CN113820323A

CN113820323A - Fabric detection system and fabric detection method

Info

Publication number: CN113820323A
Application number: CN202010707250.4A
Authority: CN
Inventors: 苏德利; 许文正; 黄庆堂; 廖伟傑; 叶静
Original assignee: Taiwan Textile Research Institute
Current assignee: Taiwan Textile Research Institute
Priority date: 2020-06-19
Filing date: 2020-07-21
Publication date: 2021-12-21
Also published as: TW202200987A; TWI764179B

Abstract

A fabric detection system comprises a guide roller, a camera element, a first light source, a second light source and a side light element. The image pickup element faces the image pickup area between the guide rollers. The first light source is configured beside the camera element and provides first light. The second light source provides second light parallel to the first light, and the guide roller is disposed between the first light source and the second light source. The side light element is disposed between the image pickup element and the guide roller. The side light element provides third light and fourth light. A first included angle is formed between the third light and the first light, and a second included angle is formed between the fourth light and the first light. The image capturing area is located between the first light source and the second light source, and also located between the third light source and the fourth light source. The fabric detection system and method of the invention can provide automatic fabric detection function.

Description

Fabric detection system and fabric detection method

Technical Field

The present invention relates to a detecting system and a detecting method, and more particularly, to a fabric detecting system and a fabric detecting method.

Background

The fabric needs to go through a manual cloth inspecting process before being shipped, so that the fabric is free of defects. However, the manual detection is slow, which consumes much labor and time. The manual detection also requires a person to visually observe whether the fabric has flaws, which easily causes fatigue. Meanwhile, the flaws easily generated by different fabrics are different, and the efficiency and accuracy of the whole manual cloth inspection are difficult to improve due to the reason that personnel are easy to fatigue.

Disclosure of Invention

The fabric detection system and the fabric detection method provided by the embodiment of the invention can improve the detection efficiency of fabric flaws.

The fabric detection system comprises a plurality of guide rollers, an image pickup element, a first light source, a second light source and a side light element. The image pickup element faces the image pickup area between the guide rollers. The first light source is configured beside the camera element and provides first light. The second light source provides second light, and the guide roller is configured between the first light source and the second light source. The side light element is disposed between the image pickup element and the guide roller. The side-light element includes a third light source providing third light and a fourth light source providing fourth light. The first light and the second light are parallel, a first included angle is formed between the third light and the first light, and a second included angle is formed between the fourth light and the first light. The image capturing area is located between the first light source and the second light source in the first direction. The image capturing area is located between the third light source and the fourth light source in the second direction. The first direction is perpendicular to the second direction.

In an embodiment of the invention, the first included angle is in a range of 45 degrees to 60 degrees. The second included angle falls within a range of-60 degrees to-45 degrees. The absolute value of the first angle is the same as the absolute value of the second angle.

In an embodiment of the present invention, the guide roller extends in the third direction. The third direction is perpendicular to the first direction and the second direction. The side light element comprises a first lamp pole and a second lamp pole. The third light source is configured on the first lamp pole, the fourth light source is configured on the second lamp pole, and the first lamp pole and the second lamp pole extend along a third direction.

In an embodiment of the present invention, the fabric detection system further includes a housing. The housing has a first opening and a second opening, wherein in the second direction, the guide roller is located between the first opening and the second opening.

The fabric detection method of the embodiment of the invention comprises the following steps. A web detection system as described above is provided. A first fabric is disposed on the guide roll. The first fabric is illuminated with the first light, the second light, the third light, and the fourth light. The first fabric in the image acquisition area is shot by the camera element and characteristic information is obtained. And judging the quality of the second fabric by using the characteristic information.

In an embodiment of the present invention, the obtaining of the feature information includes the following steps. The first web is illuminated under illumination conditions. The fabric image is captured by the camera element. Gray-level co-occurrence matrix (GLCM) is obtained from the fabric image at 0 degree, 45 degree, 90 degree and 135 degree. Calculating the square sum of a plurality of elements of each gray level co-occurrence matrix, and calculating the standard deviation of the plurality of square sums as characteristic information.

In an embodiment of the present invention, in the above-mentioned illumination condition, the intensities of the first light, the third light and the fourth light are the same. The intensity of the second light is 2.6 times to 17 times the intensity of the first light.

In an embodiment of the invention, in the above lighting condition, the intensities of the first light, the third light and the fourth light are the same, and the intensity of the second light is 0.8 times to 2 times of the intensity of the first light.

In an embodiment of the present invention, in the above-mentioned lighting condition, the intensities of the first light, the third light and the fourth light are the same, and the intensity of the second light is 0.05 times to 0.64 times the intensity of the first light.

As can be seen from the above, the fabric detection system of the embodiment of the invention can irradiate the fabric to be detected through the first light source, the second light source and the side light element, and capture an image of the fabric to be detected by the camera element to automatically detect the defect of the fabric to be detected. The fabric detection method provided by the embodiment of the invention can automatically acquire the characteristic information of the first fabric through the first light, the second light, the third light and the fourth light, judge the quality of the second fabric according to the characteristic information and further automatically detect the second fabric.

Drawings

FIG. 1 is a front view of a web detection system in an embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along section line 2 of FIG. 1;

FIG. 3 is a top view of a fabric detection system in an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a web detection system in another embodiment of the present invention; FIG. 5 is a flow chart of a method of fabric inspection in an embodiment of the present invention; and FIG. 6 is another flow chart of a method of fabric inspection in an embodiment of the present invention.

[ notation ] to show

a1 first included angle

a2 second angle

d1 first direction

d2 second direction

d3 third Direction

h1 height

h2 height

h3 height

h4 height

h5 height

L1 first light

L2 second light

L3 third light

L4 fourth light

S1 rotating shaft

w1 width

w2 width

100 fabric detection system

110 guide roll

111 guide roller

120 image pickup device

121 image capture area

122 sliding rail

130 first light source

140 second light source

150 side light element

151 third light source

152 fourth light source

153 first lamp pole

154 second lamp pole

155 side support

156 side support

157 roller

158 roller

159 sliding rail

160 casing

161 accommodating space

162 cover body

163 first side wall

163B lower edge

164 second side wall

164B lower edge

165: substrate

165S bearing surface

166 Fabric entrance

167 fabric exit

168 stage

169 third side wall

170 control element

171 processing element

172 control element

180, driving roller

181 first guide roller

182 the second guide roller

183 luminous table

184 transparent layer

185 light-emitting element

186 light emitting surface

200 first fabric

201 surface of

Detailed Description

The fabric detection system and the fabric detection method of the embodiment of the invention can be applied to a fabric manufacturing system and can also be applied to a cloth inspecting system, and the invention is not limited to the system.

It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a "first element," "component," "region," "layer" or "portion" discussed below could also be termed a second element, component, region, layer or portion without departing from the teachings herein.

Fig. 1 is a front view of a fabric inspecting system according to an embodiment of the present invention, and fig. 2 is a sectional view taken along a cut line 2 of fig. 1. Referring to fig. 1 and 2, in the present embodiment, the fabric detecting system 100 includes a guide roller 110, a guide roller 111, an image capturing device 120, a first light source 130, a second light source 140, and a side light device 150.

The image capturing device 120 faces the guide roller 110 and the image capturing area 121 between the guide rollers 111. The first light source 130 is disposed beside the image sensor 120. The

guide rollers

110 and 111 are disposed between the first light source 130 and the second light source 140. The side light element 150 is provided between the image pickup element 120 and these

guide rollers

110 and 111.

Referring to fig. 2, in the present embodiment, the side light element 150 includes a third light source 151 and a fourth light source 152. The first light source 130 provides first light L1, the second light source 140 provides second light L2, the third light source 151 of the side-light element 150 provides third light L3, and the fourth light source 152 of the side-light element 150 provides fourth light L4.

The first light L1 and the second light L2 are parallel, the third light L3 and the first light L1 form a first included angle a1, and the fourth light L4 and the first light L1 form a second included angle a 2. In the first direction d1, the image capture area 121 is located between the first light source 130 and the second light source 140. In the second direction d2, the image capture area 121 is located between the third light source 151 and the fourth light source 152. The first direction d1 is perpendicular to the second direction d 2.

Since the guide rolls 110 and 111 of the present embodiment can carry the first web 200, the first web 200 can be evenly distributed in the image acquisition region 121 between the guide rolls 110 and 111. Meanwhile, the first light source 130, the second light source 140, and the third light source 151 and the fourth light source 152 on the side light element 150 can illuminate the first fabric 200 in the image capturing area 121 in different directions. Therefore, when the first fabric 200 has a defect, the first light L1 provided by the first light source 130, the second light L2 provided by the second light source 140, the third light L3 provided by the third light source 151, or the fourth light L4 provided by the fourth light source 152 can form an image corresponding to the defect in the image capturing region 121, so that the image capturing device 120 can capture the image. For example, the flaws on the first fabric 200 may form shadows, dark stripes or bright stripes after being irradiated by the first light L1, the second light L2, the third light L3 or the fourth light L4, which is not limited in the present invention.

Based on the image captured by the image capturing device 120 from the image capturing area 121, the fabric inspecting system 100 of the present embodiment can obtain and store the characteristic information from the image, and further determine whether the second fabric (not shown in fig. 2) has similar defects according to the characteristic information.

Further, the fabric detecting system 100 of the present embodiment further includes a housing 160 having an accommodating space 161. The guide roller 110, the guide roller 111, the image pickup element 120, the first light source 130, the second light source 140, and the side light element 150 are disposed in the accommodating space 161.

The housing 160 has a cover 162, a first sidewall 163, a second sidewall 164, and a base 165, wherein the first sidewall 163 and the second sidewall 164 are opposite, and the base 165 and the cover 162 are substantially opposite. The cover 162 is pivotally connected to the second sidewall 164, and a rotation axis S1 connecting the cover 162 and the second sidewall 164 is parallel to the third direction d 3. The third direction d3 is perpendicular to the first direction d1 and the second direction d 2. Fig. 1 shows a state where the cover 162 is opened.

The first sidewall 163 and the base 165 of this embodiment have a fabric inlet 166 therebetween. Specifically, fabric inlet 166 is rectangular in shape, and the long side of fabric inlet 166 extends along third direction d 3. The width w1 of the fabric inlet 166 in the third direction d3 is the same as the width w2 of the first sidewall 163 in the third direction d3, and the width w1 may fall in the range of 90 cm to 220 cm, so that the fabric inlet 166 may admit fabrics of various widths.

Referring to fig. 2, the second sidewall 164 and the substrate 165 of the present embodiment have a web outlet 167 therebetween, and the guide roll 110, the image capture area 121 and the guide roll 111 are located between the web inlet 166 and the web outlet 167 in the second direction d 2. Accordingly, the first web 200 can enter the housing 160 through the web inlet 166, sequentially pass through the guide roll 110, the image acquisition area 121, and the guide roll 111, and then exit the housing 160 through the web outlet 167. When the first fabric 200 is located in the image capturing area 121, the image capturing device 120 can capture an image of the first fabric 200.

The base 165 of the housing 160 is adapted to carry the second light source 140, and a main optical axis of the second light L2 emitted by the second light source 140 is substantially parallel to a normal of the base 165 connected to the carrying surface 165S of the second light source 140. Thus, when the guide roll 110 and the guide roll 111 carry the first fabric 200, the second light L2 may also illuminate the first fabric 200 in a direction perpendicular to the surface 201 of the first fabric 200.

Fig. 3 is a top view of the fabric detecting system 100 according to the embodiment of the invention, and fig. 3 omits to show the cover 162 of the housing 160 and the first fabric 200. Referring to fig. 3, in the present embodiment, the guide roller 110 and the guide roller 111 are parallel to each other, and both the guide roller 110 and the guide roller 111 extend along the third direction d 3. Referring to fig. 2, the height of the guide roller 110 and the height of the guide roller 111 in the first direction d1 are the same. Specifically, the height h1 in the first direction d1 between the guide roller 110 and the guide roller 111 and the carrying surface 165S of the substrate 165 falls within a range of 4 cm to 10 cm. A height h2 between the lower edge 163B of the first side wall 163 and the bearing surface 165S in the first direction d1 falls within a range of 6 cm to 15 cm. Accordingly, the web inspection system 100 is adapted to receive webs of various thicknesses from the web inlet 166 for inspection of the web.

The height h3 between the lower edge 164B of the second sidewall 164 and the bearing surface 165S in the first direction d1 falls within a range of 6 to 15 centimeters. Accordingly, the web inspection system 100 is adapted to feed webs of various thicknesses from the web outlet 167 and further pass the webs to other inspection devices or cloth winding devices.

Referring to fig. 2, in the present embodiment, a height h4 between the first light source 130 and the

guide rollers

110 and 111 in the first direction d1 is in a range of 40 cm to 50 cm, and a height h5 between the second light source 140 and the

guide rollers

110 and 111 in the first direction d1 is in a range of 3 cm to 7 cm. The first light source 130, the third light source 151 and the fourth light source 152 are located on one side of the

guide rollers

110 and 111 adjacent to the image pickup element 120, a first included angle a1 is formed between the third light L3 emitted by the third light source 151 and the first light L1 emitted by the first light source 130, the first included angle a1 is in a range of 45 degrees to 60 degrees, a second included angle a2 is formed between the fourth light L4 and the first light L1, and the second included angle a2 is in a range of-45 degrees to-60 degrees. Here, the angle indicates that the positions of the third light source 151 and the fourth light source 152 are respectively shifted in opposite directions by negative values. The absolute value of the first angle a1 is the same as the absolute value of the second angle a 2. Therefore, the first light L1, the second light L2, the third light L3 and the fourth light L4 provided by the first light source 130, the second light source 140, the third light source 151 and the fourth light source 152, respectively, can sufficiently irradiate the first fabric 200 on the

guide rollers

110 and 111.

Referring to fig. 2 and 3, in the present embodiment, the guide roller 110 and the guide roller 111 extend along the third direction d 3. The side light element 150 comprises a first pole 153 and a second pole 154. The third light source 151 is disposed on the first pole 153, the fourth light source 152 is disposed on the second pole 154, and the first pole 153 and the second pole 154 extend along the third direction d 3. Specifically, in the present embodiment, the first lamp rod 153 and the second lamp rod 154 may be respectively configured with a plurality of third light sources 151 and a plurality of fourth light sources 152, but the present invention is not limited thereto. In other embodiments, the third light source 151 and the fourth light source 152 may also be bar-shaped light sources extending along the third direction d 3.

In this embodiment, the side light elements 150 may further include

side brackets

155 and 156. Side bracket 155 and side bracket 156 extend along second direction d2 and connect first pole 153 and second pole 154. Specifically, the first pole 153 and the second pole 154 are disposed inside the side frames 155 and 156, the side light element 150 further includes a roller 157 and a roller 158, and the roller 157 and the roller 158 are disposed outside the side frames 155 and 156, respectively. The

rollers

157 and 158 are adapted to roll against the fabric to avoid the fabric from becoming caught on the side light elements 150.

Referring to fig. 2, in detail, the fabric detecting system 100 of the present embodiment may further include a control element 170 disposed outside the second sidewall 164, and the control element 170 is electrically connected to the camera 120, the first light source 130, the third light source 151, and the fourth light source 152. The control element 170 is adapted to control power signals provided to the image pickup element 120, the first light source 130, the third light source 151, and the fourth light source 152, and receive an image signal from the image pickup element 120. Referring to fig. 1, the fabric detecting system 100 may further include a processing element 171, the housing 160 includes a stage 168, the processing element 171 is disposed on the stage 168, and the processing element 171 may be electrically connected to the control element 170, and further receive the image signal or control the power of the image capturing element 120, the first light source 130, the third light source 151, and the fourth light source 152. Specifically, the housing 160 may include a third sidewall 169 connected to the first sidewall 163 and the second sidewall 164. The stage 168 is connected to the third sidewall 169.

On the other hand, in the present embodiment, the second light source 140 is disposed on the other control element 172, and the control element 172 and the second light source 140 are disposed on the carrying surface 165S of the substrate 165 together. The control device 172 is used for providing power to the second light source 140, and the control device 172 may be further electrically connected to the processing device 171, so that a user can control the second light source 140 from the processing device 171.

In other embodiments of the present invention, the image capturing element 120 may also be directly electrically connected to the processing element 171, but the present invention is not limited thereto. The processing device 171 in the above embodiments is, for example, a notebook computer or a desktop computer, but the invention is not limited thereto.

On the other hand, referring to fig. 1, in the present embodiment, the fabric detecting system 100 further includes a slide rail 122. The image sensor 120 is connected to the second sidewall 164 through a slide rail 122. The slide rail 122 is used for allowing the camera device 120 to move along the third direction d3, thereby adjusting the position of the image capturing area 121 (see fig. 2).

Referring to fig. 3, the fabric detection system 100 also includes a slide rail 159. In the present embodiment, the side light element 150 is connected to the second sidewall 164 via a slide rail 159. The slide rail 159 allows the side light element 150 to move along the third direction d3, so that the side light element 150 can be adjusted in position corresponding to the image capturing area 121 (see fig. 2).

Fig. 4 is a cross-sectional view of a web detection system in another embodiment of the present invention. Referring to fig. 4, in another embodiment of the present invention, the fabric detection system 100A is similar to the fabric detection system 100 described above, and like elements are identified by like reference numerals, and detailed description thereof is omitted here. Unlike the fabric sensing system 100, the fabric sensing system 100A may further include a driving roller 180 for driving and winding the first fabric 200. The driving roller 180 is disposed adjacent to a side of the fabric outlet 167 of the housing 160.

The web testing system 100A can further include a first guide roller 181, a second guide roller 182, a plurality of light emitting elements 185, and a light emitting station 183. The second guide roller 182 is disposed above the light emitting stage 183, and the light emitting elements 185 are disposed in the light emitting stage 183. The light-emitting stage 183 has a light-transmitting layer 184, and the light-emitting elements 185 are disposed adjacent to the light-transmitting layer 184.

The light-transmitting layer 184 is positioned between the first guide roller 181 and the second guide roller 182 in the first direction d1, so that the first guide roller 181 and the second guide roller 182 can drive the first fabric 200 to pass through the light-emitting surface 186 of the light-transmitting layer 184. The driving roller 180 and the first guide roller 181 are disposed at opposite sides of the light-emitting station 183, so that the driving roller 180 can drive the first fabric 200 to sequentially pass through the guide roller 110, the image capturing area 121, the guide roller 111, the first guide roller 181, and the second guide roller 182. The fabric detection system 100A can detect the first fabric 200 through the camera device 120, and at the same time, can allow a person to observe the first fabric 200 on the transparent layer 184, thereby further providing a complete detection function.

FIG. 5 is a flow chart of a method of fabric inspection in accordance with an embodiment of the present invention. The following description will use the reference numerals of the web inspection system 100 of the above embodiment together for the convenience of description. Referring to fig. 5, in the present embodiment, the fabric detection method includes: providing the web detection system 100 described above (step S11); disposing the first web 200 on the guide roll 110 and the guide roll 111 (step S12); irradiating the first fabric 200 with the first light L1, the second light L2, the third light L3, and the fourth light L4 (step S13); taking a picture of the first fabric 200 in the image capturing area 121 by the camera 120 and obtaining characteristic information (step S14); and judging the quality of the second fabric according to the characteristic information (step S15).

For example, the first fabric 200 is a woven fabric with hole defects. The first fabric 200 is irradiated by the first light L1, the second light L2, the third light L3 and the fourth light L4 (step S13), and the image pickup device 120 can capture an image corresponding to the hole defect and acquire characteristic information from the image.

Next, the fabric inspection system 100 determines the quality of the second fabric according to the characteristic information (step S15), so as to confirm whether the second fabric has the hole defect. Since the image capturing device 120 can automatically capture the image of the second fabric from the image capturing area 121, the fabric inspecting system 100 can further determine the quality of the second fabric according to the characteristic information. Therefore, the fabric inspecting method of the present embodiment can automatically determine whether the second fabric has defects similar to the first fabric 200, thereby providing an automatic quality management function.

Further, in the fabric detection method of the present embodiment, after the characteristic information is obtained in step S14, the detection model may be trained by machine learning, and the detection model may be trained by Fast-based connected network (RCNN) with the characteristic information as input and the defect type as output. After the training is completed, the quality of the second fabric is judged by the detection model (step S15).

Specifically, the first light L1 and the second light L2 of the embodiment are parallel, the first included angle a1 is sandwiched between the third light L3 and the first light L1, the second included angle a2 is sandwiched between the fourth light L4 and the first light L1, the first included angle a1 falls within a range from 45 degrees to 60 degrees, the second included angle a2 falls within a range from-60 degrees to-45 degrees, and an absolute value of the first included angle a1 is the same as an absolute value of the second included angle a 2. Therefore, when the first fabric 200 is irradiated by the first light L1, the second light L2, the third light L3 and the fourth light L4 (step S13), the fabric inspection method of the embodiment can more efficiently obtain the image corresponding to the defect when the image capturing device 120 captures the first fabric 200 in the image capturing area 121 (step S14).

FIG. 6 is another flow chart of a method of fabric inspection in accordance with an embodiment of the present invention. Referring to fig. 5 and 6, in the present embodiment, the step of obtaining the feature information includes: illuminating the first web 200 with illumination conditions (step S21); capturing the fabric image with the camera device 120 (step S22); obtaining gray level co-occurrence matrices from the fabric image at 0 degree, 45 degrees, 90 degrees and 135 degrees (step S23); and calculating the sum of squares of a plurality of elements of each gray-scale co-occurrence matrix and calculating the standard deviation of the sum of squares as the characteristic information (step S24).

In detail, the fabric image captured by the camera device 120 of the embodiment has a plurality of pixels, and the fabric detection method of the embodiment utilizes the gray-scale co-occurrence matrix to describe the texture characteristics of the pixels in a specific direction, wherein the 0 degree direction is horizontal, the 45 degree direction is right diagonal, the 90 degree direction is vertical, and the 135 degree direction is left diagonal. Therefore, the web inspection method of the present embodiment can obtain a plurality of gray level co-occurrence matrices through step S23 to determine the defect patterns extending along various directions on the first web 200 or the second web.

Through step S24, the fabric detection method of this embodiment can prevent the characteristic information from being affected by the patterns, lines, or designs and colors of the fabric itself, and further accurately determine whether the second fabric has defects.

Further, in step S21, the method for detecting a web of material of the present embodiment can irradiate the first web 200 under 17 illumination conditions, and respectively obtain image data of the first web 200 under the 17 illumination conditions. In detail, in a specific illumination condition, the first light L1, the second light L2, the third light L3 and the fourth light L4 have specific intensities, and the wavelengths thereof fall within the spectrum range of white light or infrared light, for example, wherein infrared light is preferred.

In these light irradiation conditions, the intensities of the first light L1, the third light L3, and the fourth light L4 in the partial light irradiation condition are the same, and the intensity of the second light L2 is 2.6 times to 17 times the intensity of the first light L1. This portion of the illumination conditions can therefore obtain characteristic information for the hole defects of the first fabric 200.

In these light irradiation conditions, the intensities of the first light L1, the third light L3, and the fourth light L4 in the other part of the light irradiation conditions are the same, and the intensity of the second light L2 is 0.8 times to 2 times the intensity of the first light L1. This portion of the illumination condition can thus obtain characteristic information for a crease defect or a stain defect of the first web 200.

In these light irradiation conditions, the intensities of the first light L1, the third light L3, and the fourth light L4 in the other light irradiation conditions are the same, and the intensity of the second light L2 is 0.05 times to 0.64 times the intensity of the first light L1. This part of the illumination condition can thus obtain characteristic information for the horizontal or vertical flaws of the first fabric 200.

However, the present invention is not limited thereto, and in other embodiments of the present invention, the fabric inspection method may add more other illumination conditions according to the requirement, and acquire more image data of the first fabric and obtain the characteristic information thereof, and then determine whether the second fabric has the same defect as the first fabric according to the more illumination conditions. In other embodiments of the present invention, the fabric inspection method can also illuminate with single or partial illumination conditions for specific types of defects and sequentially capture images of the first fabric and the second fabric to increase the inspection speed.

In summary, the fabric inspection system according to the embodiment of the invention can illuminate the fabric through the first light source, the second light source and the side light element, so that the image capturing device can effectively obtain the image corresponding to the defect of the fabric from the image capturing area. The fabric detection method of the embodiment of the invention can obtain the characteristic information from the first fabric through the fabric detection system, and then judge whether the second fabric has the defects similar to the first fabric or not according to the characteristic information, thereby automatically detecting the quality of the second fabric.

Claims

1. A fabric detection system, comprising:

a plurality of guide rollers;

the image pickup element faces to the image capturing area among the guide rollers;

a first light source disposed near the image pickup element and providing a first light;

a second light source for providing a second light, wherein the guide roller is arranged between the first light source and the second light source; and

a side light element disposed between the image pickup element and the guide roller and including a third light source and a fourth light source to provide third light and fourth light,

the first light and the second light are parallel, a first included angle is formed between the third light and the first light, a second included angle is formed between the fourth light and the first light, the image capturing area is located between the first light source and the second light source in the first direction, the image capturing area is located between the third light source and the fourth light source in the second direction, and the first direction is perpendicular to the second direction.

2. The fabric detection system of claim 1, wherein the first included angle falls within a range of 45 degrees to 60 degrees, the second included angle falls within a range of-60 degrees to-45 degrees, and an absolute value of the first included angle and an absolute value of the second included angle are the same.

3. The fabric test system of claim 1, wherein the guide rollers extend along a third direction that is perpendicular to the first direction and the second direction, and the sidelight components include a first pole and a second pole, the third light source being disposed on the first pole, the fourth light source being disposed on the second pole, the first pole and the second pole extending along the third direction.

4. The fabric detection system of claim 1, further comprising a housing having a first opening and a second opening, wherein in the second direction, the guide roller is positioned between the first opening and the second opening.

5. A method of fabric testing, comprising:

providing a web inspection system as described in claim 1;

disposing a first fabric on the guide roll;

illuminating the first fabric with the first light, the second light, the third light, and the fourth light;

shooting the first fabric in the image acquisition area by the camera element and obtaining characteristic information; and

and judging the quality of the second fabric according to the characteristic information.

6. The method of claim 5, wherein the first included angle falls within a range of 45 degrees to 60 degrees, the second included angle falls within a range of-60 degrees to-45 degrees, and an absolute value of the first included angle and an absolute value of the second included angle are the same.

7. The method of claim 5, wherein obtaining the characterization information comprises:

illuminating said first web with illumination conditions;

capturing fabric images by the camera element;

obtaining a plurality of gray scale co-occurrence matrices from the fabric image at 0 degrees, 45 degrees, 90 degrees and 135 degrees; and

and calculating the square sum of a plurality of elements of each gray-scale co-occurrence matrix, and calculating the standard deviation of the square sums to be the characteristic information.

8. The method of claim 7, wherein in the illuminated condition, the intensities of the first light, the third light, and the fourth light are the same, and the intensity of the second light is 2.6 times to 17 times the intensity of the first light.

9. The method of claim 7, wherein in the illuminated condition, the intensities of the first light, the third light, and the fourth light are the same, and the intensity of the second light is 0.8 times to 2 times the intensity of the first light.

10. The method of claim 7, wherein in the illuminated condition, the intensities of the first light, the third light, and the fourth light are the same, and the intensity of the second light is 0.05 times to 0.64 times the intensity of the first light.