CN116359131A - Calibration method of pole piece defect detection system and pole piece defect detection system - Google Patents
Calibration method of pole piece defect detection system and pole piece defect detection system Download PDFInfo
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 6
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Abstract
The application discloses a calibration method of a pole piece defect detection system and the pole piece defect detection system, and belongs to the technical field of visual detection. The system comprises a light source, an image acquisition device and a pole piece conveying mechanism, and the method comprises the following steps: acquiring a feeding angle of the pole piece transmitted by the pole piece transmission mechanism; based on the feeding angle, adjusting the mounting pose of the light source so that the light emitting surface of the light source is perpendicular to the plane where the pole piece is positioned; acquiring a first target image of the light source through the image acquisition device; adjusting the mounting pose of the image acquisition device based on the pixel information of the first target point in the first target image; acquiring a second target image of the pole piece transmitted by the pole piece transmitting mechanism through the image acquisition device; and adjusting imaging parameters of the image acquisition device based on the second target image. The method can effectively prevent calibration failure and improve detection precision.
Description
Technical Field
The application belongs to the technical field of visual detection, and particularly relates to a calibration method of a pole piece defect detection system and the pole piece defect detection system.
Background
After the lithium battery pole piece is coated and rolled, the electrode lug shape is cut by a die cutting machine, the next process can be performed, and when the lithium battery pole piece is cut by the die cutting machine, pinhole detection and dimensional accuracy detection are required to be performed on the lithium battery pole piece.
In the related art, the pole piece material is directly calibrated under the backlight station, calibration fails after materials of other types are replaced, and after the calibration of the materials is completed, if the pole pieces of the same type are subjected to left-right offset during feeding, the calibration fails as well, so that the measurement data of the pole piece size are inaccurate, errors are easy to occur in the manual debugging process, and a large-range measurement precision deviation occurs in subsequent detection.
Disclosure of Invention
The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the calibration method of the pole piece defect detection system and the pole piece defect detection system are provided, calibration failure can be effectively prevented, and detection accuracy is improved.
In a first aspect, the present application provides a calibration method of a pole piece defect detection system, the pole piece defect detection system includes a light source, an image acquisition device and a pole piece conveying mechanism, the pole piece conveying mechanism is used for conveying a pole piece, the light source is located on a first face of the pole piece, the image acquisition device is located on a second face of the pole piece, and the calibration method of the pole piece defect detection system includes:
Acquiring a feeding angle of the pole piece transmitted by the pole piece transmission mechanism;
based on the feeding angle, adjusting the mounting pose of the light source so that the light emitting surface of the light source is perpendicular to the plane where the pole piece is positioned;
acquiring a first target image of the light source through the image acquisition device, wherein the light source is provided with a first target point;
adjusting the mounting pose of the image acquisition device based on the pixel information of the first target point in the first target image;
acquiring a second target image of the pole piece transmitted by the pole piece transmitting mechanism through the image acquisition device;
and adjusting imaging parameters of the image acquisition device based on the second target image.
According to the calibration method of the pole piece defect detection system, the imaging parameters of the image acquisition device are adjusted by adjusting the relative pose between the light source and the image acquisition device, the calibration process of the pole piece defect detection system is standardized, the calibration cannot be invalid under the condition of replacing pole piece materials, and the detection precision of the pole piece defect detection system is high.
According to an embodiment of the application, the pole piece conveying mechanism further comprises a smoothing component, the smoothing component comprises two clamping arms, the pole piece and the inner surface of one of the two clamping arms are in the same plane, a transparent substrate is clamped between the two clamping arms, the transparent substrate is located on the second face of the pole piece, a second target point is arranged on the transparent substrate, and the second target image comprises pixel information of the second target point.
According to an embodiment of the present application, the pixel information of the second target point includes transition pixel information, and the adjusting the imaging parameter of the image capturing device based on the second target image includes:
and adjusting imaging parameters of the image acquisition device under the condition that the transition pixel information in the second target image is determined to be larger than a pixel threshold value.
According to an embodiment of the present application, the pixel information of the second target point includes pole piece dimensional accuracy information, and the adjusting the imaging parameter of the image acquisition device based on the second target image includes:
and adjusting imaging parameters of the image acquisition device under the condition that the size precision information of the pole piece in the second target image is larger than a size precision threshold value.
According to an embodiment of the present application, the first target includes a first target and two second targets, the first target is located at the center of the light source, the two second targets are located at two opposite sides of the light source, the adjusting the mounting pose of the image capturing device based on the pixel information of the first target in the first target image includes:
And adjusting the mounting pose of the image acquisition device based on the pixel information of the first target point and the two second target points in the first target image so that the pixel information of the first target point is positioned at the center position of the first target image, and the pixel information of the two second target points is positioned at the opposite edge positions of the first target image.
In a second aspect, the present application provides a pole piece defect detection system, comprising: the device comprises a light source, an image acquisition device and a pole piece conveying mechanism, wherein the pole piece conveying mechanism is used for conveying a pole piece, the light source is positioned on a first surface of the pole piece, and the image acquisition device is positioned on a second surface of the pole piece;
the controller is electrically connected with the light source, the image acquisition device and the pole piece conveying mechanism, and the controller calibrates the pole piece defect detection system based on the calibration method of the pole piece defect detection system.
According to the pole piece defect detection system, the imaging parameters of the image acquisition device are adjusted by adjusting the relative pose between the light source and the image acquisition device, the calibration process of the pole piece defect detection system is standardized, and the calibration cannot be invalid under the condition of replacing the pole piece material, so that the detection precision of the pole piece defect detection system is high.
In a third aspect, the present application provides a calibration device of a pole piece defect detection system, the pole piece defect detection system includes a light source, an image acquisition device and a pole piece conveying mechanism, the pole piece conveying mechanism is used for conveying a pole piece, the light source is located the first face of the pole piece, the image acquisition device is located the second face of the pole piece, the calibration device of the pole piece defect detection system includes:
the first acquisition module is used for acquiring the feeding angle of the pole piece transmitted by the pole piece transmission mechanism;
the first processing module is used for adjusting the mounting pose of the light source based on the feeding angle so that the light emitting surface of the light source is perpendicular to the plane where the pole piece is located;
the second acquisition module is used for acquiring a first target image of the light source through the image acquisition device, and the light source is provided with a first target point;
the second processing module is used for adjusting the installation pose of the image acquisition device based on the pixel information of the first target point in the first target image;
the third acquisition module is used for acquiring a second target image of the pole piece transmitted by the pole piece transmission mechanism through the image acquisition device;
And the third processing module is used for adjusting imaging parameters of the image acquisition device based on the second target image.
According to the calibration device of the pole piece defect detection system, through adjusting the relative pose between the light source and the image acquisition device, the imaging parameters of the image acquisition device are adjusted, the calibration process of the pole piece defect detection system is standardized, the calibration cannot be invalid under the condition of replacing pole piece materials, and the detection precision of the pole piece defect detection system is high.
In a fourth aspect, the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the processor implements the calibration method of the pole piece defect detection system according to the first aspect when executing the computer program.
In a fifth aspect, the present application provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method for calibrating a pole piece defect detection system as described in the first aspect above.
In a sixth aspect, the present application provides a computer program product comprising a computer program which, when executed by a processor, implements a method for calibrating a pole piece defect detection system as described in the first aspect above.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
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The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, wherein:
FIG. 1 is one of the flow charts of the calibration method of the pole piece defect detection system provided in the embodiments of the present application;
FIG. 2 is a schematic diagram of a backlight station according to an embodiment of the present disclosure;
FIG. 3 is a second flow chart of a calibration method of the pole piece defect detection system according to the embodiment of the present application;
fig. 4 is a schematic structural diagram of a pole piece conveying mechanism according to an embodiment of the present disclosure;
FIG. 5 is a second schematic structural view of a pole piece conveying mechanism according to an embodiment of the present disclosure;
FIG. 6 is a schematic structural view of a smoothing mechanism provided in an embodiment of the present application;
fig. 7 is a schematic structural diagram of a pole piece defect detecting device according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Reference numerals:
Detailed Description
Technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application are within the scope of the protection of the present application.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type and not limited to the number of objects, e.g., the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
The detailed description of the method for calibrating the pole piece defect detection system, the calibrating device of the pole piece defect detection system, the electronic device and the readable storage medium provided by the embodiment of the application is given below with reference to fig. 1 to 8 through specific embodiments and application scenes thereof.
The calibration method of the pole piece defect detection system can be applied to a terminal, and can be specifically executed by hardware or software in the terminal.
The terminal includes, but is not limited to, a portable communication device such as a mobile phone or tablet having a touch sensitive surface (e.g., a touch screen display and/or a touch pad). It should also be appreciated that in some embodiments, the terminal may not be a portable communication device, but rather a desktop computer having a touch-sensitive surface (e.g., a touch screen display and/or a touch pad).
In the following various embodiments, a terminal including a display and a touch sensitive surface is described. However, it should be understood that the terminal may include one or more other physical user interface devices such as a physical keyboard, mouse, and joystick.
The execution main body of the calibration method of the pole piece defect detection system provided by the embodiment of the application may be an electronic device or a functional module or a functional entity in the electronic device, where the electronic device includes, but is not limited to, a mobile phone, a tablet computer, a camera, a wearable device, and the like, and the calibration method of the pole piece defect detection system provided by the embodiment of the application is described below by taking the electronic device as an execution main body as an example.
In this embodiment, the pole piece defect detection system includes a light source 220, an image acquisition device 230 and a pole piece conveying mechanism, the pole piece conveying mechanism is used for conveying a pole piece 210, the light source 220 is located on a first face of the pole piece 210, and the image acquisition device 230 is located on a second face of the pole piece 210.
The kinds of the light source 220 may include various kinds, and for example, an LED lamp, an incandescent lamp, a fluorescent lamp, or the like may be used as the light source 220.
The image capturing device 230 may be a different kind of industrial camera, for example, the image capturing device 230 may be a CCD (Charge Coupled Device) industrial camera or a CMOS (Complementary Metal Oxide Semiconductor) industrial camera.
Compared with civil cameras, industrial cameras have higher image stability, high transmission capacity and high anti-interference capacity.
As shown in fig. 2, the light source 220 is located on a first surface of the pole piece 210, the image acquisition device 230 is located on a second surface of the pole piece 210, the light source 220 and the image acquisition device 230 are respectively located on two surfaces of the pole piece 210, the pole piece 210 is opaque, the light emitting surface of the light source 220 faces the image acquisition device 230, and the image acquisition device 230 acquires the image of the pole piece 210
As shown in fig. 1, the calibration method of the pole piece defect detection system includes steps 110 to 160.
Wherein, the feeding angle of the pole piece 210 refers to an included angle between a feeding plane of the pole piece 210 and a horizontal plane when the pole piece 210 moves along the pole piece conveying mechanism.
In some embodiments, the pole piece conveying mechanism may include a conveying belt, the pole piece 210 moves on the conveying belt, a plane where the conveying belt is located is a feeding plane, an included angle between the conveying belt and a horizontal plane is a feeding angle, and the feeding angle of the pole piece 210 may be determined according to an inclination angle of the conveying belt.
In other embodiments, the pole piece transport mechanism may include a guide roller assembly including at least two guide rollers for winding the pole piece 210.
For example, the guide roller assembly may include a first guide roller 241 and a second guide roller 242, and the movement of the pole piece 210 in different directions about the guide roller assembly may be at least one of the following.
In the first feeding situation, as shown in fig. 4, the pole piece 210 is disposed at the same end of two guide rollers of the guide roller assembly, for example, the pole piece 210 is disposed at the upper ends of the two guide rollers. In this embodiment, the plane of the upper end connection line of the first guide roller 241 and the second guide roller 242 is the feeding plane of the pole piece 210, and the angle between the feeding plane and the horizontal plane can be measured by a measuring tool such as the angle ruler 320, that is, the feeding angle, and at this time, the measured angle is equal to the feeding angle.
In practical implementation, one of the guide rollers may be clamped by using the vernier caliper 310, and the gauge arm of the vernier caliper 310 is used as a feeding plane, so as to measure the feeding angle of the pole piece 210.
As shown in fig. 4, the vernier caliper 310 is clamped at the upper end of the first guide roller 241, the arm of the vernier caliper 310 is tightly attached to the upper end of the second guide roller 242, and the angle gauge 320 is placed on the arm of the vernier caliper 310 to measure the feeding angle of the pole piece 210.
It should be noted that, the precision of the angle ruler 320 may be 0.05 °, and the precision of the feeding angle may be 0.1 ° when measuring the feeding angle.
In the second feeding case, as shown in fig. 5, the pole piece 210 is disposed at different ends of two guide rollers of the guide roller assembly, for example, one end of the pole piece 210 is disposed at the upper end of the first guide roller 241, and the other end of the pole piece 210 is disposed at the lower end of the second guide roller 242.
In this embodiment, the plane where the upper end of the first guide roller 241 and the lower end of the second guide roller 242 are connected is the feeding plane of the pole piece 210, and the angle between the feeding plane and the horizontal plane is the feeding angle.
In practical implementation, one of the guide rollers may be clamped by using the vernier caliper 310, and the arm of the vernier caliper 310 is used as a feeding plane, at this time, the included angle between the plane of the vernier caliper 310 and the horizontal plane is a measurement angle, and the included angle between the plane of the vernier caliper 310 and the feeding plane is a calculation angle.
The included angle between the plane of the vernier caliper 310 and the horizontal plane can be obtained by measuring tools such as an angle gauge 320, and the like, namely the measured angle.
The diameter of the first guide roller 241 and the diameter of the second guide roller 242 and the maximum distance between the first guide roller 241 and the second guide roller 242 are obtained through the vernier caliper 310, and the included angle between the plane of the vernier caliper 310 and the feeding plane is obtained through a graphic simulation technology based on the diameter of the first guide roller 241 and the diameter of the second guide roller 242 and the maximum distance between the first guide roller 241 and the second guide roller 242, namely the calculated angle.
Wherein the feed angle is numerically equal to the measurement angle plus the calculated angle.
The installation pose of the light source 220 includes an installation position and an installation pose of the light source 220, and a plane where the pole piece 210 is located is a feeding plane.
In this step, after the light source 220 is disposed on the first surface of the pole piece 210, according to the feeding angle of the feeding plane and the horizontal plane of the pole piece 210, the installation position of the light source 220 relative to the pole piece 210 and the installation posture such as the pitching angle of the light source 220 for emitting light are adjusted, so that the light emitting surface of the light source 220 is perpendicular to the plane where the pole piece 210 is located, and the adjustment of the light source 220 in the pole piece defect detection system is completed.
The light source 220 is provided with a first target point, and the first target point is a colored pixel point for marking a certain position in the light source 220.
In practical implementations, the first target may be a pixel dot that is black and has a size less than 2mm by 2 mm.
In this embodiment, the first target point is disposed at a certain position of the light source 220, the light source 220 is photographed by the image capturing device 230, and a first target image of the light source 220 is obtained, and the first target image includes pixel information of the first target point.
The installation pose of the image capturing device 230 includes an installation position and an installation pose of the image capturing device 230 with respect to the light source 220.
In this step, the relative positional relationship between the image capturing device 230 and the light source 220 is determined according to the pixel information of the first target point in the first target image, and then the installation position and the installation posture of the image capturing device 230 relative to the light source 220 are adjusted accordingly according to the preset positional relationship.
For example, according to the pixel information of the first target point in the first target image, it is determined that the image capturing device 230 and the light source 220 are not facing to be set, and by adjusting the installation position and the installation posture of the image capturing device 230, the image capturing device 230 can reach the preset facing setting position.
In this embodiment, the pole piece 210 is disposed on the pole piece transfer mechanism, and the second target image of the pole piece 210 is acquired by photographing the pole piece 210 on the pole piece transfer mechanism with the image acquisition device 230.
Step 160, adjusting imaging parameters of the image capturing device 230 based on the second target image.
Among other imaging parameters of the image capturing device 230 include parameters such as field of view, resolution, depth of field, sensor size, and primary magnification.
In this embodiment, according to the second target image of the pole piece 210 acquired by the image acquisition device 230, it is determined whether the image acquisition device 230 can clearly shoot the detail information and the size information on the pole piece 210, and parameters such as the field of view, resolution, depth of field, sensor size, and main magnification of the image acquisition device 230 are adjusted, so that the image of the pole piece 210 acquired by the image acquisition device 230 can accurately reflect the defect information and the size information on the pole piece 210, and detection of the pole piece defect is realized.
In the related art, lithium battery materials are directly calibrated under a backlight station, calibration fails after materials of other types are replaced, and after calibration of the materials is completed, if left-right offset occurs during feeding of lithium batteries of the same type, the calibration fails, so that measurement data of the dimensions of the lithium battery materials are inaccurate, errors are easy to occur in a manual debugging process, and large-range measurement precision deviation occurs in subsequent detection.
In this embodiment of the application, through the angle of feeding of pole piece 210, carry out the position appearance adjustment to light source 220, rethread image acquisition device 230 shoots the image of light source 220, adjust the relative position appearance between light source 220 and the image acquisition device 230, finally shoot the image of pole piece 210 through image acquisition device 230, adjust the imaging parameter of image acquisition device 230, standardize pole piece defect detection system's calibration process, after carrying out the calibration to the position appearance of light source 220 and image acquisition device 230, under the condition of changing the pole piece material, the calibration can not become invalid, pole piece defect detection system's detection precision is high.
According to the calibration method of the pole piece defect detection system provided by the embodiment of the application, the imaging parameters of the image acquisition device 230 are adjusted by adjusting the relative pose between the light source 220 and the image acquisition device 230, the calibration process of the pole piece defect detection system is standardized, the calibration cannot be invalid under the condition of replacing pole piece materials, and the detection precision of the pole piece defect detection system is high.
In some embodiments, the pole piece conveying mechanism further comprises a smoothing component, the smoothing component comprises two clamping arms, the pole piece 210 and the inner surface of one of the two clamping arms are in the same plane, a transparent substrate is clamped between the two clamping arms, the transparent substrate is located on the second face of the pole piece 210, the transparent substrate is provided with a second target point, and the second target image comprises pixel information of the second target point.
As shown in fig. 6, the smoothing assembly includes a first clamping arm 251 and a second clamping arm 252, where the pole piece 210 is closely attached to the inner surface of the first clamping arm 251, and the plane of the pole piece 210 is the same as the plane of the inner surface of the first clamping arm 251.
In this embodiment, the transparent substrate may be a transparent acrylic plate, and the transparent substrate is located on the second surface of the pole piece 210 and is closely attached to the pole piece 210.
In actual implementation, the second target image acquired by the image acquisition device 230 includes pixel information of the pole piece and pixel information of the second target point on the transparent substrate.
It will be appreciated that the pole piece 210 is opaque, and if the second target is directly disposed on the pole piece 210, the image capturing device 230 cannot accurately obtain the pixel information of the second target on the pole piece 210.
In this embodiment, by providing the transparent substrate, the second target is disposed on the transparent substrate, and the transparent substrate is closely attached to the pole piece 210, so that it is ensured that the second target image has pixel information for calibration, and no influence is exerted on the pole piece 210.
In this embodiment, after the pole piece 210 is disposed in the pole piece conveying mechanism, the image capturing device 230 photographs the pole piece 210 disposed in the pole piece conveying mechanism, and obtains a second target image of the pole piece 210, where the second target image includes pixel information of the second target point.
It should be noted that, the pixel information of the second target may include information such as transition pixel information and pole piece dimensional accuracy information, and different imaging parameters of the image capturing device 230 may be adjusted according to different pixel information.
In some embodiments, step 160 of adjusting imaging parameters of the image acquisition device 230 based on the second target image may include:
in the event that it is determined that the transition pixel information in the second target image is greater than the pixel threshold, the imaging parameters of the image acquisition device 230 are adjusted.
The transition pixel information is the number of transition pixels near the second target point, the transition pixels refer to gray pixels with pixel colors between white and black, and the pixel threshold is a preset threshold meeting the definition detection requirement.
For example, the pixel threshold may be set to 2, the number of transition pixels in the second target image near the second target point is greater than 2, and the imaging parameters associated with the sharpness of the image capture device 230 are adjusted; the number of transition pixels in the second target image near the second target point is no greater than 2 without adjusting the sharpness-related imaging parameters of the image capturing device 230.
In this embodiment, according to the transition pixel information in the second target image, when the number of transition pixels in the second target image is greater than the pixel threshold, it indicates that the sharpness of the image acquired by the image acquisition device 230 does not meet the requirement, and the imaging parameters related to sharpness in the image acquisition device 230 are adjusted.
When the transition pixel information in the second target image is less than or equal to the pixel threshold, it indicates that the sharpness of the image acquired by the image acquisition device 230 meets the requirement, and no adjustment of the imaging parameters in the image acquisition device 230 is required.
In this embodiment, the imaging parameters of the image capturing device 230 adjusted according to the transition pixel information may be resolution parameters.
After the image capturing device 230 obtains the second target image, the fewer the number of transition pixels near the second target point in the second target image, which indicates that the better the imaging definition of the image capturing device 230, it is easier to detect whether there are fine defects such as pinhole defects in the pole piece 210 when the detection is performed.
In some embodiments, step 160 of adjusting imaging parameters of the image acquisition device 230 based on the second target image may include:
in the event that it is determined that the pole piece dimensional accuracy information in the second target image is greater than the dimensional accuracy threshold, the imaging parameters of the image acquisition device 230 are adjusted.
In this embodiment, according to the distance between two pixels in the second target image, the distance between the two pixels corresponding to the solid structure may be determined, and according to the distance between the two pixels and the distance between the two corresponding points of the pole piece 210, the imaging parameters related to the dimensional accuracy of the image capturing device 230 are adjusted.
For example, the distance between two pixel points in the second target image is a first distance, the distance between two corresponding solid structures is a first distance, the distance between two corresponding points of the pole piece 210 is a second distance, the difference between the first distance and the second distance is calculated, and when the difference is greater than the corresponding size precision threshold, the imaging parameters of the image acquisition device 230 are adjusted.
In this embodiment, the second target image includes a first line and a second line, the first line corresponds to a third line in the pole piece 210, the second line corresponds to a fourth line in the pole piece 210, the first line and the second line are sufficiently far apart, and the third line and the fourth line are sufficiently far apart.
The distance between the first line and the second line is the image distance, and the image distance is amplified in the same proportion according to the main magnification of the image acquisition device 230, so as to obtain the first distance.
The distance between the third line and the fourth line is a second interval, wherein the pole piece dimension precision information is the difference between the first interval and the second interval.
In actual implementation, multiple groups of first lines and second lines in the second target image can be acquired according to the second target image by a design algorithm, multiple first distances and multiple second distances are determined, multiple pole piece size precision information is determined according to the multiple first distances and one second distance, and the size relation between the multiple pole piece size precision information and the size precision threshold is acquired.
When the absolute value of the pole piece size precision information is larger than the size precision threshold, the main magnification of the image acquisition device 230 is adjusted until the pole piece size precision information is smaller than or equal to the size precision threshold.
For example, the size accuracy threshold may be set to 0.1mm, and in the case where it is determined that the absolute values of the size accuracy information of the plurality of pole pieces acquired by the algorithm are all smaller than or equal to the size accuracy threshold, the imaging parameter adjustment of the image pickup device 230 is completed.
In some embodiments, the first target includes a first target and two second targets, the first target is located at a center of the light source 220, the two second targets are located at opposite sides of the light source 220, and adjusting the mounting pose of the image capturing device 230 based on the pixel information of the first target in the first target image includes:
the mounting pose of the image capturing device 230 is adjusted based on the pixel information of the first target point and the two second target points in the first target image, so that the pixel information of the first target point is located at the center position of the first target image, and the pixel information of the two second target points is located at the opposite edge positions of the first target image.
In practical implementation, the first target and the second target may be black pixels with a size less than 2mm by 2 mm.
In this embodiment, the first target point is disposed at the center of the light source 220 and corresponds to the center position in the first target image, and the second target point is disposed at two opposite sides of the light source 220 and corresponds to two opposite edge positions in the first target image.
By the fact that the actual positions of the first target point and the second target point in the pole piece 210 correspond to the positions of the first target point and the second target point in the first target image one by one, the relative positions between the image acquisition device 230 and the light source 220 can be accurately calibrated.
A specific embodiment is described below for describing a method of calibrating a pole piece defect detection system of the present application.
As shown in fig. 3, adjusting the posture and position of the light source 220 includes: the pitch of the light source 220 is adjusted so that the light emitting surface of the light source 220 is perpendicular to the feeding direction of the pole piece 210, a first target point is arranged at the center of the light source 220, and a second target point is respectively arranged at two opposite sides of the light source 220.
Adjusting the pose and imaging position of the image acquisition device 230 includes: the pitching of the image capturing device 230 and the image capturing device 230 are adjusted, it is determined that a first target point can be seen at the center of a first target image obtained by the image capturing device 230, and a second target point can be seen at two opposite sides of the first target image, so that the center line of the target surface of the image capturing device 230 is collinear with the center line of the light emitting surface of the light source 220, and the posture of the image capturing device 230 is determined.
Adjusting the imaging definition of the image acquisition device 230, unifying the brightness value range of the light source 220 and the exposure time range requirement of the image acquisition device 230, performing white balance on the light source 220 by using the image acquisition device 230, and adjusting the brightness of the light source 220 and the exposure time of the image acquisition device 230 so that the image acquisition device 230 meets the preset imaging definition requirement.
The imaging definition is finely adjusted, firstly, whether the distance between the pole piece 210 in the pole piece conveying mechanism and the image acquisition device 230 meets the preset imaging definition requirement is judged according to the transverse resolution of the center of the field of view of the first target image in the image acquisition device 230, and the working position of the image acquisition device 230 is adjusted under the condition that the preset imaging definition requirement is not met, so that the transverse resolution of the image in the image acquisition device 230 meets the preset imaging definition requirement.
The pole piece 210 is located between two clamping arms of the smoothing mechanism, a transparent substrate is arranged between the two clamping arms, the transparent substrate is clung to the pole piece 210, a second target point is arranged on the transparent substrate, the pole piece 210 in the pole piece conveying mechanism is shot through the image acquisition device 230, a second target image is acquired, imaging parameters of the image acquisition device 230 relevant to resolution are adjusted, and therefore the number of transition pixels of the second target point at the edge of the corresponding position in the second target image is smaller than or equal to a pixel threshold value.
When the number of transition pixels is less than or equal to the pixel threshold, the image capture device 230 is reworked, without adjusting the resolution-related imaging parameters of the image capture device 230.
And calibrating the transverse dimension measurement precision and the longitudinal dimension measurement precision, wherein the longitudinal dimension measurement precision can be directly used as a calibration result of a roll surface station.
The calibration of the transverse dimension measurement precision is firstly to design an algorithm calculation scheme, obtain a plurality of dimension precision of the pole pieces 2, and adjust the main magnification of the image acquisition device 230 when the dimension precision of the pole pieces is larger than a dimension precision threshold value so that the dimension precision of the pole pieces is smaller than or equal to the dimension precision threshold value.
According to the calibration method of the pole piece defect detection system, the execution main body can be a calibration device of the pole piece defect detection system. In the embodiment of the application, the calibration device of the pole piece defect detection system provided by the embodiment of the application is described by taking the calibration method of the pole piece defect detection system executed by the calibration device of the pole piece defect detection system as an example.
The embodiment of the application also provides a calibration device of a pole piece defect detection system, the pole piece defect detection system comprises a light source 220, an image acquisition device 230 and a pole piece conveying mechanism, the pole piece conveying mechanism is used for conveying a pole piece 210, the light source 220 is located on a first face of the pole piece 210, and the image acquisition device 230 is located on a second face of the pole piece 210.
As shown in fig. 7, the pole piece defect detecting device includes:
a first obtaining module 710, configured to obtain a feeding angle of the pole piece 210 transmitted by the pole piece transmitting mechanism;
the first processing module 720 is configured to adjust an installation pose of the light source 220 based on the feeding angle, so that a light emitting surface of the light source 220 is perpendicular to a plane where the pole piece 210 is located;
a second acquiring module 730, configured to acquire, by using the image capturing device 230, a first target image of the light source 220, where the light source 220 is provided with a first target point;
a second processing module 740, configured to adjust an installation pose of the image capturing device 230 based on pixel information of the first target point in the first target image;
a third obtaining module 750, configured to obtain, by using the image capturing device 230, a second target image of the pole piece 210 transmitted by the pole piece transmitting mechanism;
a third processing module 760 for adjusting imaging parameters of the image acquisition device 230 based on the second target image.
According to the pole piece defect detection device provided by the embodiment of the application, the imaging parameters of the image acquisition device 230 are adjusted by adjusting the relative pose between the light source 220 and the image acquisition device 230, the calibration process of the pole piece defect detection system is standardized, the calibration cannot be invalid under the condition of replacing pole piece materials, and the detection precision of the pole piece defect detection system is high.
In some embodiments, the pole piece conveying mechanism further comprises a smoothing component, the smoothing component comprises two clamping arms, the pole piece 210 and the inner surface of one of the two clamping arms are in the same plane, a transparent substrate is clamped between the two clamping arms, the transparent substrate is located on the second face of the pole piece 210, the transparent substrate is provided with a second target point, and the second target image comprises pixel information of the second target point.
In some embodiments, the third processing module 760 is configured to adjust the imaging parameters of the image acquisition device 230 if it is determined that the transition pixel information in the second target image is greater than the pixel threshold.
In some embodiments, the third processing module 760 is configured to adjust the imaging parameters of the image acquisition device 230 if it is determined that the pole piece dimensional accuracy information in the second target image is greater than the dimensional accuracy threshold.
In some embodiments, the second processing module 740 is configured to adjust the installation pose of the image capturing device 230 based on the pixel information of the first target point and the two second target points in the first target image, so that the pixel information of the first target point is located at the center position of the first target image, and the pixel information of the two second target points is located at the opposite edge positions of the first target image.
The embodiment of the application also provides a pole piece defect detection system.
The system comprises a light source 220, an image acquisition device 230 and a pole piece conveying mechanism, wherein the pole piece conveying mechanism is used for conveying a pole piece 210, the light source 220 is positioned on a first surface of the pole piece 210, and the image acquisition device 230 is positioned on a second surface of the pole piece 210;
the controller is electrically connected with the light source 220, the image acquisition device 230 and the pole piece conveying mechanism, and is used for calibrating the pole piece defect detection system based on the calibrating method of the pole piece defect detection system.
According to the pole piece defect detection system provided by the embodiment of the application, the imaging parameters of the image acquisition device 230 are adjusted by adjusting the relative pose between the light source 220 and the image acquisition device 230, the calibration process of the pole piece defect detection system is standardized, the calibration cannot be invalid under the condition of replacing pole piece materials, and the detection precision of the pole piece defect detection system is high.
The pole piece defect detection device in the embodiment of the application can be an electronic device, and also can be a component in the electronic device, such as an integrated circuit or a chip. The electronic device may be a terminal, or may be other devices than a terminal. By way of example, the electronic device may be a mobile phone, tablet computer, notebook computer, palm computer, vehicle-mounted electronic device, mobile internet appliance (Mobile Internet Device, MID), augmented reality (augmented reality, AR)/Virtual Reality (VR) device, robot, wearable device, ultra-mobile personal computer, UMPC, netbook or personal digital assistant (personal digital assistant, PDA), etc., but may also be a server, network attached storage (Network Attached Storage, NAS), personal computer (personal computer, PC), television (TV), teller machine or self-service machine, etc., and the embodiments of the present application are not limited in particular.
The pole piece defect detection device in the embodiment of the application can be a device with an operating system. The operating system may be an Android operating system, an IOS operating system, or other possible operating systems, which is not specifically limited in the embodiments of the present application.
The pole piece defect detection device provided in the embodiment of the present application can implement each process implemented by the method embodiments of fig. 1 to 6, and in order to avoid repetition, a detailed description is omitted here.
In some embodiments, as shown in fig. 8, the embodiment of the present application further provides an electronic device 800, including a processor 801, a memory 802, and a computer program stored in the memory 802 and capable of running on the processor 801, where the program when executed by the processor 801 implements the processes of the above-mentioned pole piece defect detection method embodiment, and the same technical effects can be achieved, and for avoiding repetition, a description is omitted herein.
The electronic device in the embodiment of the application includes the mobile electronic device and the non-mobile electronic device described above.
The embodiment of the application further provides a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements each process of the above pole piece defect detection method embodiment, and can achieve the same technical effect, so that repetition is avoided, and no further description is given here.
Wherein the processor is a processor in the electronic device described in the above embodiment. The readable storage medium includes computer readable storage medium such as computer readable memory ROM, random access memory RAM, magnetic or optical disk, etc.
The embodiment of the application also provides a computer program product, which comprises a computer program, wherein the computer program realizes the pole piece defect detection method when being executed by a processor.
Wherein the processor is a processor in the electronic device described in the above embodiment. The readable storage medium includes computer readable storage medium such as computer readable memory ROM, random access memory RAM, magnetic or optical disk, etc.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solutions of the present application may be embodied essentially or in a part contributing to the prior art in the form of a computer software product stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), comprising several instructions for causing a terminal (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the methods described in the embodiments of the present application.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The method for calibrating the pole piece defect detection system is characterized in that the pole piece defect detection system comprises a light source, an image acquisition device and a pole piece conveying mechanism, wherein the pole piece conveying mechanism is used for conveying a pole piece, the light source is positioned on a first surface of the pole piece, the image acquisition device is positioned on a second surface of the pole piece, and the method for calibrating the pole piece defect detection system comprises the following steps:
Acquiring a feeding angle of the pole piece transmitted by the pole piece transmission mechanism;
based on the feeding angle, adjusting the mounting pose of the light source so that the light emitting surface of the light source is perpendicular to the plane where the pole piece is positioned;
acquiring a first target image of the light source through the image acquisition device, wherein the light source is provided with a first target point;
adjusting the mounting pose of the image acquisition device based on the pixel information of the first target point in the first target image;
acquiring a second target image of the pole piece transmitted by the pole piece transmitting mechanism through the image acquisition device;
and adjusting imaging parameters of the image acquisition device based on the second target image.
2. The method for calibrating a pole piece defect detection system according to claim 1, wherein the pole piece conveying mechanism further comprises a smoothing component, the smoothing component comprises two clamping arms, the pole piece and the inner surface of one of the two clamping arms are in the same plane, a transparent substrate is clamped between the two clamping arms, the transparent substrate is located on the second face of the pole piece, the transparent substrate is provided with a second target point, and the second target image comprises pixel information of the second target point.
3. The method of calibrating a pole piece defect detection system according to claim 2, wherein the pixel information of the second target point includes transition pixel information, and the adjusting the imaging parameters of the image acquisition device based on the second target image includes:
and adjusting imaging parameters of the image acquisition device under the condition that the transition pixel information in the second target image is determined to be larger than a pixel threshold value.
4. The method for calibrating a pole piece defect detection system according to claim 2, wherein the pixel information of the second target point includes pole piece dimensional accuracy information, and the adjusting the imaging parameters of the image acquisition device based on the second target image includes:
and adjusting imaging parameters of the image acquisition device under the condition that the size precision information of the pole piece in the second target image is larger than a size precision threshold value.
5. The method for calibrating a pole piece defect detection system according to any one of claims 1-4, wherein the first target includes a first target and two second target targets, the first target is located at a center of the light source, the two second target targets are located at opposite sides of the light source, and the adjusting the mounting pose of the image capturing device based on the pixel information of the first target in the first target image includes:
And adjusting the mounting pose of the image acquisition device based on the pixel information of the first target point and the two second target points in the first target image so that the pixel information of the first target point is positioned at the center position of the first target image, and the pixel information of the two second target points is positioned at the opposite edge positions of the first target image.
6. A pole piece defect detection system, comprising:
the device comprises a light source, an image acquisition device and a pole piece conveying mechanism, wherein the pole piece conveying mechanism is used for conveying a pole piece, the light source is positioned on a first surface of the pole piece, and the image acquisition device is positioned on a second surface of the pole piece;
the controller is electrically connected with the light source, the image acquisition device and the pole piece conveying mechanism, and the controller calibrates the pole piece defect detection system based on the calibration method of the pole piece defect detection system according to any one of claims 1-5.
7. The utility model provides a calibrating device of pole piece defect detection system, its characterized in that, pole piece defect detection system includes light source, image acquisition device and pole piece transport mechanism, pole piece transport mechanism is used for conveying the pole piece, the light source is located the first face of pole piece, image acquisition device is located the second face of pole piece, pole piece defect detection system's calibrating device includes:
The first acquisition module is used for acquiring the feeding angle of the pole piece transmitted by the pole piece transmission mechanism;
the first processing module is used for adjusting the mounting pose of the light source based on the feeding angle so that the light emitting surface of the light source is perpendicular to the plane where the pole piece is located;
the second acquisition module is used for acquiring a first target image of the light source through the image acquisition device, and the light source is provided with a first target point;
the second processing module is used for adjusting the installation pose of the image acquisition device based on the pixel information of the first target point in the first target image;
the third acquisition module is used for acquiring a second target image of the pole piece transmitted by the pole piece transmission mechanism through the image acquisition device;
and the third processing module is used for adjusting imaging parameters of the image acquisition device based on the second target image.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements a method for calibrating a pole piece defect detection system according to any of claims 1-5 when the program is executed by the processor.
9. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements a method of calibrating a pole piece defect detection system according to any of claims 1-5.
10. A computer program product comprising a computer program, characterized in that the computer program, when executed by a processor, implements a method for calibrating a pole piece defect detection system according to any of claims 1-5.
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| CN117647546A (en) * | 2024-01-29 | 2024-03-05 | 浙江华视智检科技有限公司 | Security check imaging method and related device |
| CN117647546B (en) * | 2024-01-29 | 2024-05-07 | 浙江华视智检科技有限公司 | Security check imaging method and related device |
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