CN114018589A - Method and device for determining air bag ejection speed, electronic equipment and medium - Google Patents

Abstract

The invention relates to the field of automobile collision tests, in particular to a method and a device for determining an air bag ejection speed, electronic equipment and a medium. The method for determining the air bag ejection speed comprises the following steps: decomposing the video popped up by the air bag into frame-by-frame pictures according to the time sequence; placing the grid graph in front of the face of the dummy in each frame of picture; calculating the air bag popping speed according to the number of pixel points between the characteristic points on the air bag contour line in each two adjacent frames of pictures; wherein the characteristic points are points on the airbag contour line which are positioned in the grid diagram. The method can quickly and accurately test the ejection speed of the safety airbag, and provides important reference for the research of the safety performance of the airbag.

Description

Method, device, electronic device and medium for determining airbag ejection speed

technical field

The invention relates to the field of automobile crash testing, in particular to a method, device, electronic device and medium for determining the ejection speed of an airbag.

Background technique

In the traditional car crash test, the crash safety performance of the vehicle is mainly evaluated based on the damage of the dummy and the deformation of key components, reflecting the injury of a specific dummy in a specific seat position. With the improvement of the passive safety level of the car, the more More and more vehicles are getting very good test results. Although the traditional crash test is derived from the typical traffic accident pattern, it is not the recurrence of the real traffic accident. The real traffic accident pattern is quite different from the traditional crash test conditions. Therefore, how to evaluate the performance of the vehicle in the real traffic accident The occupant protection effect is getting more and more attention. The study found that the restraint system of the test vehicle in the traditional crash test condition can assist in judging the potential injury risk of the vehicle occupants in the real traffic accident, and the assessment and evaluation of the above content will help to improve the passive safety level of the vehicle.

In the restraint system of the test vehicle, if the airbags were deployed too fast, the airbags could deploy dangerously, posing a potential risk of injury to the occupant's head. However, the domestic research in this field is relatively late, and the corresponding indicators have not been quantified, and it is impossible to effectively determine whether the airbag is dangerously deployed. Therefore, it is urgent to develop a method for judging the deployment speed of the airbag.

In view of this, the present invention is proposed.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a method for determining the ejection speed of an airbag, so as to realize the effect of being able to judge the ejection speed of the airbag.

In order to achieve the above object, the present invention adopts the following technical solutions:

In a first aspect, the present invention provides a method for determining the ejection speed of an airbag, comprising:

Decompose the video of airbag deployment into frame-by-frame pictures in chronological order;

Place the grid image in front of the dummy's face in each frame;

Calculate the airbag ejection speed according to the number of pixels between the feature points on the airbag contour line in each of the two adjacent frames of pictures;

Wherein, the feature points refer to points on the outline of the airbag that are located in the grid map.

In a second aspect, the present invention provides a device for determining the ejection speed of an airbag, comprising:

The video decomposition module is used to decompose the video of the airbag popping into frame-by-frame pictures in chronological order;

The matching module is used to place the grid image in front of the dummy's face in each frame of the picture;

The speed calculation module is used to calculate the airbag ejection speed according to the number of pixel points between the feature points on the airbag contour line in each adjacent two frames of pictures; Points within the grid plot.

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, and the instructions are executed by the at least one of the processors, so that the at least one of the processors can perform the above-mentioned method.

In a fourth aspect, the present invention provides a medium on which computer instructions are stored, and the computer instructions are used to cause the computer to execute the above method.

Compared with the prior art, the beneficial effects of the present invention are:

The method for determining the airbag popping speed provided by the present invention first decomposes the video of the airbag popping into frame-by-frame pictures in time sequence, thereby obtaining several pictures sorted by the airbag opening time; In front of the face of the dummy, the test state of the airbag in each picture can be matched to the grid map; finally, the airbag ejection speed is calculated according to the number of pixels between the feature points on the outline of the airbag in each adjacent two frames of pictures. . This method can quickly and accurately test the pop-up speed of the airbag, which provides an important reference for the research on the safety performance of the airbag.

Description of drawings

In order to illustrate the specific embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

1 is a flowchart of a method for determining an airbag ejection speed provided in Embodiment 1;

Fig. 2 is the schematic diagram of k-frame picture and grid graph compounding among the embodiment 1;

Fig. 3 is the schematic diagram of k+1 frame picture and grid graph compounding among the embodiment 1;

4 is a schematic structural diagram of a device for determining the ejection speed of an airbag provided in Embodiment 2;

FIG. 5 is a schematic structural diagram of an electronic device provided in Embodiment 3. FIG.

Detailed ways

Exemplary embodiments of the present application are described below with reference to the accompanying drawings, which include various details of the embodiments of the present application to facilitate understanding, and should be considered as exemplary only. Accordingly, those 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 from the following description for clarity and conciseness.

Example 1

FIG. 1 is a flow chart of a method for determining the ejection speed of an airbag provided by the present embodiment. This embodiment is suitable for calculating the ejection speed of the airbag during the vehicle crash test or after the vehicle crash test. The method may be performed by a device for determining the deployment speed of the airbag, which may be constituted by software and/or hardware, and is generally integrated in an electronic device.

Referring to FIG. 1 , the above-mentioned method for determining the ejection speed of the airbag includes the following steps:

S110. Decompose the video of the airbag popping up into frame-by-frame pictures in chronological order.

Among them, the video of the airbag deployment can be captured by high-speed camera equipment, and the video can be imported into the analysis software. The analysis software can derive several frames corresponding to the airbag deployment process, and save the pictures frame by frame.

Preferably, when the video of the airbag popping is decomposed into frame-by-frame pictures, the size of each frame is the same; the video of the airbag popping is a video shot perpendicular to the longitudinal axis of the vehicle. The vehicle longitudinal axis is the axis pointing to the left side of the vehicle. The size of each frame of pictures is the same to ensure the accuracy of the number of coverage grids.

S120. Place the grid image in front of the face of the dummy in each frame of the picture.

Preferably, before placing the grid image in front of the face of the dummy in each frame of pictures, the method further includes: designing the grid image according to the vehicle body marks. Body markings refer to markings affixed to the body for use in vehicle crash testing for positioning.

Preferably, the grid diagram is a square, the grid is composed of 5×5 or 6×6 squares, and the side length of the squares is 30-40mm. For example, the square grid can be set as a 5×5 grid (that is, a grid with 5 rows and 5 columns), and the side length of the grid can be 30, 32, 34, 35, 36, 38 or 40mm, preferably 30mm (with the The length of the body markings is the same, and the body markings are standard length BMW stickers and piano stickers).

Preferably, the grid map is the same distance from the faces of the dummies in each picture. The same distance ensures accuracy when counting the number of grids.

S130: Calculate the airbag ejection speed according to the number of pixels between the feature points on the airbag contour line in each of the two adjacent frames of pictures; wherein, the feature point means that the airbag contour line is located in the grid image the point.

The airbag outline is the outer edge of the airbag shown on the picture.

Preferably, the calculation of the airbag ejection speed according to the number of pixels between the feature points on the airbag outline in each of the two adjacent frames of pictures includes:

Determine the distance between two adjacent pixels according to the distance between the two points on the picture and the number of pixels between the two points;

The airbag ejection speed is calculated according to the distance between the two adjacent pixels, the number of pixels between the feature points on the airbag outline in each of the two adjacent frames, and the time interval between the two adjacent frames.

This preferred embodiment calculates the airbag pop-up speed by calculating the number of pixel points between the feature points, which is convenient and reliable.

Preferably, the distance between the two adjacent pixels is calculated by the following formula: p=L/n, where p is the distance between two adjacent pixels, and L is the difference between the two points on the picture. The distance between the two points, n is the number of pixels between the two points.

Preferably, the calculation is performed according to the distance between the two adjacent pixels, the number of pixels between the feature points on the contour of the airbag in each of the two adjacent frames, and the time interval between the two adjacent frames. Airbag deployment speeds include:

Divide the airbag into j horizontal lines along the up and down direction, according to the distance between the two adjacent pixels, the number of pixels between the feature points on the j horizontal lines in the k frames and k+1 frames, and the k frames and The time interval of k+1 frames of pictures determines the maximum expansion speed in k+1 frames of pictures;

The airbag pop-up speed is calculated according to the maximum deployment speed in the k+1 frames of pictures.

Preferably, the maximum expansion speed in k+1 frames of pictures is calculated by the following formula: v _k+1 =max(v _j ), j=1,2,3..., v _j =mpf, where m is k frames and The number of pixels between the feature points on the j horizontal lines in the k+1 frame picture, p is the distance between two adjacent pixels, f is the time interval between the k frame and k+1 frame picture, v _{k+ 1} is the maximum expansion speed in k+1 frames;

The airbag pop-up speed is calculated by the following formula: v _max =max(v _k+1 ), k=0, 1, 2, . . ., where v _max is the airbag deployment speed.

The above-mentioned method for determining the airbag popping speed first decomposes the video of the airbag popping into frame-by-frame pictures in chronological order, thereby obtaining several pictures sorted by the airbag opening time; In front of the face, the test state of the airbag in each picture can be matched to the grid map; finally, the airbag ejection speed is calculated according to the number of pixels between the feature points on the airbag contour line in each adjacent two frames of pictures. This method can quickly and accurately test the pop-up speed of the airbag, which provides an important reference for the research on the safety performance of the airbag.

FIG. 2 is a schematic diagram of the compounding of k-frame pictures and grid diagrams in this embodiment, and FIG. 3 is a schematic diagram of k+1-frame pictures and grid diagrams in this embodiment, where L is used to determine the adjacent two The distance between two points is the distance between two pixels (it should be understood that the selection of these two points is not limited to the positions shown in the figure, but can be any two points in the picture. In order to improve the calculation accuracy, more The average value of the second calculation), point 1 is one of the feature points on the contour line of the airbag, in the pictures of these two adjacent frames, point 1 is obviously expanded towards the face of the dummy, according to the method of this embodiment, the expansion of point 1 can be The speed is calculated, and the maximum deployment speed in the k+1 frame picture is calculated, and then the airbag deployment speed is calculated.

Example 2

Referring to FIG. 4 , the present embodiment provides a device for determining the ejection speed of an airbag, including:

The video decomposition module 101 is used to decompose the video of the airbag popping into frame-by-frame pictures in chronological order;

The matching module 102 is used for placing the grid image in front of the dummy's face in each frame of pictures;

The speed calculation module 103 is used to calculate the airbag ejection speed according to the number of pixel points between the feature points on the airbag outline in each two adjacent frames of pictures; point within the grid.

Further, the speed calculation module 103 is also used to determine the distance between two adjacent pixels according to the distance between the two points on the picture and the number of pixels between the two points;

The airbag ejection speed is calculated according to the distance between the two adjacent pixels, the number of pixels between the feature points on the airbag outline in each of the two adjacent frames, and the time interval between the two adjacent frames.

Further, the device also includes a grid map design module, which is used for designing a grid map according to the markings of the vehicle body.

The device is used to execute the method for determining the ejection speed of the airbag in the above-mentioned embodiments, and thus at least has functional modules and beneficial effects corresponding to the method.

Example 3

As shown in FIG. 5 , this 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, the instructions being executed by the at least one of the processors to enable the at least one of the processors to perform the method described above. At least one processor in the electronic device is capable of executing the above method and thus has at least the same advantages as the above method.

Optionally, the electronic device further includes interfaces for connecting various 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 otherwise as desired. The processor may process instructions for execution within the electronic device, including storing in or on memory to display a GUI (Graphical User Interface) on an external input/output device, such as a display device coupled to the interface instruction for graphic information. In other embodiments, multiple processors and/or multiple buses may be used with multiple memories and multiple memories, if desired. Likewise, multiple electronic devices may be connected, each providing some of the necessary operations (eg, as a server array, a group of blade servers, or a multiprocessor system). A processor 201 is taken as an example in FIG. 5 .

As a computer-readable storage medium, the memory 202 can be used to store software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the method for determining the ejection speed of the airbag in the embodiment of the present invention (for example, the Determine the video decomposition module 101, the matching module 102 and the speed calculation module 103) in the device. The processor 201 executes various functional applications and data processing of the device by running the software programs, instructions and modules stored in the memory 202 , that is, to implement the above-mentioned method for 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, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Additionally, 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 through a network. Examples of such networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

The electronic device may further include: an input device 203 and an output device 204 . The processor 201 , the memory 202 , the input device 203 and the output device 204 may be connected by a bus or in other ways, and the connection by a bus is taken as an example in FIG. 5 .

The input device 203 can receive input digital or character information, and the output device 204 can include a display device, an auxiliary lighting device (eg, LED), and a tactile feedback device (eg, a 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

This embodiment provides a medium, where computer instructions are stored on the medium, and the computer instructions are used to cause the computer to execute the above method. The computer instructions on the medium are used to cause a computer to perform the above-described method, and thus have at least the same advantages as the above-described method.

The medium in the present invention may adopt any combination of one or more computer-readable mediums. The medium may be a computer-readable signal medium or a computer-readable storage medium. The medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, or a combination of any of the above. More specific examples (non-exhaustive list) of media include: electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read only memory (ROM), erasable Programmable read only memory (EPROM or flash memory), fiber optics, portable compact disk read only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing. In this document, a medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

A computer-readable signal medium may include a propagated data signal in baseband or as part of a carrier wave, with computer-readable program code embodied thereon. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the foregoing. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device .

The program code contained on the computer-readable medium can be transmitted by any suitable medium, including but not limited to wireless, wire, optical fiber cable, RF (Radio Frequency, radio frequency), etc., or any suitable combination of the above.

Computer program code for carrying out operations of the present invention may be written in one or more programming languages, including object-oriented programming languages—such as Java, Smalltalk, C++, but also conventional procedural languages, or a combination thereof. Programming Language - such as the "C" language or similar programming language. 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 (eg, using an Internet service provider through Internet connection).

It should be understood that steps may be reordered, added or deleted using the various forms of flow shown above. For example, the steps described in the present application can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in the present application can be achieved, no limitation is imposed herein.

The above-mentioned specific embodiments do not constitute a limitation on the protection scope of the present application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (10)

1. a determination method of air bag ejection speed, is characterized in that, comprises: Decompose the video of airbag deployment into frame-by-frame pictures in chronological order; Place the grid image in front of the dummy's face in each frame; Calculate the airbag ejection speed according to the number of pixels between the feature points on the airbag contour line in each of the two adjacent frames of pictures; Wherein, the feature points refer to points on the outline of the airbag that are located in the grid map. 2. The method for determining the ejection speed of an airbag according to claim 1, wherein when the video of the airbag ejection is decomposed into frame-by-frame pictures, the size of each frame picture is the same; The video of the airbag popping up is a video shot perpendicular to the longitudinal axis of the vehicle; The grid map is the same distance from the dummy's face in each image. 3. The method for determining the airbag ejection speed according to claim 1, wherein before placing the grid diagram in front of the dummy face in each frame of pictures, it also comprises: designing grid diagrams according to vehicle body marks; The grid diagram is a square, the grid is composed of 5×5 or 6×6 squares, and the side length of the squares is 30-40mm. 4. The method for determining the airbag ejection speed according to claim 1, wherein the calculation of the airbag ejection speed comprises: Determine the distance between two adjacent pixels according to the distance between the two points on the picture and the number of pixels between the two points; The airbag ejection speed is calculated according to the distance between the two adjacent pixels, the number of pixels between the feature points on the airbag outline in each of the two adjacent frames, and the time interval between the two adjacent frames. 5 . The method for determining the ejection speed of an airbag according to claim 4 , wherein the distance between the two adjacent pixels is calculated by the following formula: p=L/n, where p is the two adjacent pixels. 6 . The distance between pixels, L is the distance between two points on the picture, and n is the number of pixels between the two points. 6 . The method for determining the ejection speed of an airbag according to claim 5 , wherein, according to the distance between the two adjacent pixel points, the distance between the feature points on the airbag contour line in each of the adjacent two frames of pictures The number of pixels between and the time interval between two adjacent frames of pictures, the calculation of the airbag popping speed includes: Divide the airbag into j horizontal lines along the up and down direction, according to the distance between the two adjacent pixels, the number of pixels between the feature points on the j horizontal lines in the k frames and k+1 frames, and the k frames and The time interval of k+1 frames of pictures determines the maximum expansion speed in k+1 frames of pictures; The airbag pop-up speed is calculated according to the maximum deployment speed in the k+1 frames of pictures. 7. The method for determining the ejection speed of an airbag according to claim 6, wherein the maximum deployment speed in the k+1 frame picture is calculated by the following formula: v _k+1 =max(v _j ), j=1, 2,3...,v _j =mpf, where m is the number of pixels between the feature points on the j horizontal lines in the k frame and k+1 frame picture, p is the distance between two adjacent pixels, f is the time interval between k frames and k+1 frames, and v _k+1 is the maximum expansion speed in k+1 frames; The airbag pop-up speed is calculated by the following formula: v _max =max(v _k+1 ), k=0, 1, 2, . . ., where v _max is the airbag deployment speed. 8. A device for determining the ejection speed of an airbag, comprising: The video decomposition module is used to decompose the video of the airbag popping into frame-by-frame pictures in chronological order; The matching module is used to place the grid image in front of the dummy's face in each frame of the picture; The speed calculation module is used to calculate the airbag ejection speed according to the number of pixel points between the feature points on the airbag contour line in each adjacent two frames of pictures; Points within the grid plot. 9. An electronic device, characterized in that, 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 are executed by the at least one of the processors, so that the at least one of the processors can perform the execution of any one of claims 1-7. method described. 10. A medium, wherein computer instructions are stored on the medium, and the computer instructions are used to cause the computer to execute the method of any one of claims 1-7.

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