CN111784973B - MDVR equipment integration fatigue detection method of fleet management platform - Google Patents

MDVR equipment integration fatigue detection method of fleet management platform Download PDF

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CN111784973B
CN111784973B CN202010749726.0A CN202010749726A CN111784973B CN 111784973 B CN111784973 B CN 111784973B CN 202010749726 A CN202010749726 A CN 202010749726A CN 111784973 B CN111784973 B CN 111784973B
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王彦之
石锡敏
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Sharpvision Co ltd
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Abstract

The invention discloses an MDVR equipment integration fatigue detection method of a fleet management platform, when the real-time movement speed of a vehicle exceeds a movement speed threshold, eye opening detection is carried out, temporary eye closing accumulated time is counted according to the fact that the eye opening of two continuous frames of eyes is smaller than an eye opening threshold, and when the temporary eye closing accumulated time exceeds a certain threshold, the temporary eye closing accumulated time is counted, and continuous intermittent misjudgment caused by a bad optical environment is reduced; detecting that the cumulative eye opening time of the human eyes exceeds an eye opening time threshold, the human face recognition human face rotation angle and the shaking amplitude are too large, and clearing the cumulative eye closing time, wherein the cumulative eye opening time needs to be accumulated in a continuous time period, and otherwise, the cumulative eye opening time is cleared, so that the probability of clearing the cumulative eye closing time by mistake is extremely low; the target driver is judged to be in a fatigue state only when the eye closing accumulated time exceeds the eye closing accumulated time threshold, so that the number of wrong alarms is greatly reduced.

Description

MDVR equipment integration fatigue detection method of fleet management platform
Technical Field
The invention relates to the field of driving safety, in particular to a detection method for detecting driver fatigue by using MDVR (vehicle-mounted hard disk video recorder) equipment of a fleet management platform in driving.
Background
Traffic accidents have always been one of the most serious threats to the security of lives and properties faced by mankind, and most of them occur due to human factors of drivers. In the driving process of a vehicle, fatigue of a driver is one of important reasons for causing a malignant traffic accident, and the traffic safety is seriously damaged. The long-distance automobile driver has the phenomena of frequent beating, deep eyelid, inattention, vague nerves, light-headedness, slow response and the like when driving under a single road condition for a long time due to overlong continuous driving time.
In order to reduce the mental stress of drivers and prompt and early warn fatigue in time, the fatigue detection is carried out on the drivers, and meanwhile, the drivers are reminded, so that traffic accidents can be prevented and reduced to a great extent, and the traveling of citizens is safer. On the market, vehicle-mounted auxiliary equipment for fatigue driving detection mainly detects whether two eyes of a driver are closed or not by means of camera optics, so that whether the driver is in transition fatigue or not is detected. When the eyes of the driver are closed or the driver dozes off, the alarm reminds the driver of getting spirits and paying attention to danger. However, the device is used as a driving auxiliary device, and in order to remind a driver to avoid risks, the principle that more reports are preferred and the reports cannot be missed is adopted for the driving state judgment mode of the driver, so that a large amount of error alarm information can be generated.
Meanwhile, based on similar functions, in order to supervise the behavior of the driver, the fatigue state of the driver of the whole fleet is comprehensively analyzed and managed, the driver is prevented from driving the vehicle in the fatigue state, and the function can be loaded by the vehicle-mounted hard disk video recording equipment based on the Internet of vehicles. Through the camera, the fatigue state of inspection driver, under the tired condition of driver, video section is taken out, as the evidence, uploads to the high in the clouds, makes things convenient for motorcade management layer to know driver's fatigue state to implement the management. In such a working mode, if a strategy like "rather misreporting and unreported" is still adopted, a large amount of invalid videos may be uploaded, which brings great troubles to fleet management based on the function and related managers, and in fact, secondary screening of the uploaded videos is required manually. The excessive trouble and the ineffective video can lead to the management layer being careless, the long-term fright to the driver and the fatigue driving behavior is lacked, and finally the whole system is completely ineffective.
Disclosure of Invention
The invention provides a detection method for detecting driver fatigue by MDVR equipment of a fleet management platform, which judges the driving state of a driver on the basis of detecting the eye opening degree of human eyes through deep learning and reduces false alarm triggering of the fatigue state of the driver, so that the usability of related functions of the MDVR after being accessed to the fleet management platform is improved.
The invention relates to an MDVR equipment integration fatigue detection method of a fleet management platform, which comprises the following steps:
s1, presetting a motion speed threshold of the vehicle, obtaining the real-time motion speed of the vehicle through GPS positioning of the vehicle, and detecting the opening degree of human eyes after the real-time motion speed of the vehicle reaches the motion speed threshold;
s2, acquiring a face video of the target driver, carrying out eye opening detection on each frame of picture in a continuous section of video, and calculating an eye opening threshold value of human eyes;
s3, comparing the eye opening of each frame of picture with an open eye threshold, if the eye opening of two continuous frames of pictures is smaller than the open eye threshold, counting the time interval of the two frames of pictures into temporary closed eye accumulated time, and if the eye opening of the picture is larger than the open eye threshold, resetting the temporary closed eye accumulated time;
s4, if the temporary eye-closing accumulated time exceeds a certain threshold value, the temporary eye-closing accumulated time in the period of time is counted into the eye-closing accumulated time, and meanwhile, the temporary eye-closing accumulated time is cleared;
s5, if the change of the center position of the face is detected to be too large or the change of the rotation angle of the face is detected to be too large within a period of time, no time accumulation is carried out, and the eye closing accumulated time and the temporary eye closing accumulated time are cleared;
s6, presetting an eye opening time threshold, detecting the eye opening time of the human eyes in real time, calculating the eye opening accumulated time, clearing the eye opening accumulated time if the eyes are closed in the eye opening process, and clearing the eye closing accumulated time and the temporary eye closing accumulated time if the eye opening accumulated time exceeds the eye opening time threshold;
and S7, presetting an eye closing accumulated time threshold, and if the eye closing accumulated time is not cleared for a long time and is greater than the eye closing accumulated time threshold, judging that the target driver is in a fatigue state.
According to the MDVR equipment integration fatigue detection method of the fleet management platform, the eye opening degree is detected only when the real-time movement speed of the vehicle exceeds the movement speed threshold value, and the uploaded ineffective videos can be greatly reduced; the temporary eye closing accumulated time is counted according to the condition that the eye opening of the human eyes of two continuous frames is smaller than an open eye threshold value, and the eye closing accumulated time is counted only when the temporary eye closing accumulated time exceeds a certain threshold value, so that the continuous intermittent misjudgment accumulated eye closing accumulated time caused by a poor optical environment is reduced; if the situation that the accumulated eye-opening time of the human eyes exceeds the eye-opening time threshold value, the human face recognition human face rotation angle and the shaking amplitude are too large is detected, all time accumulation is stopped, and the eye-closing accumulated time is cleared, the eye-opening accumulated time needs to be cleared, the eye-closing situation cannot occur in a continuous time period, otherwise, the eye-opening accumulated time is cleared, and the possibility of mistakenly clearing the eye-closing accumulated time is extremely low; the target driver is judged to be in a fatigue state only when the eye closing accumulated time exceeds the eye closing accumulated time threshold; the accumulated eye closing time is accumulated once only when the accumulated temporary eye closing time exceeds a certain value (for example, one second), and if the eye opening is detected before the accumulated temporary eye closing time, the accumulated temporary eye closing time is cleared; therefore, the probability of false alarm is extremely low, the accuracy of the fatigue detection result is improved, the number of false alarms is greatly reduced, and the invalid video clips uploaded to the cloud server are reduced. The function of intercepting fatigue-related videos and uploading the videos to a management department does not need to inform a driver, and the function of connecting with a driving assistance-related function is also not needed, so that the missed report of fatigue events with a small probability to a certain extent can be accepted.
Drawings
Fig. 1 is a block diagram of steps of an MDVR device integrated fatigue detection method for a fleet management platform.
Detailed Description
As shown in fig. 1, a method for detecting integrated fatigue of MDVR devices of a fleet management platform includes the following steps:
s1, presetting a motion speed threshold of the vehicle, obtaining the real-time motion speed of the vehicle through GPS positioning of the vehicle, and detecting the opening degree of human eyes after the real-time motion speed of the vehicle reaches the motion speed threshold; if the speed target threshold value is not reached, or no GPS satellite signal exists, or the positioning accuracy is not enough, zero clearing is not carried out, and all time carried out before zero clearing is accumulated;
s2, acquiring a face video of the target driver, carrying out eye opening detection on each frame of picture in a continuous section of video, and calculating an eye opening threshold value of human eyes;
s3, comparing the eye opening of each frame of picture with an open eye threshold, if the eye opening of two continuous frames of pictures is smaller than the open eye threshold, counting the time interval of the two frames of pictures into temporary closed eye accumulated time, and if the eye opening of the picture is larger than the open eye threshold, resetting the temporary closed eye accumulated time;
s4, if the temporary eye-closing accumulated time exceeds a certain threshold value, the temporary eye-closing accumulated time in the period of time is counted into the eye-closing accumulated time, and meanwhile, the temporary eye-closing accumulated time is cleared;
s5, if the change of the center position of the face is detected to be too large or the change of the rotation angle of the face is detected to be too large within a period of time, no time accumulation is carried out, and the eye closing accumulated time and the temporary eye closing accumulated time are cleared;
s6, presetting an eye opening time threshold, detecting the eye opening time of the human eyes in real time, calculating the eye opening accumulated time, clearing the eye opening accumulated time if the eyes are closed in the eye opening process, and clearing the eye closing accumulated time and the temporary eye closing accumulated time if the eye opening accumulated time exceeds the eye opening time threshold;
and S7, presetting an eye closing accumulated time threshold, and if the eye closing accumulated time is not cleared for a long time and is greater than the eye closing accumulated time threshold, judging that the target driver is in a fatigue state.
The MDVR equipment integrated fatigue detection method of the fleet management platform can use vehicle-mounted MDVR equipment as terminal equipment of a vehicle networking fleet management system, is used for being installed on various operation vehicles and capturing and recording face related information of various images, and when the MDVR equipment detects that an abnormal event occurs, the MDVR equipment reports warning information to a server and uploads related videos as evidences. When the precision and the coordinates of the current positioning information fed back by the GPS and the real-time moving speed of the vehicle exist and are accurate, and when the vehicle moves to a certain speed, it is necessary to judge whether the target driver is tired to drive.
The degree of openness of human eyes can be obtained by a human eye characteristic point picking technology. Specifically, the human face feature point positioning based on the cascaded convolutional neural network can be used for acquiring the height and the length of the human eyes through the feature points, and the opening threshold value is equal to the eye height divided by the eye length, namely, the ratio of the height to the width is used as the opening of the human eyes.
In step S1, the eye opening detection is performed only when the real-time moving speed of the vehicle exceeds the moving speed threshold, and if the GPS signal is lost or the speed is less than the threshold (e.g., 5 km/h), the accumulation is not performed, and the original accumulated data is cleared. The phenomenon that the normal rest behavior of a driver is intercepted and uploaded by mistake can be greatly prevented when the vehicle is in a parking state. This feature can substantially reduce uploading of ineffective video.
In the steps S3 and S4, the temporary eye-closing accumulated time is counted according to the fact that the eye opening size of the eyes of two consecutive frames is smaller than the opening threshold, and the temporary eye-closing accumulated time is counted only when the temporary eye-closing accumulated time exceeds a certain threshold, if the eyes are opened halfway (that is, the opening size is larger than the threshold), the related temporary eye-closing time count is cleared, so that the continuous intermittent false judgment caused by the poor optical environment is greatly reduced.
The threshold for opening mentioned in step S3 may be preset, or may be dynamically adjusted according to the size of the driver' S eyes and the installation situation. The concrete mode is as follows:
if the driver does not actively move to a large extent within a period of time (the method is described in s 5), and the driving speeds of the cars fed back by the GPS are all higher than a certain threshold (for example, 5 km/h), and the detected value of the effective degree of openness exceeds a certain proportion (for example, 80%), the effective degree of openness is averaged and multiplied by a certain proportion (for example, 40%) to serve as the threshold of the degree of openness.
In order to exclude some abnormal detection results of the detection algorithm, we set the aspect ratio of the eye corresponding to the effective opening degree value, and must satisfy a certain condition (for example, the aspect ratio must be greater than 10%, below this threshold, it can be basically considered that the human eye is closed, and such a value cannot be added into the cumulative averaging).
If the preset open degree threshold value is not used, the subsequent calculation is carried out after the dynamic open degree threshold value is solved, otherwise, no threshold value is used for comparison.
The main objective of the features proposed in the steps S5 and S6 is to confirm that the driver is in a non-fatigue state with a high probability, and further reduce the triggering of false alarm of fatigue detection.
The step S5 requires that the face of the target driver must be in a stable state when performing the fatigue triggering. The large-amplitude movement and the large-amplitude rotation do not occur, and the loss can not occur. And if the face is not detected by the detection equipment, clearing the eye closing accumulated time.
In the concrete implementation, if the face of the driver is in the condition of large-amplitude movement and large-amplitude rotation, the driver is shown to actively act, and the visitor shows that the driver is not fatigued. On the other hand, if the driver moves in the picture, an error may occur in the detection of the size of the eyes due to motion blur.
More specifically, when the size of the target human eye is detected, the coordinates of the human face region are obtained at the same time, and the movement condition of the human face region is checked by taking the center of the region coordinates as the center. And checking the change condition of the human face size according to the size of the human face area. In practical use, the distance between two farthest central points in the whole time range of detection (for example, within one second) can be used as the movement displacement of the central points. The maximum face width and length in the whole time range can be used as the threshold. In other words, if the relative displacement of the center point is greater than the length of the largest face in the Y-axis direction, or greater than the length of the smallest face in the X-axis direction, the driver is considered to be actively moving greatly.
More specifically, we can also use an analysis method based on deep learning to calculate the angle of the face relative to the camera, and if the angle change is too large in a certain time range (for example, within one second), and exceeds a certain preset threshold, for example, 30 degrees, it is considered that the face is rotating violently, and it is considered that the driver is actively moving greatly.
According to the two condition analyses, if the driver is detected to actively move to a large extent, the detection of the face of the driver or the driver is considered to be in an unstable state.
In specific work, if a driver is in an unstable state, all original time counts related to eye closure are cleared. And we start the relevant detection only if the driver's face is stable for more than a period of time (say one second).
In step S6, the accumulation of the eye-open time requires that the eye-closing cannot occur in a continuous time period, and otherwise, the eye-open time is cleared, so that the possibility of erroneously clearing the eye-closing time is extremely low.
In the step S7, since the eye-closing accumulated time exceeds the eye-closing accumulated time threshold, it is determined that the target driver is in a fatigue state, and since the time accumulated value is very easy to be cleared in a non-fatigue state due to the multiple time clearing manners included in the steps S5 and S6, the probability of false alarm is very low, the accuracy of the fatigue detection result is improved, the number of false alarms is greatly reduced, and the number of invalid video clips uploaded to the cloud server is reduced.

Claims (4)

1. An MDVR equipment integration fatigue detection method of a fleet management platform is characterized by comprising the following steps:
s1, presetting a motion speed threshold of the vehicle, obtaining the real-time motion speed of the vehicle through GPS positioning of the vehicle, and detecting the opening degree of human eyes after the real-time motion speed of the vehicle reaches the motion speed threshold;
s2, acquiring a face video of the target driver, carrying out eye opening detection on each frame of picture in a continuous section of video, and calculating an eye opening threshold value of human eyes;
s3, comparing the eye opening of each frame of picture with an open eye threshold, if the eye opening of two continuous frames of pictures is smaller than the open eye threshold, counting the time interval of the two frames of pictures into temporary closed eye accumulated time, and if the eye opening of the picture is larger than the open eye threshold, resetting the temporary closed eye accumulated time;
s4, if the temporary eye-closing accumulated time exceeds a certain threshold value, the temporary eye-closing accumulated time in the period of time is counted into the eye-closing accumulated time, and meanwhile, the temporary eye-closing accumulated time is cleared;
s5, if the change of the center position of the face is detected to be too large or the change of the rotation angle of the face is detected to be too large within a period of time, no time accumulation is carried out, and the eye closing accumulated time and the temporary eye closing accumulated time are cleared;
s6, presetting an eye opening time threshold, detecting the eye opening time of the human eyes in real time, calculating the eye opening accumulated time, clearing the eye opening accumulated time if the eyes are closed in the eye opening process, and clearing the eye closing accumulated time and the temporary eye closing accumulated time if the eye opening accumulated time exceeds the eye opening time threshold;
and S7, presetting an eye closing accumulated time threshold, and if the eye closing accumulated time is not cleared for a long time and is greater than the eye closing accumulated time threshold, judging that the target driver is in a fatigue state.
2. The method of claim 1, wherein if the detection device does not detect a human face, clearing the cumulative closed-eye time and clearing the cumulative temporary closed-eye time.
3. The method of claim 1, wherein the eye opening threshold of the human eye is updated in real time, and the average value of the eye opening of the human eye in each period of time multiplied by a certain percentage is counted as the eye opening threshold.
4. The method of claim 3, wherein the calculation of the open eye threshold is performed only when the real-time speed of the vehicle exceeds the motion speed threshold and a human face is detected, the open eye threshold fails if the open eye threshold is not updated for a long time, and no accumulated time is performed during the period of the open eye threshold failure.
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Denomination of invention: An Integrated Fatigue Detection Method for MDVR Devices on a Fleet Management Platform

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Granted publication date: 20211214

Pledgee: Bank of China Limited by Share Ltd. Guangzhou Tianhe branch

Pledgor: SHARPVISION CO.,LTD.

Registration number: Y2023980034821

PE01 Entry into force of the registration of the contract for pledge of patent right
CP02 Change in the address of a patent holder
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Address after: 101, Building 6, No.1 Ruihua Road, Tianhe District, Guangzhou, Guangdong 510660

Patentee after: SHARPVISION CO.,LTD.

Address before: 510660 the fifth floor of No.3 in Huangzhou Industrial Park, chebei Road, Tianhe District, Guangzhou City, Guangdong Province

Patentee before: SHARPVISION CO.,LTD.

PC01 Cancellation of the registration of the contract for pledge of patent right
PC01 Cancellation of the registration of the contract for pledge of patent right

Granted publication date: 20211214

Pledgee: Bank of China Limited by Share Ltd. Guangzhou Tianhe branch

Pledgor: SHARPVISION CO.,LTD.

Registration number: Y2023980034821

PE01 Entry into force of the registration of the contract for pledge of patent right
PE01 Entry into force of the registration of the contract for pledge of patent right

Denomination of invention: A fatigue detection method for MDVR equipment integration in a fleet management platform

Granted publication date: 20211214

Pledgee: Bank of China Limited by Share Ltd. Guangzhou Tianhe branch

Pledgor: SHARPVISION CO.,LTD.

Registration number: Y2024980012293