CN111046758A - Method and system for tracing and comparing printed secret marks - Google Patents
Method and system for tracing and comparing printed secret marks Download PDFInfo
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- CN111046758A CN111046758A CN201911184303.2A CN201911184303A CN111046758A CN 111046758 A CN111046758 A CN 111046758A CN 201911184303 A CN201911184303 A CN 201911184303A CN 111046758 A CN111046758 A CN 111046758A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
- G06V30/40—Document-oriented image-based pattern recognition
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F18/00—Pattern recognition
- G06F18/20—Analysing
- G06F18/22—Matching criteria, e.g. proximity measures
Abstract
The invention relates to a method and a system for tracing and comparing a printed secret mark, and relates to the technical field of computers and image processing. The method comprises the following steps: acquiring a scanned image of a file to be compared; determining a dark mark region of the scanned image; extracting the secret mark data of the scanning file in the secret mark area; comparing the secret mark data with a plurality of printer secret mark marks in a secret mark database, and determining a comparison result corresponding to the secret mark data, wherein the secret mark database comprises a plurality of printer secret mark marks, the comparison result comprises a plurality of pieces of data, and each piece of data comprises the secret mark data, the printer secret mark and a similarity value between the secret mark data and the printer secret mark; and outputting the comparison result. By the method and the system, the efficiency of tracing and comparing the printed secret marks is improved.
Description
Technical Field
The invention relates to the technical field of computers and image processing, in particular to a method and a system for tracing and comparing a printed secret mark.
Background
At present, most color laser printers have tiny yellow secret marks arranged according to a special rule on a printing page, the secret marks can be used as characteristics for tracing the source of a printed document, and the characteristics of the secret marks can be used for assisting other works, such as a document tracing user and the like.
The method is characterized in that the method comprises the following steps of comparing a plurality of types of the hidden marks, and comparing the types of the hidden marks with the types of the hidden marks.
Therefore, a method for tracking and comparing secret marks is needed to solve the above technical problems.
Disclosure of Invention
In view of the above, the present invention is directed to overcome the deficiencies of the prior art, and provides a method and a system for tracing and comparing a printed secret mark, which are used to improve the efficiency of tracing and comparing the printed secret mark.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for tracing and comparing printed secret marks comprises the following steps:
acquiring a scanned image of a file to be compared;
determining a dark mark region of the scanned image;
extracting the secret mark data of the scanning file in the secret mark area;
comparing the secret mark data with a plurality of printer secret mark marks in a secret mark database, and determining a comparison result corresponding to the secret mark data, wherein the secret mark database comprises a plurality of printer secret mark marks, the comparison result comprises a plurality of pieces of data, and each piece of data comprises the secret mark data, the printer secret mark and a similarity value between the secret mark data and the printer secret mark;
and outputting the comparison result.
Optionally, the determining the dark mark area of the scanned image specifically includes:
displaying the scanned image on a display screen;
and acquiring the area selected by the user on the display screen.
Optionally, the extracting the secret mark data of the scan file located in the secret mark area specifically includes:
extracting the dark mark image of the scanning file in the dark mark area
And preprocessing, denoising, enhancing and/or segmenting the dark mark image.
Optionally, after the extracting the dark mark image of which the scan file is located in the dark mark area, the method further includes:
displaying the secret mark image on the display screen, and acquiring the determination information of the user on the secret mark image;
when the determination information indicates that the secret mark image is inaccurate, the secret mark image is acquired again.
Optionally, after the comparing the secret mark data with data in a secret mark database and determining a comparison result corresponding to the secret mark data, the method further includes:
displaying the comparison result on the display screen for the user to perform manual verification;
acquiring manual verification information of the user;
and when the manual verification information shows that the comparison result is not right, re-determining the comparison result.
Optionally, the displaying the comparison result on the display screen specifically includes:
and displaying the secret mark data in the comparison result and printer secret mark marks in the secret mark database side by side, wherein each row comprises the secret mark data and one printer secret mark, and the secret mark data and the printer secret mark marks are displayed in equal proportion.
Optionally, the outputting the comparison result specifically includes:
generating an analysis report corresponding to the comparison result according to a specific template;
and outputting the analysis report.
Optionally, the analysis report includes a plurality of printer hidden mark numbers with similarity greater than a preset threshold, and the printer hidden mark numbers are sorted according to the similarity.
Optionally, the secret mark area is a rectangular area, and there is no interference point in the rectangular area.
A print-secret tracking comparison system, comprising:
the scanning image acquisition module is used for acquiring a scanning image of a file to be compared;
a secret mark area determination module for determining a secret mark area of the scanned image;
the secret mark data extraction module is used for extracting the secret mark data of the scanning file in the secret mark area;
the data comparison module is used for comparing the secret mark data with a plurality of printer secret mark marks in a secret mark database and determining a comparison result corresponding to the secret mark data, wherein the comparison result comprises a plurality of pieces of data, and each piece of data comprises the secret mark data, the printer secret mark and the similarity value between the secret mark data and the printer secret mark;
and the comparison result output module is used for outputting the comparison result. .
The method comprises the steps of obtaining a scanned image of a file to be compared; determining a dark mark region of the scanned image; extracting the secret mark data of the scanning file in the secret mark area; comparing the secret mark data with a plurality of printer secret mark marks in a secret mark database, and determining a comparison result corresponding to the secret mark data, wherein the secret mark database comprises a plurality of printer secret mark marks, the comparison result comprises a plurality of pieces of data, and each piece of data comprises the secret mark data, the printer secret mark and a similarity value between the secret mark data and the printer secret mark; and outputting the comparison result. By the method and the system, the efficiency of tracing and comparing the printed secret marks is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for tracing and comparing printed secret marks according to the present invention;
fig. 2 is a schematic structural diagram of a printing secret mark tracking and comparing device according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Fig. 1 is a schematic flowchart of a method for tracking a printed secret mark according to an embodiment of the present disclosure. From the viewpoint of a program, the execution subject of the flow may be a program installed in an application server or an application client.
As shown in fig. 1, the process may include the following steps:
step 101: and acquiring a scanned image of the file to be compared.
In the embodiment of the present specification, if a user wants to determine that a document to be compared is printed by a type printer, the document to be compared needs to be scanned first, and if the document to be compared is a plurality of pages, the plurality of pages of the document can be scanned respectively to obtain a plurality of scanned images. The following operations may be performed for each scanned image one by one, and then a majority of the obtained comparison results may be determined as the printer type of the document to be compared.
In addition, the scanned image is preferably selected to be a high-definition image so as not to affect the comparison effect. For example, the scanned image may be an image generated by scanning an a4 paper document with a high definition scanner.
Step 102: determining a dark mark region of the scanned image.
In the illustrated embodiment, the dark notes of different printers may be in different positions, several common dark note areas may be preset as an alternative, and the dark note areas may be automatically selected according to the type of the scanned image, such as the upper left corner, the upper right corner, and the like of the scanned image. In addition, the secret mark region may be provided as a rectangular region,
if the format of the scanned image is not standard, a function of selecting an area can be provided for a user, a rectangular area is manually drawn on the image by the user, a proper secret mark area is manually selected, and in addition, interference points cannot exist in the selected area as far as possible so as to avoid influencing the extraction of the secret mark data. Therefore, the determining the dark mark area of the scanned image may specifically include:
displaying the scanned image on a display screen;
and acquiring the area selected by the user on the display screen.
After the user selects the secret mark area, the user can finish the selection of the secret mark area by clicking a 'confirmation key' on the display screen. After the user-defined set secret mark area is obtained, the user can confirm the secret mark area again, misoperation is reduced, and the accuracy of secret mark area selection is submitted.
In addition, when the hidden mark area is selected or customized by the user, the shape is not too large or too small, and is adjusted according to the size of the hidden mark image.
Step 103: and extracting the secret mark data of the scanning file in the secret mark area.
In an embodiment of this specification, the extracting the secret mark data of the scan file located in the secret mark area specifically may include:
extracting a secret mark image of the scanning file in the secret mark area;
and preprocessing, denoising, enhancing and/or segmenting the dark mark image.
The extraction of the dark image is first carried out on the basis of the dark area, which can be understood as the image in which the scan document is located. After the dark mark image is obtained, in order to reduce the influence of the environment such as light, the dark mark image may be preprocessed, denoised, enhanced and/or segmented, and then the dark mark data is obtained. The secret mark data can be images and can also be character strings for comparison convenience, so that data progress storage is facilitated.
In addition, in order to improve the accuracy, after the extracting the dark mark image of which the scan file is located in the dark mark area, the method further includes:
displaying the secret mark image on the display screen, and acquiring the determination information of the user on the secret mark image;
when the determination information indicates that the secret mark image is inaccurate, the secret mark image is acquired again.
The technical characteristics can be understood that the file scanning image is displayed on the display screen, the extracted secret mark image is also displayed on the display screen and is synchronously displayed with the scanning image, and a user can perform manual verification to judge whether the secret mark extraction method is accurate or not. After the dark mark image is extracted, if the size of the dark mark image is too large or too small, the user can adjust the image when the printer cannot really mark the printing mark. This is an additional measure that increases the interaction with the user and may also improve the accuracy of the extraction of the secret data.
Step 104: comparing the secret mark data with a plurality of printer secret mark marks in a secret mark database, and determining a comparison result corresponding to the secret mark data, wherein the secret mark database comprises a plurality of printer secret mark marks, the comparison result comprises a plurality of data, and each piece of data comprises the secret mark data, the printer secret mark and a similarity value of the secret mark data and the printer secret mark.
In the embodiment of the present specification, a plurality of printer's hidden marks are stored in the hidden mark database, and these hidden marks can determine which type of printer has printed. These printer-cryptic marks may be stored in the form of character strings.
Therefore, the secret mark data can be compared with a plurality of printer secret mark marks in the secret mark database one by one, the similarity between the secret mark data and each printer secret mark is calculated, and finally the comparison results are returned according to the sequence of the similarity. The alignment results may be in the form of a list.
In order to improve the checking precision and avoid the problem of the program, the method further comprises the following steps:
displaying the comparison result on the display screen for the user to perform manual verification;
acquiring manual verification information of the user;
and when the manual verification information shows that the comparison result is not right, re-determining the comparison result.
By adopting the technical means, comparison results with obvious errors can be eliminated, a user can select to mark the comparison results with the obvious errors, the background can delete the comparison results according to the operation of the user, or the printer secret mark corresponding to the comparison results is compared with the secret mark data again to obtain correct comparison results.
The embodiment of the present specification further provides a method for facilitating a user to screen a comparison result, where the method is as follows: and displaying the secret mark data in the comparison result and printer secret mark marks in the secret mark database side by side, wherein each row comprises the secret mark data and one printer secret mark, and the secret mark data and the printer secret mark marks are displayed in equal proportion.
Step 105: and outputting the comparison result.
In this embodiment of the present specification, the user is not interested in all comparison results, and only the comparison result with high similarity is valuable, so the outputting the comparison result may specifically include:
generating an analysis report corresponding to the comparison result according to a specific template;
and outputting the analysis report.
The technical characteristics can be understood as follows: the specific template may be a format defined, or a content of an analysis report defined, for example, the analysis report includes a plurality of printer hidden mark with similarity greater than a preset threshold, and the printer hidden mark is sorted according to the similarity. The preset threshold value can be set according to actual conditions, preferably 90%, and if the preset threshold value is too large, the analysis report may have no content, and comparison needs to be performed for many times; if the preset threshold is too small, the content of the analysis report is too much, which wastes resources.
To facilitate the determination of the source of the cryptic data, the printer with the highest similarity may be marked with the top of the analysis report for easy viewing by the user.
In addition, the analysis report may include only the optimal results, match the best matching data by similarity (printer-cryptic flag), and return the optimal results in order.
Meanwhile, the method can also comprise the following steps: and simultaneously displaying the secret mark data and all printer secret marks with higher similarity in the secret mark database on a display screen, and allowing a user to select any printer secret mark and the secret mark image for verification to judge whether the result is accurate.
The method of fig. 1, by obtaining a scanned image of a document to be compared; determining a dark mark region of the scanned image; extracting the secret mark data of the scanning file in the secret mark area; comparing the secret mark data with a plurality of printer secret mark marks in a secret mark database, and determining a comparison result corresponding to the secret mark data, wherein the secret mark database comprises a plurality of printer secret mark marks, the comparison result comprises a plurality of pieces of data, and each piece of data comprises the secret mark data, the printer secret mark and a similarity value between the secret mark data and the printer secret mark; and outputting the comparison result. By the method and the system, the efficiency of tracing and comparing the printed secret marks is improved.
Based on the same idea, the embodiment of the present specification further provides a device corresponding to the above method. Fig. 2 is a schematic structural diagram of a printing secret mark tracking and comparing apparatus corresponding to fig. 1 according to an embodiment of the present disclosure. As shown in fig. 2, the apparatus may include:
a scanned image obtaining module 201, configured to obtain a scanned image of a file to be compared;
a secret mark area determination module 202, configured to determine a secret mark area of the scanned image;
a secret mark data extraction module 203, configured to extract the secret mark data of the scan file located in the secret mark area;
a data comparison module 204, configured to compare the secret mark data with a plurality of printer secret mark tags in a secret mark database, and determine a comparison result corresponding to the secret mark data, where the comparison result includes a plurality of pieces of data, and each piece of data includes the secret mark data, the printer secret mark, and a similarity value between the secret mark data and the printer secret mark;
a comparison result output module 205, configured to output the comparison result.
In one or more embodiments, the secret mark area determination module 202 may be specifically configured to:
displaying the scanned image on a display screen;
and acquiring the area selected by the user on the display screen.
In one or more embodiments, the secret data extracting module 203 may specifically include:
a secret mark image extraction unit, which is used for extracting the secret mark image of the scanning file in the secret mark area;
and the dark mark data processing unit is used for carrying out preprocessing, denoising, enhancing and/or segmentation processing on the dark mark image.
In one or more embodiments, the secret image extracting unit may further include:
the secret mark image display subunit is used for displaying the secret mark image on the display screen and acquiring the determination information of the user on the secret mark image;
a reacquiring subunit configured to reacquire the secret image when the determination information indicates that the secret image is inaccurate.
In one or more embodiments, after the comparing the secret mark data with data in a secret mark database and determining a comparison result corresponding to the secret mark data, the apparatus may further include:
the comparison result display module is used for displaying the comparison result on the display screen for the user to manually verify;
the manual verification information acquisition module is used for acquiring manual verification information of the user;
and the re-determining module is used for re-determining the comparison result when the manual verification information shows that the comparison result is not right.
In one or more embodiments, the comparison result display module may be specifically configured to: and displaying the secret mark data in the comparison result and printer secret mark marks in the secret mark database side by side, wherein each row comprises the secret mark data and one printer secret mark, and the secret mark data and the printer secret mark marks are displayed in equal proportion.
In one or more embodiments, the comparison result output module 205 may specifically include:
generating an analysis report corresponding to the comparison result according to a specific template;
and outputting the analysis report.
In one or more embodiments, the analysis report includes a plurality of printer dark mark labels with similarity greater than a preset threshold with the dark mark data, and the printer dark mark labels are sorted according to the similarity.
In one or more embodiments, the secret mark region is a rectangular region with no interference points within the rectangular region.
The apparatus of fig. 2, by acquiring a scanned image of a document to be compared; determining a dark mark region of the scanned image; extracting the secret mark data of the scanning file in the secret mark area; comparing the secret mark data with a plurality of printer secret mark marks in a secret mark database, and determining a comparison result corresponding to the secret mark data, wherein the secret mark database comprises a plurality of printer secret mark marks, the comparison result comprises a plurality of pieces of data, and each piece of data comprises the secret mark data, the printer secret mark and a similarity value between the secret mark data and the printer secret mark; and outputting the comparison result. By the method and the system, the efficiency of tracing and comparing the printed secret marks is improved.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A method for tracing and comparing printed secret marks is characterized by comprising the following steps:
acquiring a scanned image of a file to be compared;
determining a dark mark region of the scanned image;
extracting the secret mark data of the scanning file in the secret mark area;
comparing the secret mark data with a plurality of printer secret mark marks in a secret mark database, and determining a comparison result corresponding to the secret mark data, wherein the secret mark database comprises a plurality of printer secret mark marks, the comparison result comprises a plurality of pieces of data, and each piece of data comprises the secret mark data, the printer secret mark and a similarity value between the secret mark data and the printer secret mark;
and outputting the comparison result.
2. The method of claim 1, wherein said determining the scout region of the scanned image comprises:
displaying the scanned image on a display screen;
and acquiring the area selected by the user on the display screen.
3. The method according to claim 1, wherein the extracting the dark mark data of the scan file located in the dark mark area comprises:
extracting a secret mark image of the scanning file in the secret mark area;
and preprocessing, denoising, enhancing and/or segmenting the dark mark image.
4. The method of claim 1, wherein after said extracting the vignette image that the scan file is located within the vignette region, the method further comprises:
displaying the secret mark image data on the display screen, and acquiring the determination information of the user on the secret mark image;
when the determination information indicates that the secret mark image is inaccurate, the secret mark image is acquired again.
5. The method of claim 1, wherein after the comparing the secret data to data in a secret database to determine a comparison result corresponding to the secret data, the method further comprises:
displaying the comparison result on the display screen for the user to perform manual verification;
acquiring manual verification information of the user;
and when the manual verification information shows that the comparison result is not right, re-determining the comparison result.
6. The method of claim 5, wherein displaying the comparison result on the display screen specifically comprises:
and displaying the secret mark data in the comparison result and printer secret mark marks in the secret mark database side by side, wherein each row comprises the secret mark data and one printer secret mark, and the secret mark data and the printer secret mark marks are displayed in equal proportion.
7. The method of claim 1, wherein the outputting the comparison result specifically comprises:
generating an analysis report corresponding to the comparison result according to a specific template;
and outputting the analysis report.
8. The method of claim 7, wherein the analysis report includes a plurality of the printer dark mark with a similarity to the dark mark data greater than a preset threshold, the printer dark mark being sorted by a magnitude of the similarity.
9. The method of claim 1, wherein the dark mark region is a rectangular region having no interference points within the rectangular region.
10. A system for tracing and comparing printed secret marks, comprising:
the scanning image acquisition module is used for acquiring a scanning image of a file to be compared;
a secret mark area determination module for determining a secret mark area of the scanned image;
the secret mark data extraction module is used for extracting the secret mark data of the scanning file in the secret mark area;
the data comparison module is used for comparing the secret mark data with a plurality of printer secret mark marks in a secret mark database and determining a comparison result corresponding to the secret mark data, wherein the comparison result comprises a plurality of pieces of data, and each piece of data comprises the secret mark data, the printer secret mark and the similarity value between the secret mark data and the printer secret mark;
and the comparison result output module is used for outputting the comparison result.
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| CN201911184303.2A CN111046758A (en) | 2019-11-27 | 2019-11-27 | Method and system for tracing and comparing printed secret marks |
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