CN115979144A

CN115979144A - Method, device, electronic equipment and system for detecting raised part on surface of printing plate of printing machine

Info

Publication number: CN115979144A
Application number: CN202211636738.8A
Authority: CN
Inventors: 李慧; 李莹; 刘爽; 孟祥桐
Original assignee: Tianjin Yiyao Printing Co ltd
Current assignee: Tianjin Yiyao Printing Co ltd
Priority date: 2022-12-16
Filing date: 2022-12-16
Publication date: 2023-04-18

Abstract

The application relates to a method, a device, electronic equipment and a system for detecting raised parts on the surface of a printing plate of a printing machine, belonging to the field of detection of printing machines, wherein the method comprises the following steps: acquiring a plurality of image information including reflected light rays, wherein the image information includes the outline of the first bump along the axial direction of the bearing roller and the height of the outline; sequentially arranging a plurality of image information according to the circumferential direction of the bearing roller, and combining to generate a first measurement diagram; comparing the first measurement image with a preset standard image, and determining an inconsistent region to be subjected to review; acquiring the scanned image information of the region to be rechecked; combining the scanned image information with the first measurement map to generate a second measurement map; determining at least one reference elevation from the region to be re-examined in the second measurement map; determining a height of a second bump in the region to be nucleated based on the height of the reference bump. The method and the device have the effect of improving the detection precision.

Description

Method, device, electronic equipment and system for detecting raised part on surface of printing plate of printing machine

Technical Field

The present application relates to the field of printing press detection, and in particular, to a method, an apparatus, an electronic device and a system for detecting raised portions on a printing plate surface of a printing press.

Background

The offset press is one kind of lithographic printing machine, and the image and text are laser etched and transferred to several aluminum sheets, which are the printing plate. The printing plate is arranged on an impression roller, a rubber roller is pressed on the impression roller pair, and an impression roller is pressed on the rubber roller pair. During printing, the impression cylinder drives the printing plate to rotate, the ink is adhered to the image area of the printing plate, the image is transferred to the blanket cylinder from the printing plate under the relative extrusion of the impression cylinder and the blanket cylinder, the paper moves between the blanket cylinder and the impression cylinder, and the image is transferred to the paper by the blanket cylinder.

In order to improve the printing quality, firstly the accuracy of the image and text on the printing plate needs to be improved, so that the raised parts on the printing plate, which can be flexographic printing points (in the case of a grid) or flexographic printing surfaces (in the case of a full plate), need to be detected, and the corresponding working pressure between the impression cylinder and the rubber cylinder participating in the printing process can be adjusted through the detection of the printing plate.

Chinese patent No. CN114379221a discloses an apparatus for measuring the raised portions of a surface of a rotating cylinder, which uses a rotating body with a platen to simulate an impression cylinder, and the apparatus has a first motor for rotating the rotating body around a rotating shaft and a measuring device, the measuring device includes at least one radiation source and at least one surface camera, and uses axially parallel tensioned metal wires as a reference object, the surface camera receives light reflected by the radiation source after irradiating the printing plate and the reference object, and determines the information of the raised portions to be measured by the reflected light.

However, if a second raised part with a lower height is arranged between two adjacent first raised parts on the circumferential surface of the rotating body, by adopting the above-mentioned apparatus, under the shielding of the first raised parts on both sides, the radiation source is difficult to irradiate the second raised part, which may cause the obtained reflected light to be inaccurate and affect the accuracy of the detection result, and therefore, if the corresponding working pressure between the impression cylinder and the blanket cylinder is adjusted according to the detection result, the quality of the printed image may be lower.

Disclosure of Invention

In order to improve detection accuracy, the application provides a method, a device, an electronic device and a system for detecting the raised part on the surface of the printing plate of the printing machine.

In a first aspect, the present application provides a method for detecting a raised portion on a printing plate surface of a printing press, which adopts the following technical solution:

acquiring a plurality of image information including reflected light, wherein the image information includes the contour of the first bulge along the axial direction of the bearing roller and the height of the contour;

sequentially arranging a plurality of pieces of image information according to the circumferential direction of a bearing roller, and combining to generate a first measurement diagram;

comparing the first measurement diagram with a preset standard diagram, and determining inconsistent regions to be subjected to review;

acquiring the scanned image information of the region to be rechecked;

combining the scanned image information with the first measurement map to generate a second measurement map;

determining at least one reference elevation from the region to be re-examined in the second measurement map;

determining a height of a second bump in the region to be nucleated based on the height of the reference bump.

By adopting the technical scheme, the electronic equipment acquires the image information comprising the reflected light, the first measurement graph is obtained according to the image information combination, the first measurement graph is compared with the preset standard graph, the region to be rechecked is determined, the scanned image information of the region to be rechecked is further acquired, the scanned image information is combined on the first measurement graph, the more complete second measurement graph is generated, the electronic equipment determines the height of the second bulge in the region to be rechecked according to the actual height of the reference bulge in the second measurement graph, therefore, double detection is applied, the more complete detection result of the bulge on the surface of the printing plate is obtained, the detection precision is improved, and the quality of printed products is favorably improved.

Further, the comparing the first measurement map with a preset standard map to determine an inconsistent region to be re-examined includes:

placing the first measurement diagram and a preset standard diagram in the same coordinate system;

comparing the contours in the first measurement image with the contours at corresponding positions in the standard image one by one to determine inconsistent contours;

determining candidate review areas according to the inconsistent contours, wherein the candidate coincidence areas comprise the inconsistent contours and areas located in a preset range around the inconsistent contours;

judging whether each candidate review area is overlapped with other candidate review areas;

if so, combining all the overlapped candidate rechecking areas into a to-be-rechecked area;

otherwise, determining the candidate review region as a region to be reviewed.

By adopting the technical scheme, the electronic equipment compares the coordinates to determine the inconsistent outline by placing the first measurement and the standard graph in the same coordinate system, determines the candidate review area according to the inconsistent outline, wherein the candidate review area is irregular, processes the candidate review area according to the characteristics of the scanned image, determines the area to be reviewed, reduces the frequency of acquiring the scanned image of the area to be reviewed by the electronic equipment, and improves the efficiency.

Further, the combining the scanned image information with the first measurement map to generate a second measurement map includes:

acquiring a first distance between at least two reference points on the edge of the scanned image;

acquiring coordinates of a reference point which is in the same position with the reference point in the region to be checked on the first measurement diagram;

determining a second distance between at least two of the reference points based on the coordinates of the reference points;

determining a scale based on the first distance and the second distance;

scaling the scanned image according to the scale;

and combining the scanned image information in the corresponding position in the first measurement diagram to generate a second measurement diagram, wherein the reference point in the second measurement diagram is overlapped with the reference point.

By adopting the technical scheme, the electronic equipment calculates to obtain the size difference between the scanned image and the same to-be-rechecked area in the first measurement image, calculates to obtain the scaling scale for scaling between the scanned image and the first measurement image, further can accurately scale the scanned image, enables the scanned image to be accurately combined at the corresponding position in the first measurement image, generates the finished second measurement image, and therefore obtains more accurate image information of the pressed version.

Further, the determining at least one reference bump from the region to be re-characterized in the second measurement map comprises:

judging whether a first bulge exists in the region to be re-nucleated;

if yes, determining any first bump part as a reference bump part;

otherwise, determining at least one first bump closest to the edge of the region to be nucleated as a reference bump.

Through adopting above-mentioned technical scheme, the reference uplift portion is confirmed fast, chooses for use with the first uplift portion that waits to nucleate the region most closely as the reference uplift portion, the calculation of being convenient for.

Further, the determining the height of the second protrusion in the region to be nucleated based on the height of the reference protrusion comprises:

acquiring a first length between the reference bulge part and the axis of the bearing roller in a coordinate system;

acquiring a second length between the second rising part and the axis of the bearing roller in a coordinate system;

determining a ratio of the height of the reference bump to the first length as a first ratio;

and determining an actual distance between the second bump and the axis of the printing roller based on the second length and the first proportion, wherein the actual distance is the height of the second bump.

By adopting the technical scheme, the electronic equipment obtains the ratio of the image information to the actual height by calculating the ratio of the height of the reference bump to the first length in the coordinate system, so that the height of the second bump is obtained by calculation, the calculation process is simplified, and the more accurate height of the second bump is obtained.

Further, before the image information is arranged in sequence in the circumferential direction of the bearing drum and combined to generate the first measurement map, the method further includes: processing the image information:

carrying out Gaussian blur processing on the image information to generate first process image information;

carrying out binarization processing on the first process image information to generate second process image information;

and performing column-by-column extraction on the second process image information to generate processed image information.

By adopting the technical scheme, the electronic equipment processes the acquired image information, so that the interference of the measurement process is reduced, the clearer image information is obtained, and the more accurate first measurement image is favorably obtained.

In another possible implementation manner, the method further includes:

acquiring a plurality of image information for the same position;

processing the image information;

overlapping the plurality of processed image information;

determining at least two pieces of image information with the highest overlapping degree as comparison image information;

determining the coordinates of the outline in the comparison image information in a rectangular coordinate system, and obtaining optimized coordinates according to the average value of the at least two coordinates at the same position on the outline;

and obtaining optimized image information according to the optimized coordinates of each position on the contour.

By adopting the technical scheme, the electronic equipment obtains the optimized image information by acquiring the same image information for multiple times, and sequentially performing the image processing step and the process of calculating the coordinate mean value, so that the precision of the detection result is improved.

In a second aspect, the present application provides a device for detecting a raised portion on a printing plate surface of a printing press, which adopts the following technical solution:

the first acquisition module is used for acquiring a plurality of image information including reflected light rays, wherein the image information includes the profile of the first bulge part along the axial direction of the bearing roller and the height of the profile;

the first combination module is used for sequentially arranging the image information according to the circumferential direction of the bearing roller and combining to generate a first measurement diagram;

the comparison module is used for comparing the first measurement image with a preset standard image and determining an inconsistent region to be subjected to review;

the second acquisition module is used for acquiring the scanned image information of the region to be rechecked;

the second combination module is used for combining the scanned image information with the first measurement diagram to generate a second measurement diagram;

a reference bump determining module, configured to determine at least one reference bump according to the region to be re-examined in the second measurement map;

a second bump determining module for determining a height of a second bump in the region to be nucleated based on the height of the reference bump.

By adopting the technical scheme, the first acquisition module acquires image information comprising reflected light rays, the first combination module acquires a first measurement image according to image information combination, the comparison module compares the first measurement image with a preset standard image to determine a region to be rechecked, the second acquisition module acquires scanned image information of the region to be rechecked, the second combination module combines the scanned image information on the first measurement image to generate a more complete second measurement image, and the reference bump determination module and the second bump determination module determine the height of a second bump in the region to be rechecked according to the actual height of a reference bump in the second measurement image, so that double detection is applied, a more complete detection result of the bump on the surface of the printing plate is obtained, and the detection precision is improved.

In a third aspect, the present application provides an electronic device, which adopts the following technical solutions:

an electronic device, comprising:

at least one processor;

a 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 configured to: performing the method of any one of the first aspect.

By adopting the technical scheme, the processor executes the application program in the memory, the image information including the reflected light is obtained, the first measurement graph is obtained according to the image information combination, the first measurement graph is compared with the preset standard graph, the area to be rechecked is determined, the scanned image information of the area to be rechecked is further obtained, the scanned image information is combined on the first measurement graph, the more complete second measurement graph is generated, the electronic equipment determines the height of the second bulge in the area to be rechecked according to the actual height of the reference bulge in the second measurement graph, therefore, double detection is applied, the more complete detection result of the bulge on the surface of the printing plate is obtained, and the detection precision is improved.

In a fourth aspect, the present application provides a system for detecting a raised portion on a printing plate surface of a printing press, which adopts the following technical solution:

a printing plate surface crowning detection system for a printing press, comprising:

the electronic device according to the third aspect;

the light detection device is used for detecting the surface of the bearing cylinder with the printing plate to obtain image information with reflected light;

the laser triangulation sensor is used for scanning a to-be-rechecked area of the bearing cylinder with the printing plate to obtain a scanned image of the to-be-rechecked area;

the light ray detection device and the laser triangulation sensor are connected with the electronic equipment.

By adopting the technical scheme, the electronic equipment acquires the image information comprising the reflected light through the light detection device, the first measurement graph is obtained according to the image information combination, the area to be rechecked is determined after the first measurement graph is compared with the preset standard graph, the scanning image information of the area to be rechecked is further acquired according to the laser triangulation sensor, the scanning image information is combined on the first measurement graph to generate a more complete second measurement graph, and the electronic equipment determines the height of the second bulge in the area to be rechecked according to the actual height of the reference bulge in the second measurement graph, so that double detection is applied, a more complete detection result of the bulge on the surface of the printing plate is obtained, and the detection precision is improved.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the electronic equipment acquires image information comprising reflected light rays, a first measurement image is obtained according to image information combination, a region to be rechecked is determined after the first measurement image is compared with a preset standard image, then scanning image information of the region to be rechecked is obtained, a more complete second measurement image is generated after the scanning image information is combined on the first measurement image, and then the electronic equipment determines the height of a second bulge in the region to be rechecked according to the actual height of a reference bulge in the second measurement image, so that double detection is applied, a more complete detection result of the bulge on the surface of the printing plate is obtained, the detection precision is improved, and the quality of a printed product is improved;

2. according to the characteristics of the scanned image, the candidate rechecking area is processed, the area to be rechecked is determined, the frequency of acquiring the scanned image of the area to be rechecked by the electronic equipment is reduced, and the efficiency is improved;

3. the electronic equipment processes the acquired image information, interference in the measuring process is reduced, clearer image information is obtained, and a more accurate first measuring image is obtained.

Drawings

FIG. 1 is a schematic front view of a raised area detection system for a printing plate surface of a printing press according to an embodiment of the present invention.

FIG. 2 is a schematic side view of a raised area detection system for a printing plate surface of a printing press according to an embodiment of the present invention.

FIG. 3 is a block diagram of a raised area detection system for a printing plate surface of a printing press according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of image information in the embodiment of the present application.

Fig. 5 is a flowchart of steps S101 to S107 of the method for detecting the raised part on the surface of the printing plate of the printing press in the embodiment of the present application.

Fig. 6 is a schematic structural view of the first raised part and the second raised part in the embodiment of the present application.

FIG. 7 is a schematic diagram of a region to be reviewed in the embodiment of the present application.

FIG. 8 is a block diagram showing the structure of a raised part detecting apparatus for a printing plate surface of a printing press according to an embodiment of the present invention.

Fig. 9 is a block diagram of the electronic device in the embodiment of the present application.

Reference numerals:

1. detecting the box body; 2. a rotating shaft; 3. a motor; 4. a bearing roller; 5. a sleeve; 6. printing plate; 7. a light detecting device; 71. a radiation source; 72. an optical receiver; 8. a lower shielding part; 9. a reference object; 10. an upper shielding part; 11. the outline of the upper shielding part; 12. the profile of the surface of the printing plate; 13. a laser triangulation sensor; 14. a slider; 15. a slide rail; 16. a lead screw; 17. a controller; 18. a wireless communication module; 300. an electronic device.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In addition, the term "and/or" herein is only one kind of association relationship describing the association object, and means that there may be three kinds of relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship, unless otherwise specified.

The embodiment of the application discloses a system for detecting raised parts on the surface of a printing plate of a printing machine. Referring to fig. 1 and 2, the printing plate surface bump detection system of the printing machine comprises a detection box body 1, wherein a motor 3 is arranged in the detection box body 1, and the motor 3 is connected with a rotating shaft 2 and drives the rotating shaft 2 to rotate. A support roller 4 is fixed on the rotary shaft 2, and a sleeve 5 is arranged around the support roller 4, wherein the sleeve 5 can be pushed onto the support roller 4 from the side. The printing forme 6 is fixed on the arc-shaped side of the sleeve 5 by means of adhesive tape, and the support cylinder 4 can have openings in its circumferential surface, through which pressurized air can be ejected for expanding the sleeve 5 and for generating an air cushion during displacement. The sleeve 5 with the printing plate 6 can be removed from the inspection box 1 after the measurement and can be mounted on the impression cylinder of the printing unit in the printing machine. It is thus possible to simulate an impression cylinder in a printing press when the sleeve 5 is mounted on the carrier cylinder 4.

In order to measure the raised part of the printing plate surface without contact, the printing plate surface raised part detection system of the printing press comprises a light detection device 7, the light detection device 7 comprises a plurality of radiation sources 71, the radiation sources 71 can be light sources or other electromagnetic radiation sources 71, the light sources are preferably LED light sources, and the electromagnetic radiation sources 71 are infrared radiation sources; at least one light receiver 72 is also included, and the light receiver 72 may be an area camera.

The radiation sources 71 are arranged in a row at one side of the bearing roller 4, and the arrangement direction of the radiation sources 71 is parallel to the axial direction of the bearing roller 4; the light receiver 72 is disposed on the other side of the carrying drum 4 in parallel with the axial direction of the carrying drum 4, and the light receiver 72 is disposed opposite to the radiation source 71. The radiation source 71 generates a light curtain above the bearing cylinder 4, the light curtain irradiates on the bearing cylinder 4 fixed with the printing plate 6 to generate a lower shielding part 8, the lower shielding part 8 is a contour generated on the surface of the printing plate 6 along a current bus, the light receiver 72 receives light reflected by the light curtain through the reflector, the reflected light does not include the lower shielding part 8, and therefore the image information received by the light receiver 72 includes a contour of the raised part along the axial direction of the printing roller.

Referring to fig. 3, the radiation source 71 and the optical receiver 72 are both connected to a controller 17, the controller 17 is connected to a wireless communication module 18, the controller 17 wirelessly communicates with the electronic device 300 through the wireless communication module 18, the optical receiver 72 transmits the received image information to the electronic device 300, and the electronic device 300 receives the image information transmitted by the optical receiver 72.

Referring to fig. 1, 2 and 4, a reference object 9 is fixed on the detection box 1 directly above the axis of the bearing roller 4, and the reference object 9 may be a tensioned thin line or a beam. Therefore, when the light curtain passes through the reference object 9, the upper shielding portion 10 is generated, and therefore the image information received by the light receiver 72 does not include the upper shielding portion 10, the top edge is the outline 11 of the upper shielding portion, and the bottom edge is the outline 12 of the printing plate surface.

After the printing plate 6 is installed, the position of the reference object 9 is adjusted to make the distance between the bottom edge of the reference object 9 and the axis of the bearing cylinder 4 be a preset distance. Therefore, after the electronic device 300 receives the image information sent by the light receiver 72, the radius between the contour and the axis, that is, the height of the contour, can be determined according to the distance between the upper shielding part 10 and the axis of the carrying roller 4.

During the measurement, the controller 17 controls the motor 3 to rotate so that the plate 6 is rotated by the carrying cylinder 4, so that all the raised portions can be detected in the circumferential direction. The electronic device 300 can derive the topographic map and the height of the individual elevations from the angular position of the carrying cylinder 4.

The detection box body 1 is also internally provided with a laser triangulation sensor 13, the laser triangulation sensor 13 can be arranged on a slide block 14, the detection box body 1 is provided with a slide rail 15 extending along the axial direction of the bearing roller 4, the slide block 14 is connected on the slide rail 15 in a sliding manner, the slide rail 15 is also provided with a lead screw 16, the lead screw 16 can drive the slide block 14 to slide along the slide rail 15, and the laser triangulation sensor 13 can scan the contour of the surface of the printing plate 6. The laser triangulation sensor 13 and the lead screw 16 are both connected with the controller 17, and the controller 17 can control the lead screw 16 to move to adjust the position of the laser triangulation sensor 13 and send a scanned image scanned by the laser triangulation sensor 13 to the electronic device 300.

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, the position to be scanned is rotated to be opposite to 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 bearing roller 4 move in a coordinated manner, the laser triangulation sensor 13 scans all areas to be scanned, and the laser triangulation sensor 13 sends the scanned image to the electronic device 300 in real time.

The present application also provides a method for detecting raised portions on a printing plate surface of a printing press, which is performed by an electronic device, and with reference to fig. 5, the method includes:

step S101: a plurality of image information including reflected light is acquired, the image information including a profile of the first raised portion in an axial direction of the bearing roller and a height of the profile.

Specifically, the electronic device is connected to the optical receiver and receives image information transmitted by the optical receiver.

The raised parts represented in the image information are all the first raised parts, namely the first raised parts are not shielded by other raised parts. The raised part on the printing plate further comprises a second raised part which is clamped between two higher first raised parts, and light rays are easily blocked by the first raised parts, so that in image information acquired by the electronic image, an accurate outline of the second raised part is difficult to obtain.

Reference numeral 6,A denotes a first raised portion, and B denotes a second raised portion.

Step S102: and sequentially arranging the plurality of image information according to the circumferential direction of the bearing roller, and combining to generate a first measurement diagram.

Specifically, each image information is a section of a bearing cylinder with a printing plate, the electronic device sequentially arranges the image information according to the angular position of the motor and the image information corresponding to the angular position, and then the image information is spliced and combined to obtain a three-dimensional image which is a first measurement image.

Step S103: and comparing the first measurement image with a preset standard image to determine the inconsistent region to be rechecked. Specifically, the method includes (step S1031 to step S1033):

step S1031: and placing the first measurement diagram and a preset standard diagram in the same coordinate system.

Specifically, after the electronic device generates the first measurement map, the first measurement map is placed in the three-dimensional coordinate system, so that each point in the first measurement map has a unique corresponding coordinate.

The standard drawing is a drawing of a bearing cylinder with a standard printing plate, wherein the picture and text on the standard printing plate are complete.

Step S1032: and comparing the contours in the first measurement image with the contours of corresponding positions in the standard image one by one to determine inconsistent contours.

Specifically, since all the bumps are included in the standard chart, the first bumps are aligned, and the electronic device can determine the second bumps by aligning the non-aligned contours.

Step S1033: and determining a candidate review area according to the inconsistent contour, wherein the candidate coincidence area comprises the inconsistent contour and an area which is positioned in a preset range around the inconsistent contour.

Specifically, if the part S in the drawing is one of the inconsistent contours determined by the electronic device through comparison, first coordinates of the inconsistent contour are determined, then a circle is drawn along the surface of the printing plate with each first coordinate as the center and a preset value as the radius, a plurality of circular arc-shaped preset ranges are determined, and the preset ranges are combined to obtain a candidate review area M, wherein the inconsistent contour is also located in the candidate review area.

Further, since the laser triangulation sensor can only scan a rectangular area, when the laser triangulation sensor scans the surface of the printing plate, the laser triangulation sensor actually scans an arc-shaped area, and therefore the electronic device optimizes the candidate review area M to generate a candidate review area N which meets the rule of detecting the moving line by the laser triangulation sensor.

Step S1034: judging whether each candidate review area is overlapped with other candidate review areas; if yes, go to step S1035; otherwise, step S1036 is performed.

Specifically, after determining the candidate review region, the electronic device may determine coordinates of any point on the surface of the printing plate in the candidate review region, and when the same coordinate point exists in any candidate review region and other candidate review regions, determine that the current candidate review region overlaps with other candidate review regions.

Step S1035: and combining the candidate review regions with the overlap into a region to be reviewed.

Specifically, the number of regions to be rechecked can be reduced.

Step S104: and acquiring the scanned image information of the region to be rechecked.

Specifically, the electronic device generates a to-be-handled task for scanning a to-be-rechecked area, so that the laser triangulation sensor sequentially processes the to-be-handled task, and scans the to-be-rechecked area corresponding to the bearing cylinder with the printing plate to obtain a scanned image of the to-be-rechecked area.

Step S105: the method for generating a second measurement map by combining the scan image information with the first measurement map includes (step S1051 to step S1056):

step S1051: a first distance between at least two reference points on the edge of the scanned image is acquired.

Specifically, since the size of the scanned image may not coincide with the size of the first measurement chart, and in many cases, the sizes of the two are unified.

The electronic equipment selects at least two reference points at any position on the edge of the scanned image, and after the two reference points are selected, a first distance between the two reference points in the scanned image is determined according to the current coordinates of the reference points.

Step S1052: and acquiring the coordinates of a reference point at the same position as the reference point in the region to be checked on the first measurement diagram.

In particular, the electronic device determines the same reference points on the first measurement map, and in order to facilitate selection of the same reference points, the electronic device may select the corner points of the scanned image as reference points.

Step S1053: a second distance between the at least two reference points is determined based on the coordinates of the reference points.

Step S1054: a scale is determined based on the first distance and the second distance.

Specifically, the electronic device divides the first distance by the second distance, i.e., calculates a scale.

For example, a first distance of 10cm and a second distance of 5cm, the scale bar is 2:1.

step S1055: the scanned image is scaled according to a scale.

Specifically, when the scale is larger than one, the scanned image is reduced according to the scale; and when the scale is smaller than one, amplifying the scanned image according to the scale.

Step S1056: and combining the scanned image information in the corresponding position in the first measurement image to generate a second measurement image, wherein the datum point in the second measurement image is overlapped with the reference point.

Step S106: determining at least one reference elevation from the region to be re-nucleated in the second measurement map, comprising: judging whether a first bulge exists in the region to be re-nucleated; if yes, determining any first bump part as a reference bump part; otherwise, at least one first bump closest to the edge of the region to be nucleated is determined as a reference bump.

Specifically, since the electronic apparatus knows the height of the first bump, the height of the second bump can be estimated by using the first bump as a reference bump and the height thereof as a reference.

Step S107: determining the height of the second bump in the region to be nucleated, based on the height of the reference bump, includes (step S1071-step S1074):

step S1071: a first length in a coordinate system between a reference ridge and an axis of a load bearing roller is obtained.

Step S1072: a second length in the coordinate system between the second bulge and the axis of the load bearing roller is obtained.

Step S1073: a first ratio is determined as a ratio of the height of the reference bump to the first length.

Step S1074: and determining the actual distance between the second bump and the axle center of the bearing roller based on the second length and the first proportion, wherein the actual distance is the height of the second bump.

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

For example: referring to fig. 6, the height R1 of the reference bump a is 14cm, the first length is 20cm, and the first ratio is 0.7. If the second length is 19.2cm, the height R2 of the second raised part B is 13.44cm.

In another possible implementation manner, the image information received by the electronic device may not be clear enough, and in order to improve the accuracy, before the electronic device sequentially arranges the plurality of image information in the circumferential direction of the bearing drum and combines the image information to generate the first measurement map, the method further includes: processing the image information:

carrying out Gaussian blur processing on the image information to generate first process image information; carrying out binarization processing on the first process image information to generate second process image information; and performing column-by-column extraction on the second process image information to generate processed image information.

In another possible implementation manner, in order to obtain a more accurate contour and contour height of the first bump from the image information, the method further includes (step S21 to step S26):

step S21: a plurality of image information is acquired for the same position.

Specifically, the electronic device rotates the bearing roller for multiple revolutions, and the electronic device acquires image information once every time the bearing roller rotates for one revolution, so that the electronic device can acquire multiple image information of each position.

Step S22: the image information is processed.

Specifically, the process of processing the image information by the electronic device executes the step of "processing the image information" described above.

Step S23: overlapping the plurality of processed image information;

specifically, when the superimposition is performed, the outlines of the upper shaded portions of the respective pieces of image information are superimposed.

Step S24: and determining at least two pieces of image information with the highest overlapping degree as comparison image information.

Specifically, when the number of point coincidences of contours in the image information is large, the degree of overlap of the two image information is high.

Step S25: and determining coordinates of the outline in the contrast image information in a rectangular coordinate system, and obtaining optimized coordinates according to the average value of at least two coordinates on the same position on the outline.

Specifically, the electronic device calculates an average value of at least two coordinates corresponding to the same position, and the more coordinates involved in the calculation, the more accurate the optimized coordinates.

Step S26: and obtaining optimized image information according to the optimized coordinates of each position on the contour.

Specifically, the electronic device connects the optimized coordinates to obtain the optimized image information.

In order to better perform the method, the embodiment of the present application further provides a device for detecting a raised area on the surface of a printing plate of a printing press, and referring to fig. 8, the device 200 for detecting a raised area on the surface of a printing plate of a printing press comprises:

a first obtaining module 201, configured to obtain a plurality of image information including reflected light, where the image information includes a profile of the first raised portion along an axial direction of the bearing roller and a height of the profile;

the first combination module 202 is used for sequentially arranging the plurality of pieces of image information in the circumferential direction of the bearing roller and combining the image information to generate a first measurement diagram;

the comparison module 203 is configured to compare the first measurement map with a preset standard map, and determine an inconsistent region to be subjected to review;

a second obtaining module 204, configured to obtain scanned image information of a region to be reviewed;

a second combining module 205, configured to combine the scanned image information with the first measurement map to generate a second measurement map;

a reference bump determining module 206, configured to determine at least one reference bump according to the region to be re-nucleated in the second measurement map;

a second bump determining module 207 for determining a height of a second bump in the region to be nucleated based on the height of the reference bump.

Further, the comparison module 203 is specifically configured to:

determining a candidate rechecking region according to the inconsistent contour, wherein the candidate conforming region comprises the inconsistent contour and a region in a preset range around the inconsistent contour;

if yes, combining all the overlapped candidate rechecking areas into an area to be rechecked;

otherwise, determining the candidate review region as the region to be reviewed.

Further, the second combination module 205 is specifically configured to:

acquiring a first distance between at least two reference points on the edge of a scanned image;

acquiring coordinates of a reference point which is in the same position as the reference point in the region to be checked on the first measurement image;

determining a second distance between the at least two reference points based on the coordinates of the reference points;

determining a scale based on the first distance and the second distance;

scaling the scanned image according to a scale;

and combining the scanned image information at the corresponding position in the first measurement image to generate a second measurement image, wherein the datum point in the second measurement image is overlapped with the reference point.

Further, the reference bump determining module 206 is specifically configured to:

judging whether a first bulge exists in the region to be re-nucleated;

if yes, determining any first bump part as a reference bump part;

otherwise, at least one first bump closest to the edge of the region to be re-nucleated is determined as a reference bump.

Further, the second bump determining module 207 is specifically configured to:

acquiring a first length between the reference bump and the axis of the bearing roller in a coordinate system;

acquiring a second length between the second bump and the axis of the bearing roller in a coordinate system;

determining a ratio of a height of the reference bump to the first length as a first ratio;

and determining the actual distance between the second bump part and the axle center of the bearing roller based on the second length and the first proportion, wherein the actual distance is the height of the second bump part.

In another possible implementation manner, the device 200 for detecting raised areas on the surface of a printing plate of a printing press further comprises an image information processing module, specifically configured to:

In another possible implementation, the apparatus 200 for detecting a raised area on a printing plate surface of a printing press further includes:

the third acquisition module is used for acquiring a plurality of image information aiming at the same position;

the image information processing module is used for processing the image information;

the overlapping processing module is used for overlapping a plurality of processed image information;

the comparison image information determining module is used for determining at least two pieces of image information with the highest overlapping degree as comparison image information;

the optimized coordinate determination module is used for determining coordinates of the outline in the comparison image information in the rectangular coordinate system and obtaining optimized coordinates according to the average value of at least two coordinates on the same position on the outline;

and the optimized image information determining module is used for obtaining optimized image information according to the optimized coordinates of each position on the contour.

Various changes and specific examples in the method in the foregoing embodiment are also applicable to the apparatus for detecting a raised area on a printing plate surface of a printing press in the present embodiment, and the method for detecting a raised area on a printing plate surface of a printing press in the present embodiment is obvious to those skilled in the art from the foregoing detailed description of the method for detecting a raised area on a printing plate surface of a printing press, so that details are not described herein for the sake of brevity of the description.

In order to better implement the above method, an embodiment of the present application provides an electronic device, and with reference to fig. 9, the electronic device 300 includes: a processor 301, a memory 303, and a display screen 305. The memory 303 and the display 305 are connected to the processor 301, such as via the bus 302. Optionally, the electronic device 300 may also include a transceiver 304. It should be noted that the transceiver 304 is not limited to one in practical applications, and the structure of the electronic device 300 is not limited to the embodiment of the present application.

The 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 device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor 301 may also be a combination of computing functions, e.g., comprising one or more microprocessors, a combination of a DSP and a microprocessor, or the like.

Bus 302 may include a path that transfers information between the above components. The bus 302 may be a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, or the like. The bus 302 may be divided into an address bus, a data bus, a control bus, and the like.

The Memory 303 may be a ROM (Read Only Memory) or other type of static storage device that can store static information and instructions, a RAM (Random Access Memory) or other type of dynamic storage device that can store information and instructions, an EEPROM (Electrically Erasable Programmable Read Only Memory), a CD-ROM (Compact Disc Read Only Memory) or other optical Disc storage, optical Disc storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to these.

The memory 303 is used for storing application program codes for executing the scheme of the application, and the processor 301 controls the execution. The processor 301 is configured to execute application program code stored in the memory 303 to implement the aspects illustrated in the foregoing method embodiments.

The electronic device 300 shown in fig. 9 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present application.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

In addition, it is to be understood that relational terms such as first and second, and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Claims

1. A method for detecting a raised portion on a surface of a printing plate of a printing press, comprising:

sequentially arranging a plurality of image information according to the circumferential direction of the bearing roller, and combining to generate a first measurement diagram;

acquiring the scanned image information of the region to be rechecked;

determining at least one reference bump according to the region to be re-examined in the second measurement map;

2. The method of claim 1, wherein comparing the first measurement map with a predetermined standard map to determine an inconsistent region to be examined comprises:

otherwise, determining the candidate review region as a region to be reviewed.

3. The method of claim 1, wherein combining the scan image information with the first measurement map to generate a second measurement map comprises:

acquiring coordinates of a reference point, which is at the same position as the reference point, in the region to be checked on the first measurement image;

determining a scale based on the first distance and the second distance;

scaling the scanned image according to the scale;

4. The method of claim 1, wherein said determining at least one reference protrusion from said region to be re-characterized in said second measurement map comprises:

judging whether a first bulge exists in the region to be re-nucleated;

if yes, determining any first bump part as a reference bump part;

5. The method of claim 1, wherein determining the height of the second bump in the region to be nucleated based on the height of the reference bump comprises:

6. The method of claim 1, wherein before arranging the plurality of image information sequentially in a circumferential direction of the carrier cylinder to combine and generate the first measurement map, the method further comprises: processing the image information:

and extracting centers column by column aiming at the second process image information to generate processed image information.

7. The method of claim 1, further comprising:

acquiring a plurality of image information for the same position;

processing the image information;

overlapping the plurality of processed image information;

8. A device for detecting a raised portion on a printing plate surface of a printing press, comprising:

9. An electronic device, comprising:

at least one processor;

a 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 configured to: performing the method according to any one of claims 1 to 7.

10. A system for detecting raised portions on a surface of a printing plate in a printing press, comprising:

the electronic device of claim 9;

the light detection device and the laser triangulation sensor are connected with the electronic equipment.