Optical cable stranding pitch detection and adjustment method and system based on visual system

Abstract

The invention discloses an optical cable stranding pitch detection and adjustment method and system based on a visual system. Comprising a visual system arranged on an optical cable twisting production line and used for continuously collecting image information of one or more color optical cables in the production process, and a processor is configured with a computer program to analyze the image information collected by the visual system and obtain optical characteristic information. And determining a first feature region and a second feature region according to common feature information in the optical feature information of all the color optical cables. The cable stranding pitch is determined by matching features in the first and second feature regions. The system further comprises an adjusting method and an adjusting system, according to the method and the system, the adjustment of the twisting pitch is obtained according to the measurement value of the twisting pitch obtained by the visual system, so that the pitch measurement precision of the optical cable twisting process is improved, and the reliability of the whole production system is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical cable production and processing, and particularly relates to a method and system for detecting and adjusting the stranding pitch of an optical cable based on a vision system. Background Art

[0002] In the field of optical cable manufacturing, especially in the production of optical cable stranding, the process involves twisting at least multiple sheaths of different colors. And the optical cable stranding parameters are important technical parameters reflecting the mechanical properties and tension of the optical cable. However, the current manufacturing process faces several challenges.

[0003] The traditional method of measuring the pitch is to manually select target points and then manually measure the length between these points. This method not only has a high labor intensity but also is prone to errors due to arbitrary selection and poor length measurement accuracy. In fact, affected by various factors, the pitch parameters can be affected during the production rhythm, resulting in measurement errors. Factors such as loosening, belt slipping, equipment stability, and differences between low-speed and high-speed sections will all affect the pitch measurement in actual production.

[0004] In addition, with the continuous increase in the production speed of stranded optical cables, manual on-line measurement has become almost impossible. The current method of stopping the machine for measurement seriously affects the production rhythm.

[0005] Currently, some solutions have been found in the prior art to solve the above problems, but there are still some limitations. For example, Document CN112577436B discloses a method and system for on-line measurement of the stranding pitch of a stranded optical cable. When the stranded optical cable moves a certain length, a pulse is output to a linear array camera by a laser length measuring instrument, and the high-speed linear array camera and a filter are controlled to perform image acquisition. The stranding pitch of the optical cable is measured by extracting the contour, the morphological features of a single pitch, and the morphological features of the commutation point from the image. This requires outputting a pulse to the linear array camera, thus increasing the control and measurement costs and strongly relying on the pulse control of taking pictures.

[0006] For example, Document CN114660748A discloses a method, device, electronic device, and storage medium for controlling optical cable stranding. The method includes: determining the compensation amplitude of the stranding pitch of the stranding section to be compensated in the current reciprocating stranding of the optical cable; identifying the stranding section to be compensated in each stage of the current reciprocating stranding of the optical cable. The measurement of the stranding pitch is mainly achieved by the winding action of the servo motor used for stranding to measure the change in pitch. The obtained pitch information is limited in information capacity and accuracy because it depends on the data of indirect measuring devices, and more pitch information about the optical cable production cannot be obtained, nor can precise control be achieved.

[0007] Therefore, a more effective and accurate method and system for detecting and adjusting the stranding pitch of an optical cable are needed. Summary of the Invention

[0008] Therefore, in view of at least one of the above defects or improvement requirements of the prior art, the present invention discloses an optical cable stranding pitch detection system based on a vision system, which is characterized by comprising:

[0009] One or more vision systems for acquiring image data of one or more stranded optical cables during optical cable stranding production;

[0010] One or more processors for processing and analyzing the acquired image data;

[0011] At least one first feature region and at least one second feature region, where the at least one first feature region and the at least one second feature region are obtained by examining the processed image data for the same feature recognition; and

[0012] Calculating the stranding pitch based on the same feature identification in the at least one first feature region and the at least one second feature region.

[0013] Wherein, the vision system is used to collect a plurality of image data at continuous clock beats.

[0014] Wherein, the first feature region and / or the second feature region include stranding pitch information of a plurality of different continuous clock beat periods of a plurality of color optical cables.

[0015] Wherein, the vision system has a compensation light source for irradiating the first feature region and the second feature region to enhance the optical reflection parameters under different degrees of optical cable stranding.

[0016] The present invention also discloses an optical cable stranding pitch detection method based on a vision system, which is characterized by

[0017] Using one or more vision systems to acquire image data of one or more stranded optical cables during optical cable stranding production;

[0018] Using one or more processors to process and analyze the acquired image data;

[0019] Examining the processed image data for the same feature recognition to obtain at least one first feature region and at least one second feature region; and

[0020] Calculating the stranding pitch based on the same feature recognition in the at least one first feature region and the at least one second feature region.

[0021] Among them, the present invention discloses an optical cable pitch adjustment system for the optical cable stranding pitch detection system, characterized in that the system includes:

[0022] An adjustment amplitude determination module, an adjustment interval identification module, and a control adjustment module,

[0023] The adjustment amplitude determination module is configured to determine the compensation amplitude of the stranding pitch of the optical cable,

[0024] The adjustment interval identification module is configured to identify the compensation interval value in each cycle stage of the back-and-forth winding of each optical cable of different colors,

[0025] The control adjustment module is configured to generate parameter values for performing stranding control and send them to the stranding execution motor.

[0026] Among them, the obtained stranding pitch is displayed as multiple parameters at the control machine end.

[0027] Among them, the vision system includes multiple cameras arranged at different length distances in the production process site, and the positional relationship between the multiple cameras can be adjusted.

[0028] Among them, when the stranding pitch is within the set threshold range, the control machine end executes an alarm.

[0029] The present invention also discloses an optical cable pitch adjustment method for the optical cable pitch adjustment system, characterized in that

[0030] Adjust the execution motor according to the parameter values so that the difference in the adjusted optical cable pitch is within a preset range.

[0031] Generally speaking, compared with the prior art through the above technical solutions conceived by the present invention, the following beneficial effects can be achieved:

[0032] The optical cable stranding pitch detection and adjustment method and system based on the vision system implemented according to the present invention minimize the vision system under the control of the photographing rhythm analyzed from the speed, and make improvements. It directly adopts the method of continuously collecting images to perform image analysis and feature extraction, can obtain more flexible feature information, can flexibly analyze and adjust multiple parameters and multiple cycles in the overall optical cable stranding production process, and can perform more feature analysis based on a large number of data points, obtain refined layer stranding data of multiple optical cables of different colors, and perform refined detection and pitch adjustment control at different stranding depths. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a field schematic diagram of the optical cable stranding pitch detection system based on the vision system implemented according to the present invention;

[0034] Figure 2 Schematic flow of the optical cable lay length detection and adjustment method based on a vision system implemented according to the present invention Figure 1 .

[0035] Figure 3 Schematic flow of the optical cable lay length detection and adjustment method based on a vision system implemented according to the present invention Figure 2 .

[0036] Figure 4 Schematic flow of the optical cable lay length detection and adjustment method based on a vision system implemented according to the present invention Figure 3 . Detailed implementation manners

[0037] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] As Figure 1 shown in

[0039] the present invention provides an optical cable lay length detection system based on a vision system, including:

[0040] The visual system in the present invention includes a light source projection system and a receiving system for collecting and analyzing images of the surface of the optical cable after passing through the light source projection system. In the layer twisting production process of the optical cable, there may be a variety of different twisting methods, and each different twisting method means that the position of the optical cable layer twisting is different. On the other hand, under the projection of the same light source projection system, the surface appearance characteristics shown are not the same, which is reflected in the image pixels, or the side view of a single optical cable. The radial direction of the optical cable presented in the image of the optical cable will gradually decrease, and a large axial length dimension extension will be presented on the boundary of the twisting. In this way, feature points are formed for the subsequent analysis of the visual inspection results of the optical cable layer twisting. In this way, the first feature area in one embodiment is specifically an area with the longest axial length dimension extension of the layer twisted optical cable of the current color in a side view, and the second feature area is another adjacent area with the longest dimension extension. The length of the twisting pitch is determined by the starting point of the above two areas.

[0041] In other embodiments, further, multiple feature areas may be collected from multiple side angles of multiple layer-twisted optical cables to obtain the twisting pitch under the average algorithm.

[0042] The visual system is configured to continuously capture images without setting the position relationship specifically. In combination with visual acquisition at multiple angles, the visual system can be configured for motion shooting, either axial or radial motion.

[0043] The processor is used to parse the captured multiple images and extract images from multiple image frames for analysis. In a preferred embodiment, the control timing of the visual system or the processor can be synchronized with the twisting control timing used to control the motor in production.

[0044] The first characteristic area and the second characteristic area include multiple spacing lengths. The multiple spacing lengths include, on the first aspect, multiple optical cables of multiple colors. On the second aspect, they include the collection of multiple viewing angles in the radial direction. On the third aspect, they include the collection of multiple spacings in the axial direction, so as to increase the accuracy of data collection.

[0045] Among them, the obtained torsion pitch is preferably displayed as multiple parameters on the control machine end to finely analyze the specific adjustment information of each operating motor corresponding to each color.

[0046] As another aspect of the present invention, a method for detecting the twisting pitch of an optical cable based on a visual system is disclosed, comprising:

[0047] In an optical cable stranding production system, image information of one or more colored optical cables is collected; the collected image information is analyzed to obtain a first feature area and a second feature area; and the optical cable pitch is determined by matching features in the first and second feature areas.

[0048] Among them, the collection of image information does not require connecting a motor to control pulses to control shooting, or a motor can also be connected to control pulses to achieve control of shooting.

[0049] Among them, multiple pitch parameters are obtained from multiple characteristic regions in the period segment to obtain more accurate pitch information.

[0050] As a further preference of the present invention, a method for adjusting the stranding pitch of an optical cable is disclosed, including:

[0051] Determine the compensation amplitude of the stranding pitch of the currently stranded optical cable;

[0052] Control the adjustment of the stranding pitch according to the compensation amplitude, so that the difference between the adjusted different stranding pitches is within a preset range.

[0053] Furthermore, it also includes a system for adjusting the stranding pitch, including an adjustment amplitude determination module, an adjustment interval identification module, and a control adjustment module.

[0054] Among them, the adjustment amplitude determination module is configured to determine the compensation amplitude of the stranding pitch of the optical cable.

[0055] Among them, the adjustment interval identification module is configured to identify the compensation interval value in each cycle stage of the back-and-forth winding of each optical cable of different colors.

[0056] Specifically, through the above-mentioned detection system of the stranding pitch, in the analysis of the obtained multiple characteristic information, the compensation amplitude is obtained, and the above-mentioned compensation amplitude is preferably the compensation amplitude of multiple color optical cables.

[0057] Among them, the control adjustment module is configured to generate parameter values for performing stranding control and send them to the stranding execution motor. The vision system further preferably includes a structured light system with multiple cameras to add specific feature projection light for image feature point analysis. The multiple cameras are arranged at different length distances in the production process site, and the positional relationship between the multiple cameras can be adjusted.

[0058] As Figure 2 shown, a flowchart of an example method 100 for adjusting the stranding pitch information based on a vision system according to an embodiment.

[0059] The method 100 includes collecting image information of one or more colored optical cables in an optical cable winding production system in at least one processor system. The method 100 also includes analyzing the collected image information to obtain a first characteristic region and a second characteristic region; matching the features in the first and second characteristic regions to determine the stranding pitch of the optical cable; generating the stranding pitch to be adjusted based on the detected stranding pitch of the optical cable.

[0060] Method 100 preferably obtains a plurality of pitch parameters from multiple feature regions in a cycle segment to obtain more accurate pitch information. Method 100 also includes displaying the obtained stranding pitch as a plurality of parameters on the control machine side.

[0061] As Figure 3 shown, it is a flowchart of an example method 200 for detecting and adjusting the optical cable stranding pitch based on a vision system in another implementation manner in an optical cable stranding production system. Method 200 includes collecting image information of one or more stranded optical cables in optical cable stranding production. Performing analysis on the collected image information. Calculating the stranding pitch.

[0062] In the method 200 corresponding to this embodiment, it preferably includes extracting image data using a plurality of image frames. And it also includes irradiating a specific feature projection light for feature enhancement using at least one supplementary light source system. Among them, the enhancement of the feature region is the separate enhancement or the simultaneous enhancement of the first feature region and the second feature region. The structured light preferably is a light band with a specific projection length. The radiation arrangement of the light band is preferably in the radial direction, or moves up and down in the radial direction. The radiation of the light band enables quick classification of regions larger or smaller than the length of the radiation light band in the analysis of the image, so as to more conveniently locate the first feature region and the second feature region. Similarly, the radiation arrangement of the light band can also be set in the axial direction to more conveniently locate the first feature region and the second feature region.

[0063] As Figure 4 shown, it is a schematic flowchart of the adjustment method corresponding to the optical cable stranding pitch adjustment system based on a vision system Figure 3 , in terms of hardware settings, the hardware processing devices of the detection and acquisition system may not be shared. At this time, after the acquisition system completes the detection data, the obtained data is used as the data of system 1, and as the control of the stranding production equipment, the system 2 data of the production equipment is acquired, and the actual produced pitch information is compared with the controlled pitch information to obtain an adjustment value. Among them, within the range where the obtained value is less than the specified value, the system realizes slow stop and alarm, and the production parameters have exceeded the scope for the system to produce stable products. If the above adjustment value does not exceed, the main control adjustment motor speed can be controlled using the above parameters to realize the adjustment in pitch production.

[0064] As a feature information processing implementation manner of the first feature region and the second feature region of the present invention, it is preferably to collect a plurality of first feature regions and a plurality of second feature regions, so as to form data of a plurality of feature regions on a certain axial length. The plurality of data can construct a plurality of feature matrices based on radial direction, axial direction, multiple colors, and with calibrated structured light bands, so as to analyze the influence of various factors such as the production control motor and the temperature uniformity in the axial direction of the production line on a single color optical cable during the production of the lay length, which is beneficial to the data collection for the improvement of the refined stranding process.

[0065] Furthermore, the present invention provides a system and method for detecting and adjusting the lay length of an optical cable based on a vision system. The system includes a vision system disposed on an optical cable winding production line for collecting image information of one or more color optical cables during the production process. The processor is configured with a computer program to analyze the image information collected by the vision system and obtain optical feature information. The first feature region and the second feature region are determined according to the common feature information in the optical feature information of all color optical cables, and in the screening and determination of the first feature region and the second feature region, it is determined by the common features of multiple color optical cables. For example, in the arrangement of the uppermost points of the stranding torque of a red optical cable and a blue optical cable, the feature of the maximum axial distance appears simultaneously. In this way, it can more accurately help to locate the feature region. It is determined by matching the features in the first and second feature regions.

[0066] Specifically, according to the system and method of the present invention, it is disposed on an optical cable stranding production line and coupled with the main control machine of the optical cable stranding production process for collecting image information of multiple color optical cables in the optical cable stranding production; and analyzing the collected image information and obtaining optical feature information. In the case of parsing out the common feature information in the optical feature information of all color optical cables, this point is determined as the first feature region. Similarly, in the case where the common feature information in the optical feature information of the second all color optical cables is the same, this point is determined as the second feature region.

[0067] When the features are matched and the same in the first feature region and the second feature region, it is the lay length.

[0068] Collect multiple image information of multiple color optical cables in the optical cable stranding production system. It is preferably not to control the pulse by linking the motor to control the photographing, which will significantly increase the cost of control and measurement, and there will be a lag in the pulse response in the lay length control.

[0069] Actually, the lay length obtained according to the present invention is multiple parameters. In a cycle segment, multiple lay length parameters can be found from multiple feature regions, so as to obtain more accurate lay length information.

[0070] The vision system in the present invention is a vision acquisition system arranged at the upper end of the optical cable. Since it continuously captures pictures, there is no need to deliberately set the positional relationship or set multiple cameras at multiple pitch positions. Multiple sets can be set at multiple length distances at the production process site. The positional relationship between multiple sets of cameras can be adjusted, and

[0071] Preferably, a structured light system or a light source enhancement system is arranged around the camera to add specific feature projection light to the vision system, thereby making it more beneficial for analyzing image feature points. The light source system preferably has different intensities, which can more prominently show the optical characteristics of each color of optical cable in different twisted states. The structured light system is preferably further supplemented with a projection scanning linear array light source to enhance the reflected light characteristics of the optical cable in different stranding states.

[0072] The first feature region and the second feature region in the present invention include multiple pitch lengths, which can be used to analyze and obtain the pitch length of each color in combination with the periodic characteristics of the photographing, and comprehensively analyze the refined control relationship between the overall stranding pitch length of the optical cable and the vision acquisition system.

[0073] The content described in this specification is only an example of the present invention. Those skilled in the art of the present invention can make various modifications, supplements, or use similar methods to replace the specific embodiments described, as long as they do not deviate from the content of this specification or exceed the scope defined by this claims, they should fall within the protection scope of the present invention.

Claims

1. An optical cable stranding pitch detection system based on a vision system, characterized in that, Comprising: One or more vision systems for acquiring image data of one or more stranded optical cables during the stranding production of optical cables; One or more processors for processing and analyzing the acquired image data; At least one first feature region and at least one second feature region, where the at least one first feature region and the at least one second feature region are obtained by examining the processed image data for identical feature recognition; And Calculating the stranding pitch based on the identical feature identification in the at least one first feature region and the at least one second feature region.

2. The optical cable stranding pitch detection system based on a vision system according to claim 1, wherein The vision system is used to acquire a plurality of image data at consecutive clock beats.

3. The optical cable stranding pitch detection system based on a vision system according to claim 1 or 2, characterized in that, The first feature region and / or the second feature region includes stranding pitch information of a plurality of different consecutive clock beat periods of a plurality of color optical cables.

4. The optical cable stranding pitch detection system based on a vision system according to claim 3, wherein, The vision system has a compensation light source for irradiating the first feature region and the second feature region to enhance the optical reflection parameters under different degrees of optical cable stranding.

5. A method for detecting the stranding pitch of an optical cable based on a vision system, characterized in that Using one or more vision systems to acquire image data of one or more stranded optical cables during the stranding production of optical cables; Using one or more processors to process and analyze the acquired image data; Examining the processed image data for identical feature recognition to obtain at least one first feature region and at least one second feature region; And Calculating the stranding pitch based on the identical feature recognition in the at least one first feature region and the at least one second feature region.

6. An optical cable pitch adjustment system based on the optical cable stranding pitch detection system described in any one of claims 1-4, characterized in that, The system includes: An adjustment amplitude determination module, an adjustment interval identification module, and a control adjustment module, The adjustment amplitude determination module is configured to determine the compensation amplitude of the stranding pitch of the optical cable, The adjustment interval identification module is configured to identify the compensation interval value in each cycle stage of the winding back and forth of each optical cable of each different color, The control adjustment module is configured to generate parameter values for performing stranding control and send them to the stranding execution motor.

7. The method for detecting the stranding pitch of an optical cable based on a vision system according to claim 5, characterized in that, Wherein the obtained stranding pitch is displayed as a plurality of parameters at the control machine end.

8. The optical cable pitch adjustment system according to claim 6, wherein The vision system includes a plurality of cameras arranged at different length distances at the production process site, and the positional relationship between the plurality of cameras can be adjusted.

9. The method for detecting the lay length of an optical cable based on a vision system according to claim 6, wherein When the stranding pitch is within the set threshold range, the control machine end executes an alarm.

10. A method for adjusting the stranding pitch of an optical cable of an optical cable stranding pitch adjustment system as described in claim 6, characterized in that Adjusting the execution motor according to the parameter values so that the difference in the adjusted optical cable stranding pitch is within a preset range.

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