Method and system for measuring content of needle-sheet pea gravel based on image processing

Abstract

The embodiment of the invention provides a method and system for measuring the content of needle-sheet pea gravels based on image processing, and the method comprises the steps: obtaining a plurality of pea gravels, cleaning and drying the obtained pea gravels, weighing the pea gravels, and recording the initial weight of the pea gravels; placing the processed pea gravels on a glass plate which is spliced into a step shape, projecting the pea gravels on the glass plate in three different directions, respectively shooting the projections in the three different directions by using an industrial camera, and acquiring projection images; the collected projection image is imported into image analysis software for image analysis, and the measurement size of the pea gravel in the projection image is obtained; screening the sizes of the pea gravels based on a preset size threshold value, selecting needle-sheet-shaped pea gravels, and weighing the screened needle-sheet-shaped pea gravels to obtain an actual weight; and calculating the ratio of the actual weight to the initial weight to obtain the actual content of the acicular pea gravel.

Description

Technical Field

[0001] This document relates to the field of aggregate particle identification technology, and in particular to a method and system for determining the content of needle-like pea gravel based on image processing. Background Art

[0002] During the construction of a tunnel boring machine (TBM), in order to maintain the stability of the tunnel, prevent ground collapse, and reduce water and soil seepage, synchronous grouting technology is used. When performing TBM synchronous grouting, in order to ensure the effectiveness of grouting and the quality of the project, the content of needle-like pea gravel needs to be controlled to be no more than 25%. Needle-like particles are too slender or flat, which is easy to break during the construction process, and a large amount of needle-like pea gravel will form large gaps and hinder the flow of slurry. Therefore, determining the content of needle-like pea gravel and controlling it within a specific range can improve the quality and effect of synchronous grouting, effectively ensure that the surrounding rock is effectively supported and reinforced, reduce the possibility of ground settlement, and ensure the stability of the pipe segment and the safety of the tunnel.

[0003] The traditional method for calculating the content of needle-like pea gravel is to take out a representative part of the sample and place it flat on the workbench, and use the gauge method or vernier caliper to measure its maximum dimensions in length, width and thickness for multiple times, and take the average of the measured data. If the ratio of its length to thickness exceeds a certain value (3:1 or 4:1, etc.) in the specification, it is needle-like pea gravel. After selecting the aggregate identified as needle-like pea gravel, weigh it and calculate the percentage to obtain its content. This method requires measuring the pea gravel in turn, which is frequent and inefficient, and the measurement accuracy depends on the operator's experience. Therefore, in order to cooperate with the ever-increasing construction progress, improve construction efficiency and measurement accuracy, it is necessary to propose a new method for measuring the size and determining the content of needle-like pea gravel. Summary of the invention

[0004] One or more embodiments of this specification provide a method for determining the content of needle-shaped pea gravel based on image processing, comprising:

[0005] S1. Obtain some pea gravel, wash and dry the obtained pea gravel, weigh it, and record the initial weight of the pea gravel;

[0006] S2, placing the processed pea gravel on a glass plate spliced ​​into a step shape, projecting the pea gravel on the glass plate in three different directions, using an industrial camera to respectively photograph the projections in the three different directions, and collecting projection images;

[0007] S3, importing the collected projection image into image analysis software for image analysis to obtain the measured size of the pea gravel in the projection image;

[0008] S4, screening the size of the pea gravel based on a preset size threshold, selecting the needle-shaped pea gravel and weighing the screened needle-shaped pea gravel to obtain an actual weight;

[0009] S5. Calculate the actual content of the needle-like pea gravel by calculating the ratio of the actual weight to the initial weight.

[0010] Furthermore, the method of obtaining a number of pea gravels, washing and drying the obtained pea gravels, and then weighing and recording the initial weight of the pea gravels is as follows:

[0011] Randomly obtain a number of pea gravels, place the pea gravels in clean water to wash, and take them out after soaking for 30 minutes;

[0012] Place the soaked pea gravel in an oven at 105 degrees Celsius for drying and take it out after 1 hour;

[0013] Weigh the dried pea gravel to obtain the total weight of the pea gravel;

[0014] Repeat the above drying process several times until the total weight changes within the specified range, and record the total weight at this time as the initial weight.

[0015] Furthermore, the method for preparing the stepped glass plate is specifically as follows:

[0016] Select a glass plate with a length and width of 1.5 times the maximum size of the obtained pea gravel, isotropic, small and uniform thickness, and two parallel sides, bond the glass plate in a step shape, and outline the glass plate;

[0017] For a vertical glass plate, the stroke lines around its plane coincide with the thickness stroke lines of the horizontal glass plate;

[0018] Industrial glue is used to bond glass plates to construct a stepped glass frame, wherein the interior of the glass frame is hollowed out, leaving only one side with a stepped layer;

[0019] Number each glass plate sequentially.

[0020] Furthermore, the pea gravel on the glass plate is projected in three different directions, and the projections in the three different directions are photographed respectively using an industrial camera. The specific method for collecting the projection images is as follows:

[0021] Place the screen on one side to facilitate shooting of the projection of the glass plate on the screen, place the parallel light plate on the other side of the glass plate, and place the industrial camera on the back of the screen;

[0022] According to the number of horizontal glass plates, place the same number of bean gravels to be tested on the horizontal glass plates one by one, with only one bean gravel to be tested placed on each horizontal glass plate, and the bean gravels to be tested are placed in the center of the surface of the horizontal glass plate;

[0023] The projections of the pea gravel and the edge lines of the glass plate on the screen are photographed by an industrial camera, so as to obtain three-view projection images of the glass plate and the multiple pea gravel placed thereon, wherein each square enclosed by the edge lines of the glass plate includes one pea gravel.

[0024] Furthermore, the size of the curtain is at least 1.5 times the size of the stepped glass frame, and the curtain is parallel to the corresponding glass plate surface; the size of the parallel light board is at least 1.5 times the size of the stepped glass frame, and the parallel light board is parallel to the corresponding glass plate surface and the curtain.

[0025] Furthermore, the method of photographing the projection of the pea gravel and the edge line of the glass plate on the screen by placing an industrial camera is as follows:

[0026] The parallel light plates in different directions are opened and closed in turn, and the projection of the squares surrounded by the stroke lines on the screen is photographed in the directions of the three views.

[0027] Furthermore, the method for calculating the measurement size of the pea gravel is:

[0028] For the same piece of pea gravel, in the three projection images in the three-view direction, the length of any square surrounded by the stroked line is selected as the reference size, and the size of all the squares surrounded by the stroked line and the measured size of the pea gravel to be measured are measured;

[0029] The size of the pea gravel in each direction was measured by image analysis software, and the actual size of the pea gravel was obtained by taking the average value.

[0030] One or more embodiments of this specification provide a system for measuring the content of needle-shaped pea gravel based on image processing, comprising:

[0031] The first weighing module is used to obtain a number of pea gravels, wash and dry the obtained pea gravels, weigh them, and record the initial weight of the pea gravels;

[0032] Image acquisition module: used to place the processed pea gravel on a glass plate spliced ​​into a step shape, project the pea gravel on the glass plate in three different directions, use an industrial camera to shoot the projections in the three different directions respectively, and collect the projection images;

[0033] Size measurement module: used to import the collected projection image into the image analysis software for image analysis to obtain the measured size of the pea gravel in the projection image;

[0034] The second weighing module is used to screen the size of the pea gravel based on a preset size threshold, select the needle-shaped pea gravel and weigh the screened needle-shaped pea gravel to obtain the actual weight;

[0035] Content calculation module: used for obtaining the actual content of needle-shaped pea gravel by calculating the ratio of the actual weight to the initial weight.

[0036] One or more embodiments of the present specification provide an electronic device, including:

[0037] processor; and,

[0038] A memory is arranged to store computer executable instructions, which, when executed, cause the processor to implement the steps of the needle-shaped pea gravel content determination method based on image processing.

[0039] One or more embodiments of the present specification provide a storage medium for storing computer-executable instructions, which, when executed, implement the steps of the needle-like pea gravel content determination method based on image processing.

[0040] The present invention is based on image processing technology, and measures the front and back, left and right, and top and bottom directions of the measured pea gravel. It can measure the sizes of more pea gravels more conveniently and quickly, and obtain the same size data multiple times, and take the average value of the same size data to obtain a more accurate actual size, avoiding the error problems caused by material, shooting, light, etc. The method can simply and effectively measure the size of pea gravel and determine the content of needle-shaped pea gravel, and provides a more convenient, fast and accurate method for aggregate evaluation through simple spatial measurement.

[0041] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate one or more embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0043] Figure 1A flowchart of a method for determining the content of needle-shaped pea gravel based on image processing provided in one or more embodiments of this specification;

[0044] Figure 2 A schematic diagram of glass plate assembly for a method for determining the content of needle-like pea gravel based on image processing provided in one or more embodiments of this specification;

[0045] Figure 3 A schematic diagram of a measurement site layout for a method for determining the content of needle-shaped pea gravel based on image processing provided in one or more embodiments of this specification;

[0046] Figure 4 Three-view screen projection of a method for determining the content of needle-shaped pea gravel based on image processing provided in one or more embodiments of this specification;

[0047] Figure 5 A schematic diagram of the composition of a needle-shaped pea gravel content determination system based on image processing provided in one or more embodiments of this specification;

[0048] Figure 6 A schematic diagram of the structure of an electronic device provided for one or more embodiments of this specification. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the technical solutions in one or more embodiments of this specification, the following will be combined with the drawings in one or more embodiments of this specification to clearly and completely describe the technical solutions in one or more embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on one or more embodiments of this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this document.

[0050] Method Embodiment

[0051] According to an embodiment of the present invention, a method for determining the content of needle-shaped pea gravel based on image processing is provided. Figure 1 A flowchart of a method for determining the content of needle-shaped pea gravel based on image processing provided in one or more embodiments of this specification, such as Figure 1 As shown, the method for determining the content of needle-shaped pea gravel based on image processing according to an embodiment of the present invention specifically includes:

[0052] S1. Obtain some pea gravel, wash and dry the obtained pea gravel, weigh it, and record the initial weight of the pea gravel.

[0053] In this embodiment, a number of pea gravels that can represent the properties of the material pile are randomly obtained from the material pile at the construction site for cleaning, drying and weighing: first, the pea gravels are placed in clean water for cleaning, and taken out after soaking for 30 minutes; the soaked pea gravels are placed in an oven at 105 degrees Celsius for drying, and taken out after 1 hour; then the dried pea gravels are weighed using an electronic scale to obtain the total weight of the pea gravels, recorded as M (g); the above drying process is repeated many times until the total weight M (g) obtained is within the specified range, and the total weight at this time is recorded as the initial weight.

[0054] S2. placing the processed pea gravel on a glass plate spliced ​​into a step shape, projecting the pea gravel on the glass plate in three different directions, and using an industrial camera to respectively photograph the projections in the three different directions to collect projection images.

[0055] Among them, the stepped glass plates are Figure 2 As shown, the splicing preparation method is specifically as follows: select a glass plate with a length and width of 1.5 times the maximum pea gravel size, isotropic, small and uniform thickness, and parallel surfaces, bond the glass plates in a step-like shape, and use lines with a width equal to the thickness of the glass plates to outline the glass plates according to the thickness and the surrounding planes. When bonding the glass plates, for the vertical glass plates, the outline lines on the surrounding planes coincide with the thickness outline lines of the horizontal glass plates to ensure that the shadow of the pea gravel is not blocked by the outline lines; use industrial glue to bond the glass plates to construct a step-like glass frame, wherein the interior of the glass frame is hollowed out, and only one side with a step layer is retained; during the bonding process of the glass plates, the edges (outline lines) of the glass plates must be accurately aligned, and each glass plate must be numbered in order.

[0056] Arrange the shooting location, such as Figure 3As shown, the screen is placed on the side that is convenient for shooting the projection of the glass plate on the screen, the parallel light plate is placed on the other side of the glass plate, and the industrial camera is placed on the back of the screen. Specifically, because parallel light may shift when passing through the above-mentioned glass plate, the size of the light screen is about 1.5 times the size of the glass frame to ensure that the projection of the glass frame can be fully displayed on the screen. In the front, back, left, right, and top directions of the glass frame, the screen is placed on one side of the glass frame (back, left, and top) that is convenient for shooting the projection of the glass frame, and the screen is parallel to the corresponding glass plate surface; prepare a standard parallel light board, the size of the light board is about 1.5 times the size of the glass frame, and the intensity of the light is evenly distributed. The parallel light board is placed at a distance from the glass frame to ensure that the light passing through the glass frame is as parallel as possible. , make the projection and the real object as equal in size as possible, place the parallel light board to the other side (front, right, and bottom) of the glass frame in the front, back, left, right, and top and bottom directions, and ensure that the parallel light board is parallel to the corresponding glass plate surface and the screen; prepare the industrial camera for shooting, and adjust the distance between the camera and the screen appropriately on the back of the screen so that the entire screen can be fully captured. Use a bracket to fix the industrial camera to ensure that its position and angle remain constant (lighting, background) throughout the shooting process, and ensure that the picture will not be stretched or compressed in the horizontal or numerical direction due to different shooting positions and angles.

[0057] In this embodiment, the projection of the pea gravel and the glass plate stroke line on the screen is photographed by placing an industrial camera. Specifically, the parallel light plates in different directions are opened and closed in turn, and the projection of the squares surrounded by the stroke lines on the screen is photographed in three directions (front and back, left and right, and up and down), and the pictures of the squares surrounded by the glass plate stroke lines are obtained. The three pictures obtained (front and back, left and right, and up and down) are processed, and the pictures taken in the front and back directions are first imported into the IPP. In the three pictures, the length of any square surrounded by the stroke lines is selected as the reference size, and the size of all the squares surrounded by the stroke lines is measured. Export relevant data and analyze whether the error caused by production reasons is within the range specified in the specification. Under ideal conditions, the ratio of projection to actual object should be 1:1. If the error is too large, it is necessary to recheck the glass plate material, adjust the model splicing, light board assembly, camera parameters, etc. until the error is within the allowable range.

[0058] In this embodiment, IPP is used to carry out dimension measurement. The measurement data of IPP is set to measure length (mm) and width (mm), and the measurement object is set to the square surrounded by the stroke line. In the picture, the length of the square surrounded by the stroke line is arbitrarily selected as the reference size, and the size (length and width) of the remaining squares is calculated. Export the measured dimension data to Excel. Import the remaining pictures taken in the left and right, up and down directions into IPP in turn, and repeat the above steps. Analyze the measured dimensions with the same number in the three sets of data to verify whether the light is parallel light; whether the projection size is the same size as the actual object or the error caused by production is within the range specified by the specification. Under ideal conditions, the ratio of projection to actual object should be 1:1, but due to production process limitations, the projection may be scaled. According to the set reference length, calculate whether the error is within the specified range; if the error is too large, it is necessary to recheck the glass plate material, adjust the model splicing, light plate assembly, etc. until the error is within the allowable range.

[0059] Place the processed pea gravel on the glass plates spliced ​​into steps. In this embodiment, according to the number of horizontal glass plates, place the same number of pea gravel to be tested on the horizontal glass plates one by one. Only one pea gravel to be tested is placed on each horizontal glass plate. The pea gravel to be tested is placed in the center of the surface of the horizontal glass plate to ensure that the projection of the pea gravel on the screen is not blocked by the projection of the outline line. Record the glass plate number where the pea gravel is placed.

[0060] Project the pea gravel on the glass plate in three different directions, and use an industrial camera to take pictures of the projections in three different directions. After completion, obtain the three-view projection images of the glass plate and the multiple pea gravels placed on it. Each square surrounded by the stroke line of the glass plate includes a pea gravel, such as Figure 4 shown.

[0061] S3. Importing the collected projection image into image analysis software for image analysis to obtain the measured size of the pea gravel in the projection image.

[0062] First, import the pictures taken in the front and back directions into IPP, and use IPP to carry out the dimensional measurement. Set the measurement data of IPP to measure length (mm) and width (mm). Set the measurement object to be pea gravel, select the length of the square surrounded by the same stroke line as the reference size, measure the size of the pea gravel to be measured, and obtain the dimensional data (length and width) of the pea gravel in the front and back directions. Import the remaining left-right (width, height) and top-bottom (length, height) pictures into IPP in turn, and repeat the above process. Use IPP to calculate the size of the pea gravel in each direction and export the relevant data.

[0063] The actual size of the pea gravel is obtained by taking the average value Specific:

[0064] The dimensional data of the pea gravel obtained above in three directions Export to Excel respectively. Due to the refraction of light by the glass plate and the fact that light cannot be completely straight, errors μ caused by materials, shooting, light, etc. will occur. Since the projection is shot in three directions, the size data (length, width, height) will be repeated in pairs. For the data with the same number and the same size, take the average value of the corresponding size and use formula 1 to further reduce the errors caused by materials, shooting, light, etc.

[0065]

[0066] Among them, f i is the actual size of the i-pea gravel at position i; is the actual size of the i-pea gravel in the 1 direction; is the actual size of the pea gravel in the 2 directions.

[0067] S4. Screening the pea gravel size based on a preset size threshold, selecting the needle-shaped pea gravel, and weighing the screened needle-shaped pea gravel to obtain an actual weight.

[0068] S5. Calculate the actual content of the needle-like pea gravel by calculating the ratio of the actual weight to the initial weight.

[0069] According to relevant specifications, needle-like pea gravel is identified, and the needle-like pea gravel in the aggregate is selected and weighed. The weight is recorded as m (g). Formula 2 is used to calculate the content of needle-like pea gravel:

[0070]

[0071] Among them, σ is the actual content of needle-like pea gravel; m is the weight of needle-like pea gravel; M is the total weight of aggregate.

[0072] The beneficial effects of the present invention are as follows:

[0073] The present invention is based on image processing technology, and measures the front and back, left and right, and top and bottom directions of the measured pea gravel. It can measure the sizes of more pea gravels more conveniently and quickly, and obtain the same size data multiple times, and take the average value of the same size data to obtain a more accurate actual size, avoiding the error problems caused by material, shooting, light, etc. The method can simply and effectively measure the size of pea gravel and determine the content of needle-shaped pea gravel, and provides a more convenient, fast and accurate method for aggregate evaluation through simple spatial measurement.

[0074] System Example

[0075] According to an embodiment of the present invention, a system for determining the content of needle-shaped pea gravel based on image processing is provided. Figure 5A schematic diagram of a needle-shaped pea gravel content determination system based on image processing provided in one or more embodiments of this specification, such as Figure 5 As shown, the needle-shaped pea gravel content determination system based on image processing according to an embodiment of the present invention specifically includes:

[0076] The first weighing module 50 is used to obtain a number of pea gravels, wash and dry the obtained pea gravels, weigh them, and record the initial weight of the pea gravels;

[0077] Image acquisition module 52: used to place the processed pea gravel on a glass plate spliced ​​into a step shape, project the pea gravel on the glass plate in three different directions, use an industrial camera to respectively shoot the projections in the three different directions, and collect projection images;

[0078] Size measurement module 54: used for importing the collected projection image into the image analysis software for image analysis to obtain the measured size of the pea gravel in the projection image;

[0079] The second weighing module 56 is used to screen the size of the pea gravel based on a preset size threshold, select the needle-shaped pea gravel and weigh the screened needle-shaped pea gravel to obtain the actual weight;

[0080] The content calculation module 58 is used to obtain the actual content of the needle-like pea gravel by calculating the ratio of the actual weight to the initial weight.

[0081] The embodiment of the present invention is a system embodiment corresponding to the above-mentioned method embodiment. The specific operations of each module can be understood by referring to the description of the method embodiment, which will not be repeated here.

[0082] Device Example 1

[0083] An embodiment of the present invention provides an electronic device, such as Figure 6 As shown, it includes: a memory 60, a processor 62, and a computer program stored in the memory 60 and executable on the processor 62. When the computer program is executed by the processor 62, the following method steps are implemented:

[0084] S1. Obtain some pea gravel, wash and dry the obtained pea gravel, weigh it, and record the initial weight of the pea gravel;

[0085] S2, placing the processed pea gravel on a glass plate spliced ​​into a step shape, projecting the pea gravel on the glass plate in three different directions, using an industrial camera to respectively photograph the projections in the three different directions, and collecting projection images;

[0086] S3, importing the collected projection image into image analysis software for image analysis to obtain the measured size of the pea gravel in the projection image;

[0087] S4, screening the size of the pea gravel based on a preset size threshold, selecting the needle-shaped pea gravel and weighing the screened needle-shaped pea gravel to obtain an actual weight;

[0088] S5. Calculate the actual content of the needle-like pea gravel by calculating the ratio of the actual weight to the initial weight.

[0089] Device Example 2

[0090] An embodiment of the present invention provides a computer-readable storage medium, on which a program for implementing information transmission is stored. When the program is executed by the processor 62, the following method steps are implemented:

[0091] S1. Obtain some pea gravel, wash and dry the obtained pea gravel, weigh it, and record the initial weight of the pea gravel;

[0092] S2, placing the processed pea gravel on a glass plate spliced ​​into a step shape, projecting the pea gravel on the glass plate in three different directions, using an industrial camera to respectively photograph the projections in the three different directions, and collecting projection images;

[0093] S3, importing the collected projection image into image analysis software for image analysis to obtain the measured size of the pea gravel in the projection image;

[0094] S4, screening the size of the pea gravel based on a preset size threshold, selecting the needle-shaped pea gravel and weighing the screened needle-shaped pea gravel to obtain an actual weight;

[0095] S5. Calculate the actual content of the needle-like pea gravel by calculating the ratio of the actual weight to the initial weight.

[0096] The computer-readable storage medium in this embodiment includes, but is not limited to, ROM, RAM, magnetic disk or optical disk, etc.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for determining the content of needle-like pea gravel based on image processing, characterized in that: include: S1. Obtain some pea gravel, wash and dry the obtained pea gravel, weigh it, and record the initial weight of the pea gravel; S2, placing the processed pea gravel on a glass plate spliced ​​into a step shape, projecting the pea gravel on the glass plate in three different directions, using an industrial camera to respectively photograph the projections in the three different directions, and collecting projection images; S3, importing the collected projection image into image analysis software for image analysis to obtain the measured size of the pea gravel in the projection image; S4, screening the size of the pea gravel based on a preset size threshold, selecting the needle-shaped pea gravel and weighing the screened needle-shaped pea gravel to obtain an actual weight; S5. Calculate the actual content of the needle-like pea gravel by calculating the ratio of the actual weight to the initial weight.

2. The method according to claim 1, characterized in that The specific method of obtaining a number of pea gravels, washing and drying the obtained pea gravels, weighing them and recording the initial weight of the pea gravels is as follows: Randomly obtain a number of pea gravels, place the pea gravels in clean water to wash, and take them out after soaking for 30 minutes; Place the soaked pea gravel in an oven at 105 degrees Celsius for drying and take it out after 1 hour; Weigh the dried pea gravel to obtain the total weight of the pea gravel; Repeat the above drying process several times until the total weight changes within the specified range, and record the total weight at this time as the initial weight.

3. The method according to claim 1, characterized in that The method for preparing the stepped glass plate is specifically as follows: Select a glass plate with a length and width of 1.5 times the maximum size of the obtained pea gravel, isotropic, small and uniform thickness, and two parallel sides, bond the glass plate in a step shape, and outline the glass plate; For a vertical glass plate, the stroke lines around its plane coincide with the thickness stroke lines of the horizontal glass plate; Industrial glue is used to bond glass plates to construct a stepped glass frame, wherein the interior of the glass frame is hollowed out, leaving only one side with a stepped layer; Number each glass plate sequentially.

4. The method according to claim 3, characterized in that Project the pea gravel on the glass plate in three different directions, and use an industrial camera to take pictures of the projections in three different directions. The specific method for collecting the projection images is as follows: Place the screen on one side to facilitate shooting of the projection of the glass plate on the screen, place the parallel light plate on the other side of the glass plate, and place the industrial camera on the back of the screen; According to the number of horizontal glass plates, place the same number of bean gravels to be tested on the horizontal glass plates one by one, with only one bean gravel to be tested placed on each horizontal glass plate, and the bean gravels to be tested are placed in the center of the surface of the horizontal glass plate; The projections of the pea gravel and the edge lines of the glass plate on the screen are photographed by an industrial camera, so as to obtain three-view projection images of the glass plate and the multiple pea gravel placed thereon, wherein each square enclosed by the edge lines of the glass plate includes one pea gravel.

5. The method according to claim 4, characterized in that The size of the curtain is at least 1.5 times the size of the stepped glass frame, and the curtain is parallel to the corresponding glass plate surface; the size of the parallel light board is at least 1.5 times the size of the stepped glass frame, and the parallel light board is parallel to the corresponding glass plate surface and the curtain.

6. The method according to claim 5, characterized in that The method of photographing the projection of the pea gravel and the edge line of the glass plate on the screen by placing an industrial camera is as follows: The parallel light plates in different directions are opened and closed in turn, and the projection of the squares surrounded by the stroke lines on the screen is photographed in the directions of the three views.

7. The method according to claim 1, characterized in that The measurement size calculation method of the pea gravel is: For the same piece of pea gravel, in the three projection images in the three-view direction, the length of any square surrounded by the stroked line is selected as the reference size, and the size of all the squares surrounded by the stroked line and the measured size of the pea gravel to be measured are measured; The size of the pea gravel in each direction was measured by image analysis software, and the actual size of the pea gravel was obtained by taking the average value.

8. A needle-shaped pea gravel content determination system based on image processing, characterized in that: include: The first weighing module is used to obtain a number of pea gravels, wash and dry the obtained pea gravels, weigh them, and record the initial weight of the pea gravels; Image acquisition module: used to place the processed pea gravel on a glass plate spliced ​​into a step shape, project the pea gravel on the glass plate in three different directions, use an industrial camera to shoot the projections in the three different directions respectively, and collect the projection images; Size measurement module: used to import the collected projection image into the image analysis software for image analysis to obtain the measured size of the pea gravel in the projection image; The second weighing module is used to screen the size of the pea gravel based on a preset size threshold, select the needle-shaped pea gravel and weigh the screened needle-shaped pea gravel to obtain the actual weight; Content calculation module: used for obtaining the actual content of needle-shaped pea gravel by calculating the ratio of the actual weight to the initial weight.

9. An electronic device, characterized in that: include: processor; as well as, A memory arranged to store computer executable instructions, which, when executed, cause the processor to implement the steps of the method for determining the content of needle-like pea gravel based on image processing according to any one of claims 1 to 7.

10. A storage medium, characterized in that: Used to store computer executable instructions, which, when executed, implement the steps of the method for determining the content of needle-like pea gravel based on image processing as claimed in any one of claims 1 to 7.

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