CN111578850A - Measuring method for visually measuring thickness of raised fabric - Google Patents
Measuring method for visually measuring thickness of raised fabric Download PDFInfo
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- CN111578850A CN111578850A CN202010363254.5A CN202010363254A CN111578850A CN 111578850 A CN111578850 A CN 111578850A CN 202010363254 A CN202010363254 A CN 202010363254A CN 111578850 A CN111578850 A CN 111578850A
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- 239000004744 fabric Substances 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000001514 detection method Methods 0.000 claims abstract description 17
- 238000012545 processing Methods 0.000 claims abstract description 8
- 230000007246 mechanism Effects 0.000 claims description 34
- 230000005540 biological transmission Effects 0.000 claims description 30
- 238000010586 diagram Methods 0.000 claims description 11
- 230000000877 morphologic effect Effects 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 9
- 238000003708 edge detection Methods 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 238000002474 experimental method Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 230000008878 coupling Effects 0.000 description 8
- 238000010168 coupling process Methods 0.000 description 8
- 238000005859 coupling reaction Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
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- 238000007781 pre-processing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/40—Extraction of image or video features
- G06V10/44—Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersections; Connectivity analysis, e.g. of connected components
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Abstract
The invention discloses a method for measuring the thickness of a napped fabric by vision, which comprises the following steps of firstly, before the napped fabric is not covered on a driving roller, acquiring a section image of the driving roller by a machine vision system, and taking the section image as a reference. And then, paving the detected fluff fabric on a driving roller to obtain a tangential image of the fluff fabric. And finally, processing the image in a computer, acquiring a thickness reference line and a contour line of the upper edge of the fluff, extracting coordinates of the thickness reference line and the contour line of the upper edge of the fluff according to a chain code principle, and finally performing subtraction operation on the thickness reference line and the contour line of the upper edge of the fluff to obtain a thickness value of the fluff. The method can improve the objectivity of the detection result of the thickness of the pile fabric and provide technical support for automation and high efficiency of surface quality detection of the pile fabric in the future.
Description
Technical Field
The invention belongs to the technical field of machine vision, and relates to a method for measuring the thickness of a napped fabric by vision.
Background
After the fabric is subjected to the fuzzing processes of napping, sanding, brushing and the like, soft and compact fuzz is generated on the surface of the fabric. The pile fabric has the advantages of strong heat retention, strong light shading and the like, so the pile fabric is widely applied to textiles such as clothes, blankets, toys and the like. At present, the thickness measurement method of the pile fabric usually adopts manual detection as a main part, and inspectors evaluate the height of the pile through senses such as hand feeling, vision and the like by means of working experience for many years. However, the manual detection has a great disadvantage that the manual detection has high requirements on detection personnel, and the detection personnel have to accumulate experience for a long time to have the capability of evaluating the quality of the fabric. Secondly, the subjective nature of manual evaluation is strong, and different people detecting the same fabric may result in different results.
The machine vision replaces human eyes to finish the detection of the surface state of the textile, the measurement precision is high, the speed is high, the visual detection problem under the complex environment is successfully solved, a humanized production mode is provided to protect the health of workers, and the machine vision becomes an important means and an inevitable trend for ensuring the product quality of each enterprise.
Disclosure of Invention
The invention aims to provide a method for measuring the thickness of a napped fabric by vision, which solves the problem of vision detection in a complex environment in the prior art.
The technical scheme adopted by the invention is that the measuring method for visually measuring the thickness of the napped fabric is implemented according to the following steps:
and 5, multiplying the thickness value of the pile fabric obtained in the step 4 by the object plane resolution obtained in the step 1 to obtain a product which is the real thickness of the pile fabric.
The invention is also characterized in that:
the experimental platform in the step 1 is a non-contact cut pile fabric thickness detection device, which comprises a support a and a plurality of supports b, wherein the support a is connected with two long supports, a horizontal support is fixedly connected between the two long supports, the horizontal support is connected with a cloud deck, the supports b are fixedly connected with two short supports, the long supports are fixedly connected with conveyor belt supports, the conveyor belt supports are fixedly connected with the short supports, the cloud deck is connected with an industrial camera, the industrial camera is connected with a computer through a data line, a transmission roller mechanism is fixedly connected between the two long supports, the transmission roller mechanism is connected with a stepping motor, the stepping motor is electrically connected with a power supply, a first support roller mechanism is arranged between the two conveyor belt supports, a second support roller mechanism and a transmission roller mechanism are arranged between the ends of the two conveyor belt, the first supporting roller mechanism and the second supporting roller mechanism are provided with conveyor belts to work in a matching way;
the driving roller mechanism comprises a bearing clamping seat, a bearing seat and a driving roller, the bearing clamping seat and the bearing seat are respectively and fixedly connected with two long supports, a through hole is formed in the bearing clamping seat, a bearing is arranged in the through hole, a round hole is formed in the bearing seat, the bearing is arranged in the round hole, the driving roller penetrates through one end part of the bearing in the through hole and is connected with the stepping motor, the other end part of the driving roller is inserted into the round hole and is connected with the bearing, and the conveying belt is arranged on the;
one end of an output shaft of the stepping motor is provided with a coupling driving roller, and the coupling is fixedly connected with the bearing clamping seat;
the first support roller mechanism comprises a bearing seat support, the bearing seat support is connected to the conveyor belt support, the side wall of the bearing seat support is fixedly connected with a bearing seat, a first support roller is arranged between the two bearing seats, bearings are arranged in circular holes of the two bearing seats and movably connected with the two ends of the first support roller, and the conveyor belt is arranged on the surface of the first support roller;
the second supporting roller mechanism comprises two bearing seats, a second supporting roller is arranged between the two bearing seats, bearings are arranged in circular holes of the two bearing seats and connected with two ends of the second supporting roller, the two bearing seats are vertically and fixedly connected with a conveyor belt bracket, and the conveyor belt is arranged on the surface of the second supporting roller;
a strip-shaped LED light source is arranged on one side of the support a and is positioned right below the transmission roller;
the horizontal bracket and the holder are fixedly connected, slidably connected or detachably connected;
the cloud platform is provided with the fixed industry camera of camera fixed plate of L type.
The wall surface of the bearing seat support connected with the bearing seat is provided with a sliding groove, the bearing seat is provided with a screw hole, a bolt is inserted in the screw hole, one end of the bolt is fixed in the sliding groove, and the other end of the bolt is sleeved with a nut to fix the bearing seat;
the support a and support b, support b and long support, long support and horizontal stand, support b and short support, long support and conveyer belt support, the conveyer belt support is fixed with the junction between short support, bearing support and the conveyer belt support is provided with the corner fittings.
The calibration of the steps is implemented according to the following steps: and placing the standard gauge block right below the industrial camera, keeping the standard gauge block at the same height as the axis of the transmission roller, keeping the bar-shaped LED light source at the same lighting effect as the fluff fabric image acquisition mode, shooting the standard gauge block image, and obtaining the object plane resolution K in a computer.
The calibration of step 1 is carried out according to the following steps: and placing the standard gauge block right below the industrial camera, keeping the standard gauge block at the same height as the axis of the transmission roller, keeping the bar-shaped LED light source at the same lighting effect as the fluff fabric image acquisition type, shooting the standard gauge block image, and obtaining the object plane resolution in a computer.
The step 2 is implemented according to the following steps:
step 2.1, performing graying, filtering, binarization, morphological algorithm and other treatment on the fluff fabric tangential diagram obtained in the step 1, removing impurities in the image, thinning the edge of the fluff image, and filling fluff holes to obtain a clear fluff fabric contour image;
step 2.2, carrying out graying, filtering, binarization, morphological algorithm and other processing on the tangential image of the outer contour of the transmission roller obtained in the step 1 to obtain an edge characteristic image of the transmission roller and a background;
and 2.3, performing edge detection on the contour image of the pile fabric and the contour image of the pile thickness reference line obtained in the steps 2.1 and 2.2 by adopting a Canny operator to obtain a pile upper edge contour characteristic image and a pile thickness reference line image.
step 3.1, respectively marking the contour edges of the contour feature image of the upper edge of the fluff and the contour edge of the fluff thickness reference line image as M multiplied by N and generating a 0 matrix of (M +2, N +2) for surrounding the edge contour to form an 8-field image;
step 3.2, searching for the coordinate with the first pixel being 1, establishing a starting point of the first searching direction, then searching for the other 7 directions, searching for the coordinate with the next pixel being 1, searching globally, and recording the current coordinate;
and 3.3, stopping calculation and returning the coordinate values when the rest 7 directions are all 0.
The step 4 is specifically implemented according to the following steps:
obtaining a fluff upper edge contour curve l under a coordinate system by utilizing matlab fitting on the coordinate values obtained in the step 31Reference line l of fluff thickness2Subtracting to obtain a fluff thickness variation curve L, wherein the expression is
L＝l1-l2(1)。
The step 5 is specifically implemented according to the following steps:
contour curve l of upper edge of pile1Is g (x, y), fluff thickness datum line l2Is t (x, y), thenThe hair thickness curve L (x, y) is
L(x,y)＝|g(x,y)-t(x,y)| (2)
Average thickness of fluff
Is given by the formula
In the formula, n is the number of edge points, and K is the object plane resolution; i is a row label in the matrix.
The invention has the beneficial effects that: the method can improve the objectivity of the detection result of the thickness of the pile fabric and provide technical support for automation and high efficiency of surface quality detection of the pile fabric in the future.
Drawings
FIG. 1 is a flow chart of a method of visually measuring the caliper of a pile fabric according to the present invention;
FIG. 2 is a tangential scan of a method of measuring pile fabric thickness according to the present invention;
FIG. 3 is a thickness measurement schematic of the pile fabric surface thickness measurement of a method of measuring pile fabric thickness visually in accordance with the present invention;
FIG. 4 is a schematic diagram of an edge profile tracking algorithm for a method of visually measuring pile fabric thickness according to the present invention;
FIG. 5 is a schematic view of the attachment of the stand of the experimental platform for a method of measuring the thickness of a pile fabric according to the present invention;
FIG. 6 is a schematic structural diagram of an experimental platform of a measuring method for visually measuring the thickness of a pile fabric according to the present invention;
FIG. 7 is a top plan view of an experimental platform for a method of visually measuring the caliper of a pile fabric according to the present invention;
FIG. 8 is a schematic structural diagram of a camera fixing plate of an experiment platform for a method for measuring the thickness of a pile fabric by vision
FIG. 9 is a schematic structural diagram of a first supporting roller mechanism of an experimental platform for a measuring method for visually measuring the thickness of a pile fabric according to the present invention;
FIG. 10 is a schematic view of a bearing seat structure of an experimental platform for a measuring method for visually measuring the thickness of a pile fabric according to the present invention;
FIG. 11 is a schematic diagram of a coupling structure of an experimental platform for a measuring method for visually measuring the thickness of a pile fabric according to the present invention;
FIG. 12 is a schematic structural diagram of a bearing clamping seat of an experimental platform for a measuring method for visually measuring the thickness of a pile fabric according to the invention;
in the figure, 1, a tripod head, 2, an industrial camera, 2-1, a camera fixing plate, 3, a stepping motor, 4, a coupler, 5, a bearing clamping seat, 6, a transmission roller, 7, a first supporting roller, 8, a bearing seat, 9, a conveyor belt, 10, a second supporting roller, 11, a bearing, 12, a strip-shaped LED light source, 13, an angle piece, 14, a support a, 15, a long support, 16, a horizontal support, 17, a support b, 18, a short support, 19, a bearing seat support, 20, a conveyor belt support, 21, a transmission roller mechanism, 22, a first supporting roller mechanism and 23, a second supporting roller mechanism.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings and the detailed description
The invention discloses a measuring method for visually measuring the thickness of a pile fabric, which is implemented according to the following steps as shown in figure 1:
and 5, multiplying the thickness value of the pile fabric obtained in the step 4 by the object plane resolution obtained in the step 1 to obtain a product which is the real thickness of the pile fabric.
The calibration of step 1 is carried out according to the following steps: the standard gauge block is placed under the industrial camera 2 and is as high as the axis of the driving roller 6, so that the strip-shaped LED light source 12 is kept in the same illuminating effect as the fluff fabric image acquisition mode, the standard gauge block image is shot, and the object plane resolution is obtained in a computer.
The step 2 is implemented according to the following steps:
step 2.1, performing graying, filtering, binarization, morphological algorithm and other treatment on the fluff fabric tangential diagram obtained in the step 1, removing impurities in the image, thinning the edge of the fluff image, and filling fluff holes to obtain a clear fluff fabric contour image;
step 2.2, processing the tangential image of the outer contour of the transmission roller obtained in the step 1 by graying, filtering, binarization, morphological algorithm and the like to obtain an edge characteristic image of the transmission roller and a background, and taking a dividing line between the transmission roller and the background as a reference line for evaluating the thickness of the fluff;
and 2.3, performing edge detection on the contour image of the pile fabric and the contour image of the pile thickness reference line obtained in the steps 2.1 and 2.2 by adopting a Canny operator to obtain a pile upper edge contour characteristic image and a pile thickness reference line image.
The contour edge feature is used as a fabric thickness calculation to perform feature extraction on the axial surface contour edge and the fabric contour edge, and an edge contour tracking algorithm based on chain codes is designed and developed, as shown in fig. 4. Extracting edge characteristics of the fluff area by adopting a chain code principle, wherein the step 3 is implemented according to the following steps:
step 3.1, respectively marking the contour edges of the contour feature image of the upper edge of the fluff and the contour edge of the fluff thickness reference line image as M multiplied by N and generating a 0 matrix of (M +2, N +2) for surrounding the edge contour to form an 8-field image;
step 3.2, searching for the coordinate with the first pixel being 1, establishing a starting point of the first searching direction, then searching for the other 7 directions, searching for the coordinate with the next pixel being 1, searching globally, and recording the current coordinate;
and 3.3, stopping calculation and returning the coordinate values when the rest 7 directions are all 0.
The step 4 is specifically implemented according to the following steps:
obtaining a fluff upper edge contour curve l under a coordinate system by utilizing matlab fitting on the coordinate values obtained in the step 31Reference line l of fluff thickness2Subtracting to obtain a fluff thickness variation curve L, wherein the expression is
L＝l1-l2(1)。
The step 5 is specifically implemented according to the following steps:
contour curve l of upper edge of pile1Is g (x, y), fluff thickness datum line l2T (x, y), the fluff thickness variation curve L (x, y) is
L(x,y)＝|g(x,y)-t(x,y)| (2)
Average thickness of fluff
Is given by the formula
In the formula, n is the number of edge points, and K is the object plane resolution; i is a row mark in the matrix and is represented by an average thickness
The thickness of the pile area is characterized, and the larger the value is, the thicker the pile area is, and vice versa, the thinner the pile area is.
A non-contact type cut pile fabric thickness shooting device is structurally shown in figure 5 and comprises a support a14 and a plurality of supports b14-1, wherein the support a14 is connected with two long supports 15, a horizontal support 16 is fixedly connected between the two long supports 15, the horizontal support 16 is connected with a holder 1, the support b17 is fixedly connected with two short supports 18, the long support 15 is fixedly connected with a conveyor belt support 20, the conveyor belt support 20 is fixedly connected with the short supports 18, and as shown in figure 7, an industrial camera 2 is connected to the holder 1 so as to obtain tangential images of cut pile fabrics.
As shown in fig. 6, a transmission roller mechanism 21 is fixedly connected between the two long brackets 15, the transmission roller mechanism 21 is connected with a stepping motor 3, the stepping motor 3 is electrically connected with a power supply, a first support roller mechanism 22 is arranged between the two conveyor belt brackets 20, a second support roller mechanism 23 is arranged between the ends of the two conveyor belt brackets 20 far away from the long brackets 15, and the transmission roller mechanism 21, the first support roller mechanism 22 and the second support roller mechanism 23 are provided with conveyor belts 9 for cooperation.
Drive roller mechanism 21 is including bearing cassette 5, bearing frame 8 and driving roller 6, two long support 15 of bearing cassette 5 and bearing frame 8 fixed connection respectively, the through-hole has been seted up on the bearing cassette 5, be provided with bearing 11 in the through-hole, as shown in fig. 10, the round hole has been seted up on the bearing frame 8, be provided with bearing 11 in the round hole, driving roller 6 passes the one end tip of bearing 11 in the through-hole and is connected with step motor 3, 6 other end tip of driving roller insert the round hole in be connected with bearing 11, conveyer belt 9 sets up on driving roller 6 surface.
One end of an output shaft of the stepping motor 3 is provided with a coupling 4 driving transmission roller 6, and the coupling 4 is fixedly connected with the bearing clamping seat 5. The rotating speed of the stepping motor 3 is adjustable, and the cut pile fabric images can be acquired at various speeds by adjusting the belt speed of the conveyor belt 9.
The coupler 4 is used for mounting and driving the stepping motor 3 and plays a role in supporting the stepping motor 3. The device design is well structure of leading to, and the purpose is wherein placing a shaft coupling 4, can guarantee that motor shaft and initiative driving roll axle have stable gyration performance, and the device satisfies the diaxon and is in same axle center moreover, and the shaft coupling adopts the screw connection, guarantees its intensity and stability.
First supporting roller mechanism 22 is including bearing frame support 19, and bearing frame support 19 connects on conveyer belt support 20, and the lateral wall fixedly connected with bearing frame 8 of bearing frame support 19 is provided with first supporting roller 7 between two bearing frames 8, is provided with bearing 11 and first supporting roller 7 both ends swing joint in the round hole of two bearing frames 8, and conveyer belt 9 sets up on first supporting roller 7 surface.
The second supporting roller mechanism 21 comprises two bearing seats 8, a second supporting roller 10 is arranged between the two bearing seats 8, bearings 11 are arranged in circular holes of the two bearing seats 8 and connected with two ends of the second supporting roller 10, the two bearing seats 8 are vertically and fixedly connected with a conveyor belt support 20, and a conveyor belt 9 is arranged on the surface of the second supporting roller 10.
The first support roller 7 is located at a quarter distance between the driving roller 6 and the second support roller 10, and the conveyor belt 9 is disposed on the three rollers for moving the fabric.
Fig. 10 is a device for connecting the motor support base and the bracket. Fig. 12 is mainly used for fixing a driven roller and the like, and the device has a supporting function for a deep groove ball bearing installed in the device and can ensure the coaxiality of a driving transmission roller shaft and a motor rotating shaft.
The strip-shaped LED light source 12 is arranged on one side of the support a14, the strip-shaped LED light source 12 is positioned right below the driving roller 6, and the optical center of the camera coincides with the vertical tangent plane on the outer side of the driving roller 6.
The horizontal bracket 16 and the holder 1 are fixedly connected, slidably connected or detachably connected.
As shown in fig. 11 and 12, the pan/tilt head 1 is provided with an L-shaped camera fixing plate 2-1 for fixing the industrial camera 2.
As shown in fig. 9, a sliding groove is formed on a wall surface of the bearing seat support 19, which is connected to the bearing seat 8, a screw hole is formed in the bearing seat 8, a bolt is inserted into the screw hole, one end of the bolt is fixed in the sliding groove, and the other end of the bolt is sleeved with a nut to fix the bearing seat 8.
The height of the first supporting roller 7 can be adjusted by moving the bearing seat 8 at the corresponding position up and down, so that the tension on the surface of the cut pile fabric at the position of the driving roller 6 is controlled, the bolt is loosened, the bolt moves up and down in the sliding groove, the bolt is screwed up after the bolt moves to a proper position, and the adjustment of the upper position and the lower position of the bearing seat 8 is completed.
The joints between the support a14 and the support b14-1, between the support b14-1 and the long support 15, between the long support 15 and the horizontal support 16, between the support b17 and the short support 18, between the long support 15 and the conveyor belt support 20, and between the conveyor belt support 20 and the short support 18, and between the support bracket 19 and the conveyor belt support 20 are fixed by corner fittings 13.
A non-contact cut pile fabric thickness detection device comprises the following working processes:
electric drive step motor 3 rotates, drive driving roller 6 through shaft coupling 4 and rotate, driving roller 6 drives first backing roll 7 through conveyer belt 9, the second backing roll rotates 10, the fabric of will cutting the fine hair covers on conveyer belt 9 this moment, the fabric of cutting the fine hair passes through conveyer belt 9 and removes, simultaneously, industry camera 2 gathers the image of cutting the fine hair that is located driving roller 6 tangential region, and will cut the fine hair image and store in passing through the data line conveying to the computer.
The measuring method for visually measuring the thickness of the raised fabric obtains a driving roller tangent diagram and a fluff contour tangent diagram by a tangential imaging principle. And preprocessing the fluff image to improve the contrast of the image. According to the gray histogram characteristics of the fluff area, the fluff area is divided by adopting a maximum inter-class variance method, linear structural elements are constructed for defects such as holes and discontinuity existing in the divided fluff area, and the opening and closing operation is carried out by a morphological method, so that a complete fluff upper edge contour line is obtained. And meanwhile, processing a tangent plane figure of the driving roller, highlighting the tangent plane outline of the driving roller to obtain a parting line of the driving roller and the shooting background, and taking the parting line as a reference line for evaluating the thickness of the pile fabric. And extracting the coordinate of the datum line and the coordinate of the outline of the fluff by using an edge outline tracking algorithm based on the chain code to obtain a thickness datum line and an outline curve of the upper edge of the fluff. And finally, carrying out subtraction operation on the fluff to obtain a fluff thickness value. The method can improve the objectivity of the detection result of the thickness of the pile fabric and provide technical support for automation and high efficiency of surface quality detection of the pile fabric in the future.
Claims (7)
1. A measuring method for visually measuring the thickness of a pile fabric is characterized by comprising the following steps:
step 1, building an experiment platform and calibrating a machine vision system to obtain an object plane resolution K; acquiring an outer contour tangential image of the driving roller through a machine vision system, and temporarily storing the outer contour tangential image in a computer; then the pile fabric is placed on a conveyor belt, and the collected pile fabric tangent pattern is temporarily stored in a computer;
step 2, graying, filtering, binaryzation, morphological processing and edge detection are carried out on the tangential image of the outer contour of the driving roller and the tangential image of the fluff fabric obtained in the step 1 to obtain a fluff thickness reference line image and a fluff upper edge contour characteristic image;
step 3, extracting edge coordinate values of the image of the pile thickness reference line and the image of the pile upper edge contour feature obtained in the step 2 through a chain code principle to obtain a pile thickness reference line and a pile upper edge contour curve;
step 4, obtaining a thickness value of the pile fabric by using the pile thickness datum line obtained in the step 3 and a coordinate value of the pile upper edge contour curve and adopting a thickness measurement principle;
and 5, multiplying the thickness value of the pile fabric obtained in the step 4 by the object plane resolution obtained in the step 1 to obtain a product which is the real thickness of the pile fabric.
2. The method for measuring the thickness of the napped fabric visually according to claim 1, wherein the experimental platform in step 1 is a non-contact cut-pile fabric thickness detection device comprising a support a (14) and a plurality of supports b (14-1), the support a (14) is connected with two long supports (15), a horizontal support (16) is fixedly connected between the two long supports (15), the horizontal support (16) is connected with the pan-tilt (1), the support b (17) is fixedly connected with two short supports (18), the long support (15) is fixedly connected with a conveyor belt support (20), the conveyor belt support (20) is fixedly connected with the short supports (18), the pan-tilt (1) is connected with an industrial camera (2), the industrial camera is connected with a computer through a data line, and a transmission roller mechanism (21) is fixedly connected between the two long supports (15), the transmission roller mechanism (21) is connected with a stepping motor (3), the stepping motor (3) is electrically connected with a power supply, a first supporting roller mechanism (22) is arranged between the two conveyor belt supports (20), a second supporting roller mechanism (23) is arranged between the ends, far away from the long support (15), of the two conveyor belt supports (20), and the transmission roller mechanism (21), the first supporting roller mechanism (22) and the second supporting roller mechanism (23) are provided with conveyor belts (9) to work in a matched mode;
the transmission roller mechanism (21) comprises a bearing clamping seat (5), a bearing seat (8) and a transmission roller (6), the bearing clamping seat (5) and the bearing seat (8) are respectively and fixedly connected with two long supports (15), a through hole is formed in the bearing clamping seat (5), a bearing (11) is arranged in the through hole, a round hole is formed in the bearing seat (8), the bearing (11) is arranged in the round hole, the transmission roller (6) penetrates through one end part of the bearing (11) in the through hole to be connected with the stepping motor (3), the other end part of the transmission roller (6) is inserted into the round hole to be connected with the bearing (11), and the conveyor belt (9) is arranged on the surface of the transmission roller (6);
one end of an output shaft of the stepping motor (3) is provided with a coupler (4) to drive a transmission roller (6), and the coupler (4) is fixedly connected with a bearing clamping seat (5);
the first supporting roller mechanism (22) comprises a bearing seat support (19), the bearing seat support (19) is connected to a conveyor belt support (20), bearing seats (8) are fixedly connected to the side wall of the bearing seat support (19), a first supporting roller (7) is arranged between the two bearing seats (8), bearings (11) are arranged in circular holes of the two bearing seats (8) and movably connected with the two ends of the first supporting roller (7), and the conveyor belt (9) is arranged on the surface of the first supporting roller (7);
the second supporting roller mechanism (21) comprises two bearing seats (8), a second supporting roller (10) is arranged between the two bearing seats (8), bearings (11) are arranged in circular holes of the two bearing seats (8) and connected with two ends of the second supporting roller (10), the two bearing seats (8) are vertically and fixedly connected with a conveyor belt bracket (20), and a conveyor belt (9) is arranged on the surface of the second supporting roller (10);
a strip-shaped LED light source (12) is arranged on one side of the support a (14), and the strip-shaped LED light source (12) is positioned right below the transmission roller 6;
the horizontal support (16) and the holder (1) are fixedly connected, slidably connected or detachably connected;
the cloud platform (1) is provided with an L-shaped camera fixing plate (2-1) for fixing the industrial camera (2).
A sliding groove is formed in the wall surface, connected with the bearing seat (8), of the bearing seat support (19), a screw hole is formed in the bearing seat (8), a bolt is inserted into the screw hole, one end of the bolt is fixed in the sliding groove, and a nut is sleeved at the other end of the bolt to fix the bearing seat (8);
the conveyor belt supporting device is characterized in that corner pieces (13) are arranged at the joints of the support seat a (14) and the support seat b (14-1), the support seat b (14-1) and the long support (15), the long support (15) and the horizontal support (16), the support seat b (17) and the short support (18), the long support (15) and the conveyor belt support (20), and the conveyor belt support (20) and the short support (18), the support seat support (19) and the conveyor belt support (20) for fixation.
3. A method for visually measuring the thickness of a pile fabric according to claim 2, wherein the calibration of step 1 is carried out according to the following steps: the standard gauge block is placed under the industrial camera (2) and is as high as the axis of the driving roller (6), so that the strip-shaped LED light source (12) is kept in the same illuminating effect as the fluff fabric image acquisition mode, the standard gauge block image is shot, and the object plane resolution K is obtained in a computer.
4. A method for visually measuring the thickness of a pile fabric according to claim 3, wherein step 2 is carried out in particular according to the following steps:
step 2.1, performing graying, filtering, binarization, morphological algorithm and other treatment on the fluff fabric tangential diagram obtained in the step 1, removing impurities in the image, thinning the edge of the fluff image, and filling fluff holes to obtain a clear fluff fabric contour image;
step 2.2, carrying out graying, filtering, binarization, morphological algorithm and other processing on the tangential image of the outer contour of the transmission roller obtained in the step 1 to obtain an edge characteristic image of the transmission roller and a background;
and 2.3, performing edge detection on the contour image of the pile fabric and the contour image of the pile thickness reference line obtained in the steps 2.1 and 2.2 by adopting a Canny operator to obtain a pile upper edge contour characteristic image and a pile thickness reference line image.
5. A method for visually measuring the thickness of a pile fabric according to claim 4, wherein step 3 is carried out in particular according to the following steps:
step 3.1, respectively marking the contour edges of the contour feature image of the upper edge of the fluff and the contour edge of the fluff thickness reference line image as M multiplied by N and generating a 0 matrix of (M +2, N +2) for surrounding the edge contour to form an 8-field image;
step 3.2, searching for the coordinate with the first pixel being 1, establishing a starting point of the first searching direction, then searching for the other 7 directions, searching for the coordinate with the next pixel being 1, searching globally, and recording the current coordinate;
and 3.3, stopping calculation and returning the coordinate values when the rest 7 directions are all 0.
6. A method for visually measuring the thickness of a pile fabric according to claim 5, wherein step 4 is carried out in particular according to the following steps: obtaining a fluff upper edge contour curve l under a coordinate system by utilizing matlab fitting on the coordinate values obtained in the step 31Reference line l of fluff thickness2Subtracting to obtain a fluff thickness variation curve L, wherein the expression is
L＝l1-l2(1)。
7. A method for visually measuring the thickness of a pile fabric according to claim 6, wherein step 5 is carried out in particular according to the following steps:
contour curve l of upper edge of pile1Is g (x, y), fluff thickness datum line l2T (x, y), the fluff thickness variation curve L (x, y) is
L(x,y)＝|g(x,y)-t(x,y)| (2)
Average thickness of fluff
Is given by the formula
In the formula, n is the number of edge points, and K is the object plane resolution; i is a row label in the matrix.
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