CN116051490B - Document print quality detection method, printing device, electronic device, and storage medium - Google Patents
Document print quality detection method, printing device, electronic device, and storage medium Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1202—Dedicated interfaces to print systems specifically adapted to achieve a particular effect
- G06F3/1203—Improving or facilitating administration, e.g. print management
- G06F3/1208—Improving or facilitating administration, e.g. print management resulting in improved quality of the output result, e.g. print layout, colours, workflows, print preview
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1223—Dedicated interfaces to print systems specifically adapted to use a particular technique
- G06F3/1237—Print job management
- G06F3/1259—Print job monitoring, e.g. job status
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/90—Determination of colour characteristics
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30108—Industrial image inspection
- G06T2207/30144—Printing quality
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Abstract
The application discloses a document printing quality detection method, a printing device, electronic equipment and a storage medium, which are used for detecting the printing quality of a text document. According to the method and the device, the gray scales of the printed document file images are compared, and whether the same characters have different gray scales in the document printing process is judged by extracting the gray scale values of part of detection points, so that whether the whole printed document has the problems of uneven printing, insufficient toner and the like is judged, the printing quality is improved, and the printer is ensured to diagnose the printing problems in time.
Description
Technical Field
The invention belongs to the technical field of printing equipment, and particularly relates to a document printing quality detection method, a printing device, electronic equipment and a storage medium.
Background
In the existing printer, the document is printed as the main printing content, and in the process of printing a large amount of tasks, the printer often causes unstable printing quality due to ink deficiency, heating and the like, and referring to fig. 1, the conditions of uneven color depth, bright and dark stripes and the like of printed characters on one printed document may be caused. For some industries with high-resolution printing requirements, even if the printer does not have obvious uneven printing, the use effect of the printer is greatly affected if the printer has printing stripes and the like. The existing printer does not have a corresponding print quality detection method, and for large-scale print jobs, the print quality is generally judged only by a manual checking mode after printing is completed. Although individual printers prompt the toner stock through toner chip counting and the like, the current chip printing counting mode can not detect the printing quality at all, and timely feedback after the printing quality of the printer is reduced can not be realized.
Disclosure of Invention
In order to solve the above problems, the present application provides a document print quality detection method, a printing apparatus, an electronic device, and a storage medium, which realize detection of print quality by detecting the gradation of a printed document by a printer.
The technical proposal comprises: a document print quality detection method is used for detecting the print quality of a text document, and the print quality is judged by adding an image acquisition module to a printer, acquiring a plurality of detection point images of the document printed by the printer by the image acquisition module, and comparing the gray values of detection points; the detecting point generating step of the method comprises the following steps: the detection point generation step includes: the printer receives a document to be printed; extracting characteristic information of the document to be printed by the printer; the printer generates a first check grid according to the characteristic information of the document to be printed; the printer extracts the occurrence frequency of repeated characters in the document to be printed, and selects a group of repeated characters as detection calibration characters according to the occurrence frequency of the repeated characters and the character positions; corresponding the characters of the document to be printed to rectangular lattices of the first check grid, wherein the lattices corresponding to the characters in the same character format are consistent in size; taking the grids where all the detection calibration characters are located as detection points;
the print quality judging step includes: the printer prints the document to be printed into a document to be detected; the image acquisition module acquires a document image to be detected and generates the document image to be detected into a first detection image according to format information of a document to be printed; generating a first grid image by corresponding the first detection image to the first check grid; extracting a corresponding grid sub-image in the first grid image according to the grid position of each detection point in the first detection grid to serve as an image to be detected; extracting the gray average value of each image to be detected, and sorting the images according to the gray average value from large to small; and calculating the maximum value of the gray average value minus the minimum value of the gray average value, judging whether the structure is in the normal threshold range, if so, judging that the printing quality is qualified, and if not, judging that the printing quality is unqualified.
A printing apparatus detects document print quality using the above-described document print quality detection method.
An electronic device, the electronic device comprising: a memory for storing processor-executable instructions; a processor configured to execute the executable instructions in the memory to implement the steps of the above method.
A storage medium having stored thereon a computer program which when executed by a processor performs the steps of the method described above.
According to the method and the device, the gray scales of the printed document file images are compared, and whether the same characters have different gray scales in the document printing process is judged by extracting the gray scale values of part of detection points, so that whether the whole printed document has the problems of uneven printing, insufficient toner and the like is judged, the printing quality is improved, and the printer is ensured to diagnose the printing problems in time.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a printed document with print stripes in a conventional printer;
FIG. 2 is a schematic flow chart of one embodiment of the method of the present application;
FIG. 3 is a schematic diagram of one embodiment of a first check grid in the method of the present application;
FIG. 4 is a schematic diagram of one embodiment of a first grid image in the method of the present application;
FIG. 5 is a schematic diagram of an embodiment of a position of an image to be detected in the method of the present application;
FIG. 6 is a schematic diagram of one embodiment of another first inspection grid in the method of the present application.
Detailed Description
The following description of the embodiments of the present application will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 2, a method for detecting printing quality of a document is used for detecting printing quality of a text document, an image acquisition module is added to a printer, a plurality of detection point images of the document printed by the printer are acquired by the image acquisition module, and gray values of detection points are compared to judge the printing quality; the detection point generation step includes: the printer receives a document to be printed; extracting characteristic information of the document to be printed by the printer; the printer generates a first check grid according to the characteristic information of the document to be printed, and corresponds the characters of the document to be printed to rectangular grids, wherein the grids corresponding to the characters in the same character format are consistent in size; the printer extracts the frequency of occurrence of repeated characters and the positions of character grids in the document to be printed, and selects a group of repeated characters as detection calibration characters according to the frequency of occurrence of the repeated characters and the positions of the character grids; taking the grids where all the detection calibration characters are located as detection points; the print quality judging step includes: the printer prints the document to be printed into a document to be detected; the image acquisition module acquires a document image to be detected and generates the document image to be detected into a first detection image according to format information of a document to be printed; generating a first grid image by corresponding the first detection image to the first check grid; extracting a corresponding grid sub-image in the first grid image according to the grid position of each detection point in the first detection grid to serve as an image to be detected; extracting the gray average value of each image to be detected, and sorting the images according to the gray average value from large to small; and calculating the maximum value of the gray average value minus the minimum value of the gray average value, judging whether the structure is in the normal threshold range, if so, judging that the printing quality is qualified, and if not, judging that the printing quality is unqualified.
In this embodiment, the image acquisition module preferentially selects the scanner installed at the print output position of the printer, so that the printed document can be scanned in the print output process, external interference is avoided, and meanwhile, scanning time is saved. The method aims at the situation that slight change of printing quality caused by insufficient toner or other problems in the printing process is not easy to perceive and cannot meet the printing requirement of high-quality documents. When the color depth of the characters printed on the same paper is wrong, the printing problem can be effectively and self-detected in the mode of the printing device, and the printing is interrupted in time to send out fault alarm. In connection with fig. 3 and 4, the relationship of the first inspection grid to the first grid image is in the printing process using the present application. Referring to fig. 3, in the present application, in order to reduce the image acquisition amount and the image gray conversion operation amount, according to the document format, such as text paragraphs, spaces, etc., the grid format preferably adopts a grid matching with the text size, so as to reduce the area of the detection point and the image to be detected in the later stage, and reduce the calculation amount. Referring to fig. 4, after the characters are matched with the grid, the grid coordinates and the grid area corresponding to each character can be further determined through the grid positions. In the application, for convenience in representation, each punctuation is limited to a character form, in the process of generating grids by a printer, in order to avoid punctuation interference, the grids are not necessarily strictly arranged in horizontal or vertical rows, so long as the grids can be identified in two-dimensional coordinates, and the grids of the grids can be wrapped outside fonts. In addition, the grids of the application can also adopt the form of full-page grids and partial grids, fig. 3 and 4 are the form of full-page grids, after the detection calibration characters are selected as the characters of the text in fig. 5 (for convenience of representation, the characters are thickened in fig. 5), the grids where the characters are positioned are images to be detected, when the documents to be printed are printed into the documents to be detected, the printer converts the images to be detected into first detection images according to the parameters of document format parameters, such as the size of printed paper of the documents, the size of fonts, the margin, the header, the footer and the like, and combines the first detection grids to convert the images to be detected into the first detection images, extracts the images to be detected at the two-dimensional position of the first detection image documents according to the grids where the characters are positioned, and then calculates whether the quality of the documents printed by the printer is stable and consistent according to the gray level tie value of the images to be detected. The utility model discloses a rectangle check is adopted, and the convenience is in the picture acquisition to the degree of accuracy of rectangle area cutting, and the rectangle check is applicable to most general characters, like chinese, english, german, french etc. and the rectangle check when calculating the gray, can conveniently utilize the two-dimensional matrix of gray value to carry out statistics and calculate the mean value, improves the operating efficiency.
The partial grid form is that after the detection calibration characters are selected, corresponding rows and corresponding columns of grids are generated according to the arrangement positions of the detection calibration characters in the document to be printed, as shown in fig. 6, the first inspection grid adopting the mode of fig. 6 does not need to grid the whole document to be printed, only needs to purposefully grid partial rows and/or columns according to the positions of the detection calibration characters in the two-dimensional coordinate system of the document to be printed, and the requirement of the application on the calculation amount is further reduced. The later gray value solving process adopting the partial grid form is consistent with the whole grid form, and only the image of the grid where the detection calibration characters are is positioned is extracted and gray is calculated.
In the application, the grid is adopted to determine the detection area and ensure that the same printing content is necessarily available in the detection area, and the first detection grid at least needs one row and one column of grids to completely correspond to the size of the printing paper according to the printing format in the generation process, so that the later positioning of the first detection image and the extraction accuracy of the image to be detected are facilitated.
On the basis of the above embodiment, the normal threshold range acquisition step includes: and obtaining the preset printing contrast and printing color of the printer, generating background gray according to the printing contrast, generating printing gray according to the printing color, and taking 0.1 time of the difference value between the printing gray and the background gray as the maximum normal threshold range. In this embodiment, after multiple experiments, printing and scanning or shooting of a document image, a reasonable range in which the maximum normal threshold range is 0.1 time of the difference between the printing gray scale and the background gray scale is more accurate and false alarm is avoided.
On the basis of the one or more embodiments, the generating a first grid image by associating the first detection image with the first inspection grid further includes obtaining size and text direction information of the first detection image, and overlapping the size and text direction of the first inspection grid corresponding to the first detection image. In this embodiment, the width and length of the first detection image are corresponding to at least one row and one column of lattices, so as to position the first detection image, and then the first detection image and the first inspection grid are further overlapped.
On the basis of the one or more embodiments, the detecting calibration text selection step further includes: dividing the first inspection grid into a plurality of rows from top to bottom according to the character direction, and selecting a group of characters which are uniformly distributed from top to bottom and have the repetition times exceeding five times as detection calibration characters. In this embodiment, in order to improve the detection accuracy, characters with a plurality of repetition times and discrete distribution are selected as possible as detection calibration characters, so that the detection of the whole document range is achieved, and the detection is prevented from being missed in a certain area.
On the basis of one or more embodiments, the feature information of the document to be printed further includes a paper size, a text number, a text format, and a document format of the document to be printed.
On the basis of one or more embodiments, in this embodiment, further, when the print quality is not acceptable, the printer performs a toner detection step, including: the printer prints a test document comprising at least four color text and at least one set of repeatedly arranged text for each primary color, the font of each color text being different from the font formats of the other colors, and detects the toner balance for each primary color by detecting the text print quality for each primary color. In this embodiment, in order to further assist in diagnosing the failure source of the printer, the four primary color printing method is adopted to determine whether the failure occurs in the toner or the toner supply portion, so that the printing failure can be removed conveniently and rapidly.
On the basis of the one or more embodiments, in this embodiment, further, the repeated characters of each primary color are arranged in a dispersed manner.
A printing apparatus detects document print quality using the document print quality detection method of any of the above embodiments.
An electronic device, the electronic device comprising: a memory for storing processor-executable instructions; a processor configured to execute the executable instructions in the memory to implement the steps of the document print quality detection method in any one of the embodiments described above. .
A storage medium having a computer program stored thereon, wherein the program when executed by a processor performs the steps of any one of the embodiments of the method for detecting print quality in a document described above.
According to the method and the device, the gray scales of the printed document file images are compared, and whether the same characters have different gray scales in the document printing process is judged by extracting the gray scale values of part of detection points, so that whether the whole printed document has the problems of uneven printing, insufficient toner and the like is judged, the printing quality is improved, and the printer is ensured to diagnose the printing problems in time.
The scope of the present invention is not limited thereto, and any changes or substitutions of technical solutions that can be conceived without inventive labor should be covered by the scope of the present invention. The protection scope of the present invention is defined by the claims.
Claims (8)
1. A document print quality detection method is used for detecting the print quality of a text document and is characterized in that an image acquisition module is additionally arranged on a printer, a plurality of detection point images of the document printed by the printer are acquired by the image acquisition module, and gray values of detection points are compared to judge the print quality;
the detection point generation step includes:
the printer receives a document to be printed;
extracting characteristic information of the document to be printed by the printer;
the printer generates a first check grid according to the characteristic information of the document to be printed;
the printer extracts the occurrence frequency of repeated characters in the document to be printed, and selects a group of repeated characters as detection calibration characters according to the occurrence frequency of the repeated characters and the character positions;
corresponding the characters of the document to be printed to rectangular lattices of the first check grid, wherein the lattices corresponding to the characters in the same character format are consistent in size;
taking the grids where all the detection calibration characters are located as detection points;
the print quality judging step includes:
the printer prints the document to be printed into a document to be detected;
the image acquisition module acquires a document image to be detected and generates the document image to be detected into a first detection image according to format information of a document to be printed;
generating a first grid image by corresponding the first detection image to the first check grid;
extracting a corresponding grid sub-image in the first grid image according to the grid position of each detection point in the first detection grid to serve as an image to be detected;
extracting the gray average value of each image to be detected, and sorting the images according to the gray average value from large to small;
calculating the maximum value of the gray average value minus the minimum value of the gray average value, judging whether the structure is in the normal threshold range, if so, judging that the printing quality is qualified, and if not, judging that the printing quality is unqualified;
the process of generating the first grid image by corresponding the first detection image and the first detection grid comprises the steps of acquiring the size and character direction information of the first detection image, and overlapping the size and character direction of the first detection image corresponding to the first detection grid;
when the printing quality is unqualified, the printer performs a toner detection step including: the printer prints a test document comprising at least four color text and at least one set of repeatedly arranged text for each primary color, the font of each color text being different from the font formats of the other colors, and detects the toner balance for each primary color by detecting the text print quality for each primary color.
2. The document print quality detection method according to claim 1, wherein the normal threshold range acquisition step includes:
and obtaining the preset printing contrast and printing color of the printer, generating background gray according to the printing contrast, generating printing gray according to the printing color, and taking 0.1 time of the difference value between the printing gray and the background gray as the maximum normal threshold range.
3. The document print quality detection method according to claim 1, wherein the detection calibration text selection step includes: dividing the first inspection grid into a plurality of rows from top to bottom according to the character direction, and selecting a group of characters which are uniformly distributed from top to bottom and have the repetition times exceeding five times as detection calibration characters.
4. The document print quality detection method according to claim 1, wherein the characteristic information of the document to be printed includes a paper size, a number of characters, a character format, and a document format of the document to be printed.
5. The method for detecting the print quality of a document according to claim 1, wherein the repeated text of each primary color is arranged in a dispersed manner.
6. A printing apparatus, wherein the document print quality is detected by the document print quality detection method according to any one of claims 1 to 5.
7. An electronic device, the electronic device comprising: a memory for storing processor-executable instructions; a processor configured to execute executable instructions in the memory to implement the steps of the method of any one of claims 1 to 5.
8. A storage medium having stored thereon a computer program, which when executed by a processor performs the steps of the method according to any of claims 1 to 5.
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