1. A method for detecting a print quality, comprising:

setting detection parameters of a standard printed matter, wherein the detection parameters comprise pattern information, a detection area and detection precision;

numbering the presswork to be detected, and carrying out comparative analysis on the pattern information of the detection area of the presswork to be detected according to the detection parameters; wherein the content of the first and second substances,

the pattern information comprises pattern contour line width, pattern area, pattern color and luster and pattern definition;

and outputting a printing quality detection list.

2. The print quality inspection method according to claim 1, further comprising, before the outputting of the print quality detection list:

triggering an alarm signal when the N printed matters to be detected which are continuously numbered are detected to be printed with the printing defects; wherein the content of the first and second substances,

n is an integer and is not less than 3;

and when at least one item of pattern information of the to-be-detected printed matter is detected to be not in accordance with the standard of the detection parameter, marking as a printing defect.

3. The print quality detection method according to claim 2, further comprising:

and when the printed matter to be detected is detected to have the printing defect, recording the detection time, the defect type and the position information of the printing defect, and storing the information into the printing quality detection list.

4. The method for detecting the quality of the printed matter according to claim 1, wherein before numbering the printed matter to be detected, the method further comprises the following steps:

and acquiring an image of the to-be-detected printed matter through an industrial camera, wherein the acquisition frequency of the industrial camera is synchronous with the printing frequency of the printed matter.

5. The method of claim 1, further comprising:

and respectively setting detection precision for each detection area of the standard printed matter according to the detection requirement of the printed matter.

6. A printing quality detection apparatus, comprising:

the device comprises a setting module, a detection module and a processing module, wherein the setting module is used for setting detection parameters of a standard printed matter, and the detection parameters comprise pattern information, a detection area and detection precision;

the detection module is used for numbering the presswork to be detected and carrying out comparison analysis on the pattern information of the detection area of the presswork to be detected according to the detection parameters; wherein the content of the first and second substances,

the pattern information comprises pattern contour line width, pattern area, pattern color and luster and pattern definition;

and the output module is used for outputting the printing quality detection list.

7. The print quality detection apparatus according to claim 6, further comprising:

the acquisition module is used for acquiring the image of the to-be-detected printed matter through the industrial camera, and the acquisition frequency of the industrial camera is synchronous with the printing frequency of the printed matter.

8. The print quality detection apparatus according to claim 6, further comprising:

the alarm module is used for triggering an alarm signal when the N printed matters to be detected which are continuously numbered are detected to have printing defects; wherein the content of the first and second substances,

n is an integer and is not less than 3;

and when at least one item of pattern information of the to-be-detected printed matter is detected to be not in accordance with the standard of the detection parameter, marking as a printing defect.

9. A data processing apparatus, characterized by comprising:

a processor coupled to a memory, the memory storing a program for execution by the processor to cause the data processing apparatus to perform the print quality detection method of any of claims 1 to 5.

10. A computer storage medium storing computer instructions for executing the print quality detection method according to any one of claims 1 to 5.

Background

With the continuous development of printing technology, the quality requirements of people on printed matters are more and more strict, so that the quality detection of the printed matters becomes a necessary and critical step in the printing process.

At present, the quality problems frequently occurring in the printing process comprise ink flying, knife silk, plate pasting, misregistration and the like, the existing quality detection mode mainly comprises the steps of visual inspection and sampling detection by technical personnel, in addition, a large number of quality inspection personnel are required for rechecking printed finished products, the efficiency of the detection mode is low, the production cost is high, errors easily occur in manual detection standards, and the printing quality is easily uneven.

Disclosure of Invention

In view of the above technical problems, the present invention provides a method, an apparatus, a device and a computer medium for detecting print quality, which can accurately detect and judge whether a printed matter has a print defect, and effectively avoid the problems of missing detection and judgment errors caused by manual detection.

In a first aspect, the present invention provides a method for detecting print quality, comprising:

setting detection parameters of a standard printed matter, wherein the detection parameters comprise pattern information, a detection area and detection precision; numbering the presswork to be detected, and carrying out comparative analysis on the pattern information of the detection area of the presswork to be detected according to the detection parameters; the pattern information comprises pattern contour line width, pattern area, pattern color and luster and pattern definition; and outputting a printing quality detection list.

Optionally, before the printing quality detection list is output, when a printing defect is detected in N to-be-detected printed matters with continuous numbers, an alarm signal is triggered; wherein N is an integer and is not less than 3; and when at least one item of pattern information of the to-be-detected printed matter is detected to be not in accordance with the standard of the detection parameter, marking as a printing defect.

Optionally, when the printed matter to be detected has a print defect, recording the detection time, the defect type and the position information of the print defect, and storing the detection time, the defect type and the position information into the print quality detection list.

Optionally, the image of the to-be-detected printed matter is acquired by an industrial camera, and the acquisition frequency of the industrial camera is synchronous with the printing frequency of the printed matter.

Optionally, the detection precision is set for each detection area of the standard printed matter according to the detection requirement of the printed matter.

In a second aspect, the present invention provides a printing quality detection apparatus comprising:

the device comprises a setting module, a detection module and a processing module, wherein the setting module is used for setting detection parameters of a standard printed matter, and the detection parameters comprise pattern information, a detection area and detection precision;

the detection module is used for numbering the presswork to be detected and carrying out comparison analysis on the pattern information of the detection area of the presswork to be detected according to the detection parameters; wherein the content of the first and second substances,

the pattern information comprises pattern contour line width, pattern area, pattern color and luster and pattern definition;

and the output module is used for outputting the printing quality detection list.

Optionally, the printing quality detection device further includes an acquisition module, the acquisition module is configured to acquire an image of the to-be-detected printed matter through an industrial camera, and an acquisition frequency of the industrial camera is synchronous with a printing frequency of the printed matter.

Optionally, the printing quality detection apparatus further includes an alarm module, where the alarm module is configured to trigger an alarm signal when the N to-be-detected printed matters with consecutive numbers are detected to have a printing defect; wherein N is an integer and is not less than 3; and when at least one item of pattern information of the to-be-detected printed matter is detected to be not in accordance with the standard of the detection parameter, marking as a printing defect.

In a third aspect, the present invention provides a data processing apparatus comprising a processor, the processor being coupled to a memory, the memory storing a program, the program being executable by the processor to cause the data processing apparatus to perform the print quality detection method of the first aspect.

In a fourth aspect, the present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the print quality detection method according to the first aspect.

Compared with the prior art, the invention has the beneficial effects that:

the invention continuously shoots the pattern information of the to-be-detected presswork by using the industrial camera, compares the pattern information with the standard presswork, and automatically judges that the printing defect exists when the difference between the pattern information and the standard presswork exceeds the standard range, thereby avoiding the problems of missing detection and judgment error caused by manual detection, effectively reducing the printing rejection rate and improving the product quality.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic flow chart of a method for detecting quality of printed matter according to an embodiment of the present invention;

fig. 2 is a block diagram showing a configuration of a print quality detection apparatus according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.

It should be understood that the step numbers used herein are for convenience of description only and are not used as limitations on the order in which the steps are performed.

It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.

In a first aspect, as shown in fig. 1, an embodiment of the present invention provides a method for detecting the quality of a printed matter, including the following steps.

S11: and setting detection parameters of the standard printed matter, wherein the detection parameters comprise pattern information, a detection area and detection precision.

Specifically, a target detection area of the standard printed matter can be correspondingly set according to the detection requirement of the printed matter, and the unselected area is shielded for detection; and detection precision can be set for different detection areas of the standard printed matter respectively, so that personalized quality detection is realized.

Regarding the detection precision, in this embodiment, when the single-channel color difference of the printed matter is greater than or equal to 10, the detection precision of the printed dots of the standard printed matter can be set to be (0.2 × 0.2) mm, and the detection precision of the lines can be set to be (0.2 × 5) mm.

Specifically, the detection parameters of the standard presswork further comprise the circumference of the printing plate, the paper width and the edge distance, wherein the setting range of the circumference of the printing plate is 1mm-2000mm, the setting range of the paper width is 1mm-1200mm, the edge distance refers to the left and right boundaries of the presswork to be detected, and the accuracy of the detected area of the presswork is directly influenced by the setting of the edge distance.

In the printing process, firstly, the image of the to-be-detected presswork is acquired through the industrial camera, the acquisition frequency of the industrial camera is synchronous with the printing frequency of the presswork (the standard printing speed of the presswork in the embodiment can be set to be 100m/min), each presswork can be detected, and the condition of missing detection is avoided.

In this embodiment, a high-frequency lighting device may be used to provide a light source for the industrial camera, so that the industrial camera tracks and continuously shoots image information of the to-be-detected printed matter, specifically, two linear array CCD cameras may be used to collect images of the printed matter, and the size specification of the collected to-be-detected printed matter is consistent with that of the standard printed matter, so as to ensure high accuracy of the quality detection result.

S12: numbering the presswork to be detected, and comparing and analyzing pattern information of a detection area of the presswork to be detected according to detection parameters of the standard presswork; the pattern information comprises the width of a pattern contour line, the area of the pattern, the color of the pattern and the definition of the pattern.

Specifically, when N printed matters to be detected which are continuously numbered are detected to be printed with printing defects, an alarm signal is triggered; wherein N is an integer and is not less than 3; and when at least one item of pattern information of the to-be-detected printed matter is detected to be not in accordance with the standard of the detection parameters of the standard printed matter, marking as a printing defect.

In this embodiment, if it is detected that there is a print defect in the current printed matter, an early warning notification is triggered, and the defect information is automatically recorded in a print quality detection list; if the N presswork have printing defects continuously, besides automatically recording defect information, synchronously triggering an alarm signal to prompt technicians to adjust the printing process in time so as to reduce the rejection rate of subsequent printing and avoid greater loss.

It can be understood that when the range of the printing points in the pattern of the to-be-detected printed matter is larger than the printing point detection precision of the standard printed matter, the to-be-detected printed matter is indicated to have point defects; when the pattern contour line width of the to-be-detected printed matter is larger than the printing line detection precision of the standard printed matter, indicating that the to-be-detected printed matter has a linear defect; and when the overlapping deviation of the pattern contour of the to-be-detected printed matter and the pattern contour of the standard printed matter is more than 0.2mm, indicating that the to-be-detected printed matter has overprint errors.

When the printed matter to be detected has detected printing defect, the detection time, defect type and position information of the printing defect are automatically recorded and stored in the printing quality detection list.

It is understood that each print defect entry in the print quality inspection list includes the following items: number of prints, position information, defect type, area (mm2), and inspection time. The position information refers to the specific position of the printing defect in the printed matter image, the detection time refers to the system time for detecting the occurrence of the printing defect, and the printed matter number is used for technicians to quickly position the specific position of the printed matter with the printing defect so as to be extracted in time, thereby effectively preventing waste products from flowing into the market and improving the product quality satisfaction of customers.

S13: and outputting a printing quality detection list.

Specifically, the image information of the printed matter corresponding to the printing defect is also stored in the printed matter quality detection list, and when any printing defect record is selected in the quality detection list, the image of the printed matter is synchronously displayed, and the position information of the defect in printing is highlighted, so that a technician can accurately position the printing defect.

According to the embodiment of the invention, the printing repeatability principle is utilized, in the printing process, the image information of the to-be-detected printed matter is continuously shot through the high-speed camera, the to-be-detected printed matter is compared with the set standard printed matter, when the image-text difference of the to-be-detected printed matter and the standard printed matter exceeds the range set by the standard printed matter detection parameter, the printed matter is judged to have the printing defect, and the defect information is synchronously stored in the printing quality detection list, so that technical personnel can timely process the printed matter with the printing defect according to the printed matter quality detection list, and the yield of the printed matter is improved.

In a second aspect, an embodiment of the present invention provides a printing quality detection apparatus, including a setting module 101, a detection module 102, and an output module 103.

The setting module 101 is configured to set detection parameters of a standard printed product, where the detection parameters include pattern information, a detection area, and detection accuracy.

The detection module 102 is configured to number a to-be-detected printed matter and perform comparative analysis on pattern information of a detection area of the to-be-detected printed matter according to the detection parameters; the pattern information comprises the width of a pattern contour line, the area of the pattern, the color of the pattern and the definition of the pattern.

The output module 103 is configured to output a print quality detection list.

In this embodiment, the printing quality detection apparatus further includes an acquisition module 104, which is configured to acquire an image of the to-be-detected printed matter by an industrial camera, wherein an acquisition frequency of the industrial camera is synchronized with a printing frequency of the printed matter.

In one embodiment, the printing quality detection apparatus further includes an alarm module 105, where the alarm module 105 is configured to trigger an alarm signal when the N printed matters to be detected with consecutive numbers are detected to have a printing defect; wherein N is an integer and is not less than 3; when at least one item of pattern information of the printed matter to be detected is detected to be not in accordance with the standard of the detection parameters, the printed matter is marked as a printing defect.

Because the content of information interaction, execution process, and the like among the modules in the device is based on the same concept as the method embodiment of the present invention, specific content can be referred to the description in the method embodiment of the present invention, and is not described herein again.

The above-described embodiments of the apparatus are merely illustrative, and the modules described as separate components may or may not be physically separate, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the units can be selected according to actual needs to achieve the purpose of the method of the embodiment.

In a third aspect, the present invention provides a data processing apparatus comprising a processor, the processor being coupled to a memory, the memory storing a program, the program being executable by the processor to cause the data processing apparatus to perform the print quality detection method of the first aspect.

In a fourth aspect, the present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the print quality detection method according to the first aspect.

It will be understood by those skilled in the art that all or part of the processes of the methods of the above embodiments may be implemented by a computer program, which may be stored in a computer-readable storage medium, and may include the processes of the embodiments of the methods when executed. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.