CN107302645B - A kind of image processing apparatus and its image processing method - Google Patents
A kind of image processing apparatus and its image processing method Download PDFInfo
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- CN107302645B CN107302645B CN201710424620.1A CN201710424620A CN107302645B CN 107302645 B CN107302645 B CN 107302645B CN 201710424620 A CN201710424620 A CN 201710424620A CN 107302645 B CN107302645 B CN 107302645B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/44—Secrecy systems
- H04N1/4446—Hiding of documents or document information
Abstract
The present invention provides a kind of image processing apparatus characterized by comprising receiving unit receives original text file data from outside；Recognition unit identifies the character in the original text file data；Embedded unit, by the character recognized according to its attribute information of scheduled rules modification, to generate confidential documents data.The present invention passes through the characters' property information of modification document data, to be embedded in watermark information, to generate the confidential documents data that can be tracked.
Description
[technical field]
The present invention relates to image processing apparatus more particularly to the image processing apparatus and image processing method of secrecy processing.
[background technique]
In the prior art, information is often propagated and is interacted using text as carrier, for including text
Electronic document easily can be replicated and be copied, for the paper document comprising text can by printing, scanning,
The form of duplicating is propagated.For the document of effective protection concerning security matters, the document of concerning security matters is prevented to be illegally accessed or replicate, it will
Certain information with mark action, document structure tree time, the copyright ownership of document, author etc. are hidden in the document of concerning security matters
In, what these secret informations were visually not easy to be found, when document is illegally accessed or is replicated, mentioned by specific device
The source of document can be tracked to have the function that copyright protection and retrospect source by taking the watermark information being hidden in text.
How watermark information to be embedded into text, way in the prior art is installation driving on computers
Additional virtual printer is also installed while program, is not that selection is usual when application program selection document is printed out
The normal printer used, but virtual printer is selected in lists；User can select reality in normal printing
The target printer on border is printed out, printing behaviour all using HOOK technology (also known as Hook Technique) interception system at this time
Make message, forces first for user's content to be printed to be sent to virtual printer, EMF formatted file is obtained, to EMF formatted file
Realistic objective printer output is sent it to again after insertion watermark information.But such mode has a problem that: needs
User additionally installs virtual printer on computers, and user, which needs to manually select virtual printer when printing, can just execute text
The encryption of shelves, even if user is not to manually select virtual printer, computer can also use HOOK technology (also known as hook skill
Art) all printing message of interception system, it forces user's content to be printed being first sent to virtual printer, existing skill
Way in art increases the workload of user, and may have system safety problem, in some instances it may even be possible to lead to computer system
Collapse.
[summary of the invention]
In order to solve the problems in the prior art, the embodiment provides a kind of image processing apparatus, the images
Processing unit independently can carry out secrecy processing to from external received document data insertion watermark information, fill by image procossing
The document data for setting input or output can effectively carry out secrecy processing, without user's addition virtually beating additionally
Print machine intercepts and captures document data to be embedded in watermark information.
To achieve the goals above, on the one hand, the present invention provides a kind of image processing apparatus characterized by comprising
Receiving unit receives original text file data from outside；
Recognition unit identifies the character in the original text file data；
Embedded unit, by the character recognized according to its attribute information of scheduled rules modification, to generate confidential documents
Data.
Preferably, the recognition unit judges the original text file data before identifying the character in the original text file data
Type；The recognition unit is according to the type of the original text file data, according to page-describing feature relevant to the type
To identify the character in the original text file data.
Preferably, the recognition unit is according to the type of the original text file data, according to the page relevant to the type
Expressive Features identify the character in the original text file data, draw according to character corresponding with current page description language type
System order obtains the character in the original text file data.
Preferably, the confidential documents data include watermark information, and the embedded unit passes through to the original text file data
The character of middle predetermined quantity selects part of its attribute information of character change to be embedded in the watermark information.
Preferably, modifying the attribute information includes modification font size, font spacing, font color, line space, rotation
Angle or replacement character library.
On the other hand, the present invention also provides a kind of image processing methods suitable for image processing apparatus, which is characterized in that
The described method includes:
Original text file data is received from outside；
Identify the character in the original text file data；
By the character recognized according to its attribute information of scheduled rules modification, to generate confidential documents data.
Preferably, before identifying the character in the original text file data, judge the type of the original text file data；According to institute
The type for stating original text file data identifies the word in the original text file data according to page-describing feature relevant to the type
Symbol.
Preferably, according to the type of the original text file data, know according to page-describing feature relevant to the type
Character in the not described original text file data obtains institute according to character rendering order corresponding with current page description language type
State the character in original text file data.
Preferably, the confidential documents data include watermark information, by predetermined quantity in the original text file data
Character selects part of its attribute information of character change to be embedded in the watermark information.
Preferably, the modification attribute information includes modifying the font size of character, font spacing, font color, in the ranks
Away from, rotation angle or replacement character library.
Using in above-mentioned technical proposal provided by the invention, since image processing apparatus can inherently complete to print, sweep
Function at least one of is retouched, duplicates, faxes, then image processing apparatus is allowed to execute file encryption operation, can be made dedicated
Peripheral equipment executes the task of profession, and every computer connecting with image processing apparatus is avoided to require installation virtual printing
Machine reduces the dependence to computer equipment.
[Detailed description of the invention]
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this field
For those of ordinary skill, without any creative labor, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is the module composition block diagram of the image processing apparatus in the embodiment of the present invention；
Fig. 2 is the image processing method in the embodiment of the present invention；
Fig. 3 is another image processing method in the embodiment of the present invention；
Fig. 4 is the schematic diagram chosen in the embodiment of the present invention to characteristic point；
Fig. 5 a-5b is in the embodiment of the present invention for the modification schematic diagram for deleting characteristic point；
Fig. 6 a-6b is in the embodiment of the present invention for the modification schematic diagram for increasing characteristic point；
Fig. 7 a-7b is the signal of the number in the embodiment of the present invention for all connected components connected at modification characteristic point
Figure；
Fig. 8 is that the image processing apparatus in the embodiment of the present invention receives what original text file data was encrypted from computer
Flow diagram.
[specific embodiment]
For a better understanding of the technical solution of the present invention, being retouched in detail to the embodiment of the present invention with reference to the accompanying drawing
It states.
It will be appreciated that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
Its embodiment, shall fall within the protection scope of the present invention.
First embodiment
Image processing apparatus 10 provided in this embodiment can be printer, duplicator, scanner, facsimile machine or and beat
Print scanning, is duplicated, the multi-function printer of the multiple functions in fax.And image procossing provided in this embodiment
Device can modify processing to from the character in external received document data, to generate confidential documents data.
The image processing apparatus of the present embodiment as shown in Figure 1, image processing apparatus 10 in addition to including for completing printing, sweeping
The image processing unit at least one of retouching, duplicate, fax function further includes that receiving unit 102, recognition unit 103, insertion are single
Member 104.
Receiving unit 102, for receiving original text file data from outside, receiving unit 102 here can pass through USB
The modes such as (Universal Serial Bus, universal serial bus), cable network, wireless network receive the original text of external transmission
File data, what the driver that receiving unit 102 can receive on the computer communicated with each other with image processing apparatus 10 issued
Document data, perhaps from the movable storage medium that is inserted into inside image processing apparatus 10 receive document data or from
The movable termination (such as mobile phone, tablet computer) that image processing apparatus 10 is in communication with each other receives document data.
Recognition unit 103, for identification character in original text file data；
Embedded unit 104, for by the character recognized according to its attribute information of scheduled rules modification, to generate guarantor
Ciphertext file data；I.e. embedded unit 104 is by the character recognized according to scheduled its attribute information of certain rules modification, these categories
At least part distinctive points can directly characterize the combination table of the latter's at least part distinctive points in the difference that property information is modified
It solicits articles the confidential informations of shelves.
Preferably, pre-defined rule is added directly to the original text gear number according to scheduled watermark information for the embedded unit
In or the embedded unit passes through to its category of the part of character change of character selection of predetermined quantity in original text file data
Property information generates watermark information.
It should be noted that watermark information provided in this embodiment, which can be, passes through image processing apparatus by user
Webpage page setup, on image processing apparatus operation panel be arranged or the computer that is connect with image processing apparatus
It sends over, content includes copyright information, ownership, generates time, sending object, at least one in other true and false authentication informations
Kind；And by these information, scanning device can be known otherwise embedded unit, generate according to above-mentioned scheduled rule.Separately
Outside, watermark information provided in this embodiment can also be that image processing apparatus is believed according to the watermark that above-mentioned pre-defined rule automatically generates
Breath, the image processing apparatus is set to dedicated confidential documents generating means in this way.
Wherein, the mode that embedded unit 104 generates confidential documents data may is that in original text file data to be believed by modification attribute
By the confidential information of some or all of characterization the document of modification feature in the character of breath；Specifically, image processing apparatus 10
In be provided with the character library of the first seed type, the character library of second of type, the character library of second of type is by the first all types of character library
In some or all of character, according to predefined modification mode (for example, the change between font type, character shape
Modify, the modification between character pitch) it is modified as being different from the character of original character attribute；Recognition unit 103 identifies original text
Shelves in character after, found in the character library of the first seed type can matched character types, then in the first seed type
Searched in character library which character can have in second species type-word library modified according to predetermined amendment mode after corresponding character；It is embedding
The character that can find respective symbols in second species type-word library will be found and is replaced by entering unit 104 and being based on；Then embedding
Enter unit 104 and is replaced the syntagmatic between character based on these to guarantee the encryption information of document；And these encryption information
It when being scanned, duplicate again, printing, will be identified by image processing apparatus, for example, identifying document data a, whether having
Sensitive words, b, the space being replaced between character, c, the combination by modification feature, between d, a, b, c for being each replaced character
Feature etc. obtains encryption information.
Characters' property information includes character code, font name, font size, font spacing, font face, font face
Color, line space, rotation angle etc., modification attribute information there are many processing method, can be modification font size, font spacing,
Font color, line space, rotation angle or replacement character library.Here the processing method of replacement character library includes between font style
Modification, for example the former font name of character is the Song typeface, then the font name of character is substituted for imitation Song-Dynasty-style typeface from the Song typeface, i.e., original text
The character of respective standard character library has been substituted for the respective symbols in other standards character library in file data, can also be that handle belongs to standard
The character of character library is substituted for the character in customized new character library；Or the rotation angle of font, such as regular font is corresponding
Character be substituted for the italicized character in customized new character library.
Receiving unit 102 has different type or format from external received document data.Generally, from removable Storage
Medium or the received document data of movable termination include meeting XML (full name in English Extensive Markup
Language, Chinese be extensible markup language) agreement document data (such as Word, Text, Excel, PPT), PDF text
Part, picture (such as suffix is BMP, JPEG, JPG, TIFF format) file.From the calculating being in communication with each other with image processing apparatus 10
The document data that the driver of machine issues includes PCL (Printer Control Language, printer control language) text
Part, POSTSCRIPT file, pdf document, picture file etc., for these different types of document datas, word in respective document
The description of symbol is not quite similar, and therefore, recognition unit 103 is in identification original text file data before character, it is also necessary to judge original text gear number
According to type；Recognition unit 103 identifies original according to page-describing feature relevant to type according to the type of original text file data
Character in document data；And embedded unit recognition unit 103 is according to word corresponding with current page description language type
Symbol rendering order obtains the character in the original text file data
It is below that PostScript file is illustrated with the type of original text file data:
When the type of original text file data is PostScript file, recognition unit 103 is identified in PostScript file
Show operator (corresponding character rendering order in PostScript page language) obtain original text file data in character.
For PostScript file, a character or character string are exported using show operator, which is worked as
Make the operand of show, and each of string element is seen as a character code, when by show operational character, will complete
Three operations below, first is that corresponding to array as keyword Encoding in current character library using the respective code of character in string
Call number, so that character name is acquired, second is that process is described by the corresponding character of character name call, thus in current path
The subpath of one character shape of middle addition, third is that being filled operation to each character shape subpath using current color.Identification
Unit 103 recognizes the character in original text file data according to show operator, embedded unit 104 by modification moveto,
The operation such as Wmode, stringwidth, scalefont, selectfont, setfont, yshow, xyshow, ashow, kshow
The operand of symbol or keyword is embedded in watermark information to modify characters' property information, to generate confidential documents data.It is preferred that
Ground, the operator that can be combined with character are filtered, and reduce seeking scope, then identify original text gear number according to show operator
Character in.
For PCL file, the mode of character attibute modification is similar with PostScript file, to character in PCL file
Description be all to be described with the combination of attribute add operation symbol, it is embedding when needing to carry out attribute modification to the character in PCL file
Enter relational operator of the unit 104 according to character in PCL file, it is right such as SetFont, SetcharAngle, SetcharScale
Characters' property information is modified.
Embedded unit 104 can generate destination document data, when the character in original text file data does not need to carry out attribute information
When modification, which is copied directly in destination document data, when the character in original text shelves needs attribute information of modifying
When, modified character is put into destination document data after modifying characters' property information, in this way the destination document data
It is formed confidential documents data；It wherein, include modifying the character of attribute information and belonging to without modification in destination document data
The character of property information.
Preferably, the confidential documents data that embedded unit 104 generates include watermark information, by pre- in original text file data
The character of fixed number amount selects part of character to carry out the modification of attribute information to be embedded in watermark information.Watermark information is binary system
Coded data, indicate certain specific meaning, for example, indicate document data the generation time, user right etc..
For being embedded in watermark information, when watermark information is " 1 ", that is, the word of predetermined quantity is indicated to modify font size
One or more characters replacement in symbol has modified font size；When watermark information is " 0 ", i.e., in the character of expression predetermined quantity
One or more characters do not modify its attribute information；Alternatively,
When watermark information is " 0 ", that is, indicate the font size of one or more character changes in the character of predetermined quantity；
When watermark information is " 1 ", i.e., one or more characters in the character of expression predetermined quantity do not modify its attribute information.
For example, embedded unit 104 identifies " I like life with natural " in original text file data 7 characters, to " I " and
" work " word carries out zooming in or out for predetermined amount, indicates insertion watermark information " 1 "；And keep other characters constant, then it represents that embedding
Enter watermark information " 0 ", then after making the modification of font size to " I likes life and nature " 7 characters in original text file data, table
Show the watermark information for being embedded in that encoded information is " 1001000 ", as shown in table 1.
Table 1
Insertion processing for watermark information can also be as shown in table 2.
| Character | I | Love | It is raw | It is living | With | From | So |
| Modification processing | It reduces | It is constant | Amplification | It is constant | Amplification | It is constant | It reduces |
| Watermark information | 1 | 0 | 0 | 1 |
Table 2
In table 2, by being embedded in watermark information " 1001 " every the size of a character change character in character string,
Can also can also directly it be made adjacent by being embedded in watermark information every the size of multiple character change characters in character string
Different modifications is made between character to be embedded in watermark information, as shown in table 3.
| Character | I | Love | It is raw | It is living | With | From | So |
| Modification processing | It reduces | Amplification | Amplification | It reduces | Amplification | Amplification | It reduces |
| Watermark information | 1 | 0 | 0 | 1 | 0 | 0 | 1 |
Table 3
In table 3, watermark information is embedded in by making different modifications between the adjacent character in character string
“1001001”。
The way of modification line space is exactly, at interval of the modification line space of a line in turn, to repair in every page in a document
Adjacent two line positions up and down of the row for spacing of changing one's profession set it is motionless, to the row for needing to be embedded in watermark information carry out it is slight move up or under
It moves, for example, insertion watermark information is " 1 " if this line moves up expression, if this line moves down expression, insertion watermark information is
"0".In general, the spacing of each row in document format is uniform, slight for line space change, and human eye is can not be quasi-
Really identification, in order to be more convenient subsequent extracted watermark information, the first row and last line of the usual page are all not as insertion watermark
The row of information.
It is similar with above-mentioned modification font size for modification font spacing, font color, due to the category by modification character
Property information be embedded in there are many kinds of the modes of watermark information, the attributes such as the thickness of character can also be modified, it is all to pass through modification word
The attribute information of body shall fall within the protection scope of the present invention to reach the method for insertion watermark information.
In addition, the embedded unit 104 of the present embodiment can also be selected by the character to predetermined quantity in original text file data
Part of character change font style does not modify font style to be not substituted for other standards character library or part of character
It is substituted for other standards character library, to be embedded in watermark information.It is specific: when watermark information is 1, i.e., in the character of expression predetermined quantity
One or more characters be substituted for the respective symbols of other standards character library；When watermark information is 0, that is, indicate the word of predetermined quantity
One or more characters in symbol are not substituted for the respective symbols of other standards character library；Alternatively,
When watermark information is 0, i.e., one or more characters in the character of expression predetermined quantity are substituted for other standards word
The respective symbols in library；When watermark information is 1, i.e., one or more characters in the character of expression predetermined quantity are not substituted for it
The respective symbols of his standard character library.
The embedded unit 104 of the present embodiment can also select its middle part by the character to predetermined quantity in original text file data
Point character is substituted for the character of customized new character library or part of character is not substituted for the character of customized new character library,
To be embedded in watermark information.Specific: when watermark information is 1, i.e., one or more characters in the character of expression predetermined quantity replace
Change the respective symbols of customized new character library into；When watermark information is 0, that is, indicate one or more of the character of predetermined quantity
Character is not substituted for the respective symbols of customized new character library；Alternatively,
When watermark information is 0, i.e., one or more characters in the character of expression predetermined quantity are substituted for customized new
The respective symbols of character library；When watermark information is 1, i.e., one or more characters in the character of expression predetermined quantity are not substituted for
The respective symbols of customized new character library.
Watermark information in confidential documents data is visually not easy to be found, and needs through specific device, example
Confidential documents as OCR scanning means exports image processing apparatus 10 scan and recognize word modified in confidential documents
Symbol, gets the watermark information with binary representation, to set in advance according to the watermark information further according to image processing apparatus 10
The coding rule of fixed watermark information learns the source of original text file data.
If setting coding rule are as follows: the generation time that original text file data is indicated when watermark information is " 01010101 ", when
When receiving unit 102 receives original text file data, recognition unit 103 obtains 8 continuation character strings in original text file data, such as
" I am Chinese love China ", embedded unit 104 are substituted for other standards character library or customized to 8 character selected section characters
New character library character, as shown in table 4 below, thus by being embedded into original text file data for the watermark information of " 01010101 ".
| Character | I | It is | In | State | People | Love | In | State |
| Character library | It is constant | Replacement | It is constant | Replacement | It is constant | Replacement | It is constant | Replacement |
| Watermark information | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 |
Table 4
In above-mentioned 8 characters, the former character that corresponding watermark information is 1 is substituted for other standards character library or customized new
Character in character library, or the former character that watermark information in 8 characters is 0 is substituted for other standards character library or customized new
Character in character library, the replaced character place different from former character have font style difference or replaced character
Than former character, there are the differences of structure feature point.
Image processing apparatus 10 further includes storage unit, for storing font file, as TrueType character library,
PostScript character library, Opentype character library, font file include typical standard character library, common such as Song typeface character library, regular script character library
Difference between standard character library includes the difference etc. of font style.Font file can also include customized new character library simultaneously,
Character in standard character library is formed after predefined modification the character in new character library.It can be in all words in standard character library
On the basis of symbol all characters are formed with the character of new character library, or the conventional characters in standard character library into excessively predefined modification
On the basis of the character of new character library is formed by predefined modify to conventional characters, conventional characters here can be according to frequency of use
It counts, for example preceding 2000 characters most common in Chinese character is formed by predefined modification the character of new character library.
Here predefined modification includes that character is made to increase characteristic point or remove characteristic point, modify connection at characteristic point
The number etc. of all connection branches.
Characteristic point refers to that in charcter topology, discontinuous two strokes are during forming font, one of pen
Draw connect at non-endpoint with another stroke be formed by structure, such as Fig. 4 be with the white point marked font spy
Point is levied, if from this point, there can be three or three or more connected components, and the length of each connected component is greater than thing
The threshold value N first set, it is contemplated that the error during print scanned influences, and the value of N here is generally single font image
1/20 or so of height.
It is for the modification schematic diagram for deleting characteristic point shown in Fig. 5 a-5b.Fig. 5 a is unmodified raw font, Fig. 5 b
For modified font, modification mode is the appropriate shortening in part that will lift one's head, and so that the point of intersecting features existing for script is become one and turns
Point, modified branch length are less than threshold value N.The both font types of modification front and back are all Chinese character " word " this minor change not shadows
It rings people to know the people of this font, but the structure of font itself has occurred and that variation.It is different in the embedment of watermark information
Font architecture can represent different hiding informations, such as can be by the font representation watermark information " 0 " of Fig. 5 a, the font of Fig. 5 b
It indicates watermark information " 1 ".
It is for the modification schematic diagram for increasing characteristic point shown in Fig. 6 a-6b.The place of characteristic point is not present in script, passes through
The modes such as stroke trend, length are modified to construct a new characteristic point.Such as it is original in the region that box is identified in Fig. 6 a
It is, by extending a stroke so that with other stroke there is a situation where intersecting, as shown in Figure 6 b, to be produced there is no characteristic point
A raw new characteristic point.
It is the schematic diagram for the number of all connected components connected at modification characteristic point shown in Fig. 7 a-7b.Originally
Characteristic point may be to be crossed to form together by multiple connected components, can pass through the connection direction at modification characteristic point at this time
The number of all connected components constructs new characteristic point.When allowing increase or reducing the number of branches of characteristic point junction one
A important premise, i.e., modified tie point still have characteristic point attribute, include 6 than the characteristic point in region as shown in Figure 7a
Connected component, the characteristic point in region shown in modified Fig. 7 b includes 5 connected components, so being still a feature
Point.
Certainly to the modification of characteristic point, there are also other modes, can make font architecture on the basis of original to characteristic point
Modification shall fall within the protection scope of the present invention.
Attribute information is modified to character to be embedded in watermark information, for replacing the side of character library in a variety of modification modes
Formula is more convenient the subsequent document to image processing apparatus output and extracts watermark information.For example, being beaten for image processing apparatus
The paper document of output is printed, the shooting image obtained after shooting to paper document can zoom in or out, and cause to shoot image
The change of middle character is unfavorable for carrying out the image after shooting the extraction of watermark information, and by the alternative of character library, especially
It is by way of being substituted for new character library, the characteristic point of character is not influenced by any shooting, is more had in favor of subsequent extracted water
Official seal breath.
The image processing apparatus 10 of the present embodiment to received original text file data carry out type judgement after and identify original text
Character object in file data, selectivity carries out the modification of attribute information to character, to be embedded in watermark information, to generate secrecy
Document, image processing apparatus to output or input original text file data carry out aforesaid way secrecy processing, without
As long as the outside that driver side perhaps sends original text file data does any processing and exports or input by image processing apparatus
Original text file data can all carry out watermark information insertion processing, so as to be effectively tracked to original text file data.
Second embodiment
The second embodiment of the present invention is a kind of image processing method, suitable for above-mentioned image processing apparatus, such as Fig. 2 institute
It states, image processing method includes:
Step 202, original text file data is received from outside, specially image processing apparatus can pass through various communication interfaces
(such as USB, infrared, bluetooth, NFC, wireless network card) receives the external original text file data sent；
Step 203, the character in original text file data is identified；
Step 204, by the character recognized according to its attribute information of scheduled rules modification, to generate confidential documents number
According to.
Characters' property information includes character code, font name, font size, font spacing, font face, font face
Color, line space, rotation angle etc., modification attribute information there are many processing method, can be modification font size, font spacing,
Font color, line space, rotation angle or replacement character library.Here the processing method of replacement character library includes between font style
Replacement, for example the former font name of character is the Song typeface, then the font name of character is substituted for imitation Song-Dynasty-style typeface from the Song typeface, i.e., original text
The character of respective standard character library has been substituted for the respective symbols in other standards character library in file data, can also be that handle belongs to standard
The character of character library is substituted for customized new character library.
There are different type or format from external received document data, such as meets the document data of XML protocol
(word, Text, excel etc.), pdf document, picture format (such as BMP, JPEG) file, PCL file, PostScript file
Deng, for the document data of these different types or format, image processing apparatus needs gone according to the type of original text file data
Identify the character in original text file data.
Therefore, in image processing method as shown in Figure 3, step 202,204 with above-mentioned Fig. 2 in step 202,204
It is identical, it further include step 301 and 302；
Step 301, judge the type of original text file data；
Judgement of the image processing apparatus to format or type is carried out from external received original text file data；
Step 302, according to the type of original text file data, original text shelves are identified according to page-describing feature relevant to type
Character in data.
Type of the image processing apparatus according to original text shelves, identifies original text gear number according to special characteristic relevant to the type
Character in.
It is below that PostScript file is illustrated with the type of original text file data:
When the type of original text file data is PostScript file, recognition unit 103 is identified in PostScript file
Show operator obtain original text file data in character.
For PostScript file, a character or character string are exported using show operator, which is worked as
Make the operand of show, and each of string element is seen as a character code, image processing apparatus encounters show operation
When character, following three operations will be completed, first is that using the respective code of character in string as keyword in current character library
Encoding corresponds to the call number of array, so that character name is acquired, second is that passing through the corresponding character description of character name call
Process, so that the subpath of a character shape is added in current path, third is that using current color to the sub- road of each character shape
Diameter is filled operation.
Recognition unit 103 recognizes the character in original text file data according to show operator, and embedded unit 104 passes through modification
moveto、Wmode、stringwidth、scalefont、selectfont、setfont、yshow、xyshow、ashow、
The operand of the operators such as kshow or keyword is embedded in watermark information to modify characters' property information, to generate secrecy text
File data.
For PCL file, the mode of character attibute modification is similar with PostScript file, to character in PCL file
Description be all to be described with the combination of attribute add operation symbol, it is embedding when needing to carry out attribute modification to the character in PCL file
Enter relational operator of the unit 104 according to character in PCL file, such as SetFont, SetcharAngle, SetcharScale couple
Characters' property information is modified.
Image processing apparatus can generate destination document data, when the character in original text file data does not need to carry out attribute information
When modification, which is copied directly in destination document data, when the character in original text shelves needs attribute information of modifying
When, modified character is put into destination document data after modifying characters' property information, in this way the destination document data
It is formed confidential documents data；It wherein, include modifying the character of attribute information and belonging to without modification in destination document data
The character of property information.
Image processing apparatus also stores font file, such as TrueType character library, PostScript character library, Opentype word
Library, font file include typical standard character library, and such as Song typeface character library, regular script character library, the difference between typical standard character library includes word
The difference of body style.Font file can also include customized new character library simultaneously, the character in standard character library by predetermined
Justice-reparation forms the character in new character library after changing.Can on the basis of all characters in standard character library to all characters into excessively pre-
Definition modification forms the character of new character library, or passes through on the basis of conventional characters to conventional characters in standard character library and predefine
Modification forms the character of new character library, and conventional characters here can be counted according to frequency of use, such as the most frequently used in Chinese character
Preceding 2000 characters form the character of new character library by predefined modify.
Here predefined modification includes that character is made to increase characteristic point or remove characteristic point, modify connection at characteristic point
The number of all connection branches.
The modification of characteristic point describes in the above-described embodiment, is described again here.
The confidential documents data generated in step 204 include watermark information, by predetermined quantity in original text file data
Character selects part of character to carry out the modification of attribute information to be embedded in watermark information.
Modification attribute information includes the font size for modifying character, font spacing, font color, line space or replacement word
Library, the mode of modification illustrates in example 1, is described again here.
Watermark information in confidential documents data is visually not easy to be found, and needs through specific device, example
Confidential documents as OCR scanning means exports image processing apparatus scan and recognize word modified in confidential documents
Symbol, extracts the watermark information with binary representation, to preset according to the watermark information further according to image processing apparatus
The coding rule of watermark information learn the source of original text file data.
By above-mentioned image processing method, image processing apparatus can be made to carry out at secrecy received original text file data
Reason does not need virtual printer in the prior art to execute and be embedded in watermark information to document data, thus by identification
To original text file data in character selectivity modify attribute information, to be embedded in watermark information, to generate confidential documents number
According to.
3rd embodiment
On the basis of second embodiment of the invention, the present embodiment is specifically described when modification characters' property information is replacement
The image processing method of image processing method when character library, the present embodiment includes:
Original text file data is received from outside, also receives look-up table together, look-up table includes all characters in original text file data
Encoded information；
Identify the character in original text file data；
By the character recognized according to its attribute information of scheduled rules modification, to generate confidential documents data；Wherein,
Its attribute information is modified as replacement character library；
Further, by the character recognized, according to scheduled rules modification, its attribute information is specifically included:
One or more target characters, the encoded information according to target character in look-up table are selected in the character recognized
The character font data of new character library is searched, updates look-up table, keeping the encoded information of the target character in look-up table corresponding is new character library
Character font data.
The present embodiment is selected the character recognized by carrying out character recognition to from the received original text file data of computer
Character library is replaced to property, to generate confidential documents data.
When image processing apparatus receives original text file data from computer, the driver of computer to original text file data into
Row is converted into the identifiable file of image processing apparatus, and generates look-up table according to the character in original text file data, in look-up table
Store the Unicode code and printed indicia value of each character in original text file data；It is available by the Unicode code of character
Character font data of the character in character library, the look-up table are the relationship look-up table of character and character library.Unicode code is encoded information
It is a kind of.
Driver after conversion process original text file data and look-up table be sent to image processing apparatus, image procossing
The process that received original text file data is encrypted in device is as shown in Figure 8.
Step 801, it carries out user's selection original text file data to be printed to be converted into the identifiable text of image processing apparatus
Part, such as PCL, PS (PostScript) file；
Step 802, according to the character and the corresponding former character library generation look-up table of character in original text file data, and lookup
Original text file data after table and conversion is issued to image processing apparatus；
Step 803, judge whether to need that watermark is arranged, it is preferred that whether step 803 is according to user in image procossing dress
The operation of watermark addition is provided on the panel set to determine whether needing that watermark is arranged, if user is in image processing apparatus
Panel on be provided with watermark addition operation, then enter step 804, if you do not need to being configured watermark, be then directly transferred to
Step 810；Step 803 is also to judge whether to need that received original text file data is encrypted.
Step 804, the character in original text file data is identified；
Step 805, judge whether it is target character；Step 805 is used to judge whether the character in original text file data to be to need
It is replaced the target character of character library；When if the determination result is YES, 806 are entered step, if judging result is no, into step
Rapid 807；
Step 806, judge whether that new character library is installed；Step 806 judges whether image forming apparatus has installed new character library,
If being fitted without new character library, 807 are entered step；If having installed new character library, expression can be replaced target character
Character library is changed, enters step 808；
Step 807, using the character font data of former character library；For not being that the character of target character does not need replacement character library
Character or when being fitted without new character library for target character, printed out using the character font data of former character library, specifically
The character font data of former character library is obtained according to the Unicode code in look-up table；
Step 808, for needing to replace the target character of character library, according to the new character library of Unicode code lookup in look-up table
Character font data, and update look-up table, make the Unicode code of target character in a lookup table it is corresponding be new character library font number
According to；
Step 809, judge whether to have handled all characters；If the judging result of step 809 be it is no, enter step 804,
Then continue to search character in original text file data, the operation for selectively replacing character library is carried out, if the judging result of step 809 is
It is that expression has obtained character font data to all characters, then enters step 811；
Step 810, the original text file data for not needing to be configured watermark, it is also desirable to the character of original text file data into
Row identification searches the character font data of former character library according to the Unicode code in look-up table, using the character font data of former character library to character
It prints；
Step 811, received original text file data is printed out, wherein image processing apparatus is with printed indicia value generation
One character of table mainly gets the printout of character the Unicode code of character according to the printed indicia value of look-up table,
Then character font data of the character in new character library or former character library is got according to Unicode code, is then beaten according to character font data
Print processing.The character font data indicates description or the drawing process of character.
In above-mentioned steps, step 801-802 is executed by the driver of computer, and step 803-811 is filled by image procossing
Set execution, according to above-mentioned process flow, image processing apparatus can to the character in the file issued by driver into
The operation of row replacement character library is embedded in watermark information, generates encrypted document data, to beating again after received former document data encryption
Print output does not need virtual printer in the prior art to execute and be embedded in watermark information to document data.
The encoded information for belonging to the identical characters of different character libraries can be converted into identical Unicode code, only it is to be understood that word
The Unicode code of symbol can obtain the corresponding character font data of character in different character libraries.If the encoded information of former character library
It is not Unicode code (such as GB code), and the encoded information of new character library is Unicode code, then when replacing character library, by target character
It searches the character font data in new character library again after the encoded information of former character library is converted into Unicode code, and is looking into target character
The encoded information of table is looked for be updated to the Unicode code of new character library.If the encoded information of former character library and new character library is not
Unicode code, then when replacing character library, by target character after the encoded information of former character library is converted into Unicode code, then will conversion
Obtained Unicode code is converted into the encoded information of new character library, then searches the character font data in new character library, and target character is made to exist
The encoded information of look-up table is updated to the encoded information of new character library.Similarly, if the encoded information of former character library is Unicode code,
And the encoded information of new character library is not Unicode code, then when replacing character library, the Unicode code by target character in former character library turns
It changes the character font data searched after the encoded information of new character library again in new character library into, and makes target character in the Unicode of look-up table
Code is updated to the encoded information of new character library.
For in original text file data including the character of " I am Chinese ", " I am Chinese " this five characters are being calculated
The Unicode code of former character library on machine is respectively 0x6211,0x662f, 0x4e2d, 0x56fd, 0x4eba, driver foundation
The look-up table 1 that character " I am Chinese " generates is as follows:
| Unicode code | Printed indicia value |
| 0x6211 | 0000 |
| 0x662f | 0001 |
| 0x4e2d | 0010 |
| 0x56fd | 0011 |
| 0x4eba | 0100 |
Look-up table 1
When image forming apparatus needs to be configured watermark to original text file data, to " I am Chinese " five character choosings
Replace character library selecting property to be embedded in watermark information, wherein character " I " " in " " people " be target character, then image processing apparatus according to
According to look-up table 1 " I " " in " the Unicode code of " people " character searches the character font data of new character library, and makes " I " of look-up table 1
" in " it is corresponding to be worth corresponding Unicode code for the printed indicia of " people " character is the character font data of new character library to realize look-up table 1
Update, after update, " I " in look-up table 1 " in " printed indicia of " people " three characters is worth corresponding Unicode code correspondence
Be new character library character font data, and it is former that the corresponding Unicode code of printed indicia value of two characters of "Yes" " state " is corresponding
The character font data of character library represents watermark information " 1 " according to replacement character library, does not replace the mode that character library represents watermark information " 0 ", then
By above-mentioned replacement character library process, to " I am Chinese " five characters selections " I " " in " " people " three characters replace word
Library is to be embedded in watermark information " 10101 ".The encoded information of this example Central Plains character library and new character library is all Unicode code.Pass through this
The image processing method of embodiment, can make image processing apparatus to the received original text file data of slave driver select one or
Multiple predeterminated target characters are replaced character library, do not need to install virtual printer on computers in the prior art to execute
Watermark information is embedded in document data, and improves image processing apparatus to the protective capability of confidential documents, user and then energy
It is enough effectively to track the document data exported via image processing apparatus.
Fourth embodiment
On the basis of first embodiment, the present embodiment is specifically described when modifying characters' property information is replacement character library
The implementation procedure of image processing apparatus.
The present embodiment provides a kind of image processing apparatus, comprising:
Receiving unit 102 also receives look-up table for receiving original text file data from outside together, includes original text in look-up table
The encoded information of all characters in file data；
Recognition unit 103, for identification character in original text file data；
Embedded unit 104, for by the character recognized according to its attribute information of scheduled rules modification, to generate guarantor
Ciphertext file data；Wherein, its attribute information is modified as replacement character library；
Embedded unit 104 is further used for:
One or more target characters, the encoded information according to target character in look-up table are selected in the character recognized
The character font data of new character library is searched, updates look-up table, keeping the encoded information of the target character in look-up table corresponding is new character library
Character font data.
When image processing apparatus original text file data received from computer, the driver of computer is to original text file data
Be converted to the identifiable file of image forming apparatus and generate look-up table according to the character in original text file data, in look-up table
Store the Unicode code and printed indicia value of each character in original text file data；It is available by the Unicode code of character
Character font data of the character in character library.Unicode code is one kind of encoded information.
Image processing apparatus implements for example above-mentioned third of the encryption process of the received original text file data of slave driver
Step 803-811 in Fig. 8 of example, is not repeated herein description.
Image processing apparatus through this embodiment selects one to from the external received original text file data of driver
Or multiple predeterminated target characters are replaced character library, do not need to install virtual printer on computers in the prior art to hold
Row is embedded in watermark information to document data, and improves image processing apparatus to the protective capability of confidential documents, and user is in turn
The document data exported via image processing apparatus can effectively be tracked.
5th embodiment
On the basis of second embodiment of the invention, the present embodiment is specifically described when modification characters' property information is replacement
The image processing method of image processing method when character library, the present embodiment includes:
Original text file data is received from outside；
Identify the character in original text file data；
By the character recognized according to its attribute information of scheduled rules modification, to generate confidential documents data；Wherein,
Its attribute information is modified as replacement character library；
Further, by the character recognized, according to scheduled rules modification, its attribute information is specifically included: what is recognized
One or more target characters are selected in character, obtain the encoded information of target character, search new character library according to encoded information
Character font data, and make the encoded information of target character it is corresponding be new character library character font data.
When image processing apparatus receives original text file data from outside (such as USB flash disk or mobile terminal), received original text shelves
Data are the original documents (such as word, excel, PPT) without any processing, and image processing apparatus is in original text file data
The encoded information for obtaining target character is replaced character library to target character according to the encoded information obtained.
The image processing method of the present embodiment can be to from the number of files that can be taken storage medium or movable termination and send
It is and existing according to or to carrying out the processing that insertion watermark information realizes encipherment protection without the original document that driver is handled
The document data that virtual printer in technology can not generate these data sources is obtained and executes track protection.
Sixth embodiment
On the basis of first embodiment, the present embodiment is specifically described when modifying characters' property information is replacement character library
The implementation procedure of image processing apparatus.
The present embodiment provides a kind of image processing apparatus, comprising:
Receiving unit 102, for receiving original text file data from outside；
Recognition unit 103, for identification character in original text file data；
Embedded unit 104, for by the character recognized according to its attribute information of scheduled rules modification, to generate guarantor
Ciphertext file data；Wherein, its attribute information is modified as replacement character library；
Embedded unit 104 is further used for: selecting one or more target characters in the character recognized, obtains target
The encoded information of character searches the character font data of new character library according to encoded information, and keeps the encoded information of target character corresponding
It is the character font data of new character library.
When image processing apparatus receives original text file data from outside (such as USB flash disk or mobile terminal), received original text shelves
Data are the files (such as word, excel, PPT) without any processing, and image processing apparatus can be from original text file data
The encoded information for obtaining target character is replaced character library to target character according to the encoded information obtained.If connect from outside
The original text file data of receipts is pdf document, and image processing apparatus is first converted into pdf document to meet the file of XML standard, then carries out
The operation of character recognition and replacement character library.
The image processing apparatus of the present embodiment can be to from the number of files that can be taken storage medium or movable termination and send
It is and existing according to or to carrying out the processing that insertion watermark information realizes encipherment protection without the original document that driver is handled
The document data that virtual printer in technology can not generate these data sources is obtained and executes track protection.
Virtual printer in the prior art needs to carry out secondary development dimension according to the upgrading of the driver of computer
Shield, when using an image processing apparatus for multiple stage computers, every computer requires installation virtual printer, for meter
The workload of the secondary development maintenance of virtual printer on calculation machine is very big, the above-mentioned technical side that the embodiment of the present invention provides
Can receiving unit 102, recognition unit 103, embedded unit 104 be set up directly in image processing apparatus or schemed in case
As processing unit storage medium in storage be able to carry out the instruction or program of above-mentioned image processing method, such image procossing dress
Secrecy processing can be carried out for the document data for inputting or exporting by setting, not only save user execute encrypted print, duplicating,
The time of the operations such as scanning, and save the workload of follow-up maintenance upgrading.
In addition, image processing apparatus and image processing method of the invention can be to from can take storage medium or removable
The document data that terminal is sent carries out the processing that insertion watermark information realizes encipherment protection, and virtual printer in the prior art
The document data that can not be generated to these data sources is obtained and executes track protection.
Those of ordinary skill in the art will appreciate that: realize that all or part of the steps of above method embodiment can pass through
The relevant hardware of program instruction is completed, and program above-mentioned can be stored in a computer readable storage medium, the program
When being executed, step including the steps of the foregoing method embodiments is executed；And storage medium above-mentioned includes: ROM, RAM, magnetic disk or light
The various media that can store program code such as disk.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.
Claims (8)
1. a kind of image processing apparatus characterized by comprising
Receiving unit receives original text file data from outside；
Recognition unit identifies the character in the original text file data；
Embedded unit, by the character recognized according to its attribute information of scheduled rules modification, to generate confidential documents data；
Wherein,
When modifying the attribute information to replace character library, the receiving unit also receives look-up table, and the look-up table is according to
The corresponding former character library of character and character in original text file data generates, the coding including all characters in the original text file data
Information；
The embedded unit is specifically used for:
One or more target characters are selected in the character recognized, according to target character described in the look-up table
Encoded information searches the character font data of new character library, updates the look-up table, believes the coding of the target character in the look-up table
Cease it is corresponding be the new character library character font data.
2. image processing apparatus according to claim 1, which is characterized in that the recognition unit is identifying the original text shelves
Before character in data, the type of the original text file data is judged；The recognition unit according to the type of the original text file data,
The character in the original text file data is identified according to page-describing feature relevant to the type.
3. image processing apparatus according to claim 2, which is characterized in that the recognition unit is according to the original text gear number
According to type, the character in the original text file data is identified according to page-describing feature relevant to the type, specifically:
The character in the original text file data is obtained according to character rendering order corresponding with current page description language type.
4. image processing apparatus according to any one of claims 1 to 3, which is characterized in that the pre-defined rule is described
Embedded unit is added directly in the original text file data according to scheduled watermark information or the embedded unit passes through to original
The character of predetermined quantity selects part of its attribute information of character change to generate watermark information in document data.
5. a kind of image processing method suitable for image processing apparatus, which is characterized in that the described method includes:
Original text file data is received from outside；
Identify the character in the original text file data；
By the character recognized according to its attribute information of scheduled rules modification, to generate confidential documents data；Wherein,
When the modification attribute information is replacement character library, described image processing method further include: look-up table is received from outside, it is described
Look-up table according in the original text file data character and the corresponding former character library of character generate, including in the original text file data
The encoded information of all characters；
According to scheduled rules modification, its attribute information specifically includes the character that will be recognized:
One or more target characters are selected in the character recognized, according to target character described in the look-up table
Encoded information searches the character font data of new character library, updates the look-up table, believes the coding of the target character in the look-up table
Cease it is corresponding be the new character library character font data.
6. image processing method according to claim 5, which is characterized in that identifying the character in the original text file data
Before, judge the type of the original text file data；According to the type of the original text file data, according to the page relevant to the type
Expressive Features identify the character in the original text file data.
7. image processing method according to claim 6, which is characterized in that according to the type of the original text file data, press
The character in the original text file data is identified according to page-describing feature relevant to the type, is described according to current page
The corresponding character rendering order of category of language obtains the character in the original text file data.
8. according to the described in any item image processing methods of claim 5 to 7, which is characterized in that according to the pre-defined rule
Scheduled watermark information is added directly in the original text file data, or passes through the character to predetermined quantity in original text file data
Part of its attribute information of character change is selected to generate watermark information.
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| CN107302645B (en) * | 2017-04-27 | 2019-08-16 | 珠海赛纳打印科技股份有限公司 | A kind of image processing apparatus and its image processing method |
| CN108664774A (en) * | 2018-04-16 | 2018-10-16 | 深圳市联软科技股份有限公司 | A kind of timely method, apparatus, storage medium and system for generating watermark |
| CN108830772A (en) * | 2018-05-25 | 2018-11-16 | 珠海奔图电子有限公司 | Watermark encoder conversion method and device |
| CN111445375A (en) * | 2019-01-16 | 2020-07-24 | 阿里巴巴集团控股有限公司 | Watermark embedding scheme and data processing method, device and equipment |
| CN109766978B (en) * | 2019-01-17 | 2020-06-16 | 北京悦时网络科技发展有限公司 | Word code generation method, word code identification device and storage medium |
| CN110414195A (en) * | 2019-07-09 | 2019-11-05 | 恩亿科(北京)数据科技有限公司 | A kind of data are anti-fake and source tracing method, system, medium and computer equipment |
| CN112417387A (en) * | 2020-11-18 | 2021-02-26 | 国家电网有限公司 | Dark watermark display identification device based on computer identification and identification method thereof |
| CN112417087B (en) * | 2020-12-14 | 2024-03-19 | 合肥高维数据技术有限公司 | Text-based tracing method and system |
| CN112688858B (en) * | 2020-12-18 | 2022-07-26 | 合肥高维数据技术有限公司 | Mail sending method and device |
| CN117350909A (en) * | 2023-10-24 | 2024-01-05 | 江苏群杰物联科技有限公司 | Text watermark processing method and device, electronic equipment and storage medium |
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