CN116817772B - Aviation countersunk head fastener head height detection method, device and system - Google Patents
Aviation countersunk head fastener head height detection method, device and system Download PDFInfo
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Abstract
The invention discloses a method, a device and a system for detecting the head height of an aviation countersunk head fastener, wherein the method comprises the following steps: obtaining an image of the section of the head of the aviation countersunk head fastener to be measured, wherein the head of the aviation countersunk head fastener to be measured is placed on a locating pin of a measuring platform to acquire the image; searching a matching area from a template characteristic area of a template image of a preset standard workpiece serving as a reference; carrying out coordinate transformation on the matching region to obtain a transformed matching region; determining the edge of the target diameter area and the edge of the target angle area in the transformed matching area; and calculating the height of the head of the aviation countersunk head fastener to be tested according to the target diameter area edge and the target angle area edge. The invention has the advantages of high precision, automation, high speed and strong anti-interference capability, and meets the requirement of mass production and detection of aviation fasteners.
Description
Technical Field
The invention relates to the technical field of aviation fastener size measurement, in particular to a method, a device and a system for detecting the head height of an aviation countersunk head fastener.
Background
This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
The new generation of aircraft has strict requirements on the surface flatness of the aircraft body, and the surface assembly quality is directly related to the surface flatness during the assembly of the aircraft body. The bolts are common connecting parts, particularly the surface of an aircraft body, tens of thousands of bolts are distributed, the assembly quality of the bolts has an important influence on the surface evenness of the surface of the aircraft body, particularly the head height of the countersunk head bolts has an obvious influence on the assembly quality, the countersunk head bolts protrude out of the surface of the aircraft body, and the surface nest of the surface is exposed due to the too high head height. The control of the high qualification rate and consistency of the countersunk head bolt head is an important technical index for product manufacture and acceptance.
The height of the countersunk head bolt head generally refers to the H value marked on the bolt in fig. 1, and the transition part of the bolt polished rod and the countersunk head is in arc transition, so that the lower standard cannot be accurately selected, and the difference value between the lower standard and the head end face is further calculated to directly measure the H value. In the standard of bolt products, the head is usually fixed at a position D by curing 2 Dimension as reference, measure D 2 And the height P value from the end face of the bolt head is reached, so that the actual height H value of the bolt head is indirectly judged. As shown in fig. 2, a measuring method given in the conventional bolt product standard adopts a special gauge and a clamping plate, wherein the measuring process is that firstly, a countersunk bolt is placed in a gauge sleeve, then the countersunk bolt and the gauge sleeve are placed between the clamping plate together, if the through end of the clamping plate passes and the stop end does not pass, the head height of the countersunk bolt is judged to be qualified, otherwise, the countersunk bolt head height is judged to be unqualified.
The above measurement method has the following problems:
firstly, the machining precision requirement on the measuring tool gauge sleeve is extremely high, the machining difficulty is extremely high, and the yield is extremely low; secondly, the clamping plate and the fastening piece are in contact sliding friction contact, abrasion is serious in use, the clamping plate is not easy to find out, and the product misjudgment is easily caused by the fact that the clamping plate is out of tolerance; thirdly, the influence of human factors of operators is great, and different people can generate different conclusions when detecting.
And a simple, accurate and efficient aviation countersunk head fastener head height monitoring scheme is lacking at present.
Disclosure of Invention
The embodiment of the invention provides a method for detecting the head height of an aviation countersunk head fastener, which has the advantages of high precision, automation, high speed and strong anti-interference capability, and meets the detection requirement of mass production of aviation fasteners, and the method comprises the following steps:
obtaining an image of the section of the head of the aviation countersunk head fastener to be measured, wherein the head of the aviation countersunk head fastener to be measured is placed on a locating pin of a measuring platform to acquire the image;
searching a matching area from a template characteristic area of a template image of a preset standard workpiece serving as a reference;
carrying out coordinate transformation on the matching region to obtain a transformed matching region;
determining the edge of the target diameter area and the edge of the target angle area in the transformed matching area;
and calculating the height of the head of the aviation countersunk head fastener to be tested according to the target diameter area edge and the target angle area edge.
The embodiment of the invention also provides a device for detecting the head height of the aviation countersunk head fastener, which has the advantages of high precision, automation, high speed and strong anti-interference capability, and meets the detection requirement of mass production of aviation fasteners, and the device comprises:
the image acquisition module is used for acquiring an image of the section of the head of the aviation countersunk head fastener to be detected, and the head of the aviation countersunk head fastener to be detected is placed on a locating pin of the measuring platform to acquire the image;
the matching region searching module is used for searching a matching region from the image by taking a template characteristic region of a template image of a preset standard workpiece as a reference;
the coordinate transformation module is used for carrying out coordinate transformation on the matching region to obtain a transformed matching region;
the target determining module is used for determining a target diameter region edge and a target angle region edge in the transformed matching region;
and the height calculation module is used for calculating the height of the head of the aviation countersunk head fastener to be measured according to the target diameter area edge and the target angle area edge.
The embodiment of the invention also provides a head height detection system of the aviation countersunk head fastener, which has the advantages of high precision, automation, high speed and strong anti-interference capability, and meets the detection requirement of mass production of aviation fasteners, and the system comprises: an aviation countersunk head fastener head height detection device and an image acquisition device, wherein,
the image acquisition device is used for acquiring an image of the head section of the aviation countersunk head fastener to be detected and sending the image to the head height detection device of the aviation countersunk head fastener.
The embodiment of the invention also provides computer equipment, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the method for detecting the head height of the aviation countersunk head fastener when executing the computer program.
The embodiment of the invention also provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program realizes the aviation countersunk head fastener head height detection method when being executed by a processor.
Embodiments of the present invention also provide a computer program product comprising a computer program which, when executed by a processor, implements the above-described method of aviation countersunk head fastener head height detection.
In the embodiment of the invention, an image of the section of the head of the aviation countersunk head fastener to be detected is obtained, and the head of the aviation countersunk head fastener to be detected is placed on a locating pin of a measuring platform for image acquisition; searching a matching area from a template characteristic area of a template image of a preset standard workpiece serving as a reference; carrying out coordinate transformation on the matching region to obtain a transformed matching region; determining the edge of the target diameter area and the edge of the target angle area in the transformed matching area; and calculating the height of the head of the aviation countersunk head fastener to be tested according to the target diameter area edge and the target angle area edge. Compared with the technical scheme that a measuring tool gauge sleeve is adopted in the prior art, the method and the device have the advantages that the image of the section of the head of the aviation countersunk head fastener to be measured is collected, the template characteristic area of the template image of the preset standard workpiece is taken as a reference, the matching area is obtained, and finally the height of the head of the aviation countersunk head fastener to be measured can be calculated, so that the machine vision measurement is realized, human errors caused by manual vision can be avoided, and the anti-interference capability is high; the detection efficiency is high, high-efficient continuous detection and automatic detection of aviation countersunk head fastener head can be realized, and the detection precision is high.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is a schematic view of countersunk head portion height;
FIG. 2 is a schematic illustration of a measurement method given in the prior art bolt product standard;
FIG. 3 is a flow chart of a method of aircraft countersunk fastener head height detection in accordance with an embodiment of the present invention;
FIG. 4 is a schematic view of an airborne countersunk fastener head height sensing device, in accordance with an embodiment of the invention;
FIG. 5 is a schematic view of an airborne countersunk fastener head height detection system in accordance with an embodiment of the invention;
FIG. 6 is a schematic diagram of image acquisition in an embodiment of the present invention;
FIG. 7 is a schematic view of a locating pin placed on a measurement platform according to an embodiment of the present invention;
FIG. 8 is a template image of a preset master workpiece in an embodiment of the invention;
FIG. 9 is a diameter region edge of a template image in an embodiment of the invention;
FIG. 10 is an angular region edge of a template image in an embodiment of the invention;
FIG. 11 is a schematic diagram of a matching region in an embodiment of the present invention;
FIG. 12 is a schematic view of calculating the height of an aircraft countersunk fastener head to be tested in accordance with an embodiment of the present invention;
FIG. 13 is a schematic diagram of calibration with a preset proof mass in an embodiment of the present invention;
FIG. 14 is a schematic view of a 100 ° small countersunk head portion of a bolt according to an embodiment of the present invention;
fig. 15 is a schematic diagram of a computer device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings. The exemplary embodiments of the present invention and their descriptions herein are for the purpose of explaining the present invention, but are not to be construed as limiting the invention.
Fig. 3 is a flowchart of a method for detecting the head height of an aerial countersunk head fastener according to an embodiment of the present invention, corresponding to fig. 3, fig. 4 is a schematic diagram of a device for detecting the head height of an aerial countersunk head fastener according to an embodiment of the present invention, and fig. 5 is a schematic diagram of a system for detecting the head height of an aerial countersunk head fastener according to an embodiment of the present invention, referring to fig. 3, where the method for detecting the head height of an aerial countersunk head fastener includes:
step 301, obtaining an image of a section of a head of an aviation countersunk head fastener to be measured, wherein the head of the aviation countersunk head fastener to be measured is placed on a locating pin of a measuring platform for image acquisition;
step 302, searching a matching area from a template feature area of a template image of a preset standard workpiece serving as a reference;
step 303, performing coordinate transformation on the matching region to obtain a transformed matching region;
step 304, determining the edge of the target diameter area and the edge of the target angle area in the transformed matching area;
step 305, calculating the height of the head of the aviation countersunk head fastener to be tested according to the target diameter area edge and the target angle area edge.
Referring to fig. 4, the aviation countersunk head fastener head height detecting apparatus includes:
the image acquisition module 401 is used for acquiring an image of the section of the head of the aviation countersunk head fastener to be measured, and the head of the aviation countersunk head fastener to be measured is placed on a locating pin of the measuring platform for image acquisition;
a matching region searching module 402, configured to search a matching region from a template feature region of a template image of a preset standard workpiece, with the template feature region as a reference;
the coordinate transformation module 403 is configured to perform coordinate transformation on the matching region, so as to obtain a transformed matching region;
a target determining module 404, configured to determine a target diameter region edge and a target angle region edge in the transformed matching region;
and the height calculating module 405 is used for calculating the height of the head of the aviation countersunk head fastener to be measured according to the target diameter area edge and the target angle area edge.
Referring to fig. 5, an aerial countersunk head fastener head height detection system, comprising: an aviation countersunk head fastener head height detection device 501, an image acquisition device 502, in which,
the image acquisition device is used for acquiring an image of the head section of the aviation countersunk head fastener to be detected and sending the image to the head height detection device of the aviation countersunk head fastener.
In one embodiment, the image acquisition device comprises an illumination source and a camera;
the illumination light source is located on one side of the head of the aviation countersunk head fastener to be tested, and the camera is located on the other side of the head of the aviation countersunk head fastener to be tested.
Wherein the camera is provided with a lens, the lens is close to the head of the aviation countersunk head fastener to be measured, and fig. 6 is a schematic diagram of image acquisition in the embodiment of the invention, wherein the head of the aviation countersunk head fastener to be measured is placed on a positioning pin of the measuring platform.
Each step is described in detail below.
In step 301, obtaining an image of a cross section of a head of an aviation countersunk head fastener to be measured, wherein the head of the aviation countersunk head fastener to be measured is placed on a locating pin of a measuring platform for image acquisition; wherein the image acquisition device implements the step 301;
in one embodiment, the locating pin is matched to the diameter of the head of the aircraft countersunk fastener to be tested. That is, the locating pin can be replaced according to the diameter of the countersunk head.
FIG. 7 is a schematic view of a locating pin placed on a measuring platform to begin head height measurement according to an embodiment of the present invention. The measured value of the head height can be obtained by selecting single or multiple cross-sectional images, calculating, and averaging the calculated results. In fig. 7, the movable platform is a measurement platform, and can move according to a moving direction.
In step 302, searching a matching area from a template feature area of a template image of a preset standard workpiece serving as a reference;
in an embodiment, the method further comprises:
obtaining an image of at least one section of a preset standard workpiece serving as a template image, wherein the model of the preset standard workpiece is the same as that of the head of the aviation countersunk head fastener to be tested;
determining a template feature region of the template image;
and obtaining the diameter area edge and the angle area edge of the template image.
In the specific implementation, for the workpiece with the current model to be detected, a template for measurement learning is firstly required to be established. Before the template is established, a workpiece which meets the standard and is to be measured is selected as a preset standard workpiece, and the surface to be measured and the placement bottom surface need to be cleaned without burrs.
And placing a preset standard workpiece serving as a template on a workbench, and shooting an image. And setting a template characteristic region of the photographed template image.
The template feature area is selected by firstly selecting a workpiece local feature area on the current workpiece template as a positioning mark, and recording the coordinate position of the template area.
And then, searching the position of the region with the highest matching degree with the template characteristic region on the shot image, and determining the coordinate position of the matching region in the field of view, so as to obtain the coordinate change of the currently measured workpiece relative to the template image on the field of view, wherein the workpiece can be found no matter which position of the field of view of the camera, and the coordinates and the angles are provided. And then positioning the measurement area with all dimensions according to a preset measurement scheme based on the coordinate change.
Fig. 8 is a template image of a preset standard workpiece in an embodiment of the invention, wherein the boxes in fig. 8 are circled as template feature regions. Fig. 9 is a diameter region edge of a template image in an embodiment of the invention, wherein the boxes in fig. 9 are circled diameter region edges. FIG. 10 illustrates the angular region edges of a template image in accordance with an embodiment of the present invention, wherein the boxes in FIG. 10 are circled angular region edges.
Wherein the diameter region edge is defined on the template image, and the angle region edge is the region of the feature edge to be searched. Fastener head height is defined as the distance from the intersection of the stem diameter and the angular face to the bottom surface. Therefore, the head height measurement region of the template image needs to determine the diameter region and the angle region of the head.
And taking the template characteristic region of a template image of a preset standard workpiece as a reference, and taking the region with the highest matching degree with the template characteristic region as a matching region when searching the matching region from the image.
In step 303, performing coordinate transformation on the matching region to obtain a transformed matching region;
in an embodiment, performing coordinate transformation on the matching region to obtain a transformed matching region, including:
calculating the center coordinates and the rotation angles of the matching areas;
and carrying out coordinate conversion on the diameter region and the angle region in the matching region according to the central coordinates and the rotation angle to obtain a converted matching region, wherein the converted matching region comprises a converted diameter region and a converted angle region.
FIG. 11 is a schematic view of the matching area of an embodiment of the present invention, the matching area being identified in FIG. 11 as the location of the template feature area in the field of view, and the image of the cross section of the head of the airborne blind fastener being tested. The image of the cross-section of the head of the aerial countersunk fastener to be tested in this example is offset downwardly relative to the template image.
When the coordinate transformation is carried out, the diameter area and the angle area in the matching area are corresponding to the template area, so that the transformed matching area is changed along with the position movement of the workpiece to be measured.
In step 304, in the transformed matching region, determining a target diameter region edge and a target angle region edge;
in one embodiment, determining the target diameter region edge and the target angle region edge in the transformed matching region includes:
searching the edge of the diameter area of the head part of the aviation countersunk head fastener to be detected in the transformed diameter area;
searching the edge of the angle area of the head part of the aviation countersunk head fastener to be detected in the transformed angle area;
performing straight line fitting on the diameter region edge and the diameter region edge of the template characteristic region to obtain a target diameter region edge;
and performing straight line fitting on the edge of the countersunk head region and the edge of the angle region of the template characteristic region to obtain the edge of the target angle region.
In step 305, the height of the head of the aerial countersunk fastener to be tested is calculated from the target diameter area edge and the target angle area edge.
In one embodiment, calculating the height of the head of the aerial countersunk fastener to be measured from the target diameter area edge and the target angle area edge comprises:
calculating two intersection points of the edge of the target diameter area and the edge of the target angle area;
calculating the vertical distance between the two intersection points and the bottom surface of the positioning pin respectively;
and determining the average value of the two vertical distances as the height of the head of the aviation countersunk head fastener to be tested.
FIG. 12 is a schematic view of the calculation of the height of the head of an aerospace countersunk fastener to be tested, in accordance with an embodiment of the present invention, using the locating pin bottom surface, i.e., the bottom surface datum line of FIG. 12, in the above steps. The positioning surface for placing the workpiece is defined as a bottom surface, and is actually the upper surface of the positioning pin, and the diameter difference of the excircles of the workpieces of different types is large, so that the positioning pin with the corresponding diameter range needs to be replaced after the diameter range is exceeded. Because a certain flatness deviation exists after the positioning pin is installed positively, the deviation can lead to a certain relative inclination between the workpiece and the measuring view field of the camera after the workpiece is positioned on the pin, and the measurement deviation of the height dimension can be caused. Therefore, if the product with high requirement for measuring the height dimension is used, after the locating pin is replaced each time, a workpiece with the calibrated height dimension or a 0-level length gauge block can be used as a preset standard gauge block to be placed on the bottom surface of the locating pin for calibration, and after the measured value is ensured to be consistent with the calibration value through an algorithm, batch measurement is carried out. FIG. 13 is a schematic diagram of calibration with a predetermined proof mass in an embodiment of the invention.
In an embodiment, the method further comprises:
calibrating the bottom surface of the positioning pin through a preset standard gauge block;
calculating the vertical distance between the two intersection points and the bottom surface of the locating pin respectively comprises the following steps:
and calculating the vertical distance between the two intersection points and the bottom surface of the calibrated positioning pin.
In one embodiment, the coordinate transformation module is specifically configured to:
calculating the center coordinates and the rotation angles of the matching areas;
and carrying out coordinate conversion on the diameter region and the angle region in the matching region according to the central coordinates and the rotation angle to obtain a converted matching region, wherein the converted matching region comprises a converted diameter region and a converted angle region.
In one embodiment, the targeting module is specifically configured to:
searching the edge of the diameter area of the head part of the aviation countersunk head fastener to be detected in the transformed diameter area;
searching the edge of the angle area of the head part of the aviation countersunk head fastener to be detected in the transformed angle area;
performing straight line fitting on the diameter region edge and the diameter region edge of the template characteristic region to obtain a target diameter region edge;
and performing straight line fitting on the edge of the countersunk head region and the edge of the angle region of the template characteristic region to obtain the edge of the target angle region.
In one embodiment, the height calculation module is specifically configured to:
calculating two intersection points of the edge of the target diameter area and the edge of the target angle area;
calculating the vertical distance between the two intersection points and the bottom surface of the positioning pin respectively;
and determining the average value of the two vertical distances as the height of the head of the aviation countersunk head fastener to be tested.
In an embodiment, the apparatus further comprises a calibration module for:
calibrating the bottom surface of the positioning pin through a preset standard gauge block;
the height calculation module is specifically used for:
and calculating the vertical distance between the two intersection points and the bottom surface of the calibrated positioning pin.
In an embodiment, the apparatus further comprises a template obtaining module for:
obtaining an image of at least one section of a preset standard workpiece serving as a template image, wherein the model of the preset standard workpiece is the same as that of the head of the aviation countersunk head fastener to be tested;
determining a template feature region of the template image;
and obtaining the diameter area edge and the angle area edge of the template image.
A specific example is given below.
Taking the head of the aviation countersunk head fastener to be tested as the head of the 100-degree small countersunk head bolt as an example, fig. 14 is a schematic diagram of the head of the 100-degree small countersunk head bolt in the embodiment of the invention, firstly, positioning a bottom surface datum line by using a preset standard block, establishing a template image, selecting a template characteristic region, storing the template image, defining and fitting the edge of a linear region and the edge of an angle region on the template image, storing the edge, placing the head of the 100-degree small countersunk head bolt to be tested on a platform, and shooting the image.
Template matching is carried out on the shot image, a matching area is found, coordinate conversion is carried out, and the matching area after conversion is carried out; in the transformed matching region, a target diameter region edge and a target angle region edge are determined. Calculating two intersection points of the edge of the target diameter area and the edge of the target angle area; calculating the vertical distance between the two intersection points and the bottom surface of the positioning pin respectively; and determining the average value of the two vertical distances as the height of the head of the aviation countersunk head fastener to be tested.
In summary, the method, the device and the system provided by the embodiment of the invention have the following beneficial effects:
first, measurement accuracy is high, and for solid of revolution parts, measurement accuracy of generating line part (screw diameter projection and countersunk angle projection) can reach + -1.5 um.
Secondly, the machine vision measurement is adopted, so that human errors caused by artificial vision can be avoided, and the anti-interference capability is high.
Thirdly, detection efficiency is high, and high-efficient continuous detection of aviation countersunk head fastener head can be realized.
Fourth, automated detection may be achieved.
An embodiment of the present invention further provides a computer device, and fig. 15 is a schematic diagram of the computer device in the embodiment of the present invention, where the computer device 1500 includes a memory 1510, a processor 1520, and a computer program 1530 stored in the memory 1510 and capable of running on the processor 1520, and the method for detecting the head height of the airborne countersunk head fastener is implemented by the processor 1520 when the processor 1520 executes the computer program 1530.
The embodiment of the invention also provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program realizes the aviation countersunk head fastener head height detection method when being executed by a processor.
Embodiments of the present invention also provide a computer program product comprising a computer program which, when executed by a processor, implements the above-described method of aviation countersunk head fastener head height detection.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (9)
1. An aircraft countersunk head fastener head height detection method, comprising:
obtaining an image of the section of the head of the aviation countersunk head fastener to be measured, wherein the head of the aviation countersunk head fastener to be measured is placed on a locating pin of a measuring platform to acquire the image; the head of the aviation countersunk head fastener is funnel-shaped, the funnel-shaped comprises a top surface, a bottom surface and an angle surface, the angle surface is arc-shaped, the top surface and the bottom surface are planes, the diameter of the bottom surface is larger than that of the top surface, the top surface and the bolt polish rod are in arc transition, and the height of the head of the fastener is defined as the distance from the intersection point of the bolt polish rod and the angle surface to the bottom surface;
searching a matching area from a template characteristic area of a template image of a preset standard workpiece serving as a reference;
carrying out coordinate transformation on the matching region to obtain a transformed matching region;
determining the edge of the target diameter area and the edge of the target angle area in the transformed matching area;
calculating the height of the head of the aviation countersunk head fastener to be tested according to the edge of the target diameter area and the edge of the target angle area;
performing coordinate transformation on the matching region to obtain a transformed matching region, including: calculating the center coordinates and the rotation angles of the matching areas; according to the center coordinates and the rotation angles, carrying out coordinate conversion on the diameter area and the angle area in the matching area to obtain a converted matching area, wherein the converted matching area comprises a converted diameter area and a converted angle area;
when the coordinate transformation is carried out, the diameter area and the angle area in the matching area are corresponding to the template area, so that the transformed matching area is changed along with the position movement of the workpiece to be detected;
according to the target diameter area edge and the target angle area edge, calculating the height of the head of the aviation countersunk head fastener to be measured, including: calculating two intersection points of the edge of the target diameter area and the edge of the target angle area; calculating the vertical distance between the two intersection points and the bottom surface of the positioning pin respectively; and determining the average value of the two vertical distances as the height of the head of the aviation countersunk head fastener to be tested.
2. The method of claim 1, wherein determining the target diameter region edge and the target angle region edge in the transformed matching region comprises:
searching the edge of the diameter area of the head part of the aviation countersunk head fastener to be detected in the transformed diameter area;
searching the edge of the angle area of the head part of the aviation countersunk head fastener to be detected in the transformed angle area;
performing straight line fitting on the diameter region edge and the diameter region edge of the template characteristic region to obtain a target diameter region edge;
and performing straight line fitting on the angle region edge and the angle region edge of the template characteristic region to obtain a target angle region edge.
3. The method as recited in claim 1, further comprising:
calibrating the bottom surface of the positioning pin through a preset standard gauge block;
calculating the vertical distance between the two intersection points and the bottom surface of the locating pin respectively comprises the following steps:
and calculating the vertical distance between the two intersection points and the bottom surface of the calibrated positioning pin.
4. The method as recited in claim 1, further comprising:
obtaining an image of at least one section of a preset standard workpiece serving as a template image, wherein the model of the preset standard workpiece is the same as that of the head of the aviation countersunk head fastener to be tested;
determining a template feature region of the template image;
and obtaining the diameter area edge and the angle area edge of the template image.
5. The method of claim 1, wherein the dowel pin is matched to the diameter of the head of the aerospace countersunk head fastener to be tested.
6. An aviation countersunk head fastener head height detection device, comprising:
the image acquisition module is used for acquiring an image of the section of the head of the aviation countersunk head fastener to be detected, and the head of the aviation countersunk head fastener to be detected is placed on a locating pin of the measuring platform to acquire the image; the head of the aviation countersunk head fastener is funnel-shaped, the funnel-shaped comprises a top surface, a bottom surface and an angle surface, the angle surface is arc-shaped, the top surface and the bottom surface are planes, the diameter of the bottom surface is larger than that of the top surface, the top surface and the bolt polish rod are in arc transition, and the height of the head of the fastener is defined as the distance from the intersection point of the bolt polish rod and the angle surface to the bottom surface;
the matching region searching module is used for searching a matching region from the image by taking a template characteristic region of a template image of a preset standard workpiece as a reference;
the coordinate transformation module is used for carrying out coordinate transformation on the matching region to obtain a transformed matching region;
the target determining module is used for determining a target diameter region edge and a target angle region edge in the transformed matching region;
the height calculation module is used for calculating the height of the head of the aviation countersunk head fastener to be measured according to the edge of the target diameter area and the edge of the target angle area;
performing coordinate transformation on the matching region to obtain a transformed matching region, including: calculating the center coordinates and the rotation angles of the matching areas; according to the center coordinates and the rotation angles, carrying out coordinate conversion on the diameter area and the angle area in the matching area to obtain a converted matching area, wherein the converted matching area comprises a converted diameter area and a converted angle area;
when the coordinate transformation is carried out, the diameter area and the angle area in the matching area are corresponding to the template area, so that the transformed matching area is changed along with the position movement of the workpiece to be detected;
according to the target diameter area edge and the target angle area edge, calculating the height of the head of the aviation countersunk head fastener to be measured, including: calculating two intersection points of the edge of the target diameter area and the edge of the target angle area; calculating the vertical distance between the two intersection points and the bottom surface of the positioning pin respectively; and determining the average value of the two vertical distances as the height of the head of the aviation countersunk head fastener to be tested.
7. An aircraft countersunk fastener head height detection system, comprising: the aerial countersunk head fastener head height detecting apparatus, image acquisition apparatus of claim 6, wherein,
the image acquisition device is used for acquiring an image of the head section of the aviation countersunk head fastener to be detected and sending the image to the head height detection device of the aviation countersunk head fastener.
8. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method of any of claims 1 to 5 when executing the computer program.
9. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program which, when executed by a processor, implements the method of any of claims 1 to 5.
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