CN115367527A - Cloth detection system and flatness control method for cloth - Google Patents

Abstract

A cloth detection system and a method for controlling the smoothness of the cloth. The cloth detection system is used to control the smoothness of the cloth, and includes a detection chamber, a first light source, an imaging element, a first roller and a second roller. The detection chamber has a cloth inlet end and a cloth outlet end. The first light source is arranged in the detection chamber and has a first light-emitting surface, and the first light-emitting surface is obliquely facing the first surface of the cloth. The imaging element is arranged in the detection cavity, and has an imaging surface, and the imaging surface is facing the first surface of the cloth. The first roller is arranged at the cloth-entry end of the detection chamber to control the speed at which the cloth enters the detection chamber. The second roller is arranged at the cloth output end of the detection chamber to control the speed of the cloth output from the detection chamber. The fabric detection system disclosed in this disclosure can optimize the detection result of the fabric and greatly improve the detection efficiency.

Description

Cloth detection system and method for controlling flatness of cloth

technical field

The present disclosure relates to a cloth detection system and its operating method, and in particular to a cloth detection system for controlling the flatness of the cloth and a method for controlling the flatness of the cloth.

Background technique

In the production process of textiles, the quality inspection and control of fabrics is very important. During the cloth inspection process, if the flatness of the cloth is insufficient, it is easy to cause missed detection or false detection. At this stage, the cloth inspection machine cannot meet the requirements of the flatness of the cloth under the high-speed inspection requirements. Therefore, how to satisfy the detection efficiency of the fabric and maintain the flatness of the fabric at the same time is still an active research topic for the textile industry.

Contents of the invention

The present disclosure provides a cloth detection system and a method for controlling the flatness of the 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, the cloth detection system for controlling the flatness of the cloth includes a detection chamber, a first light source, an imaging element, a first roller and a second roller. The detection chamber has a cloth inlet end and a cloth outlet end. The first light source is arranged in the detection chamber and has a first light-emitting surface, and the first light-emitting surface is obliquely facing the first surface of the cloth. The imaging element is arranged in the detection cavity, and has an imaging surface, and the imaging surface faces the first surface of the cloth. The first roller is arranged at the cloth inlet end of the detection chamber to control the speed of the cloth entering the detection chamber. The second roller is arranged at the cloth output end of the detection chamber to control the speed of the cloth output from the detection chamber.

In some embodiments of the present disclosure, the cloth detection system further includes a second light source disposed in the detection cavity. The second light source has a second light emitting surface, the second light emitting surface is the second surface facing the cloth, and the second surface is opposite to the first surface.

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

According to some embodiments of the present disclosure, the method for controlling flatness of cloth includes the following steps. The aforementioned cloth detection 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 imaging element. Generate feature information of the image pattern. It is judged whether the moving average of the feature information falls within the standard range. If the moving average does not fall within the standard range, adjust the feed speed of the fabric.

In some embodiments of the present disclosure, the feature information of the image pattern includes the total brightness value of the image pattern.

In some implementations 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 based on the characteristic information of 18 to 22 items.

In some embodiments of the present disclosure, the method for controlling the flatness of cloth further includes the following steps. The surface area of the test fabric is converted into a test image pattern through the first light source and the camera element. Calculate the test total luminance value of the test image pattern. Repeat the above steps to obtain the total brightness value of multiple tests. The database is established with the total brightness value of multiple tests. A standard range is established based on the total brightness values of multiple tests in the database.

In some embodiments of the present disclosure, establishing a standard range includes the following steps. The upper limit of the standard range is established using the maximum value of the total luminance value of the multi-stroke test. The lower limit of the standard range is established using the minimum of the total luminance values of the multiple tests.

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

According to the above-mentioned embodiments of the present disclosure, the cloth inspection system of the present disclosure includes a first light source, an imaging element, a first roller and a second roller, so as to generate an image pattern from the cloth to be inspected, and further generate features from the image pattern information. The fabric detection system can adjust the conveying speed of the fabric through characteristic information to ensure the smoothness of the fabric. In this way, the detection results of the subsequent inspection of the cloth (for example, defect detection) can be optimized, and the conveying speed of the cloth in the cloth inspection system can be greatly increased, thereby improving the detection efficiency.

Description of drawings

In order to make the above and other objects, features, advantages and embodiments of the present disclosure more comprehensible, the accompanying drawings are described as follows:

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

FIG. 2 shows a flowchart of a method for controlling flatness of cloth according to some embodiments of the present disclosure;

FIG. 3 shows a flowchart of a method for establishing a standard range according to some embodiments of the present disclosure; and

4A to 4C are schematic diagrams of determining whether the moving average of feature information falls within a standard range according to different embodiments of the present disclosure.

【Symbol Description】

50: cloth

51: First Surface

53:Second surface

100: Fabric detection system

110: detection cavity

112: bottom surface

120: The first light source

122: the first light-emitting surface

130: camera element

132: camera surface

140: The first roller

150: Second roller

160: The third roller

170: Second light source

172: Second light-emitting surface

180: The third light source

182: The third luminous surface

I: Into the cloth end

O: Cloth outlet

h1: first height

h2: second height

h: thickness

d1～d3: distance

θ1～θ2: included angle

S10～S16, S20～S24: steps

Detailed ways

A number of implementations of the present disclosure will be disclosed below with the accompanying drawings. For the sake of clarity, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present disclosure. That is to say, in some embodiments of the present disclosure, these practical details are unnecessary, and thus should not be used to limit the present disclosure. In addition, for the sake of simplifying the drawings, some known and conventional structures and elements will be shown in a simple and schematic manner in the drawings. In addition, for the convenience of readers, the sizes of the elements in the drawings are not shown in actual scale.

It should be understood that although the terms "first", "second" and "third" etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, and and/or parts 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 from each other. Thus, a "first element," "component," "region," "layer" or "section" hereinafter could be termed a second element, component, region, layer or section without departing from the teachings herein. .

The present disclosure provides a cloth inspection system, which can be, for example, a cloth inspection machine, and can be configured to control the flatness of the cloth, so as to facilitate inspection of the cloth (eg, flaw detection). Through the configuration of the first light source, camera element, first roller and second roller in the fabric detection system, the fabric detection system can further adjust the conveying speed of the fabric through the characteristic information generated by the fabric to ensure the smoothness of the fabric , so as to optimize the detection results. Based on the optimization of the detection results, the conveying speed of the cloth in the cloth detection system can be greatly increased, thereby improving the detection efficiency.

FIG. 1 is a schematic diagram of a cloth detection system 100 according to some embodiments of the present disclosure. The cloth detection system 100 of the present disclosure includes a detection chamber 110 , a first light source 120 , an imaging device 130 , a first roller 140 and a second roller 150 . The detection chamber 110 has a cloth inlet end I and a cloth outlet end O. In some embodiments, the cloth 50 can enter the interior of the detection chamber 110 from the cloth inlet end 1, and after the flatness control and related detection (for example, defect detection) are performed inside the detection chamber 110, it can be passed out of the detection chamber 110. The cloth end O is output, 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, knitted fabric, woven fabric, non-woven fabric or a combination thereof, and the fabric 50 may be patterned fabric. In some implementations, the detection cavity 110 may be a light-tight cavity, so as to prevent external light from affecting the flatness control of the cloth 50 , thereby improving 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 obliquely faces the first surface 51 of the cloth 50 . The first light source 120 is configured to provide light to the first surface 51 of the cloth 50 , so that the imaging device 130 can clearly capture the texture features of the first surface 51 of the cloth 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 cloth 50 can be between 10 cm and 20 cm, and the normal line of the first light-emitting surface 122 and the first The included angle θ1 of the normal line of the surface 51 can be between 30 degrees and 60 degrees (preferably between 40 degrees and 50 degrees), so that the texture features of the first surface 51 of the cloth 50 can be clearly presented.

The imaging element 130 is disposed in the detection cavity 110 and has an imaging surface 132 , and the imaging surface 132 is facing the first surface 51 of the fabric 50 , that is, the imaging surface 132 is parallel to the first surface 51 of the fabric 50 . The imaging device 130 is configured to convert the first surface 51 of the cloth 50 into an image pattern, so as to provide a control device, such as a server, to further control the flatness of the cloth 50 . In other words, the camera element 130 can be coupled to a control element such as a server. In some embodiments, the distance d2 between the imaging surface 132 of the imaging element 130 and the first surface 51 of the cloth 50 can be between 15 cm and 45 cm, and the normal line of the imaging surface 132 and the first light source 120 The included angle θ2 of the normal line of the light emitting surface 122 can 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 implementations, the imaging device 130 may be, for example, a charge-coupled device.

The first roller 140 and the second roller 150 are respectively arranged at the cloth inlet end I and the cloth outlet O of the detection chamber 110 to control the speed at which the cloth 50 enters the detection chamber 110 and the speed at which it is output from the detection chamber 110 . In detail, the rotational speeds of the first roller 140 and the second roller 150 can respectively control the speed at which the cloth 50 enters the detection chamber 110 and the speed at which it is output from the detection chamber 110 . 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 respective rotational speeds of the first roller 140 and the second roller 150 can be adjusted by the control element. 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 smaller than the second height h2. In this way, the smoothness of the cloth 50 in 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 transport the cloth 50 . In some embodiments, the third roller 160 is only used to support the cloth 50 , but not to adjust the rotational speed of the cloth 50 . That is to say, the rotation speed of the third roller 160 changes with the relative rotation speeds of the first roller 140 and the second roller 150 .

In some implementations, the cloth detection system 100 may further include a second light source 170, which is disposed in the detection chamber 110 and has a second light emitting surface 172, and the second light emitting surface 172 is the second light source 170 facing the cloth 50 forward. The surface 53 , 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 cloth 50 to further penetrate the inner layer of the cloth 50, so that the imaging device 130 can clearly photograph the texture features of the inner layer of the cloth 50 close to the first surface 51, thereby Improve the accuracy of the flatness control of the cloth 50. In some implementations, the illumination intensity of the second light source 170 may be greater than that of the first light source 120 . Through the configuration of the second light source 170 , the cloth inspection system 100 of the present disclosure is applicable to the cloth 50 having a certain thickness h. For example, the thickness h of the cloth 50 may be between 0.08 mm 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 cloth 50 can be between 10 cm and 20 cm, so that the cloth 50 is close to the inner surface of the first surface 51 Textural features of the layers are clearly presented.

In some implementations, the cloth detection system 100 may further include a third light source 180, which surrounds the imaging surface 132 of the imaging element 130, so as to increase the light intensity irradiated on the first surface 51 of the cloth 50, so that the first surface 51 of the cloth 50 Textural features of surface 51 (and inner layers adjacent to first surface 51 ) are more clearly present. In some embodiments, the third light emitting surface 182 of the third light source 180 may face 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 implementations, the third light emitting surface 182 and the imaging surface 132 of the imaging device 130 may be substantially coplanar.

It should be understood that the connection relationship and functions of the components that have been described will not be repeated, and will be described first. In the following description, a method of controlling the flatness of the cloth using the cloth detection system 100, that is, a method for controlling the flatness of the cloth will be described.

FIG. 2 is a flow chart of a method for controlling flatness of fabrics according to some embodiments of the present disclosure. Please refer to Figure 1 and Figure 2. The flatness control method for 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 cavity 110 . In step S12, the first surface 51 of the cloth 50 is converted into an image pattern. In step S13, feature information of the image pattern is generated. In step S14, it is judged whether the moving average of the characteristic information falls within the standard range. If the moving average does not fall within the standard range, in step S15, the conveying speed of the cloth 50 is adjusted. If the moving average falls within the standard range, then in step S16, the conveying speed of the cloth 50 is maintained. In the following description, the above-mentioned steps will be further described.

First, in step S10, a cloth detection system 100 as shown in FIG. 1 is provided. Next, in step S11 , the cloth 50 is introduced into the detection cavity 110 through the first roller 140 and the second roller 150 . In some embodiments, the cloth 50 can 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 detection chamber 110, the first roller 140, the second roller 150, and the plurality of third rollers 160 can have the same rotational speed, so as to well control the conveying condition of the cloth 50 .

Subsequently, in step S12, at least through the light provided by the first light source 120, the texture features of the first surface 51 of the cloth 50 and/or some blocks of the inner layer close to the first surface 51 are clearly presented, The imaging device 130 converts the first surface 51 and/or the partial blocks 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 can 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 (for example, a thickness h between 0.08 mm and 0.2 mm), the second light source 170 and/or the third light source 180 can be turned off; When the thickness h is larger (for example, the thickness h between 0.2mm and 0.5mm), the second light source 170 and the third light source 180 can be turned on. In this way, the cloth flatness control method disclosed in the present disclosure can effectively achieve the effect of saving energy and electricity. After this step is completed, the fabric inspection system 100 can at least transmit through the first light source 120 and the imaging device 130 to convert at least a partial block of the first surface 51 of the fabric 50 into an image pattern. In some embodiments, the image pattern can be transmitted to a control element such as a server for subsequent use and interpretation.

Next, in step S13 , the feature information of the image pattern is generated through a control element such as a server. In some embodiments, the characteristic information may include the total brightness value of the image pattern. Specifically, a single image pattern may have multiple pixels, each pixel may have a brightness value (for example, any value from 0 to 255), and the brightness value of each pixel may be added to obtain the The total brightness value of the image pattern is obtained, that is, the characteristic information of the image pattern is obtained.

Subsequently, in step S14, it is determined whether the moving average of the characteristic information falls within the standard range through the control element. In some implementations, the moving average of feature information may be established based on 18 to 22 pieces of feature information, for example, based on 20 pieces of feature information. In detail, the aforementioned steps S10 to S13 can be used to generate continuous multiple pieces of feature information (multiple pieces of total brightness value), and the continuous multiple pieces of feature information are added and divided by the number of strokes (for example, divided by 20 strokes) ), the moving average of the feature information can be obtained.

In some embodiments, before the cloth 50 is introduced into the detection chamber 110 (for example, before step S11), the test cloth can be used to establish a standard range as the basis for the initial judgment of the moving average, thereby increasing the detection reliability of the cloth detection system 100 sex. Specifically, the method for establishing the standard range can be referred to FIG. 3 , which is a flow chart of 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 fabric is converted into a test image pattern. In step S21, the test total brightness value of the test image pattern is calculated. In step S22, step S20 to step S21 are repeated to obtain the total brightness value of multiple tests. In step S23, a database is established with multiple test total brightness values. In step S24, a standard range is established according to the total brightness values of multiple tests in the database.

To establish a standard range, firstly, a test cloth and the cloth inspection system 100 shown in FIG. 1 can be 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 can be, for example, knitted fabric, woven fabric, non-woven fabric or a combination thereof, and the test fabric can be a standard sample of the aforementioned fabric 50 , so that the established standard range is applicable to the aforementioned fabric 50 . In more detail, as a standard sample, the test fabric may have the same base material and the same image or color as the fabric 50 if it is confirmed to be flawless. In a preferred embodiment, the specification of the test fabric (eg, weaving density, basis weight, etc.) may be the same as that of the aforementioned fabric 50, so as to improve the applicability of the standard range.

Next, in step S20 , at least through the light provided by the first light source 120 , the texture features of the surface area of the test cloth are clearly presented, so that the imaging device 130 is provided to convert the surface area into a test image pattern. Similar to the aforementioned 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 fabric, so as to effectively achieve the effect of energy saving. After completing this step, the fabric inspection system 100 can at least convert the surface area of the test fabric into a test image pattern through at least the first light source 120 and the imaging device 130 . In some embodiments, the area and shape of the test image pattern generated by the test fabric are the same as those of the aforementioned image pattern generated by the fabric 50 , so as to improve the accuracy of controlling the flatness of the fabric 50 . In some embodiments, the test image pattern can be transmitted to a control element such as a server for subsequent use and interpretation.

Subsequently, in step S21, the characteristic information of the test image pattern is generated through the control element. In some embodiments, the feature information may include a test total brightness value of the test image pattern. Specifically, a single test image pattern may have a plurality of pixels, each pixel may have a test brightness value (for example, any value from 0 to 255), and the test brightness values of each pixel may be added together to obtain The test total brightness value of the test image pattern can be obtained, that is, the feature information of the test image pattern can be obtained. In other words, in step S21, the feature information of the test image pattern is generated by calculating the test total brightness value of the test image pattern.

Next, in step S22, the aforementioned steps S20 and S21 are repeated to obtain the total brightness values of multiple tests. Subsequently, in step S23, a database is established with multiple test total brightness values. In detail, after step S23 is completed, the database may include characteristics of the test cloth (for example, specifications) and multiple test total brightness values corresponding to multiple surface areas of the test cloth.

Next, in step S24, a standard range is established according to the total brightness values of multiple tests of the test fabrics in the database. In some embodiments, 18 to 22 (preferably 20) test total brightness values of the test fabrics in the database can be used to establish a standard range. Specifically, the numerical value obtained by [(the maximum value in the total brightness value of multiple tests)×95%)] can be used as the upper limit of the standard range; and [(the maximum value in the total brightness value of multiple tests) can be used Minimum value) × 105%] value, as the lower limit of the standard range. In other words, in step S24, the maximum value and the minimum value of the total brightness values of multiple tests can be used to establish the upper limit value and lower limit value of the standard range respectively, and the test results compared with the test fabric can be used More stringent specifications are used to establish standard ranges 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 in FIG. 2 , and judge whether the moving average of the characteristic information falls within the standard range through the control element. For details, please refer to FIG. 4A to FIG. 4C , which are schematic diagrams of determining whether the moving average of feature information falls within a standard range according to different embodiments of the present disclosure. In the embodiment of FIG. 4A , since the 20 consecutive pieces of characteristic information of the cloth 50 (that is, the total brightness values of 20 consecutive pieces) all fall within the standard range, the moving average of the characteristic information of the cloth 50 will also fall into the standard range. Within the range, it means that the cloth 50 has good flatness at this time, so the conveying speed of the cloth 50 does not need to be adjusted. In the embodiment of Fig. 4B, although the 20th 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 there is no need to adjust the conveying of the cloth 50 speed. In the embodiment of FIG. 4C , the 20th feature information of the cloth 50 does not fall within the standard range, and the moving average of the characteristic information of the cloth 50 does not fall within the standard range. At this time, the conveying of the cloth 50 needs to be adjusted. Speed, to ensure that the cloth 50 has good flatness. In some embodiments, when the moving average of the characteristic information of the fabric 50 does not fall within the standard range, the conveying speed of the fabric 50 can 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 of the standard range, the rotational speed of the second roller 150 can be increased or the rotational speed of the first roller 140 can be reduced; When the moving average value is less than the lower limit of the standard range, the rotation speed of the second roller 150 can be reduced or the rotation speed of the first roller 140 can be increased.

It is worth mentioning that, since the moving average of the characteristic information disclosed in this disclosure is established based on 18 to 22 consecutive pieces of characteristic information, the fabric detection system 100 does not need to detect that a single piece of characteristic information exceeds the standard range every time. , just be anxious to adjust the conveying speed of cloth 50. In this way, it is possible to prevent the cloth detection system 100 from adjusting the conveying speed of the cloth 50 too frequently when the flatness of the cloth 50 is still within an acceptable range, so as to save energy and improve work efficiency, and extend the length of the cloth 50. The service life of the detection system 100 is detected. In addition, since the flatness of the cloth 50 can be well controlled through the cloth inspection system 100 , the conveying speed of the cloth 50 in the cloth inspection system 100 can be greatly increased, thereby improving the inspection efficiency. Specifically, when using the cloth detection system 100 of the present disclosure to control the smoothness of the cloth 50 on the cloth 50, the conveying speed of the cloth 50 can be greater than 40 m/min, and preferably can be between 60 m/min to 60 m/min. 80m/min.

According to the above-mentioned embodiments of the present disclosure, the cloth inspection system of the present disclosure includes a first light source, an imaging element, a first roller and a second roller, so as to generate an image pattern from the cloth to be inspected, and further generate features from the image pattern information. The fabric detection system can adjust the conveying speed of the fabric through characteristic information to ensure the smoothness of the fabric. In this way, the detection results of the subsequent inspection of the cloth (for example, defect detection) can be optimized, and the conveying speed of the cloth in the cloth inspection system can be greatly increased, thereby improving the detection efficiency.

Although the present disclosure has been disclosed above in terms of implementation, it is not intended to limit this disclosure. Any person familiar with the art may make various changes and modifications without departing from the spirit and scope of this disclosure. Therefore, this disclosure The scope of protection should be based on the scope defined by the appended claims.

Claims (10)

1. a cloth detection system, is characterized in that, for controlling the flatness of cloth, described cloth detection system comprises: The detection chamber has a cloth inlet end and a cloth outlet end; a first light source, arranged in the detection chamber, wherein the first light source has a first light-emitting surface, and the first light-emitting surface is obliquely facing the first surface of the cloth; An imaging element is arranged in the detection cavity, wherein the imaging element has an imaging surface, and the imaging surface is facing the first surface of the cloth; a first roller configured at the cloth-incoming end of the detection chamber to control the speed at which the cloth enters the detection chamber; and The second roller is arranged at the cloth outlet end of the detection chamber to control the speed at which the cloth is output from the detection chamber. 2. The cloth detection system according to claim 1, further comprising: The second light source is arranged in the detection cavity, wherein the second light source has a second light-emitting surface, the second light-emitting surface is the second surface facing the cloth, and the second surface is opposite to the first surface. 3. The cloth detection system according to claim 1, further comprising: The third light source is arranged in the detection chamber and surrounds the imaging surface of the imaging element. 4. A method for controlling the smoothness of cloth, comprising: The cloth detection system as claimed in claim 1 is provided; introducing the cloth 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 imaging device; generating feature information of the image pattern; judging whether the moving average of the feature information falls within a standard range; and If the moving average does not fall within the standard range, adjust the conveying speed of the cloth. 5 . The method for controlling flatness of cloth according to claim 4 , wherein the characteristic information of the image pattern includes a total brightness value of the image pattern. 6 . 6. The method for controlling the flatness of cloth according to claim 4, characterized in that, when the moving average of the feature information does not fall within the standard range, the second roller is adjusted speed. 7 . The method for controlling the flatness of cloth according to claim 4 , wherein the moving average is established based on 18 to 22 pieces of the characteristic information. 8. The flatness control method for cloth according to claim 4, further comprising: converting the surface area of the test fabric into a test image pattern through the first light source and the imaging device; calculating the test total luminance value of the test image pattern; Repeat the above steps to obtain multiple test total brightness values; Establishing a database with multiple test total brightness values; and The standard range is established according to multiple test total brightness values in the database. 9. The flatness control method for cloth according to claim 8, characterized in that, establishing the standard range comprises: establishing the upper limit of the standard range by using the maximum value of the plurality of test total luminance values; and The lower limit value of the standard range is established by using the minimum value of the plurality of test total brightness values. 10. The flatness control method for cloth according to claim 8, wherein 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 those of the test image. The image pattern has the same area and shape.

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