Method, device, electronic equipment and system for detecting a relief of a printing plate surface

Abstract

The application relates to a printing plate surface bump detection method, device, electronic equipment and system, and belongs to the field of printing machine detection. The method comprises the following steps: acquiring multiple image information comprising reflected light rays, wherein the image information comprises the profile of a first bump along the axial direction of a bearing cylinder and the height of the profile; sequentially arranging multiple image information according to the circumference of the bearing cylinder to generate a first measurement graph; comparing the first measurement graph with a preset standard graph to determine an inconsistent area to be reviewed; acquiring scanning image information of the area to be reviewed; combining the scanning image information with the first measurement graph to generate a second measurement graph; determining at least one reference bump according to the area to be reviewed in the second measurement graph; and determining the height of a second bump in the area to be reviewed based on the height of the reference bump. The application has the effect of improving detection accuracy.

Description

Technical Field

[0001] This application relates to the field of printing press inspection, and in particular to a method, apparatus, electronic device and system for detecting raised areas on the surface of printing plates. Background Technology

[0002] Offset printing is a type of planographic printing press. The image and text design are laser-etched and transferred to multiple aluminum sheets, which become the printing plate. The printing plate is mounted on an impression roller, which presses against a rubber roller, which in turn presses against an impression roller. During printing, the impression roller rotates the printing plate, and ink adheres to the image area of ​​the plate. Under the relative pressure of the impression roller and the rubber roller, the image is transferred from the printing plate to the rubber roller. The paper moves between the rubber roller and the impression roller, and the image is then transferred from the rubber roller to the paper.

[0003] To improve printing quality, it is first necessary to improve the accuracy of the images on the printing plate. Therefore, it is necessary to inspect the raised parts on the printing plate. The raised parts can be the flexible printing dots of the flexographic printing plate (in the case of a halftone screen) or the flexible printing surface (in the case of a full-page printing). By inspecting the printing plate, the corresponding working pressure between the impression roller and the rubber roller participating in the printing process can be adjusted.

[0004] A Chinese patent with publication number CN114379221A discloses a device for measuring the raised portion of the surface of a rotating roller. The device uses a rotating body with a pressure plate to simulate an impression roller. The device has a first motor and a measuring device. The first motor is used to rotate the rotating body around the rotation axis. The measuring device includes at least one radiation source and at least one face camera. An axially parallel tensioned metal wire is used as a reference object. The face camera receives the light reflected after the radiation source illuminates the printing plate and the reference object. The information of the raised portion to be measured is determined by the reflected light.

[0005] However, if there is a lower second ridge between two adjacent first ridges on the circumference of the rotating body, the radiation source will have difficulty illuminating the second ridge due to the obstruction of the first ridges on both sides when using the above-mentioned equipment. This will result in inaccurate reflected light and affect the accuracy of the detection results. Therefore, if the working pressure between the impression roller and the rubber roller is adjusted according to the detection results, it may lead to lower printed image quality. Summary of the Invention

[0006] To improve detection accuracy, this application provides a method, apparatus, electronic device, and system for detecting raised areas on the surface of printing plates.

[0007] In a first aspect, this application provides a method for detecting raised portions on the surface of a printing plate, employing the following technical solution:

[0008] Acquire multiple image information including reflected light rays, the image information including the contour of the first raised portion along the axial direction of the bearing roller and the height of the contour;

[0009] The multiple image information items are arranged sequentially along the circumference of the bearing roller and combined to generate the first measurement image;

[0010] The first measurement image is compared with the preset standard image to identify the inconsistent areas that need to be reviewed.

[0011] Obtain the scanned image information of the area to be reviewed;

[0012] The scanned image information is combined with the first measurement map to generate a second measurement map;

[0013] Based on the area to be verified in the second measurement map, at least one reference ridge is determined;

[0014] Based on the height of the reference ridge, the height of the second ridge in the region to be reviewed is determined.

[0015] By adopting the above technical solution, the electronic device acquires image information including reflected light, and obtains a first measurement image based on the combination of image information. After comparing the first measurement image with a preset standard image, the area to be verified is determined, and then the scanned image information of the area to be verified is acquired. After combining the scanned image information with the first measurement image, a more complete second measurement image is generated. Then, the electronic device determines the height of the second raised part in the area to be verified based on the actual height of the reference raised part in the second measurement image. Therefore, by applying dual detection, a more complete detection result of the raised parts on the printing plate surface is obtained, improving detection accuracy and thus helping to improve the quality of printed products.

[0016] Further, the step of comparing the first measurement image with a preset standard image to determine the inconsistent areas to be reviewed includes:

[0017] Place the first measurement map and the preset standard map in the same coordinate system;

[0018] Compare the contours in the first measurement image with the contours at the corresponding positions in the standard image one by one to identify the contours that do not match.

[0019] Candidate verification regions are determined based on the inconsistent contours, wherein the candidate verification regions include the inconsistent contours and a region within a preset range surrounding the inconsistent contours;

[0020] Determine whether each of the candidate verification regions overlaps with other candidate verification regions;

[0021] If so, combine the overlapping candidate regions into a region to be reviewed;

[0022] Otherwise, the candidate review area will be determined as the area to be reviewed.

[0023] By adopting the above technical solution, the electronic device determines inconsistent contours by comparing the coordinates of the first measurement and the standard image in the same coordinate system, and determines candidate verification areas based on the inconsistent contours. The candidate verification areas are irregular. Based on the characteristics of the scanned image acquisition, the candidate verification areas are processed to determine the areas to be verified, thereby reducing the number of times the electronic device acquires scanned images of the areas to be verified and improving efficiency.

[0024] Further, the step of combining the scanned image information with the first measurement map to generate a second measurement map includes:

[0025] Obtain the first distance between at least two reference points on the edge of the scanned image;

[0026] On the first measurement map, obtain the coordinates of a reference point in the area to be verified that is at the same position as the benchmark point;

[0027] Determine a second distance between at least two of the reference points based on the coordinates of the reference points;

[0028] Determine the scale based on the first distance and the second distance;

[0029] The scanned image is scaled according to the scale bar;

[0030] The scanned image information is combined with the corresponding position in the first measurement map to generate a second measurement map, wherein the reference point in the second measurement map overlaps with the reference point.

[0031] By adopting the above technical solution, the electronic device calculates the size difference between the scanned image and the same area to be verified in the first measurement image, and calculates the scaling ratio between the two. This enables the scanned image to be accurately scaled and precisely combined with the corresponding position in the first measurement image to generate a complete second measurement image, thus obtaining more accurate image information for plate pressing.

[0032] Further, determining at least one reference ridge based on the area to be verified in the second measurement map includes:

[0033] Determine whether a first raised portion exists in the area to be reviewed;

[0034] If so, then any of the first raised portions is determined as the reference raised portion;

[0035] Otherwise, at least one first raised portion closest to the edge of the area to be verified is identified as a reference raised portion.

[0036] By adopting the above technical solution, the reference ridge can be quickly determined, and the first ridge closest to the area to be verified is selected as the reference ridge, which facilitates calculation.

[0037] Further, determining the height of the second raised portion in the region to be reviewed based on the height of the reference raised portion includes:

[0038] Obtain the first length in the coordinate system between the reference protrusion and the axis of the bearing roller;

[0039] Obtain the second length in the coordinate system between the second raised portion and the axis of the bearing roller;

[0040] The ratio of the height of the reference bulge to the first length is determined as the first ratio;

[0041] Based on the second length and the first ratio, the actual distance between the second raised portion and the printing roller axis is determined, and the actual distance is the height of the second raised portion.

[0042] By adopting the above technical solution, the electronic device calculates the ratio of the height of the reference bulge to the first length in the coordinate system, obtains the ratio of the image information to the actual height, and thus calculates the height of the second bulge, simplifying the calculation process and obtaining a more accurate height of the second bulge.

[0043] Furthermore, before arranging the multiple image information items sequentially along the circumference of the carrying roller and combining them to generate the first measurement image, the method further includes: processing the image information:

[0044] The image information is subjected to Gaussian blurring to generate the first process image information;

[0045] The first process image information is binarized to generate the second process image information;

[0046] The center of each column of the image information in the second process is extracted to generate the processed image information.

[0047] By adopting the above technical solution, the electronic device processes the acquired image information, reduces interference in the measurement process, obtains clearer image information, and facilitates obtaining a more accurate first measurement image.

[0048] In another possible implementation, the method further includes:

[0049] Acquire multiple image information for the same location;

[0050] The image information is processed;

[0051] Overlay multiple processed image information;

[0052] Identify at least two images with the highest degree of overlap as comparison images;

[0053] In a Cartesian coordinate system, the coordinates of the contour in the comparison image information are determined, and the optimized coordinates are obtained based on the average of at least two coordinates at the same position on the contour.

[0054] The optimized image information is obtained based on the optimized coordinates of each position on the contour.

[0055] By adopting the above technical solution, the electronic device obtains optimized image information by acquiring the same image information multiple times and performing image processing steps and calculating the average coordinates in sequence, thereby improving the accuracy of the detection results.

[0056] Secondly, this application provides a device for detecting raised areas on the surface of a printing plate, which adopts the following technical solution:

[0057] The first acquisition module is used to acquire multiple image information including reflected light rays, the image information including the contour of the first raised portion along the axial direction of the bearing roller and the height of the contour;

[0058] The first combination module is used to arrange multiple image information in sequence according to the circumference of the carrying roller, and combine them to generate a first measurement image;

[0059] The comparison module is used to compare the first measurement image with a preset standard image to identify areas that are inconsistent and need to be reviewed.

[0060] The second acquisition module is used to acquire scanned image information of the region to be reviewed;

[0061] The second combination module is used to combine the scanned image information with the first measurement map to generate a second measurement map;

[0062] A reference ridge determination module is used to determine at least one reference ridge based on the area to be verified in the second measurement map;

[0063] The second bulge determination module is used to determine the height of the second bulge in the region to be reviewed based on the height of the reference bulge.

[0064] By adopting the above technical solution, the first acquisition module acquires image information including reflected light, the first combination module combines the image information to obtain a first measurement image, the comparison module compares the first measurement image with a preset standard image to determine the area to be verified, and then the second acquisition module acquires the scanned image information of the area to be verified. The second combination module combines the scanned image information onto the first measurement image to generate a more complete second measurement image. Then, the reference ridge determination module and the second ridge determination module determine the height of the second ridge in the area to be verified based on the actual height of the reference ridge in the second measurement image. Therefore, by applying dual detection, a more complete detection result of the ridges on the printing plate surface is obtained, improving the detection accuracy.

[0065] Thirdly, this application provides an electronic device that adopts the following technical solution:

[0066] An electronic device, comprising:

[0067] At least one processor;

[0068] Memory;

[0069] At least one application, wherein the at least one application is stored in the memory and configured to be executed by the at least one processor, the at least one application being configured to: perform the method as described in any one of the first aspects.

[0070] By adopting the above technical solution, the processor executes the application program in the memory to acquire image information including reflected light. Based on the combination of image information, a first measurement image is obtained. After comparing the first measurement image with a preset standard image, the area to be verified is determined. Then, the scanned image information of the area to be verified is acquired. After combining the scanned image information with the first measurement image, a more complete second measurement image is generated. Then, the electronic device determines the height of the second ridge in the area to be verified based on the actual height of the reference ridge in the second measurement image. Therefore, by applying dual detection, a more complete detection result of the ridge on the printing plate surface is obtained, improving the detection accuracy.

[0071] Fourthly, this application provides a printing press plate surface protrusion detection system, which adopts the following technical solution:

[0072] A printing press plate surface protrusion detection system includes:

[0073] Electronic devices as described in the third aspect above;

[0074] A light detection device is used to detect the surface of a printing plate-bearing cylinder to obtain image information with reflected light.

[0075] A laser triangulation sensor is used to scan the area to be verified on the carrier roller carrying the printing plate to obtain a scanned image of the area to be verified.

[0076] Both the light detection device and the laser triangulation sensor are connected to the electronic device.

[0077] By adopting the above technical solution, the electronic device acquires image information including reflected light through a light detection device, and obtains a first measurement image based on the combination of image information. After comparing the first measurement image with a preset standard image, the area to be verified is determined. Then, the scanning image information of the area to be verified is acquired by a laser triangulation sensor. After combining the scanning image information with the first measurement image, a more complete second measurement image is generated. Then, the electronic device determines the height of the second ridge in the area to be verified based on the actual height of the reference ridge in the second measurement image. Therefore, by applying dual detection, a more complete detection result of the ridge on the printing plate surface is obtained, improving the detection accuracy.

[0078] In summary, this application includes at least one of the following beneficial technical effects:

[0079] 1. The electronic device acquires image information including reflected light, and obtains a first measurement image by combining the image information. After comparing the first measurement image with a preset standard image, the area to be verified is determined. Then, the scanned image information of the area to be verified is acquired. After combining the scanned image information with the first measurement image, a more complete second measurement image is generated. Then, the electronic device determines the height of the second raised part in the area to be verified based on the actual height of the reference raised part in the second measurement image. Therefore, by applying dual detection, a more complete detection result of the raised parts on the printing plate surface is obtained, improving detection accuracy and thus improving the quality of printed products.

[0080] 2. Based on the characteristics of the scanned images, the candidate verification areas are processed to determine the areas to be verified, thereby reducing the number of times the electronic device acquires the scanned images of the areas to be verified and improving efficiency;

[0081] 3. Electronic equipment processes the acquired image information to reduce interference during the measurement process, resulting in clearer image information and facilitating a more accurate first measurement image. Attached Figure Description

[0082] Figure 1 This is a front structural schematic diagram of the printing plate surface protrusion detection system in an embodiment of this application.

[0083] Figure 2 This is a side view of the printing plate surface protrusion detection system in an embodiment of this application.

[0084] Figure 3This is a structural block diagram of the printing plate surface protrusion detection system in an embodiment of this application.

[0085] Figure 4 This is a schematic diagram of the structure of image information in an embodiment of this application.

[0086] Figure 5 This is a flowchart of steps S101 to S107 of the method for detecting raised parts on the surface of a printing plate in an embodiment of this application.

[0087] Figure 6 This is a schematic diagram of the structure of the first raised portion and the second raised portion in the embodiments of this application.

[0088] Figure 7 This is a schematic diagram of the area to be reviewed in the embodiments of this application.

[0089] Figure 8 This is a structural block diagram of the printing plate surface protrusion detection device in the embodiments of this application.

[0090] Figure 9 This is a structural block diagram of the electronic device in the embodiments of this application.

[0091] Figure label:

[0092] 1. Detection chamber; 2. Rotating shaft; 3. Motor; 4. Bearing roller; 5. Sleeve; 6. Printing plate; 7. Light detection device; 71. Radiation source; 72. Light receiver; 8. Lower shielding part; 9. Reference object; 10. Upper shielding part; 11. Outline of upper shielding part; 12. Outline of printing plate surface; 13. Laser triangulation sensor; 14. Slider; 15. Slide rail; 16. Lead screw; 17. Controller; 18. Wireless communication module; 300. Electronic equipment. Detailed Implementation

[0093] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0094] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article, unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship.

[0095] This application discloses a system for detecting raised areas on the surface of a printing plate. (Refer to...) Figure 1 and Figure 2 The printing plate surface protrusion detection system includes a detection housing 1, inside which is a motor 3 connected to a rotating shaft 2, driving the rotating shaft 2 to rotate. A support roller 4 is fixed on the rotating shaft 2, and a sleeve 5 is fitted over the support roller 4, allowing the sleeve 5 to be pushed onto the support roller 4 from the side. The printing plate 6 is fixed to the arcuate side of the sleeve 5 with adhesive tape. The support roller 4 may have openings on its circumference, from which pressurized air can be ejected to expand the sleeve 5 and to generate an air cushion during pushing. The sleeve 5 with the printing plate 6 can be removed from the detection housing 1 after measurement and can be installed onto the impression cylinder of the printing mechanism in the printing press. Therefore, when the sleeve 5 is installed on the support roller 4, it can simulate the impression cylinder in the printing press.

[0096] To measure the raised portion of the printing plate surface without contact, the printing plate surface raised portion detection system includes a light detection device 7, which includes multiple radiation sources 71, which can be light sources or other electromagnetic radiation sources 71, preferably LED light sources, and such as infrared emitters; it also includes at least one light receiver 72, which can be a surface camera.

[0097] Radiation sources 71 are arranged in a row on one side of the carrier roller 4, and the arrangement direction of the radiation sources 71 is parallel to the axial direction of the carrier roller 4. The light receiver 72 is disposed on the other side of the carrier roller 4, and is parallel to the axial direction of the carrier roller 4. The light receiver 72 is disposed opposite to the radiation sources 71. The radiation sources 71 generate a light curtain above the carrier roller 4. After the light curtain illuminates the carrier roller 4 on which the printing plate 6 is fixed, a lower shielding part 8 is generated. The lower shielding part 8 is the contour generated on the surface of the printing plate 6 along the current generatrix. The light receiver 72 receives the light after the light curtain is reflected by the reflector. The reflected light does not include the lower shielding part 8. Therefore, the image information received by the light receiver 72 includes the contour of the raised part along the axial direction of the printing roller.

[0098] Reference Figure 3 The radiation source 71 and the light receiver 72 are both connected to a controller 17. The controller 17 is connected to a wireless communication module 18. The controller 17 communicates wirelessly with the electronic device 300 through the wireless communication module 18. The light receiver 72 sends the received image information to the electronic device 300, and the electronic device 300 receives the image information sent by the light receiver 72.

[0099] Reference Figure 1 , Figure 2 and Figure 4A reference object 9 is fixed on the detection box 1 located directly above the axis of the bearing roller 4. The reference object 9 can be a taut thin wire or a crossbeam. Therefore, when the light curtain passes through the reference object 9, an upper shielding part 10 is generated. Thus, the image information received by the light receiver 72 does not include the upper shielding part 10. The top edge is the outline 11 of the upper shielding part, and the bottom edge is the outline 12 of the printing plate surface.

[0100] After installing the printing plate 6, adjust the position of the reference object 9 so that the distance between the bottom edge of the reference object 9 and the axis of the carrier roller 4 is a preset distance. Therefore, after the electronic device 300 receives the image information sent by the light receiver 72, it can determine the radius between the contour and the axis based on the distance between the upper shielding part 10 and the axis of the carrier roller 4. This radius is the height of the contour.

[0101] During measurement, controller 17 controls motor 3 to rotate, causing carrier roller 4 to rotate printing plate 6, thereby enabling the detection of all raised portions along the circumferential direction. Electronic device 300 can obtain a topographic image and the height of each raised portion based on the angular position of carrier roller 4.

[0102] A laser triangulation sensor 13 is also installed inside the detection chamber 1. The laser triangulation sensor 13 can be mounted on a slider 14. A slide rail 15 extending along the axis of the carrying roller 4 is provided on the detection chamber 1. The slider 14 is slidably connected to the slide rail 15. A lead screw 16 is also provided on the slide rail 15. The lead screw 16 can drive the slider 14 to slide along the slide rail 15. The laser triangulation sensor 13 can scan the contour of the printing plate 6 surface. Both the laser triangulation sensor 13 and the lead screw 16 are connected to a controller 17. The controller 17 can control the movement of the lead screw 16 to adjust the position of the laser triangulation sensor 13, and can also send the scanned image scanned by the laser triangulation sensor 13 to the electronic device 300.

[0103] When the electronic device 300 needs to acquire a scanned image of a certain position on the surface of the printing plate 6, the controller 17 can control the motor 3 to rotate, rotating the position to be scanned to face the laser triangulation sensor 13. The lead screw 16 drives the laser triangulation sensor 13 to slide to the edge of the position to be scanned. The lead screw 16 and the carrying roller 4 work together to make the laser triangulation sensor 13 scan all the areas to be scanned. The laser triangulation sensor 13 sends the scanned image to the electronic device 300 in real time.

[0104] This application also provides a method for detecting raised areas on the surface of a printing plate, executed by an electronic device, as described above. Figure 5 ,include:

[0105] Step S101: Acquire multiple image information including reflected light rays. The image information includes the contour of the first raised portion along the axial direction of the bearing roller and the height of the contour.

[0106] Specifically, the electronic device is connected to the optical receiver to receive image information sent by the optical receiver.

[0107] The raised areas shown in the image information are all first raised areas, meaning that the first raised areas are not obscured by other raised areas. The raised areas on the printing plate also include second raised areas, which are sandwiched between two higher first raised areas. Light is easily blocked by the first raised areas, so it is difficult to obtain an accurate outline of the second raised areas in the image information acquired by the electronic image.

[0108] Reference Figure 6 A is the first raised part, and B is the second raised part.

[0109] Step S102: Arrange multiple image information in sequence according to the circumference of the carrying roller, and combine them to generate the first measurement image.

[0110] Specifically, each image is a cross-section of the carrier roller with the printing plate. The electronic device arranges the image information sequentially along the axis of the carrier roller according to the angular position of the motor and the image information corresponding to the angular position, and then splices and combines them to obtain the three-dimensional image as the first measurement image.

[0111] Step S103: Compare the first measurement image with the preset standard image to identify areas that are inconsistent and require verification. Specifically, this includes (steps S1031 to S1033):

[0112] Step S1031: Place the first measurement map and the preset standard map in the same coordinate system.

[0113] Specifically, after the electronic device generates the first measurement map, it places the first measurement map in a three-dimensional coordinate system, so that each point in the first measurement map has a unique corresponding coordinate.

[0114] The standard image is a drawing on a carrier cylinder with a standard printing plate, and the text and images on the standard printing plate are complete.

[0115] Step S1032: Compare the contours in the first measurement map with the contours at the corresponding positions in the standard map one by one to identify the inconsistent contours.

[0116] Specifically, since the standard drawing includes all the raised parts, the one that matches the comparison is the first raised part. Therefore, the electronic device can identify the second raised part by comparing the contours that do not match.

[0117] Step S1033: Determine candidate verification regions based on the inconsistent contours. The candidate verification regions include the inconsistent contours and the regions within a preset range surrounding the inconsistent contours.

[0118] Specifically, if part S in the figure is one of the inconsistent contours determined by the electronic device through comparison, then the first coordinate of the inconsistent contour is determined. Then, with each first coordinate as the center and a preset value as the radius, a circle is drawn along the surface of the printing plate to determine multiple preset ranges in the shape of arcs. The preset ranges are combined to obtain the candidate verification area M. The inconsistent contour is also located in the candidate verification area.

[0119] Furthermore, since the laser triangulation sensor can only scan rectangular areas, when it scans the printing plate surface, it actually scans an arc-shaped area. Therefore, the electronic device optimizes the candidate verification area M to generate a candidate verification area N that conforms to the rules of the detection path of the laser triangulation sensor.

[0120] Step S1034: Determine whether each candidate verification region overlaps with other candidate verification regions; if so, proceed to step S1035; otherwise, proceed to step S1036.

[0121] Specifically, after determining the candidate verification area, the electronic device can determine the coordinates of any point on the printing plate surface within the candidate verification area. When any candidate verification area has the same coordinate point as other candidate verification areas, it is determined that the current candidate verification area overlaps with other candidate verification areas.

[0122] Step S1035: Combine the candidate verification regions that overlap into a region to be verified.

[0123] Specifically, it can reduce the number of areas to be reviewed.

[0124] Step S104: Obtain scanned image information of the area to be reviewed.

[0125] Specifically, the electronic device generates a task to scan the area to be verified, and then the laser triangulation sensor processes the task in sequence, scanning the area to be verified corresponding to the bearing roller with the printing plate, and obtaining a scanned image of the area to be verified.

[0126] Step S105: Combine the scanned image information with the first measurement map to generate the second measurement map, including (steps S1051 to S1056):

[0127] Step S1051: Obtain the first distance between at least two reference points on the edge of the scanned image.

[0128] Specifically, since the size of the scanned image may not be consistent with the size of the first measured image, and multiple images need to be combined, it is necessary to unify the sizes of the two.

[0129] The electronic device selects at least two reference points at any position on the edge of the scanned image. After selecting two reference points, it determines the first distance between the two reference points in the scanned image based on the current coordinates of the reference points.

[0130] Step S1052: Obtain the coordinates of the reference point in the area to be verified, which is at the same position as the benchmark point, on the first measurement map.

[0131] Specifically, the electronic device determines the same reference point on the first measurement map. To facilitate the selection of the same reference point, the electronic device can select the corner point of the scanned image as the reference point.

[0132] Step S1053: Determine a second distance between at least two reference points based on the coordinates of the reference points.

[0133] Step S1054: Determine the scale based on the first distance and the second distance.

[0134] Specifically, the electronic device divides the first distance by the second distance to calculate the scale.

[0135] For example, if the first distance is 10cm and the second distance is 5cm, then the scale is 2:1.

[0136] Step S1055: Scale the scanned image according to the scale bar.

[0137] Specifically, when the scale is greater than one, the scanned image is reduced according to the scale; when the scale is less than one, the scanned image is enlarged according to the scale.

[0138] Step S1056: Combine the scanned image information at the corresponding positions in the first measurement map to generate a second measurement map, wherein the reference point in the second measurement map overlaps with the reference point.

[0139] Step S106: Based on the area to be verified in the second measurement map, determine at least one reference ridge, including: determining whether there is a first ridge in the area to be verified; if so, determine any first ridge as a reference ridge; otherwise, determine at least one first ridge closest to the edge of the area to be verified as a reference ridge.

[0140] Specifically, since the height of the first raised portion is known in the electronic device, the height of the second raised portion can be calculated by using the first raised portion as a reference raised portion and its height as a reference.

[0141] Step S107: Based on the height of the reference ridge, determine the height of the second ridge in the area to be reviewed, including (steps S1071 to S1074):

[0142] Step S1071: Obtain the first length in the coordinate system between the reference bulge and the axis of the bearing roller.

[0143] Step S1072: Obtain the second length in the coordinate system between the second raised portion and the axis of the bearing roller.

[0144] Step S1073: Determine the ratio of the height of the reference bulge to the first length as the first ratio.

[0145] Step S1074: Based on the second length and the first ratio, determine the actual distance between the second raised portion and the bearing roller axis. The actual distance is the height of the second raised portion.

[0146] Specifically, in the coordinate system, the distance between the reference ridge and the axis is not necessarily equal to the height of the reference ridge. Therefore, the electronic device obtains the first length between the reference ridge and the axis, and calculates the first ratio based on the first length and the actual height of the reference ridge.

[0147] For example: refer to Figure 6 If the height R1 of the reference ridge A is 14cm and the first length is 20cm, then the first ratio is 0.7. If the second length is 19.2cm, then the height R2 of the second ridge B is 13.44cm.

[0148] In another possible implementation, the image information received by the electronic device may not be clear enough. To improve accuracy, before arranging multiple image information sequentially along the circumference of the carrying roller and combining them to generate the first measurement image, the method further includes: processing the image information.

[0149] The image information is Gaussian blurred to generate the first process image information; the first process image information is binarized to generate the second process image information; the center of the second process image information is extracted column by column to generate the processed image information.

[0150] In another possible implementation, in order to obtain a more accurate contour and contour height of the first bulge based on the image information, the above method further includes (steps S21 to S26):

[0151] Step S21: Acquire multiple image information for the same location.

[0152] Specifically, the electronic device causes the carrier roller to rotate multiple times. Each time the carrier roller rotates once, the electronic device acquires image information once. Therefore, the electronic device can acquire multiple image information from various positions.

[0153] Step S22: Process the image information.

[0154] Specifically, the process by which an electronic device processes image information involves performing the steps described above for "processing image information".

[0155] Step S23: Overlay multiple processed image information;

[0156] Specifically, during the overlapping process, the outlines of the upper occluded parts of each image information are combined.

[0157] Step S24: Determine at least two image information with the highest degree of overlap as comparison image information.

[0158] Specifically, when the number of overlapping points in the contour of an image is large, the degree of overlap between the two images is high.

[0159] Step S25: Determine the coordinates of the contour in the comparison image information in the rectangular coordinate system, and obtain the optimized coordinates based on the average of at least two coordinates at the same position on the contour.

[0160] Specifically, the electronic device calculates the average of at least two coordinates corresponding to the same location. The more coordinates involved in the calculation, the more accurate the optimized coordinates will be.

[0161] Step S26: Obtain the optimized image information based on the optimized coordinates of each position on the contour.

[0162] Specifically, the electronic device connects the various optimized coordinates to obtain the optimized image information.

[0163] To better implement the above method, this application also provides a device for detecting raised areas on the surface of a printing plate, referring to... Figure 8 The printing plate surface protrusion detection device 200 includes:

[0164] The first acquisition module 201 is used to acquire multiple image information including reflected light rays. The image information includes the contour of the first raised portion along the axial direction of the bearing roller and the height of the contour.

[0165] The first combination module 202 is used to arrange multiple image information in sequence according to the circumference of the carrying roller and combine them to generate a first measurement image;

[0166] The comparison module 203 is used to compare the first measurement image with the preset standard image to identify the inconsistent areas to be reviewed.

[0167] The second acquisition module 204 is used to acquire scanned image information of the area to be reviewed;

[0168] The second combination module 205 is used to combine the scanned image information with the first measurement map to generate a second measurement map;

[0169] Reference ridge determination module 206 is used to determine at least one reference ridge based on the area to be verified in the second measurement map;

[0170] The second bulge determination module 207 is used to determine the height of the second bulge in the area to be reviewed based on the height of the reference bulge.

[0171] Furthermore, the comparison module 203 is specifically used for:

[0172] Place the first measurement map and the preset standard map in the same coordinate system;

[0173] Compare the contours in the first measurement map with the contours at the corresponding positions in the standard map one by one to identify the contours that do not match.

[0174] Candidate verification regions are determined based on the inconsistent contours. The candidate verification regions include the inconsistent contours and the regions within a preset range surrounding the inconsistent contours.

[0175] Determine whether each candidate review area overlaps with other candidate review areas;

[0176] If so, combine the overlapping candidate regions into a region to be reviewed;

[0177] Otherwise, the candidate review area will be designated as the area to be reviewed.

[0178] Furthermore, the second assembly module 205 is specifically used for:

[0179] Obtain the first distance between at least two reference points on the edge of the scanned image;

[0180] On the first measurement map, obtain the coordinates of a reference point in the area to be verified that is at the same location as the benchmark point;

[0181] Determine the second distance between at least two reference points based on the coordinates of the reference points;

[0182] Determine the scale based on the first and second distances;

[0183] Scaling the scanned image according to the scale bar;

[0184] The scanned image information is combined with the corresponding positions in the first measurement map to generate a second measurement map, in which the reference point overlaps with the benchmark point.

[0185] Furthermore, referring to the raised portion determination module 206, it is specifically used for:

[0186] Determine whether a first raised portion exists in the area to be reviewed;

[0187] If so, then any first raised portion is determined as the reference raised portion;

[0188] Otherwise, at least one first ridge closest to the edge of the area to be reviewed is identified as a reference ridge.

[0189] Furthermore, the second raised portion defining module 207 is specifically used for:

[0190] Obtain the first length in the coordinate system between the reference bulge and the axis of the bearing roller;

[0191] Obtain the second length in the coordinate system between the second raised portion and the axis of the bearing roller;

[0192] The ratio of the height of the reference bulge to the first length is determined as the first proportion;

[0193] Based on the second length and the first ratio, the actual distance between the second raised portion and the axis of the bearing roller is determined, and the actual distance is the height of the second raised portion.

[0194] In another possible implementation, the printing plate surface protrusion detection device 200 further includes an image information processing module, specifically used for:

[0195] The image information is subjected to Gaussian blurring to generate the first process image information;

[0196] The image information of the first process is binarized to generate the image information of the second process.

[0197] The center of each column of the image information in the second process is extracted to generate the processed image information.

[0198] In another possible implementation, the printing plate surface protrusion detection device 200 further includes:

[0199] The third acquisition module is used to acquire multiple image information for the same location;

[0200] The image information processing module is used to process image information;

[0201] The overlap processing module is used to overlap multiple processed image information.

[0202] The image information determination module is used to determine at least two images with the highest degree of overlap as comparison image information;

[0203] The optimized coordinate determination module is used to determine the coordinates of the contour in the comparison image information in a rectangular coordinate system. The optimized coordinates are obtained based on the average of at least two coordinates at the same position on the contour.

[0204] The optimized image information determination module is used to obtain optimized image information based on the optimized coordinates of each position on the contour.

[0205] The various variations and specific examples of the methods in the foregoing embodiments are also applicable to the printing press plate surface protrusion detection device of this embodiment. Through the foregoing detailed description of the printing press plate surface protrusion detection method, those skilled in the art can clearly understand the implementation method of the printing press plate surface protrusion detection device of this embodiment. Therefore, for the sake of brevity, it will not be described in detail here.

[0206] To better implement the above methods, embodiments of this application provide an electronic device, referring to... Figure 9 The electronic device 300 includes a processor 301, a memory 303, and a display screen 305. The memory 303 and the display screen 305 are both connected to the processor 301, such as via a bus 302. Optionally, the electronic device 300 may also include a transceiver 304. It should be noted that in practical applications, the transceiver 304 is not limited to one type, and the structure of this electronic device 300 does not constitute a limitation on the embodiments of this application.

[0207] Processor 301 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. Processor 301 may also be a combination that implements computational functions, such as including one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.

[0208] Bus 302 may include a pathway for transmitting information between the aforementioned components. Bus 302 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. Bus 302 may be divided into address bus, data bus, control bus, etc.

[0209] The memory 303 may be a ROM (Read Only Memory) or other type of static storage device capable of storing static information and instructions, RAM (Random Access Memory) or other type of dynamic storage device capable of storing information and instructions, or an EEPROM (Electrically Erasable Programmable Read Only Memory), CD-ROM (Compact Disc Read Only Memory) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited thereto.

[0210] The memory 303 is used to store application code that executes the solution of this application, and its execution is controlled by the processor 301. The processor 301 is used to execute the application code stored in the memory 303 to implement the content shown in the foregoing method embodiments.

[0211] Figure 9 The electronic device 300 shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0212] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

[0213] Additionally, it should be understood that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

Claims

1. A method for detecting raised areas on the surface of a printing plate, characterized in that, include: Acquire multiple image information including reflected light rays, the image information including the contour of the first raised portion along the axial direction of the bearing roller and the height of the contour; The multiple image information items are arranged sequentially along the circumference of the bearing roller and combined to generate the first measurement image; The first measurement image is compared with the preset standard image to identify the inconsistent areas that need to be reviewed. Obtain the scanned image information of the area to be reviewed; The scanned image information is combined with the first measurement map to generate a second measurement map; Based on the area to be verified in the second measurement map, at least one reference ridge is determined; Based on the height of the reference ridge, the height of the second ridge in the region to be reviewed is determined.

2. The method according to claim 1, characterized in that, The step of comparing the first measurement image with a preset standard image to determine the inconsistent areas to be reviewed includes: Place the first measurement map and the preset standard map in the same coordinate system; Compare the contours in the first measurement image with the contours at the corresponding positions in the standard image one by one to identify the contours that do not match. Candidate verification regions are determined based on the inconsistent contours, the candidate verification regions including the inconsistent contours and a region within a predetermined range surrounding the inconsistent contours; Determine whether each of the candidate verification regions overlaps with other candidate verification regions; If so, combine the overlapping candidate regions into a region to be reviewed; Otherwise, the candidate review area will be determined as the area to be reviewed.

3. The method according to claim 1, characterized in that, The step of combining the scanned image information with the first measurement map to generate a second measurement map includes: Obtain the first distance between at least two reference points on the edge of the scanned image; On the first measurement map, obtain the coordinates of a reference point in the region to be verified that is at the same position as the benchmark point; Determine a second distance between at least two of the reference points based on the coordinates of the reference points; Determine the scale based on the first distance and the second distance; The scanned image is scaled according to the scale bar; The scanned image information is combined with the corresponding position in the first measurement map to generate a second measurement map, wherein the reference point in the second measurement map overlaps with the reference point.

4. The method according to claim 1, characterized in that, The step of determining at least one reference ridge based on the area to be verified in the second measurement map includes: Determine whether a first raised portion exists in the area to be reviewed; If so, then any of the first raised portions is determined as the reference raised portion; Otherwise, at least one first raised portion closest to the edge of the area to be verified is identified as a reference raised portion.

5. The method according to claim 1, characterized in that, Determining the height of the second ridge in the region to be reviewed based on the height of the reference ridge includes: Obtain the first length in the coordinate system between the reference protrusion and the axis of the bearing roller; Obtain the second length in the coordinate system between the second raised portion and the axis of the bearing roller; The ratio of the height of the reference bulge to the first length is determined as the first ratio; Based on the second length and the first ratio, the actual distance between the second raised portion and the axis of the bearing roller is determined, and the actual distance is the height of the second raised portion.

6. The method according to claim 1, characterized in that, Before arranging multiple image information items sequentially along the circumference of the carrying roller to generate a first measurement image, the method further includes: processing the image information: The image information is subjected to Gaussian blurring to generate the first process image information; The first process image information is binarized to generate the second process image information; The center of each column of the image information in the second process is extracted to generate the processed image information.

7. The method according to claim 1, characterized in that, The method further includes: Acquire multiple image information for the same location; The image information is processed; Overlay multiple processed image information; Identify at least two images with the highest degree of overlap as comparison image information; In a Cartesian coordinate system, the coordinates of the contour in the comparison image information are determined, and the optimized coordinates are obtained based on the average of at least two coordinates at the same position on the contour. The optimized image information is obtained based on the optimized coordinates of each position on the contour.

8. A device for detecting raised areas on the surface of a printing plate, characterized in that, include: The first acquisition module is used to acquire multiple image information including reflected light rays, the image information including the contour of the first raised portion along the axial direction of the bearing roller and the height of the contour; The first combination module is used to arrange multiple image information in sequence according to the circumference of the carrying roller, and combine them to generate a first measurement image; The comparison module is used to compare the first measurement image with a preset standard image to identify areas that are inconsistent and need to be reviewed. The second acquisition module is used to acquire scanned image information of the region to be reviewed; The second combination module is used to combine the scanned image information with the first measurement map to generate a second measurement map; A reference ridge determination module is used to determine at least one reference ridge based on the area to be verified in the second measurement map; The second bulge determination module is used to determine the height of the second bulge in the region to be reviewed based on the height of the reference bulge.

9. An electronic device, characterized in that, include: At least one processor; Memory; At least one application, wherein the at least one application is stored in the memory and configured to be executed by the at least one processor, the at least one application being configured to: perform the method according to any one of claims 1 to 7.

10. A system for detecting raised areas on the surface of a printing plate, characterized in that, include: The electronic device as described in claim 9 above; A light detection device is used to detect the surface of a printing plate-bearing roller to obtain image information with reflected light. A laser triangulation sensor is used to scan the area to be verified on the carrier roller carrying the printing plate to obtain a scanned image of the area to be verified. Both the light detection device and the laser triangulation sensor are connected to the electronic device.

Images