CN106383131B - Visual detection method, device and system for printed matter - Google Patents
Visual detection method, device and system for printed matter Download PDFInfo
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- CN106383131B CN106383131B CN201610836919.3A CN201610836919A CN106383131B CN 106383131 B CN106383131 B CN 106383131B CN 201610836919 A CN201610836919 A CN 201610836919A CN 106383131 B CN106383131 B CN 106383131B
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- 238000001514 detection method Methods 0.000 title claims abstract description 50
- 230000000007 visual effect Effects 0.000 title claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 84
- 238000011179 visual inspection Methods 0.000 claims abstract description 56
- 238000000034 method Methods 0.000 claims abstract description 37
- 238000012634 optical imaging Methods 0.000 claims description 11
- 230000003993 interaction Effects 0.000 claims description 8
- 238000003384 imaging method Methods 0.000 claims description 4
- 238000012797 qualification Methods 0.000 claims 1
- 238000012384 transportation and delivery Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000013439 planning Methods 0.000 description 2
- 208000003464 asthenopia Diseases 0.000 description 1
- 238000012550 audit Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 239000013072 incoming material Substances 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/956—Inspecting patterns on the surface of objects
- G01N21/95607—Inspecting patterns on the surface of objects using a comparative method
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/956—Inspecting patterns on the surface of objects
- G01N21/95607—Inspecting patterns on the surface of objects using a comparative method
- G01N2021/95615—Inspecting patterns on the surface of objects using a comparative method with stored comparision signal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/30—Computing systems specially adapted for manufacturing
Abstract
The invention provides a visual inspection method for printed matter, which comprises the steps of searching in a standard printed matter template library according to a material code corresponding to the printed matter to be inspected, and judging whether a standard printed matter template corresponding to the material code exists or not; when a standard printed matter template corresponding to the material code exists, acquiring template building time of the standard printed matter template; acquiring the issuing time of a corresponding digital drawing in a second external system according to the material code; comparing the establishing time with the issuing time, and judging whether the standard printed matter template needs to be updated or not; when the standard printed matter template is judged not to be updated, acquiring a printed matter image to be detected; and visually detecting the image of the to-be-detected printed matter and comparing the image with the standard printed matter template. The invention further provides a visual detection system for the printed matter.
Description
Technical Field
The invention relates to a visual detection method and a visual detection system, in particular to a visual detection method, a visual detection device and a visual detection system for printed matters.
Background
In order to ensure quality, the printed matter shipped from the printing factory still needs to be subjected to incoming material inspection before use, and the unqualified product is subjected to returning and changing treatment. The quality requirement can not be met by the spot test, and the visual fatigue of inspectors is easily caused by the fact that the printed matters are inspected one by means of visual inspection of human eyes, so that the efficiency is low, and the detection rate is low.
Disclosure of Invention
Based on the above, it is necessary to provide a visual inspection method, device and system for printed matter, aiming at the problem of low inspection efficiency of incoming printed matter.
A visual inspection method for printed matter, comprising: searching in a standard printed matter template library according to a material code corresponding to a printed matter to be detected, and judging whether a standard printed matter template corresponding to the material code exists or not; when a standard printed matter template corresponding to the material code exists, acquiring template building time of the standard printed matter template; acquiring the issuing time of a corresponding digital drawing in a second external system according to the material code; comparing the template establishing time with the issuing time, and judging whether the standard printed matter template needs to be updated or not; when the standard printed matter template does not need to be updated, acquiring a printed matter image to be detected; and visually detecting the image of the to-be-detected printed matter and comparing the image with the standard printed matter template.
In one embodiment, the method further comprises: acquiring identification information of a printed matter to be tested; and acquiring the corresponding material codes in the first external system according to the identification information.
In one embodiment, the method further comprises: when the standard printed matter template comprises a standard character area, a character recognition area is established in the printed matter image to be detected, the character recognition area corresponds to the standard character area in position, and character recognition is carried out on the character recognition area, so that a recognition character string is obtained;
acquiring a corresponding standard character string group in a third external system according to the material code; and
and searching in the standard character string group, and judging the character recognition area as a qualified area when the recognition character string is searched.
In one embodiment, in the step of visually inspecting the image of the printed matter to be inspected and comparing with the standard printed matter template, no comparison is made between the standard character area and the character recognition area.
In one embodiment, the method further includes outputting a standard print template absence prompt when the standard print template is determined to be absent.
In one embodiment, the method further includes outputting updated standard print template prompt information when it is determined that the standard print template needs to be updated.
In one embodiment, the method further comprises the step of creating the standard print template in a standard print template library, comprising: acquiring standard printed matter images, template building time and material codes; acquiring at least two characteristic values positioned at different positions in the standard printed matter template, wherein the at least two characteristic values are used for calibrating the image of the printed matter to be tested; and storing the standard printed matter image, the template establishing time, the material codes and the at least two characteristic values in the standard printed matter template library, and establishing a corresponding relation.
In one embodiment, the method further comprises: when the comparison shows that the image of the to-be-detected printed matter is not completely identical with the standard printed matter template, outputting all difference point information, and receiving a qualified instruction or an unqualified instruction input by a user; and when the disqualified instruction is received, outputting corresponding disqualified information to the first external system.
In one embodiment, the step of visually inspecting the image of the printed matter to be inspected and comparing the image with the standard printed matter template includes: and comparing whether at least one of the content, the color, the bar code system and the size between the image of the to-be-detected printed matter and the standard printed matter template is the same.
A visual inspection device for printed matter, the system comprising: the standard printed matter template retrieval module is used for retrieving in a standard printed matter template library according to the material code corresponding to the printed matter to be detected and judging whether the standard printed matter template corresponding to the material code exists or not; the time acquisition module is used for acquiring the template establishment time of the standard printed matter template when judging that the standard printed matter template exists, and acquiring the issuing time of a corresponding digital drawing in the second external system according to the material code; the comparison module is used for comparing the template establishment time with the issuing time and judging whether the standard printed matter template needs to be updated or not; the print image acquisition module is used for acquiring the image of the print to be detected when the standard print template is judged not to need to be updated; the visual detection module is used for performing visual detection on the image of the to-be-detected printed matter and comparing the image with the standard printed matter template.
In one embodiment, the method further comprises: the identification information acquisition module is used for acquiring identification information of the printed matter to be detected; and the material code acquisition module is used for acquiring the corresponding material code in the first external system according to the identification information.
In one embodiment, the system further includes a character recognition module, configured to, when the standard print template includes a standard character area, establish a character recognition area in the print image to be tested, where the character recognition area corresponds to the standard character area, perform character recognition on the character recognition area to obtain a recognition character string, obtain a corresponding standard character string set in a third external system according to the material code, and search the standard character string set, and when the recognition character string is searched, determine that the character recognition area is a qualified area.
In one embodiment, the visual detection module is further configured to perform visual detection on the standard print image to obtain the standard print template, and the print visual detection system further includes a template building module configured to build the standard print template in a standard print template library, where the template building module includes: the template information acquisition module is used for acquiring standard printed matter images, template establishment time and material codes; the characteristic value acquisition module is used for acquiring at least two characteristic values positioned at different positions in the standard printed matter template, and the at least two characteristic values are used for calibrating the image of the printed matter to be tested.
In one embodiment, the method further comprises: and the I/O module is used for outputting all difference point information when the image of the to-be-detected printed matter is considered to be not completely identical with the standard printed matter template through the comparison, receiving a qualified instruction or a disqualified instruction input by a user, and outputting corresponding disqualified information to the first external system when the disqualified instruction is received.
In one embodiment, the visual detection module is configured to compare whether at least one of the content, color, barcode system and size between the image of the printed matter to be detected and the standard printed matter template is the same.
In one embodiment, the system further comprises a storage module and a query module, wherein the storage module comprises: the template library is used for storing the standard printed matter template, the template establishment time and the material codes; the detection history storage unit is used for storing the detection total number, the qualified number, the unqualified number, unqualified images of the printed matter to be detected and the detection date; the inquiry module is used for inquiring the standard printed matter templates, the template establishing time and the material codes in the template library, and inquiring the detection total number, the qualified number, the unqualified images of the printed matters to be detected and the detection date in the detection history storage unit.
A visual inspection system for printed matter, comprising: the optical imaging device is used for optically imaging the to-be-detected printed matter on the conveyor belt; the visual detection device is used for searching in a standard printed matter template library according to the material code corresponding to the printed matter to be detected, judging whether a standard printed matter template corresponding to the material code exists, acquiring template establishment time of the standard printed matter template when judging that the standard printed matter template exists, comparing the template establishment time with the issuing time of a corresponding digital drawing in a second external system according to the material code, judging whether the standard printed matter template needs to be updated, acquiring an image of the printed matter to be detected when judging that the standard printed matter template does not need to be updated, visually detecting the image of the printed matter to be detected, and comparing the image with the standard printed matter template.
In one embodiment, the visual inspection device further comprises an identification information input device, the visual inspection device obtains identification information of the printed matter to be inspected from the identification information input device, and obtains the corresponding material code in the first external system according to the identification information.
In one embodiment, the system further comprises a man-machine interaction device, wherein the man-machine interaction device outputs standard-printed-matter-template-absence prompting information when judging that the standard-printed-matter template is not present, outputs updated standard-printed-matter-template prompting information when judging that the standard-printed-matter template needs to be updated, outputs all difference point information when judging that the image of the printed matter to be detected is not identical to the standard-printed-matter template through comparison, and receives a qualified instruction or a unqualified instruction input by a user.
The visual detection method, the visual detection device and the visual detection system for the printed matter detect the printed matter to be detected through the visual identification module and compare the detected printed matter with the standard printed matter template, so that the automatic detection of the printed matter can be realized, the detection precision is high, the detection time is short, and the false alarm rate is low. The time acquisition module and the comparison module acquire the establishment time of the standard printed matter template and compare the establishment time with the issuing time of the digital drawing, so that whether updating is needed or not can be judged, the digital drawing updating prompt function is realized, and the misuse of an old template can be effectively prevented.
Drawings
FIG. 1 is a flow chart of a visual inspection method for printed matter according to an embodiment of the present invention;
FIG. 2 is a schematic perspective view illustrating an internal structure of a visual inspection system for printed matter according to an embodiment of the present invention;
fig. 3 is a schematic top view illustrating an internal structure of a visual inspection system for printed matter according to an embodiment of the invention.
FIG. 4 is a schematic diagram showing module connection of a visual inspection device for printed matter according to an embodiment of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following describes the method, apparatus and system for visual inspection of printed matter according to the present invention in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, an embodiment of the present invention provides a visual inspection method for printed matter, including:
and S100, searching in a standard printed matter template library according to the material code corresponding to the printed matter to be detected, and judging whether the standard printed matter template corresponding to the material code exists or not. The material code is an identification character string of a certain printed matter in the first external system, and can be a string of numbers, letters or a combination of numbers and letters. The standard printed matter template is used for judging whether the printed matter to be detected is qualified or not, comprises a standard printed matter image, and can further comprise at least two characteristic values. The standard printed matter template is stored in the template library of the visual detection device in advance, and the template library can also store the one-to-one correspondence relation between the standard printed matter template and the material codes, so that the standard printed matter template can be obtained by searching the material codes. For example, the standard print template may be named with the material code, and the search queries the file name of the standard print template with the material code.
And S200, when the standard printed matter template exists, acquiring the template building time of the standard printed matter template. For example, when a standard print template named by the material code is retrieved, the standard print template may be determined to be present. The template creation time may be the creation time of the template, or the last modification time. The template creation time is stored in the template library.
S300, acquiring the issuing time of the corresponding digital drawing in the second external system according to the material code. The second external system may be a database, for example a database in a graphic system of an enterprise. The second external system stores a digital drawing for printing the printed matter to be tested, the issuing time of the digital drawing and the one-to-one correspondence relation between the material codes and the digital drawing. For example, the digitized drawing may be named with the material code. The second external system can output the corresponding issuing time of the digital drawing according to the input material codes. The digitized drawing may be the standard print image or the standard print image may be generated by software. The issuing time may be the last modification time of the digitized drawing, or may be a manually set time, such as an audit passing time or a time submitted to a printing factory, stored in the second external system.
S400, comparing the template establishment time with the issuing time, and judging whether the standard printed matter template needs to be updated or not. When the issuing time of the digital drawing is later than the template establishing time of the standard printed matter template, the standard printed matter template is judged to need to be updated, and when the issuing time is earlier, the standard printed matter template is judged to need not to be updated.
S500, when the standard printed matter template is judged not to need to be updated, obtaining a printed matter image to be detected. The print to be tested can be photographed by an industrial camera. In a preferred embodiment, the method can further comprise the step of processing the photo of the to-be-detected printed matter through an image acquisition card or software, such as smoothing noise or improving contrast.
S600, performing visual detection on the image of the to-be-detected printed matter, and comparing the image with the standard printed matter template. The comparison can be to compare at least one of the content, color, bar code system and size between the image of the printed matter to be detected and the standard printed matter template, and judge whether the images are the same, so as to realize detection of the problems of multiple characters (or patterns, symbols, etc.), few characters (or patterns, symbols, etc.), multiple holes, few holes, paste characters (or patterns, symbols, etc.), wrong characters (or patterns, symbols, etc.), missing strokes of characters (or patterns, symbols, etc.), broken lines, missing patterns, color errors, size errors, bar system errors of one-dimensional bar codes and two-dimensional bar codes, error of scanning content, discrepancy between bar code content and characters, etc.
Referring to fig. 2 to 3, the visual inspection method of printed matter is performed in the visual inspection system 1 of printed matter. The visual inspection system 1 for printed matter comprises a visual inspection device 12, a conveyor belt 18, an optical imaging device 10 and a man-machine interaction device 16. A start-stop device may be provided on the conveyor belt 18 to control the conveyor belt to transport the printed product to be tested under the optical imaging device 10. The optical imaging device 10 is used for optically imaging the printed matter to be tested on the conveyor belt 18 and transmitting the image of the printed matter to be tested to the visual inspection device 12. In addition, the image of the printed matter to be tested can be transmitted to the man-machine interaction device 16 for real-time display.
In one embodiment, the visual inspection method of printed matter further comprises the step of creating the standard printed matter template in a standard printed matter template library, comprising:
(1) Acquiring a standard printed matter image, template building time and material codes, wherein the standard printed matter image can be directly acquired from a standard printed matter through an industrial camera or can be acquired from the second external system;
(2) Acquiring at least two characteristic values positioned at different positions in the standard printed matter template, wherein the at least two characteristic values are used for calibrating the image of the printed matter to be tested; and
(3) And storing the standard printed matter image, the template establishing time, the material codes and the at least two characteristic values in the standard printed matter template library, and establishing a corresponding relation.
The characteristic value corresponds to the printing content of any position on the standard printed matter, and is selected by people, preferably characters or graphics (such as logo, parameters, titles and the like) capable of representing the printed matter. The number of the characteristic values is more preferably three, and the characteristic values located at different positions have fixed relative positions. In the subsequent step S600, the visual inspection device can calibrate the image of the printed matter to be tested according to the relative positions between the feature values.
In one embodiment, the printed matter visual inspection method further comprises: acquiring identification information of a printed matter to be tested; and acquiring the corresponding material codes in the first external system according to the identification information.
The visual inspection system 1 may further include an identification information input device 14. The identification information input device 14 may be a code scanner for inputting identification information of the printed matter to be tested, and the identification information may be identification information identifying a lot of substantially or completely identical printed matter to be tested. The external system, such as a manufacturing process execution management system (MES) system of a manufacturing enterprise, stores the correspondence between the identification information and the logistics code, and can output the corresponding material code according to the input identification information.
In one embodiment, the visual inspection method of printed matter further comprises outputting a standard printed matter template absence prompting message when the standard printed matter template is judged to be absent. The prompt message may be specifically output through an output device, such as a display, in the human-machine interaction device 16.
In one embodiment of the step S400, the visual inspection method of printed matter further includes outputting a prompt message for updating the standard printed matter template when it is determined that the standard printed matter template needs to be updated.
The printed matter to be measured may be a quantitative printed matter, that is, a plurality of printed matter to be measured in the same batch is identical, or may be a variable printed matter, that is, a plurality of printed matter to be measured in the same batch has variable information distinguished from each other at a local position, where the variable information is usually character information, and may include serial numbers or dates, for example. In the step of establishing the standard print template, the method may further include a step of acquiring a standard character recognition area; and storing the standard printed matter image, the template establishing time, the material code, the at least two characteristic values and the character recognition area in the standard printed matter template library, and establishing a corresponding relation. The visual inspection method of printed matter may further include:
(1) When the standard printed matter template comprises a standard character area, a character recognition area is established in the printed matter image to be detected, the character recognition area corresponds to the standard character area in position, and character recognition is carried out on the character recognition area, so that a recognition character string is obtained;
(2) Acquiring a corresponding standard character string group in a third external system (such as an enterprise resource planning system) according to the material code; and
(3) And searching in the standard character string group, and judging the character recognition area as a qualified area when the recognition character string is searched.
And the third external system, such as an enterprise resource planning system, stores a one-to-one correspondence between the standard character string group and the material codes. The third external system can output the standard character string group according to the input material codes. The standard string set includes a series of strings, which may be, for example, consecutive serial numbers or dates. By searching in the standard character string group, whether the identification character string exists in the standard character string group or not can be judged, if so, the identification character string is proved to be correct, and the identification area is judged to be a qualified area; if the character string does not exist, the character string is wrongly identified, and the identification area is judged to be a disqualified area. The visual inspection method of printed matter may further include a step of outputting a result of the judgment of the character string recognition area.
In addition, in the step S600 of visually detecting the image of the printed matter to be detected and comparing with the standard printed matter template, the standard character area is not compared with the character recognition area, and only the area outside the standard character area in the standard printed matter template is compared with the area outside the character recognition area in the image of the printed matter to be detected.
In one embodiment, the printed matter visual inspection method further comprises:
(1) When the comparison shows that the image of the to-be-detected printed matter is not completely identical with the standard printed matter template, outputting all difference point information, and receiving a qualified instruction or an unqualified instruction input by a user; and
(2) And when the disqualified instruction is received, outputting corresponding disqualified information to the first external system.
Those skilled in the art will appreciate that implementing all or part of the above-described methods in accordance with the embodiments may be accomplished by way of a computer program stored on a computer readable storage medium, which when executed may comprise the steps of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), or the like.
Referring to fig. 4, the present invention further provides a visual inspection device for printed matter, including: the standard printed matter template retrieval module 100 is used for retrieving in a standard printed matter template library according to the material code corresponding to the printed matter to be detected, and judging whether the standard printed matter template corresponding to the material code exists or not; the time acquisition module 200 is configured to acquire a template setup time of the standard print template when the standard print template is determined to exist, and acquire a delivery time of a corresponding digitized drawing in the second external system according to the material code; the comparison module 300 is configured to compare the template setup time with the delivery time, and determine whether the standard print template needs to be updated; the print image acquisition module 400 is configured to acquire an image of the print to be tested when it is determined that the standard print template does not need to be updated; the visual detection module 500 is configured to perform visual detection on the image of the to-be-detected printed matter, and compare the image with the standard printed matter template.
In one embodiment, the method further comprises: an identification information acquisition module 110, configured to acquire identification information of a printed matter to be tested; and a material code obtaining module 120, configured to obtain a corresponding material code in the first external system according to the identification information. The identification information acquisition module 110 may be connected to the identification information input device 14, and the identification information of the printed matter to be tested may be acquired from the identification information input device 14. The identification information acquisition module 110 is connected to the material code acquisition module 120, and transmits the identification information to the material code acquisition module 120. The material code acquisition module 120 transmits the identification information to the first external system and receives the material code from the first external system.
In one embodiment, the method further includes a character recognition module 600, configured to, when the standard print template includes a standard character area, establish a character recognition area in the print image to be tested, where the character recognition area corresponds to the standard character area, perform character recognition on the character recognition area to obtain a recognition character string, obtain a corresponding standard character string set in a third external system according to the material code, and search the standard character string set, and when the recognition character string is searched, determine that the character recognition area is a qualified area.
In one embodiment, the visual inspection apparatus further includes a template creation module 700 for creating the standard print template in a standard print template library 810, the template creation module comprising: the template information acquisition module 710 is used for acquiring standard printed matter images, template establishment time and material codes; the feature value obtaining module 720 is configured to obtain at least two feature values located at different positions in the standard print template, where the at least two feature values are used to calibrate the print image to be tested.
The visual inspection device further includes a storage module 800 including a template library 810 for storing the standard print template, template setup time, material encoding, and the at least two feature values.
In one embodiment, the method further comprises: and the I/O module is used for outputting all difference point information when the image of the to-be-detected printed matter is considered to be not completely identical with the standard printed matter template through the comparison, receiving a qualified instruction or a disqualified instruction input by a user, and outputting corresponding disqualified information to the first external system when the disqualified instruction is received.
In one embodiment, the visual detection module 500 is configured to compare whether at least one of the content, color, barcode system and size between the image of the printed matter to be detected and the standard printed matter template is the same.
In one embodiment, the storage module 800 further includes a detection history storage unit 820 for storing a detection total number, a pass number, a fail print image to be detected, and a detection date.
In one embodiment, the method further comprises: the query module is configured to query the standard printed matter template, the template creation time, the material code, and the at least two feature values in the template library 810, and query the detection total number, the number of pass, the number of fail, the failed image of the printed matter to be detected, and the detection date in the detection history storage unit 820.
The embodiment of the invention further provides a visual inspection system 1 for printed matters, which comprises an optical imaging device 10 and a visual inspection device 12. The optical imaging device 10 is used for optically imaging the print to be tested on the conveyor belt 18. The visual inspection device 12 is configured to search in a standard print template library according to a material code corresponding to a print to be inspected, determine whether a standard print template corresponding to the material code exists, obtain a template setup time of the standard print template when the standard print template is determined to exist, obtain a delivery time of a corresponding digitized drawing in a second external system according to the material code, compare the setup time with the delivery time, determine whether the standard print template needs to be updated, obtain a print image to be inspected when the standard print template does not need to be updated, and visually inspect the print image to be inspected and compare the print image to be inspected with the standard print template.
In one embodiment, the visual inspection apparatus 12 further includes an identification information input device 14, and the visual inspection apparatus 12 obtains the identification information of the printed matter to be inspected from the identification information input device 14, and obtains the corresponding material code in the first external system according to the identification information. The identification information input device 14 is preferably a code scanner or a keyboard for a user to manually input identification information.
In one embodiment, the system further includes a man-machine interaction device 16, such as a display and a keyboard, for outputting prompt information of the standard print template when the standard print template is judged to be absent, outputting prompt information of the updated standard print template when the standard print template is judged to be required to be updated, outputting information of all difference points when the image of the print to be detected is considered to be not identical to the standard print template through the comparison, and receiving a pass instruction or a fail instruction input by a user.
The visual inspection system 1 further includes a conveyor belt 18, a sensor 20, and a controller 22, wherein the conveyor belt 18 is used for placing the printed matter to be inspected. The controller 22 is configured to control the operation of the conveyor 18, and in particular, may control the advancing, retracting, and stopping of the conveyor 18 by receiving user instructions from the human interaction device 16. The sensor 20 is used to sense the running position of the conveyor belt 18, in particular for positioning the print to be measured under the optical imaging device 10. The sensor 20 may be a color sensor for detecting a color change of the surface of the conveyor belt 18 or an optical sensor for detecting a brightness change of the surface of the conveyor belt 18. Taking the color sensor as an example, the surface of the conveyor belt 18 has a marking area 182 for positioning, the color difference between the color of the marking area 182 and the color of the conveyor belt 18 outside the marking area 182 can be sensed by the color sensor, and when the color sensor senses that the marking area 182 moves to the sensing area of the color sensor, the color sensor sends a trigger signal to the controller 22. The controller 22 is capable of acquiring the trigger signal sent by the sensor 20 and controlling the stopping of the movement of the conveyor belt 18 in accordance with the trigger signal.
When it is determined that the standard print template does not need to be updated, the conveyor 18 receives instructions from the controller 22 to advance the conveyor, and when the sensor 20 senses that the print under test moves under the optical imaging device 10, a trigger signal is sent to the controller 22. The controller 22 receives the trigger signal and stops the conveyor belt 18, and simultaneously sends a photographing instruction to the optical imaging device 10 to control the optical imaging device 10 to optically image the printed matter to be tested and send the image of the printed matter to be tested to the visual inspection device 12.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (16)
1. A visual inspection method for printed matter, comprising:
searching in a standard printed matter template library according to a material code corresponding to a printed matter to be detected, and judging whether a standard printed matter template corresponding to the material code exists or not;
when a standard printed matter template corresponding to the material code exists, acquiring template building time of the standard printed matter template;
acquiring the issuing time of a corresponding digital drawing in a second external system according to the material code;
comparing the template establishing time with the issuing time, and judging whether the standard printed matter template needs to be updated or not; when the issuing time of the digital drawing is later than the template establishing time of the standard printed matter template, judging that the standard printed matter template needs to be updated, and when the issuing time is earlier, judging that the standard printed matter template does not need to be updated;
when the standard printed matter template does not need to be updated, acquiring a printed matter image to be detected; and
visual detection is carried out on the image of the to-be-detected printed matter, and the image is compared with the standard printed matter template;
further comprises: when the standard printed matter template comprises a standard character area, a character recognition area is established in the printed matter image to be detected, the character recognition area corresponds to the standard character area in position, and character recognition is carried out on the character recognition area, so that a recognition character string is obtained;
acquiring a corresponding standard character string group in a third external system according to the material code; and
and searching in the standard character string group, and judging the character recognition area as a qualified area when the recognition character string is searched.
2. The visual inspection method of printed matter of claim 1, further comprising:
acquiring identification information of a printed matter to be tested;
and acquiring the corresponding material codes in the first external system according to the identification information.
3. The visual inspection method of printed matter according to claim 1, wherein in the step of visually inspecting the image of the printed matter to be inspected and comparing with the standard print template, only the area outside the standard character area in the standard print template is compared with the area outside the character recognition area in the image of the printed matter to be inspected.
4. The visual inspection method of printed matter of claim 1, further comprising outputting a standard printed matter template-absent prompt when the standard printed matter template is judged to be absent, and outputting an updated standard printed matter template prompt when the standard printed matter template is judged to be updated.
5. The visual inspection method of printed matter of claim 1, further comprising the step of creating a standard print matter template in a standard print matter template library, comprising:
acquiring standard printed matter images, template building time and material codes;
acquiring at least two characteristic values positioned at different positions in the standard printed matter image, wherein the at least two characteristic values are used for calibrating the printed matter image to be tested; and
and storing the standard printed matter image, the template establishing time, the material codes and the at least two characteristic values in the standard printed matter template library, and establishing a corresponding relation.
6. The visual inspection method of printed matter of claim 2, further comprising:
when the comparison shows that the image of the to-be-detected printed matter is not completely identical with the standard printed matter template, outputting all difference point information, and receiving a qualified instruction or an unqualified instruction input by a user;
and when the disqualified instruction is received, outputting corresponding disqualified information to the first external system.
7. The visual inspection method of printed matter according to claim 1, wherein the step of visually inspecting the image of the printed matter to be inspected and comparing with the standard printed matter template comprises:
and comparing at least one of the content, the color, the bar code system and the size between the image of the to-be-detected printed matter and the standard printed matter template.
8. A visual inspection device for printed matter, comprising:
the standard printed matter template retrieval module (100) is used for retrieving in a standard printed matter template library according to the material code corresponding to the printed matter to be detected and judging whether the standard printed matter template corresponding to the material code exists or not;
the time acquisition module (200) is used for acquiring the template establishment time of the standard printed matter template when judging that the standard printed matter template exists, and acquiring the issuing time of a corresponding digital drawing in a second external system according to the material code;
the comparison module (300) is used for comparing the template establishment time with the issuing time and judging whether the standard printed matter template needs to be updated or not; when the issuing time of the digital drawing is later than the template establishing time of the standard printed matter template, judging that the standard printed matter template needs to be updated, and when the issuing time is earlier, judging that the standard printed matter template does not need to be updated;
the printed matter image acquisition module (400) is used for acquiring an image of the printed matter to be detected when the standard printed matter template is judged not to need to be updated;
the visual detection module (500) is used for performing visual detection on the image of the to-be-detected printed matter and comparing the image with the standard printed matter template;
the system further comprises a character recognition module (600) which is used for establishing a character recognition area in the image of the to-be-detected printed matter when the standard printed matter template comprises a standard character area, wherein the character recognition area corresponds to the standard character area in position, carrying out character recognition on the character recognition area to obtain a recognition character string, acquiring a corresponding standard character string group in a third external system according to the material code, searching in the standard character string group, and judging the character recognition area as a qualified area when the recognition character string is searched.
9. The visual inspection device of printed matter of claim 8, further comprising:
the identification information acquisition module (110) is used for acquiring identification information of the printed matter to be detected; and
and the material code acquisition module (120) is used for acquiring the corresponding material code in the first external system according to the identification information.
10. The visual inspection device of printed matter of claim 8, further comprising a template creation module (700) for creating the standard printed matter template in a standard printed matter template library, the template creation module (700) comprising:
the template information acquisition module (710) is used for acquiring standard printed matter images, template establishment time and material codes; and
and the characteristic value acquisition module (720) is used for acquiring at least two characteristic values positioned at different positions in the standard printed matter template, wherein the at least two characteristic values are used for calibrating the image of the printed matter to be tested.
11. The visual inspection device of printed matter as set forth in claim 9, further comprising:
and the I/O module is used for outputting all difference point information when the image of the to-be-detected printed matter is considered to be not completely identical with the standard printed matter template through the comparison, receiving a qualified instruction or a disqualified instruction input by a user, and outputting corresponding disqualified information to the first external system when the disqualified instruction is received.
12. The visual inspection device of claim 8, wherein the visual inspection module (500) is configured to compare whether at least one of content, color, bar code system and size between the image of the printed matter to be inspected and the standard printed matter template are the same.
13. The visual inspection device of printed matter according to claim 8, further comprising a storage module (800) and a query module (900), the storage module (800) comprising:
the template library (810) is used for storing the standard printed matter template, the template establishment time and the material codes; and
a detection history storage unit (820) for storing the detection total number, the qualification number, the disqualification number, the disqualified images of the printed matter to be detected and the detection date;
the query module (900) is used for querying standard printed matter templates, template building time and material codes in the template library (810), and is used for querying the detection total number, the number of qualified products, the number of unqualified products, unqualified images of the printed matters to be detected and the detection date in the detection history storage unit (820).
14. A visual inspection system for printed matter, comprising:
an optical imaging device (10) for optically imaging the printed matter to be tested on the conveyor belt;
the visual detection device (12) is used for searching in a standard printed matter template library according to a material code corresponding to a printed matter to be detected, judging whether a standard printed matter template corresponding to the material code exists, acquiring template establishment time of the standard printed matter template when the standard printed matter template is judged to exist, comparing the template establishment time with issuing time of a corresponding digital drawing in a second external system according to the material code, judging whether the standard printed matter template needs to be updated when the issuing time of the digital drawing is later than the template establishment time of the standard printed matter template, and judging that the standard printed matter template does not need to be updated when the standard printed matter template is earlier than the standard printed matter template; when the standard printed matter template is judged not to need to be updated, acquiring a printed matter image to be detected, visually detecting the printed matter image to be detected, and comparing the detected printed matter image with the standard printed matter template; and when the standard printed matter template comprises a standard character area, establishing a character recognition area in the printed matter image to be detected, wherein the character recognition area corresponds to the standard character area, carrying out character recognition on the character recognition area to obtain a recognition character string, acquiring a corresponding standard character string group in a third external system according to the material code, and searching in the standard character string group, and judging the character recognition area as a qualified area when the recognition character string is searched.
15. The visual inspection system of printed matter of claim 14, further comprising an identification information input device (14), wherein the visual inspection apparatus (12) obtains identification information of the printed matter to be inspected from the identification information input device (14) and obtains the corresponding material code in the first external system based on the identification information.
16. The visual inspection system of printed matter according to claim 14, further comprising a human-computer interaction device (16) that outputs a standard printed matter template-absent prompt when the standard printed matter template is judged to be absent, outputs an updated standard printed matter template prompt when the standard printed matter template is judged to be updated, outputs all difference point information when the image of the printed matter to be inspected is considered to be not identical to the standard printed matter template by the comparison, and receives a pass instruction or a fail instruction input by a user.
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