CN114018589B - Method and device for determining airbag ejection speed, electronic equipment and medium - Google Patents
Method and device for determining airbag ejection speed, electronic equipment and medium Download PDFInfo
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention relates to the field of automobile collision test, in particular to a method and a device for determining an airbag ejection speed, electronic equipment and a medium. The method for determining the airbag ejection speed comprises the following steps: decomposing the video ejected by the air bag into pictures frame by frame in time sequence; placing the grid map in front of the face of the dummy in each frame of picture; calculating the airbag ejection speed according to the number of pixel points between characteristic points on the airbag contour lines in every two adjacent frames of pictures; the characteristic points are points located in the grid chart on the outline of the air bag. The method can rapidly and accurately test the ejection speed of the safety airbag, and provides an important reference for the research of the safety performance of the airbag.
Description
Technical Field
The invention relates to the field of automobile collision test, in particular to a method and a device for determining an airbag ejection speed, electronic equipment and a medium.
Background
In the traditional automobile collision test, the collision safety performance of the automobile is mainly evaluated based on the damage of a dummy and the deformation of key parts, the damage condition of a specific dummy at a specific seat position is reflected, and along with the improvement of the passive safety level of the automobile, more and more automobiles obtain very good test results. Although the conventional crash test is derived from a typical traffic accident situation, it is not a real traffic accident situation that is greatly different from the conventional crash test conditions, so how to evaluate the occupant protection effect of a vehicle in a real traffic accident is becoming more interesting. The research finds that the restraint system of the test vehicle in the traditional collision test working condition can assist in judging the potential injury risk of passengers of the vehicle in a real traffic accident, and the assessment and evaluation of the above matters are helpful for improving the passive safety level of the vehicle.
In restraint systems for test vehicles, if the airbag ejection speed is too high, dangerous deployment of the airbag may result, thereby presenting a potential risk of injury to the occupant's head. However, research and development in this field are relatively late in China, and quantification of corresponding indexes is not realized, and whether an airbag is dangerous to be deployed or not cannot be effectively judged, so that a method for judging the ejection speed of the airbag is needed to be studied urgently.
In view of this, the present invention has been made.
Disclosure of Invention
The invention aims to provide a method for determining an airbag ejection speed, so as to realize the effect of judging the airbag ejection speed.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect, the present invention provides a method for determining an airbag ejection speed, including:
decomposing the video ejected by the air bag into pictures frame by frame in time sequence;
placing the grid map in front of the face of the dummy in each frame of picture;
calculating the airbag ejection speed according to the number of pixel points between characteristic points on the airbag contour lines in every two adjacent frames of pictures;
the characteristic points are points located in the grid chart on the outline of the air bag.
In a second aspect, the present invention provides a determination apparatus of an airbag ejection speed, comprising:
the video decomposition module is used for decomposing the video ejected by the air bag into pictures frame by frame in time sequence;
the matching module is used for placing the grid image in front of the face of the dummy in each frame of image;
the speed calculation module is used for calculating the airbag ejection speed according to the number of pixel points between the characteristic points on the airbag contour lines in every two adjacent frames of pictures; the characteristic points are points located in the grid chart on the outline of the air bag.
In a third aspect, the present invention provides an electronic device, comprising:
at least one processor, and a memory communicatively coupled to at least one of the processors;
wherein the memory stores instructions executable by at least one of the processors, the instructions being executable by at least one of the processors to enable at least one of the processors to perform the method described above.
In a fourth aspect, the present invention provides a medium having stored thereon computer instructions for causing a computer to perform the above-described method.
Compared with the prior art, the invention has the beneficial effects that:
the method for determining the airbag ejection speed comprises the steps of firstly decomposing a video ejected by an airbag into pictures frame by frame according to time sequence, so as to obtain a plurality of pictures ordered according to airbag opening time; placing the grid pattern in front of the face of the dummy in each frame of picture, so that the test state of the air bag on each picture can be matched with the grid pattern; and finally, calculating the airbag ejection speed according to the number of pixel points between the characteristic points on the airbag contour lines in every two adjacent frames of pictures. The method can rapidly and accurately test the ejection speed of the safety airbag, and provides an important reference for the research of the safety performance of the airbag.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method of determining an airbag ejection speed provided in embodiment 1;
FIG. 2 is a schematic diagram of the combination of k-frame pictures and grid patterns in example 1;
FIG. 3 is a schematic diagram of the combination of k+1 frame pictures and grid patterns in example 1;
fig. 4 is a schematic structural view of an airbag ejection speed determining device provided in embodiment 2;
fig. 5 is a schematic structural diagram of an electronic device provided in embodiment 3.
Detailed Description
Exemplary embodiments of the present application are described below in conjunction with the accompanying drawings, which include various details of the embodiments of the present application to facilitate understanding, and should be considered as merely exemplary. Accordingly, one of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present application. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
Example 1
Fig. 1 is a flowchart of a method for determining an airbag ejection speed according to the present embodiment, which is suitable for calculating the airbag ejection speed during or after the vehicle collision test. The method may be performed by a means for determining the airbag ejection speed, which means may be constituted by software and/or hardware and are typically integrated in an electronic device.
Referring to fig. 1, the method for determining the airbag ejection speed includes the steps of:
s110, decomposing the video popped up by the air bag into pictures frame by frame in time sequence.
The video shot by the high-speed camera device can be imported into analysis software, a plurality of frames corresponding to the airbag unfolding process are exported by the analysis software, and pictures are stored frame by frame.
Preferably, when the video popped up by the air bag is decomposed into frame-by-frame pictures, the sizes of the frame pictures are the same; the video of the airbag ejection is a video shot perpendicular to the longitudinal axis of the vehicle. The longitudinal axis of the vehicle is the axis pointing to the left of the vehicle. The accuracy of counting the number of the coverage grids can be ensured by the same size of each frame of picture.
S120, placing the grid pattern in front of the face of the dummy in each frame of picture.
Preferably, before placing the grid pattern in front of the face of the dummy in each frame of pictures, the method further comprises: and designing a grid chart according to the vehicle body marks. The vehicle body mark means a mark for positioning when applied to a vehicle body for a vehicle collision test.
Preferably, the grid pattern is square, the grid consists of 5×5 or 6×6 grids, and the grid side length is 30-40mm. For example, a square grid may be provided as a 5 x 5 square (i.e., a 5 row and 5 column square) square with a side length of 30, 32, 34, 35, 36, 38, or 40mm, preferably 30mm (consistent with the length of the body label, which is a standard length BMW and piano label).
Preferably, the grid pattern is the same distance as the dummy face in each picture. The same distance can ensure accuracy in counting the number of lattices.
S130, calculating the airbag ejection speed according to the number of pixel points between characteristic points on the airbag contour lines in every two adjacent frames of pictures; the characteristic points are points located in the grid chart on the outline of the air bag.
The outline of the airbag refers to the outer edge of the airbag shown on the picture.
Preferably, the calculating the airbag ejection speed according to the number of pixel points between feature points on the airbag contour lines in each two adjacent frames of pictures includes:
determining the distance between two adjacent pixel points according to the distance between two points on the picture and the number of the pixel points between the two points;
and calculating the airbag ejection speed according to the distance between the two adjacent pixel points, the number of the pixel points between the characteristic points on the airbag contour lines in each two adjacent frames of pictures and the time interval between the two adjacent frames of pictures.
According to the preferred embodiment, the airbag ejection speed is calculated by calculating the number of pixel points among the characteristic points, so that the method is convenient and reliable.
Preferably, the distance between the two adjacent pixel points is calculated by the following formula: p=l/n, where p is the distance between two adjacent pixels, L is the distance between two points on the picture, and n is the number of pixels between the two points.
Preferably, the calculating the airbag pop-up speed according to the distance between the two adjacent pixels, the number of pixels between the feature points on the airbag contour line in each two adjacent frames of pictures, and the time interval between the two adjacent frames of pictures includes:
dividing the air bag into j horizontal lines along the up-down direction, and determining the maximum unfolding speed in the k+1 frame of pictures according to the distance between two adjacent pixel points, the number of the pixel points between the characteristic points on the j horizontal lines in the k frame of pictures and the k+1 frame of pictures and the time interval between the k frame of pictures and the k+1 frame of pictures;
and calculating the air bag ejecting speed according to the maximum unfolding speed in the k+1 frame of pictures.
Preferably, the maximum expansion speed in k+1 frame pictures is calculated using the following formula: v k+1 =max(v j )，j=1,2,3…，v j M is the number of pixel points between the feature points on j horizontal lines in k frames and k+1 frames of pictures, p is the distance between two adjacent pixel points, f is the time interval between k frames and k+1 frames of pictures, v k+1 The maximum unfolding speed in the k+1 frame of pictures is set;
the airbag ejection speed is calculated using the following formula: v max =max(v k+1 ) K=0, 1,2, …, wherein v max Is the airbag deployment speed.
The method for determining the airbag ejection speed comprises the steps of firstly decomposing a video ejected by an airbag into pictures frame by frame according to time sequence, so as to obtain a plurality of pictures ordered according to airbag opening time; placing the grid pattern in front of the face of the dummy in each frame of picture, so that the test state of the air bag on each picture can be matched with the grid pattern; and finally, calculating the airbag ejection speed according to the number of pixel points between the characteristic points on the airbag contour lines in every two adjacent frames of pictures. The method can rapidly and accurately test the ejection speed of the safety airbag, and provides an important reference for the research of the safety performance of the airbag.
Fig. 2 is a schematic diagram of combining a k frame picture and a grid picture in this embodiment, fig. 3 is a schematic diagram of combining a k+1 frame picture and a grid picture in this embodiment, where L is a distance between two points on the picture for determining a distance between two adjacent pixel points (it should be understood that selection of the two points is not limited to a position illustrated, and may be any two points in the picture, and in order to improve calculation accuracy, the point 1 may be calculated multiple times to obtain an average value), and the point 1 is one of characteristic points on an outline of an airbag, in the two pictures of adjacent frames, the point 1 is obviously deployed toward a face of a dummy, and the deployment speed of the point 1 may be calculated by the method according to this embodiment, and the maximum deployment speed in the k+1 frame picture may be calculated, so as to calculate the airbag ejection speed.
Example 2
Referring to fig. 4, the present embodiment provides a determination apparatus of an airbag ejection speed, including:
a video decomposition module 101, configured to decompose a video popped up by an air bag into frame-by-frame pictures in time sequence;
a matching module 102, configured to place the grid pattern in front of the face of the dummy in each frame of picture;
the speed calculation module 103 is configured to calculate an airbag ejection speed according to the number of pixel points between feature points on an airbag contour line in each two adjacent frames of pictures; the characteristic points are points located in the grid chart on the outline of the air bag.
Further, the speed calculation module 103 is further configured to determine a distance between two adjacent pixels according to a distance between two points on the picture and the number of pixels between the two points;
and calculating the airbag ejection speed according to the distance between the two adjacent pixel points, the number of the pixel points between the characteristic points on the airbag contour lines in each two adjacent frames of pictures and the time interval between the two adjacent frames of pictures.
Further, the device also comprises a grid pattern design module for designing the grid pattern according to the vehicle body marks.
The apparatus is used to perform the method of determining the airbag ejection speed in the above-described embodiment, and thus has at least the functional module and advantageous effects corresponding to the method.
Example 3
As shown in fig. 5, the present embodiment provides an electronic device, including:
at least one processor; and
a memory communicatively coupled to at least one of the processors; wherein,
the memory stores instructions executable by at least one of the processors to enable the at least one processor to perform the method described above. At least one processor in the electronic device is capable of performing the above-described method and thus has at least the same advantages as the above-described method.
Optionally, the electronic device further includes an interface for connecting the components, including a high-speed interface and a low-speed interface. The various components are interconnected using different buses and may be mounted on a common motherboard or in other manners as desired. The processor may process instructions executing within the electronic device, including instructions stored in or on memory to display graphical information of a GUI (Graphical User Interface ) on an external input/output device, such as a display device coupled to the interface. In other embodiments, multiple processors and/or multiple buses may be used, if desired, along with multiple memories and multiple memories. Also, multiple electronic devices may be connected, each providing a portion of the necessary operations (e.g., as a server array, a set of blade servers, or a multiprocessor system). One processor 201 is illustrated in fig. 5.
The memory 202 is a computer readable storage medium, and may be used to store a software program, a computer executable program, and modules, such as program instructions/modules corresponding to the method for determining the airbag ejection speed in the embodiment of the present invention (for example, the video decomposition module 101, the matching module 102, and the speed calculation module 103 in the apparatus for determining the airbag ejection speed). The processor 201 executes various functional applications of the apparatus and data processing by executing software programs, instructions, and modules stored in the memory 202, that is, implements the above-described method of determining the airbag ejection speed.
The memory 202 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for functions; the storage data area may store data created according to the use of the terminal, etc. In addition, memory 202 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some examples, memory 202 may further include memory located remotely from processor 201, which may be connected to the device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The electronic device may further include: an input device 203 and an output device 204. The processor 201, memory 202, input devices 203, and output devices 204 may be connected by a bus or other means, for example in fig. 5.
The input means 203 may receive input digital or character information, and the output means 204 may include a display device, auxiliary lighting means (e.g., LED), tactile feedback means (e.g., vibration motor), and the like. The display device may include, but is not limited to, a Liquid Crystal Display (LCD), a Light Emitting Diode (LED) display, and a plasma display. In some implementations, the display device may be a touch screen.
Example 4
The present embodiment provides a medium having stored thereon computer instructions for causing the computer to perform the above-described method. The computer instructions on the medium are for causing a computer to perform the above method and thus have at least the same advantages as the above method.
Any combination of one or more computer readable media may be employed in the present invention. The medium may be a computer readable signal medium or a computer readable storage medium. The medium can be, for example but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the medium include: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this document, a medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF (Radio Frequency) and the like, or any suitable combination of the foregoing.
Computer program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present application may be performed in parallel, sequentially, or in a different order, provided that the desired results of the technical solutions disclosed in the present application can be achieved, and are not limited herein.
The above embodiments do not limit the scope of the application. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application are intended to be included within the scope of the present application.
Claims (6)
1. A method of determining an airbag ejection speed, comprising:
decomposing the video ejected by the air bag into pictures frame by frame in time sequence;
placing the grid map in front of the face of the dummy in each frame of picture;
calculating the airbag ejection speed according to the number of pixel points between characteristic points on the airbag contour lines in every two adjacent frames of pictures;
wherein the characteristic points are points located in the grid graph on the outline of the air bag;
according to the number of pixel points between characteristic points on the outline of the air bag in each two adjacent frames of pictures, calculating the air bag ejecting speed comprises the following steps:
calculating a distance p between two adjacent pixel points: p=l/n, where L is the distance between two points on the picture and n is the number of pixel points between the two points;
dividing the air bag into j horizontal lines along the up-down direction, and calculating the maximum unfolding speed v in the k+1 frame of picture by adopting the following method k+1 ：v k+1 =max(v j )，j=1,2,3…，v j Mp/f, where m is the number of pixel points between the feature points on j horizontal lines in k frames and k+1 frames of pictures, p is the distance between two adjacent pixel points, and f is the time interval between k frames and k+1 frames of pictures;
the airbag ejection speed was calculated using the following: v max =max(v k+1 ) K=0, 1,2, …, wherein v max Is the airbag deployment speed.
2. The method according to claim 1, wherein when decomposing the video of airbag ejection into frame-by-frame pictures, the size of each frame picture is the same;
the video of the airbag ejection is a video shot perpendicular to the longitudinal axis of the vehicle;
the grid pattern is the same as the distance of the dummy face in each picture.
3. The method of determining an airbag ejection speed according to claim 1, further comprising, before placing the mesh map in front of the face of the dummy in each frame of the pictures: designing a grid chart according to the vehicle body mark;
the grid pattern is square, the grid consists of 5X 5 or 6X 6 square grids, and the square grid side length is 30-40mm.
4. An airbag ejection speed determining apparatus, comprising:
the video decomposition module is used for decomposing the video ejected by the air bag into pictures frame by frame in time sequence;
the matching module is used for placing the grid image in front of the face of the dummy in each frame of image;
the speed calculation module is used for calculating the airbag ejection speed according to the number of pixel points between the characteristic points on the airbag contour lines in every two adjacent frames of pictures; wherein the characteristic points are points located in the grid graph on the outline of the air bag;
according to the number of pixel points between characteristic points on the outline of the air bag in each two adjacent frames of pictures, calculating the air bag ejecting speed comprises the following steps:
calculating a distance p between two adjacent pixel points: p=l/n, where L is the distance between two points on the picture and n is the number of pixel points between the two points;
dividing the air bag into j horizontal lines along the up-down direction, and calculating the maximum unfolding speed v in the k+1 frame of picture by adopting the following method k+1 ：v k+1 =max(v j )，j=1,2,3…，v j = mpf, where m is the number of pixel points between the feature points on j horizontal lines in k frames and k+1 frames of pictures, p is the distance between two adjacent pixel points, and f is the time interval between k frames and k+1 frames of pictures;
the airbag ejection speed was calculated using the following: v max =max(v k+1 ) K=0, 1,2, …, wherein v max Is the airbag deployment speed.
5. An electronic device, comprising:
at least one processor, and a memory communicatively coupled to at least one of the processors;
wherein the memory stores instructions executable by at least one of the processors, the instructions being executable by at least one of the processors to enable the at least one of the processors to perform the method of any one of claims 1-3.
6. A medium having stored thereon computer instructions for causing the computer to perform the method of any of claims 1-3.
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