CN115367527A

CN115367527A - Cloth detection system and flatness control method for cloth

Info

Publication number: CN115367527A
Application number: CN202110659261.4A
Authority: CN
Inventors: 苏德利; 许文正
Original assignee: Taiwan Textile Research Institute
Current assignee: Taiwan Textile Research Institute
Priority date: 2021-05-18
Filing date: 2021-06-15
Publication date: 2022-11-22
Also published as: TWI797625B; TW202246162A

Abstract

A cloth detection system is used for controlling the evenness of cloth and comprises a detection cavity, a first light source, a camera element, a first roller and a second roller. The detection cavity is provided with a cloth inlet end and a cloth outlet end. The first light source is configured in the detection cavity and is provided with a first light emitting surface, and the first light emitting surface is obliquely opposite to the first surface of the cloth. The image pickup element is arranged in the detection cavity and is provided with an image pickup surface, and the image pickup surface is a first surface which faces the cloth in the forward direction. The first roller is arranged at the cloth inlet end of the detection cavity to control the speed of the cloth entering the detection cavity. The second roller is arranged at the cloth outlet end of the detection cavity so as to control the speed of the cloth output from the detection cavity. The cloth detection system disclosed by the invention can optimize the detection result of the cloth and greatly improve the detection efficiency.

Description

Cloth detection system and flatness control method for cloth

Technical Field

The present disclosure relates to a fabric detecting system and an operating method thereof, and more particularly, to a fabric detecting system for controlling the smoothness of a fabric and a smoothness controlling method thereof.

Background

In the production process of textiles, the quality detection and control of cloth are very important. In the detection process of the cloth, if the smoothness of the cloth is not enough, the situation of detection leakage or false detection is easily caused. In the present stage, the cloth inspecting machine cannot meet the requirement of smoothness of cloth under the requirement of high-speed detection. Therefore, how to satisfy the detection efficiency of the fabric and maintain the smoothness of the fabric at the same time is still a subject of active research by textile manufacturers.

Disclosure of Invention

The disclosure provides a cloth detection system and a flatness control method for cloth, which can ensure the flatness of the cloth, thereby optimizing the detection result of the cloth and greatly improving the detection efficiency.

According to some embodiments of the present disclosure, a cloth inspection system for controlling the smoothness of a cloth includes an inspection chamber, a first light source, a camera, a first roller, and a second roller. The detection cavity is provided with a cloth inlet end and a cloth outlet end. The first light source is configured in the detection cavity and is provided with a first light emitting surface, and the first light emitting surface is obliquely opposite to the first surface of the cloth. The image pickup element is arranged in the detection cavity and is provided with an image pickup surface, and the image pickup surface is a first surface which faces the cloth in the forward direction. The first roller is arranged at the cloth inlet end of the detection cavity to control the speed of the cloth entering the detection cavity. The second roller is arranged at the cloth outlet end of the detection cavity to control the speed of the cloth output from the detection cavity.

In some embodiments of the present disclosure, the cloth inspection system further comprises a second light source disposed in the inspection chamber. The second light source is provided with a second light-emitting surface, the second light-emitting surface is a second surface which faces the cloth in the forward direction, and the second surface is opposite to the first surface.

In some embodiments of the present disclosure, the cloth inspection system further includes a third light source disposed in the inspection chamber. The third light source surrounds the imaging surface of the imaging element.

According to some embodiments of the present disclosure, a method for controlling flatness of a cloth includes the following steps. The cloth detecting system is provided. The cloth is introduced into the detection cavity through the first roller and the second roller. The first surface of the cloth is converted into an image pattern through the first light source and the camera element. Generating characteristic information of the image pattern. And judging whether the moving average value of the characteristic information falls in a standard range or not. And if the moving average value does not fall into the standard range, adjusting the conveying speed of the cloth.

In some embodiments of the present disclosure, the characteristic information of the image pattern includes a total luminance value of the image pattern.

In some embodiments of the present disclosure, when the moving average of the feature information does not fall within the standard range, the rotation speed of the second roller is adjusted.

In some embodiments of the present disclosure, the moving average is established according to 18 to 22 pieces of feature information.

In some embodiments of the present disclosure, the method for controlling flatness of a cloth further includes the following steps. The surface area block of the test cloth is converted into a test image pattern through the first light source and the camera element. The test total luminance value of the test image pattern is calculated. Repeating the steps to obtain the total brightness values of the plurality of tests. And establishing a database by using the total brightness values of the plurality of tests. And establishing a standard range according to the total brightness values of the plurality of tests in the database.

In some embodiments of the present disclosure, establishing the standard range includes the following steps. The maximum value of the total brightness values of the plurality of tests is used to establish the upper limit value of the standard range. And establishing a lower limit value of the standard range by using the minimum value in the total brightness values of the plurality of tests.

In some embodiments of the present disclosure, the base material of the test cloth is the same as the base material of the cloth, and the area and shape of the test image pattern are the same as the area and shape of the image pattern.

According to the above-mentioned embodiments of the present disclosure, the cloth detecting system of the present disclosure includes a first light source, a camera, a first roller and a second roller, so as to generate an image pattern from a cloth to be detected, and further generate characteristic information from the image pattern. The cloth detection system can adjust the conveying speed of the cloth through the characteristic information, so that the smoothness of the cloth is ensured. Therefore, the detection result of the subsequent detection (for example, flaw detection) of the cloth can be optimized, and the conveying speed of the cloth in the cloth detection system can be greatly improved, so that the detection efficiency is improved.

Drawings

The foregoing and other objects, features, advantages and embodiments of the disclosure will be apparent from the following more particular description of the embodiments, as illustrated in the accompanying drawings in which:

FIG. 1 is a schematic diagram of a cloth inspection system according to some embodiments of the present disclosure;

FIG. 2 illustrates a flow chart of a method for controlling planarity of a fabric, according to some embodiments of the present disclosure;

FIG. 3 is a flow chart illustrating a method for establishing a standard range according to some embodiments of the present disclosure; and

fig. 4A to 4C are schematic diagrams illustrating determining whether the moving average of the feature information falls within the standard range according to various embodiments of the disclosure.

[ notation ] to show

50: cloth

51 first surface

53 second surface

100 cloth detection system

110 detection cavity

112 bottom surface

120 first light source

122 first luminous surface

130 image pickup element

132 camera surface

140 first roller

150: second roller

160: third roller

170 second light source

172 second light emitting face

180 third light source

182 third light emitting surface

I, cloth feeding end

O is the cloth outlet end

h1 first height

h2 second height

h is thickness

d1 to d3 distance

Angle between theta 1 and theta 2

S10 to S16, S20 to S24

Detailed Description

In the following description, numerous specific details are set forth in order to provide a thorough understanding of various embodiments of the present disclosure. It should be understood, however, that these implementation details should not be used to limit the disclosure. That is, in some embodiments of the disclosure, such implementation details are not necessary, and thus should not be used to limit the disclosure. In addition, for the sake of simplicity, some conventional structures and elements are shown in the drawings in a simple schematic manner. In addition, the dimensions of the various elements in the drawings are not necessarily to scale, for the convenience of the reader.

It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, and/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" described below could also be termed a second element, component, region, layer or portion without departing from the teachings herein.

The present disclosure provides a fabric inspection system, such as a cloth inspecting machine, that can be configured to control the flatness of a fabric to facilitate inspection (e.g., defect detection) of the fabric. Through the configuration of the first light source, the camera element, the first roller and the second roller in the cloth detection system, the cloth detection system can further adjust the conveying speed of the cloth through characteristic information generated by the cloth so as to ensure the smoothness of the cloth and optimize a detection result. Based on the optimization of the detection result, the conveying speed of the cloth in the cloth detection system can be greatly improved, so that the detection efficiency is improved.

Fig. 1 illustrates a schematic diagram of a cloth inspection system 100 according to some embodiments of the present disclosure. The cloth inspecting system 100 of the present disclosure includes an inspecting chamber 110, a first light source 120, a camera 130, a first roller 140 and a second roller 150. The detection chamber 110 has a cloth entrance end I and a cloth exit end O. In some embodiments, the cloth 50 may enter the detection chamber 110 from the cloth inlet end I, and after performing flatness control and related detection (e.g., defect detection) in the detection chamber 110, the cloth 50 may be output from the cloth outlet end O of the detection chamber 110, wherein the cloth 50 may have a first surface 51 and a second surface 53 opposite to each other. In some embodiments, the fabric 50 may be, for example, a knitted fabric, a woven fabric, a non-woven fabric, or a combination thereof, and the fabric 50 may be a patterned figured cloth. In some embodiments, the detection cavity 110 may be an opaque cavity to prevent external light from affecting the flatness control of the cloth 50, so as to improve the accuracy of the flatness control of the cloth 50.

The first light source 120 is disposed in the detection cavity 110 and has a first light emitting surface 122, and the first light emitting surface 122 faces the first surface 51 of the cloth 50 obliquely. The first light source 120 is disposed to provide light to the first surface 51 of the fabric 50, so that the image pickup device 130 can clearly capture the texture features of the first surface 51 of the fabric 50. In some embodiments, the distance d1 between the first light emitting surface 122 of the first light source 120 and the first surface 51 of the fabric 50 may be between 10 cm and 20 cm, and the angle θ 1 between the normal of the first light emitting surface 122 and the normal of the first surface 51 may be between 30 degrees and 60 degrees (preferably, between 40 degrees and 50 degrees), so that the texture feature of the first surface 51 of the fabric 50 is clearly shown.

The image pickup device 130 is disposed in the detection chamber 110 and has an image pickup surface 132, and the image pickup surface 132 is facing the first surface 51 of the cloth 50, that is, the image pickup surface 132 is parallel to the first surface 51 of the cloth 50. Camera element 130 is configured to convert first surface 51 of fabric 50 into an image pattern to provide control element interpretation, such as a server, to further control the flatness of fabric 50. In other words, the camera device 130 may be coupled to a control device such as a server. In some embodiments, the distance d2 between the image capturing surface 132 of the image capturing device 130 and the first surface 51 of the fabric 50 may be between 15 cm and 45 cm, and the angle θ 2 between the normal of the image capturing surface 132 and the normal of the first light emitting surface 122 of the first light source 120 may be between 30 degrees and 60 degrees (preferably between 40 degrees and 50 degrees), so as to generate a clear image pattern for subsequent interpretation. In some embodiments, the image capture element 130 may be, for example, a charge coupled element.

The first roller 140 and the second roller 150 are respectively disposed at the cloth feeding end I and the cloth discharging end O of the detecting cavity 110 to respectively control the speed of the cloth 50 entering the detecting cavity 110 and the speed of the cloth 50 being discharged from the detecting cavity 110. In detail, the rotation speeds of the first roller 140 and the second roller 150 can control the speed of the cloth 50 entering the detecting chamber 110 and the speed of the cloth 50 output from the detecting chamber 110, respectively. In some embodiments, the first roller 140 and the second roller 150 can be coupled to a control element, such as a server, so that the control element can adjust the rotation speed of each of the first roller 140 and the second roller 150. In some embodiments, the first roller 140 may have a first height h1 relative to the bottom surface 112 of the detection chamber 110, the second roller 150 may have a second height h2 relative to the bottom surface 112 of the detection chamber 110, and the first height h1 may be less than the second height h2. In this way, the smoothness of the cloth 50 during the conveying process can be improved. In some embodiments, the cloth inspection system 100 may further include a plurality of third rollers 160, and the third rollers 160 are disposed outside and/or inside the inspection chamber 110, so as to stably convey the cloth 50. In some embodiments, the third roller 160 is used only to support the cloth 50, and is not used to adjust the rotation speed of the cloth 50. That is, the rotational speed of the third roller 160 varies with the relative rotational speeds of both the first roller 140 and the second roller 150.

In some embodiments, the cloth detecting system 100 may further include a second light source 170 disposed in the detecting cavity 110 and having a second light emitting surface 172, wherein the second light emitting surface 172 is facing the second surface 53 of the cloth 50, that is, the second light emitting surface 172 is parallel to the second surface 53 of the cloth 50. The second light source 170 is configured to provide light to the second surface 53 of the fabric 50 to further penetrate through the inner layer of the fabric 50, so that the image pickup device 130 can clearly photograph the texture features of the inner layer of the fabric 50 close to the first surface 51, thereby improving the accuracy of controlling the flatness of the fabric 50. In some embodiments, the illumination intensity of the second light source 170 may be greater than the illumination intensity of the first light source 120. By the configuration of the second light source 170, the cloth inspection system 100 of the present disclosure can be applied to a cloth 50 having a certain thickness h. For example, the thickness h of the cloth 50 may be between 0.08mm and 0.5 mm. In some embodiments, the distance d3 between the second light emitting surface 172 of the second light source 170 and the second surface 53 of the fabric 50 may be between 10 cm and 20 cm, so that the texture features of the inner layer of the fabric 50 close to the first surface 51 are clearly present.

In some embodiments, the fabric detection system 100 may further include a third light source 180 surrounding the camera surface 132 of the camera device 130, so as to increase the intensity of the light irradiated to the first surface 51 of the fabric 50, so that the texture features of the first surface 51 of the fabric 50 (and the inner layer close to the first surface 51) can be more clearly represented. In some embodiments, the third light source 180 has a third light emitting surface 182 facing the first surface 51 of the cloth 50, that is, the third light emitting surface 182 is parallel to the first surface 51 of the cloth 50. In some embodiments, the third light emitting surface 182 and the image pickup surface 132 of the image pickup element 130 may be substantially coplanar.

It should be understood that the connection and function of the elements described above will not be repeated, and will be described in detail. In the following description, a method of controlling the flatness of a cloth using the cloth inspection system 100, that is, a flatness control method for a cloth will be described.

Fig. 2 is a flow chart illustrating a flatness control method for a cloth according to some embodiments of the present disclosure. Please refer to fig. 1 and fig. 2. The flatness control method for a cloth includes steps S10 to S16. In step S10, a cloth inspection system 100 is provided. In step S11, the cloth 50 is introduced into the detection chamber 110. In step S12, the first surface 51 of the fabric 50 is converted into an image pattern. In step S13, feature information of the image pattern is generated. In step S14, it is determined whether the moving average of the feature information falls within the standard range. If the moving average does not fall within the standard range, the feeding speed of the cloth 50 is adjusted in step S15. If the moving average falls within the standard range, the feed speed of the cloth 50 is maintained in step S16. In the following description, the above steps will be further explained.

First, in step S10, a cloth inspection system 100 as shown in fig. 1 is provided. Next, in step S11, the cloth 50 is introduced into the detection chamber 110 through the first roller 140 and the second roller 150. In some embodiments, the cloth 50 may be further introduced into the detection chamber 110 through a plurality of third rollers 160. In some embodiments, when the cloth 50 is initially introduced into the inspection chamber 110, the first roller 140, the second roller 150, and the plurality of third rollers 160 may have the same rotation speed, thereby well controlling the conveying condition of the cloth 50.

Subsequently, in step S12, at least the light provided by the first light source 120 is transmitted, so that the texture features of the first surface 51 of the fabric 50 and/or the partial area of the inner layer close to the first surface 51 are clearly shown, so that the image pickup device 130 converts the first surface 51 and/or the partial area of the inner layer close to the first surface 51 into an image pattern. In some embodiments, the second light source 170 and/or the third light source 180 may be selectively turned on according to the thickness h of the cloth 50. In more detail, when the cloth 50 has a relatively small thickness h (e.g., a thickness h between 0.08mm and 0.2 mm), the second light source 170 and/or the third light source 180 may be turned off; when the cloth 50 has a relatively large thickness h (e.g., a thickness h between 0.2mm and 0.5 mm), the second light source 170 and the third light source 180 may be turned on. Therefore, the smoothness control method for the cloth can effectively achieve the effects of energy conservation and electricity saving. After this step is completed, the cloth inspection system 100 can convert at least a portion of the area of the first surface 51 of the cloth 50 into an image pattern through at least the first light source 120 and the image sensor 130. In some embodiments, the image pattern may be transmitted to a control element, such as a server, for subsequent use and interpretation.

Next, in step S13, feature information of the image pattern is generated through a control element such as a server. In some embodiments, the characteristic information may include a total luminance value of the image pattern. Specifically, a single image pattern may have a plurality of pixels, wherein each pixel may have a luminance value (e.g., any one of 0 to 255), and the luminance values of each pixel are added to obtain the total luminance value of the image pattern, i.e., the feature information of the image pattern.

Subsequently, in step S14, it is determined whether the moving average of the feature information falls within the standard range through the control element. In some embodiments, the moving average of the feature information may be established based on 18 to 22 pieces of feature information, for example, 20 pieces of feature information. In detail, the moving average of the feature information can be obtained by generating a plurality of continuous feature information (a plurality of total brightness values) through the aforementioned steps S10 to S13, and dividing the plurality of continuous feature information by the number of strokes (for example, by 20 strokes) after adding the plurality of continuous feature information.

In some embodiments, the test cloth may be used to establish a standard range before the cloth 50 is introduced into the detection chamber 110 (e.g., before step S11) as an initial basis for the moving average, so as to increase the detection reliability of the cloth detection system 100. Specifically, the method for establishing the standard range can be seen in fig. 3, which is a flowchart illustrating the method for establishing the standard range according to some embodiments of the present disclosure. In detail, the method for establishing the standard range may include steps S20 to S24. In step S20, the surface area of the test cloth is converted into a test image pattern. In step S21, a test total luminance value of the test image pattern is calculated. In step S22, steps S20 to S21 are repeated to obtain a plurality of test total brightness values. In step S23, a database is built up with a plurality of test total luminance values. In step S24, a standard range is established according to the total brightness values of the plurality of tests in the database.

For the standard range establishing method, firstly, a test cloth and the cloth inspection system 100 shown in fig. 1 are provided, and the cloth 50 is introduced into the inspection chamber 110 through the first roller 140 and the second roller 150. In some embodiments, the test fabric may be, for example, a knitted fabric, a woven fabric, a non-woven fabric, or a combination thereof, and the test fabric may be a standard sample of the fabric 50, so that the established standard range is suitable for the fabric 50. In more detail, as a standard sample, the test cloth may have the same base material and the same image or design as the cloth 50 under the condition that no defect is confirmed. In a preferred embodiment, the test fabric may have the same specifications (e.g., weave density, basis weight, etc.) as the fabric 50 described above, thereby improving the applicability to a standard range.

Next, in step S20, at least the light provided by the first light source 120 is transmitted to clearly present the texture features of the surface area of the test cloth, so as to provide the image pickup device 130 to convert the surface area into the test image pattern. Similar to the step S12, the second light source 170 and/or the third light source 180 can be selectively turned on according to the thickness of the test cloth, so as to effectively achieve the effects of energy saving and power saving. After this step is completed, the fabric inspection system 100 can at least convert the surface area of the test fabric into the test image pattern through at least the first light source 120 and the camera device 130. In some embodiments, the area and shape of the test image pattern generated by the test cloth is the same as the area and shape of the image pattern generated by the cloth 50, thereby improving the accuracy of flatness control of the cloth 50. In some embodiments, the test image pattern may be transmitted to a control element, such as a server, for subsequent use and interpretation.

Subsequently, in step S21, feature information of the test image pattern is generated by the control device. In some embodiments, the feature information may include a test total luminance value of the test image pattern. Specifically, a single test image pattern may have a plurality of pixels, wherein each pixel may have a test luminance value (e.g., any one of 0 to 255), and the test luminance values of each pixel are added to obtain a test total luminance value of the test image pattern, i.e., to obtain the feature information of the test image pattern. In other words, in step S21, the feature information of the test image pattern is generated by calculating the total test brightness value of the test image pattern.

Then, in step S22, the above steps S20 and S21 are repeated to obtain a plurality of test total brightness values. Subsequently, in step S23, a database is built up with the total brightness values of the plurality of tests. In detail, after step S23 is completed, the database may include characteristics (e.g., specifications) of the test cloth and a plurality of total brightness values of the test cloth corresponding to a plurality of surface blocks of the test cloth.

Next, in step S24, a standard range is established according to the total brightness values of the plurality of tests of the test cloth in the database. In some embodiments, the standard range may be established according to 18 to 22 (preferably 20) total brightness values of the test cloth in the database. Specifically, a value obtained by [ (maximum value in the total luminance values of a plurality of tests) × 95%) ] may be used as the upper limit value of the standard range; and using a value obtained by [ (minimum value in the total brightness values of a plurality of tests) × 105% ] as a lower limit value of the standard range. In other words, in step S24, the maximum value and the minimum value of the total brightness values of the plurality of tests can be used to respectively establish the upper limit value and the lower limit value of the standard range, and the standard range can be established by adopting a more strict specification compared with the test result of the test cloth, so as to improve the detection reliability of the cloth detection system 100. As mentioned above, after step S24 is completed, the standard range can be established.

Then, please return to step S14 of fig. 2, and determine whether the moving average of the feature information falls within the standard range through the control element. In detail, please refer to fig. 4A to 4C, which are schematic diagrams illustrating determining whether the moving average of the feature information falls within the standard range according to various embodiments of the present disclosure. In the embodiment of fig. 4A, since the continuous 20 pieces of characteristic information (i.e. the continuous 20 pieces of total brightness values) of the cloth 50 all fall within the standard range, the moving average value of the characteristic information of the cloth 50 also falls within the standard range, which represents that the cloth 50 has good flatness at this time, and therefore, the conveying speed of the cloth 50 does not need to be adjusted. In the embodiment of fig. 4B, although the 20 th piece of characteristic information of the cloth 50 does not fall within the standard range, the moving average of the characteristic information of the cloth 50 still falls within the standard range, so that the feeding speed of the cloth 50 does not need to be adjusted. In the embodiment of fig. 4C, the 20 th characteristic information of the fabric 50 does not fall within the standard range, and the moving average value of the characteristic information of the fabric 50 does not fall within the standard range, at this time, the conveying speed of the fabric 50 needs to be adjusted to ensure that the fabric 50 has good flatness. In some embodiments, when the moving average of the characteristic information of the cloth 50 does not fall within the standard range, the feeding speed of the cloth 50 may be adjusted by adjusting the rotation speed of the second roller 150 or the first roller 140. In more detail, when the moving average of the characteristic information of the cloth 50 is greater than the upper limit value of the standard range, the rotation speed of the second roller 150 may be increased or the rotation speed of the first roller 140 may be decreased; when the moving average of the characteristic information of the cloth 50 is less than the lower limit value of the standard range, the rotation speed of the second roller 150 may be reduced or the rotation speed of the first roller 140 may be increased.

It should be noted that, since the moving average of the feature information of the present disclosure is established according to 18 to 22 consecutive pieces of feature information, the cloth inspection system 100 does not need to adjust the feeding speed of the cloth 50 every time a single piece of feature information is detected to be out of the standard range. Therefore, the cloth detection system 100 can be prevented from adjusting the conveying speed of the cloth 50 too frequently when the smoothness of the cloth 50 is still within the acceptable range, so that the effects of saving energy and electricity and improving the working efficiency are achieved, and the service life of the cloth detection system 100 can be prolonged. In addition, because the flatness of the cloth 50 can be well controlled by the cloth detection system 100, the conveying speed of the cloth 50 in the cloth detection system 100 can be greatly increased, thereby increasing the detection efficiency. Specifically, when the cloth 50 is subjected to flatness control of the cloth 50 by using the cloth inspection system 100 of the present disclosure, the conveying speed of the cloth 50 may be, for example, greater than 40m/min, and preferably may be, for example, between 60m/min and 80 m/min.

According to the above embodiments of the present disclosure, the cloth detecting system of the present disclosure includes a first light source, an image capturing device, a first roller and a second roller, so as to generate an image pattern from a cloth to be detected, and further generate characteristic information from the image pattern. The cloth detection system can adjust the conveying speed of the cloth through the characteristic information, so that the smoothness of the cloth is ensured. Therefore, the detection result of the cloth in subsequent detection (for example, flaw detection) can be optimized, and the conveying speed of the cloth in the cloth detection system can be greatly improved, so that the detection efficiency is improved.

Although the present disclosure has been described with reference to particular embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure, and therefore the scope of the present disclosure should be limited only by the terms of the appended claims.

Claims

1. A cloth detection system for controlling the flatness of a cloth, the cloth detection system comprising:

a detection cavity with a cloth inlet end and a cloth outlet end;

a first light source disposed in the detection cavity, wherein the first light source has a first light-emitting surface, and the first light-emitting surface obliquely faces the first surface of the cloth;

the image pickup element is arranged in the detection cavity, and the image pickup element is provided with an image pickup surface which is the first surface facing the cloth in the forward direction;

the first roller is configured at the cloth feeding end of the detection cavity so as to control the speed of the cloth entering the detection cavity; and

and the second roller is configured at the cloth outlet end of the detection cavity so as to control the speed of the cloth output from the detection cavity.

2. The cloth detection system of claim 1, further comprising:

and the second light source is configured in the detection cavity, wherein the second light source is provided with a second light-emitting surface, the second light-emitting surface is a second surface which faces the cloth in the forward direction, and the second surface is opposite to the first surface.

3. The cloth detection system of claim 1, further comprising:

and the third light source is configured in the detection cavity and surrounds the image pickup surface of the image pickup element.

4. A flatness control method for cloth is characterized by comprising the following steps:

providing a cloth inspection system according to claim 1;

the cloth is introduced into the detection cavity through the first roller and the second roller;

converting the first surface of the cloth into an image pattern through the first light source and the camera element;

generating characteristic information of the image pattern;

judging whether the moving average value of the characteristic information falls into a standard range or not; and

and if the moving average value does not fall into the standard range, adjusting the conveying speed of the cloth.

5. The flatness control method for cloth according to claim 4, wherein the characteristic information of the image pattern includes a total brightness value of the image pattern.

6. The flatness control method for a cloth according to claim 4, wherein when the moving average of the characteristic information does not fall within the standard range, the rotation speed of the second roller is adjusted.

7. A flatness control method for a cloth according to claim 4, wherein said moving average is established based on 18 to 22 strokes of said characteristic information.

8. The flatness control method for a cloth according to claim 4, further comprising:

converting the surface block of the test cloth into a test image pattern through the first light source and the camera element;

calculating a test total brightness value of the test image pattern;

repeating the steps to obtain a plurality of test total brightness values;

establishing a database by using a plurality of test total brightness values; and

and establishing the standard range according to the plurality of test total brightness values in the database.

9. The flatness control method for a cloth according to claim 8, wherein establishing the standard range includes:

establishing an upper limit value of the standard range by using a maximum value in a plurality of test total brightness values; and

and establishing a lower limit value of the standard range by using the minimum value of the plurality of test total brightness values.

10. The flatness control method for a cloth according to claim 8, wherein a base material of the test cloth is the same as a base material of the cloth, and an area and a shape of the test image pattern are the same as an area and a shape of the image pattern.