Mobile PDF Editing via Clipping Mask Extraction
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Solution Overview
Problem
The increasing need to view and edit PDF files on mobile terminals with limited screen size poses challenges in extracting and managing relevant information while maintaining security, as existing technologies do not efficiently allow for selective extraction and editing of important parts from PDF files.
Innovation Solution
An apparatus and method for editing PDF files on mobile terminals, which includes a document storage unit, an edited document generation unit that extracts and processes areas of interest using clipping masks, maintains entity attributes, and ensures security by distinguishing between confidential and non-confidential regions, allowing for secure and selective copying of relevant information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PDF files are viewed on mobile terminals with limited screen size, then the ability to view documents on portable devices is improved, but the ability to effectively extract and display only relevant information deteriorates
Solution Approach 1:
The patent segments the PDF document into multiple page images and allows selective extraction of specific pages or regions. The editing space file stores references to specific page ranges, enabling users to compile information from scattered pages into a concentrated edited document, thus adapting to mobile screen limitations while preserving information relevance.
Solution Approach 2:
The patent extracts only the necessary pages or regions from the original PDF file based on user selection. The area-of-interest extraction unit identifies and extracts specific content regions, creating a condensed edited document that contains only relevant information suitable for mobile display, thereby resolving the contradiction between portability and information relevance.
2Reliability
If security features are implemented in PDF files to restrict printing, copying and editing, then security is improved, but the ability to edit and extract information from PDF files deteriorates
Solution Approach 1:
The patent introduces an intermediary editing space file that acts as a bridge between the secured PDF and the user's editing needs. This intermediary structure allows the system to work around security restrictions by creating a new document that references the original content without directly violating its protection, thus maintaining security while enabling extraction and editing capabilities.
Solution Approach 2:
The patent creates a copy of the PDF content in an editing space file format that is more amenable to manipulation. By copying the document structure and content into this intermediate format, the system enables extraction and editing operations while the original secured PDF remains protected, resolving the contradiction between security and editability.
3Loss of information
If the entire PDF file is copied to the edited document, then completeness of information is improved, but the file size and processing time on mobile terminals worsens
Solution Approach 1:
The patent extracts only the specific pages and regions that the user needs from the original PDF file. The area-of-interest extraction unit identifies relevant content areas, and only these extracted portions are incorporated into the edited document, thereby maintaining information completeness for the user's needs while significantly reducing the overall file size and processing requirements for mobile devices.
Data Source
AI summary
An apparatus and method for editing a document are disclosed. The apparatus is installed on a first terminal, that is, a mobile terminal of a user, in order to edit a document of a document file stored in the first terminal. The apparatus includes a document storage unit and an edited document generation unit. The document storage unit stores at least one document file. The edited document generation unit extracts an area of interest from a document file stored in the document storage unit and displayed on a display unit of the first terminal, and generates an edited document. The document file is a portable document format (PDF) file.