with the database to analyze and filter out the matching vehicle models.

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