CN116127916B - Method and device for dynamically adding watermark - Google Patents
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Abstract
The application discloses a method and a device for dynamically adding watermarks, wherein the method comprises the following steps: analyzing an OFD page of the open fixed format document, and establishing an OFD display model according to an analysis result; according to the attribute of the watermark characters and the attribute of the OFD page, arranging the watermark characters on the OFD page, and generating a watermark path data set according to arrangement conditions, wherein the watermark path data set comprises all watermark path data which need to be added on the OFD page; randomly extracting watermark path data from the watermark path data set, and inserting watermark graphic data corresponding to the watermark path data into a layer of the OFD display model. According to the method, the OFD display model is built by analyzing the OFD page, and watermark graphic data is inserted into the image layer of the OFD display model according to the watermark path data, so that the confidentiality of the watermark can be improved, and an infringer is not easy to position the watermark.
Description
Technical Field
The application belongs to the technical field of computers, and particularly relates to a method and a device for dynamically adding watermarks.
Background
Along with popularization and popularity of OFD (Open Fixed-layout Documents) files, a large number of OFD reading and editing software and background processing programs appear on the market, and many of the OFD files have watermark processing functions and can be added with or removed from the OFD format files.
From the technical point of view, the current watermarking processing thought is single, two types are commonly used, namely, a watermarking annotation is used, the scheme uses words or images to describe the appearance of the watermark, and the advantage is that the grammar structure supported by the OFD format is utilized, and other standard OFD software can be identified. Another solution is to add text to the page content and mix the watermark content with the text content. The common feature of both schemes is the embedding of textual profile information and character codes, which may be referred to as "plaintext watermarks".
The plaintext watermark is convenient for human reading, can play the roles of advertising and warning readers of author copyrights, but has the problem of being easy to erase, for example, the watermark annotation adopts a grammar structure supported by an OFD format, and common OFD software can identify where watermark data is, so that the watermark data can be directly edited or removed. However, for the scheme of adding text in page content and mixing watermark content and text content, the recognition difficulty is not great as a whole, for example, the text content of the watermark is manually specified, and then the watermark text is screened by a text searching mode is also possible, but the processing process is slightly complicated.
Therefore, the plaintext watermarking technology in the prior art has the defect that watermark elements are easy to locate and erase, and the confidentiality of the watermark is low.
Content of the application
The embodiment of the application aims to provide a method and a device for dynamically adding watermarks, which are used for solving the defect that the watermarks are easy to locate and erase in the watermarking technology in the prior art.
In order to solve the technical problems, the application is realized as follows:
In a first aspect, a method for dynamically watermarking is provided, comprising the steps of:
Analyzing an OFD page of the open fixed format document, and establishing an OFD display model according to an analysis result;
According to the attribute of the watermark characters and the attribute of the OFD page, arranging the watermark characters on the OFD page, and generating a watermark path data set according to arrangement conditions, wherein the watermark path data set comprises all watermark path data which need to be added on the OFD page;
Randomly extracting watermark path data from the watermark path data set, and inserting watermark graphic data corresponding to the watermark path data into a layer of the OFD display model.
In a second aspect, there is provided an apparatus for dynamically watermarking, comprising:
The analysis module is used for analyzing the OFD page of the open fixed format document and establishing an OFD display model according to the analysis result;
The generation module is used for arranging the watermark characters on the OFD page according to the attribute of the watermark characters and the attribute of the OFD page, and generating a watermark path data set according to the arrangement condition, wherein the watermark path data set comprises all watermark path data which need to be added on the OFD page;
And the inserting module is used for randomly extracting watermark path data from the watermark path data set and inserting watermark graphic data corresponding to the watermark path data into the image layer of the OFD display model.
According to the embodiment of the application, the OFD display model is built by analyzing the OFD page, and the watermark graphic data is inserted into the image layer of the OFD display model according to the watermark path data, so that the concealment of the watermark can be increased, and an infringer is not easy to position the watermark.
Drawings
Fig. 1 is a flowchart of a method for dynamically adding watermarks according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a device for dynamically watermarking according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Along with the increasing popularization of domestic basic software, the application range of OFD format files is wider and wider, and watermarks need to be added in many business scenes, so that the method is used as Logo to play an advertising role on one hand and is also a copyright statement means on the other hand. Most of software uses fixed plaintext watermark, such as OFD standard watermark, adding text content, etc., the scheme is simple to realize, but has a significant problem of easy cracking, and common users can easily identify and delete by program mode using OFD reading software or technical manufacturer, and then diffuse files, so infringement cost is low, which is not beneficial to protecting rights of authors.
In order to solve the problems of the watermark embedding technology, the embodiment of the application provides a method and a device for adding a dynamic Path watermark in an OFD format, and improves the watermark adding mode and process, thereby increasing the recognition difficulty of the watermark. The method has the advantages that the method of adding the watermark in the page layer replaces the direct use of the OFD watermark structure and the text Path object replaces the text watermark, so that a cracker cannot simply position the watermark structure, and meanwhile, violent retrieval of watermark data is prevented. The improvement of the process is characterized in that firstly, all watermark elements in a page are typeset, then, the coordinate transformation of a single watermark Path is calculated, in addition, the insertion position of the watermark elements is dynamically selected, the random generation of the watermark initial position in the whole page is included, the insertion layer of the watermark elements is randomly generated, and meanwhile, the OFD display model is detected to ensure the correctness of the watermark and the overall display effect of the page content, and the difficulty of watermark cracking can be greatly increased through the improvement.
Specifically, the technical scheme of the embodiment of the application comprises the following three key steps:
1. OFD page analysis, identifying layers and primitives
And analyzing the OFD file according to the grammar rule of the OFD format file, and obtaining the width, the height, the layer and the primitive data in the layer, wherein the primitive types comprise graphics, images, characters, videos and composite objects. And analyzing the primitive Boundary attribute to obtain the plane distribution of the visual elements in the layers, and sequentially pushing the visual elements into a stack according to the appearance sequence of the layers to form a stacking relationship, so as to establish a simple display model of the OFD page.
2. Path data extraction and watermark page typesetting
And loading a watermark font file, and extracting font Path data and font width information of the watermark text. The watermarks are sequentially arranged along the reading direction from the origin of the first character pattern, the offset of the next character and the previous character in the X direction is the width of the former character, and the character offset is recorded at the same time, so that single-line typesetting data taking the character pattern Path as the basic is formed. According to the width and the height of the page, the width and the height of the single-row watermarks, the watermark spacing and the number of watermarks needing to be tiled in the page are calculated, so that all watermark Path data sets needing to be added in the page are obtained.
3. Watermark Path data insertion processing
After the processing of the last step, each piece of data in the watermark Path data set has a complete coordinate transformation relation, including offset in watermark lines, watermark line rotation and watermark unit relative page offset, the final display coordinates of the watermark on the page can be calculated by determining the page watermark starting position, and meanwhile, the relation between the data is discrete and does not need to be processed in sequence, so that a single Path data can be randomly selected for processing. The dynamics of Path data insertion are reflected in the following aspects, firstly, path data are not added piece by piece, and are randomly extracted from a set; secondly, the watermark initial position offset of each page is dynamically calculated, so that the difference of each page can be ensured; again, the Path inserted layer is not fixed and is dynamically generated by the program, where the Path inserted layer cannot be occluded by normal primitives in the page, taking into account the correctness of the display, referring to the OFD display model.
The method for dynamically adding the watermark provided by the embodiment of the application is described in detail through specific embodiments and application scenes thereof with reference to the accompanying drawings.
As shown in fig. 1, a flowchart of a method for dynamically adding watermarks is provided in an embodiment of the present application, where the method includes the following steps:
and step 101, analyzing the OFD page, and establishing an OFD display model according to the analysis result.
Specifically, an OFD page can be analyzed to obtain a plurality of layers of the OFD page; respectively analyzing a plurality of layers of the OFD page to obtain the primitives of each layer; respectively analyzing rectangular areas of the primitives of each layer, and establishing plane distribution of the primitives of each layer; and according to the sequence of each layer appearing on the OFD page, pushing each layer into a stack in sequence, and establishing a stacking relation of the layers to form the OFD display model.
And 102, arranging the watermark characters on the OFD page according to the attribute of the watermark characters and the attribute of the OFD page, and generating a watermark path data set according to the arrangement condition.
Specifically, a watermark font file can be loaded, and font path data and font width information can be extracted word by word; sequentially arranging watermark characters along the reading direction from the origin of the first character pattern, wherein the offset of the next watermark character and the previous watermark character in the X direction is the width of the next watermark character, and recording the offset, the line width and the line height in the line to form single-line typesetting data taking the character pattern path as the basic; calculating a transformation matrix of the font path data according to the rotation angle of the watermark characters; according to the width and the height of the OFD page, the line width, the line height and the watermark spacing of the single-line watermarks, the number of watermarks needing to be tiled in the page is calculated, and a watermark path data set is obtained.
Wherein the watermark path data set comprises all watermark path data that needs to be added at said OFD page.
Step 103, watermark path data are randomly extracted from the watermark path data set, and watermark graphic data corresponding to the watermark path data are inserted into the layer of the OFD display model.
Each piece of watermark path data in the watermark path data set has a complete coordinate transformation relation, including offset in watermark lines, watermark line rotation and offset of watermark units relative to pages.
Correspondingly, watermark initial offset of the OFD page can be randomly generated, and watermark path data can be randomly extracted from the watermark path data set; calculating the final display position of a watermark pattern corresponding to watermark path data in the OFD page according to watermark initial offset, watermark line internal offset, watermark line rotation and watermark unit relative page offset in the watermark path data; randomly generating a watermark insertion layer sequence number, and inserting watermark graphic data corresponding to the watermark path data into a layer corresponding to the sequence number.
In this embodiment, watermark graphic data corresponding to the watermark path data may be inserted into a layer of the OFD display model by performing the following steps:
step A: adding a new layer in the OFD page, and inserting the new layer into the topmost layer of the OFD page;
And (B) step (B): randomly generating a watermark insertion layer sequence number;
Step C: detecting whether the image layer corresponding to the serial number and the image layer on the upper layer of the image layer have the image element of the external matrix intersection of the watermark image corresponding to the watermark path data according to the OFD display model, and if not, executing the step D; otherwise, executing the step E;
step D: inserting watermark graphic data corresponding to the watermark path data into the layer corresponding to the sequence number;
Step E: and (C) adding 1 to the serial number, and returning to the step (C).
According to the embodiment of the application, the OFD display model is built by analyzing the OFD page, and the watermark graphic data is inserted into the image layer of the OFD display model according to the watermark path data, so that the concealment of the watermark can be increased, and an infringer is not easy to position the watermark.
In the embodiment of the application, an OFD page is analyzed, an OFD display model is established based on a layer and a basic graphic element, watermark content describes a text object by using text Path data, watermark display difference is caused in each page by dynamically setting watermark offset in the page, watermark insertion layers are dynamically selected by combining the OFD display model, and element insertion positions in the layer are dynamically selected.
The method for analyzing the OFD page and identifying the layers and the parts of the primitives comprises the following steps:
1. analyzing the OFD page to obtain a layer set Cl of the page;
2. Analyzing the OFD layer to obtain a primitive set Ce, wherein the primitive types comprise graphics, images, characters, videos and composite objects;
3. analyzing the rectangular area of the primitive, and establishing the plane distribution of the primitive of the current layer;
4. the page layers are sequentially stacked, a Z-axis stacking relation of the layers is established, and a simple display model Vm of the OFD page content is formed.
Further, the Path data extraction and watermark page typesetting part comprises the following steps:
5. Loading watermark font file, extracting character pattern Path data P and character width W word by word
6. Typesetting of watermark pages:
6.1. Typesetting in a row, sequentially arranging watermarks along a reading direction from a first character origin, wherein the offset of a next character and a previous character in the X direction is the width of the former character, and recording the offset Offx in the row, the row width Lw and the row height Lh;
6.2. Unit typesetting, namely calculating a transformation matrix Mc of the font Path data according to the rotation angle of the watermark;
6.3. Page typesetting, namely calculating the number of watermarks needing to be tiled in a page and the positions Upos of each unit according to the width and the height of the page, the width and the height of a single row of watermarks and the watermark spacing;
6.4. Collecting data, and generating typesetting parameters of all watermark Path data to form a set Cwater according to typesetting conditions of the watermark units in the page, wherein each element E comprises P, upos, mc, offx;
Further, based on the OFD display model, inserting the portion of watermark Path data includes the steps of:
7. adding a new layer Lt in the page, and inserting the top layer of the page;
8. randomly generating a watermark start offset Offpage in the current page;
9. Randomly fetching a watermark element E from the collection Cwater;
10. calculating the final display position of E in the page and the circumscribed rectangle Re according to the offset Offx of E in the unit, the watermark unit rotation matrix Mc, the unit position Upos and the watermark page initial offset Offpage;
11. Randomly generating a watermark insertion layer sequence number Index, detecting whether a graphic element intersected with R exists in the Index layer and an upper layer of the Index layer according to the display model Vm, if not, executing a step 12, otherwise, taking index+1 by the Index layer, and continuing to detect until the Lt layer;
12. through the calculation in the step 11, the screened Index layer has no problem of influencing Vm, so that the watermark Path data can be inserted into the back of the existing graphic element of the layer, and the position is still dynamically determined through random generation;
13. inserting watermark graphic data into an Index layer, and setting Path data, a bound, a transformation matrix and the like;
14. whether watermark elements exist in the set Cwater is judged, if yes, the step 9 is passed, otherwise, the writing flow is ended.
The embodiment of the application can realize the increase of the hiding performance of the watermark by modifying the watermark adding mode and the adding process, greatly enhance the difficulty of watermark identification while maintaining the display effect of the plaintext watermark, prevent an infringer from easily positioning watermark elements and erasing, and improve the watermark removing cost, thereby protecting the rights of an author, fully considering the shielding influence of page contents on the watermark elements in the watermark embedding process, and ensuring the correct hierarchical relationship between the added watermark elements and the page elements by dynamically selecting layers and adjusting, thereby perfectly displaying the display effect to be achieved by the watermark, and finally ensuring the consistency of the watermark effect embedded by the technology and conventional processing.
As shown in fig. 2, a schematic structural diagram of a device for dynamically adding watermarks according to an embodiment of the present application includes:
the parsing module 210 is configured to parse the open fixed format document OFD page, and build an OFD display model according to the parsing result.
Specifically, the parsing module 210 is specifically configured to parse an OFD page, so as to obtain multiple layers of the OFD page; respectively analyzing a plurality of layers of the OFD page to obtain the primitives of each layer; respectively analyzing rectangular areas of the primitives of each layer, and establishing plane distribution of the primitives of each layer; and according to the sequence of each layer appearing on the OFD page, pushing each layer into a stack in sequence, and establishing a stacking relation of the layers to form the OFD display model.
The generating module 220 is configured to arrange the watermark text on the OFD page according to the attribute of the watermark text and the attribute of the OFD page, and generate a watermark path data set according to the arrangement condition, where the watermark path data set includes all watermark path data that needs to be added on the OFD page.
Specifically, the generating module 220 is specifically configured to load a watermark font file, and extract, word by word, font path data and font width information; sequentially arranging watermark characters along the reading direction from the origin of the first character pattern, wherein the offset of the next watermark character and the previous watermark character in the X direction is the width of the next watermark character, and recording the offset, the line width and the line height in the line to form single-line typesetting data taking the character pattern path as the basic; calculating a transformation matrix of the font path data according to the rotation angle of the watermark characters; according to the width and the height of the OFD page, the line width, the line height and the watermark spacing of the single-line watermarks, the number of watermarks needing to be tiled in the page is calculated, and a watermark path data set is obtained.
And the inserting module 230 is configured to randomly extract watermark path data from the watermark path data set, and insert watermark graphic data corresponding to the watermark path data into a layer of the OFD display model.
Each piece of watermark path data in the watermark path data set has a complete coordinate transformation relation, including offset in watermark lines, watermark line rotation and offset of watermark units relative to pages.
Specifically, the inserting module 230 is specifically configured to randomly generate a watermark start offset of the OFD page, and randomly extract one piece of watermark path data from the watermark path data set; calculating the final display position of a watermark pattern corresponding to watermark path data in the OFD page according to watermark initial offset, watermark line internal offset, watermark line rotation and watermark unit relative page offset in the watermark path data; randomly generating a watermark insertion layer sequence number, and inserting watermark graphic data corresponding to the watermark path data into a layer corresponding to the sequence number.
In this embodiment, the inserting module 230 is specifically configured to perform the following steps:
step A: adding a new layer in the OFD page, and inserting the new layer into the topmost layer of the OFD page;
And (B) step (B): randomly generating a watermark insertion layer sequence number;
Step C: detecting whether the image layer corresponding to the serial number and the image layer on the upper layer of the image layer have the image element of the external matrix intersection of the watermark image corresponding to the watermark path data according to the OFD display model, and if not, executing the step D; otherwise, executing the step E;
step D: inserting watermark graphic data corresponding to the watermark path data into the layer corresponding to the sequence number;
Step E: and (C) adding 1 to the serial number, and returning to the step (C).
According to the embodiment of the application, the OFD display model is built by analyzing the OFD page, and the watermark graphic data is inserted into the image layer of the OFD display model according to the watermark path data, so that the concealment of the watermark can be increased, and an infringer is not easy to position the watermark.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present application.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are to be protected by the present application.
Claims (8)
1. A method of dynamically watermarking comprising the steps of:
Analyzing an OFD page of the open fixed format document, and establishing an OFD display model according to an analysis result;
According to the attribute of the watermark characters and the attribute of the OFD page, arranging the watermark characters on the OFD page, and generating a watermark path data set according to arrangement conditions, wherein the watermark path data set comprises all watermark path data which need to be added on the OFD page;
randomly extracting watermark path data from the watermark path data set, and inserting watermark graphic data corresponding to the watermark path data into a layer of the OFD display model;
Each piece of watermark path data in the watermark path data set has a complete coordinate transformation relation, and the relation comprises watermark line internal offset, watermark line rotation and watermark unit relative page offset;
The step of randomly extracting watermark path data from the watermark path data set and inserting watermark graphic data corresponding to the watermark path data into a layer of the OFD display model specifically comprises the following steps:
randomly generating a watermark initial offset of an OFD page, and randomly extracting watermark path data from the watermark path data set;
Calculating the final display position of a watermark pattern corresponding to watermark path data in the OFD page according to watermark initial offset, watermark line internal offset, watermark line rotation and watermark unit relative page offset in the watermark path data;
Randomly generating a watermark insertion layer sequence number, and inserting watermark graphic data corresponding to the watermark path data into a layer corresponding to the sequence number.
2. The method according to claim 1, wherein the parsing the open fixed format document OFD page and building an OFD display model according to the parsing result specifically includes:
analyzing an OFD page to obtain a plurality of layers of the OFD page;
respectively analyzing a plurality of layers of the OFD page to obtain the primitives of each layer;
Respectively analyzing rectangular areas of the primitives of each layer, and establishing plane distribution of the primitives of each layer;
and according to the sequence of each layer appearing on the OFD page, pushing each layer into a stack in sequence, and establishing a stacking relation of the layers to form the OFD display model.
3. The method according to claim 1, wherein the step of arranging the watermark text on the OFD page according to the attribute of the watermark text and the attribute of the OFD page, and generating the watermark path data set according to the arrangement condition, specifically comprises:
Loading a watermark font file, and extracting font path data and font width information word by word;
Sequentially arranging watermark characters along the reading direction from the origin of the first character pattern, wherein the offset of the next watermark character and the previous watermark character in the X direction is the width of the next watermark character, and recording the offset, the line width and the line height in the line to form single-line typesetting data taking the character pattern path as the basic;
calculating a transformation matrix of the font path data according to the rotation angle of the watermark characters;
according to the width and the height of the OFD page, the line width, the line height and the watermark spacing of the single-line watermarks, the number of watermarks needing to be tiled in the page is calculated, and a watermark path data set is obtained.
4. The method according to claim 1, wherein the inserting watermark graphic data corresponding to the watermark path data into the layer of the OFD display model specifically comprises:
step A: adding a new layer in the OFD page, and inserting the new layer into the topmost layer of the OFD page;
And (B) step (B): randomly generating a watermark insertion layer sequence number;
Step C: detecting whether the image layer corresponding to the serial number and the image layer on the upper layer of the image layer have the image element of the external matrix intersection of the watermark image corresponding to the watermark path data according to the OFD display model, and if not, executing the step D; otherwise, executing the step E;
step D: inserting watermark graphic data corresponding to the watermark path data into the layer corresponding to the sequence number;
Step E: and (C) adding 1 to the serial number, and returning to the step (C).
5. A device for dynamically watermarking, comprising:
The analysis module is used for analyzing the OFD page of the open fixed format document and establishing an OFD display model according to the analysis result;
The generation module is used for arranging the watermark characters on the OFD page according to the attribute of the watermark characters and the attribute of the OFD page, and generating a watermark path data set according to the arrangement condition, wherein the watermark path data set comprises all watermark path data which need to be added on the OFD page;
The inserting module is used for randomly extracting watermark path data from the watermark path data set and inserting watermark graphic data corresponding to the watermark path data into a layer of the OFD display model;
Each piece of watermark path data in the watermark path data set has a complete coordinate transformation relation, and the relation comprises watermark line internal offset, watermark line rotation and watermark unit relative page offset;
The inserting module is specifically configured to randomly generate a watermark initial offset of an OFD page, and randomly extract watermark path data from the watermark path data set; calculating the final display position of a watermark pattern corresponding to watermark path data in the OFD page according to watermark initial offset, watermark line internal offset, watermark line rotation and watermark unit relative page offset in the watermark path data; randomly generating a watermark insertion layer sequence number, and inserting watermark graphic data corresponding to the watermark path data into a layer corresponding to the sequence number.
6. The apparatus of claim 5, wherein the device comprises a plurality of sensors,
The analysis module is specifically configured to analyze an OFD page to obtain multiple layers of the OFD page; respectively analyzing a plurality of layers of the OFD page to obtain the primitives of each layer; respectively analyzing rectangular areas of the primitives of each layer, and establishing plane distribution of the primitives of each layer; and according to the sequence of each layer appearing on the OFD page, pushing each layer into a stack in sequence, and establishing a stacking relation of the layers to form the OFD display model.
7. The apparatus of claim 5, wherein the device comprises a plurality of sensors,
The generating module is specifically used for loading watermark font files and extracting font path data and font width information word by word; sequentially arranging watermark characters along the reading direction from the origin of the first character pattern, wherein the offset of the next watermark character and the previous watermark character in the X direction is the width of the next watermark character, and recording the offset, the line width and the line height in the line to form single-line typesetting data taking the character pattern path as the basic; calculating a transformation matrix of the font path data according to the rotation angle of the watermark characters; according to the width and the height of the OFD page, the line width, the line height and the watermark spacing of the single-line watermarks, the number of watermarks needing to be tiled in the page is calculated, and a watermark path data set is obtained.
8. The device according to claim 5, characterized in that said insertion module is in particular adapted to perform the following steps:
step A: adding a new layer in the OFD page, and inserting the new layer into the topmost layer of the OFD page;
And (B) step (B): randomly generating a watermark insertion layer sequence number;
Step C: detecting whether the image layer corresponding to the serial number and the image layer on the upper layer of the image layer have the image element of the external matrix intersection of the watermark image corresponding to the watermark path data according to the OFD display model, and if not, executing the step D; otherwise, executing the step E;
step D: inserting watermark graphic data corresponding to the watermark path data into the layer corresponding to the sequence number;
Step E: and (C) adding 1 to the serial number, and returning to the step (C).
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