CN110026449A - A kind of on-line measurement system and method based on machine vision - Google Patents

A kind of on-line measurement system and method based on machine vision Download PDF

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Publication number
CN110026449A
CN110026449A CN201910352601.1A CN201910352601A CN110026449A CN 110026449 A CN110026449 A CN 110026449A CN 201910352601 A CN201910352601 A CN 201910352601A CN 110026449 A CN110026449 A CN 110026449A
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China
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workpiece
photo
high definition
array cameras
line
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CN201910352601.1A
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CN110026449B (en
Inventor
朱晓岩
曹剑钊
张世邦
王�琦
魏超
李颂华
王子男
邴绍丹
佟圣皓
高龙飞
夏忠贤
王永华
范杨雪
吴野
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Shenyang Guanbang Technology Co ltd
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Shenyang Construction University Factory
Shenyang Jianzhu University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
    • B21C51/005—Marking devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F1/00—Bending wire other than coiling; Straightening wire
    • B21F1/02—Straightening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F1/00—Bending wire other than coiling; Straightening wire
    • B21F1/02—Straightening
    • B21F1/026—Straightening and cutting

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

The invention belongs to automated productions and detection field, and in particular to a kind of on-line measurement system and method based on machine vision.Technical scheme is as follows: a kind of on-line measurement system based on machine vision, including pair roller type bar straightening mechanism, cam-type high frequency autoset road marking, measuring device and the workpiece cutting mechanism being arranged successively, the measuring device includes two grating sensors, a high definition area array cameras, a set of high intense light source and control unit, high definition area array cameras two sides respectively dispose a grating sensor, high definition area array cameras shoots the whole region between field range two grating sensors of covering, and high intense light source covering high definition area array cameras shoots field range.The present invention can track the workpiece in movement, test the speed, scale.

Description

A kind of on-line measurement system and method based on machine vision
Technical field
The invention belongs to automated productions and detection field, and in particular to a kind of on-line measurement system based on machine vision And method.
Background technique
Existing concrete-bar straightening-cutting machine dipping mechanism mostly uses touching formula contact-making switch dipping device, is exactly reinforcing bar warp After crossing straightening, it is admitted to dipping mechanism, when reinforcing bar touches contact-making switch, cutting mechanism movement, by bar cutting.This method is not Only make contact-making switch serious wear, need to be replaced frequently, and cannot flexibly change bar cutting length, to the processing of worker Bring very big puzzlement.There are also a kind of pinch-roller type digital control steel bar dipping device, its relatively traditional touching formula contact-making switch dipping dresses Be equipped with biggish improvement, high degree of automation, precision is improved to some extent, but it the drawbacks of be that 1. not can guarantee reinforcing bar The moment keeps the state of pure rolling (pure rolling refers to that rigid body and the contact point of plane are at that moment in contacting between dipping wheel Opposing stationary, the rolling of not any opposite sliding, i.e. relative velocity is that zero) reinforcing bar is not rigid body first, secondly reinforcing bar with Exist between dipping wheel opposite sliding be there may be the phenomenon that.Revolution is transmitted to by belt 2. not can avoid dipping wheel There is the Elastic Sliding occurred between belt slippage and belt wheel and band in band in encoder process, wheel when being more than load or velocity jump And then the error phenomenon generated.
Summary of the invention
The present invention provides a kind of on-line measurement system and method based on machine vision, can carry out to the workpiece in movement It tracks, test the speed, scale.
Technical scheme is as follows:
A kind of on-line measurement system based on machine vision, including pair roller type bar straightening mechanism, the cam-type height being arranged successively Frequency autoset road marking, measuring device and workpiece cutting mechanism, the measuring device include two grating sensors, a high definition Area array cameras, a set of high intense light source and control unit, high definition area array cameras side dispose two grating sensors, high definition face battle array phase Machine shoots the whole region between field range two grating sensors of covering, high intense light source covering high definition area array cameras shooting view Wild range.
Further, the on-line measurement system based on machine vision, wherein the cam-type high frequency system for automatic marker making Device includes bracket, cam follower mechanism and ink-supplying mechanism, and the bracket includes vertical plate and bottom plate, and two vertical plates are respectively perpendicular and set It sets and is uniformly provided with multiple cylinder boss on the both ends of the bottom plate, the bottom plate；The cam follower mechanism include driving shaft, The both ends of cam, the push rod with pop-up, high-strength spring and subiculum, the driving shaft are mounted on two vertical plates by bearing On, multiple cams are fixedly mounted on the driving shaft, and the cam is successively spaced equal angular along the circumferential direction of the driving shaft It is uniformly distributed, the upper end of the push rod is equipped with the pop-up, and the subiculum is fixedly mounted on the cylinder boss, the subiculum Equipped with through-hole, in the through hole, the high-strength spring is sleeved on the push rod and is located on described for the push rod setting Between support and subiculum, the push rod is together with the cam contact；The ink-supplying mechanism includes ink bottle, ink bottle cover and confession Black head, the ink bottle are arranged in the push rod, and the ink supply head is mounted on the bottom end of the ink bottle, ink bottle cover installation In the upper end of the ink bottle.
Further, the on-line measurement system based on machine vision, wherein the ink supply head includes diversion line, folder Head and roller, rolling axle, the top of the diversion line connect the ink bottle, and the bottom end of the diversion line is equipped with the collet, The roller is flexibly connected by rolling axle with the collet, and the bottom end head of the diversion line is contacted with the roller；The ink Compression spring is equipped between the bottom end of water bottle and the collet；The roller is foam-rubber cushion ring type fountain roller wheel；Multiple ink Water bottle is respectively provided with the ink of different colours.
A kind of On-line Measuring Method based on machine vision, using the above-mentioned on-line measurement system based on machine vision, First by carrying out straightening to workpiece to roller straightener structure；Then using cam-type high frequency autoset road marking to by straightening Workpiece carries out marking；Next length is carried out to by straightening and processed workpiece of crossing using high definition area array cameras Measurement, control unit add up obtain real-time Workpiece length in real time；Finally by the signal notice workpiece shearing of grating sensor Mechanism work, cuts off the workpiece of institute's measured length in time.
Further, the On-line Measuring Method based on machine vision, specifically comprises the following steps:
Step 1: installation measuring system；Ensure the shooting field range of high definition area array cameras to two grating sensors (i.e. 1 Number grating sensor, No. 2 grating sensors) between region realize all standing, it is high while using the lighting method of front illumination Intense light source covers high definition area array cameras coverage；The inside and outside parameter of high definition area array cameras shooting area is demarcated after being installed；
Step 2: after calibration high definition area array cameras, it is corresponding that control unit according to the numerical value of calibration calculates single pixel Actual range σ, according to having demarcated photo measured zone ROI in high definition area array cameras shooting area parameter setting control unit (Regions of Interest area-of-interest), ROI region include the marking left on workpiece；
Step 3: workpiece, which enters, carries out straightening processing to roller straightener structure, then utilizes cam-type high frequency autoset road marking Marking is carried out to the workpiece Jing Guo straightening；With speed v forward movement after workpiece straightening, when No. 1 light is triggered on workpiece head After gate sensor, the signal of No. 1 grating sensor is made to become 1 from 0, photo is opened while being shot to high definition area array cameras, and passback is shone Piece is to control unit；
Step 4: the correction process that distorts to photo of control unit first extracts workpiece area profile in photo, In ROI region in photo, scan line is generated close to photo tail portion side, and perpendicular to horizontal line, starts to carry out photo Scan by column for the first time, sweep spacing is a pixel, scanning for the first time pertain only in ROI region close to photo end two/ One region；
Step 5: any one column, i.e. m column, scan line can all generate two intersection points, control unit record with workpiece profile The pixel coordinate of intersection point calculates the midpoint coordinates (R of two intersection pointsm,Cm) and record；
Step 6: after the completion of scanning for the first time, the midpoint coordinates come will be calculated and be fitted in alignment, the straight line It is the angle of Workpiece length direction center line and horizontal linear thus, i.e. workpiece and horizontal direction relative to horizontal inclination angle theta Inclination angle；
Step 7: affine transformation being carried out to photo using inclination angle theta, photo (i.e. second photo), makes workpiece after being corrected The center line of length direction is vertical with the holding of the direction of scan line, i.e., the center line in Workpiece length direction is parallel with horizontal direction 's；
Step 8: second photo being scanned by column for the second time, sweep spacing is similarly a pixel, sweeps for the second time It retouches region and is related to entire ROI region, scan line intersects with workpiece profile, the pixel coordinate of statistics intersection point number and record intersection point (Rmk,Cmk)；
Step 9: calculating, first intersection point (R when passing through scanningm1,Cm1) and the last one intersection point (Rmk,Cmk) between reality Border distance S1, calculation formula are S1=mk* σ, are recorded；
Step 10: being completed at the same time the capture to workpiece scribe area feature, i.e. scribe area outer wheels during the scanning process The calibration of wide coordinate value, using the positional relationship of each pixel of relative coordinate, that is, scribe area；
Step 11: learning that camera shoots effective physical length of workpiece by calculating the data that first photo obtains, adjust Control system is to the hauling speed of workpiece, so that workpiece advance actual range is less than camera pair in the time of camera exposure each time Workpiece is taken pictures the half of length；
Step 12: the characteristic area of first photo dashed part is captured in second photo, while in second photograph The region for finding opposite first photo in piece by the calculating identification of relative coordinate, is scanned to its end by column again, thus Realize the splicing of two photos；Next calculate corresponding region part to the distance S2 for splicing photo end. while scanning The length in pixels of cumulative workpiece is that the physical length S of corresponding workpiece is total in real time, S is total=S1+S2；Next this step is successively carried out Suddenly, to realize the on-line measurement of Workpiece length；
Step 13: when the length of the workpiece required for measurement is enough, No. 2 grating sensors being made to become 1 signal from 0 signal, closed Close high definition area array cameras；
Step 14: workpiece cutting mechanism is started to work after high definition area array cameras is closed, the workpiece of length needed for cutting off in time； It will continue the work of circulation step 3-14 after cutting workpiece.
The working principle of on-line measurement system based on machine vision is: being carried out using the bow pen of multiple colors to workpiece Effective label carries out image procossing to the photo that high definition area array cameras is taken to accurately identify reinforcing bar scribing edge feature (scribe area edge each point relative positional relationship) passes through the color of comparison photograph tags, drawn area to carry out real-time tracking The relative positional relationship of domain pixel identifies, splices, and control unit adds up obtains real-time Workpiece length in real time.
The invention has the benefit that the present invention realizes the on-line measurement to bar Workpiece length in movement, it is workpiece It is subsequent to cut out the product quality for providing accurate length data, and then improving workpiece.Most using non-contact measurement mode Limits ensure that workpiece does not have to be in contact with dipping again when measuring length, avoid damage to the existing mechanical property of workpiece Energy.
Detailed description of the invention
Fig. 1 is the on-line measurement system schematic diagram based on machine vision；
Fig. 2 is cam-type high frequency autoset road marking structure chart；
Fig. 3 is the On-line Measuring Method flow chart based on machine vision；
Fig. 4 is Workpiece length instrumentation plan；Wherein: Fig. 4 a indicates that workpiece and roller-way center line are not in the area array cameras visual field Be it is parallel, there are certain angle, that is, θ, Fig. 4 b indicates the scribing line feature of n-th exposure photograph tail end, and Fig. 4 c indicates N+1 Feature at the secondary marking exposed when the photo N captured exposes, D1 is at marking relative to workpiece outer profile Distance.
Specific embodiment
As shown in Figure 1, 2, a kind of on-line measurement system based on machine vision, including the pair roller type straightener being arranged successively Structure 21, cam-type high frequency autoset road marking 23, measuring device and workpiece cutting mechanism 28, the measuring device include two light Gate sensor 25 and 27, high definition area array cameras (CCD camera) 26, a set of high intense light source 24 and control unit, high definition face battle array 26 side of camera disposes two grating sensors 25 and 27, and high definition area array cameras 26 shoots field range and covers two grating sensings Whole region between device 25 and 27, high intense light source 24 cover high definition area array cameras 26 and shoot field range；The cam-type is high Frequency autoset road marking 23 include include bracket, cam follower mechanism and ink-supplying mechanism, the bracket includes vertical plate 1 and bottom plate 2, Two vertical plates 1 are vertically disposed on the both ends of the bottom plate 2, and four cylinder boss 8 are uniformly provided on the bottom plate 2；It is described Cam follower mechanism includes driving shaft 3, cam 5, high-strength spring 9, the push rod 6 with pop-up and subiculum 10, the driving shaft 3 Both ends be mounted on two vertical plates 1 by bearing 4, four cams 5 are fixedly mounted on the driving shaft 3, the cam edge The circumferential direction of the driving shaft 3 is successively spaced 90 ° and is uniformly distributed, and the upper end of the push rod is equipped with the pop-up 6, and the subiculum 10 is solid On the cylinder boss 8, the subiculum 10 is equipped with through-hole for Dingan County, and the push rod setting is in the through hole, described high-strength Degree spring 9 is sleeved on the push rod and between the pop-up 6 and subiculum 10, the push rod 6 with pop-up with it is described Cam 5 contacts；The ink-supplying mechanism includes ink bottle, ink bottle cover 7 and ink supply head, and the ink bottle is arranged described In push rod, the ink supply head is mounted on the bottom end of the ink bottle, and ink bottle cover 7 is mounted on the upper end of the ink bottle；It is described Ink supply head includes diversion line 12, collet 16, roller 11 and rolling axle 18, and the top of the diversion line 12 connects the ink bottle, The bottom end of the diversion line 12 is equipped with the collet 16, and the roller 11 is flexibly connected by rolling axle 18 with the collet 16, The bottom end head of the diversion line 12 is contacted with the roller 11；Pressure is equipped between the bottom end of the ink bottle and the collet 16 Spring 17；The roller 11 is foam-rubber cushion ring type fountain roller wheel；Four ink bottles are respectively provided with the ink of different colours.
A kind of On-line Measuring Method based on machine vision, using the above-mentioned on-line measurement system based on machine vision, Specifically comprise the following steps:
Step 1: installation measuring system；Ensure the shooting field range of high definition area array cameras 26 to two grating sensors All standing is realized in region between (i.e. 25, No. 2 grating sensors 27 of No. 1 grating sensor), while using the photograph of front illumination Bright mode, high intense light source 24 cover 26 coverage of high definition area array cameras；High definition area array cameras 26 is demarcated after being installed to shoot The inside and outside parameter in region；
Step 2: after calibration high definition area array cameras 26, it is corresponding that control unit according to the numerical value of calibration calculates single pixel Actual range σ, according to having demarcated photo measured zone in 26 shooting area parameter setting control unit of high definition area array cameras ROI, ROI region include the marking left on workpiece 22；
Step 3: workpiece 22, which enters, carries out straightening processing to roller straightener structure 21, then utilizes cam-type high frequency system for automatic marker making 23 pairs of the device workpiece 22 Jing Guo straightening carry out marking；With speed v forward movement after 22 straightening of workpiece, when workpiece 22 After portion triggers No. 1 grating sensor 25, the signal of No. 1 grating sensor 25 is set to become 1 from 0, high definition area array cameras 26 is opened together When shoot photo, passback photo to control unit；
Step 4: the correction process that distorts to photo of control unit first extracts 22 region contour of workpiece in photo, In ROI region in photo, generate scan line close to photo tail portion side, and perpendicular to horizontal line, start to photo into Row scans by column for the first time, and sweep spacing is a pixel, and scanning for the first time pertains only to divide in ROI region close to photo end two One of region；
Step 5: any one column, i.e. m column, scan line can all generate two intersection points, control unit note with 22 profile of workpiece The pixel coordinate of intersection point is recorded, the midpoint coordinates (R of two intersection points is calculatedm,Cm) and record；
Step 6: after the completion of scanning for the first time, the midpoint coordinates come will be calculated and be fitted in alignment, the straight line It is the angle of 22 length direction center line and horizontal linear of workpiece thus, i.e. workpiece 22 and level relative to horizontal inclination angle theta The inclination angle in direction；
Step 7: affine transformation being carried out to photo using inclination angle theta, photo (i.e. second photo), makes workpiece after being corrected The center line of 22 length directions is vertical with the holding of the direction of scan line, i.e. the center line of 22 length direction of workpiece is with horizontal direction Parallel；
Step 8: second photo being scanned by column for the second time, sweep spacing is similarly a pixel, sweeps for the second time It retouches region and is related to entire ROI region, scan line intersects with workpiece profile, the pixel coordinate of statistics intersection point number and record intersection point (Rmk,Cmk)；
Step 9: calculating, first intersection point (R when passing through scanningm1,Cm1) and the last one intersection point (Rmk,Cmk) between reality Border distance S1, calculation formula are S1=mk* σ, are recorded；
Step 10: being completed at the same time the capture to 22 scribe area feature of workpiece during the scanning process, i.e., outside scribe area The calibration of profile coordinate value, using the positional relationship of each pixel of relative coordinate, that is, scribe area；
Step 11: learning that camera shoots effective physical length of workpiece by calculating the data that first photo obtains, adjust Control system is to the hauling speed of workpiece 22, so that 22 advance actual range of workpiece is less than phase in the time of camera exposure each time Machine takes pictures the half of length to workpiece 22；
Step 12: the characteristic area of first photo dashed part is captured in second photo, while in second photograph The region for finding opposite first photo in piece by the calculating identification of relative coordinate, is scanned to its end by column again, thus Realize the splicing of two photos；Next calculate corresponding region part to the distance S2 for splicing photo end. while scanning The length in pixels of cumulative workpiece 22 is that the physical length S of corresponding workpiece is total in real time, S is total=S1+S2；Next this step is successively carried out Suddenly, to realize the on-line measurement of 22 length of workpiece；
Step 13: when the length of the workpiece 22 required for measurement is enough, No. 2 grating sensors 27 being made to become 1 letter from 0 signal Number, close high definition area array cameras 26；
Step 14: workpiece cutting mechanism 21 is started to work after high definition area array cameras 26 is closed, length needed for cutting off in time Workpiece 22；Continue the work of circulation step 3-14 after workpiece 22 is cut off.
When cam-type high frequency autoset road marking 23 works: the rotation of driving shaft 3 drives the cam 5 to rotate, 5 top of cam It pushes push rod and realizes scribing line, reach most mounted in the compressed deflection of high-strength spring 9 between pop-up 6 and subiculum 10 at this time Greatly, with the rotation of cam 5, high-strength spring 9 restores deformation to push to pop-up again, makes the push rod 6 with pop-up It keeps good with cam 5 in real time to contact；Realize that (driving shaft 3 is every for high-frequency scribing line movement by 3 high-speed rotation of driving shaft 60 turns of minute can then complete 240 scribing line movement for device one minute), and this device also takes the ink bottle of four colors, Ke Yishi Now to more color marks of workpiece 22, facilitate Division identification；12 top of diversion line connects the ink bottle, the diversion line 12 Bottom end and roller 11 contact, and size needed for diversion line 12 wants small (obtaining ideal dimensions through repeated tests), and the purpose is to anti- Only occur generating at roller (being set with sponge washer on the groove of roller) and deposit ink excessively, or even drips the phenomenon of ink at work；Work When part 22 passes through under the running track of roller 11, roller 11 will be in contact with 22 surface of workpiece, at this point, high-strength spring 9 It will be compressed, this, which will apply a upward pulling force to ink supply roller, ensures that push rod 6 remains good with cam 5 and contacts； Compression spring 17 pushes push rod in cam 5 and realizes roller 11 when workpiece scribing line acts, and compression spring 17 is also rising to a certain degree To the effect of shock absorbing pressure.

Claims (5)

1. a kind of on-line measurement system based on machine vision, which is characterized in that including be arranged successively pair roller type bar straightening mechanism, Cam-type high frequency autoset road marking, measuring device and workpiece cutting mechanism, the measuring device include two grating sensors, One high definition area array cameras, a set of high intense light source and control unit, high definition area array cameras two sides respectively dispose a grating sensor, High definition area array cameras shoots the whole region between field range two grating sensors of covering, high intense light source covering high definition face battle array Camera shoots field range.
2. the on-line measurement system according to claim 1 based on machine vision, which is characterized in that the cam-type high frequency Autoset road marking includes bracket, cam follower mechanism and ink-supplying mechanism, and the bracket includes vertical plate and bottom plate, two vertical plates point It is not vertically set on the both ends of the bottom plate, multiple cylinder boss are uniformly provided on the bottom plate；Cam follower mechanism packet Driving shaft, cam, the push rod with pop-up, high-strength spring and subiculum are included, the both ends of the driving shaft are mounted on by bearing On two vertical plates, multiple cams are fixedly mounted on the driving shaft, and the cam is successively spaced along the circumferential direction of the driving shaft Equal angular is uniformly distributed, and the upper end of the push rod is equipped with the pop-up, and the subiculum is fixedly mounted on the cylinder boss, The subiculum is equipped with through-hole, and in the through hole, the high-strength spring is sleeved on the push rod and position for the push rod setting Between the pop-up and subiculum, the push rod is together with the cam contact；The ink-supplying mechanism includes ink bottle, ink Bottle cap and ink supply head, the ink bottle are arranged in the push rod, and the ink supply head is mounted on the bottom end of the ink bottle, ink Bottle cap is mounted on the upper end of the ink bottle.
3. the on-line measurement system according to claim 2 based on machine vision, which is characterized in that the ink supply head includes Diversion line, collet and roller, the top of the diversion line connect the ink bottle, and the bottom end of the diversion line is equipped with the folder Head, the roller are flexibly connected by axis with the collet, and the bottom end head of the diversion line is contacted with the roller；The ink Compression spring is equipped between the bottom end and the collet of bottle；The roller is foam-rubber cushion ring type fountain roller wheel；Multiple inks Bottle is respectively provided with the ink of different colours.
4. a kind of On-line Measuring Method based on machine vision, which is characterized in that utilize the base as described in one of claim 1-3 In the on-line measurement system of machine vision, first by carrying out straightening to workpiece to roller straightener structure；Then high using cam-type Frequency autoset road marking carries out marking to the workpiece Jing Guo straightening；Next using high definition area array cameras to by straightening and Processed workpiece of crossing carries out measurement of length, and control unit adds up obtain real-time Workpiece length in real time；Finally by light The signal notice workpiece cutting mechanism work of gate sensor, cuts off the workpiece of institute's measured length in time.
5. the On-line Measuring Method according to claim 4 based on machine vision, which is characterized in that specifically include following step It is rapid:
Step 1: installation measuring system；Ensure the shooting field range of high definition area array cameras to two grating sensors (i.e. No. 1 light Gate sensor, No. 2 grating sensors) between region realize all standing, while using front illumination lighting method, high-strength light Source covers high definition area array cameras coverage；The inside and outside parameter of high definition area array cameras shooting area is demarcated after being installed；
Step 2: after calibration high definition area array cameras, control unit calculates the corresponding reality of single pixel according to the numerical value of calibration Distance delta, according to having demarcated photo measured zone ROI in high definition area array cameras shooting area parameter setting control unit, ROI region Include the marking left on workpiece；
Step 3: workpiece, which enters, carries out straightening processing to roller straightener structure, then using cam-type high frequency autoset road marking to warp The workpiece for crossing straightening carries out marking；With speed v forward movement after workpiece straightening, No. 1 grating is triggered when workpiece head and is passed After sensor, the signal of No. 1 grating sensor is made to become 1 from 0, photo is opened while being shot to high definition area array cameras, and passback photo arrives Control unit；
Step 4: the correction process that distorts to photo of control unit first extracts workpiece area profile in photo, in photo In ROI region in, generate scan line close to photo tail portion side, and perpendicular to horizontal line, start to carry out first to photo Secondary to scan by column, sweep spacing is a pixel, and scanning for the first time pertains only in ROI region close to photo end half Region；
Step 5: any one column, i.e. m column, scan line all can generate two intersection points, control unit record intersection point with workpiece profile Pixel coordinate, calculate two intersection points midpoint coordinates (Rm,Cm) and record；
Step 6: after the completion of scanning for the first time, the midpoint coordinates fitting that will be calculated is in alignment, and the straight line is opposite In the angle that horizontal inclination angle theta is Workpiece length direction center line and horizontal linear thus, i.e. workpiece and horizontal direction inclines Angle；
Step 7: affine transformation being carried out to photo using inclination angle theta, photo (i.e. second photo), makes Workpiece length after being corrected The center line in direction is vertical with the holding of the direction of scan line, i.e., the center line in Workpiece length direction is parallel with horizontal direction；
Step 8: second photo being scanned by column for the second time, sweep spacing is similarly a pixel, second of scanning area Domain is related to entire ROI region, and scan line intersects with workpiece profile, the pixel coordinate (R of statistics intersection point number and record intersection pointmk, Cmk)；
Step 9: calculating, first intersection point (R when passing through scanningm1,Cm1) and the last one intersection point (Rmk,Cmk) between it is practical away from From S1, calculation formula is S1=mk* σ, is recorded；
Step 10: being completed at the same time the capture to workpiece scribe area feature during the scanning process, i.e. scribe area exterior contour is sat The calibration of scale value, using the positional relationship of each pixel of relative coordinate, that is, scribe area；
Step 11: learning that camera shoots effective physical length of workpiece, regulation system by calculating the data that first photo obtains The hauling speed united to workpiece, so that workpiece advance actual range is less than camera to workpiece in the time of camera exposure each time The half for length of taking pictures；
Step 12: the characteristic area of first photo dashed part is captured in second photo, while in second photo The region that opposite first photo is found by the calculating identification of relative coordinate, is scanned again to its end, by column to realize The splicing of two photos；Next corresponding region part is calculated to the distance S2 of splicing photo end, is real-timeed while scanning The length in pixels of cumulative workpiece is that the physical length S of corresponding workpiece is total, S is total=S1+S2；Next this step is successively carried out, from And realize the on-line measurement of Workpiece length；
Step 13: when the length of the workpiece required for measurement is enough, No. 2 grating sensors being made to become 1 signal from 0 signal, closed high Clear area array cameras；
Step 14: workpiece cutting mechanism is started to work after high definition area array cameras is closed, the workpiece of length needed for cutting off in time；By work Continue the work of circulation step 3-14 after part cutting.
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Cited By (3)

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CN112461137A (en) * 2020-11-15 2021-03-09 杭州利鹏科技有限公司 Small dragon door corrugated paper length measuring system and measuring method thereof
CN112697803A (en) * 2020-12-16 2021-04-23 沈阳建筑大学 Plate strip steel surface defect detection method and device based on machine vision
CN114054637A (en) * 2021-11-23 2022-02-18 河钢股份有限公司 Wire rod scale distance setting-out device

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CN101954512A (en) * 2010-09-17 2011-01-26 重庆钢铁(集团)有限责任公司 Medium-thick plate cut-to-length shearing method
JP2014219356A (en) * 2013-05-10 2014-11-20 Ｊｆｅスチール株式会社 Apparatus for determining cut length for flying shear, and method of determining steel plate cut length of flying shear
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Publication number Priority date Publication date Assignee Title
CN112461137A (en) * 2020-11-15 2021-03-09 杭州利鹏科技有限公司 Small dragon door corrugated paper length measuring system and measuring method thereof
CN112697803A (en) * 2020-12-16 2021-04-23 沈阳建筑大学 Plate strip steel surface defect detection method and device based on machine vision
CN114054637A (en) * 2021-11-23 2022-02-18 河钢股份有限公司 Wire rod scale distance setting-out device
CN114054637B (en) * 2021-11-23 2024-02-13 河钢股份有限公司 Wire gauge length line drawing device

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