CN103760162B - The multi-direction crease recovery system safety testing device of fabric and method - Google Patents
The multi-direction crease recovery system safety testing device of fabric and method Download PDFInfo
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- CN103760162B CN103760162B CN201410024076.8A CN201410024076A CN103760162B CN 103760162 B CN103760162 B CN 103760162B CN 201410024076 A CN201410024076 A CN 201410024076A CN 103760162 B CN103760162 B CN 103760162B
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Abstract
The present invention relates to the multi-direction crease recovery system safety testing device of a kind of fabric and method.Apparatus of the present invention comprise acquisition and the treating apparatus of the multi-direction wrinkling device of fabric and fabric pincher image.The inventive method is after making fabric produce multi-direction wrinkle by strapping, fabric pincher image is obtained again with scanner or digital camera, then first pre-service is carried out to the fabric pincher image obtained with computing machine by image processing techniques, comprise: coloured image gray processing, contrast enhancement processing and denoising, then wavelet analysis technology is utilized to carry out wavelet decomposition to the fabric pincher image after pre-service, and extract each layer level detail standard deviation after decomposing, vertical detail standard deviation, with diagonal detail standard deviation, and by total standard deviation in above three directions as evaluation index, the fabric that total standard deviation is large, wrinkling resistance is poor.The present invention obtains reflecting the index of wrinkle resistance in fabrics by image procossing, have accurate convenience, favorable repeatability, time saving and energy saving, save the advantages such as cost.
Description
Technical field
The invention belongs to textile garment performance test field, particularly relate to the multi-direction crease recovery system safety testing device of a kind of fabric and method.
Background technology
Wrinkle resistance refers to the ability of the scuffing that fabric opposing external force causes.Wrinkle resistance typically refers to the reply degree producing folding line under external force, is also called wrinkle (folding line) recovery.The quality of crease recovery is directly connected to outward appearance and the flatness of fabric, it is accurately tested and objective evaluation extremely important.Common method of testing has crease recovery horn cupping and wring method.The former replys angle by measuring after fabric folded exerting pressure; The latter is the compression that rotated a circle on upper and lower for fabric both sides, evaluates wrinkle grade except pressing postpone.
All there is certain problem in these two kinds of methods: the wrinkle of fabric have obvious anisotropy, crease recovery horn cupping only produces the wrinkle of single direction, and the wrinkle resistance of entire fabric is only characterized with the creasy recovery angle of fabric count both direction, obviously not there is science and rationality.Wring method produces the folding line parallel to each other along fabric along the bias direction caused when wringing out after similar clothes are washed, and namely only reflects the wrinkle performance of fabric along the bias direction.These two kinds of methods all can not characterize the comprehensive crease recovery of fabric all directions obviously.
Summary of the invention
The object of the invention is to for Problems existing in the test of above crease recovery of fabrics, provide a kind of can the proving installation of the multi-direction crease recovery of concentrated expression fabric and method of testing.
Above-mentioned technical purpose of the present invention is achieved through the following technical solutions: the multi-direction crease recovery system safety testing device of fabric, comprises acquisition and the treating apparatus of the multi-direction wrinkling device of fabric and fabric pincher image.Wherein the multi-direction wrinkling device material requested of fabric has bead and bungee, and bungee is used for tying up the fabric having wrapped up bead, is namely jointly played the effect of fabric applying from multiple different directions external force by bead and bungee, makes fabric produce divergent shape folding line; The acquisition device of fabric pincher image is digital camera or scanner, and the treating apparatus of fabric pincher image is computing machine.
After making fabric produce multi-direction wrinkle by strapping, fabric pincher image is obtained again with scanner or digital camera, then first pre-service is carried out to the fabric pincher image obtained with computing machine by image processing techniques, comprise: coloured image gray processing, contrast enhancement processing and denoising, then wavelet analysis technology is utilized to carry out wavelet decomposition to the fabric pincher image after pre-service, and extract each layer level detail standard deviation after decomposing, vertical detail standard deviation, with diagonal detail standard deviation, and by total standard deviation in above three directions as evaluation index, the fabric that total standard deviation is large, wrinkling resistance is poor.
Beneficial effect of the present invention: the wrinkling resistance that can only obtain fabric single direction for existing crease recovery of fabrics method of testing, the multi-direction comprehensive wrinkle performance of fabric can not be characterized, design a set of can the proving installation of the multi-direction crease recovery of test fabric, and obtain reflecting the index of wrinkle resistance in fabrics by image procossing, have accurate convenience, favorable repeatability, time saving and energy saving, save the advantages such as cost.
Accompanying drawing explanation
The multi-direction process for creping of Fig. 1 fabric and device vertical view;
The multi-direction process for creping of Fig. 2 fabric and device front view (FV);
Fig. 3 fabric multi-direction crease recovery wrinkle resistance proving installation;
The principle of wavelet analysis of Fig. 4 fabric pincher image.
Embodiment
By the following examples, and by reference to the accompanying drawings, technical scheme of the present invention is further described in detail.
The multi-direction wrinkling device material requested of fabric has bead, ties up with bungee, the hollow tubular etc. slightly larger than the small ball's diameter.The acquisition device of fabric pincher image is digital camera or scanner, and the treating apparatus of fabric pincher image is computing machine, and the bead wherein in the present embodiment is the spheroid of diameter 1.5 centimetres.
Wrinkle resistance in fabrics method of testing of the present invention comprises the following steps:
(1) fabric 1 to be measured is pressed smooth after, be cut into given size (in the present embodiment, sample is of a size of 15 × 15cm); And put on broadwise mark 2 and warp-wise mark 3;
(2) fabric to be measured 1 after cutting is placed on the upper surface of hollow steel pipe 4, and bead 5 is put in the center of square ones, be i.e. the point of intersection of mark line 2 and 3, as shown in Figure 1;
(3) move up the bungee 6 at the outer wall place (distance coboundary 1 centimeters) being enclosed within hollow steel pipe 4, fabric 1 is made evenly to wrap bead 2 by the movement of bungee 6, with bungee 6, the fabric encasing bead is tied up solid again, that notes every block fabric ties up number of turns unification, namely by bead and bungee, the effect from multiple different directions external force is applied to fabric, make fabric produce divergent shape folding line and make fabric produce the radial folding line dispersed to surrounding by center;
(4) after tying up the set time (the present embodiment is 2 minutes), with scissors, bungee is cut off, and by light gesture of trying one's best, fabric is spread out;
(5) wrinkle fabric is put into scanner 7 to scan, when noting scanning, do not have pressure to make fabric pincher produce distortion;
(6) to the wrinkle image input computing machine 8 after scanning, and following pre-service is carried out:
The first step, becomes unified size by the image cropping obtained, and coloured image is converted into gray level image.
Second step, strengthens picture contrast.Adopt the contrast of method to image of grey linear transformation to strengthen dynamically, the tonal range of image can be made dynamically to strengthen, and the contrast of image is effectively expanded, and makes image more clear, and concrete steps are:
1. draw the histogram of gray level image, observed the intensity profile situation of image by histogram, determine the gray level range needing conversion;
2. utilize the contrast of the method stretching image of linear transformation, namely change the intensity profile scope of image, outstanding interested region, suppresses uninterested region, shows the image after linear transformation.
3. image denoising.Select the noise that the method for wavelet packet denoising suppresses in image, this kind of method can remove the high-frequency information that noise also can retain image.
(7) wavelet analysis technology is used pretreated fabric pincher image to be carried out to the decomposition of the different number of plies, as shown in Figure 4, the principle of wavelet analysis is that picture breakdown is become low frequency and HFS, wherein low frequency part reflects the principal character of image, and HFS can not represent the details of image, Fig. 4 (a) represents fabric pincher image, Fig. 4 (b) represents through one deck wavelet decomposition, cA is approximation coefficient, it represents the low-frequency component of horizontal and vertical directions, its excess-three sub-image is detail coefficients, wherein cH1 is level detail coefficient, represent the radio-frequency component of horizontal direction and the low-frequency component of vertical direction, cV1 is vertical detail coefficient, represents the radio-frequency component of vertical direction and the low-frequency component of horizontal direction, cD1 is diagonal detail coefficient, represents the radio-frequency component in horizontal and vertical direction.Wherein approximation coefficient cA can carry out again 2 grades of decomposition, as shown in Figure 4 (c), can also proceed 3 grades, 4 grades ... wavelet decomposition.
(8) the level detail factor standard extracting each decomposition level is poor, vertical detail factor standard difference and diagonal detail factor standard poor, by total standard deviation in above three directions, characterize the crease intensity of fabric, wavelet coefficient standard difference is larger, illustrates that fabric pincher degree is more serious.
With the device in the present embodiment and image processing method, to 20 kinds of common fabrics, (raw material comprises cotton, fiber crops, silk, wool, terylene and blending product thereof) carry out the multi-direction wrinkle resistance test of fabric, and with wavelet analysis, 6 is best Decomposition order, the total standard deviation of detail coefficients in fabric three directions of now extracting with the fabric utilizing YG541E type fully-automatic laser fabric crease elasticity test instrument to record from 0 ° (i.e. warp-wise fibre direction) every 10 °, to 170 ° (because 180 ° is 0 ° of direction), the average creasy recovery angle related coefficient of totally 18 angle directions is the highest, reach 0.95.The regression equation of the two is Y=-0.0004X
2-0.0845X+139.12, wherein Y be fabric from 0 ° to 170 °, every 10 ° survey the mean value of creasy recovery angle, X is when being 6 by the method gained fabric wavelet decomposition number of plies in the present invention, the total standard deviation of detail coefficients in wrinkle image three directions.Above regression equation can be used for predicting the multi-direction average creasy recovery angle of fabric, and without the need to carrying out repeatedly duplicate measurements, time saving and energy saving, turn improve work efficiency, provide cost savings.
Be only preferred embodiment of the present invention in sum, be not used for limiting practical range of the present invention.Namely all equivalences done according to the content of the present patent application the scope of the claims change and revision, are technology category of the present invention.
Claims (3)
1. the multi-direction crease recovery system safety testing device of fabric, comprise acquisition and the treating apparatus of the multi-direction wrinkling device of fabric and fabric pincher image, it is characterized in that: the multi-direction wrinkling device material requested of fabric has bead and bungee, bungee is used for tying up the fabric having wrapped up bead, namely jointly played the effect of fabric applying from multiple different directions external force by bead and bungee, make fabric produce divergent shape folding line; The acquisition device of fabric pincher image is digital camera or scanner, and the treating apparatus of fabric pincher image is computing machine.
2. utilize device as claimed in claim 1 to carry out the method for the multi-direction crease recovery test of fabric, it is characterized in that the method is specifically:
(1) by after smooth for fabric to be measured flatiron, given size is cut into; And put on broadwise mark and warp-wise mark;
(2) fabric to be measured after cutting is placed on the upper surface of hollow steel pipe, and bead is put in the center of square ones;
(3) move up the bungee at the outer wall place being enclosed within hollow steel pipe, fabric is made evenly to wrap bead by the movement of bungee, with bungee, the fabric encasing bead is tied up solid again, the number of turns of tying up of every block fabric is unified, namely by bead and bungee, the effect from multiple different directions external force is applied to fabric, make fabric produce the radial folding line dispersed to surrounding by center;
(4) after tying up the set time, with scissors, bungee is cut off, and by light gesture of trying one's best, fabric is spread out;
(5) wrinkle fabric is put into scanner to scan, during scanning, do not have pressure to make fabric pincher produce distortion;
(6) to the wrinkle image input computing machine after scanning, and following pre-service is carried out:
The first step, becomes unified size by the image cropping obtained, and coloured image is converted into gray level image;
Second step, strengthens picture contrast; Adopt the contrast of method to image of grey linear transformation to strengthen dynamically, the tonal range of image can be made dynamically to strengthen, and the contrast of image is effectively expanded, and makes image more clear;
(7) wavelet analysis technology is used pretreated fabric pincher image to be carried out to the decomposition of the different number of plies;
(8) the level detail factor standard extracting each decomposition level is poor, vertical detail factor standard difference and diagonal detail factor standard poor, by total standard deviation in above three directions, characterize the crease intensity of fabric, wavelet coefficient standard difference is larger, illustrates that fabric pincher degree is more serious.
3. want the method for testing described in 2 according to right, it is characterized in that: strengthen picture contrast specifically:
1. draw the histogram of gray level image, observed the intensity profile situation of image by histogram, determine the gray level range needing conversion;
2. utilize the contrast of the method stretching image of linear transformation, namely change the intensity profile scope of image, outstanding interested region, suppresses uninterested region, shows the image after linear transformation;
3. the noise in the method suppression image of Wavelet Denoising Method is selected.
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| CN105353108B (en) * | 2015-10-27 | 2017-02-01 | 浙江理工大学 | Test device and method for simulating bulging property of fabric in actual wearing |
| CN106610360A (en) * | 2015-10-27 | 2017-05-03 | 中国制浆造纸研究院 | Method for evaluating fold-crack resistance of coated paperboard |
| CN105243671B (en) * | 2015-10-27 | 2017-10-24 | 浙江理工大学 | A kind of clothes wear test and the evaluation method of flatness |
| CN105628603B (en) * | 2016-03-10 | 2018-11-27 | 上海工程技术大学 | Fabric pincher analytical equipment |
| CN106198937A (en) * | 2016-07-19 | 2016-12-07 | 江南大学 | A kind of dynamic evaluation method of crease recovery properties of woven fabrics |
| CN108318348A (en) * | 2017-12-31 | 2018-07-24 | 广德大金机械有限公司 | A kind of leather and fur products folding quality Intelligentized test system |
| CN111044517A (en) * | 2019-12-31 | 2020-04-21 | 宁波高新区意融科技有限公司 | Three-dimensional feature-based fabric fold grade evaluation method |
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Effective date of registration: 20191025 Address after: Nong Cun Wang Jia Heshan Town Tongxiang city Jiaxing City, Zhejiang province 314500 Hu Jia Qiao Patentee after: Tongxiang City Jing Feng Textile Co., Ltd. Address before: Hangzhou City, Zhejiang province 310018 Xiasha Higher Education Park No. 2 Street No. 928 Patentee before: Zhejiang University of Technology |
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Address after: No. 118, nanshengbang, dongbangtou village, Heshan Town, Tongxiang City, Jiaxing City, Zhejiang Province, 314512 Patentee after: Zhejiang Jingfeng Textile Technology Co.,Ltd. Address before: 314500 He Shan Zhen Wang Jia Nong Cun Hu Jia Qiao, Tongxiang City, Jiaxing City, Zhejiang Province Patentee before: TONGXIANG JINGFENG TEXTILE CO.,LTD. |
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