Method for converting PDF files to OFD files

Abstract

The invention discloses a method for converting PDF files to OFD files. The method comprises the following steps of: firstly inputting a PDF file; analyzing a layout of the PDF file by utilizing a machine vision technology so as to obtain content distribution of the layout, and analyzing PDF file data to obtain objects of all the elements in the file and object information; mapping the objects with layout distribution, positioning the elements such as characters, pictures, tables and formulas, ad converting PDF-format objects into OFD-format objects by utilizing the mapped object information;and finally composing the OFD-format objects according to an output requirement and outputting an OFD file. According to the method, single or batched PDF files can be automatically converted into OFDfiles via relatively high correctness, the correctness of special elements such as pictures, tables and formulas in the PDF files is effectively ensured, the using difficulty of information stored inthe PDF files is reduced, and the efficiency of converting the PDF files into OFD files is improved.

Description

technical field [0001] The invention belongs to the technical field of computers, and relates to a file conversion method, in particular to a method for converting a PDF file to an OFD file. technical background [0002] The PDF format is one of the most popular file transfer formats currently in the world. It is a technical standard introduced by Adobe in 1993, and it became an international standard in 2008. Its most notable feature is its cross-platform and what you see is what you get when printing. However, there are also problems in PDF technology, such as: the standard system is too large and the technical threshold is high, which is not conducive to the effective dissemination and utilization of information. [0003] my country officially released the OFD national standard in 2016, which can meet the needs of format files such as manageability, controllability, and long-term storage, and realizes functions that are basically consistent with the PDF format. Because ...

AI Technical Summary

Problems solved by technology

However, the existing technology has the following defects: 1) the existing technology can only be aimed at documents that are typesetting strictly according to the PDF standard. When the typesetting of the PDF file does not strictly abide by the standard, the accuracy of this method is low, and problems such as errors and loss of content occur

2) The existing technology generally has certain requirements for the chart format embedded in the PDF file, and the content will be lost for the unsupported picture format

3) The existing technology is difficult to recognize the mathematical publicity in the PDF, and can only treat the mathematical formulas and ordinary texts in the same way, which cannot meet the requirements of different processing of the mathematical formulas

Therefore, there are some deficiencies in the existing PDF format conversion technology, resulting in poor robustness of the program, low success rate and accuracy of conversion

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