A method and device for obtaining PDF annotation information

Abstract

The invention provides a method and device for obtaining PDF annotation information. The method can obtain the annotation information from an FDF document, and the annotation information of the PDF document stored in the FDF document can be directly obtained by analyzing the FDF document. Wherein the FDF document data format is a data format type similar to a PDF document structure, the FDF document format is completely compatible with all data types defined by the PDF document format, and the FDF document data format is a data format which can be compatible with most PDF reading products. When data transmission is carried out between different PDF documents, the annotation information is stored in the FDF document similar to the PDF document in data structure, so that the annotation information is more convenient to extract, and the problem of data distortion can be avoided.

Description

technical field [0001] This application relates to the field of information extraction, and in particular, relates to a method and device for obtaining PDF annotation information. Background technique [0002] Annotation information refers to people's views on some content of a PDF document added by a PDF reading tool or in reply to others' views during the reading process. These annotations are of great significance for future reuse. For the same PDF with the same content, different users may give different annotation information. [0003] The security of PDF firstly ensures that the PDF document cannot be edited, at least not easily modified. The original intention of the PDF format design is not for editing. It may not be a big problem for small changes in the PDF file, but for the entire PDF document It is very difficult to modify a block of text or image. Even if you use the relevant tools on the market, you can’t avoid such restrictions. Secondly, you can set permiss...

AI Technical Summary

Problems solved by technology

[0003] The security of PDF firstly ensures that the PDF document cannot be edited, at least not easily modified. The original intention of the PDF format design is not for editing. It may not be a big problem for small changes in the PDF file, but for the entire PDF document It is very difficult to modify a block of text or image. Even if you use the relevant tools on the market, you can’t avoid such restrictions. Secondly, you can set permissions to restrict users’ content printing, content copying, and even the addition, modification or addition of comments or annotations. delete

[0004] Annotations are stored in PDF documents as a relatively independent content block. Due to the above-mentioned characteristics of the PDF format itself, it is not practical to directly use some annotation information, especially it is quite difficult to extract and transmit PDF annotation information. things

[0005] In the existing technology, the extracted PDF annotation information is stored in XML format, and the annotation information in XML format needs to be converted before it can be transmitted between PDF documents, and there will be data distortion during the conversion process

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