CN104462159A - Image conversion method and system based on document page content - Google Patents

Abstract

The image conversion method and system based on document page content of the present invention divides the content of the page document to obtain single-color areas and complex-color areas; Format image and store; convert the page content in the complex color area into a second format image suitable for compression and color complex; in this way, by dividing the document page content from the type, different types of page content are converted into the corresponding format Image, to ensure the display effect of the text and image information in the content of the document page.

Description

Image conversion method and system based on document page content

technical field

The invention relates to the field of information processing, in particular to an image conversion method and system based on document page content.

Background technique

Layout document is an electronic document format with a fixed layout rendering effect, such as a document in PDF or CAJ format. The presentation of a layout document has nothing to do with the device. When reading, printing or printing on various devices, the layout results are consistent. ; Therefore, it can display rich page effects very well, but some corresponding modules are required to parse and display it when reading the layout document, that is, a reader is required, which greatly limits the use of the layout document. Especially in online reading, users cannot be required to install readers or ActiveX plug-ins. Therefore, the content of the layout document can only be directly converted into images for unified display in the form of images.

Layout documents support very rich layout elements, including a large number of pictures and texts, so a single image format cannot provide a good display effect for these layout elements. For example, when using the JPG image format to convert a layout document, because the JPG compression scheme cannot handle areas with few colors or deal with solid color areas well, the display effect of the text part in the layout document will be poor; similarly, using PNG for When a layout document is converted, color sampling is generally performed first, and then lossless compression is performed. In the process of color sampling, in order to reduce the amount of data, a considerable amount of color values will be lost, resulting in the final decompressed image containing rich colors. distortion.

Contents of the invention

Therefore, what the present invention aims to solve is the existing technical problem of distorted display effect caused by converting a layout document into a single image file, and provides an image conversion method and system based on document page content.

In order to solve the problems of the technologies described above, the technical scheme adopted in the present invention is as follows:

An image conversion method based on document page content, comprising the following steps:

Region division: Divide the content of the page document to obtain a single-color region and a complex-color region;

converting the page content within the color-only region into a first format image suitable for compressing the color-only content;

The page content in the color-complex region is converted into a second-format image suitable for compressing the color-complex content.

In the described image conversion method based on document page content, the region division step specifically includes:

Divide the area where the page element is a text type into a single color area;

Divide the area where the page elements are of image type into color complex areas.

In the described image conversion method based on document page content, the region division step specifically includes:

Divide the area where the color value of the page element is less than or equal to 256 into a single color area;

The area with more than 256 color values of page elements is divided into color complex area.

In the above-mentioned image conversion method based on document page content, the area where the page element is located is determined according to the position, size and scaling information of the page element.

According to the image conversion method based on document page content, the image in the first format is a PNG image.

According to the image conversion method based on document page content, the image in the second format is a JPG image.

In the described image conversion method based on document page content, the storage is performed according to the following steps:

storing the positions and sizes of the converted images in the first format and the images in the second format in a fixed-length manner;

storing the data of the converted image in the first format and the image in the second format in an indefinite length manner;

Create index information at the beginning storage position of each image;

A plurality of images in the first format and images in the second format corresponding to the same document page are stored in a data file.

The described image conversion method based on document page content also includes the following steps of browser display:

reading the location of each of the first format image and the second format image from the data file;

Construct dynamic web page information according to the position of each of the first format image and the second format image; read the data of each of the first format image and the second format image and display on the corresponding position of the constructed dynamic web page .

At the same time, an image conversion system based on document page content is provided, including:

The area division module divides the content of the page document to obtain a single color area and a complex color area;

The image conversion module converts the page content in a single color area into a first format image suitable for compressing single color content and stores it; converts the page content in a complex color area into a second format image suitable for compressing color complex content and storage.

In the described image conversion system based on document page content, the region division module specifically includes:

Single-color area division submodule: used to divide the area where the text-type page elements are located into a single-color area;

The color complex area division sub-module: used to divide the area where the page element of the image type is located into a color complex area.

In the described image conversion system based on document page content, the region division module specifically includes:

A single-color area acquisition sub-module, used to divide areas with page element color values less than or equal to 256 into single-color areas;

A submodule for acquiring complex color areas is used to divide areas with more than 256 color values of page elements into complex color areas.

The described image conversion system based on document page content further includes a submodule for determining the area where the page element is located according to the position, size and scaling information of the page element.

In the image conversion system based on document page content, the image in the first format in the image conversion module is a PNG image.

In the image conversion system based on document page content, the image in the second format in the image conversion module is a JPG image.

In the image conversion system based on document page content, the image conversion module specifically includes a storage submodule, and the storage submodule specifically includes:

The first storage submodule is used to store the positions and sizes of the converted images in the first format and the images in the second format in a fixed-length manner;

The second storage sub-module is used to store the data of the converted image in the first format and the image in the second format in a variable-length manner;

An index module, configured to establish index information at the beginning storage position of each image;

The third storage sub-module is configured to store multiple images in the first format and images in the second format corresponding to the same document page in a data file.

The described image conversion system based on document page content also includes a browser display module, and the browser display module specifically includes:

A position reading submodule, configured to read the position of each of the first format image and the second format image from the data file;

A dynamic webpage construction submodule, configured to construct dynamic webpage information according to the positions of each of the images in the first format and the image in the second format;

The display sub-module is used to read the data of each image in the first format and the image in the second format and display it on the corresponding position of the constructed dynamic web page.

The above technical solution of the present invention has the following advantages compared with the prior art:

(1) The image conversion method and system based on document page content of the present invention divides the content of the page document to obtain a single-color area and a complex-color area, and converts the page content in the single-color area into a single-color area suitable for compression The first format image of the content is stored; the page content in the complex color area is converted into a second format image suitable for compressing the complex color content; in this way, by dividing the content of the document page from whether the color is complex, different page content Convert images into corresponding formats to ensure the display effect of text and image information in document page content.

(2) In the image conversion method and system based on document page content of the present invention, the region division is performed according to the metadata information of the document page, specifically, the region division is performed according to whether the type is text or image, which can further simplify the region division Steps to reduce the workload of area division and facilitate implementation.

(3) In the image conversion method and system based on document page content of the present invention, the image in the first format is a PNG image, which can ensure the display effect of the text, and at the same time, can achieve a relatively large compression rate and reduce image data. Storage space and transmission time on the network; taking into account the display effect, the size of the data file and the performance of the conversion.

(3) In the image conversion method and system based on document page content of the present invention, the image in the second format is a JPG image. On the one hand, choosing the JPG format can ensure the display effect of the image, and at the same time, can achieve a relatively large compression rate , greatly reducing the storage space of image data and transmission time on the network; taking into account the display effect, the size of data files and the performance of conversion.

(4) In the image conversion method and system based on document page content of the present invention, the positions and sizes of the converted first-format images and second-format images are stored in a fixed-length manner; the converted first-format images and The data of the image in the second format is stored in an indefinite length manner; index information is established at the beginning storage position of each image; multiple images in the first format and images in the second format corresponding to the same document page are stored in one data in the file. Considering the particularity of different information, the fixed-length method is used to store the determined rule information, and the variable-length method is used to store the variable information, which is convenient and practical; moreover, through the establishment of index information, it provides an efficient way to read graph data; The image is stored in a data file, which is convenient for caching, and also avoids a large number of scattered small files generated by storing an image as a file, which affects the performance of subsequent file reading and may cause file loss.

(5) In the document page content-based image conversion method and system of the present invention, dynamic web page information is constructed according to the position of each of the first-format images and second-format images; each of the first-format images and the second-format images are read The data of the image in the second format is displayed on the corresponding position of the constructed dynamic web page.

Description of drawings

In order to make the content of the present invention more easily understood, the present invention will be described in further detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein

Fig. 1 is a method flowchart of an image conversion method based on document page content according to an embodiment of the present invention;

Fig. 2 is a method flowchart of an image conversion method based on document page content according to another embodiment of the present invention;

Fig. 3 is a schematic diagram of a page of a layout document of the present invention;

FIG. 4 is a schematic diagram of the area converted by using the image conversion method based on document page content in FIG. 3 according to an embodiment of the present invention;

FIG. 5 is a structural block diagram of an image conversion system based on document page content according to an embodiment of the present invention;

FIG. 6 is a structural block diagram of an image conversion system based on document page content according to another embodiment of the present invention.

Detailed ways

Example 1

Referring to Fig. 1, it is a kind of image conversion method based on document page content of an embodiment of the present invention, comprises the following steps:

Region division: Divide the content of the page document to obtain single-color regions and complex-color regions.

The page content in the single-color area is converted into a first-format image suitable for compressing the single-color content and stored. The page content in the complex color area is converted into a second format image suitable for compressing the complex color content and stored.

In the present invention, being suitable for compression refers to being suitable for compressed display, and the display of decompressed content is basically undistorted.

The image conversion method based on the content of the document page in this embodiment divides the content of the page document to obtain a single-color area and a complex-color area, and converts the page content in the single-color area into a first-format image suitable for compressing single-color content And store; convert the page content in the color complex area into a second format image suitable for compressing color complex content and store it; in this way, by dividing the content of the document page from whether the color is complex, different page content is converted into an image of the corresponding format , to ensure the display effect of the text and image information in the content of the document page.

Example 2

Referring to Figure 2, as an image conversion method based on document page content in other embodiments of the present invention, on the basis of Embodiment 1, the region division step specifically includes:

Obtain the metadata information of the document page; the metadata information includes the type, position, size and zoom information of the page element, and the type of the page element includes text (the text in the table is also classified as text type) and image. In this embodiment, the document is a format document. Of course, documents in other formats can also be processed by the image conversion method of the present invention as long as they include necessary metadata information, and the purpose of the present invention can also be achieved.

The type of the page element of the document page is extracted according to the metadata information.

The area of each page element is determined according to the position, size, and scaling information of the page element, that is, the area where the page element is located.

Divide the area where the page element is text type into a single color area; divide the area where the page element is an image type into a color complex area.

In this embodiment, the region division is performed according to the metadata information of the document page, specifically according to whether the type is text or image, which can further simplify the region division steps, reduce the workload of the region division, and facilitate implementation.

Example 3

As an image conversion method based on document page content in other embodiments of the present invention, on the basis of Embodiment 1, the region division step specifically includes:

Obtain the metadata information of the document page; wherein, the metadata information includes the color value, position, size and scaling information of the page elements.

The area of each page element is determined according to the position, size and scaling information of the page element, that is, the area of each page element is determined.

The area where the color value of the page element is less than or equal to 256 is divided into a single color area; the area where the color value of the page element is more than 256 is divided into a complex color area.

Preferably, multiple directly adjacent single-color or complex-color regions can be combined to generate a large single-color or complex-color region, which can reduce the number of compression operations and improve the conversion efficiency of the entire document page.

In this embodiment, the area division is obtained by counting the color values of the page elements in the area. If the color values of the content in the area do not exceed 256, it is determined that the area where the page element is located is a single-color area; otherwise, if the content in the area If the color value exceeds 256, it is judged as a complex color area. The method of counting the color values of the content within the predetermined range to perform regional division and count the color values requires a large amount of work and is relatively cumbersome to operate, but it is more accurate and more versatile.

Example 4

As an image conversion method based on document page content in other embodiments of the present invention, on the basis of any of the above embodiments, the first format image is a PNG image, where the full name of PNG is Portable Network Graphic Format, which means portable Web graphics format. Preferably, the first format image is an 8Bit PNG image. In this way, 8Bit is used to store the sampled color value, and store up to 256 colors, which can achieve a greater compression rate and reduce the amount of data. The image in the first format as another embodiment of the present invention can also be an image in Gif format or Tiff format, which can also implement the module of the present invention to ensure clear display of text, and also has a certain compression rate advantage.

The first format image is a PNG image, which can ensure the display effect of the text, and at the same time, can achieve a large compression rate, reduce the storage space of the image data and the transmission time on the network; taking into account the display effect, the size of the data file and Conversion performance.

Example 5

As another image conversion method based on document page content of the present invention, on the basis of any one of the above embodiments, the second format image is a JPG image. The full name of JPG is JPEG, and its full name is Joint Photographic Experts GROUP. It is an international digital image compression standard, and it is also the most widely used image compression standard that has been in use so far. The JPEG format easily compresses files at a ratio of 10:1 to 20:1 without loss of picture quality. JPEG compression works well for photorealistic photography.

The second format image is a JPG image. On the one hand, choosing the JPG format can ensure the display effect of the image. At the same time, it can achieve a large compression rate, greatly reducing the storage space of image data and the transmission time on the network; taking into account the display effect , the size of the data file, and the performance of the conversion.

Example 6

As an image conversion method based on document page content in other embodiments of the present invention, on the basis of any of the above embodiments, the storage is performed according to the following steps:

storing the positions and sizes of the converted images in the first format and the images in the second format in a fixed-length manner;

storing the data of the converted image in the first format and the image in the second format in an indefinite length manner;

Create index information at the beginning storage position of each image;

Multiple images in the first format and images in the second format corresponding to the same document page are stored in a data file.

Store the position and size of the converted image in the first format and the image in the second format in a fixed-length manner; store the data of the converted image in the first format and the image in the second format in a variable-length manner; at the beginning of each image Index information is established at the stored location; multiple images in the first format and images in the second format corresponding to the same document page are stored in a data file. Considering the particularity of different information, the fixed-length method is used to store the determined rule information, and the variable-length method is used to store the variable information, which is convenient and practical; moreover, through the establishment of index information, it provides an efficient way to read graph data; The image is stored in a data file, which is convenient for caching, and also avoids a large number of scattered small files generated by storing an image as a file, affecting the performance of subsequent file reading, and may cause file loss.

Example 7

As an image conversion method based on document page content in other embodiments of the present invention, on the basis of the above-mentioned embodiment 6, it also includes the following steps of browser display:

reading the position of each first format image and second format image from the data file;

The dynamic webpage information is constructed according to the position of each image in the first format and the image in the second format; the data read from each image in the first format and the image in the second format is displayed on the corresponding position of the constructed dynamic webpage.

The dynamic webpage information is constructed according to the position of each image in the first format and the image in the second format; the data read from each image in the first format and the image in the second format is displayed on the corresponding position of the constructed dynamic webpage.

Example 8

Referring to Fig. 5, it is an image conversion system based on document page content according to an embodiment of the present invention, including:

The area division module divides the content of the page document to obtain a single color area and a complex color area;

The image conversion module converts the page content in a single color area into a first format image suitable for compressing single color content and stores it; converts the page content in a complex color area into a second format image suitable for compressing color complex content and storage.

The image conversion system based on the content of the document page in this embodiment divides the content of the page document to obtain a single-color area and a complex-color area, and converts the page content in the single-color area into a first-format image suitable for compressing single-color content And store; convert the page content in the color complex area into a second format image suitable for compressing color complex content and store it; in this way, by dividing the content of the document page from whether the color is complex, different page content is converted into an image of the corresponding format , to ensure the display effect of the text and image information in the content of the document page.

Example 9

Referring to Figure 6, it is an image conversion system based on document page content according to an embodiment of the present invention. On the basis of Embodiment 8, the area division module specifically includes:

The metadata information obtaining sub-module is used to obtain the metadata information of the document page; wherein, the metadata information includes the type, position, size and zoom information of the page element, and the type of the page element includes text and image.

The area determining submodule is used to determine the area of each page element according to the position, size and scaling information of the page element.

The area division sub-module is used to divide different types of page elements included in the document page into multiple areas according to the area; the area division sub-module specifically includes: a color single area division sub-module and a color complex area division sub-module: wherein, the color is single Area division sub-module: used to divide the area where the page element is text type into a single color area; the color complex area division sub-module is used to divide the area where the page element is image type into color complex area.

In this embodiment, the region is divided according to the metadata information of the document page, specifically according to whether the type is text or image, which can further simplify the steps of region division, reduce the workload of region division, and facilitate implementation.

Example 10

As an image conversion system based on document page content in an embodiment of the present invention, on the basis of Embodiment 8, the area division module specifically includes:

The metadata information obtaining sub-module is used to obtain the metadata information of the document page; wherein, the metadata information includes the color value, position, size and scaling information of the page elements;

The area defining submodule is used to determine the area of each page element according to the position, size and scaling information of the page element;

The area acquisition submodule specifically includes the single color area acquisition submodule and the color complex area acquisition submodule, wherein the single color area acquisition submodule is used to divide the area where the color value of the page element is less than or equal to 256 kinds into a single color area Region; a submodule for acquiring complex color regions, used to divide regions with more than 256 color values of page elements into complex color regions.

In this embodiment, the area division is obtained by counting the color values of the page elements in the area. If the color values of the content in the area do not exceed 256, it is determined that the area where the page element is located is a single-color area; otherwise, if the content in the area If the color value exceeds 256, it is judged as a complex color area. The method of counting the color values of the content within the predetermined range to perform regional division and count the color values requires a large amount of work and is relatively cumbersome to operate, but it is more accurate and more versatile.

Example 11

As an image conversion system based on document page content in other embodiments of the present invention, on the basis of any of the above embodiments, the image in the first format in the image conversion module is a PNG image.

The first format image is a PNG image, which can ensure the display effect of the text, and at the same time, can achieve a large compression rate, reduce the storage space of the image data and the transmission time on the network; taking into account the display effect, the size of the data file and Conversion performance.

Example 12

As an image conversion system based on document page content in other embodiments of the present invention, on the basis of an image conversion system based on document page content in any of the above embodiments, the second format image in the image conversion module is JPG image.

The second format image is a JPG image. On the one hand, choosing the JPG format can ensure the display effect of the image. At the same time, it can achieve a large compression rate, greatly reducing the storage space of image data and the transmission time on the network; taking into account the display effect , the size of the data file, and the performance of the conversion.

Example 13

As an image conversion system based on document page content in other embodiments of the present invention, on the basis of an image conversion system based on document page content in any of the above embodiments, the image conversion module specifically includes a storage sub-module, and the storage sub-module Modules specifically include:

The first storage sub-module is used to store the positions and sizes of the converted images in the first format and the images in the second format in a fixed-length manner.

The second storage sub-module is used to store the converted data of the image in the first format and the image in the second format in a variable-length manner.

The index module is used to establish index information at the beginning storage position of each image.

The third storage sub-module is used for storing multiple images in the first format and images in the second format corresponding to the same document page in a data file.

In this embodiment, the positions and sizes of the converted images in the first format and the images in the second format are stored in a fixed-length manner; the data of the converted images in the first format and the images in the second format are stored in a variable-length manner; Index information is established at the starting storage position of each image; multiple images in the first format and images in the second format corresponding to the same document page are stored in a data file. Considering the particularity of different information, the fixed-length method is used to store the determined rule information, and the variable-length method is used to store the variable information, which is convenient and practical; moreover, through the establishment of index information, it provides an efficient way to read graph data; The image is stored in a data file, which is convenient for caching, and also avoids a large number of scattered small files generated by storing an image as a file, affecting the performance of subsequent file reading, and may cause file loss.

Example 14

As an image conversion system based on document page content in other embodiments of the present invention, on the basis of the above-mentioned embodiment 13, it also includes a browser display submodule, and the browser display submodule specifically includes:

The position reading submodule is used to read the position of each image in the first format and the image in the second format from the data file;

A dynamic webpage construction sub-module, configured to construct dynamic webpage information according to the positions of each image in the first format and the image in the second format;

The display sub-module is used for reading the data of each image in the first format and the image in the second format and displaying it on the corresponding position of the constructed dynamic web page.

The image conversion method and system based on document page content of the present invention will be specifically described below in conjunction with the layout page examples shown in FIGS. 3 and 4 :

Taking the document page shown in Figure 3 as an example, the page is divided into four parts according to different metadata: text part 1, image part 2, text part 3 and text part 4, and each part is finally converted into an image , in which the image part 2 is converted into a PNG image suitable for single color, and the other three parts are converted into JPG images suitable for compressing complex colors. The detailed information of each image is shown in the following table:

serial number coordinate x coordinate y Width high File size 1 0 0 200 300 19,777 2 200 0 155 240 7,487 3 200 240 155 60 5,923 4 355 0 255 300 20,746

Save the four parts of the data split in the above table into a large file as shown in the table below

When reading, according to the amount of image data, the meta information of all images can be read. Specifically, according to the data pointer, the length and start position of the data of each part of the image can be obtained, and then the image data can be read.

Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, systems, or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and combinations of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a Means for realizing the functions specified in one or more steps of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.

Claims (12)

1. an image conversion method based on document page content, is characterized in that, comprises the steps: Region division: Divide the content of the page document to obtain a single-color region and a complex-color region; converting the page content within the color-only region into a first format image suitable for compressing the color-only content; The page content in the color-complex region is converted into a second-format image suitable for compressing the color-complex content. 2. a kind of image conversion method based on document page content according to claim 1, is characterized in that, described area dividing step specifically comprises: Divide the area where the page element is a text type into a single color area; Divide the area where the page elements are of image type into color complex areas. 3. A kind of image conversion method based on document page content according to claim 1, is characterized in that, described region dividing step specifically comprises: Divide the area where the color value of the page element is less than or equal to 256 into a single color area; The area with more than 256 color values of page elements is divided into color complex area. 4. The image conversion method based on document page content according to claim 2 or 3, wherein the area where the page element is located is determined according to the position, size and scaling information of the page element. 5. The image conversion method based on document page content according to any one of claims 1-4, wherein the image in the first format is a PNG image. 6. The image conversion method based on document page content according to any one of claims 1-5, wherein the second format image is a JPG image. 7. A method for image conversion based on document page content according to any one of claims 1-6, wherein the storage is performed according to the following steps: storing the positions and sizes of the converted images in the first format and the images in the second format in a fixed-length manner; storing the data of the converted image in the first format and the image in the second format in an indefinite length manner; Create index information at the beginning storage position of each image; A plurality of images in the first format and images in the second format corresponding to the same document page are stored in a data file. 8. A kind of image conversion method based on document page content according to claim 7, is characterized in that, also comprises the step of following browser display: reading the location of each of the first format image and the second format image from the data file; Constructing dynamic web page information according to the positions of each of the images in the first format and the images in the second format; The read data of each image in the first format and the image in the second format is displayed on the corresponding position of the constructed dynamic web page. 9. An image conversion system based on document page content, comprising: The area division module divides the content of the page document to obtain a single color area and a complex color area; The image conversion module converts the page content in a single color area into a first format image suitable for compressing single color content and stores it; converts the page content in a complex color area into a second format image suitable for compressing color complex content and storage. 10. A kind of image conversion system based on document page content according to claim 9, is characterized in that, described area division module specifically comprises: Single-color area division submodule: used to divide the area where the text-type page elements are located into a single-color area; The color complex area division sub-module: used to divide the area where the page element of the image type is located into a color complex area. 11. A kind of image conversion system based on document page content according to claim 9, it is characterized in that, described area dividing module specifically comprises: A single-color area acquisition sub-module, used to divide areas with page element color values less than or equal to 256 into single-color areas; A submodule for acquiring complex color areas is used to divide areas with more than 256 color values of page elements into complex color areas. 12. A kind of image transformation system based on document page content according to claim 10 or 11, it is characterized in that, also comprises the sub-section that determines the area where described page element is located according to the position, size and scaling information of described page element module.