Paper uniformity online detection method and detection device

Abstract

The invention discloses a paper uniformity online detection method and a detection device, and relates to the technical field of paper detection.The paper uniformity online detection method comprises the steps that paper is moved to an irradiation area through a driving roller, a detection light source irradiates the paper, the light source penetrating through the paper irradiates a receiver, and a detection image is formed; the image acquisition device generates an electronic image from the detection image; the image analysis device performs image comparison according to the comparison image and the electronic image to generate a first image information mark and a second image information mark; the paper is cut and removed according to the first image information mark of the image mark, and the paper is cut and reserved according to the second image information mark of the image mark; and the paper marked by the second image information is laid on the glass to form a material so as to complete treatment of the paper, according to the mode, the qualified interval paper can be treated, and the treatment efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of paper detection, and in particular to an online detection method and a detection device for paper uniformity. Background Art

[0002] In the paper manufacturing and processing industry, paper uniformity is one of the important indicators for measuring paper quality. Paper with poor uniformity often has problems such as uneven fiber distribution, inconsistent thickness, and large differences in light transmittance. These problems not only affect the appearance and feel of the paper, but may also reduce its physical properties and service life. Therefore, in the paper production process, it is very important to accurately and efficiently detect paper uniformity.

[0003] Traditional paper uniformity detection methods mostly use manual visual inspection or simple mechanical measurement methods, which have many shortcomings. For example, manual visual inspection is easily affected by subjective factors, and detection accuracy and consistency are difficult to guarantee; while mechanical measurement methods can often only detect certain physical parameters of paper, such as thickness, weight, etc., and cannot fully reflect the uniformity of paper.

[0004] With the continuous development of computer technology and image processing technology, paper uniformity detection methods based on image analysis have gradually emerged. This method collects images of the paper surface and uses image processing algorithms to analyze and process the images, thereby accurately detecting the paper uniformity. However, most of the existing paper uniformity detection methods based on image analysis have problems such as low detection accuracy, slow detection speed, and poor adaptability, which are difficult to meet the actual needs of large-scale production. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention provides an online detection method for paper uniformity, comprising:

[0006] Step 1: Paper Exposure

[0007] The paper is moved to the irradiation area by the driving roller, and the detection light source irradiates the paper, and the light source passing through the paper is irradiated onto the receiver to form a detection image;

[0008] Step 2: Image acquisition

[0009] The image acquisition device detects the image on the receiver and generates an electronic image from the detected image;

[0010] Step 3: Image Processing

[0011] The image analyzing device processes the electronic image, wherein a comparison image is preset in the image analyzing device, and the image analyzing device performs image comparison based on the comparison image and the electronic image to generate an image mark, wherein the image mark includes a first image information mark at a position where the electronic image is different from the comparison image and a second image information mark at a position where the electronic image is the same as the comparison image;

[0012] Step 4: Paper cutting

[0013] Cut and remove the paper according to the first image information mark of the image mark, and cut and retain the paper according to the second image information mark of the image mark;

[0014] Step 5: Paper Laying

[0015] The paper marked with the second image information is laid on glass to form a material, thereby completing the processing of the paper.

[0016] Optionally, in some embodiments of the present application, in step 1:

[0017] The irradiation area is a rectangular area, and the size of the irradiation area is the same as the size of the glass. The detection light source irradiates the paper in the irradiation area in parallel, and the light path direction of the detection light source is perpendicular to the movement direction of the paper.

[0018] Optionally, in some embodiments of the present application, in step 1;

[0019] A receiving surface is arranged on the receiver at a side facing the paper, and the area of ​​the receiving surface is the same as the area of ​​the irradiation area.

[0020] Optionally, in some embodiments of the present application, in step 3, the process of processing the electronic image by the image analysis device includes:

[0021] Step 301:

[0022] The image analysis device performs color inversion processing on the electronic image and the comparison image, and performs binarization processing on the color inversion processed image;

[0023] Step 302:

[0024] The image analysis device captures the color contour of the image after binary processing, and highlights the captured and recognized contour with a contour line;

[0025] Step 303:

[0026] The image analysis device compares the color of the image enclosed by the contour line with the comparison image. When the comparison images are inconsistent, they are marked as the first image information mark; when the comparison images are consistent, they are marked as the second image information mark. Both the first image information mark and the second image information mark include the contour line.

[0027] Optionally, in some embodiments of the present application, in step 3, the image analysis device is also preset with a preset transmittance, and the image analysis device detects the transmittance in the second image information mark of the paper. When the transmittance of the paper is less than or greater than the preset transmittance, the image analysis device marks the range of the second image information mark that does not meet the preset transmittance as the first image information mark.

[0028] Optionally, in some embodiments of the present application, the preset light transmittance is 48% to 65%.

[0029] Optionally, in some embodiments of the present application, in step 3, the image analysis device is further provided with a tangent mark. When the image analysis device is marked with the first image information, the image analysis device performs a tangent mark in a direction perpendicular to the direction of movement of the paper, and the tangent mark is tangent to the contour line of the first image information.

[0030] Optionally, in some embodiments of the present application, in step 4:

[0031] The cutting device is electrically connected to the image analyzing device, and the cutting device cuts the paper according to the cutting mark.

[0032] Optionally, in some embodiments of the present application, in step 4, when the range enclosed by the contour line in the second image information mark is greater than or equal to the irradiated area, the image analysis device generates ID information for the area enclosed by the contour line in the second image information mark;

[0033] The ID information is the same as the ID information of the glass.

[0034] Optionally, an embodiment of the present application further provides a detection device, the detection device comprising:

[0035] A detection box, wherein a detection chamber and a black chamber interlayer are provided in the detection box, a reel is provided in the detection chamber, the reel stores paper, the paper includes spacer paper, the black chamber interlayer is provided with a first opening and a second opening, the paper enters the black chamber interlayer through the first opening, and the paper leaves the black chamber interlayer through the second opening;

[0036] A driving roller and an ironing wheel are both arranged in the interlayer of the black chamber, the driving roller and the ironing wheel are respectively arranged at two sides of the paper, and the ironing wheel clamps and irons the paper, and the driving roller drives the paper to move;

[0037] A detection light source is arranged in the interlayer of the black chamber, and the detection light source irradiates the paper;

[0038] A receiver, arranged at a side of the paper relative to the detection light source;

[0039] An image acquisition device, disposed in the black chamber interlayer, the image acquisition device acquires the image on the receiver;

[0040] An image analysis device receives the electronic image of the image acquisition device, and the image analysis device analyzes and processes the electronic image;

[0041] A cutting device is used to cut the paper.

[0042] Compared with the prior art, the beneficial effects of the present invention are:

[0043] 1. High-precision detection: Through image analysis technology, quality problems on the spacer paper can be accurately identified, mainly foreign matter in the fibers.

[0044] 2. Automatic cutting: The cutting device is electrically connected to the image analysis device, which can automatically cut out unqualified parts according to the analysis results to improve production efficiency.

[0045] 3. Light transmittance detection: In addition to visual detection, light transmittance detection is added to further ensure paper quality.

[0046] 4. ID information matching: By generating and matching ID information, it ensures that the cut spacer paper and glass can accurately correspond to each other, which is convenient for subsequent combination and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0048] Figure 1 A schematic diagram of the overall process of the online detection method for paper uniformity provided in an embodiment of the present application;

[0049] Figure 2A schematic diagram of the overall process of processing the electronic image by the image analysis device provided in an embodiment of the present application;

[0050] Figure 3 A schematic diagram of the overall structure of the detection device provided in the embodiment of the present application;

[0051] Figure 4 A schematic diagram of the image slot processing process after binarization provided in an embodiment of the present application.

[0052] Description of reference numerals:

[0053] 100, detection box; 110, black room interlayer; 120, detection chamber; 130, first opening; 140, second opening; 150, reel; 200, driving roller; 300, ironing wheel; 400, detection light source; 500, receiver; 600, image acquisition device; 700, cutting device; 800, glass. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present application. It is understandable that the drawings are only provided for reference and illustration, and are not used to limit the present application. The connection relationship shown in the drawings is only for the convenience of clear description and does not limit the connection method.

[0055] Specifically, Figure 1 As shown, the embodiment of the present application provides a detection device and an online detection method for paper uniformity, wherein the detection method is mainly performed by the detection device, wherein the detection device as a whole is provided with a detection box 100, wherein the detection box 100 is provided with a detection chamber 120 and a black chamber interlayer 110, wherein a reel 150 is provided in the detection chamber 120, and the reel 150 stores the spacer paper to be tested, and the spacer paper enters the black chamber interlayer 110 through a driving roller 200, and the black chamber interlayer 110 is an internal space that is nearly fully enclosed, and only a first opening 130 and a second opening 140 are provided on the black chamber interlayer 110, wherein the first opening 130 is connected to the detection chamber 120, so that the spacer paper can enter the black chamber interlayer 110 through the first opening 130, and the second opening 140 is connected to the external position of the detection box 100, so that the spacer paper can be led out through the second opening 140.

[0056] In the black room interlayer 110, a detection light source 400 and a receiver 500 are provided. The detection light source 400 and the receiver 500 are respectively arranged on both sides of the spacer paper. The detection light source 400 irradiates the spacer paper so that the corresponding irradiation pattern is received on the receiver 500 to form a detection image.

[0057] In which, during the irradiation process, the irradiation area is a rectangular area, and the size of the rectangular area should be set to be the same as the corresponding glass 800. The glass 800 is set outside the detection box 100. When the spacer paper is led out of the detection box 100, the spacer paper is cut by the cutting device 700, and the cut spacer paper is placed on the glass 800 to form the corresponding material.

[0058] And during the irradiation process, the detection light source 400 irradiates the spacer paper vertically, so that on the spacer paper, the light source is a surface light source, and the area of ​​the surface light source is the same as the size of the glass 800, so that when the light source detects that there is no problem with the spacer paper, the spacer paper in this area can be directly combined with the glass 800 to form a material.

[0059] In the above, the detection of the spacer paper is performed by analyzing and processing the image on the receiver 500. A receiving surface is provided on the side of the receiver 500 facing the paper. The size of the receiving surface is equal to the size of the illuminated area, so that the texture on the spacer paper can be projected onto the receiving surface to form a detection image for easy detection.

[0060] The image detection on the receiving surface is firstly performed by the image acquisition device 600 to acquire the image on the receiving surface, so that the image acquisition device 600 can convert the detected image into an electronic image, such as Figure 3 shown.

[0061] In the embodiment of the present application, the image acquisition device 600 is configured as a camera.

[0062] The image acquisition device 600 transmits the electronic image to the image analysis device, which is an analysis system. The analysis system analyzes and processes the corresponding image. The specific analysis process includes:

[0063] When the electronic image is transmitted to the image analysis device, first of all, because when the original electronic image is directly analyzed, the color shadows of the foreign matter and the fiber in the electronic image are basically the same, it is difficult to visually judge that there is a clear boundary, so it is necessary to perform color inversion processing on the electronic image through the image analysis device during processing to highlight the color, such as Figure 4 shown.

[0064] After the electronic image is inverted, it is also necessary to perform binarization on the image to facilitate subsequent processing of the image by the image analysis device, such as Figure 2 shown.

[0065] After completing the binarization operation, the image analysis device captures the binarized image. The capture method can identify the specified color area through morphological processing: corrosion, expansion, hole filling, connected area extraction, etc. This process has become a relatively mature technology under the existing technology, and the image recognition difficulty is relatively low in the embodiment of the present application, and the capture process can be directly performed through the existing technology, and no technical description is given here.

[0066] When a color is specifically identified, it is necessary to capture the outline of the color so that colors in different ranges can be distinguished and marked in the image.

[0067] In the present application, the distinction is mainly between the first image information mark and the second image information mark, wherein the distinction between the first image information mark and the second image information mark is mainly made through a comprehensive judgment based on the comparison result with the comparison image.

[0068] In the above, the comparison image is a qualified standard spacer paper image. When the comparison image is inconsistent with the detected binary image, it is marked as a first image information mark. When the comparison image is consistent with the detected binary image, it is marked as a second image information mark.

[0069] The boundary between the first image information mark and the second image information mark is distinguished by a contour line. At the same time, in the present application, when the first image information mark is detected, the position of the spacer paper where the first image information mark is located is marked by a tangent mark. The cutting position is perpendicular to the moving direction of the spacer paper, and the marking line marked by the cutting mark is tangent to the edge of the first image information mark, such as Figure 4 As shown, the arrow direction is the moving direction of the spacer paper.

[0070] Through the tangent line mark, the cutting device 700 can cut the spacing paper along the mark line on the first image information mark, so that the part of the spacing paper that does not meet the requirements is removed, thereby ensuring the quality of the spacing paper.

[0071] In the embodiment of the present application, the cutting device 700 is electrically connected to the image analysis device, and the cutting device 700 cuts the paper according to the cutting line mark.

[0072] At the same time, for the second image information mark, although there is not much difference compared with the comparison image, in order to ensure the reliability of its quality, a preset transmittance is also set in the image analysis device. When the transmittance of the second image information mark is detected to be less than or greater than the preset transmittance, the image analysis device marks the part of the second image information mark that does not meet the transmittance as the first image information mark. At the same time, the first image information mark is cut off through the above-mentioned cutting process of the cutting device 700.

[0073] Through the above method, the unqualified parts on the spacer paper can be completely cut off to ensure the overall quality of the product.

[0074] In the above, the preset light transmittance range in the embodiment of the present application is: 48% to 65%.

[0075] In the embodiment of the present application, since the spacer paper needs to be laid on the glass 800, a complete spacer paper is required. In the present application, when it is detected that the range enclosed by the contour line in the second image information mark is greater than or equal to the irradiated area, the image analysis device generates ID information for the area enclosed by the contour line in the second image information mark; wherein, an ID is set on the glass 800, and the ID information on the spacer paper is the same as the ID information of the glass 800.

[0076] When the ID information is the same, the spacer paper is cut by the cutting device 700 to facilitate the corresponding matching of the spacer paper and the glass 800 to form a material and complete the paper processing.

[0077] In the embodiment of the present application, a driving roller 200 and an ironing wheel 300 are also provided. Figure 3 As shown, both are arranged in the black chamber interlayer 110, the driving roller 200 and the ironing wheel 300 are respectively arranged on both sides of the paper, and the ironing wheel 300 clamps and irons the paper, and the driving roller 200 drives the paper to move.

[0078] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A paper uniformity online detection method, characterized in that: include: Step 1: Paper Exposure The paper is moved to the irradiation area by the driving roller, and the detection light source irradiates the paper, and the light source passing through the paper is irradiated onto the receiver to form a detection image; Step 2: Image acquisition The image acquisition device detects the image on the receiver and generates an electronic image from the detected image; Step 3: Image Processing The image analyzing device processes the electronic image, wherein a comparison image is preset in the image analyzing device, and the image analyzing device performs image comparison based on the comparison image and the electronic image to generate an image mark, wherein the image mark includes a first image information mark at a position where the electronic image is different from the comparison image and a second image information mark at a position where the electronic image is the same as the comparison image; Step 4: Paper cutting Cut and remove the paper according to the first image information mark of the image mark, and cut and retain the paper according to the second image information mark of the image mark; Step 5: Paper Laying The paper marked with the second image information is laid on glass to form a material, thereby completing the processing of the paper.

2. The method for online detection of paper uniformity according to claim 1, characterized in that: In step 1: The irradiation area is a rectangular area, and the size of the irradiation area is the same as the size of the glass. The light path direction of the detection light source and the moving direction of the paper are arranged perpendicular to each other.

3. A paper uniformity online detection method according to claim 2, characterized in that: In the step 1; A receiving surface is arranged on the receiver at a side facing the paper, and the area of ​​the receiving surface is the same as the area of ​​the irradiation area.

4. The method for online detection of paper uniformity according to claim 1, characterized in that: In step 3, the image analysis device processes the electronic image including: Step 301: The image analysis device performs color inversion processing on the electronic image and the comparison image, and performs binarization processing on the color inversion processed image; Step 302: The image analysis device captures the color contour of the image after binary processing, and highlights the captured and recognized contour with a contour line; Step 303: The image analysis device compares the color of the image enclosed by the contour line with the comparison image. When the comparison images are inconsistent, they are marked as the first image information mark; when the comparison images are consistent, they are marked as the second image information mark. Both the first image information mark and the second image information mark include the contour line.

5. The method for online detection of paper uniformity according to claim 4, characterized in that: In step 3, the image analysis device is also preset with a preset transmittance. The image analysis device detects the transmittance in the second image information mark of the paper. When the transmittance of the paper is less than or greater than the preset transmittance, the image analysis device marks the range of the second image information mark that does not meet the preset transmittance as the first image information mark.

6. The method for online detection of paper uniformity according to claim 5, characterized in that: The preset light transmittance is 48% to 65%.

7. The method for online detection of paper uniformity according to claim 4, characterized in that: In step 3, the image analysis device is further provided with a tangent mark. When the image analysis device marks the first image information, the image analysis device performs a tangent mark in a direction perpendicular to the paper moving direction, and the tangent mark is tangent to the contour line of the first image information.

8. The method for online detection of paper uniformity according to claim 7, characterized in that: In step 4: The cutting device is electrically connected to the image analyzing device, and the cutting device cuts the paper according to the cutting mark.

9. The method for online detection of paper uniformity according to claim 4, characterized in that: In the step 4, when the range enclosed by the contour line in the second image information mark is greater than or equal to the irradiated area, the image analysis device generates ID information for the area enclosed by the contour line in the second image information mark; The ID information is the same as the ID information of the glass.

10. A detection device, implemented by an online detection method for paper uniformity according to any one of claims 1 to 9, characterized in that: The detection device comprises: A detection box, wherein a detection chamber and a black chamber interlayer are provided in the detection box, a reel is provided in the detection chamber, the reel stores paper, the paper includes spacer paper, the black chamber interlayer is provided with a first opening and a second opening, the paper enters the black chamber interlayer through the first opening, and the paper leaves the black chamber interlayer through the second opening; A driving roller and an ironing wheel are both arranged in the interlayer of the black chamber, the driving roller and the ironing wheel are respectively arranged at two sides of the paper, and the ironing wheel clamps and irons the paper, and the driving roller drives the paper to move; A detection light source is arranged in the interlayer of the black chamber, and the detection light source irradiates the paper; A receiver, arranged at a side of the paper relative to the detection light source; An image acquisition device, disposed in the black chamber interlayer, the image acquisition device acquires the image on the receiver; An image analysis device receives the electronic image of the image acquisition device, and the image analysis device analyzes and processes the electronic image; A cutting device is used to cut the paper.

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