CN107310173A - The character of film thickness monitoring system and film profile image is extracted and thickness acquisition method - Google Patents
The character of film thickness monitoring system and film profile image is extracted and thickness acquisition method Download PDFInfo
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- CN107310173A CN107310173A CN201710429716.7A CN201710429716A CN107310173A CN 107310173 A CN107310173 A CN 107310173A CN 201710429716 A CN201710429716 A CN 201710429716A CN 107310173 A CN107310173 A CN 107310173A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000012544 monitoring process Methods 0.000 title claims abstract description 26
- 238000012545 processing Methods 0.000 claims abstract description 23
- 238000001125 extrusion Methods 0.000 claims abstract description 18
- 238000005096 rolling process Methods 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims description 16
- 230000011218 segmentation Effects 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 10
- 239000003086 colorant Substances 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 8
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- 238000007493 shaping process Methods 0.000 claims description 8
- 238000004458 analytical method Methods 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
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- 238000010791 quenching Methods 0.000 claims 2
- 239000010408 film Substances 0.000 description 95
- 238000004519 manufacturing process Methods 0.000 description 13
- 239000011127 biaxially oriented polypropylene Substances 0.000 description 12
- 229920006378 biaxially oriented polypropylene Polymers 0.000 description 12
- 230000001276 controlling effect Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
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- 229920003023 plastic Polymers 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
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- 230000009977 dual effect Effects 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 239000012528 membrane Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
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- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D5/00—Control of dimensions of material
- G05D5/02—Control of dimensions of material of thickness, e.g. of rolled material
- G05D5/03—Control of dimensions of material of thickness, e.g. of rolled material characterised by the use of electric means
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
Extracted and thickness acquisition method the invention discloses the character of a kind of film thickness monitoring system and film profile image, film thickness monitoring system includes extrusion unit, is cooled and shaped unit, draw unit, thickness measuring unit, monitoring and controlling unit and rolling unit, wherein being cooled and shaped unit and including has digital display equipment, thickness image pickup model, image processing module, control module, die head adjuster and frequency converter in marking module, monitoring and controlling unit.Thickness measuring unit detects film thickness and sends film profile image to digital display equipment, and image processing module is transferred to through thickness image pickup model, the mark that control module receives image processing module output has the thickness for adjusting film vertical and horizontal after the film thickness value set of position by frequency converter and die head adjuster respectively.Collection film profile picture signal in real time of the invention, analyzing and processing obtains thickness parameter, and the thickness for carrying out section by diebolt is adjusted, and the uniform purpose of film transverse gage is reached, while being consistent film longitudinal thickness by the regulation of extruded velocity.
Description
Technical field
The present invention relates to film fabrication techniques field, and in particular to the word of a kind of film thickness monitoring system and film profile image
Symbol is extracted and thickness acquisition method.
Background technology
BOPP film be bidirectional stretching polypropylene film be as obtained by biaxial tension, it be by physics, chemistry and
The plastic product that the means specially-shaped such as machinery is processed.BOPP production lines are that one non-linear, time-varying, the complexity postponed greatly
System.Its technological process mainly includes：Raw materials melt, extrusion, cooling and shaping, longitudinal stretching, cross directional stretch, trimming, at corona
Manage, batch.
It is used as physical and mechanical properties such as tensile strength, elongation at break, turbidity, the gloss of BOPP film product quality indicator
Deng because depending mainly on the attribute of material in itself, so all easily reaching requirement.And it is used as the main of re-workability and performance
Con trolling index, i.e. film gauge variation and Film Average Thickness deviation, then depend mainly on the manufacturing process of film.Even if manufacture
During plastics thickness control in the deviation range allowed in standard, but through thousands of tunics wind it is accumulative after, thickness deviation is big
Position on may form the bad defects such as hoop, sudden and violent muscle or chase, the reprocessing that these defects directly influence user is used,
Such as dislocation of color printing chromatography or the irregular corrugation phenomenon of gluing, make it reduce or lose use value.So in BOPP film production
Between the quality of most critical topic be how to improve with stabilizing films thickness and precision, also exactly this film thickness precision just directly affect
To the use value of film, the commodity value of film is determined.
Plastics thickness control is based on infrared ray, X-ray, β ray equal thickness detection techniques.Such as Application No.
2014201577223 Chinese patent is obtained after film thickness by X-ray scanning, and two PID regulators are respectively adopted to enter
The control of the horizontal and vertical thickness of row film.The Chinese patent of Application No. 2007201517097 also uses similar method,
It is pointed out simultaneously, in order to obtain film in uniform thickness, it is necessary to realize that thickness measurements and measurement position are accurately positioned.Application
Number then carried out for 2015102638543 Chinese patent by the thickness value to measuring and thickness value set in advance to score
Extrusion capacity at analysis, regulation extruder die head, to realize the uniformity regulation of extrusion composite membrane longitudinal thickness.
The online film thickness detector of Quo of BOPP Films in China manufacturing line be much with electrical control equipment it is complete from
Foreign countries introduce, and the data of calibrator are transferred to control device often by specific format.Calibrator service life typically compares
Control device length is a lot, otherwise when control device breaks down or damages can not be in use, domestic manufacturing firm both expensive
Cost is from external import, otherwise replaced with domestic control device.Even if being replaced with domestic control device also must first solve one
Individual problem, i.e., obtain accurate thickness data from former calibrator.In face of this problem, some current producers can only use open loop control
System, i.e., the sectional thickness image exported to calibrator over the display carries out personal monitoring, after then rule of thumb operation is replaced
Control device be adjusted.
This personal monitoring is not only inaccurate with adjusting, and can not also stablize.Due to lacking to the continuous accurate of film thickness
Monitoring, the quality of film product suffers from influence.Therefore, being badly in need of solving to monitor film thickness on-line automaticization and control
Transformation.
On the other hand, many integrated instrument equipment are as wide variety of recording instrument without paper, radar asorbing paint instrument etc. are traditional
Equipment with display terminal is more to be carried out data transmission and stored using specific format.To these equipment, if its display can be gathered
The reference format signal of device input such as VGA signals, are analyzed and processed to the image expressed by the signal, obtain its original thing
Reason data are simultaneously conveyed to the other equipment such as controller for relying on this data, then can greatly expand the purposes of original equipment.
The content of the invention
In view of this, calibrator display input signals can be acquired and be divided it is an object of the invention to provide one kind
Analysis is handled, and original physical value corresponding to the signal i.e. film thickness value set is obtained and export, while each thickness can be accurately positioned
The system of the corresponding die head position of value, and controlled according to these data by the control of extruder die head lip aperture and extruded velocity
Automatically controlled to carry out film thickness to BOPP film production, to reach the uniform of film thickness.Meanwhile, the present invention is also provided
The character that thickness value is extracted from the film profile image of calibrator is extracted and thickness acquisition method.
The technical solution of the present invention is to provide a kind of film thickness monitoring system of following structure, including extrusion unit, cold
But forming unit, draw unit, thickness measuring unit, monitoring and controlling unit and rolling unit,
The extrusion unit includes extruder and die head, and the draw unit includes vertical drawing-die block and horizontal drawing-die block, described
Thickness measuring unit includes the first calibrator and the second calibrator, and film raw material melt is consolidated after extruder extrusion through being cooled and shaped unit
Turn to slab, it is parent roll that slab drawn unit, which is stretched as after wide volume film by rolling unit harvesting, first calibrator and
Second calibrator is located at draw unit two ends and carries out thickness monitor to the slab and wide volume film respectively, it is characterised in that：
The cooling and shaping unit includes a marking module, and the monitoring and controlling unit includes digital display equipment, thickness figure
As pickup model, image processing module, control module, die head adjuster and frequency converter, first calibrator and the second thickness measuring
Thickness information is generated as after film profile image sending the image to digital display equipment and through thickness image pickup model by instrument
Image processing module is transferred to, the control module passes through frequency converter respectively after receiving the thickness data of image processing module output
The aperture of extruder rotating speed and die head is controlled with die head adjuster.
Preferably, the film profile image document includes a thickness curve, the seat represented in different colors respectively
Parameter and the boost line parallel with reference axis, and to indicate the thickness curve root thickness value, coordinate scale value, thickness
The character of average value；The thickness data of described image processing module output are the film profile thickness for being marked with diebolt position
Value set.
Preferably, the cooling and shaping unit includes sharp cooling roll and main air knife, the marking unit is arranged on for inciting somebody to action
Film raw material melt is attached to the front of the main air knife on sharp cooling roll, the marking unit include two its imprint heads respectively with die head two
The marking module that end bolt position is mutually fixedly connected；The marking unit matches using laser ablation module or with main air knife
Auxiliary air knife module, and the marking unit forms V-arrangement or the U-shaped breach marking in slab.
Preferably, the cooling and shaping unit includes sharp cooling roll and main air knife, the marking unit is arranged on for inciting somebody to action
Film raw material melt is attached to the front of the main air knife on sharp cooling roll, and the marking unit includes a guide rail parallel with die lips
And a marking module, the marking module includes having many on the imprint head that can be moved along the guide rail, the guide rail
Individual and diebolt has the anchor point of fixed position relation；It is described marking unit using laser ablation module or with main air knife phase
The auxiliary air knife module matched somebody with somebody, and the marking unit forms V-arrangement or the U-shaped breach marking in slab.
Preferably, the digital display equipment includes display and VGA signal distributors, the VGA signal distributors are from survey
Thick instrument receives VGA signals and signal is distributed into display and the thickness image pickup model.
Preferably, the control module include controller 1 and controller 2, the controller 2 by die head adjuster with
The mode of dutycycle controls the break-make of diebolt solid-state relay, so as to adjust the bolt by controlling the temperature of bolt
The aperture of place die head section, is adjusted with the thickness for realizing film section corresponding to the bolt；The controller 1 is to adjust frequency converter
Mode control the rotating speed of extruder, so as to realize the regulation of film ensemble average thickness by controlling extrusion capacity.
Another technical solution of the present invention is to provide a kind of character extracting method of film profile image, residing for it
The image of reason is that the horizontal section to show detected film on a display is exported and can be shown in THICKNESS GAUGE FOR THE MEASUREMENT OF THIN FOILS
The image of thickness, described image includes a thickness curve, the reference axis and parallel with reference axis represented in different colors respectively
Boost line, and to indicate the character of the thickness curve root thickness value, coordinate scale value, thickness average value, it is special
Levy and be, comprise the following steps：
A1) detect and ensure that the film profile image is target image；Pretreatment, according in the film profile image
Color characteristic and provincial characteristics obtain the first ROI region containing target character；
A2 the binaryzation feature templates storehouse of character) is built according to the character analysis being likely to occur in the first ROI region；
A3 the first acquired ROI region) is directed to, single character is isolated in detection, and feature extraction is carried out to each character
After carry out template matches, identify single character；
A4) adjacent monocase is combined, the phrase being combined into is recognized, described image Central Plains thickness is obtained bent
Root thickness value, coordinate scale value, the thickness average value of line.
Another technical solution of the present invention is to provide a kind of thickness acquisition method of film profile image, residing
The image of reason is that the horizontal section to show detected film on a display is exported and can be shown in THICKNESS GAUGE FOR THE MEASUREMENT OF THIN FOILS
The image of thickness, described image includes a thickness curve, the reference axis and parallel with reference axis represented in different colors respectively
Boost line, and to indicate the character of the thickness curve root thickness value, coordinate scale value, thickness average value, it is special
Levy and be, comprise the following steps：
B1) detect and ensure that the film profile image is target image；Pretreatment, according in the film profile image
Color characteristic and provincial characteristics obtain the second ROI region containing the original thickness curve of target；
B2 gray processing and filtering process) are carried out to the target image of the second ROI region；
B3 discontinuous thickness curve image g1 and auxiliary dot matrix image g2) are obtained according to color component and translation specifications；
B4) to two images g1 and g2, binary image is obtained after carrying out Otsu Threshold segmentations and Double Thresholding Segmentation respectively
G1 ' and g2 '；
B5) by g1 ' and g2 ', the two mutually merges one continuous whole and achiasmate thickness curve image g of generation；
B6) based on the root thickness value in acquired film profile image, coordinate scale value, thickness average value, to institute
Each point on thickness curve is generated, is corresponding thickness value by its pixel coordinate conversion in the picture.
Using the solution of the present invention, compared with prior art, with advantages below：The present invention is thin applied to BOPP productions
Film thickness On-line Control, the film profile picture signal in collection digital display equipment, analyzes and processes the real-time thickness for obtaining film in real time
Parameter is spent, the real time automatic detection to film thickness is realized, effectively prevent artificial misjudgment；It can be accurately positioned simultaneously each
Thickness value position, the transverse gage uniformity and longitudinal thickness uniformity of BOPP film are realized by feedback control, is improved
Finished film quality.
Brief description of the drawings
Fig. 1 is the structural representation of thickness control system of the present invention；
Fig. 2 is thickness IMAQ structural representation in the present invention；
Fig. 3 is marking modular structure partial schematic diagram in the present invention；
Fig. 4 is BOPP film thickness control schematic flow sheet in the present invention；
Fig. 5 is calibrator display interfaces figure on BOPP production lines；
Fig. 6 obtains identification schematic diagram for film profile image in the present invention；
Fig. 7 splits flow chart for the character picture of character extracting sub-module in the present invention；
Fig. 8 is the conglutination segmentation process chart of character extracting sub-module in the present invention；
Fig. 9 is the template matches flow chart of character extracting sub-module in the present invention；
Figure 10 is the feature extraction schematic diagram of character extracting sub-module in the present invention；
Figure 11 is the multi-template matching process chart of character extracting sub-module in the present invention；
Figure 12 is the adhesion character separation and binaryzation schematic diagram of character extracting sub-module in the present invention；
Figure 13 is the extraction aim curve data flowchart of thickness data extracting sub-module in the present invention；
Figure 14 splits schematic diagram for the gradient threshold of thickness data extracting sub-module in the present invention；
Figure 15 is the thickness curve comparison figure of thickness data extracting sub-module in the present invention；
Figure 16 carries out the result of extract real-time for thickness data extracting sub-module in the present invention to film thickness.
Embodiment
The preferred embodiments of the present invention are described in detail below in conjunction with accompanying drawing, but the present invention is not restricted to these
Embodiment.The present invention covers any replacement made in the spirit and scope of the present invention, modification, equivalent method and scheme.
Thoroughly understand in order that the public has to the present invention, be described in detail in present invention below preferred embodiment specific
Details, and description without these details can also understand the present invention completely for a person skilled in the art.
The present invention is more specifically described by way of example referring to the drawings in the following passage.It should be noted that, accompanying drawing is adopted
With more simplified form and using non-accurately ratio, only to convenience, the embodiment of the present invention is lucidly aided in illustrating
Purpose.
As shown in figure 1, thickness control system of the present invention includes：Unit 1 is extruded, unit 2, draw unit 3 is cooled and shaped, surveys
Thick unit, monitoring and controlling unit 5 and rolling unit 6, wherein extrusion unit 1 includes extruder 7, have die head 8 in extruder front end,
Draw unit 3 includes vertical drawing-die block 9 and horizontal drawing-die block 10, and thickness measuring unit then includes the first calibrator 401 and the second calibrator
402, monitoring and controlling unit 5 include digital display equipment 11, thickness image pickup model 12, image processing module 13, control module 14,
Die head adjuster 15 and frequency converter 16.
Film raw material is extruded from melting after the dog-house input of extruder 7 for melt from die head 8, then through being cooled and shaped unit
2 are cured as slab, and slab drawn unit 3 is stretched as after wide volume film being received and kept as parent roll by rolling unit 6, subsequently will by order
Ask and parent roll is cut and packed.Because thickness plays vital effect to product quality, therefore, in BOPP film life
Often are carried out by thickness and is monitored in real time for slab and wide volume film respectively with two calibrators in production, two calibrators press particular bin
Formula is to supporting controller output thickness data, while they are also connected with digital display equipment to show slab or the wide section for rolling up film
Thickness chart picture, but calibrator can not customize the thickness data outwards exported.Above to the first of slab thickness measuring in two calibrators
Calibrator 401 is used when being pulled out at the beginning of film, when just pause is used after the second calibrator 402 input below.
With reference to shown in Fig. 1~2, thickness information is generated as film profile by the first calibrator 401 and the second calibrator 402
The image is sent to digital display equipment 11 after image and is transferred to image processing module 13 through thickness image pickup model 12.As
It is preferred that, digital display equipment 11 can also be VGA Splitter 112 and 113 including two VGA signal distributors, and they respectively will
The VGA signals that first calibrator 401, the second calibrator 402 issue digital display equipment 11 carry out being divided into two-way, all the way for display
111 use, and are used all the way for the collection of thickness image pickup units 12.The display can be two independent displays or one
The timesharing of platform display is shown to two-way VGA signals.
With reference to shown in Fig. 1, Fig. 3, die head 8 includes forming lip 801, lip aperture between two lips 800 up and down, lips
Size is adjusted by transversely arranged heat bolts 802.Being cooled and shaped unit 2 includes the modules such as sharp cooling roll 201, main air knife 202,
The melt of extrusion is left after the lips 800 of die head, and under the external force effect of the main grade of air knife 202, low temperature, best bright finish are attached to rapidly
Sharp cooling roll 201 on, melt is cooled rapidly and forms solid sheet.Along in melt direction of advance, the front of main air knife 202
One marking unit 900 is set, marking marking is carried out in slab by it.
Preferably, the marking unit 900 includes the support 901 for being fixed on frame 100, and marking module 903.It is described
Marking module 903 is using laser ablation module or the auxiliary air knife module matched with main air knife.Mark the die impression of unit 900
Block 903 includes an imprint head, and the imprint head forms V-arrangement or the U-shaped breach marking in the slab of fast cooling shaping.
Preferably, the marking module is set to two, their imprint head respectively with die head both ends bolt position phase
It is fixed, it can such as cause the bolt centerline at imprint head pedestal or its reference position and first or second, both ends along lip
Vertical line aligns and strict fixed, its reference position is shifted in a lateral direction.
Preferably, a marking module can also only be set, but one and die lips are set on marking unit 900
Parallel guide rail 902, the imprint head of marking module 903 can have multiple and die head spiral shell along along this guide rail transverse shifting, and the guide rail
Bolt has the anchor point of fixed position relation, so as to form V-arrangement or U-shaped breach print on multiple default lateral attitudes of slab
Note.
With reference to shown in Fig. 1 and Fig. 4, the BOPP film thickness control flow of thickness control system of the present invention is：
(L1) after melt extrusion, marking unit forms V-arrangement or the U-shaped breach marking on the default lateral attitude of slab,
Slab before the stretching after Thickness sensitivity is carried out by calibrator, generate film profile image；
(L2) the thickness image pickup model in monitoring and controlling unit is after digital display equipment collection film profile image, by scheming
As processing module carries out Treatment Analysis to the image, the film profile thickness value set for being marked with diebolt position is obtained；
(L3) to each element of described thickness value set, k-th of data is taken, its thickness value and product thickness are preset
Value is compared acquisition point deviation, and the value send the controller 2 of control module, PID control is carried out by controller 2, output control
Amount adjusts the dutycycle of this bolt heating waveform by die head adjuster, so as to adjust the aperture of this section of die lips；
(L4) to the thickness value set obtained in L2, calculate film profile thickness average value in this cycle, by its with
Product thickness preset value is compared acquisition this cycle integral thickness deviation, and the value send the controller 1 of control module, by controlling
Device 1 carries out PID control, and output control amount regulation frequency converter changes extruder rotating speed, so that it is overall in the unit interval to adjust die head
Interior extrusion flow is extruded velocity；
(L5) wait next cycle to be timed to come, return to step L2.
In above control process, thickness deviation is converted to temperature compensation value by controller 2, by die head adjuster to account for
The mode of empty ratio controls the break-make of solid-state relay on computer heating control passage, so as to control the temperature of current diebolt.By
In the expansion and contraction property of metal, the gap compression of slab lip, the film thickness of such slab lip when heater is turned on
It can be gradually reduced, it is on the contrary then increase.
Controller 1 is periodically averaged to laterally upper film thickness data, is converted as unit time extrusion capacity, with production
The corresponding extrusion capacity of product thickness setting value compares, and draws extrusion capacity deviation, then is transformed into motor speed compensation rate, by changing
The input quantity of frequency converter controls the rotating speed of main extruder.When motor speed increase, the melt flow of extruder die head lip
Film integral thickness after increase, pressure increase, corresponding slab and stretching can gradually increase.
During thickness control, image processing module wants output token to have the film profile thickness value collection of diebolt position
Close, the film profile image of its foundation, its content includes：Thickness curve, the reference axis represented in different colors respectively
The boost line parallel with reference axis, and it is average to indicate the thickness curve root thickness value, coordinate scale value, thickness
The character of value.
Image processing module in thickness control system of the present invention, it includes character extracting sub-module and thickness data are extracted
Submodule, the two submodules the former obtained from the film profile image root thickness value of thickness curve in image, seat
Marking angle value, thickness average value；The latter is then based on these numerical value, and extracted from image one it is continuous whole and without intersection
Thickness curve after, be corresponding thickness value by its pixel coordinate conversion in the picture to each point on the curve, and root
Positioning of the diebolt on curve is obtained according to the extreme point of the curve.
As shown in figure 5, thickness information is generated as VGA picture signals by calibrator is transferred to display, the image is probably
Multiple thickness scans and obtained the accumulation of primitive curve, as shown in Figure 5 a, and wherein the M1 and M2 regions of both sides are thin-film width direction
The thick area at two ends, this region needs clamped when being stretched and is cut off after having stretched.When in slab mark V-arrangement or
During the U-shaped breach marking, the thickness curve in profile image will appear from the extreme point as shown in P in figure.
After width volume film is by opposite side, the profile image that calibrator is scanned as shown in Figure 5 b, during the image is also Fig. 5 a
Image block between M1 and M2 regions.In this image, there are two width curve maps and some character informations respectively；Wherein, a-quadrant
Represent that the longitudinal coordinate of coordinate system in the corresponding thickness a reference value 35.5um of film thickness profile axis of abscissas and curve picture is carved
Angle value 5%；The target thickness curve of current film profile is is stated in C regions, and its reference axis is set by the description of a-quadrant,
Also contain the boost line parallel with reference axis in coordinate system；AVG=35.51um refers to working as shown by C region curves in B regions
The thickness average value of preceding film profile, R=2.83% is then the statistics extreme difference value fluctuated above and below curve.Shown due to calibrator
Picture has these Block Characteristics, therefore, a pretreatment unit is set in image processing module, it is according to the film gathered
Color characteristic and provincial characteristics in profile image data are the character extracting sub-module, thickness data extracting sub-module is distinguished
Obtain the first ROI region and the second ROI region；Wherein, the first ROI region is a-quadrant and B regions, and the second ROI region is then
C regions.
With reference to shown in Fig. 6~12, the process step that character extracting sub-module is used is as follows：
A1) detect and ensure that the film profile image is target image；Pretreatment, according in the film profile image
Color characteristic and provincial characteristics obtain the first ROI region containing target character；
A2 the binaryzation feature templates storehouse of character) is built according to the character analysis being likely to occur in the first ROI region；
A3 the first acquired ROI region) is directed to, single character is isolated in detection, and feature extraction is carried out to each character
After carry out template matches, identify single character；
A4) adjacent monocase is combined, the phrase being combined into is recognized, described image Central Plains thickness is obtained bent
Root thickness value, coordinate scale value, the thickness average value of line.
As shown in fig. 6, monitoring and controlling unit obtains identification signal to film profile image in thickness control system of the present invention
Figure, first passes through thickness image pickup model and signal is detected, then obtain image, by itself and the progress pair of standard film thickness image
Than whether both a range of RGB component features near pixel (0,0) of detection approach, and illustrate currently to adopt if if
The image integrated is target interface image；Otherwise prospect just is extracted using background subtraction method, judges foreground image in pixel again
A range of RGB component feature near (0,0), it is target interface image that the prospect is thought if the image that is near the mark, no
Then prompting is opened or the output image of calibrator is switched into target interface image, i.e., interface image as shown in Figure 5 b.
In order to obtain single character, as shown in fig. 7, when between bottom profiled on character when sticking together, due to each character
Width is the same, therefore orients character initial position to character connected domain progress rim detection first, wide in each character
The upper-lower height of single adhesion character picture is determined in the range of degree, cyclic search is partitioned into single character picture successively.
Referring to Fig. 8, wherein, as shown in Figure 8 a, it is partitioned into after single character picture, character is first oriented based on rim detection
Marginal position, reapplies scanning above and below being carried out in the wide rule of character and determines single character.Calculate whole adhesion characters
Total length l, if pending adhesion character grey image be h (i, j), by taking 5 Characters Stucks as an example, each character duration phase
It is d=l/5 Deng, its value, then bottom profiled, which is most worth, on character to be that traversal search meets character grey threshold value in the range of d in width
Character data, obtains each character height maximum and minimum value.It can be divided according to the most value difference of each character height and width
The character minimum rectangle figure is cut out, as shown in Figure 8 b.
As shown in figure 9, carrying out the processing such as binaryzation to it after single character picture is partitioned into, respective symbols size is returned
One changes, and is allowed to identical with the character boundary in the matching template set up in advance.
Character feature vector is extracted based on characteristic method pixel-by-pixel, as shown in Figure 10, character picture is divided into the small of 3*3=9
Non-zero pixels point number in block, scope of statistics, then the feature on calculated level and the bisector intersection point of vertical direction 3, have 13
Individual characteristic value, by this record in array.
With reference to shown in Fig. 9,10, to the monocase image after normalization, non-zero pixel in single character is counted, is stored into
In the matrix of definition；Then, its corresponding characteristic vector is extracted, the characteristic value of itself and the regional of Character mother plate is compared
Compared with match cognization goes out character to be measured.
In order to improve character recognition robustness, contour feature is introduced on the basis of self-defined gray feature template.As schemed
Shown in 11, to each single character, matched after extracting its user-defined feature vector with template character characteristic vector, calculate it
Matching degree：
In formula, PiFor the characteristic value of i-th of template character, it is defined as i.e. 13 feature models of 13 characteristic values of this character
The sum of non-zero pixels point number in enclosing；PkFor the characteristic value of k-th of character to be identified.
To k-th of character to be identified, when there is template character of the matching degree more than 0.6, by the character recognition for wherein
Matching degree highest template character；Otherwise, user-defined feature vector is replaced using Hu squares contour feature, repeats said process,
Match cognization is carried out after calculating matching degree.When target interface image is fetched correctly, all characters can be recognized accurately.
It is the separation to adhesion character and binaryzation schematic diagram as shown in figure 12, wherein Figure 12 a are the separation of adhesion character,
Figure 12 b are the binary image of monocase.Accurate segmentation has been carried out to character as seen from the figure, then carried out by template matches
Identification.By single character, heuristically rule is combined into phrase and carries out matching identification with default phrase template, obtains such as
The thickness a reference value of a-quadrant, the thickness average value of coordinate scale value and B regions and statistics extreme difference value in image shown in Fig. 3.In figure
It show the longitudinal coordinate scale value Range=5% identified.
With reference to shown in Figure 13~16, the process step that thickness data extracting sub-module is used is as follows：
B1) detect and ensure that the film profile image is target image；Pretreatment, according in the film profile image
Color characteristic and provincial characteristics obtain the second ROI region containing the original thickness curve of target；
B2 gray processing and filtering process) are carried out to the target image of the second ROI region；
B3 discontinuous thickness curve image g1 and auxiliary dot matrix image g2) are obtained according to color component and translation specifications；
B4) to two images g1 and g2, binary image is obtained after carrying out Otsu Threshold segmentations and Double Thresholding Segmentation respectively
G1 ' and g2 '；
B5) by g1 ' and g2 ', the two mutually merges one continuous whole and achiasmate thickness curve image g of generation；
B6 the root thickness value obtained in the film profile image, coordinate scale value, thickness) are extracted by character average
Value, is corresponding by its pixel coordinate conversion in the picture to each point on generated thickness curve based on these data
Thickness value.
Because thickness curve is a kind of color, coordinate and coordinate boost line are other colors, if carried out to target image
Traditional Threshold segmentation, the thickness curve extracted there will be substantial amounts of making-breaking point, it is impossible to obtain the thickness that film is all cutd open
Value.Therefore, being that curve is set up respectively with curve with reference axis and coordinate boost line in itself in preprocessing process as shown in figure 13
Two groups of RGB features are threshold range or color component rule, will respectively obtain discontinuous thickness curve image g1 and auxiliary dot matrix
Two images of image g2；Then to they carry out gradient threshold segmentations after merge, will obtain one it is continuous whole and achiasmate
Thickness curve image.
In subsequent thickness data analyzing and processing, the root thickness value based on the acquisition of character extracting sub-module, seat
Marking angle value, thickness average value, are by the following method right by its pixel coordinate conversion in the picture to each point on curve
The thickness value answered：
ti=tJ+(m_y-m_y0)/w*1% (2)
R=(max (m_y)-min (m_y))/w*1% (4)
In formula, tJOn the basis of be worth, tiFor the corresponding thickness value of each pixel, m_y is its pixel ordinate, m_y0For horizontal stroke
The pixel ordinate of reference axis, N is the pixel total number extracted, and w is long for every 1% scale on ordinate direction in curve image
Corresponding number of pixels.
It is as shown in figure 14 the gradient threshold segmentation schematic diagram of thickness data extracting sub-module, wherein, Figure 14 a are second
The target image of ROI region, Figure 14 b are that middle thickness curve image g1, Figure 14 c for having discontinuous point is positioned at reference axis and coordinate
Auxiliary dot matrix image g2, Figure 14 d and 14e in boost line is to carry out Otsu Threshold segmentations and Double Thresholding Segmentation respectively to g1 and g2
After obtain binary image g1 ' and g2 ', Figure 14 f are the two is generated after mutually merging by g1 ' and g2 ' thickness curve image g.
Wherein, color component is characterized as obtaining based on B component, by RGB component weighted sum；And dual threshold is then by such as
Lower step is calculated.First, to target image, segmentation threshold tg1 is taken by Otsu threshold methods so that image g1 target and background two
Gray value variance between individual region is maximum；Then, to image g2, the gray value of all pixels less than tg1 is counted respectively
Average tg2 and all pixels more than tg1 gray value average tg3, the tg1 and tg3 are split to image g2
Dual threshold.
It is thickness curve comparison figure as shown in figure 15, wherein, Figure 15 a are by an actual (real) thickness curve with extracting curve
Comparison diagram, Figure 15 b are Figure 15 a partial enlarged drawing.It can be seen that extracted curve and original thickness curve co-insides degree are non-
Chang Gao.
Figure 16 gives the present invention and carries out the film thickness that monitoring is obtained in real time to the film profile depth information shown in Fig. 3
Data, wherein thickness average are used as control input signal with thickness value, and thickness extreme difference value is then one and is used as aid prompting
Index.In terms of the relative deviation of real data and data measured, thickness average difference 0.28%, thickness extreme difference value difference
1.77%, the degree of accuracy is very high, fully meets requirement of engineering.
Using similar procedure, film profile image is carried out sentencing knowledge or handled, detect the extreme point of thickness curve and right
The two ends diebolt fixed with marking module imprint head relative position is positioned on curve, then by the pixel positioned
Location application obtains the film profile thickness value collection for being marked with diebolt position in real time into trimming rear film profile image
Close.These thickness values are conveyed to controller 1 and controller 2 in control module, the aperture control of die lips is carried out and squeezes
Go out speed control, realize the transverse gage high uniformity of film production and cause longitudinal thickness to keep high uniformity.
In addition, although embodiment is separately illustrated and illustrated above, but it is related to the common technology in part, in this area
Those of ordinary skill apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and record is not known
Content, then refer to another embodiment on the books.
Embodiments described above, does not constitute the restriction to the technical scheme protection domain.It is any in above-mentioned implementation
Modifications, equivalent substitutions and improvements made within the spirit and principle of mode etc., should be included in the protection model of the technical scheme
Within enclosing.
Claims (8)
1. a kind of film thickness monitoring system, it includes extrusion unit, is cooled and shaped unit, draw unit, thickness measuring unit, monitoring and controlling
Unit and rolling unit, the extrusion unit include extruder and die head, and the draw unit includes vertical drawing-die block and horizontal drawing-die
Block, the thickness measuring unit includes the first calibrator and the second calibrator, and film raw material melt is after extruder extrusion through being cooled to
Type unit is cured as slab, and it is parent roll, described first that slab drawn unit, which is stretched as after wide volume film by rolling unit harvesting,
Calibrator and the second calibrator are located at draw unit two ends and carry out thickness monitor, its feature to the slab and wide volume film respectively
It is：
The cooling and shaping unit includes a marking module, and the monitoring and controlling unit includes digital display equipment, thickness image and picked up
Modulus block, image processing module, control module, die head adjuster and frequency converter, first calibrator and the second calibrator are equal
Thickness information is generated as after film profile image sending the image to digital display equipment and transferred through thickness image pickup model
To image processing module, the control module passes through frequency converter and mould respectively after receiving the thickness data of image processing module output
The aperture of head adjuster control extruder rotating speed and die head.
2. a kind of film thickness monitoring system according to claim 1, it is characterised in that：The film profile image document includes
A thickness curve, reference axis and the boost line parallel with reference axis represented in different colors respectively, and to indicate
State thickness curve root thickness value, coordinate scale value, the character of thickness average value；The thickness number of described image processing module output
According to be marked with the film profile thickness value set of diebolt position.
3. a kind of film thickness monitoring system according to claim 1, it is characterised in that：The cooling and shaping unit includes Quench
Roller and main air knife, the marking unit are arranged on the front of the main air knife for being attached to film raw material melt on sharp cooling roll, should
Marking unit includes the marking module that two its imprint heads are mutually fixedly connected with die head both ends bolt position respectively；The marking
Unit is using laser ablation module or the auxiliary air knife module matched with main air knife, and the marking unit forms V in slab
Shape or the U-shaped breach marking.
4. a kind of film thickness monitoring system according to claim 1, it is characterised in that：The cooling and shaping unit includes Quench
Roller and main air knife, the marking unit are arranged on the front of the main air knife for being attached to film raw material melt on sharp cooling roll, should
Marking unit includes a guide rail parallel with die lips and a marking module, and the marking module can edge including one
There is multiple and diebolt to have the anchor point of fixed position relation on the imprint head of the guide rail movement, the guide rail；It is described to carve
Impression member is formed using laser ablation module or the auxiliary air knife module matched with main air knife, and the marking unit in slab
V-arrangement or the U-shaped breach marking.
5. a kind of film thickness monitoring system according to claim 1, it is characterised in that：The digital display equipment include display and
VGA signal distributors, the VGA signal distributors receive VGA signals from calibrator and signal are distributed into display and described
Thickness image pickup model.
6. a kind of film thickness monitoring system according to claim 1, it is characterised in that：The control module includes controller 1
With controller 2, the controller 2 controls the logical of diebolt solid-state relay by way of die head adjuster is with dutycycle
It is disconnected, so that the aperture of die head section where the bolt is adjusted by controlling the temperature of bolt, to realize film corresponding to the bolt
The thickness regulation of section；The controller 1 controls the rotating speed of extruder in the way of adjusting frequency converter, so as to be squeezed by control
Output realizes the regulation of film ensemble average thickness.
7. a kind of character extracting method of film profile image, handled image is exported and can be shown in THICKNESS GAUGE FOR THE MEASUREMENT OF THIN FOILS
The image of the horizontal section thickness to show detected film on one display, described image is included respectively in different colors
A thickness curve, reference axis and the boost line parallel with reference axis represented, and to indicate the thickness curve benchmark
Thickness value, coordinate scale value, the character of thickness average value, it is characterised in that comprise the following steps：
A1) detect and ensure that the film profile image is target image；Pretreatment, according to the face in the film profile image
Color characteristic and provincial characteristics obtain the first ROI region containing target character；
A2 the binaryzation feature templates storehouse of character) is built according to the character analysis being likely to occur in the first ROI region；
A3 the first acquired ROI region) is directed to, single character is isolated in detection, it is laggard to carry out feature extraction to each character
Row template matches, identify single character；
A4) adjacent monocase is combined, the phrase being combined into is recognized, described image Central Plains thickness curve is obtained
Root thickness value, coordinate scale value, thickness average value.
8. a kind of thickness acquisition method of film profile image, handled image is exported and can be shown in THICKNESS GAUGE FOR THE MEASUREMENT OF THIN FOILS
The image of the horizontal section thickness to show detected film on one display, described image is included respectively in different colors
A thickness curve, reference axis and the boost line parallel with reference axis represented, and to indicate the thickness curve benchmark
Thickness value, coordinate scale value, the character of thickness average value, it is characterised in that comprise the following steps：
B1) detect and ensure that the film profile image is target image；Pretreatment, according to the face in the film profile image
Color characteristic and provincial characteristics obtain the second ROI region containing the original thickness curve of target；
B2 gray processing and filtering process) are carried out to the target image of the second ROI region；
B3 discontinuous thickness curve image g1 and auxiliary dot matrix image g2) are obtained according to color component and translation specifications；
B4) to two images g1 and g2, carry out obtaining after Otsu Threshold segmentations and Double Thresholding Segmentation respectively binary image g1 ' and
g2′；
B5) by g1 ' and g2 ', the two mutually merges one continuous whole and achiasmate thickness curve image g of generation；
B6) based on the root thickness value in acquired film profile image, coordinate scale value, thickness average value, to being generated
Each point on thickness curve, is corresponding thickness value by its pixel coordinate conversion in the picture.
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| CN201710429716.7A CN107310173B (en) | 2017-05-28 | 2017-05-28 | The character of film thickness monitoring system and film profile image extracts and film thickness acquisition method |
| CN201910845717.9A CN110667146B (en) | 2017-05-28 | 2017-05-28 | Film thickness acquisition method of film section image |
| CN201910845719.8A CN110667148B (en) | 2017-05-28 | 2017-05-28 | Film thickness control system |
| CN201910845718.3A CN110667147B (en) | 2017-05-28 | 2017-05-28 | Character extraction method for film section image |
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| CN201910845717.9A Division CN110667146B (en) | 2017-05-28 | 2017-05-28 | Film thickness acquisition method of film section image |
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| CN112793198A (en) * | 2021-04-09 | 2021-05-14 | 山东国维复合材料科技有限公司 | Film forming method and system |
| CN112936924A (en) * | 2019-12-10 | 2021-06-11 | 财团法人纺织产业综合研究所 | Apparatus and method for manufacturing plastic film |
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| CN112285067A (en) * | 2020-10-22 | 2021-01-29 | 山东卓俊实业有限公司 | Method for preparing high-uniformity sample film |
| CN112934588A (en) * | 2021-02-01 | 2021-06-11 | 夏前兵 | Automatic processing system for surface texture of stone-like coating |
| CN115170572B (en) * | 2022-09-08 | 2022-11-08 | 山东瑞峰新材料科技有限公司 | BOPP composite film surface gluing quality monitoring method |
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| JPH0957815A (en) * | 1995-08-25 | 1997-03-04 | Tonen Chem Corp | Thickness controlling method for oriented polymer sheet |
| US5928580A (en) * | 1995-12-15 | 1999-07-27 | Toshiba Machine Co., Ltd. | Method of controlling a thickness of a film |
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| CN112793198B (en) * | 2021-04-09 | 2021-07-02 | 山东国维复合材料科技有限公司 | Film forming method and system |
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| CN110667148A (en) | 2020-01-10 |
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| CN107310173B (en) | 2019-09-24 |
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Application publication date: 20171103 Assignee: Xinchang neodymium Ru Agricultural Technology Co.,Ltd. Assignor: China Jiliang University Contract record no.: X2023330000134 Denomination of invention: Film Thickness Control System and Character Extraction and Film Thickness Acquisition Methods for Film Profile Images Granted publication date: 20190924 License type: Common License Record date: 20230311 Application publication date: 20171103 Assignee: Xinchang Huandi Technology Co.,Ltd. Assignor: China Jiliang University Contract record no.: X2023330000130 Denomination of invention: Film Thickness Control System and Character Extraction and Film Thickness Acquisition Methods for Film Profile Images Granted publication date: 20190924 License type: Common License Record date: 20230311 Application publication date: 20171103 Assignee: Shaoxing Jienan Technology Co.,Ltd. Assignor: China Jiliang University Contract record no.: X2023330000128 Denomination of invention: Film Thickness Control System and Character Extraction and Film Thickness Acquisition Methods for Film Profile Images Granted publication date: 20190924 License type: Common License Record date: 20230311 Application publication date: 20171103 Assignee: Xinchang County niukan Agricultural Development Co.,Ltd. Assignor: China Jiliang University Contract record no.: X2023330000132 Denomination of invention: Film Thickness Control System and Character Extraction and Film Thickness Acquisition Methods for Film Profile Images Granted publication date: 20190924 License type: Common License Record date: 20230311 |
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Application publication date: 20171103 Assignee: Shaoxing Yuanyi Technology Co.,Ltd. Assignor: China Jiliang University Contract record no.: X2023330000202 Denomination of invention: Character Extraction and Film Thickness Collection Method for Film Thickness Control System and Film Profile Image Granted publication date: 20190924 License type: Common License Record date: 20230329 Application publication date: 20171103 Assignee: Xinchang County facheng Agricultural Development Co.,Ltd. Assignor: China Jiliang University Contract record no.: X2023330000203 Denomination of invention: Character Extraction and Film Thickness Collection Method for Film Thickness Control System and Film Profile Image Granted publication date: 20190924 License type: Common License Record date: 20230329 Application publication date: 20171103 Assignee: XINCHANG COUNTY XIAOBUDIAN AGRICULTURAL DEVELOPMENT Co.,Ltd. Assignor: China Jiliang University Contract record no.: X2023330000201 Denomination of invention: Character Extraction and Film Thickness Collection Method for Film Thickness Control System and Film Profile Image Granted publication date: 20190924 License type: Common License Record date: 20230329 Application publication date: 20171103 Assignee: Xinchang Daochong Pet Products Co.,Ltd. Assignor: China Jiliang University Contract record no.: X2023330000204 Denomination of invention: Character Extraction and Film Thickness Collection Method for Film Thickness Control System and Film Profile Image Granted publication date: 20190924 License type: Common License Record date: 20230329 |
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