Flatness control method for fabrics

Abstract

A fabric detection system and a method for controlling the flatness of fabric. The fabric detection system is used to control the flatness of the fabric and includes a detection chamber, a first light source, an imaging element, a first roller, and a second roller. The detection chamber has a fabric inlet end and a fabric outlet end. The first light source is disposed in the detection chamber and has a first light-emitting surface, and the first light-emitting surface obliquely faces the first surface of the fabric. The imaging element is disposed in the detection chamber and has an imaging surface, and the imaging surface directly faces the first surface of the fabric. The first roller is disposed at the fabric inlet end of the detection chamber to control the speed at which the fabric enters the detection chamber. The second roller is disposed at the fabric outlet end of the detection chamber to control the speed at which the fabric is output from the detection chamber. The fabric detection system disclosed herein can optimize the detection results of the fabric and significantly improve the detection efficiency.

Description

Technical Field

[0001] The present disclosure relates to a fabric inspection system and an operation method thereof, and particularly to a fabric inspection system for controlling the flatness of a fabric and a method for controlling the flatness of a fabric. Background Art

[0002] In the production process of textiles, the quality inspection and control of fabrics are very important. During the inspection process of fabrics, if the flatness of the fabric is insufficient, it is easy to cause missed inspections or false inspections. At present, the fabric inspection machine cannot meet the requirements of the flatness of fabrics under high-speed inspection needs. Therefore, how to simultaneously meet the inspection efficiency of fabrics and maintain the flatness of fabrics remains an actively studied topic for textile manufacturers. Summary of the Invention

[0003] The present disclosure provides a fabric inspection system and a method for controlling the flatness of a fabric, which can ensure the flatness of the fabric, thereby optimizing the inspection results of the fabric and greatly improving the inspection efficiency.

[0004] According to some embodiments of the present disclosure, a fabric inspection system for controlling the flatness of a fabric includes an inspection chamber, a first light source, an imaging element, a first roller, and a second roller. The inspection chamber has a fabric inlet end and a fabric outlet end. The first light source is disposed in the inspection chamber and has a first light-emitting surface, and the first light-emitting surface obliquely faces the first surface of the fabric. The imaging element is disposed in the inspection chamber and has an imaging surface, and the imaging surface directly faces the first surface of the fabric. The first roller is disposed at the fabric inlet end of the inspection chamber to control the speed of the fabric entering the inspection chamber. The second roller is disposed at the fabric outlet end of the inspection chamber to control the speed of the fabric output from the inspection chamber.

[0005] In some embodiments of the present disclosure, the fabric inspection system further includes a second light source disposed in the inspection chamber. The second light source has a second light-emitting surface, and the second light-emitting surface directly faces the second surface of the fabric, and the second surface is opposite to the first surface.

[0006] In some embodiments of the present disclosure, the fabric 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.

[0007] According to some embodiments of the present disclosure, a method for controlling the flatness of a fabric includes the following steps. Provide the aforementioned fabric inspection system. Introduce the fabric into the inspection chamber through the first roller and the second roller. Convert the first surface of the fabric into an image pattern through the first light source and the imaging element. Generate feature information of the image pattern. Determine whether the moving average value of the feature information falls within a standard range. If the moving average value does not fall within the standard range, adjust the conveying speed of the fabric.

[0008] In some embodiments of the present disclosure, the characteristic information of the image pattern includes the total brightness value of the image pattern.

[0009] In some embodiments of the present disclosure, when the moving average value of the characteristic information does not fall within the standard range, the rotation speed of the second roller is adjusted.

[0010] In some embodiments of the present disclosure, the moving average value is established based on 18 to 22 pieces of characteristic information.

[0011] In some embodiments of the present disclosure, the method for controlling the flatness of the fabric further includes the following steps. The surface area of the test fabric is converted into a test image pattern through a first light source and an imaging element. The total test brightness value of the test image pattern is calculated. The above steps are repeated to obtain multiple total test brightness values. A database is established with the multiple total test brightness values. A standard range is established based on the multiple total test brightness values in the database.

[0012] In some embodiments of the present disclosure, establishing the standard range includes the following steps. The upper limit value of the standard range is established using the maximum value among the multiple total test brightness values. The lower limit value of the standard range is established using the minimum value among the multiple total test brightness values.

[0013] In some embodiments of the present disclosure, the base material of the test fabric is the same as that of the fabric, and the area and shape of the test image pattern are the same as those of the image pattern.

[0014] According to the above embodiments of the present disclosure, the fabric detection 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 fabric to be detected, and further generate characteristic information from the image pattern. The fabric detection system can adjust the conveying speed of the fabric through the characteristic information, thereby ensuring the flatness of the fabric. In this way, the detection results of the fabric in subsequent detection (for example, defect detection) can be optimized, and the conveying speed of the fabric in the fabric detection system can be greatly increased, thereby improving the detection efficiency. Description of the Drawings

[0015] To make the above and other objects, features, advantages, and embodiments of the present disclosure more obvious and understandable, the description of the accompanying drawings is as follows:

[0016] Figure 1 A schematic diagram showing a fabric detection system according to some embodiments of the present disclosure;

[0017] Figure 2 A flowchart showing a method for controlling the flatness of a fabric according to some embodiments of the present disclosure;

[0018] Figure 3A flowchart showing a method for establishing a standard range according to some embodiments of the present disclosure; and

[0019] Figures 4A to 4C A schematic diagram showing whether the moving average of the judgment characteristic information falls within the standard range according to different embodiments of the present disclosure.

[0020]

Symbol Description

[0021] 50: Fabric

[0022] 51: First surface

[0023] 53: Second surface

[0024] 100: Fabric detection system

[0025] 110: Detection chamber

[0026] 112: Bottom surface

[0027] 120: First light source

[0028] 122: First light-emitting surface

[0029] 130: Imaging element

[0030] 132: Imaging surface

[0031] 140: First roller

[0032] 150: Second roller

[0033] 160: Third roller

[0034] 170: Second light source

[0035] 172: Second light-emitting surface

[0036] 180: Third light source

[0037] 182: Third light-emitting surface

[0038] I: Inlet end of fabric

[0039] O: Outlet end of fabric

[0040] h1: First height

[0041] h2: Second height

[0042] h: Thickness

[0043] d1~d3: Distance

[0044] θ1~θ2: Angle

[0045] S10~S16, S20~S24: Steps Detailed Implementation Modes

[0046] The following will disclose multiple implementation modes of the present disclosure with the accompanying drawings. For the sake of clear illustration, many practical details will be described together in the following narrative. However, it should be understood that these practical details should not be used to limit the present disclosure. That is to say, in some implementation modes of the present disclosure, these practical details are not necessary, so they should not be used to limit the present disclosure. In addition, for the purpose of simplifying the accompanying drawings, some well-known conventional structures and elements will be shown in a simple schematic manner in the drawings. Additionally, for the convenience of readers to view, the sizes of the elements in the drawings are not drawn in actual proportion.

[0047] It should be understood that although terms such as "first", "second", and "third" may be used herein to describe various elements, components, regions, layers, and / or parts, these elements, components, regions, and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer, or part from another element, component, region, layer, or part. Therefore, the "first element", "component", "region", "layer", or "part" described hereinafter may also be referred to as the second element, component, region, layer, or part without departing from the teachings herein.

[0048] The present disclosure provides a fabric detection system, which can be, for example, a fabric inspection machine, and can be configured to control the flatness of the fabric, thereby facilitating the detection of the fabric (e.g., defect detection). Through the configuration of the first light source, imaging 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 flatness of the fabric, thereby optimizing the detection result. Based on the optimization of the detection result, the conveying speed of the fabric in the fabric detection system can be significantly increased, thereby improving the detection efficiency.

[0049] Figure 1Schematic diagram showing a fabric detection system 100 according to some embodiments of the present disclosure. The fabric detection system 100 of the present disclosure includes a detection chamber 110, a first light source 120, an imaging element 130, a first roller 140, and a second roller 150. The detection chamber 110 has a fabric inlet I and a fabric outlet O. In some embodiments, the fabric 50 can enter the interior of the detection chamber 110 from the fabric inlet I, and after flatness control and related detections (such as defect detection) are performed inside the detection chamber 110, it is then output from the fabric outlet O of the detection chamber 110, where the fabric 50 can have opposite first surface 51 and second surface 53. In some embodiments, the fabric 50 can be, for example, knitted fabric, woven fabric, non-woven fabric, or a combination thereof, and the fabric 50 can be a patterned fabric. In some embodiments, the detection chamber 110 can be an opaque cavity to avoid the influence of external light on the flatness control of the fabric 50, thereby improving the accuracy of the flatness control of the fabric 50.

[0050] The first light source 120 is disposed in the detection chamber 110 and has a first light-emitting surface 122, and the first light-emitting surface 122 obliquely faces the first surface 51 of the fabric 50. The first light source 120 is configured to provide light to the first surface 51 of the fabric 50, so that the imaging element 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 can be between 10 cm and 20 cm, and the angle θ1 between the normal of the first light-emitting surface 122 and the normal of the first 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 fabric 50 are clearly presented.

[0051] The imaging element 130 is disposed in the detection chamber 110 and has an imaging surface 132, and the imaging surface 132 directly faces 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 element 130 is configured to convert the first surface 51 of the fabric 50 into an image pattern, so as to provide, for example, a control element such as a server for interpretation to further control the flatness of the fabric 50. In other words, the imaging 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 fabric 50 can be between 15 cm and 45 cm, and the angle θ2 between the normal of the imaging surface 132 and the normal of the first light-emitting surface 122 of the first light source 120 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 embodiments, the imaging element 130 can be, for example, a charge-coupled device.

[0052] The first roller 140 and the second roller 150 are respectively disposed at the cloth inlet end I and the cloth outlet end O of the detection chamber 110 to 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. Specifically, 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 to adjust the respective rotational speeds of the first roller 140 and the second roller 150 by the control element. In some embodiments, the first roller 140 can have a first height h1 relative to the bottom surface 112 of the detection chamber 110, the second roller 150 can have a second height h2 relative to the bottom surface 112 of the detection chamber 110, and the first height h1 can be less than the second height h2. In this way, the smoothness of the cloth 50 during transportation can be improved. In some embodiments, the cloth detection system 100 can further include a plurality of third rollers 160, and the third rollers 160 are disposed outside and / or inside the detection chamber 110 to stably transport the cloth 50. In some embodiments, the third rollers 160 are only used to support the cloth 50 and not to adjust the rotational speed of the cloth 50. That is, the rotational speed of the third rollers 160 changes with the relative rotational speeds of the first roller 140 and the second roller 150.

[0053] In some embodiments, the cloth detection system 100 can 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 faces the second surface 53 of the cloth 50 directly, 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 element 130 can clearly capture the texture features of the inner layer of the cloth 50 close to the first surface 51, thereby improving the accuracy of the flatness control of the cloth 50. In some embodiments, the illumination intensity of the second light source 170 can be greater than the illumination intensity of the first light source 120. By the configuration of the second light source 170, the cloth detection 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 can 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 texture features of the inner layer of the cloth 50 close to the first surface 51 are clearly presented.

[0054] In some embodiments, the fabric detection system 100 may further include a third light source 180 that surrounds the imaging surface 132 of the imaging element 130, thereby enhancing the light intensity irradiated onto the first surface 51 of the fabric 50, so that the texture features of the first surface 51 (and the inner layer close to the first surface 51) of the fabric 50 are presented more clearly. In some embodiments, the third light-emitting surface 182 of the third light source 180 may face the first surface 51 of the fabric 50 directly, that is, the third light-emitting surface 182 is parallel to the first surface 51 of the fabric 50. In some embodiments, the third light-emitting surface 182 and the imaging surface 132 of the imaging element 130 may be substantially coplanar.

[0055] It should be understood that the described element connection relationships and functions will not be repeated here for the sake of brevity. In the following description, a method for controlling the flatness of the fabric using the fabric detection system 100 will be described, that is, a method for controlling the flatness of the fabric will be described.

[0056] Figure 2 The flowchart of a method for controlling the flatness of a fabric according to some embodiments of the present disclosure is shown. Please refer to Figure 1 and Figure 2 . The method for controlling the flatness of the fabric includes steps S10 to S16. In step S10, the fabric detection system 100 is provided. In step S11, the fabric 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, the feature information of the image pattern is generated. In step S14, it is determined whether the moving average value of the feature information falls within the standard range. If the moving average value does not fall within the standard range, in step S15, the conveying speed of the fabric 50 is adjusted. If the moving average value falls within the standard range, then in step S16, the conveying speed of the fabric 50 is maintained. In the following description, each of the above steps will be further described.

[0057] First, in step S10, the fabric detection system 100 as Figure 1 shown is provided. Next, in step S11, the fabric 50 is introduced into the detection chamber 110 through the first roller 140 and the second roller 150. In some embodiments, the fabric 50 may be further introduced into the detection chamber 110 through a plurality of third rollers 160. In some embodiments, when the fabric 50 is initially introduced into the detection chamber 110, the first roller 140, the second roller 150, and the plurality of third rollers 160 may have the same rotational speed, so as to well control the conveying condition of the fabric 50.

[0058] 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 fabric 50 and / or some blocks of the inner layer close to the first surface 51 are clearly presented, so that the imaging element 130 can convert the first surface 51 and / or some 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 fabric 50. More specifically, when the fabric 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 fabric 50 has a relatively large thickness h (for example, a thickness h between 0.2 mm and 0.5 mm), the second light source 170 and the third light source 180 can be turned on. In this way, the method for controlling the flatness of the fabric disclosed in the present disclosure can effectively achieve the effect of energy saving and power saving. After completing this step, the fabric detection system 100 can at least convert some blocks of the first surface 51 of the fabric 50 into an image pattern through the first light source 120 and the imaging element 130. In some embodiments, the image pattern can be transmitted to a control element such as a server for subsequent use and interpretation.

[0059] Next, in step S13, the control element such as a server is used to generate the characteristic information of the image pattern. In some embodiments, the characteristic information may include the total brightness value of the image pattern. Specifically, a single image pattern may have a plurality of pixels, and each pixel may have a brightness value (for example, any value between 0 and 255). By adding up the brightness values of each pixel, the total brightness value of the image pattern can be obtained, that is, the characteristic information of the image pattern can be obtained.

[0060] Subsequently, in step S14, the control element is used to determine whether the moving average value of the characteristic information falls within the standard range. In some embodiments, the moving average value of the characteristic information may be established based on, for example, 18 to 22 pieces of characteristic information, such as based on 20 pieces of characteristic information. Specifically, a continuous plurality of pieces of characteristic information (a plurality of total brightness values) can be generated through the foregoing steps S10 to S13, and the sum of the continuous plurality of pieces of characteristic information is divided by the number of pieces (for example, divided by 20 pieces), and the moving average value of the characteristic information can be obtained.

[0061] In some embodiments, a test fabric can be used to establish a standard range as the initial judgment basis for the moving average value before the fabric 50 is introduced into the detection chamber 110 (for example, before step S11), so as to increase the detection reliability of the fabric detection system 100. Specifically, for the method of establishing the standard range, reference can be made to Figure 3, which shows a flowchart of a method for establishing a standard range according to some embodiments of the present disclosure. Specifically, the method for establishing a 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 total test brightness value of the test image pattern is calculated. In step S22, steps S20 to S21 are repeated to obtain multiple total test brightness values. In step S23, a database is established based on the multiple total test brightness values. In step S24, a standard range is established based on the multiple total test brightness values in the database.

[0062] Regarding the method for establishing a standard range, first, a test fabric and a fabric detection system 100 as shown in Figure 1 are provided, and the fabric 50 is introduced into the detection 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 aforementioned fabric 50, so that the established standard range is applicable to the aforementioned fabric 50. More specifically, as a standard sample, in the case of confirming no defects, the test fabric may have the same base material as the fabric 50 and have the same image or pattern. In a preferred embodiment, the specifications of the test fabric (e.g., knitting density, basis weight, etc.) may be the same as those of the aforementioned fabric 50, thereby improving the applicability of the standard range.

[0063] 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 fabric are clearly presented, so that the imaging element 130 can 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 to effectively achieve the effect of energy saving. After completing this step, the fabric detection system 100 can at least through the first light source 120 and the imaging element 130 to at least convert the surface area of the test fabric into a test image pattern. In some embodiments, the area and shape of the test image pattern generated by the test fabric are the same as the area and shape of the image pattern generated by the aforementioned fabric 50, thereby improving the accuracy of the flatness control 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.

[0064] Subsequently, in step S21, the control element is used to generate the characteristic information of the test image pattern. In some embodiments, the characteristic information may include the total test brightness value of the test image pattern. Specifically, a single test image pattern may have multiple pixels, and each pixel may have a test brightness value (e.g., any value from 0 to 255). By adding up the test brightness values of each pixel, the total test brightness value of the test image pattern can be obtained, that is, the characteristic information of the test image pattern is obtained. In other words, in step S21, the total test brightness value of the test image pattern is calculated to generate the characteristic information of the test image pattern.

[0065] Next, in step S22, the foregoing steps S20 and S21 are repeated to obtain multiple total test brightness values. Subsequently, in step S23, a database is established with the multiple total test brightness values. Specifically, after completing step S23, the database may include the characteristics (e.g., specifications) of the test fabric and the multiple total test brightness values corresponding to multiple surface blocks of the test fabric.

[0066] Next, in step S24, a standard range is established based on the multiple total test brightness values of the test fabric in the database. In some embodiments, the standard range may be established based on 18 to 22 (preferably 20) total test brightness values of the test fabric in the database. Specifically, the value obtained by [(the maximum value among the multiple total test brightness values) × 95%] can be used as the upper limit value of the standard range; and the value obtained by [(the minimum value among the multiple total test brightness values) × 105%] can be used as the lower limit value of the standard range. In other words, in step S24, the maximum and minimum values among the multiple total test brightness values can be used to establish the upper and lower limit values of the standard range respectively, and a more stringent specification compared to the test results of the test fabric can be adopted to establish the standard range, so as to improve the detection reliability of the fabric detection system 100. As described above, after completing step S24, the standard range can be established.

[0067] Subsequently, please return to Figure 2 step S14, and the control element is used to determine whether the moving average value of the characteristic information falls within the standard range. Specifically, please refer to Figures 4A to 4C which shows a schematic diagram of determining whether the moving average value of the characteristic information falls within the standard range according to different embodiments of the present disclosure. In Figure 4A the embodiment, since the consecutive 20 pieces of characteristic information (i.e., consecutive 20 total brightness values) of the fabric 50 all fall within the standard range, the moving average value of the characteristic information of the fabric 50 will also fall within the standard range, indicating that the fabric 50 has good flatness at this time, so the conveying speed of the fabric 50 does not need to be adjusted. In Figure 4BIn the embodiment, although the 20th piece of characteristic information of the fabric 50 does not fall within the standard range, the moving average of the characteristic information of the fabric 50 still falls within the standard range. Therefore, it is not necessary to adjust the conveying speed of the fabric 50. In Figure 4C In the embodiment, the 20th piece of characteristic information of the fabric 50 does not fall within the standard range, and the moving average of the characteristic information of the fabric 50 also does not fall within the standard range. At this time, it is necessary to adjust the conveying speed of the fabric 50 to ensure that the fabric 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. More specifically, when the moving average of the characteristic information of the fabric 50 is greater than the upper limit value of the standard range, the rotation speed of the second roller 150 can be increased or the rotation speed of the first roller 140 can be decreased; when the moving average of the characteristic information of the fabric 50 is less than the lower limit value of the standard range, the rotation speed of the second roller 150 can be decreased or the rotation speed of the first roller 140 can be increased.

[0068] It is worth mentioning that since the moving average of the characteristic information disclosed herein is established based on 18 to 22 consecutive pieces of characteristic information, the fabric detection system 100 does not need to be eager to adjust the conveying speed of the fabric 50 every time a single piece of characteristic information is detected to exceed the standard range. In this way, it is possible to avoid the fabric detection system 100 from adjusting the conveying speed of the fabric 50 too frequently when the flatness of the fabric 50 is still within an acceptable range, thereby achieving the effects of energy saving and power saving, improving work efficiency, and extending the service life of the fabric detection system 100. In addition, since the flatness of the fabric 50 can be well controlled by the fabric detection system 100, the conveying speed of the fabric 50 in the fabric detection system 100 can be greatly increased, thereby improving the detection efficiency. Specifically, when using the fabric detection system 100 disclosed herein to control the flatness of the fabric 50, the conveying speed of the fabric 50 can be, for example, greater than 40 m / min, and preferably, for example, between 60 m / min and 80 m / min.

[0069] According to the above embodiments of the present disclosure, the fabric detection 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 fabric to be detected, and further generate characteristic information from the image pattern. The fabric detection system can adjust the conveying speed of the fabric through the characteristic information, thereby ensuring the flatness of the fabric. In this way, the detection result of the fabric in subsequent detection (for example, defect detection) can be optimized, and the conveying speed of the fabric in the fabric detection system can be greatly increased, thereby improving the detection efficiency.

[0070] Although the present disclosure has been disclosed as above in embodiments, it is not intended to limit the present disclosure. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the scope defined by the appended claims.

Claims

1. A method for controlling the flatness of fabric, characterized in that, it includes: providing a fabric detection system, wherein the fabric detection system includes: a detection chamber having a fabric inlet end and a fabric outlet end; a first light source disposed in the detection chamber, wherein the first light source has a first light-emitting surface, and the first light-emitting surface obliquely faces the first surface of the fabric; an imaging element disposed in the detection chamber, wherein the imaging element has an imaging surface, and the imaging surface directly faces the first surface of the fabric; a first roller disposed at the fabric inlet end of the detection chamber to control the speed of the fabric entering the detection chamber; and a second roller disposed at the fabric outlet end of the detection chamber to control the speed of the fabric output from the detection chamber; introducing the fabric into the detection chamber through the first roller and the second roller; converting the first surface of the fabric into an image pattern through the first light source and the imaging element; generating characteristic information of the image pattern; judging whether the moving average value of the characteristic information falls within a standard range, wherein the moving average value is obtained by adding consecutive multiple pieces of characteristic information and then dividing by the number of pieces; and if the moving average value does not fall within the standard range, adjusting the conveying speed of the fabric.

2. The method for controlling the flatness of fabric according to claim 1, characterized in that, the characteristic information of the image pattern includes the total brightness value of the image pattern.

3. The method for controlling the flatness of fabric according to claim 1, characterized in that, when the moving average value of the characteristic information does not fall within the standard range, adjusting the rotation speed of the second roller.

4. The method for controlling the flatness of fabric according to claim 1, characterized in that, the moving average value is established based on 18 to 22 pieces of the characteristic information.

5. The method for controlling the flatness of fabric according to claim 1, characterized in that, it further includes: converting the surface area of a test fabric into a test image pattern through the first light source and the imaging element; calculating the total test brightness value of the test image pattern; repeating the above steps to obtain multiple pieces of the total test brightness value; establishing a database with multiple pieces of the total test brightness value; and establishing the standard range according to multiple pieces of the total test brightness value in the database.

6. The method for controlling the flatness of fabric according to claim 5, characterized in that, establishing the standard range includes: using the maximum value among multiple pieces of the total test brightness value to establish the upper limit value of the standard range; and using the minimum value among multiple pieces of the total test brightness value to establish the lower limit value of the standard range.

7. The method for controlling the flatness of fabric according to claim 5, characterized in that, the base material of the test fabric is the same as that of the fabric, and the area and shape of the test image pattern are the same as those of the image pattern.

Images