Method and application system for annotating PDF (Portable Document Format) file

Abstract

The invention provides a method and an application system for annotating a PDF (Portable Document Format) file. The application system comprises a PDF file identification module based on tabula secondary development, a file conversion module, a cursor tracking and positioning module, an annotation module and a storage module. The method comprises the steps that the PDF file identification module is used for opening a PDF file online for previewing; the file conversion module is used for converting each page of the PDF file into a picture; when the cursor tracking and positioning module is used for previewing the picture online, selecting a target area in the picture through a mouse, and recording the range of the selected target area; the annotation module is used for popping up an annotation input box and inputting annotation suggestions in the annotation input box; and the storage module is used for storing the coordinates of the frame-selected target area and the corresponding comment opinions. On the basis of a tabula open source technology, each page of the PDF document is converted into a picture, then the pictures are previewed online, a mouse frame selection area is supported, comment opinions are input, and meanwhile comments are added to multiple positions of the frame selection document.

Description

technical field [0001] The invention relates to the technical field of PDF file processing and document online review, in particular to a method and an application system for annotating PDF files. Background technique [0002] In order to prevent the content of the document from being tampered with during the circulation process, the document is usually converted into a document in PDF format, so that others cannot edit the document at will, and misoperation of the document content can also be avoided. However, in the process of viewing and reviewing the PDF document, if there is an adjustment opinion on the content of the PDF document, it is often only possible to create a separate file or submit it by email. [0003] At present, it is impossible to add comments to the content of a document in a way similar to adding comments to Word, and the comments can be saved, so that others can view the comments and adjust the content of the comments during the transfer process, which...

AI Technical Summary

Problems solved by technology

However, in the process of viewing and reviewing PDF documents, if there are adjustments to the contents of the PDF documents, they can only be raised by creating another file or by email.

[0003] At present, it is impossible to add comments to a certain document content like adding comments to Word, and the comments can be saved, so that others can view the comments and adjust the content of the comments during the transfer process.

That is, online review of PDF documents cannot add comments to PDF documents, let alone save comments and make comments available for others to view during document review

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