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Method and device for inputting formula query terms

An input method and query condition technology, which is applied to computer components, character and pattern recognition, instruments, etc., can solve problems such as difficult for users to input formula query conditions, so as to improve retrieval experience and retrieval efficiency, improve usability, and improve The effect of retrieval efficiency

Inactive Publication Date: 2012-09-12
PEKING UNIV
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Problems solved by technology

[0010] In order to solve the problem that it is difficult for users to input formula query conditions in the existing formula retrieval system, the present invention proposes a formula query condition input method of the formula retrieval system based on formula structure analysis, so that the user can directly select the formula area from the digital content, Automatically extract the formula structure as a query condition for formula retrieval

Method used

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  • Method and device for inputting formula query terms
  • Method and device for inputting formula query terms
  • Method and device for inputting formula query terms

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Embodiment 1

[0044] This embodiment introduces a specific implementation process of a method for inputting a mathematical formula query condition for an application scenario in which a mathematical formula in a layout document is input as a query condition into a retrieval system. The format of electronic documents here can be PDF (Portable Document Format), CEB (Chinese E-document Basic), CEBX (Common e-Document of Blending XML), etc. In this embodiment, the formula structure analysis uses a baseline-based formula structure analysis algorithm. The realization of formula structure analysis can also be realized by other structural analysis algorithms, such as: virtual link network (“Yuko Eto and Masakazu Suzuki. Mathematical formula recognition using virtual link network. In Proceedings of the Sixth International Conference on Document Analysis and Recognition (ICDAR01) , 762-767, 2001."), graph grammar ("S. Lavirotte and L. Pottier. Mathematical formula recognition using graph grammar. In ...

Embodiment 2

[0062] This embodiment introduces a specific implementation process of a method for inputting a mathematical formula query condition for an application scenario in which a mathematical formula in an image document is input as a query condition into a retrieval system. Here, the image document may be a scanned document, an image obtained by taking a screenshot of a webpage content, an image or a formula picture obtained by taking a screenshot of a Flash content, and the like. The formula structure analysis adopts the method based on projection contour cutting, referred to as x / y cutting method, to analyze the formula structure.

[0063] The user U's equipment (personal computer, handheld device, etc.) needs to first install the client software that realizes the functions of the present invention. In the process of viewing scanned documents, web pages, Flash or formula pictures, if user U needs to retrieve the formulas therein, he can input query conditions by capturing the form...

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Abstract

The invention discloses a method and a device for inputting query terms. The method comprises the steps of selecting a formula region to be searched in digital content of the existing file through a way for intercepting a screen region by a user; performing format-file symbol recognition if the existing file is the format file; if not, performing the image file symbol recognition; analyzing a layout structure and a logic structure of a formula according to a formula symbol, outputting the analysis results of the layout structure and the logic structure into a structural description file of the formula, and adopting the analysis results as an query input of a formula-type searching engine. Due to the adoption of the method, a formula to be inquired can be simply and conveniently inputted by the user, and an effect for automatically searching the formula according to the formula seen by the user can be realized. The problem in the existing formula-type searching system that the query formula is uneasy to input can be solved, the requirement for the easiness in use of the formula searching input way can be met, and the searching experience and the searching efficiency can be enhanced.

Description

technical field [0001] The invention belongs to the field of document identification and information retrieval, and relates to a formula query condition input method for a formula retrieval system. Background technique [0002] Formulas are an important part of scientific documents and are widely used in education, technology and other fields. The formulas in the document are rich in meaning, contain important information, and are a valuable digital resource. At present, due to the lack of mature and practical formula retrieval technology, this part of knowledge is difficult to be retrieved, and has not been activated, reproduced and utilized for a long time. The realization of formula retrieval can greatly improve the efficiency of retrieval of formula-related content, scientific and technological literature and other information on the one hand, and can also promote the exchange and sharing of information on the other hand. In recent years, the formula retrieval technolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/30G06K9/20
Inventor 林晓燕高良才汤帜邱勤
Owner PEKING UNIV
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