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569 results about "Mathematical formula" patented technology

Automatic recognition method pf mathematical formula in image

The invention relates to an automatic recognition method of a mathematical formula in an image, which comprises the steps that: a syntactic structure model of the mathematical formula is built, and a bottom knowledge base of the mathematical formula is built; the location of the mathematical formula in the image, the recognition of a mathematical symbol, the analysis and comprehension of a mathematical formula structure and the expression and formatted output of the mathematical formula structure are carried out. The automatic recognition method designs a complete set of method and model for solving the recognition and comprehension difficulties of an off-line mathematical formula image and forms a method for automatically processing the mathematical formula image in the whole process. The method can realize the automatic judgment and extraction of an individual-line / embedded mathematical formula in an image, thereby meeting the application requirements of the automatic inputting of the mathematical formula image and the comprehension and format recurrence of the mathematical formula structure. The method can be combined with the existing normal text OCR system to form a document image processing system with more complete functions and also can support the research on expression processing methods in other fields, such as automatic processing aiming at chemical equations, etc.
Owner:NANKAI UNIV

Method for analyzing and recognizing structure of handwritten mathematical formula in natural scene image

The invention provides a method for analyzing and recognizing the structure of a handwritten mathematical formula in a natural scene image. The method comprises the steps of S1, converting the gray matrix of a natural scene image into a local contrast matrix, and conducting the binary classification on the local contrast matrix based on the otsu method to obtain a binary matrix; S2, analyzing the connected domains of the binary matrix obtained in the step S1, and removing non-character type connected domains to obtain character type connected domains; S3, detecting formula structural elements and other special structural elements in the character type connected domains based on the correlation coefficient method, and separately marking out all detected special structural elements; S4, dividing the binary matrix obtained in the step S1 based on the horizontal projection method; S5, recognizing each character type connected domain via a convolutional neural network; S6, defining an output sequence and outputting recognized results according to the corresponding sequence in the latex layout format. According to the technical scheme of the invention, by means of the method, the expression problem of elementary mathematical formulas during the OCR recognition process can be effectively solved.
Owner:BEIJING YUNJIANG TECH CO LTD

WEB-based mathematical formula editing system and method

The invention provides a WEB-based mathematical formula editing system, which comprises an edit module, a conversion module, a communication module, a WEB server and an analysis module, wherein the edition module is used for editing a mathematical formula by inputting mathematical symbols in an edit window of a WEB browser, and the mathematical formula is represented by HTML; the conversion module is used for compressing and converting the mathematical formula into a code in a text format; the communication module is used for sending the code of the mathematic formula generated by the conversion module to the WEB server for storage; the WEB server is used for storing the code of the mathematic formula; and the analysis module is used for analyzing the code of the mathematic formula downloaded and reducing the code into the mathematic formula represented by the HTML. The mathematic formula obtained by the analysis module can be transmitted to the edit module, and is used for formula modification. The invention also provides a WEB-based mathematical formula visual editing method. The editing system is operated in the WEB browser, and a computer terminal is not required to be provided with any plug-in, so that the edition and modification of the mathematic formula are more convenient and simple.
Owner:FOSHAN CITY SHUYUAN TECH INFORMATION
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