Layout-Preserved Text Generation from PDF Input
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Solution Overview
Problem
Conventional methods for extracting text from PDF documents fail to preserve the formatting and layout information, leading to the loss of valuable metadata, particularly in documents like movie scripts that rely on specific formatting standards.
Innovation Solution
A layout-preserved text generation method that transforms PDF (X, Y) document space into a text file grid space, using base width and height values to calculate spacing and newline values, thereby preserving the global document layout view by accurately positioning text elements in the output text document.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional text extraction methods are used on PDF documents, then text can be extracted quickly and easily, but the formatting and layout information is lost
Solution Approach 1:
The PDF document is divided into discrete text elements, each with associated spatial coordinates. By processing and transforming each text element individually based on its position information, the method preserves layout structure while enabling systematic text extraction. This segmentation approach allows the system to maintain formatting information without requiring complex global processing.
Solution Approach 2:
The patent introduces an intermediate representation that maps PDF spatial coordinates to text file grid positions. This intermediary transformation layer converts the continuous coordinate system of PDF into the discrete grid system of text files, enabling layout preservation during the extraction process without direct complex processing between the original and final formats.
2Manufacturing precision
If text elements are extracted with spatial coordinates from PDF, then layout information is preserved, but the transformation to text file format becomes more complex
Solution Approach 1:
The method transforms the coordinate system parameters from PDF's continuous (X, Y) spatial coordinates to text file's discrete grid positions. By changing the parameter representation and applying a systematic transformation formula, the patent achieves accurate layout preservation while maintaining a relatively simple transformation process that can be implemented through straightforward calculations.
3Measurement precision
If base width and height values are calculated from font information, then text positioning accuracy is improved, but additional processing steps are required
Solution Approach 1:
The method performs preliminary calculation of base width and height values from font information before the main text extraction and positioning process. By pre-computing these fundamental parameters, the system establishes a reference scale that accelerates subsequent positioning calculations and improves precision without significantly increasing overall processing time, as the preliminary calculation is performed once rather than repeatedly for each text element.
Data Source
AI summary
Methods and apparatus for generating layout-preserved text output from portable document format (PDF) input are described. A layout-preserved text generation method may generate layout-preserved text output from PDF input that includes the text along with indentations, spaces, newlines, and paging and that thus preserves the global document layout view of the original PDF input document. The layout-preserved text generation method may transform the PDF (X, Y) document space into a text file grid space while preserving a similar global view of the text and layout from the PDF (X, Y) document space. This transformation may include determining a base size per grid that may produce accurate layout in the text output from the PDF input.