CN107310173B - The character of film thickness monitoring system and film profile image extracts and film thickness acquisition method - Google Patents
The character of film thickness monitoring system and film profile image extracts and film thickness acquisition method Download PDFInfo
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- CN107310173B CN107310173B CN201710429716.7A CN201710429716A CN107310173B CN 107310173 B CN107310173 B CN 107310173B CN 201710429716 A CN201710429716 A CN 201710429716A CN 107310173 B CN107310173 B CN 107310173B
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- 238000012544 monitoring process Methods 0.000 title abstract description 18
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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
Abstract
The invention discloses the characters of a kind of film thickness monitoring system and film profile image to extract and film thickness acquisition method, film thickness monitoring system includes squeezing out unit, being cooled and shaped unit, draw unit, thickness measuring unit, monitoring control unit and rolling unit, it is wherein cooled and shaped unit and includes marking module, monitoring in control unit has digital display equipment, film thickness image pickup model, image processing module, control module, die head adjuster and frequency converter.Thickness measuring unit detection film thickness simultaneously sends film profile image to digital display equipment, and image processing module is transferred to through film thickness image pickup model, the label 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.The present invention acquires film profile picture signal in real time, and analysis handles to obtain thickness parameter, is adjusted by the thickness that diebolt carries out section, reaches the uniform purpose of film transverse gage, while be consistent film longitudinal thickness by the adjusting of extruded velocity.
Description
Technical field
The present invention relates to film fabrication techniques fields, and in particular to the word of a kind of film thickness monitoring system and film profile image
Symbol extracts and film thickness acquisition method.
Background technique
BOPP film, that is, 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 process.BOPP production line is non-linear, a time-varying, the complexity postponed greatly
System.Its process flow specifically include that raw material melting, extrusion, cooling and shaping, longitudinal stretching, cross directional stretch, trimming, at corona
It manages, batch.
Physical mechanical property such as tensile strength, elongation at break, turbidity, gloss as BOPP film product quality indicator
Deng because depending mainly on the attribute of material itself, so all easily reaching requirement.And as the main of re-workability and service 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
For plastics thickness control in the deviation range that standard allows, but after the winding of thousands of tunics is accumulative, thickness deviation is big in the process
Position on may form the bad defects such as hoop, sudden and violent muscle or chase, the reprocessing that these defects directly influence user uses,
Such as phenomena such as the dislocation of color printing chromatography or gluing irregular corrugation, it is made to 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 affects
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 technique.Such as application No. is
2014201577223 Chinese patent by X-ray scanning obtain film thickness after, be respectively adopted two PID regulators come into
The control of the horizontal and vertical thickness of row film.Similar method is also used application No. is 2007201517097 Chinese patent,
It points out simultaneously, in order to obtain film in homogeneous thickness, it is necessary to realize that thickness measurements and measurement position are accurately positioned.Application
Number for 2015102638543 Chinese patent then by being compared point to the thickness value that measures and preset thickness value
Analysis adjusts the extrusion output at extruder die head, to realize that the uniformity for squeezing out composite membrane longitudinal thickness is adjusted.
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 equipment often by specific format.Calibrator service life generally compares
It is long many to control equipment, when controlling device fails or damage and be not available, domestic manufacturing firm or both expensive
Cost is replaced from external import or with domestic control equipment.Even if also must first solve one with the replacement of domestic control equipment
A problem obtains accurate thickness data from former calibrator.In face of this problem, some current producers can only use open loop control
System carries out personal monitoring to the sectional thickness image of calibrator output over the display, then rule of thumb after operation replacement
Control equipment be adjusted.
This personal monitoring and adjusting are not only inaccurate, can not also stablize.Due to lacking to the continuous accurate of film thickness
Monitoring, the quality of film product suffer from influence.For this purpose, being badly in need of solving to monitor film thickness on-line automaticization and control
Transformation.
On the other hand, for example widely applied recording instrument without paper of many integrated instrument equipment, radar asorbing paint instrument etc. are traditional
Equipment with display terminal mostly uses specific format to carry out data transmission and store.To these equipment, if its display can be acquired
The reference format signal of device input terminal such as VGA signal, is analyzed and processed image expressed by the signal, obtains its original object
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.
Summary of the invention
In view of this, can calibrator display input signals be acquired and be divided the purpose of the present invention is to provide a kind of
Analysis processing, obtains and exports original physical value corresponding to the signal i.e. film thickness value set, while each thickness can be accurately positioned
It is worth the system of corresponding die head position, and passes through the control of extruder die head lip aperture and extruded velocity control according to these data
To produce BOPP film the automatic control for carrying out film thickness, to reach the uniform of film thickness.Meanwhile the present invention also provides
The character that thickness value is extracted from the film profile image of calibrator extracts and film thickness acquisition method.
The technical solution of the invention is as follows, provides a kind of film thickness monitoring system with flowering structure, including squeezes out unit, cold
But forming unit, draw unit, thickness measuring unit, monitoring control unit and rolling unit,
The extrusion unit includes extruder and die head, and the draw unit includes indulging drawing-die block and horizontal drawing-die block, described
Thickness measuring unit includes the first calibrator and the second calibrator, and it is solid that film raw material melt is cooled and shaped unit after extruder extrusion
Turn to slab, slab drawn unit is stretched as after wide volume film being parent roll by rolling unit harvesting, first calibrator and
Second calibrator is located at draw unit both ends and carries out thickness monitor to the slab and wide volume film, it is characterised in that:
The cooling and shaping unit includes a marking module, and the monitoring control unit includes digital display equipment, film 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 film thickness image pickup model by instrument
It is transferred to image processing module, the control module passes through frequency converter after receiving the film thickness data that image processing module exports respectively
With the aperture of die head adjuster control extruder revolving speed and die head.
Preferably, the film profile image document includes the film thickness curve indicated in different colors respectively, sits
Parameter and the auxiliary line parallel with reference axis, and to indicate the film thickness curve root thickness value, coordinate scale value, thickness
The character of average value；The film 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 setting is being used to incite 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 setting is being used to incite somebody to action
Film raw material melt is attached to the front of the main air knife on sharp cooling roll, which includes a guide rail parallel with die lips
And a marking module, the marking module includes the imprint head that can be moved along the guide rail, is had on the guide rail more
A anchor point for having fixed positional relationship with diebolt；The marking unit using laser ablation module or with main air knife phase
The auxiliary air knife module matched, 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 distributor, the VGA signal distributor is from survey
Thick instrument receives VGA signal and signal is distributed to display and the film thickness image pickup model.
Preferably, the control module includes controller 1 and controller 2, the controller 2 by die head adjuster with
The mode of duty ratio controls the on-off of diebolt solid-state relay, to adjust the bolt by the temperature for controlling bolt
The aperture of place die head section, to realize that the thickness of film section corresponding to the bolt is adjusted；The controller 1 is to adjust frequency converter
Mode control the revolving speed of extruder, to realize the adjusting of film ensemble average thickness by control extrusion output.
Another technical solution of the invention is to provide a kind of character extracting method of film profile image, locating for
The image of reason is to be exported with THICKNESS GAUGE FOR THE MEASUREMENT OF THIN FOILS and can be shown in the horizontal section to show detected film on a display
The image of thickness, described image include the film thickness curve indicated in different colors respectively, reference axis and parallel with reference axis
Auxiliary line, and the character to indicate the film thickness curve root thickness value, coordinate scale value, thickness average value is special
Sign is, includes the following steps:
A1 it) detects and ensures 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) according to the binaryzation feature templates library for the character analysis building character being likely to occur in the first ROI region；
A3 it) is directed to the first acquired ROI region, single character is isolated in detection, carries out feature extraction to each character
After carry out template matching, identify single character；
A4) adjacent monocase is combined, the phrase being combined into is recognized, it is bent to obtain described image Central Plains film thickness
Root thickness value, the coordinate scale value, thickness average value of line.
Another technical solution of the invention is to provide a kind of film thickness acquisition method of film profile image, locating
The image of reason is to be exported with THICKNESS GAUGE FOR THE MEASUREMENT OF THIN FOILS and can be shown in the horizontal section to show detected film on a display
The image of thickness, described image include the film thickness curve indicated in different colors respectively, reference axis and parallel with reference axis
Auxiliary line, and the character to indicate the film thickness curve root thickness value, coordinate scale value, thickness average value is special
Sign is, includes the following steps:
B1 it) detects and ensures 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 film thickness curve of target；
B2 gray processing and filtering processing) are carried out to the target image of the second ROI region；
B3 discontinuous film 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 segmentation and Double Thresholding Segmentation respectively
G1 ' and g2 '；
B5 g1 ' is mutually merged with g2 ' the two) and generates a continuous whole and achiasmate film thickness curve image g；
B6) based on root thickness value, the coordinate scale value, thickness average value in acquired film profile image, to institute
Each point on film 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, have the advantage that the present invention is applied to the thin of BOPP production
Film thickness On-line Control, acquires the film profile picture signal in digital display equipment in real time, and analysis handles to obtain the real-time thickness of film
Parameter is spent, the real time automatic detection to film thickness is realized, effectively prevents artificially judging incorrectly；It can be accurately positioned simultaneously each
Thickness value position is realized the transverse gage uniformity and longitudinal thickness consistency of BOPP film by feedback control, improved
Film product quality.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of film thickness control system of the present invention；
Fig. 2 is film thickness Image Acquisition structural schematic diagram in the present invention；
Fig. 3 is that modular structure partial schematic diagram is marked in the present invention；
Fig. 4 is BOPP film thickness control flow diagram in the present invention；
Fig. 5 is calibrator display interfaces figure on BOPP production line；
Fig. 6 is that film profile image obtains identification schematic diagram in the present invention；
Fig. 7 is that the character picture of character extracting sub-module in the present invention divides flow chart；
Fig. 8 is the conglutination segmentation process flow diagram of character extracting sub-module in the present invention；
Fig. 9 is the template matching 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 flow diagram 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 film thickness data extracting sub-module in the present invention；
Figure 14 is that the gradient threshold of film thickness data extracting sub-module in the present invention divides schematic diagram；
Figure 15 is the film thickness curve comparison figure of film thickness data extracting sub-module in the present invention；
Figure 16 is the result that film thickness data extracting sub-module carries out extract real-time to film thickness in the present invention.
Specific embodiment
The preferred embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention is not restricted to these
Embodiment.The present invention covers any substitution made in the spirit and scope of the present invention, modification, equivalent method and scheme.
In order to make the public have thorough understanding to the present invention, it is described in detail in the following preferred embodiment of the present invention specific
Details, and the present invention can also be understood completely in description without these details for a person skilled in the art.
The present invention is more specifically described by way of example referring to attached drawing in the following passage.It should be noted that attached drawing is adopted
With more simplified form and using non-accurate ratio, only to facilitate, lucidly aid in illustrating the embodiment of the present invention
Purpose.
As shown in Figure 1, film thickness control system of the present invention includes: to squeeze out unit 1, be cooled and shaped unit 2, draw unit 3, survey
Thick unit, monitoring control unit 5 and rolling unit 6 have die head 8 in extruder front end wherein squeezing out unit 1 includes extruder 7,
Draw unit 3 includes vertical drawing-die block 9 and horizontal drawing-die block 10, thickness measuring unit then include the first calibrator 401 and the second calibrator
402, monitoring control unit 5 include digital display equipment 11, film thickness image pickup model 12, image processing module 13, control module 14,
Die head adjuster 15 and frequency converter 16.
Film raw material squeezes out for melt from die head 8 from melting after the feeding port of extruder 7 investment, then through being cooled and shaped unit
2 are cured as slab, and slab drawn unit 3 is stretched as after wide volume film by the harvesting of rolling unit 6 being parent roll, subsequent to want by order
It asks and parent roll is cut and is packed.Since thickness plays a crucial role product quality, it is raw in BOPP film
Thickness real-time monitoring often is carried out to slab and wide volume film respectively with two calibrators in production, two calibrators press particular bin
Formula is to mating controller output thickness data, while they are also connected with digital display equipment to show the section of slab or wide volume film
Thickness image, but calibrator can not customize the thickness data exported outward.Front is to the first of slab thickness measuring in two calibrators
Calibrator 401 is used in pull-out at the beginning of film, and just pause uses after the second calibrator 402 investment below.
In conjunction with 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 film thickness image pickup model 12.As
It is preferred that digital display equipment 11 can also include two VGA signal distributor, that is, VGA Splitter 112 and 113, they respectively will
The VGA signal that first calibrator 401, the second calibrator 402 issue digital display equipment 11 carries out being divided into two-way, all the way for display
111 use, and acquire use for film thickness image pickup units 12 all the way.The display can be two independent displays or one
The timesharing of platform display shows two-way VGA signal.
Referring to figs 1 and 3, die head 8 includes upper and lower two lips 800, forms lip 801, lip aperture between 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,
After the melt of extrusion leaves the lips 800 of die head, under the external force of main air knife 202 etc., it is attached to low temperature, best bright finish rapidly
Sharp cooling roll 201 on, melt is cooled rapidly and forms solid sheet.In melt direction of advance, the front of main air knife 202
One marking unit 900 is set, carries out marking marking in slab by it.
Preferably, the marking unit 900 includes the bracket 901 for being fixed on rack 100, and marking module 903.It is described
Marking module 903 is using laser ablation module or the auxiliary air knife module to match with main air knife.Mark the die impression of unit 900
Block 903 includes an imprint head, which forms V-arrangement or the U-shaped breach marking in the slab of fast cooling shaping.
Preferably, the marking module is set as two, their imprint head respectively with die head both ends bolt location phase
It is fixed, it can such as make the bolt centerline at imprint head pedestal or its base position and first or second, both ends along lip
Vertical line is aligned and strictly fixes, and shift its base position cannot in a lateral direction.
Preferably, a marking module can also only be arranged, but one and die lips are set on marking unit 900
The imprint head of parallel guide rail 902, marking module 903 can have multiple and die head spiral shell along this guide rail transverse shifting, and on the guide rail
Bolt has the anchor point of fixed positional relationship, so as to form V-arrangement or U-shaped breach print on multiple default lateral positions of slab
Note.
In conjunction with shown in Fig. 1 and Fig. 4, the BOPP film thickness control process of film thickness control system of the present invention are as follows:
(L1) after melt extrusion, marking unit forms V-arrangement or the U-shaped breach marking on the default lateral position of slab,
Slab before the stretching after Thickness sensitivity carried out by calibrator, generate film profile image；
(L2) the film thickness image pickup model in control unit is monitored after digital display equipment acquisition film profile image, by scheming
As processing module carries out processing analysis to the image, the film profile thickness value set for being marked with diebolt position is obtained；
(L3) to each element of the thickness value set, k-th of data is taken, its thickness value is preset with product thickness
Value is compared acquisition point deviation, which send the controller 2 of control module, carries out PID control, output control by controller 2
Amount adjusts the duty ratio of this bolt heating waveform by die head adjuster, 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 period, by its with
Product thickness preset value, which is compared, obtains this period integral thickness deviation, which send the controller 1 of control module, by controlling
Device 1 carries out PID control, and output control amount adjusts frequency converter, changes extruder revolving speed, so that it is whole in the unit time to adjust die head
Interior extrusion flow, that is, extruded velocity；
(L5) it waits next period to be timed to come, returns to step L2.
In the 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 on-off of solid-state relay on computer heating control channel, 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 conducting
It can be gradually reduced, it is on the contrary then increase.
Controller 1 is periodically averaged laterally upper film thickness data, converts as unit time extrusion output, with production
The corresponding extrusion output of product thickness setting value compares, and obtains extrusion output deviation, then is transformed into motor speed compensation rate, passes through change
The input quantity of frequency converter controls the revolving speed of main extruder.When motor speed increases, the melt flow of extruder die head lip
Increase, pressure increases, and the film integral thickness after 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, based on film profile image, content includes: film thickness curve, the reference axis indicated in different colors respectively
The auxiliary line parallel with reference axis, and it is average to indicate the film thickness curve root thickness value, coordinate scale value, thickness
The character of value.
Image processing module in film thickness control system of the present invention comprising character extracting sub-module and film thickness data are extracted
Submodule, the two submodules the former from the film profile image obtain image in film thickness curve root thickness value, sit
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
Film thickness curve after, be corresponding thickness value by its pixel coordinate conversion in the picture, and root to point each on the curve
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 signal by calibrator is transferred to display, which may be
Multiple thickness scans and obtains the accumulation of primitive curve, and as shown in Figure 5 a, wherein the region M1 and M2 of two sides is thin-film width direction
The thick area at both ends, this region need clamped when being stretched and are cut off after having stretched.When in slab mark V-arrangement or
When the U-shaped breach marking, the extreme point as shown in P in figure will occur in the thickness curve in profile image.
After width volume film is by opposite side, the profile image that calibrator scans is as shown in Figure 5 b, which is also in Fig. 5 a
Image block between the region M1 and M2.In this image, there are two width curve graphs and some character informations respectively；Wherein, a-quadrant
Indicate 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 region C is the target thickness curve for stating current film profile, and reference axis is set by the description of a-quadrant,
Also contain the auxiliary line parallel with reference axis in coordinate system；AVG=35.51um refers in B area works as shown by C region curve
The thickness average value of preceding film profile, R=2.83% are then the very poor values of statistics that curve fluctuates up and down.It is shown due to calibrator
Picture has these Block Characteristics, therefore, a pretreatment unit is arranged in image processing module, according to film collected
Color characteristic and provincial characteristics in profile image data are the character extracting sub-module, film thickness data extracting sub-module difference
Obtain the first ROI region and the second ROI region；Wherein, the first ROI region is a-quadrant and B area, and the second ROI region is then
The region C.
In conjunction with shown in Fig. 6~12, the processing step that character extracting sub-module uses is as follows:
A1 it) detects and ensures 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) according to the binaryzation feature templates library for the character analysis building character being likely to occur in the first ROI region；
A3 it) is directed to the first acquired ROI region, single character is isolated in detection, carries out feature extraction to each character
After carry out template matching, identify single character；
A4) adjacent monocase is combined, the phrase being combined into is recognized, it is bent to obtain described image Central Plains film thickness
Root thickness value, the coordinate scale value, thickness average value of line.
Identification signal is obtained to film profile image as shown in fig. 6, monitoring control unit in film thickness control system of the present invention
Figure, first passes through film thickness image pickup model and detects to signal, then obtain image, it is carried out with standard film thickness image pair
Than in pixel (0,0), nearby whether a certain range of RGB component feature is approached for both detections, illustrates 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 certain range of RGB component feature near (0,0) thinks that the prospect is target interface image if the image that is near the mark, no
It then prompts to open 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, between bottom profiled on character when sticking together, due to each character
Width is the same, therefore carries out edge detection to character connected domain first and orient character initial position, wide in each character
The upper-lower height that single adhesion character picture is determined in degree range, circuits sequentially search and is partitioned into single character picture.
Referring to Fig. 8, wherein as shown in Figure 8 a, after being partitioned into single character picture, first orient character based on edge detection
Marginal position reapplies to carry out scanning up and down in the wide rule of character and determines single character.Calculate whole adhesion characters
Total length l, if adhesion character grey image to be processed be h (i, j), by taking 5 Characters Stucks as an example, each character width phase
Deng, value d=l/5, then bottom profiled most value can be that traversal search meet character grey threshold value within the scope of d in width on character
Character data obtains each character height maximum value and minimum value.It can be divided according to the most value difference of each character height with 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 being partitioned into single character picture, respective symbols size is returned
One changes, and is allowed to identical as the character boundary in the matching template established in advance.
Character feature vector is extracted based on characteristic method pixel-by-pixel, and character picture is divided into the small of 3*3=9 as shown in Figure 10
Block, the non-zero pixels point number in scope of statistics, then the feature on both horizontally and vertically 3 bisector intersection points is calculated, share 13
A characteristic value, this is recorded in array.
In conjunction with 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 feature vector is extracted, the characteristic value of itself and each region 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 customized gray feature template.Such as figure
Shown in 11, to each single character, is matched after extracting its user-defined feature vector with template character feature vector, calculate it
Matching degree:
In formula, PiFor the characteristic value of i-th of template character, it is defined as 13 characteristic values i.e. 13 feature models 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.
It is wherein by the character recognition when there are the template character that matching degree is greater than 0.6 to k-th of character to be identified
The highest template character of matching degree；Otherwise, user-defined feature vector is replaced using Hu square contour feature, repeated the above 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 as shown in figure 12 separation and the binaryzation schematic diagram to adhesion character, wherein Figure 12 a is the separation of adhesion character,
Figure 12 b is the binary image of monocase.Accurate segmentation has been carried out to character as seen from the figure, has then been carried out by template matching
Identification.By single character, heuristically rule is combined into phrase and carries out matching identification with default phrase template, obtains such as
The film thickness a reference value of a-quadrant, the thickness average value of coordinate scale value and B area and the very poor value of statistics in image shown in Fig. 3.In figure
It show the longitudinal coordinate scale value Range=5% identified.
In conjunction with shown in Figure 13~16, the processing step that film thickness data extracting sub-module uses is as follows:
B1 it) detects and ensures 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 film thickness curve of target；
B2 gray processing and filtering processing) are carried out to the target image of the second ROI region；
B3 discontinuous film 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 segmentation and Double Thresholding Segmentation respectively
G1 ' and g2 '；
B5 g1 ' is mutually merged with g2 ' the two) and generates a continuous whole and achiasmate film thickness curve image g；
B6 it is average that the root thickness value, coordinate scale value, thickness obtained in the film profile image) is extracted by character
Its pixel coordinate conversion in the picture is based on these data corresponding to each point on generated film thickness curve by value
Thickness value.
Since thickness curve is a kind of color, coordinate and coordinate auxiliary line are other colors, if carried out to target image
A large amount of making-breaking point will be present in traditional Threshold segmentation, the thickness curve extracted, can not obtain the thickness that film all cuts open
Value.For this purpose, as shown in figure 13, in preprocessing process, being set up respectively for curve itself with curve and reference axis and coordinate auxiliary line
Two groups of RGB feature, that is, threshold ranges or color component rule, will respectively obtain discontinuous film 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
Film thickness curve image.
In subsequent thickness data analysis processing, the root thickness value, seat based on the acquisition of character extracting sub-module
Its pixel coordinate conversion in the picture is by the following method right to point each on curve by marking angle value, thickness average value
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 cross
The pixel ordinate of reference axis, N are the pixel total number extracted, and w is that every 1% scale is long in ordinate direction in curve image
Corresponding number of pixels.
Divide schematic diagram as shown in figure 14 for the gradient threshold of film thickness data extracting sub-module, wherein Figure 14 a is second
The target image of ROI region, Figure 14 b are that intermediate film 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 auxiliary line is to carry out Otsu Threshold segmentation and Double Thresholding Segmentation respectively to g1 and g2
After obtain binary image g1 ' and g2 ', Figure 14 f is the film thickness curve image g generated after mutually merging g1 ' with g2 ' the two.
Wherein, color component feature is to obtain based on B component, by RGB component weighted sum；And dual threshold is then pressed such as
Lower step calculates.Firstly, segmentation threshold tg1 is taken by Otsu threshold method to target image, so that the target and background two of image g1
Gray value variance between a region is maximum；Then, to image g2, the gray value of all pixels less than tg1 is counted respectively
Gray value the mean value tg3, the tg1 and tg3 of mean value tg2 and all pixels greater than tg1 are split image g2
Dual threshold.
It is as shown in figure 15 film thickness curve comparison figure, wherein Figure 15 a is by an actual (real) thickness curve and extracts curve
Comparison diagram, Figure 15 b are the partial enlarged view of Figure 15 a.It can be seen from the figure that extracted curve and original thickness curve co-insides degree are non-
Chang Gao.
Figure 16 gives the film thickness that the present invention carries out real-time monitoring acquisition to film profile depth information shown in Fig. 3
Data, wherein thickness mean value and thickness value are used as control input signal, and the very poor value of thickness is then one and is used as aid prompting
Index.In terms of from the relative deviation of real data and data measured, thickness mean value difference 0.28%, the very poor value difference of thickness
1.77%, accuracy is very high, fully meets requirement of engineering.
Using similar procedure, film profile image is carried out to sentence knowledge or processing, detects the extreme point of thickness curve and right
Fixed both ends diebolt is positioned on curve with marking module imprint head relative position, the pixel that then will be positioned
Location application obtains the film profile thickness value collection for being marked with diebolt position into trimming rear film profile image in real time
It closes.These thickness values are conveyed to controller 1 and controller 2 in control module, carry out the aperture control of die lips and are squeezed
Speed control out realizes the transverse gage high uniformity of film production and longitudinal thickness is made to keep high consistency.
In addition to this, although embodiment is separately illustrated and is illustrated above, it is related to the common technology in part, in this field
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 can refer to another embodiment on the books.
Embodiments described above does not constitute the restriction to the technical solution protection scope.It is any in above-mentioned implementation
Made modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution within the spirit and principle of mode
Within enclosing.
Claims (2)
1. 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 include distinguishing in different colors
A film thickness curve, reference axis and the auxiliary line parallel with reference axis indicated, and to indicate the film thickness curve benchmark
The character of thickness value, coordinate scale value, thickness average value, which comprises the steps of:
A1 it) detects and ensures 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) according to the binaryzation feature templates library for the character analysis building character being likely to occur in the first ROI region；
A3 it) is directed to the first acquired ROI region, single character is isolated in detection, and it is laggard to carry out feature extraction to each character
Row template matching identifies single character；
A4) adjacent monocase is combined, the phrase being combined into is recognized, obtains described image Central Plains film thickness curve
Root thickness value, coordinate scale value, thickness average value.
2. a kind of film 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 include distinguishing in different colors
A film thickness curve, reference axis and the auxiliary line parallel with reference axis indicated, and to indicate the film thickness curve benchmark
The character of thickness value, coordinate scale value, thickness average value, which comprises the steps of:
B1 it) detects and ensures 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 film thickness curve of target；
B2 gray processing and filtering processing) are carried out to the target image of the second ROI region；
B3 discontinuous film 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 segmentation and Double Thresholding Segmentation respectively binary image g1 ' and
g2′；
B5 g1 ' is mutually merged with g2 ' the two) and generates a continuous whole and achiasmate film thickness curve image g；
B6) based on root thickness value, the coordinate scale value, thickness average value in acquired film profile image, to being generated
Its pixel coordinate conversion in the picture is corresponding thickness value by each point on film thickness curve.
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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 |
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| CN104827646A (en) * | 2015-05-20 | 2015-08-12 | 江门市辉隆塑料机械有限公司 | Device and method for regulating longitudinal thickness evenness of extrusion compound film |
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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 |
| CN203766002U (en) * | 2014-04-03 | 2014-08-13 | 山东胜通集团股份有限公司 | Online thickness detection control system of polyester optical films |
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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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